Bug 159346 part.2 Repeat scroll even if mouse cursor is outside of the pressed scrollbar button on gtk2 and qt r=enndeakin+roc

layout/xul/base/src/nsScrollbarButtonFrame.cpp

@@ -216,7 +216,9 @@ void nsScrollbarButtonFrame::Notify()
 {
   // Since this is only going to get called if we're scrolling a page length
   // or a line increment, we will always use smooth scrolling.
-  if (mCursorOnThis) {
+  if (mCursorOnThis ||
+      LookAndFeel::GetInt(
+        LookAndFeel::eIntID_ScrollbarButtonAutoRepeatBehavior, 0)) {
     DoButtonAction(true);
   }
 }

widget/public/LookAndFeel.h

@@ -370,7 +370,12 @@ public:
     /**
      * Return the appropriate WindowsThemeIdentifier for the current theme.
      */
-    eIntID_WindowsThemeIdentifier
+    eIntID_WindowsThemeIdentifier,
+    /**
+     * 0: scrollbar button repeats to scroll only when cursor is on the button.
+     * 1: scrollbar button repeats to scroll even if cursor is outside of it.
+     */
+    eIntID_ScrollbarButtonAutoRepeatBehavior
   };
 
   /**

widget/src/android/nsLookAndFeel.cpp

@@ -430,6 +430,10 @@ nsLookAndFeel::GetIntImpl(IntID aID, PRInt32 &aResult)
             aResult = NS_STYLE_TEXT_DECORATION_STYLE_WAVY;
             break;
 
+        case eIntID_ScrollbarButtonAutoRepeatBehavior:
+            aResult = 0;
+            break;
+
         default:
             aResult = 0;
             rv = NS_ERROR_FAILURE;

widget/src/cocoa/nsLookAndFeel.mm

@@ -431,6 +431,9 @@ nsLookAndFeel::GetIntImpl(IntID aID, PRInt32 &aResult)
     case eIntID_SpellCheckerUnderlineStyle:
       aResult = NS_STYLE_TEXT_DECORATION_STYLE_DOTTED;
       break;
+    case eIntID_ScrollbarButtonAutoRepeatBehavior:
+      aResult = 0;
+      break;
     default:
       aResult = 0;
       res = NS_ERROR_FAILURE;

widget/src/gtk2/nsLookAndFeel.cpp

@@ -575,6 +575,9 @@ nsLookAndFeel::GetIntImpl(IntID aID, PRInt32 &aResult)
     case eIntID_MenuBarDrag:
         aResult = sMenuSupportsDrag;
         break;
+    case eIntID_ScrollbarButtonAutoRepeatBehavior:
+        aResult = 1;
+        break;
     default:
         aResult = 0;
         res     = NS_ERROR_FAILURE;

widget/src/os2/nsLookAndFeel.cpp

@@ -349,6 +349,9 @@ nsLookAndFeel::GetIntImpl(IntID aID, PRInt32 &aResult)
     case eIntID_SpellCheckerUnderlineStyle:
         aResult = NS_STYLE_TEXT_DECORATION_STYLE_WAVY;
         break;
+    case eIntID_ScrollbarButtonAutoRepeatBehavior:
+        aResult = 0;
+        break;
 
     default:
         aResult = 0;

widget/src/qt/nsLookAndFeel.cpp

@@ -408,6 +408,10 @@ nsLookAndFeel::GetIntImpl(IntID aID, PRInt32 &aResult)
       aResult = NS_STYLE_TEXT_DECORATION_STYLE_WAVY;
       break;
 
+    case eIntID_ScrollbarButtonAutoRepeatBehavior:
+      aResult = 1;
+      break;
+
     default:
       aResult = 0;
       res = NS_ERROR_FAILURE;

widget/src/windows/nsLookAndFeel.cpp

@@ -479,6 +479,9 @@ nsLookAndFeel::GetIntImpl(IntID aID, PRInt32 &aResult)
     case eIntID_SpellCheckerUnderlineStyle:
         aResult = NS_STYLE_TEXT_DECORATION_STYLE_WAVY;
         break;
+    case eIntID_ScrollbarButtonAutoRepeatBehavior:
+        aResult = 0;
+        break;
     default:
         aResult = 0;
         res = NS_ERROR_FAILURE;

widget/src/xpwidgets/nsXPLookAndFeel.cpp

@@ -125,6 +125,9 @@ nsLookAndFeelIntPref nsXPLookAndFeel::sIntPrefs[] =
   { "ui.SpellCheckerUnderlineStyle",
     eIntID_SpellCheckerUnderlineStyle,
     false, 0 },
+  { "ui.scrollbarButtonAutoRepeatBehavior",
+    eIntID_ScrollbarButtonAutoRepeatBehavior,
+    false, 0 },
 };
 
 nsLookAndFeelFloatPref nsXPLookAndFeel::sFloatPrefs[] =