Allow page up and page down to scroll the chat window, based on patch by fate.

3 files changed, 52 insertions, 10 deletions

diff --git a/src/game.cpp b/src/game.cpp
index 8096ada4..b12b114f 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -532,6 +532,22 @@ void Game::handleInput()
             }
             switch (event.key.keysym.sym)
             {
+                case SDLK_PAGEUP:
+                    if (chatWindow->isVisible())
+                    {
+                        chatWindow->scroll(-DEFAULT_CHAT_WINDOW_SCROLL);
+                        used = true;
+                    }
+                    break;
+
+                case SDLK_PAGEDOWN:
+                    if (chatWindow->isVisible())
+                    {
+                        chatWindow->scroll(DEFAULT_CHAT_WINDOW_SCROLL);
+                        used = true;
+                    }
+                    break;
+
                 case SDLK_F1:
                     // In-game Help
                     if (helpWindow->isVisible())
diff --git a/src/gui/chat.cpp b/src/gui/chat.cpp
index 8b53ef98..5e3aaf60 100644
--- a/src/gui/chat.cpp
+++ b/src/gui/chat.cpp
@@ -411,6 +411,19 @@ ChatWindow::const_msg(CHATSKILL act)
 }
 
 void
+ChatWindow::scroll(int amount)
+{
+    if (!isVisible())
+        return;
+
+    int range = mScrollArea->getHeight() / 8 * amount;
+    gcn::Rectangle scr;
+    scr.y = mScrollArea->getVerticalScrollAmount() + range;
+    scr.height = abs(range);
+    mTextOutput->showPart(scr);
+}
+
+void
 ChatWindow::keyPressed(gcn::KeyEvent &event)
 {
     if (event.getKey().getValue() == gcn::Key::DOWN &&
@@ -446,11 +459,13 @@ ChatWindow::setInputText(std::string input_str)
 void
 ChatWindow::setVisible(bool isVisible)
 {
-     Window::setVisible(isVisible);
+    Window::setVisible(isVisible);
 
-     /*
-      * For whatever reason, if setVisible is called, the mTmpVisible effect
-      * should be disabled.
-      */
-     mTmpVisible = false;
+    /*
+     * For whatever reason, if setVisible is called, the mTmpVisible effect
+     * should be disabled.
+     */
+
+    mTmpVisible = false;
 }
+
diff --git a/src/gui/chat.h b/src/gui/chat.h
index f2e018a6..0bdc76f1 100644
--- a/src/gui/chat.h
+++ b/src/gui/chat.h
@@ -44,7 +44,7 @@ class ScrollArea;
 #define BY_SERVER     3
 
 #define ACT_WHISPER   4   // getting whispered at
-#define ACT_IS        5   // equivalent to "/me" in irc
+#define ACT_IS        5   // equivalent to "/me" on IRC
 
 #define BY_LOGGER     6
 
@@ -99,7 +99,9 @@ class ScrollArea;
 #define RFAIL_GENERIC     0x0a
 
 /** should always be zero if failed */
-#define SKILL_FAILED    0x00
+#define SKILL_FAILED      0x00
+
+#define DEFAULT_CHAT_WINDOW_SCROLL 7 // 1 means `1/8th of the window size'.
 
 struct CHATSKILL
 {
@@ -157,7 +159,7 @@ class ChatWindow : public Window, public gcn::ActionListener,
          */
         bool isInputFocused();
 
-        /*
+        /**
          * Determines whether to send a command or an ordinary message, then
          * contructs packets & sends them.
          *
@@ -196,6 +198,16 @@ class ChatWindow : public Window, public gcn::ActionListener,
         void
         setVisible(bool visible);
 
+       /**
+        * Scrolls the chat window
+        *
+        * @param amount direction and amount to scroll.  Negative numbers scroll
+        * up, positive numbers scroll down.  The absolute amount indicates the
+        * amount of 1/8ths of chat window real estate that should be scrolled.
+        */
+        void
+        scroll(int amount);
+
     private:
         Network *mNetwork;
         bool mTmpVisible;
@@ -224,4 +236,3 @@ class ChatWindow : public Window, public gcn::ActionListener,
 extern ChatWindow *chatWindow;
 
 #endif
-