Dispatch (WIN32 only) and handle a new cross platform message NS_SYSCOLORCHANGE. bug 143174. r=rods sr=roc

layout/base/nsPresContext.cpp

@@ -1775,6 +1775,28 @@ nsPresContext::ThemeChanged()
   return mShell->ReconstructStyleData(PR_FALSE);
 }
 
+NS_IMETHODIMP
+nsPresContext::SysColorChanged()
+{
+  if (mLookAndFeel) {
+     // Don't use the cached values for the system colors
+    mLookAndFeel->LookAndFeelChanged();
+  }
+   
+  // Reset default background and foreground colors for the document since
+  // they may be using system colors
+  GetDocumentColorPreferences();
+
+  // Clear out all of the style data since it may contain RGB values
+  // which originated from system colors.
+  if (mShell) {
+    // Clear out all our style data.
+    nsCOMPtr<nsIStyleSet> set;
+    mShell->GetStyleSet(getter_AddRefs(set));
+    set->ClearStyleData(this, nsnull, nsnull);
+  }
+  return NS_OK;
+}
 
 #ifdef MOZ_REFLOW_PERF
 NS_IMETHODIMP

layout/base/nsPresContext.h

@@ -535,6 +535,11 @@ public:
    */
   NS_IMETHOD ThemeChanged() = 0;
 
+  /*
+   * Notify the pres context that a system color has changed
+   */
+  NS_IMETHOD SysColorChanged() = 0;
+
 #ifdef MOZ_REFLOW_PERF
   NS_IMETHOD CountReflows(const char * aName, PRUint32 aType, nsIFrame * aFrame) = 0;
   NS_IMETHOD PaintCount(const char * aName, nsIRenderingContext* aRendingContext, nsIFrame * aFrame, PRUint32 aColor) = 0;

layout/base/nsPresShell.cpp

@@ -5922,6 +5922,25 @@ PresShell::HandleEvent(nsIView         *aView,
   if (aEvent->message == NS_THEMECHANGED && mPresContext)
     return mPresContext->ThemeChanged();
 
+  // Check for a system color change up front, since the frame type is irrelevenat
+  if ((aEvent->message == NS_SYSCOLORCHANGED) && mPresContext) {
+    nsIViewManager *vm;
+    if ((NS_SUCCEEDED(GetViewManager(&vm))) && vm) {
+      // Only dispatch system color change when the message originates from
+      // from the root views widget. This is necessary to prevent us from 
+      // dispatching the SysColorChanged notification for each child window 
+      // which may be redundant.
+      nsIView *view;
+      vm->GetRootView(view);
+      if (view == aView) {
+        aHandled = PR_TRUE;
+        *aEventStatus = nsEventStatus_eConsumeDoDefault;
+        return mPresContext->SysColorChanged();
+      }
+    }
+    return NS_OK;
+  }
+
   aView->GetClientData(clientData);
   frame = (nsIFrame *)clientData;
 

layout/base/public/nsIPresContext.h

@@ -535,6 +535,11 @@ public:
    */
   NS_IMETHOD ThemeChanged() = 0;
 
+  /*
+   * Notify the pres context that a system color has changed
+   */
+  NS_IMETHOD SysColorChanged() = 0;
+
 #ifdef MOZ_REFLOW_PERF
   NS_IMETHOD CountReflows(const char * aName, PRUint32 aType, nsIFrame * aFrame) = 0;
   NS_IMETHOD PaintCount(const char * aName, nsIRenderingContext* aRendingContext, nsIFrame * aFrame, PRUint32 aColor) = 0;

layout/base/public/nsPresContext.h

@@ -535,6 +535,11 @@ public:
    */
   NS_IMETHOD ThemeChanged() = 0;
 
+  /*
+   * Notify the pres context that a system color has changed
+   */
+  NS_IMETHOD SysColorChanged() = 0;
+
 #ifdef MOZ_REFLOW_PERF
   NS_IMETHOD CountReflows(const char * aName, PRUint32 aType, nsIFrame * aFrame) = 0;
   NS_IMETHOD PaintCount(const char * aName, nsIRenderingContext* aRendingContext, nsIFrame * aFrame, PRUint32 aColor) = 0;

layout/base/src/nsPresContext.cpp

@@ -1775,6 +1775,28 @@ nsPresContext::ThemeChanged()
   return mShell->ReconstructStyleData(PR_FALSE);
 }
 
