Fix some warnings under gcc 4.7.

92 files changed, 447 insertions, 426 deletions

diff --git a/src/gui/beingpopup.cpp b/src/gui/beingpopup.cpp
index 98df1ca9a..759d4c245 100644
--- a/src/gui/beingpopup.cpp
+++ b/src/gui/beingpopup.cpp
@@ -130,7 +130,7 @@ void BeingPopup::show(int x, int y, Being *b)
         label4 = label3;
         label3 = label2;
         label2 = label1;
-        label1 = 0;
+        label1 = nullptr;
     }
 
     if (!(b->getGuildName().empty()))
@@ -143,7 +143,7 @@ void BeingPopup::show(int x, int y, Being *b)
     {
         label4 = label3;
         label3 = label2;
-        label2 = 0;
+        label2 = nullptr;
     }
 
     if (b->getPvpRank() > 0)
@@ -154,7 +154,7 @@ void BeingPopup::show(int x, int y, Being *b)
     else
     {
         label4 = label3;
-        label3 = 0;
+        label3 = nullptr;
     }
 
     if (!b->getComment().empty())
@@ -165,7 +165,7 @@ void BeingPopup::show(int x, int y, Being *b)
     }
     else
     {
-        label4 = 0;
+        label4 = nullptr;
     }
 
     int minWidth = mBeingName->getWidth();
diff --git a/src/gui/botcheckerwindow.cpp b/src/gui/botcheckerwindow.cpp
index 88bc65a78..bff9ad31a 100644
--- a/src/gui/botcheckerwindow.cpp
+++ b/src/gui/botcheckerwindow.cpp
@@ -263,7 +263,7 @@ protected:
 
 
 BotCheckerWindow::BotCheckerWindow():
-    Window(_("Bot Checker"), false, 0, "botchecker.xml"),
+    Window(_("Bot Checker"), false, nullptr, "botchecker.xml"),
     mEnabled(false)
 {
     int w = 500;
diff --git a/src/gui/changeemaildialog.cpp b/src/gui/changeemaildialog.cpp
index 384ebf07f..3c412b424 100644
--- a/src/gui/changeemaildialog.cpp
+++ b/src/gui/changeemaildialog.cpp
@@ -45,7 +45,7 @@
 #include "debug.h"
 
 ChangeEmailDialog::ChangeEmailDialog(LoginData *data):
-    Window(_("Change Email Address"), true, 0, "changeemail.xml"),
+    Window(_("Change Email Address"), true, nullptr, "changeemail.xml"),
     mWrongDataNoticeListener(new WrongDataNoticeListener),
     mLoginData(data)
 {
@@ -102,7 +102,7 @@ ChangeEmailDialog::ChangeEmailDialog(LoginData *data):
 ChangeEmailDialog::~ChangeEmailDialog()
 {
     delete mWrongDataNoticeListener;
-    mWrongDataNoticeListener = 0;
+    mWrongDataNoticeListener = nullptr;
 }
 
 void ChangeEmailDialog::action(const gcn::ActionEvent &event)
diff --git a/src/gui/changepassworddialog.cpp b/src/gui/changepassworddialog.cpp
index 7a67279b6..a7ebaebca 100644
--- a/src/gui/changepassworddialog.cpp
+++ b/src/gui/changepassworddialog.cpp
@@ -47,7 +47,7 @@
 #include "debug.h"
 
 ChangePasswordDialog::ChangePasswordDialog(LoginData *data):
-    Window(_("Change Password"), true, 0, "changepassword.xml"),
+    Window(_("Change Password"), true, nullptr, "changepassword.xml"),
     mWrongDataNoticeListener(new WrongDataNoticeListener),
     mLoginData(data)
 {
@@ -82,7 +82,7 @@ ChangePasswordDialog::ChangePasswordDialog(LoginData *data):
 ChangePasswordDialog::~ChangePasswordDialog()
 {
     delete mWrongDataNoticeListener;
-    mWrongDataNoticeListener = 0;
+    mWrongDataNoticeListener = nullptr;
 }
 
 void ChangePasswordDialog::action(const gcn::ActionEvent &event)
diff --git a/src/gui/charcreatedialog.cpp b/src/gui/charcreatedialog.cpp
index efe7e804f..0cde69386 100644
--- a/src/gui/charcreatedialog.cpp
+++ b/src/gui/charcreatedialog.cpp
@@ -63,7 +63,7 @@ CharCreateDialog::CharCreateDialog(CharSelectDialog *parent, int slot):
     setStickyButtonLock(true);
     setSticky(true);
 
-    mPlayer = new Being(0, ActorSprite::PLAYER, mRace, NULL);
+    mPlayer = new Being(0, ActorSprite::PLAYER, mRace, nullptr);
     mPlayer->setGender(GENDER_MALE);
 
     int numberOfHairColors = ColorDB::getHairSize();
diff --git a/src/gui/charselectdialog.cpp b/src/gui/charselectdialog.cpp
index 00cae41e6..93302e0ff 100644
--- a/src/gui/charselectdialog.cpp
+++ b/src/gui/charselectdialog.cpp
@@ -122,14 +122,14 @@ class CharacterDisplay : public Container
 };
 
 CharSelectDialog::CharSelectDialog(LoginData *data):
-    Window(_("Account and Character Management"), false, 0, "char.xml"),
+    Window(_("Account and Character Management"), false, nullptr, "char.xml"),
     mLocked(false),
-    mUnregisterButton(0),
-    mChangeEmailButton(0),
+    mUnregisterButton(nullptr),
+    mChangeEmailButton(nullptr),
     mCharacterEntries(0),
     mLoginData(data),
     mCharHandler(Net::getCharHandler()),
-    mDeleteDialog(0),
+    mDeleteDialog(nullptr),
     mDeleteIndex(-1)
 {
     setCloseButton(false);
@@ -246,7 +246,7 @@ void CharSelectDialog::action(const gcn::ActionEvent &event)
             == LoginDialog::savedPassword)
         {
             attemptCharacterDelete(mDeleteIndex);
-            mDeleteDialog = 0;
+            mDeleteDialog = nullptr;
         }
         else
         {
@@ -313,7 +313,7 @@ void CharSelectDialog::setCharacters(const Net::Characters &characters)
     for (iter = mCharacterEntries.begin(), iter_end = mCharacterEntries.end();
          iter != iter_end; ++iter)
     {
-        (*iter)->setCharacter(0);
+        (*iter)->setCharacter(nullptr);
     }
 
     Net::Characters::const_iterator i, i_end = characters.end();
@@ -399,7 +399,7 @@ bool CharSelectDialog::selectByName(const std::string &name,
 
 
 CharacterDisplay::CharacterDisplay(CharSelectDialog *charSelectDialog):
-    mCharacter(0),
+    mCharacter(nullptr),
     mPlayerBox(new PlayerBox)
 {
     mButton = new Button("wwwwwwwww", "go", charSelectDialog);
@@ -445,7 +445,7 @@ void CharacterDisplay::setCharacter(Net::Character *character)
         return;
 
     mCharacter = character;
-    mPlayerBox->setPlayer(character ? character->dummy : 0);
+    mPlayerBox->setPlayer(character ? character->dummy : nullptr);
     update();
 }
 
diff --git a/src/gui/chatwindow.cpp b/src/gui/chatwindow.cpp
index cdcd02bc3..35b89b839 100644
--- a/src/gui/chatwindow.cpp
+++ b/src/gui/chatwindow.cpp
@@ -149,7 +149,7 @@ public:
 
 
 ChatWindow::ChatWindow():
-    Window(_("Chat"), false, 0, "chat.xml"),
+    Window(_("Chat"), false, nullptr, "chat.xml"),
     mTmpVisible(false),
     mChatHistoryIndex(0)
 {
@@ -222,11 +222,11 @@ ChatWindow::~ChatWindow()
     config.setValue("ReturnToggles", mReturnToggles);
     removeAllWhispers();
     delete mItemLinkHandler;
-    mItemLinkHandler = 0;
+    mItemLinkHandler = nullptr;
     delete mColorPicker;
-    mColorPicker = 0;
+    mColorPicker = nullptr;
     delete mColorListModel;
-    mColorListModel = 0;
+    mColorListModel = nullptr;
 }
 
 void ChatWindow::fillCommands()
@@ -557,13 +557,13 @@ void ChatWindow::ignoreAllWhispers()
         }
 
         delete(iter->second);
-        iter->second = 0;
+        iter->second = nullptr;
     }
 }
 
 void ChatWindow::chatInput(const std::string &message)
 {
-    ChatTab *tab = NULL;
+    ChatTab *tab = nullptr;
     std::string msg = message;
     trim(msg);
 
@@ -939,7 +939,7 @@ void ChatWindow::addWhisper(const std::string &nick,
     if (tempNick.compare(playerName) == 0)
         return;
 
-    ChatTab *tab = 0;
+    ChatTab *tab = nullptr;
     TabMap::const_iterator i = mWhispers.find(tempNick);
 
     if (i != mWhispers.end())
@@ -1006,7 +1006,7 @@ void ChatWindow::addWhisper(const std::string &nick,
         {
             localChatTab->chatLog(nick + " : " + mes, ACT_WHISPER, false);
             if (player_node)
-                player_node->afkRespond(0, nick);
+                player_node->afkRespond(nullptr, nick);
         }
     }
 }
@@ -1014,7 +1014,7 @@ void ChatWindow::addWhisper(const std::string &nick,
 ChatTab *ChatWindow::addWhisperTab(const std::string &nick, bool switchTo)
 {
     if (!player_node)
-        return NULL;
+        return nullptr;
 
     std::string playerName = player_node->getName();
     std::string tempNick = nick;
@@ -1026,7 +1026,7 @@ ChatTab *ChatWindow::addWhisperTab(const std::string &nick, bool switchTo)
     ChatTab *ret;
 
     if (tempNick.compare(playerName) == 0)
-        return NULL;
+        return nullptr;
 
     if (i != mWhispers.end())
     {
@@ -1051,7 +1051,7 @@ ChatTab *ChatWindow::addWhisperTab(const std::string &nick, bool switchTo)
 ChatTab *ChatWindow::getWhisperTab(const std::string &nick) const
 {
     if (!player_node)
-        return NULL;
+        return nullptr;
 
     std::string playerName = player_node->getName();
     std::string tempNick = nick;
@@ -1060,10 +1060,10 @@ ChatTab *ChatWindow::getWhisperTab(const std::string &nick) const
     toLower(tempNick);
 
     TabMap::const_iterator i = mWhispers.find(tempNick);
-    ChatTab *ret = 0;
+    ChatTab *ret = nullptr;
 
     if (tempNick.compare(playerName) == 0)
-        return NULL;
+        return nullptr;
 
     if (i != mWhispers.end())
         ret = i->second;
@@ -1350,8 +1350,8 @@ void ChatWindow::initTradeFilter()
 void ChatWindow::updateOnline(std::set<std::string> &onlinePlayers)
 {
     TabMap::const_iterator iter;
-    const Party *party = 0;
-    const Guild *guild = 0;
+    const Party *party = nullptr;
+    const Guild *guild = nullptr;
     if (player_node)
     {
         party = player_node->getParty();
diff --git a/src/gui/confirmdialog.cpp b/src/gui/confirmdialog.cpp
index f7f81bd2f..298855563 100644
--- a/src/gui/confirmdialog.cpp
+++ b/src/gui/confirmdialog.cpp
@@ -46,7 +46,7 @@ ConfirmDialog::ConfirmDialog(const std::string &title, const std::string &msg,
 
     gcn::Button *yesButton = new Button(_("Yes"), "yes", this);
     gcn::Button *noButton = new Button(_("No"), "no", this);
-    gcn::Button *ignoreButton = NULL;
+    gcn::Button *ignoreButton = nullptr;
 
     if (ignore)
         ignoreButton = new Button(_("Ignore"), "ignore", this);
diff --git a/src/gui/confirmdialog.h b/src/gui/confirmdialog.h
index 214aaba60..2b5febed0 100644
--- a/src/gui/confirmdialog.h
+++ b/src/gui/confirmdialog.h
@@ -23,6 +23,8 @@
 #ifndef OPTION_DIALOG_H
 #define OPTION_DIALOG_H
 
+#include "localconsts.h"
+
 #include "gui/widgets/window.h"
 
 #include <guichan/actionlistener.hpp>
@@ -44,7 +46,7 @@ class ConfirmDialog : public Window, public gcn::ActionListener
          */
         ConfirmDialog(const std::string &title, const std::string &msg,
                       bool ignore = false, bool modal = false,
-                      Window *parent = NULL);
+                      Window *parent = nullptr);
 
         /**
          * Called when receiving actions from the widgets.
diff --git a/src/gui/debugwindow.cpp b/src/gui/debugwindow.cpp
index 83e9791ef..56a63c72d 100644
--- a/src/gui/debugwindow.cpp
+++ b/src/gui/debugwindow.cpp
@@ -51,7 +51,7 @@
 #include "debug.h"
 
 DebugWindow::DebugWindow():
-    Window(_("Debug"), false, 0, "debug.xml")
+    Window(_("Debug"), false, nullptr, "debug.xml")
 {
     setWindowName("Debug");
     if (setupWindow)
@@ -85,11 +85,11 @@ DebugWindow::DebugWindow():
 DebugWindow::~DebugWindow()
 {
     delete mMapWidget;
-    mMapWidget = 0;
+    mMapWidget = nullptr;
     delete mTargetWidget;
-    mTargetWidget = 0;
+    mTargetWidget = nullptr;
     delete mNetWidget;
-    mNetWidget = 0;
+    mNetWidget = nullptr;
 }
 
 void DebugWindow::logic()
@@ -139,7 +139,7 @@ void DebugWindow::widgetResized(const gcn::Event &event)
 }
 
 MapDebugTab::MapDebugTab() :
-    mTexturesLabel(0)
+    mTexturesLabel(nullptr)
 {
     LayoutHelper h(this);
     ContainerPlacer place = h.getPlacer(0, 0);
diff --git a/src/gui/didyouknowwindow.cpp b/src/gui/didyouknowwindow.cpp
index df15e6ebd..9a913a305 100644
--- a/src/gui/didyouknowwindow.cpp
+++ b/src/gui/didyouknowwindow.cpp
@@ -44,7 +44,7 @@ static const int minTip = 1;
 static const int maxTip = 14;
 
 DidYouKnowWindow::DidYouKnowWindow():
-    Window(_("Did You Know?"), false, 0, "didyouknow.xml")
+    Window(_("Did You Know?"), false, nullptr, "didyouknow.xml")
 {
     setMinWidth(300);
     setMinHeight(250);
diff --git a/src/gui/editdialog.h b/src/gui/editdialog.h
index dc0d1cc63..69f86edca 100644
--- a/src/gui/editdialog.h
+++ b/src/gui/editdialog.h
@@ -24,6 +24,8 @@
 #ifndef EDIT_DIALOG_H
 #define EDIT_DIALOG_H
 
+#include "localconsts.h"
+
 #include "gui/widgets/window.h"
 #include "gui/widgets/textfield.h"
 
@@ -48,7 +50,7 @@ class EditDialog : public Window, public gcn::ActionListener
          */
         EditDialog(const std::string &title, const std::string &msg,
                    std::string eventOk = ACTION_EDIT_OK, int width = 300,
-                   Window *parent = NULL, bool modal = true);
+                   Window *parent = nullptr, bool modal = true);
 
