From a54c5dfccb56dc8996f5c7b2a2299a2cb2257f08 Mon Sep 17 00:00:00 2001
From: Andrei Karas <akaras@inbox.ru>
Date: Fri, 8 Apr 2011 04:44:27 +0300
Subject: Add ability to tabbedarea follow vertical scrroll bar position with
 max value.

---
 src/gui/chatwindow.cpp         |  1 +
 src/gui/widgets/tabbedarea.cpp | 35 +++++++++++++++++++++++++++++------
 src/gui/widgets/tabbedarea.h   |  7 +++++++
 3 files changed, 37 insertions(+), 6 deletions(-)

diff --git a/src/gui/chatwindow.cpp b/src/gui/chatwindow.cpp
index c3e85bdac..1142636b4 100644
--- a/src/gui/chatwindow.cpp
+++ b/src/gui/chatwindow.cpp
@@ -175,6 +175,7 @@ ChatWindow::ChatWindow():
 
     mChatTabs = new TabbedArea;
     mChatTabs->enableScrollButtons(true);
+    mChatTabs->setFollowDownScroll(true);
 
     mChatInput = new ChatInput(mChatTabs);
     mChatInput->setActionEventId("chatinput");
diff --git a/src/gui/widgets/tabbedarea.cpp b/src/gui/widgets/tabbedarea.cpp
index 6b90cb381..bd43e4dc7 100644
--- a/src/gui/widgets/tabbedarea.cpp
+++ b/src/gui/widgets/tabbedarea.cpp
@@ -22,18 +22,21 @@
 
 #include "gui/widgets/tabbedarea.h"
 
+#include "gui/widgets/scrollarea.h"
 #include "gui/widgets/tab.h"
 
 #include "log.h"
 
 #include <guichan/widgets/container.hpp>
 
-TabbedArea::TabbedArea() : gcn::TabbedArea(),
-                           mTabsWidth(0),
-                           mVisibleTabsWidth(0),
-                           mTabScrollIndex(0),
-                           mEnableScrollButtons(false),
-                           mRightMargin(0)
+TabbedArea::TabbedArea()
+    : gcn::TabbedArea(),
+      mTabsWidth(0),
+      mVisibleTabsWidth(0),
+      mTabScrollIndex(0),
+      mEnableScrollButtons(false),
+      mRightMargin(0),
+      mFollowDownScroll(false)
 {
     mWidgetContainer->setOpaque(false);
     addWidgetListener(this);
@@ -246,7 +249,27 @@ void TabbedArea::widgetResized(const gcn::Event &event _UNUSED_)
 
     gcn::Widget *w = getCurrentWidget();
     if (w)
+    {
+        int newScroll = 0;
+        ScrollArea* scr = 0;
+        if (mFollowDownScroll && height != 0)
+        {
+            gcn::Rectangle rect = w->getDimension();
+            if (rect.height != 0 && rect.height > height)
+            {
+                scr = dynamic_cast<ScrollArea*>(w);
+                if (scr && scr->getVerticalScrollAmount()
+                    == scr->getVerticalMaxScroll())
+                {
+                    newScroll = scr->getVerticalScrollAmount()
+                        + rect.height - height;
+                }
+            }
+        }
         w->setSize(width, height);
+        if (scr && newScroll)
+            scr->setVerticalScrollAmount(newScroll);
+    }
 
     if (mArrowButton[1])
     {
diff --git a/src/gui/widgets/tabbedarea.h b/src/gui/widgets/tabbedarea.h
index 0c2903777..b48f83240 100644
--- a/src/gui/widgets/tabbedarea.h
+++ b/src/gui/widgets/tabbedarea.h
@@ -139,6 +139,12 @@ class TabbedArea : public gcn::TabbedArea, public gcn::WidgetListener
         int getRightMargin()
         { return mRightMargin; }
 
+        void setFollowDownScroll(bool n)
+        { mFollowDownScroll = n; }
+
+        bool getFollowDownScroll()
+        { return mFollowDownScroll; }
+
     private:
         typedef std::vector< std::pair<gcn::Tab*, gcn::Widget*> > TabContainer;
 
@@ -181,6 +187,7 @@ class TabbedArea : public gcn::TabbedArea, public gcn::WidgetListener
 
         bool mEnableScrollButtons;
         int mRightMargin;
+        bool mFollowDownScroll;
 };
 
 #endif
-- 
cgit v1.2.3-60-g2f50