Konsole : added support for mouse wheel events in the alternate screen. This allows scrolling within vim, less and similar applications.

This resolves bug 2597.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>

konsole/konsole/TEWidget.cpp

@@ -340,6 +340,8 @@ TEWidget::TEWidget(TQWidget *parent, const char *name)
 ,font_h(1)
 ,font_w(1)
 ,font_a(1)
+,screen_num(0)
+,screen(NULL)
 ,lines(1)
 ,columns(1)
 ,contentHeight(1)
@@ -1694,7 +1696,22 @@ void TEWidget::wheelEvent( TQWheelEvent* ev )
     return;
 
   if ( mouse_marks )
-    TQApplication::sendEvent(scrollbar, ev);
+  {
+		if (!screen || screen->hasScroll() || (scrollbar->maxValue() == 0 && screen_num == 0))
+		{
+		  // Send event to scroll bar
+    	TQApplication::sendEvent(scrollbar, ev);
+    }
+		else
+		{
+		  // Terminal window can not be scrolled, so emulate key up/key down when mouse wheel is used
+		  TQKeyEvent ke(TQEvent::KeyPress, ev->delta() > 0 ? TQt::Key_Up : TQt::Key_Down, 0, TQt::NoButton);
+      for (int i = 0;  i < TQApplication::wheelScrollLines();  ++i)
+      {
+  	    emit keyPressedSignal(&ke);
+  	  }
+		}
+	}
   else
   {
     TQPoint tL  = contentsRect().topLeft();

konsole/konsole/TEWidget.h

@@ -32,6 +32,7 @@
 #include <tdepopupmenu.h>
 
 #include "TECommon.h"
+#include "TEScreen.h"
 
 
 extern unsigned short vt100_graphics[32];
@@ -142,6 +143,8 @@ public:
 
     void setRim(int rim) { rimX=rim; rimY=rim; }
 
+    void setScreen(int num, TEScreen *scr) { screen_num = num & 0x01; screen = scr; }
+
 public slots:
 
     void setSelectionEnd();
@@ -241,6 +244,10 @@ private:
     int bX;    // offset
     int bY;    // offset
 
+    // Required to handle mouse wheel events correctly in all cases
+		int screen_num;    // Screen number (0 or 1)
+		TEScreen *screen;  // Pointer to current screen. No ownership!!
+
     int lines;
     int columns;
     int contentHeight;

konsole/konsole/TEmulation.cpp

@@ -197,6 +197,7 @@ void TEmulation::setScreen(int n)
 {
   TEScreen *old = scr;
   scr = screen[n&1];
+  gui->setScreen(n&1, scr);
   if (scr != old)
      old->setBusySelecting(false);
 }