         /**
          * Called when receiving actions from the widgets.
diff --git a/src/gui/emotepopup.cpp b/src/gui/emotepopup.cpp
index 6d2bf7be2..a8c92ed47 100644
--- a/src/gui/emotepopup.cpp
+++ b/src/gui/emotepopup.cpp
@@ -80,7 +80,7 @@ EmotePopup::~EmotePopup()
     if (mSelectionImage)
     {
         mSelectionImage->decRef();
-        mSelectionImage = 0;
+        mSelectionImage = nullptr;
     }
 }
 
diff --git a/src/gui/equipmentwindow.cpp b/src/gui/equipmentwindow.cpp
index f423cddf0..d3d230922 100644
--- a/src/gui/equipmentwindow.cpp
+++ b/src/gui/equipmentwindow.cpp
@@ -58,7 +58,7 @@ static const int BOX_HEIGHT = 36;
 
 EquipmentWindow::EquipmentWindow(Equipment *equipment, Being *being,
                                  bool foring):
-    Window(_("Equipment"), false, 0, "equipment.xml"),
+    Window(_("Equipment"), false, nullptr, "equipment.xml"),
     mEquipment(equipment),
     mSelected(-1),
     mForing(foring)
@@ -86,7 +86,7 @@ EquipmentWindow::EquipmentWindow(Equipment *equipment, Being *being,
 
     mBoxes.reserve(13);
     for (int f = 0; f < 13; f ++)
-        mBoxes.push_back(0);
+        mBoxes.push_back(nullptr);
 
     fillBoxes();
 
@@ -109,13 +109,13 @@ EquipmentWindow::EquipmentWindow(Equipment *equipment, Being *being,
 EquipmentWindow::~EquipmentWindow()
 {
     delete mItemPopup;
-    mItemPopup = 0;
+    mItemPopup = nullptr;
     if (this == beingEquipmentWindow)
     {
         if (mEquipment)
             delete mEquipment->getBackend();
         delete mEquipment;
-        mEquipment = 0;
+        mEquipment = nullptr;
     }
     delete_all(mBoxes);
     mBoxes.clear();
@@ -198,7 +198,7 @@ void EquipmentWindow::action(const gcn::ActionEvent &event)
 Item *EquipmentWindow::getItem(int x, int y) const
 {
     if (!mEquipment)
-        return 0;
+        return nullptr;
 
     std::vector<std::pair<int, int>*>::const_iterator it;
     std::vector<std::pair<int, int>*>::const_iterator it_end = mBoxes.end();
@@ -215,7 +215,7 @@ Item *EquipmentWindow::getItem(int x, int y) const
         if (tRect.isPointInRect(x, y))
             return mEquipment->getEquipment(i);
     }
-    return NULL;
+    return nullptr;
 }
 
 void EquipmentWindow::mousePressed(gcn::MouseEvent& mouseEvent)
@@ -322,7 +322,7 @@ void EquipmentWindow::setBeing(Being *being)
     delete mEquipment;
     if (!being)
     {
-        mEquipment = 0;
+        mEquipment = nullptr;
         return;
     }
     mEquipment = being->getEquipment();
@@ -337,7 +337,7 @@ void EquipmentWindow::updateBeing(Being *being)
 void EquipmentWindow::resetBeing(Being *being)
 {
     if (being == mBeing)
-        setBeing(0);
+        setBeing(nullptr);
 }
 
 void EquipmentWindow::fillBoxes()
diff --git a/src/gui/focushandler.cpp b/src/gui/focushandler.cpp
index ec854cf87..40fa2f4ed 100644
--- a/src/gui/focushandler.cpp
+++ b/src/gui/focushandler.cpp
@@ -34,7 +34,7 @@ void FocusHandler::requestModalFocus(gcn::Widget *widget)
     if (mModalFocusedWidget && mModalFocusedWidget != widget)
     {
         mModalStack.push_front(mModalFocusedWidget);
-        mModalFocusedWidget = NULL;
+        mModalFocusedWidget = nullptr;
     }
 
     gcn::FocusHandler::requestModalFocus(widget);
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 658d65769..b3154fb25 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -48,11 +48,11 @@
 #include "debug.h"
 
 // Guichan stuff
-Gui *gui = 0;
-SDLInput *guiInput = 0;
+Gui *gui = nullptr;
+SDLInput *guiInput = nullptr;
 
 // Bolded font
-gcn::Font *boldFont = 0;
+gcn::Font *boldFont = nullptr;
 
 class GuiConfigListener : public ConfigListener
 {
@@ -75,7 +75,7 @@ class GuiConfigListener : public ConfigListener
 
 Gui::Gui(Graphics *graphics):
     mCustomCursor(false),
-    mMouseCursors(NULL),
+    mMouseCursors(nullptr),
     mMouseCursorAlpha(1.0f),
     mMouseInactivityTimer(0),
     mCursorType(CURSOR_POINTER)
@@ -205,28 +205,28 @@ Gui::~Gui()
 {
     config.removeListener("customcursor", mConfigListener);
     delete mConfigListener;
-    mConfigListener = 0;
+    mConfigListener = nullptr;
 
     if (mMouseCursors)
     {
         mMouseCursors->decRef();
-        mMouseCursors = 0;
+        mMouseCursors = nullptr;
     }
 
     delete mGuiFont;
-    mGuiFont = 0;
+    mGuiFont = nullptr;
     delete boldFont;
-    boldFont = 0;
+    boldFont = nullptr;
     delete mHelpFont;
-    mHelpFont = 0;
+    mHelpFont = nullptr;
     delete mSecureFont;
-    mSecureFont = 0;
+    mSecureFont = nullptr;
     delete mInfoParticleFont;
-    mInfoParticleFont = 0;
+    mInfoParticleFont = nullptr;
     delete getTop();
 
     delete guiInput;
-    guiInput = 0;
+    guiInput = nullptr;
 
     Theme::deleteInstance();
 }
@@ -306,7 +306,7 @@ void Gui::setUseCustomCursor(bool customCursor)
             if (mMouseCursors)
             {
                 mMouseCursors->decRef();
-                mMouseCursors = NULL;
+                mMouseCursors = nullptr;
             }
         }
     }
@@ -357,13 +357,13 @@ void Gui::distributeMouseEvent(gcn::Widget* source, int type, int button,
     gcn::Widget* parent = source;
     gcn::Widget* widget = source;
 
-    if (!force && mFocusHandler->getModalFocused() != NULL
+    if (!force && mFocusHandler->getModalFocused() != nullptr
         && !widget->isModalFocused())
     {
         return;
     }
 
-    if (!force && mFocusHandler->getModalMouseInputFocused() != NULL
+    if (!force && mFocusHandler->getModalMouseInputFocused() != nullptr
         && !widget->isModalMouseInputFocused())
     {
         return;
@@ -373,7 +373,7 @@ void Gui::distributeMouseEvent(gcn::Widget* source, int type, int button,
         mAltPressed, mMetaPressed, type, button,
         x, y, mClickCount);
 
-    while (parent != NULL)
+    while (parent)
     {
         // If the widget has been removed due to input
         // cancel the distribution.
@@ -443,7 +443,7 @@ void Gui::distributeMouseEvent(gcn::Widget* source, int type, int button,
 
         // If a non modal focused widget has been reach
         // and we have modal focus cancel the distribution.
-        if (mFocusHandler->getModalFocused() != NULL
+        if (mFocusHandler->getModalFocused()
             && !widget->isModalFocused())
         {
             break;
@@ -451,7 +451,7 @@ void Gui::distributeMouseEvent(gcn::Widget* source, int type, int button,
 
         // If a non modal mouse input focused widget has been reach
         // and we have modal mouse input focus cancel the distribution.
-        if (mFocusHandler->getModalMouseInputFocused() != NULL
+        if (mFocusHandler->getModalMouseInputFocused()
             && !widget->isModalMouseInputFocused())
         {
             break;
diff --git a/src/gui/helpwindow.cpp b/src/gui/helpwindow.cpp
index 019baf503..49f309bca 100644
--- a/src/gui/helpwindow.cpp
+++ b/src/gui/helpwindow.cpp
@@ -40,7 +40,7 @@
 #include "debug.h"
 
 HelpWindow::HelpWindow():
-    Window(_("Help"), false, 0, "help.xml")
+    Window(_("Help"), false, nullptr, "help.xml")
 {
     setMinWidth(300);
     setMinHeight(250);
diff --git a/src/gui/inventorywindow.cpp b/src/gui/inventorywindow.cpp
index f52151698..8ffebebff 100644
--- a/src/gui/inventorywindow.cpp
+++ b/src/gui/inventorywindow.cpp
@@ -96,7 +96,7 @@ public:
 InventoryWindow::WindowList InventoryWindow::instances;
 
 InventoryWindow::InventoryWindow(Inventory *inventory):
-    Window("Inventory", false, 0, "inventory.xml"),
+    Window("Inventory", false, nullptr, "inventory.xml"),
     mInventory(inventory),
     mDropButton(0),
     mSplit(false),
@@ -238,7 +238,7 @@ InventoryWindow::InventoryWindow(Inventory *inventory):
     loadWindowState();
     slotsChanged(mInventory);
 
-    widgetResized(0);
+    widgetResized(nullptr);
     if (!isMainInventory())
         setVisible(true);
 }
@@ -250,7 +250,7 @@ InventoryWindow::~InventoryWindow()
     if (!instances.empty())
         instances.front()->updateDropButton();
     delete mSortModel;
-    mSortModel = 0;
+    mSortModel = nullptr;
 }
 
 void InventoryWindow::action(const gcn::ActionEvent &event)
@@ -644,7 +644,7 @@ void InventoryWindow::updateDropButton()
     }
     else
     {
-        Item *item = 0;
+        Item *item = nullptr;
         if (mItems)
             item = mItems->getSelectedItem();
 
diff --git a/src/gui/itemamountwindow.cpp b/src/gui/itemamountwindow.cpp
index 7c5b19415..a80434ac0 100644
--- a/src/gui/itemamountwindow.cpp
+++ b/src/gui/itemamountwindow.cpp
@@ -138,13 +138,13 @@ void ItemAmountWindow::finish(Item *item, int amount, int price, Usage usage)
 ItemAmountWindow::ItemAmountWindow(Usage usage, Window *parent, Item *item,
                                    int maxRange):
     Window("", true, parent, "amount.xml"),
-    mItemPriceTextField(0),
-    mGPLabel(0),
+    mItemPriceTextField(nullptr),
+    mGPLabel(nullptr),
     mItem(item),
     mMax(maxRange),
     mUsage(usage),
-    mItemPriceSlide(0),
-    mItemsModal(0),
+    mItemPriceSlide(nullptr),
+    mItemsModal(nullptr),
     mPrice(0)
 {
     if (!mItem)
@@ -293,7 +293,7 @@ ItemAmountWindow::ItemAmountWindow(Usage usage, Window *parent, Item *item,
 ItemAmountWindow::~ItemAmountWindow()
 {
     delete mItemPopup;
-    mItemPopup = 0;
+    mItemPopup = nullptr;
 }
 
 // Show ItemTooltip
diff --git a/src/gui/itempopup.cpp b/src/gui/itempopup.cpp
index b05d7fe28..2e87cd544 100644
--- a/src/gui/itempopup.cpp
+++ b/src/gui/itempopup.cpp
@@ -50,7 +50,7 @@
 
 ItemPopup::ItemPopup():
     Popup("ItemPopup", "itempopup.xml"),
-    mIcon(0),
+    mIcon(nullptr),
     mLastName(""),
     mLastColor(1)
 {
@@ -76,7 +76,7 @@ ItemPopup::ItemPopup():
     mItemWeight->setEditable(false);
     mItemWeight->setPosition(getPadding(), 3 * fontHeight + 4 * getPadding());
 
-    mIcon = new Icon(0);
+    mIcon = new Icon(nullptr);
 
     add(mItemName);
     add(mItemDesc);
@@ -95,7 +95,7 @@ ItemPopup::~ItemPopup()
         if (image)
         {
             image->decRef();
-            image = 0;
+            image = nullptr;
         }
     }
 }
@@ -164,7 +164,7 @@ void ItemPopup::setItem(const ItemInfo &item, unsigned char color,
     }
     else
     {
-        mIcon->setImage(0);
+        mIcon->setImage(nullptr);
     }
 
     mItemType = item.getType();
diff --git a/src/gui/killstats.cpp b/src/gui/killstats.cpp
index 4bcab0a09..fa6241ef6 100644
--- a/src/gui/killstats.cpp
+++ b/src/gui/killstats.cpp
@@ -43,7 +43,7 @@
 #include "debug.h"
 
 KillStats::KillStats():
-    Window(_("Kill stats"), false, 0, "killstats.xml"),
+    Window(_("Kill stats"), false, nullptr, "killstats.xml"),
     mKillCounter(0), mExpCounter(0),
     mKillTCounter(0), mExpTCounter(0), mKillTimer(0),
     m1minExpTime(0), m1minExpNum(0), m1minSpeed(0),
diff --git a/src/gui/logindialog.cpp b/src/gui/logindialog.cpp
index 136a01b37..86b3dc28b 100644
--- a/src/gui/logindialog.cpp
+++ b/src/gui/logindialog.cpp
@@ -83,7 +83,7 @@ public:
 
 LoginDialog::LoginDialog(LoginData *data, std::string serverName,
                          std::string *updateHost):
-    Window(_("Login"), false, 0, "login.xml"),
+    Window(_("Login"), false, nullptr, "login.xml"),
     mLoginData(data),
     mUpdateHost(updateHost),
     mServerName(serverName)
@@ -166,7 +166,7 @@ LoginDialog::LoginDialog(LoginData *data, std::string serverName,
 LoginDialog::~LoginDialog()
 {
     delete mUpdateTypeModel;
-    mUpdateTypeModel = 0;
+    mUpdateTypeModel = nullptr;
 }
 
 void LoginDialog::action(const gcn::ActionEvent &event)
@@ -226,9 +226,9 @@ void LoginDialog::keyPressed(gcn::KeyEvent &keyEvent)
     gcn::Key key = keyEvent.getKey();
 
     if (key.getValue() == Key::ESCAPE)
-        action(gcn::ActionEvent(NULL, mServerButton->getActionEventId()));
+        action(gcn::ActionEvent(nullptr, mServerButton->getActionEventId()));
     else if (key.getValue() == Key::ENTER)
-        action(gcn::ActionEvent(NULL, mLoginButton->getActionEventId()));
+        action(gcn::ActionEvent(nullptr, mLoginButton->getActionEventId()));
     else
         mLoginButton->setEnabled(canSubmit());
 }
diff --git a/src/gui/minimap.cpp b/src/gui/minimap.cpp
index e42f12336..d890a462f 100644
--- a/src/gui/minimap.cpp
+++ b/src/gui/minimap.cpp
@@ -47,8 +47,8 @@
 bool Minimap::mShow = true;
 
 Minimap::Minimap():
-    Window(_("Map"), false, 0, "map.xml"),
-    mMapImage(0),
+    Window(_("Map"), false, nullptr, "map.xml"),
+    mMapImage(nullptr),
     mWidthProportion(0.5),
     mHeightProportion(0.5),
     mCustomMapImage(false),
@@ -83,7 +83,7 @@ Minimap::~Minimap()
             delete mMapImage;
         else
             mMapImage->decRef();
-        mMapImage = 0;
+        mMapImage = nullptr;
     }
 }
 