+NS_IMETHODIMP
+nsPresContext::SysColorChanged()
+{
+  if (mLookAndFeel) {
+     // Don't use the cached values for the system colors
+    mLookAndFeel->LookAndFeelChanged();
+  }
+   
+  // Reset default background and foreground colors for the document since
+  // they may be using system colors
+  GetDocumentColorPreferences();
+
+  // Clear out all of the style data since it may contain RGB values
+  // which originated from system colors.
+  if (mShell) {
+    // Clear out all our style data.
+    nsCOMPtr<nsIStyleSet> set;
+    mShell->GetStyleSet(getter_AddRefs(set));
+    set->ClearStyleData(this, nsnull, nsnull);
+  }
+  return NS_OK;
+}
 
 #ifdef MOZ_REFLOW_PERF
 NS_IMETHODIMP

layout/base/src/nsPresContext.h

@@ -199,6 +199,7 @@ public:
 
   NS_IMETHOD GetTheme(nsITheme** aResult);
   NS_IMETHOD ThemeChanged();
+  NS_IMETHOD SysColorChanged();
 
 protected:
   nsPresContext();

layout/html/base/src/nsPresShell.cpp

@@ -5922,6 +5922,25 @@ PresShell::HandleEvent(nsIView         *aView,
   if (aEvent->message == NS_THEMECHANGED && mPresContext)
     return mPresContext->ThemeChanged();
 
+  // Check for a system color change up front, since the frame type is irrelevenat
+  if ((aEvent->message == NS_SYSCOLORCHANGED) && mPresContext) {
+    nsIViewManager *vm;
+    if ((NS_SUCCEEDED(GetViewManager(&vm))) && vm) {
+      // Only dispatch system color change when the message originates from
+      // from the root views widget. This is necessary to prevent us from 
+      // dispatching the SysColorChanged notification for each child window 
+      // which may be redundant.
+      nsIView *view;
+      vm->GetRootView(view);
+      if (view == aView) {
+        aHandled = PR_TRUE;
+        *aEventStatus = nsEventStatus_eConsumeDoDefault;
+        return mPresContext->SysColorChanged();
+      }
+    }
+    return NS_OK;
+  }
+
   aView->GetClientData(clientData);
   frame = (nsIFrame *)clientData;
 

view/src/nsViewManager.cpp

@@ -1798,7 +1798,17 @@ NS_IMETHODIMP nsViewManager::DispatchEvent(nsGUIEvent *aEvent, nsEventStatus *aS
       }
       break;
 
-
+    case NS_SYSCOLORCHANGED:
+      {
+        nsView *view = nsView::GetViewFor(aEvent->widget);
+        nsCOMPtr<nsIViewObserver> obs;
+        GetViewObserver(*getter_AddRefs(obs));
+        if (obs) {
+          PRBool handled;
+          obs->HandleEvent(view, aEvent, aStatus, PR_TRUE, handled);
+        }
+      }
+      break;
 
     default:
       {
@@ -2029,7 +2039,7 @@ nsEventStatus nsViewManager::HandleEvent(nsView* aView, nsGUIEvent* aEvent, PRBo
     }
     return status;
   }
-
+    
   nsAutoVoidArray targetViews;
   nsAutoVoidArray heldRefCountsToOtherVMs;
 

widget/public/nsGUIEvent.h

@@ -449,6 +449,11 @@ enum nsDragDropEventStatus {
 // Indicates a theme change has occurred
 #define NS_THEMECHANGED                 (NS_WINDOW_START + 41)
 
+// Indicates a System color has changed. It is the platform
+// toolkits responsibility to invalidate the window to 
+// ensure that it is drawn using the current system colors.
+#define NS_SYSCOLORCHANGED              (NS_WINDOW_START + 42)
+
 // Indicates a script error has occurred
 #define NS_SCRIPT_ERROR                 (NS_WINDOW_START + 50)
 

widget/src/windows/nsToolkit.cpp

@@ -370,6 +370,21 @@ LRESULT CALLBACK nsToolkit::WindowProc(HWND hWnd, UINT msg, WPARAM wParam,
             MethodInfo *info = (MethodInfo *)lParam;
             return info->Invoke();
         }
+
+        case WM_SYSCOLORCHANGE:
+        {
+          // WM_SYSCOLORCHANGE messages are only dispatched to top
+          // level windows but NS_SYSCOLORCHANGE messages must be dispatched
+          // to all windows including child windows. We dispatch these messages 
+          // from the nsToolkit because if we are running embedded we may not 
+          // have a top-level nsIWidget window.
+          
+          // On WIN32 all windows are automatically invalidated after the 
+          // WM_SYSCOLORCHANGE is dispatched so the window is drawn using
+          // the current system colors.
+          nsWindow::GlobalMsgWindowProc(hWnd, msg, wParam, lParam);
+        }
+
     }
 