@@ -107,7 +107,7 @@ void Minimap::setMap(Map *map)
             delete mMapImage;
         else
             mMapImage->decRef();
-        mMapImage = 0;
+        mMapImage = nullptr;
     }
 
     if (map)
diff --git a/src/gui/ministatuswindow.cpp b/src/gui/ministatuswindow.cpp
index d307dfed0..665d2b61b 100644
--- a/src/gui/ministatuswindow.cpp
+++ b/src/gui/ministatuswindow.cpp
@@ -67,7 +67,7 @@ MiniStatusWindow::MiniStatusWindow():
     }
     else
     {
-        mMpBar = 0;
+        mMpBar = nullptr;
     }
 
     int job = Net::getPlayerHandler()->getJobLocation()
@@ -85,7 +85,7 @@ MiniStatusWindow::MiniStatusWindow():
     }
     else
     {
-        mJobBar = 0;
+        mJobBar = nullptr;
     }
 
     mWeightBar = createBar(0, 140, 20, Theme::PROG_WEIGHT,
@@ -124,9 +124,9 @@ MiniStatusWindow::MiniStatusWindow():
 MiniStatusWindow::~MiniStatusWindow()
 {
     delete mTextPopup;
-    mTextPopup = 0;
+    mTextPopup = nullptr;
     delete mStatusPopup;
-    mStatusPopup = 0;
+    mStatusPopup = nullptr;
     delete_all(mIcons);
     mIcons.clear();
 
@@ -161,7 +161,7 @@ void MiniStatusWindow::updateBars()
 {
     int x = 0;
     std::vector <ProgressBar*>::const_iterator it, it_end;
-    ProgressBar* lastBar = 0;
+    ProgressBar* lastBar = nullptr;
     for (it = mBars.begin(), it_end = mBars.end(); it != it_end; ++it)
         safeRemove(*it);
     for (it = mBars.begin(), it_end = mBars.end(); it != it_end; ++it)
diff --git a/src/gui/npcdialog.cpp b/src/gui/npcdialog.cpp
index b926d260e..66a30c8a7 100644
--- a/src/gui/npcdialog.cpp
+++ b/src/gui/npcdialog.cpp
@@ -55,14 +55,14 @@
 
 NpcDialog::DialogList NpcDialog::instances;
 
-NpcDialog::NpcDialog(int npcId)
-    : Window(_("NPC"), false, 0, "npc.xml"),
-      mNpcId(npcId),
-      mLogInteraction(config.getBoolValue("logNpcInGui")),
-      mDefaultInt(0),
-      mInputState(NPC_INPUT_NONE),
-      mActionState(NPC_ACTION_WAIT),
-      mLastNextTime(0)
+NpcDialog::NpcDialog(int npcId) :
+    Window(_("NPC"), false, nullptr, "npc.xml"),
+    mNpcId(npcId),
+    mLogInteraction(config.getBoolValue("logNpcInGui")),
+    mDefaultInt(0),
+    mInputState(NPC_INPUT_NONE),
+    mActionState(NPC_ACTION_WAIT),
+    mLastNextTime(0)
 {
     // Basic Window Setup
     setWindowName("NpcText");
@@ -143,32 +143,32 @@ NpcDialog::~NpcDialog()
     clearLayout();
 
     delete mTextBox;
-    mTextBox = 0;
+    mTextBox = nullptr;
     delete mClearButton;
-    mClearButton = 0;
+    mClearButton = nullptr;
     delete mButton;
-    mButton = 0;
+    mButton = nullptr;
 
     // These might not actually be in the layout, so lets be safe
     delete mScrollArea;
-    mScrollArea = 0;
+    mScrollArea = nullptr;
     delete mItemList;
-    mItemList = 0;
+    mItemList = nullptr;
     delete mTextField;
-    mTextField = 0;
+    mTextField = nullptr;
     delete mIntField;
-    mIntField = 0;
+    mIntField = nullptr;
     delete mResetButton;
-    mResetButton = 0;
+    mResetButton = nullptr;
     delete mPlusButton;
-    mPlusButton = 0;
+    mPlusButton = nullptr;
     delete mMinusButton;
-    mMinusButton = 0;
+    mMinusButton = nullptr;
     delete mItemLinkHandler;
-    mItemLinkHandler = 0;
+    mItemLinkHandler = nullptr;
 
     delete mListScrollArea;
-    mListScrollArea = 0;
+    mListScrollArea = nullptr;
 
     instances.remove(this);
 }
@@ -432,7 +432,7 @@ NpcDialog *NpcDialog::getActive()
             return (*it);
     }
 
-    return 0;
+    return nullptr;
 }
 
 void NpcDialog::closeAll()
diff --git a/src/gui/npcpostdialog.cpp b/src/gui/npcpostdialog.cpp
index 67fc57ba9..ada48e832 100644
--- a/src/gui/npcpostdialog.cpp
+++ b/src/gui/npcpostdialog.cpp
@@ -39,7 +39,7 @@
 NpcPostDialog::DialogList NpcPostDialog::instances;
 
 NpcPostDialog::NpcPostDialog(int npcId):
-    Window(_("NPC"), false, 0, "npcpost.xml"),
+    Window(_("NPC"), false, nullptr, "npcpost.xml"),
     mNpcId(npcId)
 {
     setContentSize(400, 180);
diff --git a/src/gui/okdialog.h b/src/gui/okdialog.h
index 2ee8653ec..2f32d0d65 100644
--- a/src/gui/okdialog.h
+++ b/src/gui/okdialog.h
@@ -23,6 +23,8 @@
 #ifndef OK_DIALOG_H
 #define OK_DIALOG_H
 
+#include "localconsts.h"
+
 #include "gui/widgets/window.h"
 
 #include <guichan/actionlistener.hpp>
@@ -44,7 +46,7 @@ class OkDialog : public Window, public gcn::ActionListener
          */
         OkDialog(const std::string &title, const std::string &msg,
                  bool modal = true, bool showCenter = true,
-                 Window *parent = NULL);
+                 Window *parent = nullptr);
 
         /**
          * Called when receiving actions from the widgets.
diff --git a/src/gui/outfitwindow.cpp b/src/gui/outfitwindow.cpp
index 8e0791af1..c33c753bc 100644
--- a/src/gui/outfitwindow.cpp
+++ b/src/gui/outfitwindow.cpp
@@ -57,13 +57,13 @@
 float OutfitWindow::mAlpha = 1.0;
 
 OutfitWindow::OutfitWindow():
-    Window(_("Outfits"), false, 0, "outfits.xml"),
+    Window(_("Outfits"), false, nullptr, "outfits.xml"),
     mBoxWidth(33),
     mBoxHeight(33),
     mGridWidth(4),
     mGridHeight(3),
     mItemClicked(false),
-    mItemMoved(NULL),
+    mItemMoved(nullptr),
     mItemSelected(-1),
     mItemColorSelected(1),
     mCurrentOutfit(0),
@@ -383,7 +383,7 @@ void OutfitWindow::mouseDragged(gcn::MouseEvent &event)
                 if (item)
                     mItemMoved = item;
                 else
-                    mItemMoved = 0;
+                    mItemMoved = nullptr;
                 mItems[mCurrentOutfit][index] = -1;
             }
         }
@@ -433,7 +433,7 @@ void OutfitWindow::mouseReleased(gcn::MouseEvent &event)
         const int index = getIndexFromGrid(event.getX(), event.getY());
         if (index == -1)
         {
-            mItemMoved = NULL;
+            mItemMoved = nullptr;
             Window::mouseReleased(event);
             return;
         }
@@ -443,7 +443,7 @@ void OutfitWindow::mouseReleased(gcn::MouseEvent &event)
         {
             mItems[mCurrentOutfit][index] = mItemMoved->getId();
             mItemColors[mCurrentOutfit][index] = mItemMoved->getColor();
-            mItemMoved = NULL;
+            mItemMoved = nullptr;
         }
         if (mItemClicked)
             mItemClicked = false;
diff --git a/src/gui/popupmenu.cpp b/src/gui/popupmenu.cpp
index a457573ce..b133f66fc 100644
--- a/src/gui/popupmenu.cpp
+++ b/src/gui/popupmenu.cpp
@@ -85,15 +85,15 @@ std::string tradePartnerName("");
 PopupMenu::PopupMenu():
     Popup("PopupMenu", "popupmenu.xml"),
     mBeingId(0),
-    mFloorItem(0),
-    mItem(0),
+    mFloorItem(nullptr),
+    mItem(nullptr),
     mItemId(0),
     mItemColor(1),
-    mMapItem(0),
-    mTab(0),
-    mSpell(0),
-    mDialog(0),
-    mButton(0),
+    mMapItem(nullptr),
+    mTab(nullptr),
+    mSpell(nullptr),
+    mDialog(nullptr),
+    mButton(nullptr),
     mNick(""),
     mType(Being::UNKNOWN)
 {
@@ -102,10 +102,10 @@ PopupMenu::PopupMenu():
     mBrowserBox->setHighlightMode(BrowserBox::BACKGROUND);
     mBrowserBox->setOpaque(false);
     mBrowserBox->setLinkHandler(this);
-    mRenameListener.setMapItem(0);
-    mRenameListener.setDialog(0);
+    mRenameListener.setMapItem(nullptr);
+    mRenameListener.setDialog(nullptr);
     mPlayerListener.setNick("");
-    mPlayerListener.setDialog(0);
+    mPlayerListener.setDialog(nullptr);
     mPlayerListener.setType(Being::UNKNOWN);
 
     add(mBrowserBox);
@@ -833,9 +833,9 @@ void PopupMenu::showChangePos(int x, int y)
     else
     {
         mBeingId = 0;
-        mFloorItem = 0;
-        mItem = 0;
-        mMapItem = 0;
+        mFloorItem = nullptr;
+        mItem = nullptr;
+        mMapItem = nullptr;
         mNick = "";
         mType = Being::UNKNOWN;
         setVisible(false);
@@ -1683,11 +1683,11 @@ void PopupMenu::handleLink(const std::string &link,
     setVisible(false);
 
     mBeingId = 0;
-    mFloorItem = 0;
-    mItem = 0;
+    mFloorItem = nullptr;
+    mItem = nullptr;
     mItemId = 0;
     mItemColor = 1;
-    mMapItem = 0;
+    mMapItem = nullptr;
     mNick = "";
     mType = Being::UNKNOWN;
 }
@@ -1790,7 +1790,7 @@ void PopupMenu::showItemPopup(int x, int y, int itemId, unsigned char color)
     }
     else
     {
-        mItem = 0;
+        mItem = nullptr;
         mItemId = itemId;
         mItemColor = color;
         mBrowserBox->clearRows();
@@ -2066,8 +2066,8 @@ void PopupMenu::showPopup(int x, int y)
 }
 
 RenameListener::RenameListener() :
-    mMapItem(0),
-    mDialog(0)
+    mMapItem(nullptr),
+    mDialog(nullptr)
 {
 }
 
@@ -2080,7 +2080,7 @@ void RenameListener::action(const gcn::ActionEvent &event)
             return;
 
         SpecialLayer *sl = map->getSpecialLayer();
-        MapItem *item = 0;
+        MapItem *item = nullptr;
         if (sl)
         {
             item = sl->getTile(mMapItem->getX(), mMapItem->getY());
@@ -2099,12 +2099,12 @@ void RenameListener::action(const gcn::ActionEvent &event)
         if (socialWindow)
             socialWindow->updatePortalNames();
     }
-    mDialog = 0;
+    mDialog = nullptr;
 }
 
 PlayerListener::PlayerListener() :
     mNick(""),
-    mDialog(0),
+    mDialog(nullptr),
     mType(Being::UNKNOWN)
 {
 }
@@ -2120,5 +2120,5 @@ void PlayerListener::action(const gcn::ActionEvent &event)
             being->setComment(comment);
         Being::saveComment(mNick, comment, mType);
     }
-    mDialog = 0;
+    mDialog = nullptr;
 }
diff --git a/src/gui/quitdialog.cpp b/src/gui/quitdialog.cpp
index 1307e198f..0f4d7f6f7 100644
--- a/src/gui/quitdialog.cpp
+++ b/src/gui/quitdialog.cpp
@@ -44,7 +44,7 @@
 #include "debug.h"
 
 QuitDialog::QuitDialog(QuitDialog** pointerToMe):
-    Window(_("Quit"), true, 0, "quit.xml"),
+    Window(_("Quit"), true, nullptr, "quit.xml"),
     mMyPointer(pointerToMe)
 {
     mForceQuit = new RadioButton(_("Quit"), "quitdialog");
@@ -98,16 +98,16 @@ QuitDialog::QuitDialog(QuitDialog** pointerToMe):
 QuitDialog::~QuitDialog()
 {
     if (mMyPointer)
-        *mMyPointer = 0;
+        *mMyPointer = nullptr;
     // Optional widgets, so delete them by hand.
     delete mForceQuit;
-    mForceQuit = 0;
+    mForceQuit = nullptr;
     delete mLogoutQuit;
-    mLogoutQuit = 0;
+    mLogoutQuit = nullptr;
     delete mSwitchAccountServer;
-    mSwitchAccountServer = 0;
+    mSwitchAccountServer = nullptr;
     delete mSwitchCharacter;
-    mSwitchCharacter = 0;
+    mSwitchCharacter = nullptr;
 }
 
 void QuitDialog::placeOption(ContainerPlacer &placer, gcn::RadioButton *option)
@@ -162,10 +162,10 @@ void QuitDialog::keyPressed(gcn::KeyEvent &keyEvent)
     switch (key.getValue())
     {
         case Key::ENTER:
-            action(gcn::ActionEvent(NULL, mOkButton->getActionEventId()));
+            action(gcn::ActionEvent(nullptr, mOkButton->getActionEventId()));
             break;
         case Key::ESCAPE:
-            action(gcn::ActionEvent(NULL, mCancelButton->getActionEventId()));
+            action(gcn::ActionEvent(nullptr, mCancelButton->getActionEventId()));
             break;
         case Key::UP:
             dir = -1;
diff --git a/src/gui/register.cpp b/src/gui/register.cpp
index 062275b80..29030aa72 100644
--- a/src/gui/register.cpp
+++ b/src/gui/register.cpp
@@ -47,7 +47,7 @@
 #include "debug.h"
 
 WrongDataNoticeListener::WrongDataNoticeListener():
-    mTarget(0)
+    mTarget(nullptr)
 {
 }
 
@@ -63,10 +63,10 @@ void WrongDataNoticeListener::action(const gcn::ActionEvent &event)
 }
 
 RegisterDialog::RegisterDialog(LoginData *data):
-    Window(_("Register"), false, 0, "register.xml"),
-    mEmailField(0),
-    mMaleButton(0),
-    mFemaleButton(0),
+    Window(_("Register"), false, nullptr, "register.xml"),
+    mEmailField(nullptr),
+    mMaleButton(nullptr),
+    mFemaleButton(nullptr),
     mWrongDataNoticeListener(new WrongDataNoticeListener),
     mLoginData(data)
 {
@@ -147,7 +147,7 @@ RegisterDialog::RegisterDialog(LoginData *data):
 RegisterDialog::~RegisterDialog()
 {
     delete mWrongDataNoticeListener;
-    mWrongDataNoticeListener = 0;
+    mWrongDataNoticeListener = nullptr;
 }
 
 void RegisterDialog::action(const gcn::ActionEvent &event)
diff --git a/src/gui/sdlfont.cpp b/src/gui/sdlfont.cpp
index b196ae4e4..001a8671a 100644
--- a/src/gui/sdlfont.cpp
+++ b/src/gui/sdlfont.cpp
@@ -49,14 +49,14 @@ class SDLTextChunk
 {
     public:
         SDLTextChunk(const std::string &text0, const gcn::Color &color0) :
-            img(0), text(text0), color(color0)
+            img(nullptr), text(text0), color(color0)
         {
         }
 
         ~SDLTextChunk()
         {
             delete img;
-            img = 0;
+            img = nullptr;
         }
 
         bool operator==(const SDLTextChunk &chunk) const
@@ -79,7 +79,7 @@ class SDLTextChunk
 
             if (!surface)
             {
-                img = 0;
+                img = nullptr;
                 return;
             }
 
@@ -138,7 +138,7 @@ SDLFont::SDLFont(const std::string &filename, int size, int style) :
 SDLFont::~SDLFont()
 {
     TTF_CloseFont(mFont);
-    mFont = 0;
+    mFont = nullptr;
     --fontCounter;
 
     if (fontCounter == 0)
diff --git a/src/gui/selldialog.cpp b/src/gui/selldialog.cpp
index bbd0a71c1..e1a77f6c9 100644
--- a/src/gui/selldialog.cpp
+++ b/src/gui/selldialog.cpp
@@ -50,14 +50,14 @@
 SellDialog::DialogList SellDialog::instances;
 
 SellDialog::SellDialog(int npcId):
-    Window(_("Sell"), false, 0, "sell.xml"),
+    Window(_("Sell"), false, nullptr, "sell.xml"),
     mNpcId(npcId), mMaxItems(0), mAmountItems(0), mNick("")
 {
     init();
 }
 
 SellDialog::SellDialog(std::string nick):
-    Window(_("Sell"), false, 0, "sell.xml"),
+    Window(_("Sell"), false, nullptr, "sell.xml"),
     mNpcId(-1), mMaxItems(0), mAmountItems(0), mNick(nick)
 {
     init();
@@ -133,7 +133,7 @@ void SellDialog::init()
 SellDialog::~SellDialog()
 {
     delete mShopItems;
-    mShopItems = 0;
+    mShopItems = nullptr;
 
     instances.remove(this);
 }
@@ -290,7 +290,7 @@ void SellDialog::updateButtonsAndLabels()
 {
     int selectedItem = mShopItemList->getSelected();
     int income = 0;
-    ShopItem *item = 0;
+    ShopItem *item = nullptr;
 
     if (selectedItem > -1 && mShopItems->at(selectedItem))
     {
diff --git a/src/gui/serverdialog.cpp b/src/gui/serverdialog.cpp
index 5a00d4a76..3fd298159 100644
--- a/src/gui/serverdialog.cpp
+++ b/src/gui/serverdialog.cpp
@@ -234,15 +234,15 @@ private:
 
 
 ServerDialog::ServerDialog(ServerInfo *serverInfo, const std::string &dir):
-    Window(_("Choose Your Server"), false, 0, "server.xml"),
+    Window(_("Choose Your Server"), false, nullptr, "server.xml"),
     mDir(dir),
 //    mDownloadStatus(DOWNLOADING_PREPARING),
     mDownloadStatus(DOWNLOADING_UNKNOWN),
-    mDownload(0),
+    mDownload(nullptr),
     mDownloadProgress(-1.0f),
     mServers(ServerInfos()),
     mServerInfo(serverInfo),
-    mPersistentIPCheckBox(0)
+    mPersistentIPCheckBox(nullptr)
 {
     if (isSafeMode)
         setCaption(_("Choose Your Server  *** SAFE MODE ***"));
@@ -377,12 +377,12 @@ ServerDialog::~ServerDialog()
     {
         mDownload->cancel();
         delete mDownload;
-        mDownload = 0;
+        mDownload = nullptr;
     }
     delete mServersListModel;
-    mServersListModel = 0;
+    mServersListModel = nullptr;
     delete mTypeListModel;
-    mTypeListModel = 0;
+    mTypeListModel = nullptr;
 }
 
 void ServerDialog::action(const gcn::ActionEvent &event)
@@ -489,7 +489,7 @@ void ServerDialog::keyPressed(gcn::KeyEvent &keyEvent)
     if (key.getValue() == Key::ESCAPE)
         Client::setState(STATE_EXIT);
     else if (key.getValue() == Key::ENTER)
-        action(gcn::ActionEvent(NULL, mConnectButton->getActionEventId()));
+        action(gcn::ActionEvent(nullptr, mConnectButton->getActionEventId()));
 }
 
 void ServerDialog::valueChanged(const gcn::SelectionEvent &)
@@ -617,7 +617,7 @@ void ServerDialog::downloadServerList()
     {
         mDownload->cancel();
         delete mDownload;
-        mDownload = 0;
+        mDownload = nullptr;
     }
 
     mDownload = new Net::Download(this, listFile, &downloadUpdate);
diff --git a/src/gui/setup.cpp b/src/gui/setup.cpp
index ae7a3109c..d305824d5 100644
--- a/src/gui/setup.cpp
+++ b/src/gui/setup.cpp
@@ -51,7 +51,7 @@
 extern Window *statusWindow;
 
 Setup::Setup():
-    Window(_("Setup"), false, 0, "setup.xml")
+    Window(_("Setup"), false, nullptr, "setup.xml")
 {
     setCloseButton(true);
     setResizable(true);
@@ -72,7 +72,7 @@ Setup::Setup():
         N_("Cancel"),
         N_("Store"),
         N_("Reset Windows"),
-        0
+        nullptr
     };
     int x = width;
     for (const char **curBtn = buttonNames; *curBtn; ++curBtn)
diff --git a/src/gui/setup_colors.cpp b/src/gui/setup_colors.cpp
index 7c0306f8f..6f1a4afce 100644
--- a/src/gui/setup_colors.cpp
+++ b/src/gui/setup_colors.cpp
@@ -65,7 +65,7 @@ Setup_Colors::Setup_Colors() :
     mPreview->setOpaque(false);
 
     // don't do anything with links
-    mPreview->setLinkHandler(NULL);
+    mPreview->setLinkHandler(nullptr);
 
     mPreviewBox = new ScrollArea(mPreview);
     mPreviewBox->setHeight(20);
@@ -188,12 +188,12 @@ Setup_Colors::~Setup_Colors()
     if (mPreviewBox && mPreviewBox->getContent() == mPreview)
     {
         delete mTextPreview;
-        mTextPreview = 0;
+        mTextPreview = nullptr;
     }
     else
     {
         delete mPreview;
-        mPreview = 0;
+        mPreview = nullptr;
     }
 }
 
@@ -251,7 +251,7 @@ void Setup_Colors::valueChanged(const gcn::SelectionEvent &event A_UNUSED)
     mPreviewBox->setContent(mTextPreview);
     mTextPreview->setFont(boldFont);
     mTextPreview->setTextColor(col);
-    mTextPreview->setTextBGColor(NULL);
+    mTextPreview->setTextBGColor(nullptr);
     mTextPreview->setOpaque(false);
     mTextPreview->setShadow(true);
     mTextPreview->setOutline(true);
diff --git a/src/gui/setup_keyboard.cpp b/src/gui/setup_keyboard.cpp
index 922d9797b..fa7a63b8c 100644
--- a/src/gui/setup_keyboard.cpp
+++ b/src/gui/setup_keyboard.cpp
@@ -112,16 +112,16 @@ Setup_Keyboard::Setup_Keyboard():
 Setup_Keyboard::~Setup_Keyboard()
 {
     delete mKeyList;
-    mKeyList = 0;
+    mKeyList = nullptr;
     delete mKeyListModel;
-    mKeyListModel = 0;
+    mKeyListModel = nullptr;
 
     delete mAssignKeyButton;
-    mAssignKeyButton = 0;
+    mAssignKeyButton = nullptr;
     delete mUnassignKeyButton;
-    mUnassignKeyButton = 0;
+    mUnassignKeyButton = nullptr;
     delete mMakeDefaultButton;
-    mMakeDefaultButton = 0;
+    mMakeDefaultButton = nullptr;
 }
 
 void Setup_Keyboard::apply()
diff --git a/src/gui/setup_relations.cpp b/src/gui/setup_relations.cpp
index 73fd34e27..1921ee267 100644
--- a/src/gui/setup_relations.cpp
+++ b/src/gui/setup_relations.cpp
@@ -98,7 +98,7 @@ class PlayerTableModel : public TableModel
 {
 public:
     PlayerTableModel() :
-        mPlayers(NULL),
+        mPlayers(nullptr),
         mListModel(new PlayerRelationListModel)
     {
         playerRelationsUpdated();
diff --git a/src/gui/setup_theme.cpp b/src/gui/setup_theme.cpp
index 04d4c5412..3b1c1d932 100644
--- a/src/gui/setup_theme.cpp
+++ b/src/gui/setup_theme.cpp
@@ -155,7 +155,7 @@ const Language LANG_NAME[langs_count] =
     {N_("Portuguese"), "pt_PT"},
     {N_("Portuguese (Brazilian)"), "pt_BR"},
     {N_("Russian"), "ru_RU"},
-    {N_("Spanish (Castilian)"), "es_ES"},
+    {N_("Spanish (Castilian)"), "es_ES"}
 };
 
 class LangListModel : public gcn::ListModel
@@ -302,16 +302,16 @@ Setup_Theme::Setup_Theme():
 Setup_Theme::~Setup_Theme()
 {
     delete mThemesModel;
-    mThemesModel = 0;
+    mThemesModel = nullptr;
 
     delete mFontsModel;
-    mFontsModel = 0;
+    mFontsModel = nullptr;
 
     delete mFontSizeListModel;
-    mFontSizeListModel = 0;
+    mFontSizeListModel = nullptr;
 
     delete mLangListModel;
-    mLangListModel = 0;
+    mLangListModel = nullptr;
 }
 
 void Setup_Theme::action(const gcn::ActionEvent &event)
diff --git a/src/gui/setup_video.cpp b/src/gui/setup_video.cpp
index d3c1163dc..ea181ea14 100644
--- a/src/gui/setup_video.cpp
+++ b/src/gui/setup_video.cpp
@@ -130,7 +130,7 @@ bool modeSorter(std::string mode1, std::string mode2)
 ModeListModel::ModeListModel()
 {
     /* Get available fullscreen/hardware modes */
-    SDL_Rect **modes = SDL_ListModes(NULL, SDL_FULLSCREEN | SDL_HWSURFACE);
+    SDL_Rect **modes = SDL_ListModes(nullptr, SDL_FULLSCREEN | SDL_HWSURFACE);
 
     /* Check which modes are available */
     if (modes == static_cast<SDL_Rect **>(0))
diff --git a/src/gui/shortcutwindow.cpp b/src/gui/shortcutwindow.cpp
index 6d48da197..eff28def7 100644
--- a/src/gui/shortcutwindow.cpp
+++ b/src/gui/shortcutwindow.cpp
@@ -54,7 +54,7 @@ ShortcutWindow::ShortcutWindow(const std::string &title,
                                ShortcutContainer *content,
                                std::string skinFile,
                                int width, int height) :
-    Window("Window", false, 0, skinFile)
+    Window("Window", false, nullptr, skinFile)
 {
     setWindowName(title);
     // no title presented, title bar is padding so window can be moved.
@@ -66,7 +66,7 @@ ShortcutWindow::ShortcutWindow(const std::string &title,
 
     setupWindow->registerWindowForReset(this);
 
-    mTabs = 0;
+    mTabs = nullptr;
     mItems = content;
 
     const int border = SCROLL_PADDING * 2 + getPadding() * 2;
@@ -100,7 +100,7 @@ ShortcutWindow::ShortcutWindow(const std::string &title,
 
 ShortcutWindow::ShortcutWindow(const std::string &title, std::string skinFile,
                                int width, int height) :
-    Window("Window", false, 0, skinFile)
+    Window("Window", false, nullptr, skinFile)
 {
     setWindowName(title);
     // no title presented, title bar is padding so window can be moved.
@@ -114,7 +114,7 @@ ShortcutWindow::ShortcutWindow(const std::string &title, std::string skinFile,
 
     mTabs = new TabbedArea;
 
-    mItems = 0;
+    mItems = nullptr;
 
     const int border = SCROLL_PADDING * 2 + getPadding() * 2;
 
@@ -138,9 +138,9 @@ ShortcutWindow::~ShortcutWindow()
     if (mTabs)
         mTabs->removeAll();
     delete mTabs;
-    mTabs = 0;
+    mTabs = nullptr;
     delete mItems;
-    mItems = 0;
+    mItems = nullptr;
 }
 
 void ShortcutWindow::addTab(std::string name, ShortcutContainer *content)
diff --git a/src/gui/socialwindow.cpp b/src/gui/socialwindow.cpp
index a728d4051..6b07e109f 100644
--- a/src/gui/socialwindow.cpp
+++ b/src/gui/socialwindow.cpp
@@ -79,14 +79,14 @@ protected:
         {
             mInviteDialog->close();
             mInviteDialog->scheduleDelete();
-            mInviteDialog = NULL;
+            mInviteDialog = nullptr;
         }
 
         if (mConfirmDialog)
         {
             mConfirmDialog->close();
             mConfirmDialog->scheduleDelete();
-            mConfirmDialog = NULL;
+            mConfirmDialog = nullptr;
         }
     }
 
@@ -347,11 +347,11 @@ public:
                 localChatTab->chatLog(strprintf(_("Invited user %s to party."),
                                       name.c_str()), BY_SERVER);
             }
-            mInviteDialog = NULL;
+            mInviteDialog = nullptr;
         }
         else if (event.getId() == "~do invite")
         {
-            mInviteDialog = NULL;
+            mInviteDialog = nullptr;
         }
         else if (event.getId() == "yes")
         {
@@ -361,11 +361,11 @@ public:
                 localChatTab->chatLog(strprintf(_("Party %s quit requested."),
                                       mParty->getName().c_str()), BY_SERVER);
             }
-            mConfirmDialog = NULL;
+            mConfirmDialog = nullptr;
         }
         else if (event.getId() == "~yes")
         {
-            mConfirmDialog = NULL;
+            mConfirmDialog = nullptr;
         }
     }
 
@@ -1146,7 +1146,7 @@ SocialWindow::SocialWindow() :
     place(2, 0, mLeaveButton);
     place(0, 1, mTabs, 4, 4);
 
-    widgetResized(NULL);
+    widgetResized(nullptr);
 
     mCreatePopup = new CreatePopup();
 