 #ifdef MOZ_AIMM

widget/src/windows/nsWindow.cpp

@@ -644,6 +644,63 @@ private:
 
 static nsAttentionTimerMonitor *gAttentionTimerMonitor = 0;
 
+// Code to dispatch WM_SYSCOLORCHANGE message to all child windows.
+// WM_SYSCOLORCHANGE is only sent to top-level windows, but the 
+// cross platform API requires that NS_SYSCOLORCHANGE message be sent to
+// all child windows as well. When running in an embedded application
+// we may not receive a WM_SYSCOLORCHANGE message because the top 
+// level window is owned by the embeddor. Note: this code can be used to
+// dispatch other global messages (i.e messages that must be sent to all 
+// nsIWidget instances. 
+
+// Enumerate all child windows sending aMsg to each of them
+
+BOOL CALLBACK nsWindow::BroadcastMsgToChildren(HWND aWnd, LPARAM aMsg) 
+{
+  LONG proc = ::GetWindowLong(aWnd, GWL_WNDPROC);
+  if (proc == (LONG)&nsWindow::WindowProc) {
+    // its one of our windows so go ahead and send a message to it
+    WNDPROC winProc = (WNDPROC)GetWindowLong(aWnd, GWL_WNDPROC);
+    ::CallWindowProc(winProc, aWnd, aMsg, 0, 0);
+  }
+  // Send message to children of this window
+  ::EnumChildWindows(aWnd, nsWindow::BroadcastMsgToChildren, aMsg);
+  return TRUE;
+}
+
+// Enumerate all top level windows specifying that the children of each
+// top level window should be enumerated. Do *not* send the message to 
+// each top level window since it is assumed that the toolkit will send 
+// aMsg to them directly. 
+
+BOOL CALLBACK nsWindow::BroadcastMsg(HWND aTopWindow, LPARAM aMsg)
+{
+  // Iterate each of aTopWindows child windows sending the aMsg
+  // to each of them.
+  EnumChildWindows(aTopWindow, nsWindow::BroadcastMsgToChildren, aMsg);
+  return TRUE;
+}
+
+// This method is called from nsToolkit::WindowProc to forward global
+// messages which need to be dispatched to all child windows.
+
+void nsWindow::GlobalMsgWindowProc(HWND hWnd, UINT msg, 
+                                   WPARAM wParam, LPARAM lParam)
+
+{
+  switch (msg) {
+    case WM_SYSCOLORCHANGE:
+      // System color changes are posted to top-level windows only.
+      // The NS_SYSCOLORCHANGE must be dispatched to all child 
+      // windows as well.  
+     ::EnumThreadWindows(GetCurrentThreadId(), nsWindow::BroadcastMsg, msg);
+    break;
+  }
+}
+
+// End of the methods to dispatch global messages
+
+
 PRBool gIsDestroyingAny = PR_FALSE;
 
 //-------------------------------------------------------------------------
@@ -3424,6 +3481,15 @@ PRBool nsWindow::ProcessMessage(UINT msg, WPARAM wParam, LPARAM lParam, LRESULT
         case WM_DISPLAYCHANGE:
           DispatchStandardEvent(NS_DISPLAYCHANGED);
         break;
+
+        case WM_SYSCOLORCHANGE:
+          // Note: This is sent for child windows as well as top-level windows.
+          // The Win32 toolkit normally only sends these events to top-level windows.
+          // But we cycle through all of the childwindows and send it to them as well
+          // so all presentations get notified properly. 
+          // See nsWindow::GlobalMsgWindowProc.
+          DispatchStandardEvent(NS_SYSCOLORCHANGED);
+        break;
         
         case WM_NOTIFY:
             // TAB change

widget/src/windows/nsWindow.h

@@ -561,6 +561,11 @@ protected:
     IAccessible* mRootAccessible;
     static BOOL gIsAccessibilityOn;
 #endif
+
+   static BOOL CALLBACK BroadcastMsgToChildren(HWND aWnd, LPARAM aMsg);
+   static BOOL CALLBACK BroadcastMsg(HWND aTopWindow, LPARAM aMsg);
+public:
+   static void GlobalMsgWindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
 };
 
 //