@@ -1184,7 +1184,7 @@ SocialWindow::~SocialWindow()
     {
         mGuildAcceptDialog->close();
         mGuildAcceptDialog->scheduleDelete();
-        mGuildAcceptDialog = NULL;
+        mGuildAcceptDialog = nullptr;
 
         mGuildInvited = 0;
     }
@@ -1193,7 +1193,7 @@ SocialWindow::~SocialWindow()
     {
         mPartyAcceptDialog->close();
         mPartyAcceptDialog->scheduleDelete();
-        mPartyAcceptDialog = NULL;
+        mPartyAcceptDialog = nullptr;
 
         mPartyInviter = "";
     }
@@ -1300,7 +1300,7 @@ void SocialWindow::action(const gcn::ActionEvent &event)
         }
 
         mPartyInviter = "";
-        mPartyAcceptDialog = NULL;
+        mPartyAcceptDialog = nullptr;
     }
     else if (event.getSource() == mGuildAcceptDialog)
     {
@@ -1333,7 +1333,7 @@ void SocialWindow::action(const gcn::ActionEvent &event)
         }
 
         mGuildInvited = 0;
-        mGuildAcceptDialog = NULL;
+        mGuildAcceptDialog = nullptr;
     }
     else if (event.getId() == "create")
     {
@@ -1374,11 +1374,11 @@ void SocialWindow::action(const gcn::ActionEvent &event)
                                   name.c_str()), BY_SERVER);
         }
 
-        mGuildCreateDialog = NULL;
+        mGuildCreateDialog = nullptr;
     }
     else if (event.getId() == "~create guild")
     {
-        mGuildCreateDialog = NULL;
+        mGuildCreateDialog = nullptr;
     }
     else if (event.getId() == "create party")
     {
@@ -1397,11 +1397,11 @@ void SocialWindow::action(const gcn::ActionEvent &event)
                                   name.c_str()), BY_SERVER);
         }
 
-        mPartyCreateDialog = NULL;
+        mPartyCreateDialog = nullptr;
     }
     else if (event.getId() == "~create party")
     {
-        mPartyCreateDialog = NULL;
+        mPartyCreateDialog = nullptr;
     }
 }
 
diff --git a/src/gui/specialswindow.cpp b/src/gui/specialswindow.cpp
index c464b83b5..a52b30c62 100644
--- a/src/gui/specialswindow.cpp
+++ b/src/gui/specialswindow.cpp
@@ -194,10 +194,10 @@ void SpecialsWindow::rebuild(const std::map<int, Special> &specialData)
 
 SpecialEntry::SpecialEntry(SpecialInfo *info) :
     mInfo(info),
-    mIcon(NULL),
-    mLevelLabel(NULL),
-    mUse(NULL),
-    mRechargeBar(NULL)
+    mIcon(nullptr),
+    mLevelLabel(nullptr),
+    mUse(nullptr),
+    mRechargeBar(nullptr)
 {
     setFrameSize(1);
     setOpaque(false);
diff --git a/src/gui/textcommandeditor.cpp b/src/gui/textcommandeditor.cpp
index 6512f8465..7d97549f3 100644
--- a/src/gui/textcommandeditor.cpp
+++ b/src/gui/textcommandeditor.cpp
@@ -165,7 +165,7 @@ public:
 
 
 TextCommandEditor::TextCommandEditor(TextCommand *command):
-    Window(_("Command Editor"), false, 0, "commandeditor.xml")
+    Window(_("Command Editor"), false, nullptr, "commandeditor.xml")
 {
     int w = 350;
     int h = 370;
@@ -302,11 +302,11 @@ TextCommandEditor::TextCommandEditor(TextCommand *command):
 TextCommandEditor::~TextCommandEditor()
 {
     delete mIconsModal;
-    mIconsModal = 0;
+    mIconsModal = nullptr;
     delete mTargetTypeModel;
-    mTargetTypeModel = 0;
+    mTargetTypeModel = nullptr;
     delete mMagicSchoolModel;
-    mMagicSchoolModel = 0;
+    mMagicSchoolModel = nullptr;
 }
 
 void TextCommandEditor::action(const gcn::ActionEvent &event)
diff --git a/src/gui/updaterwindow.cpp b/src/gui/updaterwindow.cpp
index 2efe82199..b605d30df 100644
--- a/src/gui/updaterwindow.cpp
+++ b/src/gui/updaterwindow.cpp
@@ -147,8 +147,8 @@ UpdaterWindow::UpdaterWindow(const std::string &updateHost,
     mDownloadComplete(true),
     mUserCancel(false),
     mDownloadedBytes(0),
-    mMemoryBuffer(NULL),
-    mDownload(NULL),
+    mMemoryBuffer(nullptr),
+    mDownload(nullptr),
     mUpdateIndex(0),
     mUpdateIndexOffset(0),
     mLoadUpdates(applyUpdates),
@@ -256,7 +256,7 @@ void UpdaterWindow::keyPressed(gcn::KeyEvent &keyEvent)
 
     if (key.getValue() == Key::ESCAPE)
     {
-        action(gcn::ActionEvent(NULL, mCancelButton->getActionEventId()));
+        action(gcn::ActionEvent(nullptr, mCancelButton->getActionEventId()));
         Client::setState(STATE_WORLD_SELECT);
     }
     else if (key.getValue() == Key::ENTER)
@@ -264,11 +264,11 @@ void UpdaterWindow::keyPressed(gcn::KeyEvent &keyEvent)
         if (mDownloadStatus == UPDATE_COMPLETE ||
             mDownloadStatus == UPDATE_ERROR)
         {
-            action(gcn::ActionEvent(NULL, mPlayButton->getActionEventId()));
+            action(gcn::ActionEvent(nullptr, mPlayButton->getActionEventId()));
         }
         else
         {
-            action(gcn::ActionEvent(NULL, mCancelButton->getActionEventId()));
+            action(gcn::ActionEvent(nullptr, mCancelButton->getActionEventId()));
         }
     }
 }
@@ -294,12 +294,12 @@ void UpdaterWindow::loadNews()
     while (line)
     {
         mBrowserBox->addRow(line);
-        line = strtok(NULL, "\n");
+        line = strtok(nullptr, "\n");
     }
 
     // Free the memory buffer now that we don't need it anymore
     free(mMemoryBuffer);
-    mMemoryBuffer = NULL;
+    mMemoryBuffer = nullptr;
     mDownloadedBytes = 0;
 
     mScrollArea->setVerticalScrollAmount(0);
@@ -340,7 +340,7 @@ void UpdaterWindow::loadPatch()
 
     // Free the memory buffer now that we don't need it anymore
     free(mMemoryBuffer);
-    mMemoryBuffer = NULL;
+    mMemoryBuffer = nullptr;
     mDownloadedBytes = 0;
 
     mScrollArea->setVerticalScrollAmount(0);
@@ -365,7 +365,7 @@ int UpdaterWindow::updateProgress(void *ptr, DownloadStatus status,
             uw->mDownloadStatus = UPDATE_COMPLETE;
             uw->mDownloadComplete = true;
             free(uw->mMemoryBuffer);
-            uw->mMemoryBuffer = NULL;
+            uw->mMemoryBuffer = nullptr;
         }
         else
         {
diff --git a/src/gui/viewport.cpp b/src/gui/viewport.cpp
index 97a467add..13c0a8cc0 100644
--- a/src/gui/viewport.cpp
+++ b/src/gui/viewport.cpp
@@ -298,8 +298,8 @@ void Viewport::_followMouse()
     if (mPlayerFollowMouse && button & SDL_BUTTON(1))
     {
         // We create a mouse event and send it to mouseDragged.
-        Uint8 *keys = SDL_GetKeyState(NULL);
-        gcn::MouseEvent mouseEvent(NULL,
+        Uint8 *keys = SDL_GetKeyState(nullptr);
+        gcn::MouseEvent mouseEvent(nullptr,
                       (keys[SDLK_LSHIFT] || keys[SDLK_RSHIFT]),
                       false,
                       false,
diff --git a/src/gui/whoisonline.cpp b/src/gui/whoisonline.cpp
index 3fb63a105..b6d67fa83 100644
--- a/src/gui/whoisonline.cpp
+++ b/src/gui/whoisonline.cpp
@@ -83,11 +83,11 @@ class NameFunctuator
 
 WhoIsOnline::WhoIsOnline():
     Window(_("Who Is Online - Updating"), false, 0, "whoisonline.xml"),
-    mThread(NULL),
+    mThread(nullptr),
     mDownloadStatus(UPDATE_LIST),
     mDownloadComplete(true),
     mDownloadedBytes(0),
-    mMemoryBuffer(NULL),
+    mMemoryBuffer(nullptr),
     mCurlError(new char[CURL_ERROR_SIZE]),
     mAllowUpdate(true),
     mShowLevel(false)
@@ -137,7 +137,7 @@ WhoIsOnline::~WhoIsOnline()
     config.removeListener("updateOnlineList", this);
 
     if (mThread && SDL_GetThreadID(mThread))
-        SDL_WaitThread(mThread, NULL);
+        SDL_WaitThread(mThread, nullptr);
 
     free(mMemoryBuffer);
     mMemoryBuffer = 0;
@@ -206,7 +206,7 @@ void WhoIsOnline::loadList()
 
     mShowLevel = config.getBoolValue("showlevel");
 
-    while (line != NULL)
+    while (line)
     {
         std::string nick;
         lineStr = line;
@@ -295,7 +295,7 @@ void WhoIsOnline::loadList()
         {
             listStarted = true;
         }
-        line = strtok(NULL, "\n");
+        line = strtok(nullptr, "\n");
     }
 
     //Set window caption
@@ -448,12 +448,12 @@ void WhoIsOnline::download()
 {
     mDownloadComplete = true;
     if (mThread && SDL_GetThreadID(mThread))
-        SDL_WaitThread(mThread, NULL);
+        SDL_WaitThread(mThread, nullptr);
 
     mDownloadComplete = false;
     mThread = SDL_CreateThread(WhoIsOnline::downloadThread, this);
 
-    if (mThread == NULL)
+    if (mThread == nullptr)
         mDownloadStatus = UPDATE_ERROR;
 }
 
@@ -525,8 +525,8 @@ void WhoIsOnline::action(const gcn::ActionEvent &event)
             setCaption(_("Who Is Online - Update"));
             if (mThread && SDL_GetThreadID(mThread))
             {
-                SDL_WaitThread(mThread, NULL);
-                mThread = NULL;
+                SDL_WaitThread(mThread, nullptr);
+                mThread = nullptr;
             }
             mDownloadComplete = true;
         }
diff --git a/src/gui/widgets/avatarlistbox.cpp b/src/gui/widgets/avatarlistbox.cpp
index 18dc48417..8264f0fb9 100644
--- a/src/gui/widgets/avatarlistbox.cpp
+++ b/src/gui/widgets/avatarlistbox.cpp
@@ -43,8 +43,8 @@
 #include "debug.h"
 
 int AvatarListBox::instances = 0;
-Image *AvatarListBox::onlineIcon = 0;
-Image *AvatarListBox::offlineIcon = 0;
+Image *AvatarListBox::onlineIcon = nullptr;
+Image *AvatarListBox::offlineIcon = nullptr;
 
 AvatarListBox::AvatarListBox(AvatarListModel *model):
     ListBox(model),
@@ -83,12 +83,12 @@ AvatarListBox::~AvatarListBox()
         if (onlineIcon)
         {
             onlineIcon->decRef();
-            onlineIcon = 0;
+            onlineIcon = nullptr;
         }
         if (offlineIcon)
         {
             offlineIcon->decRef();
-            offlineIcon = 0;
+            offlineIcon = nullptr;
         }
     }
 }
diff --git a/src/gui/widgets/browserbox.cpp b/src/gui/widgets/browserbox.cpp
index 5b862d16c..5ded29c55 100644
--- a/src/gui/widgets/browserbox.cpp
+++ b/src/gui/widgets/browserbox.cpp
@@ -49,8 +49,9 @@
 
 BrowserBox::BrowserBox(unsigned int mode, bool opaque):
     gcn::Widget(),
-    mLinkHandler(0),
-    mMode(mode), mHighMode(UNDERLINE | BACKGROUND),
+    mLinkHandler(nullptr),
+    mMode(mode),
+    mHighMode(UNDERLINE | BACKGROUND),
     mOpaque(opaque),
     mUseLinksAndUserColors(true),
     mSelectedLink(-1),
@@ -648,5 +649,5 @@ LinePart::~LinePart()
 {
     if (mImage)
         mImage->decRef();
-    mImage = 0;
+    mImage = nullptr;
 }
diff --git a/src/gui/widgets/browserbox.h b/src/gui/widgets/browserbox.h
index cf2f9c1f1..06609b318 100644
--- a/src/gui/widgets/browserbox.h
+++ b/src/gui/widgets/browserbox.h
@@ -30,6 +30,8 @@
 #include <list>
 #include <vector>
 
+#include "localconsts.h"
+
 class Image;
 class Resource;
 class LinkHandler;
@@ -46,7 +48,7 @@ class LinePart
     public:
         LinePart(int x, int y, gcn::Color color, std::string text, bool bold) :
             mX(x), mY(y), mColor(color), mText(text), mType(0),
-            mImage(0), mBold(bold)
+            mImage(nullptr), mBold(bold)
         {
         }
 
diff --git a/src/gui/widgets/button.cpp b/src/gui/widgets/button.cpp
index 7c46ae9df..85e4eca17 100644
--- a/src/gui/widgets/button.cpp
+++ b/src/gui/widgets/button.cpp
@@ -146,7 +146,7 @@ Button::~Button()
     mInstances--;
 
     delete mVertexes;
-    mVertexes = 0;
+    mVertexes = nullptr;
     if (mInstances == 0)
     {
         for (int mode = 0; mode < BUTTON_COUNT; mode++)
diff --git a/src/gui/widgets/chattab.cpp b/src/gui/widgets/chattab.cpp
index 9a29ae204..0a224605a 100644
--- a/src/gui/widgets/chattab.cpp
+++ b/src/gui/widgets/chattab.cpp
@@ -82,9 +82,9 @@ ChatTab::~ChatTab()
         chatWindow->removeTab(this);
 
     delete mTextOutput;
-    mTextOutput = 0;
+    mTextOutput = nullptr;
     delete mScrollArea;
-    mScrollArea = 0;
+    mScrollArea = nullptr;
 }
 
 void ChatTab::chatLog(std::string line, Own own,
diff --git a/src/gui/widgets/checkbox.cpp b/src/gui/widgets/checkbox.cpp
index 65d26e196..dcedc8951 100644
--- a/src/gui/widgets/checkbox.cpp
+++ b/src/gui/widgets/checkbox.cpp
@@ -70,12 +70,12 @@ CheckBox::CheckBox(const std::string &caption, bool selected,
         }
         else
         {
-            checkBoxNormal = 0;
-            checkBoxChecked = 0;
-            checkBoxDisabled = 0;
-            checkBoxDisabledChecked = 0;
-            checkBoxNormalHi = 0;
-            checkBoxCheckedHi = 0;
+            checkBoxNormal = nullptr;
+            checkBoxChecked = nullptr;
+            checkBoxDisabled = nullptr;
+            checkBoxDisabledChecked = nullptr;
+            checkBoxNormalHi = nullptr;
+            checkBoxCheckedHi = nullptr;
         }
     }
 
@@ -97,17 +97,17 @@ CheckBox::~CheckBox()
     if (instances == 0)
     {
         delete checkBoxNormal;
-        checkBoxNormal = 0;
+        checkBoxNormal = nullptr;
         delete checkBoxChecked;
-        checkBoxChecked = 0;
+        checkBoxChecked = nullptr;
         delete checkBoxDisabled;
-        checkBoxDisabled = 0;
+        checkBoxDisabled = nullptr;
         delete checkBoxDisabledChecked;
-        checkBoxDisabledChecked = 0;
+        checkBoxDisabledChecked = nullptr;
         delete checkBoxNormalHi;
-        checkBoxNormalHi = 0;
+        checkBoxNormalHi = nullptr;
         delete checkBoxCheckedHi;
-        checkBoxCheckedHi = 0;
+        checkBoxCheckedHi = nullptr;
     }
 }
 
diff --git a/src/gui/widgets/checkbox.h b/src/gui/widgets/checkbox.h
index a16ab242c..4e293aad6 100644
--- a/src/gui/widgets/checkbox.h
+++ b/src/gui/widgets/checkbox.h
@@ -25,6 +25,8 @@
 
 #include <guichan/widgets/checkbox.hpp>
 
+#include "localconsts.h"
+
 #ifdef __GNUC__
 #define A_UNUSED  __attribute__ ((unused))
 #else
@@ -45,7 +47,7 @@ class CheckBox : public gcn::CheckBox
          * Constructor.
          */
         CheckBox(const std::string &caption, bool selected = false,
-                 gcn::ActionListener* listener = NULL,
+                 gcn::ActionListener* listener = nullptr,
                  std::string eventId = "");
 
         /**
diff --git a/src/gui/widgets/desktop.cpp b/src/gui/widgets/desktop.cpp
index 46240f76d..beb232fb2 100644
--- a/src/gui/widgets/desktop.cpp
+++ b/src/gui/widgets/desktop.cpp
@@ -39,7 +39,7 @@
 #include "debug.h"
 
 Desktop::Desktop() :
-    mWallpaper(0)
+    mWallpaper(nullptr)
 {
     addWidgetListener(this);
 
@@ -66,7 +66,7 @@ Desktop::~Desktop()
     if (mWallpaper)
     {
         mWallpaper->decRef();
-        mWallpaper = 0;
+        mWallpaper = nullptr;
     }
 }
 
diff --git a/src/gui/widgets/dropdown.cpp b/src/gui/widgets/dropdown.cpp
index 687d7dc6d..2a17320de 100644
--- a/src/gui/widgets/dropdown.cpp
+++ b/src/gui/widgets/dropdown.cpp
@@ -133,7 +133,7 @@ DropDown::~DropDown()
     }
 
     delete mScrollArea;
-    mScrollArea = 0;
+    mScrollArea = nullptr;
 }
 
 void DropDown::updateAlpha()
diff --git a/src/gui/widgets/dropdown.h b/src/gui/widgets/dropdown.h
index 4cbd23314..3559b634a 100644
--- a/src/gui/widgets/dropdown.h
+++ b/src/gui/widgets/dropdown.h
@@ -25,6 +25,8 @@
 
 #include <guichan/widgets/dropdown.hpp>
 
+#include "localconsts.h"
+
 class Image;
 class ImageRect;
 
@@ -47,7 +49,7 @@ class DropDown : public gcn::DropDown
          * @see ListModel, ScrollArea, ListBox.
          */
         DropDown(gcn::ListModel *listModel = 0,
-                 gcn::ActionListener* listener = NULL,
+                 gcn::ActionListener* listener = nullptr,
                  std::string eventId = "");
 
         ~DropDown();
diff --git a/src/gui/widgets/dropshortcutcontainer.cpp b/src/gui/widgets/dropshortcutcontainer.cpp
index 1fa272448..8335a61bc 100644
--- a/src/gui/widgets/dropshortcutcontainer.cpp
+++ b/src/gui/widgets/dropshortcutcontainer.cpp
@@ -49,7 +49,7 @@
 DropShortcutContainer::DropShortcutContainer():
     ShortcutContainer(),
     mItemClicked(false),
-    mItemMoved(NULL)
+    mItemMoved(nullptr)
 {
     addMouseListener(this);
     addWidgetListener(this);
@@ -82,10 +82,10 @@ DropShortcutContainer::~DropShortcutContainer()
     if (mBackgroundImg)
     {
         mBackgroundImg->decRef();
-        mBackgroundImg = 0;
+        mBackgroundImg = nullptr;
     }
     delete mItemPopup;
-    mItemPopup = 0;
+    mItemPopup = nullptr;
 }
 
 void DropShortcutContainer::draw(gcn::Graphics *graphics)
@@ -254,14 +254,14 @@ void DropShortcutContainer::mouseReleased(gcn::MouseEvent &event)
         const int index = getIndexFromGrid(event.getX(), event.getY());
         if (index == -1)
         {
-            mItemMoved = NULL;
+            mItemMoved = nullptr;
             return;
         }
         if (mItemMoved)
         {
             dropShortcut->setItems(index, mItemMoved->getId(),
                 mItemMoved->getColor());
-            mItemMoved = NULL;
+            mItemMoved = nullptr;
         }
 
         if (mItemClicked)
diff --git a/src/gui/widgets/emoteshortcutcontainer.cpp b/src/gui/widgets/emoteshortcutcontainer.cpp
index cc9e8badf..e8d7bb7e3 100644
--- a/src/gui/widgets/emoteshortcutcontainer.cpp
+++ b/src/gui/widgets/emoteshortcutcontainer.cpp
@@ -90,7 +90,7 @@ EmoteShortcutContainer::~EmoteShortcutContainer()
     if (mBackgroundImg)
     {
         mBackgroundImg->decRef();
-        mBackgroundImg = 0;
+        mBackgroundImg = nullptr;
     }
 }
 
diff --git a/src/gui/widgets/flowcontainer.cpp b/src/gui/widgets/flowcontainer.cpp
index 0a64a7142..7d3ddc0b4 100644
--- a/src/gui/widgets/flowcontainer.cpp
+++ b/src/gui/widgets/flowcontainer.cpp
@@ -87,5 +87,5 @@ void FlowContainer::add(gcn::Widget *widget)
 
     Container::add(widget);
     widget->setSize(mBoxWidth, mBoxHeight);
-    widgetResized(NULL);
+    widgetResized(nullptr);
 }
diff --git a/src/gui/widgets/guitable.cpp b/src/gui/widgets/guitable.cpp
index e02eda88c..78ce14e56 100644
--- a/src/gui/widgets/guitable.cpp
+++ b/src/gui/widgets/guitable.cpp
@@ -76,7 +76,7 @@ GuiTableActionListener::~GuiTableActionListener()
     if (mWidget)
     {
         mWidget->removeActionListener(this);
-        mWidget->_setParent(NULL);
+        mWidget->_setParent(nullptr);
     }
 }
 
@@ -92,10 +92,10 @@ GuiTable::GuiTable(TableModel *initial_model, bool opacity) :
     mLinewiseMode(false),
     mWrappingEnabled(false),
     mOpaque(opacity),
-    mModel(NULL),
+    mModel(nullptr),
     mSelectedRow(0),
     mSelectedColumn(0),
-    mTopWidget(NULL)
+    mTopWidget(nullptr)
 {
     mBackgroundColor = Theme::getThemeColor(Theme::BACKGROUND);
     mHighlightColor = Theme::getThemeColor(Theme::HIGHLIGHT);
@@ -110,7 +110,7 @@ GuiTable::~GuiTable()
 {
     uninstallActionListeners();
     delete mModel;
-    mModel = 0;
+    mModel = nullptr;
 }
 
 TableModel *GuiTable::getModel() const
@@ -391,7 +391,7 @@ void GuiTable::moveToBottom(gcn::Widget *widget)
 {
     gcn::Widget::moveToBottom(widget);
     if (widget == mTopWidget)
-        mTopWidget = NULL;
+        mTopWidget = nullptr;
 }
 
 gcn::Rectangle GuiTable::getChildrenArea()
@@ -512,7 +512,7 @@ void GuiTable::modelUpdated(bool completed)
     }
     else
     { // before the update?
-        mTopWidget = NULL; // No longer valid in general
+        mTopWidget = nullptr; // No longer valid in general
         uninstallActionListeners();
     }
 }
@@ -531,10 +531,10 @@ gcn::Widget *GuiTable::getWidgetAt(int x, int y)
         if (w && w->isFocusable())
             return w;
         else
-            return NULL; // Grab the event locally
+            return nullptr; // Grab the event locally
     }
     else
-        return NULL;
+        return nullptr;
 }
 
 int GuiTable::getRowForY(int y) const
diff --git a/src/gui/widgets/guitable.h b/src/gui/widgets/guitable.h
index d248c4820..cf3cb8ad8 100644
--- a/src/gui/widgets/guitable.h
+++ b/src/gui/widgets/guitable.h
@@ -23,6 +23,8 @@
 #ifndef TABLE_H
 #define TABLE_H
 
+#include "localconsts.h"
+
 #include "gui/widgets/tablemodel.h"
 
 #include <guichan/keylistener.hpp>
@@ -57,7 +59,7 @@ class GuiTable : public gcn::Widget,
     friend class GuiTableActionListener;
 
 public:
-    GuiTable(TableModel * initial_model = NULL,
+    GuiTable(TableModel * initial_model = nullptr,
              bool opacity = true);
 
     virtual ~GuiTable();
diff --git a/src/gui/widgets/icon.cpp b/src/gui/widgets/icon.cpp
index 3e9c7dd24..b8cc2ac3a 100644
--- a/src/gui/widgets/icon.cpp
+++ b/src/gui/widgets/icon.cpp
@@ -30,7 +30,7 @@
 #include "debug.h"
 
 Icon::Icon(const std::string &file)
-    : mImage(0)
+    : mImage(nullptr)
 {
     mImage = ResourceManager::getInstance()->getImage(file);
     if (mImage)
diff --git a/src/gui/widgets/itemcontainer.cpp b/src/gui/widgets/itemcontainer.cpp
index 9a17d81cd..57c64093b 100644
--- a/src/gui/widgets/itemcontainer.cpp
+++ b/src/gui/widgets/itemcontainer.cpp
@@ -166,7 +166,7 @@ ItemContainer::ItemContainer(Inventory *inventory, bool forceQuantity):
     mDescItems(false),
     mTag(0),
     mSortType(0),
-    mShowMatrix(0)
+    mShowMatrix(nullptr)
 {
     mItemPopup = new ItemPopup;
     setFocusable(true);
@@ -188,10 +188,10 @@ ItemContainer::~ItemContainer()
     if (mSelImg)
     {
         mSelImg->decRef();
-        mSelImg = 0;
+        mSelImg = nullptr;
     }
     delete mItemPopup;
-    mItemPopup = 0;
+    mItemPopup = nullptr;
     delete []mShowMatrix;
 }
 
@@ -309,7 +309,7 @@ Item *ItemContainer::getSelectedItem() const
     if (mInventory)
         return mInventory->getItem(mSelectedIndex);
     else
-        return 0;
+        return nullptr;
 }
 
 void ItemContainer::distributeValueChangedEvent()
diff --git a/src/gui/widgets/itemlinkhandler.cpp b/src/gui/widgets/itemlinkhandler.cpp
index 6ae0f6b5b..549aa1616 100644
--- a/src/gui/widgets/itemlinkhandler.cpp
+++ b/src/gui/widgets/itemlinkhandler.cpp
@@ -42,7 +42,7 @@ ItemLinkHandler::ItemLinkHandler()
 ItemLinkHandler::~ItemLinkHandler()
 {
     delete mItemPopup;
-    mItemPopup = 0;
+    mItemPopup = nullptr;
 }
 
 void ItemLinkHandler::handleLink(const std::string &link,
diff --git a/src/gui/widgets/itemshortcutcontainer.cpp b/src/gui/widgets/itemshortcutcontainer.cpp
index 560045a29..3682ec448 100644
--- a/src/gui/widgets/itemshortcutcontainer.cpp
+++ b/src/gui/widgets/itemshortcutcontainer.cpp
@@ -51,7 +51,7 @@
 ItemShortcutContainer::ItemShortcutContainer(unsigned number):
     ShortcutContainer(),
     mItemClicked(false),
-    mItemMoved(NULL),
+    mItemMoved(nullptr),
     mNumber(number)
 {
     addMouseListener(this);
@@ -87,12 +87,12 @@ ItemShortcutContainer::~ItemShortcutContainer()
     if (mBackgroundImg)
     {
         mBackgroundImg->decRef();
-        mBackgroundImg = 0;
+        mBackgroundImg = nullptr;
     }
     delete mItemPopup;
-    mItemPopup = 0;
+    mItemPopup = nullptr;
     delete mSpellPopup;
-    mSpellPopup = 0;
+    mSpellPopup = nullptr;
 }
 
 void ItemShortcutContainer::draw(gcn::Graphics *graphics)
@@ -304,14 +304,14 @@ void ItemShortcutContainer::mouseReleased(gcn::MouseEvent &event)
         const int index = getIndexFromGrid(event.getX(), event.getY());
         if (index == -1)
         {
-            mItemMoved = NULL;
+            mItemMoved = nullptr;
             return;
         }
         if (mItemMoved)
         {
             itemShortcut[mNumber]->setItems(index,
                 mItemMoved->getId(), mItemMoved->getColor());
-            mItemMoved = NULL;
+            mItemMoved = nullptr;
         }
         else if (itemShortcut[mNumber]->getItem(index) && mItemClicked)
         {
diff --git a/src/gui/widgets/layout.cpp b/src/gui/widgets/layout.cpp
index 52b92d0bc..7f2f1f621 100644
--- a/src/gui/widgets/layout.cpp
+++ b/src/gui/widgets/layout.cpp
@@ -45,7 +45,7 @@ LayoutCell::~LayoutCell()
     if (mType == ARRAY)
     {
         delete mArray;
-        mArray = 0;
+        mArray = nullptr;
     }
 }
 
@@ -159,7 +159,7 @@ void LayoutArray::resizeGrid(int w, int h)
         i = mCells.begin();
     while (i != mCells.end())
     {
-        i->resize(w, 0);
+        i->resize(w, nullptr);
         ++i;
     }
 }
diff --git a/src/gui/widgets/layout.h b/src/gui/widgets/layout.h
index 5e3ac4532..c4c703644 100644
--- a/src/gui/widgets/layout.h
+++ b/src/gui/widgets/layout.h
@@ -23,6 +23,8 @@
 #ifndef WIDGET_LAYOUT_H
 #define WIDGET_LAYOUT_H
 
+#include "localconsts.h"
+
 #include <guichan/widgets/container.hpp>
 
 #include <vector>
@@ -35,7 +37,7 @@ class LayoutCell;
 class ContainerPlacer
 {
     public:
-        ContainerPlacer(gcn::Container *c = NULL, LayoutCell *l = NULL):
+        ContainerPlacer(gcn::Container *c = nullptr, LayoutCell *l = nullptr):
             mContainer(c), mCell(l)
         {}
 
@@ -172,7 +174,7 @@ class LayoutCell
         };
 
         LayoutCell():
-            mWidget(0),
+            mWidget(nullptr),
             mHPadding(0),
             mVPadding(0),
             mType(NONE)
diff --git a/src/gui/widgets/playerbox.cpp b/src/gui/widgets/playerbox.cpp
index 2efaa2088..fb72176bd 100644
--- a/src/gui/widgets/playerbox.cpp
+++ b/src/gui/widgets/playerbox.cpp
@@ -68,7 +68,7 @@ PlayerBox::PlayerBox(const Being *being):
                 }
                 else
                 {
-                    background.grid[a] = 0;
+                    background.grid[a] = nullptr;
                 }
                 a++;
             }
@@ -85,7 +85,7 @@ PlayerBox::~PlayerBox()
 {
     instances--;
 
-    mBeing = 0;
+    mBeing = nullptr;
 
     if (instances == 0)
         for_each(background.grid, background.grid + 9, dtor<Image*>());
diff --git a/src/gui/widgets/playerbox.h b/src/gui/widgets/playerbox.h
index 1b1a237d8..2bf010618 100644
--- a/src/gui/widgets/playerbox.h
+++ b/src/gui/widgets/playerbox.h
@@ -52,7 +52,8 @@ class PlayerBox : public gcn::ScrollArea
          * player to <code>NULL</code> causes the box not to draw any
          * character.
          */
-        void setPlayer(const Being *being) { mBeing = being; }
+        void setPlayer(const Being *being)
+        { mBeing = being; }
 
         /**
          * Draws the scroll area.
diff --git a/src/gui/widgets/popup.cpp b/src/gui/widgets/popup.cpp
index ac282b088..78557d481 100644
--- a/src/gui/widgets/popup.cpp
+++ b/src/gui/widgets/popup.cpp
@@ -70,7 +70,7 @@ Popup::Popup(const std::string &name, std::string skin):
     }
     else
     {
-        mSkin = 0;
+        mSkin = nullptr;
     }
 
     // Add this window to the window container
@@ -85,13 +85,13 @@ Popup::~Popup()
     logger->log("Popup::~Popup(\"%s\")", mPopupName.c_str());
 
     delete mVertexes;
-    mVertexes = 0;
+    mVertexes = nullptr;
 
     if (mSkin)
     {
         if (Theme::instance())
             Theme::instance()->unload(mSkin);
-        mSkin = 0;
+        mSkin = nullptr;
     }
 }
 
diff --git a/src/gui/widgets/progressbar.cpp b/src/gui/widgets/progressbar.cpp
index 7324fc9ad..f9b6da153 100644
--- a/src/gui/widgets/progressbar.cpp
+++ b/src/gui/widgets/progressbar.cpp
@@ -93,7 +93,7 @@ ProgressBar::ProgressBar(float progress,
         else
         {
             for (int f = 0; f < 9; f ++)
-                mBorder.grid[f] = 0;
+                mBorder.grid[f] = nullptr;
         }
 
     }
@@ -108,7 +108,7 @@ ProgressBar::~ProgressBar()
     if (mInstances == 0)
         for_each(mBorder.grid, mBorder.grid + 9, dtor<Image*>());
     delete mVertexes;
-    mVertexes = 0;
+    mVertexes = nullptr;
 }
 
 void ProgressBar::logic()
diff --git a/src/gui/widgets/radiobutton.cpp b/src/gui/widgets/radiobutton.cpp
index feedeae7b..7d344b09d 100644
--- a/src/gui/widgets/radiobutton.cpp
+++ b/src/gui/widgets/radiobutton.cpp
@@ -112,7 +112,7 @@ void RadioButton::drawBox(gcn::Graphics* graphics)
             radioCheckedHi->setAlpha(mAlpha);
     }
 
-    Image *box = NULL;
+    Image *box = nullptr;
 
     if (isEnabled())
     {
diff --git a/src/gui/widgets/resizegrip.cpp b/src/gui/widgets/resizegrip.cpp
index 861dde29e..c8822eea9 100644
--- a/src/gui/widgets/resizegrip.cpp
+++ b/src/gui/widgets/resizegrip.cpp
@@ -34,7 +34,7 @@
 
 #include "debug.h"
 
-Image *ResizeGrip::gripImage = 0;
+Image *ResizeGrip::gripImage = nullptr;
 int ResizeGrip::mInstances = 0;
 float ResizeGrip::mAlpha = 1.0;
 
@@ -69,7 +69,7 @@ ResizeGrip::~ResizeGrip()
     if (mInstances == 0 && gripImage)
     {
         gripImage->decRef();
-        gripImage = 0;
+        gripImage = nullptr;
     }
 }
 
diff --git a/src/gui/widgets/scrollarea.cpp b/src/gui/widgets/scrollarea.cpp
index 3204028dc..0ec4a2027 100644
--- a/src/gui/widgets/scrollarea.cpp
+++ b/src/gui/widgets/scrollarea.cpp
@@ -111,7 +111,7 @@ ScrollArea::~ScrollArea()
             buttons[RIGHT][1]->decRef();
     }
     delete mVertexes;
-    mVertexes = 0;
+    mVertexes = nullptr;
 }
 
 void ScrollArea::init()
@@ -147,7 +147,7 @@ void ScrollArea::init()
                 }
                 else
                 {
-                    background.grid[a] = 0;
+                    background.grid[a] = nullptr;
                 }
                 a++;
             }
@@ -179,7 +179,7 @@ void ScrollArea::init()
                 }
                 else
                 {
-                    vMarker.grid[a] = 0;
+                    vMarker.grid[a] = nullptr;
                 }
                 if (vscrollHi)
                 {
@@ -192,7 +192,7 @@ void ScrollArea::init()
                 }
                 else
                 {
-                    vMarkerHi.grid[a] = 0;
+                    vMarkerHi.grid[a] = nullptr;
                 }
                 a++;
             }
diff --git a/src/gui/widgets/setupitem.cpp b/src/gui/widgets/setupitem.cpp
index 698e133dd..8081f5d7b 100644
--- a/src/gui/widgets/setupitem.cpp
+++ b/src/gui/widgets/setupitem.cpp
@@ -53,7 +53,7 @@ SetupItem::SetupItem(std::string text, std::string description,
     mUseDefault(false),
     mValue(""),
     mDefault(""),
-    mWidget(0),
+    mWidget(nullptr),
     mValueType(VBOOL)
 {
 }
@@ -70,7 +70,7 @@ SetupItem::SetupItem(std::string text, std::string description,
     mUseDefault(true),
     mValue(""),
     mDefault(def),
-    mWidget(0),
+    mWidget(nullptr),
     mValueType(VBOOL)
 {
 }
@@ -184,7 +184,7 @@ SetupItemCheckBox::SetupItemCheckBox(std::string text, std::string description,
 
 SetupItemCheckBox::~SetupItemCheckBox()
 {
-    mWidget = 0;
+    mWidget = nullptr;
 }
 
 void SetupItemCheckBox::createControls()
@@ -225,11 +225,11 @@ SetupItemTextField::SetupItemTextField(std::string text,
                                        std::string eventName,
                                        bool mainConfig) :
     SetupItem(text, description, keyName, parent, eventName, mainConfig),
-    mHorizont(0),
-    mLabel(0),
-    mTextField(0),
-    mButton(0),
-    mEditDialog(0)
+    mHorizont(nullptr),
+    mLabel(nullptr),
+    mTextField(nullptr),
+    mButton(nullptr),
+    mEditDialog(nullptr)
 {
     mValueType = VSTR;
     createControls();
@@ -242,11 +242,11 @@ SetupItemTextField::SetupItemTextField(std::string text,
                                        std::string eventName, std::string def,
                                        bool mainConfig) :
     SetupItem(text, description, keyName, parent, eventName, def, mainConfig),
-    mHorizont(0),
-    mLabel(0),
-    mTextField(0),
-    mButton(0),
-    mEditDialog(0)
+    mHorizont(nullptr),
+    mLabel(nullptr),
+    mTextField(nullptr),
+    mButton(nullptr),
+    mEditDialog(nullptr)
 {
     mValueType = VSTR;
     createControls();
@@ -254,11 +254,11 @@ SetupItemTextField::SetupItemTextField(std::string text,
 
 SetupItemTextField::~SetupItemTextField()
 {
-    mHorizont = 0;
-    mWidget = 0;
-    mTextField = 0;
-    mLabel = 0;
-    mButton = 0;
+    mHorizont = nullptr;
+    mWidget = nullptr;
+    mTextField = nullptr;
+    mLabel = nullptr;
+    mButton = nullptr;
 }
 
 void SetupItemTextField::createControls()
@@ -318,7 +318,7 @@ void SetupItemTextField::action(const gcn::ActionEvent &event)
     else if (event.getId() == mEventName + "_EDIT_OK")
     {
         mTextField->setText(mEditDialog->getMsg());
-        mEditDialog = 0;
+        mEditDialog = nullptr;
     }
 }
 
@@ -339,13 +339,13 @@ SetupItemIntTextField::SetupItemIntTextField(std::string text,
                                              int min, int max,
                                              bool mainConfig) :
     SetupItem(text, description, keyName, parent, eventName, mainConfig),
-    mHorizont(0),
-    mLabel(0),
-    mTextField(0),
-    mButton(0),
+    mHorizont(nullptr),
+    mLabel(nullptr),
+    mTextField(nullptr),
+    mButton(nullptr),
     mMin(min),
     mMax(max),
-    mEditDialog(0)
+    mEditDialog(nullptr)
 {
     mValueType = VSTR;
     createControls();
@@ -360,13 +360,13 @@ SetupItemIntTextField::SetupItemIntTextField(std::string text,
                                              std::string def,
                                              bool mainConfig) :
     SetupItem(text, description, keyName, parent, eventName, def, mainConfig),
-    mHorizont(0),
-    mLabel(0),
-    mTextField(0),
-    mButton(0),
+    mHorizont(nullptr),
+    mLabel(nullptr),
+    mTextField(nullptr),
+    mButton(nullptr),
     mMin(min),
     mMax(max),
-    mEditDialog(0)
+    mEditDialog(nullptr)
 {
     mValueType = VSTR;
     createControls();
@@ -374,11 +374,11 @@ SetupItemIntTextField::SetupItemIntTextField(std::string text,
 
 SetupItemIntTextField::~SetupItemIntTextField()
 {
-    mHorizont = 0;
-    mWidget = 0;
-    mTextField = 0;
-    mLabel = 0;
-    mButton = 0;
+    mHorizont = nullptr;
+    mWidget = nullptr;
+    mTextField = nullptr;
+    mLabel = nullptr;
+    mButton = nullptr;
 }
 
 void SetupItemIntTextField::createControls()
@@ -441,7 +441,7 @@ void SetupItemIntTextField::action(const gcn::ActionEvent &event)
     else if (event.getId() == mEventName + "_EDIT_OK")
     {
         mTextField->setValue(atoi(mEditDialog->getMsg().c_str()));
-        mEditDialog = 0;
+        mEditDialog = nullptr;
     }
 }
 
@@ -459,7 +459,7 @@ void SetupItemIntTextField::apply(std::string eventName)
 SetupItemLabel::SetupItemLabel(std::string text, std::string description,
                                SetupTabScroll *parent, bool separator) :
     SetupItem(text, description, "", parent, "", "", true),
-    mLabel(0),
+    mLabel(nullptr),
     mIsSeparator(separator)
 {
     mValueType = VNONE;
@@ -468,8 +468,8 @@ SetupItemLabel::SetupItemLabel(std::string text, std::string description,
 
 SetupItemLabel::~SetupItemLabel()
 {
-    mWidget = 0;
-    mLabel = 0;
+    mWidget = nullptr;
+    mLabel = nullptr;
 }
 
 void SetupItemLabel::createControls()
@@ -517,10 +517,10 @@ SetupItemDropDown::SetupItemDropDown(std::string text,
                                      gcn::ListModel *model,
                                      bool mainConfig) :
     SetupItem(text, description, keyName, parent, eventName, mainConfig),
-    mHorizont(0),
-    mLabel(0),
+    mHorizont(nullptr),
+    mLabel(nullptr),
     mModel(model),
-    mDropDown(0)
+    mDropDown(nullptr)
 {
     mValueType = VSTR;
     createControls();
@@ -535,10 +535,10 @@ SetupItemDropDown::SetupItemDropDown(std::string text,
                                      std::string def,
                                      bool mainConfig) :
     SetupItem(text, description, keyName, parent, eventName, def, mainConfig),
-    mHorizont(0),
-    mLabel(0),
+    mHorizont(nullptr),
+    mLabel(nullptr),
     mModel(model),
-    mDropDown(0)
+    mDropDown(nullptr)
 {
     mValueType = VSTR;
     createControls();
@@ -546,11 +546,11 @@ SetupItemDropDown::SetupItemDropDown(std::string text,
 
 SetupItemDropDown::~SetupItemDropDown()
 {
-    mHorizont = 0;
-    mWidget = 0;
-    mModel = 0;
-    mDropDown = 0;
-    mLabel = 0;
+    mHorizont = nullptr;
+    mWidget = nullptr;
+    mModel = nullptr;
+    mDropDown = nullptr;
+    mLabel = nullptr;
 }
 
 void SetupItemDropDown::createControls()
diff --git a/src/gui/widgets/setuptabscroll.cpp b/src/gui/widgets/setuptabscroll.cpp
index e9917b090..4fb092070 100644
--- a/src/gui/widgets/setuptabscroll.cpp
+++ b/src/gui/widgets/setuptabscroll.cpp
@@ -43,10 +43,10 @@ SetupTabScroll::SetupTabScroll() :
 
 SetupTabScroll::~SetupTabScroll()
 {
-    mScroll = 0;
+    mScroll = nullptr;
 
     delete mContainer;
-    mContainer = 0;
+    mContainer = nullptr;
 
     std::set<SetupItem*>::iterator it = mAllItems.begin();
     std::set<SetupItem*>::iterator it_end = mAllItems.end();
diff --git a/src/gui/widgets/shopitems.cpp b/src/gui/widgets/shopitems.cpp
index e15445b77..d3aac5c56 100644
--- a/src/gui/widgets/shopitems.cpp
+++ b/src/gui/widgets/shopitems.cpp
@@ -75,7 +75,7 @@ void ShopItems::addItemNoDup(int id, unsigned char color,
 void ShopItems::addItem2(int inventoryIndex, int id, unsigned char color,
                          int quantity, int price)
 {
-    ShopItem *item = 0;
+    ShopItem *item = nullptr;
     if (mMergeDuplicates)
         item = findItem(id, color);
 
@@ -93,7 +93,7 @@ void ShopItems::addItem2(int inventoryIndex, int id, unsigned char color,
 ShopItem *ShopItems::at(unsigned int i) const
 {
     if (i >= mShopItems.size())
-        return 0;
+        return nullptr;
 
     return mShopItems.at(i);
 }
@@ -137,5 +137,5 @@ ShopItem *ShopItems::findItem(int id, unsigned char color) const
         ++it;
     }
 
-    return 0;
+    return nullptr;
 }
diff --git a/src/gui/widgets/shoplistbox.cpp b/src/gui/widgets/shoplistbox.cpp
index 793491808..b649a81ef 100644
--- a/src/gui/widgets/shoplistbox.cpp
+++ b/src/gui/widgets/shoplistbox.cpp
@@ -47,7 +47,7 @@ float ShopListBox::mAlpha = 1.0;
 ShopListBox::ShopListBox(gcn::ListModel *listModel):
     ListBox(listModel),
     mPlayerMoney(0),
-    mShopItems(0)
+    mShopItems(nullptr)
 {
     mRowHeight = getFont()->getHeight();
     init();
diff --git a/src/gui/widgets/shortcutcontainer.cpp b/src/gui/widgets/shortcutcontainer.cpp
index 9fd9b26c6..36f88da08 100644
--- a/src/gui/widgets/shortcutcontainer.cpp
+++ b/src/gui/widgets/shortcutcontainer.cpp
@@ -33,7 +33,7 @@
 float ShortcutContainer::mAlpha = 1.0;
 
 ShortcutContainer::ShortcutContainer():
-    mBackgroundImg(0),
+    mBackgroundImg(nullptr),
     mMaxItems(0),
     mBoxWidth(1),
     mBoxHeight(1),
diff --git a/src/gui/widgets/slider.cpp b/src/gui/widgets/slider.cpp
index d29c2211f..3822d40c9 100644
--- a/src/gui/widgets/slider.cpp
+++ b/src/gui/widgets/slider.cpp
@@ -101,9 +101,9 @@ void Slider::init()
         }
         else
         {
-            hStart = 0;
-            hMid = 0;
-            hEnd = 0;
+            hStart = nullptr;
+            hMid = nullptr;
+            hEnd = nullptr;
         }
         if (sliderHi)
         {
@@ -113,9 +113,9 @@ void Slider::init()
         }
         else
         {
-            hStartHi = 0;
-            hMidHi = 0;
-            hEndHi = 0;
+            hStartHi = nullptr;
+            hMidHi = nullptr;
+            hEndHi = nullptr;
         }
 
         x = 6; y = 8;
@@ -123,11 +123,11 @@ void Slider::init()
         if (slider)
             hGrip = slider->getSubImage(x, y, w, h);
         else
-            hGrip = 0;
+            hGrip = nullptr;
         if (sliderHi)
             hGripHi = sliderHi->getSubImage(x, y, w, h);
         else
-            hGripHi = 0;
+            hGripHi = nullptr;
 
         x = 0; y = 6;
         w = 6; h = 21;
@@ -140,9 +140,9 @@ void Slider::init()
         }
         else
         {
-            vStart = 0;
-            vMid = 0;
-            vEnd = 0;
+            vStart = nullptr;
+            vMid = nullptr;
+            vEnd = nullptr;
         }
         if (sliderHi)
         {
@@ -152,9 +152,9 @@ void Slider::init()
         }
         else
         {
-            vStartHi = 0;
-            vMidHi = 0;
-            vEndHi = 0;
+            vStartHi = nullptr;
+            vMidHi = nullptr;
+            vEndHi = nullptr;
         }
 
         x = 6; y = 8;
@@ -162,12 +162,12 @@ void Slider::init()
         if (slider)
             vGrip = slider->getSubImage(x, y, w, h);
         else
-            vGrip = 0;
+            vGrip = nullptr;
 
         if (sliderHi)
             vGripHi = sliderHi->getSubImage(x, y, w, h);
         else
-            vGripHi = 0;
+            vGripHi = nullptr;
 
         if (slider)
             slider->decRef();
diff --git a/src/gui/widgets/spellshortcutcontainer.cpp b/src/gui/widgets/spellshortcutcontainer.cpp
index 6317dd56f..5c4dbc9a1 100644
--- a/src/gui/widgets/spellshortcutcontainer.cpp
+++ b/src/gui/widgets/spellshortcutcontainer.cpp
@@ -54,7 +54,7 @@
 SpellShortcutContainer::SpellShortcutContainer(unsigned number):
     ShortcutContainer(),
     mSpellClicked(false),
-    mSpellMoved(NULL),
+    mSpellMoved(nullptr),
     mNumber(number)
 {
     mBoxWidth = mBoxWidth;
@@ -88,9 +88,9 @@ SpellShortcutContainer::~SpellShortcutContainer()
 {
     if (mBackgroundImg)
         mBackgroundImg->decRef();
-    mBackgroundImg = 0;
+    mBackgroundImg = nullptr;
     delete mSpellPopup;
-    mSpellPopup = 0;
+    mSpellPopup = nullptr;
 }
 
 void SpellShortcutContainer::draw(gcn::Graphics *graphics)
@@ -251,7 +251,7 @@ void SpellShortcutContainer::mouseReleased(gcn::MouseEvent &event)
     }
     else if (event.getButton() == gcn::MouseEvent::RIGHT)
     {
-        TextCommand *spell = NULL;
+        TextCommand *spell = nullptr;
         if (itemId >= 0)
             spell = spellManager->getSpell(itemId);
 
diff --git a/src/gui/widgets/tab.cpp b/src/gui/widgets/tab.cpp
index 530f1ac82..8e4b1fe6f 100644
--- a/src/gui/widgets/tab.cpp
+++ b/src/gui/widgets/tab.cpp
@@ -91,7 +91,7 @@ Tab::~Tab()
             for_each(tabImg[mode].grid, tabImg[mode].grid + 9, dtor<Image*>());
     }
     delete mVertexes;
-    mVertexes = 0;
+    mVertexes = nullptr;
 }
 
 void Tab::init()
diff --git a/src/gui/widgets/tabbedarea.cpp b/src/gui/widgets/tabbedarea.cpp
index 47b02c925..fb9279343 100644
--- a/src/gui/widgets/tabbedarea.cpp
+++ b/src/gui/widgets/tabbedarea.cpp
@@ -46,15 +46,15 @@ TabbedArea::TabbedArea()
     mArrowButton[0] = new Button("<", "shift_left", this);
     mArrowButton[1] = new Button(">", "shift_right", this);
 
-    widgetResized(NULL);
+    widgetResized(nullptr);
 }
 
 TabbedArea::~TabbedArea()
 {
     delete mArrowButton[0];
-    mArrowButton[0] = 0;
+    mArrowButton[0] = nullptr;
     delete mArrowButton[1];
-    mArrowButton[1] = 0;
+    mArrowButton[1] = nullptr;
 }
 
 void TabbedArea::enableScrollButtons(bool enable)
@@ -90,7 +90,7 @@ Tab *TabbedArea::getTab(const std::string &name) const
 
         ++itr;
     }
-    return NULL;
+    return nullptr;
 }
 
 void TabbedArea::draw(gcn::Graphics *graphics)
@@ -112,7 +112,7 @@ gcn::Widget *TabbedArea::getWidget(const std::string &name) const
         ++itr;
     }
 
-    return NULL;
+    return nullptr;
 }
 
 gcn::Widget *TabbedArea::getCurrentWidget()
@@ -122,7 +122,7 @@ gcn::Widget *TabbedArea::getCurrentWidget()
     if (tab)
         return getWidget(tab->getCaption());
     else
-        return NULL;
+        return nullptr;
 }
 
 void TabbedArea::addTab(gcn::Tab* tab, gcn::Widget* widget)
@@ -192,7 +192,7 @@ void TabbedArea::removeTab(gcn::Tab *tab)
 
     if (tabIndexToBeSelected == -1)
     {
-        mSelectedTab = 0;
+        mSelectedTab = nullptr;
         mWidgetContainer->clear();
     }
     else
@@ -238,7 +238,7 @@ void TabbedArea::setSelectedTab(gcn::Tab *tab)
     if (newTab)
         newTab->setCurrent();
 
-    widgetResized(NULL);
+    widgetResized(nullptr);
 }
 
 void TabbedArea::setSelectedTab(const std::string &name)
@@ -266,7 +266,7 @@ void TabbedArea::widgetResized(const gcn::Event &event A_UNUSED)
     if (w)
     {
         int newScroll = 0;
-        ScrollArea* scr = 0;
+        ScrollArea* scr = nullptr;
         if (mFollowDownScroll && height != 0)
         {
             gcn::Rectangle rect = w->getDimension();
@@ -444,14 +444,14 @@ void TabbedArea::updateArrowEnableState()
 Tab *TabbedArea::getTabByIndex(int index) const
 {
     if (index < 0 || index >= static_cast<int>(mTabs.size()))
-        return 0;
+        return nullptr;
     return static_cast<Tab*>(mTabs[index].first);
 }
 
 gcn::Widget *TabbedArea::getWidgetByIndex(int index) const
 {
     if (index < 0 || index >= static_cast<int>(mTabs.size()))
-        return 0;
+        return nullptr;
     return mTabs[index].second;
 }
 
diff --git a/src/gui/widgets/tablemodel.cpp b/src/gui/widgets/tablemodel.cpp
index 6c932a411..f54b4281a 100644
--- a/src/gui/widgets/tablemodel.cpp
+++ b/src/gui/widgets/tablemodel.cpp
@@ -68,7 +68,7 @@ StaticTableModel::StaticTableModel(int row, int column) :
     mColumns(column),
     mHeight(1)
 {
-    mTableModel.resize(row * column, NULL);
+    mTableModel.resize(row * column, nullptr);
     mWidths.resize(column, 1);
 }
 
@@ -82,7 +82,7 @@ void StaticTableModel::resize()
 {
     mRows = getRows();
     mColumns = getColumns();
-    mTableModel.resize(mRows * mColumns, NULL);
+    mTableModel.resize(mRows * mColumns, nullptr);
 }
 
 void StaticTableModel::set(int row, int column, gcn::Widget *widget)
diff --git a/src/gui/widgets/textfield.cpp b/src/gui/widgets/textfield.cpp
index 6ce4cbf3b..b4584947a 100644
--- a/src/gui/widgets/textfield.cpp
+++ b/src/gui/widgets/textfield.cpp
@@ -86,7 +86,7 @@ TextField::TextField(const std::string &text, bool loseFocusOnTab,
                 }
                 else
                 {
-                    skin.grid[a] = 0;
+                    skin.grid[a] = nullptr;
                 }
                 a++;
             }
diff --git a/src/gui/widgets/textfield.h b/src/gui/widgets/textfield.h
index 93f970168..e530cfef2 100644
--- a/src/gui/widgets/textfield.h
+++ b/src/gui/widgets/textfield.h
@@ -25,6 +25,8 @@
 
 #include <guichan/widgets/textfield.hpp>
 
+#include "localconsts.h"
+
 class ImageRect;
 class TextField;
 
@@ -40,7 +42,7 @@ class TextField : public gcn::TextField
          * Constructor, initializes the text field with the given string.
          */
         TextField(const std::string &text = "", bool loseFocusOnTab = true,
-                  gcn::ActionListener* listener = NULL,
+                  gcn::ActionListener* listener = nullptr,
                   std::string eventId = "", bool sendAlwaysEvents = false);
 
         ~TextField();
diff --git a/src/gui/widgets/textpreview.cpp b/src/gui/widgets/textpreview.cpp
index 07cf19b61..9be2d5b3f 100644
--- a/src/gui/widgets/textpreview.cpp
+++ b/src/gui/widgets/textpreview.cpp
@@ -44,7 +44,7 @@ TextPreview::TextPreview(const std::string &text):
     mTextAlpha = false;
     mFont = gui->getFont();
     mTextColor = &Theme::getThemeColor(Theme::TEXT);
-    mTextBGColor = NULL;
+    mTextBGColor = nullptr;
     mBGColor = &Theme::getThemeColor(Theme::BACKGROUND);
     mOpaque = false;
 }
diff --git a/src/gui/widgets/window.cpp b/src/gui/widgets/window.cpp
index c52bf744e..273695a1a 100644
--- a/src/gui/widgets/window.cpp
+++ b/src/gui/widgets/window.cpp
@@ -49,9 +49,9 @@ int Window::mouseResize = 0;
 Window::Window(const std::string &caption, bool modal, Window *parent,
                std::string skin):
     gcn::Window(caption),
-    mGrip(0),
+    mGrip(nullptr),
     mParent(parent),
-    mLayout(NULL),
+    mLayout(nullptr),
     mWindowName("window"),
     mShowTitle(true),
     mModal(modal),
@@ -91,7 +91,7 @@ Window::Window(const std::string &caption, bool modal, Window *parent,
     }
     else
     {
-        mSkin = 0;
+        mSkin = nullptr;
     }
 
     // Add this window to the window container
@@ -118,7 +118,7 @@ Window::~Window()
     saveWindowState();
 
     delete mLayout;
-    mLayout = 0;
+    mLayout = nullptr;
 
     while (!mWidgets.empty())
         delete mWidgets.front();
@@ -127,7 +127,7 @@ Window::~Window()
 
     removeWidgetListener(this);
     delete mVertexes;
-    mVertexes = 0;
+    mVertexes = nullptr;
 
     instances--;
 
@@ -135,7 +135,7 @@ Window::~Window()
     {
         if (Theme::instance())
             Theme::instance()->unload(mSkin);
-        mSkin = 0;
+        mSkin = nullptr;
     }
 }
 
@@ -348,7 +348,7 @@ void Window::setResizable(bool r)
     {
         remove(mGrip);
         delete mGrip;
-        mGrip = 0;
+        mGrip = nullptr;
     }
 }
 
@@ -947,7 +947,7 @@ void Window::reflowLayout(int w, int h)
 
     mLayout->reflow(w, h);
     delete mLayout;
-    mLayout = 0;
+    mLayout = nullptr;
     setContentSize(w, h);
 }
 
diff --git a/src/gui/widgets/window.h b/src/gui/widgets/window.h
index ffc27ab10..5ace2328e 100644
--- a/src/gui/widgets/window.h
+++ b/src/gui/widgets/window.h
@@ -25,6 +25,7 @@
 
 #include "graphics.h"
 #include "guichanfwd.h"
+#include "localconsts.h"
 
 #include <guichan/widgetlistener.hpp>
 
@@ -65,7 +66,7 @@ class Window : public gcn::Window, gcn::WidgetListener
          * @param skin    The location where the window's skin XML can be found.
          */
         Window(const std::string &caption = "Window", bool modal = false,
-               Window *parent = NULL, std::string skin = "");
+               Window *parent = nullptr, std::string skin = "");
 
         /**
          * Destructor. Deletes all the added widgets.
diff --git a/src/gui/widgets/windowcontainer.cpp b/src/gui/widgets/windowcontainer.cpp
index 5a3c16037..34a6b68c7 100644
--- a/src/gui/widgets/windowcontainer.cpp
+++ b/src/gui/widgets/windowcontainer.cpp
@@ -26,7 +26,7 @@
 
 #include "debug.h"
 
-WindowContainer *windowContainer = NULL;
+WindowContainer *windowContainer = nullptr;
 
 void WindowContainer::logic()
 {
diff --git a/src/gui/worldselectdialog.cpp b/src/gui/worldselectdialog.cpp
index b4f697ba3..3749049fe 100644
--- a/src/gui/worldselectdialog.cpp
+++ b/src/gui/worldselectdialog.cpp
@@ -140,7 +140,7 @@ void WorldSelectDialog::keyPressed(gcn::KeyEvent &keyEvent)
     gcn::Key key = keyEvent.getKey();
 
     if (key.getValue() == Key::ESCAPE)
-        action(gcn::ActionEvent(NULL, mChangeLoginButton->getActionEventId()));
+        action(gcn::ActionEvent(nullptr, mChangeLoginButton->getActionEventId()));
     else if (key.getValue() == Key::ENTER)
-        action(gcn::ActionEvent(NULL, mChooseWorld->getActionEventId()));
+        action(gcn::ActionEvent(nullptr, mChooseWorld->getActionEventId()));
 }