Bug 595277 - Part 1: Add a method to iterate over all windows. r=roc

widget/src/windows/nsWindow.cpp

@@ -1098,6 +1098,35 @@ nsWindow* nsWindow::GetParentWindow(PRBool aIncludeOwner)
   return widget;
 }
  
+BOOL CALLBACK
+nsWindow::EnumAllChildWindProc(HWND aWnd, LPARAM aParam)
+{
+  nsWindow *wnd = nsWindow::GetNSWindowPtr(aWnd);
+  if (wnd) {
+    ((nsWindow::WindowEnumCallback*)aParam)(wnd);
+  }
+  return TRUE;
+}
+
+BOOL CALLBACK
+nsWindow::EnumAllThreadWindowProc(HWND aWnd, LPARAM aParam)
+{
+  nsWindow *wnd = nsWindow::GetNSWindowPtr(aWnd);
+  if (wnd) {
+    ((nsWindow::WindowEnumCallback*)aParam)(wnd);
+  }
+  EnumChildWindows(aWnd, EnumAllChildWindProc, aParam);
+  return TRUE;
+}
+
+void
+nsWindow::EnumAllWindows(WindowEnumCallback aCallback)
+{
+  EnumThreadWindows(GetCurrentThreadId(),
+                    EnumAllThreadWindowProc,
+                    (LPARAM)&aCallback);
+}
+
 /**************************************************************
  *
  * SECTION: nsIWidget::Show

widget/src/windows/nsWindow.h

@@ -247,6 +247,9 @@ public:
   static nsWindow*        GetNSWindowPtr(HWND aWnd);
   WindowHook&             GetWindowHook() { return mWindowHook; }
   nsWindow*               GetParentWindow(PRBool aIncludeOwner);
+  // Get an array of all nsWindow*s on the main thread.
+  typedef void            (WindowEnumCallback)(nsWindow*);
+  static void             EnumAllWindows(WindowEnumCallback aCallback);
 
   /**
    * Misc.
@@ -292,6 +295,8 @@ protected:
   static LRESULT CALLBACK MozSpecialMouseProc(int code, WPARAM wParam, LPARAM lParam);
   static VOID    CALLBACK HookTimerForPopups( HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime );
   static BOOL    CALLBACK ClearResourcesCallback(HWND aChild, LPARAM aParam);
+  static BOOL    CALLBACK EnumAllChildWindProc(HWND aWnd, LPARAM aParam);
+  static BOOL    CALLBACK EnumAllThreadWindowProc(HWND aWnd, LPARAM aParam);
 
   /**
    * Window utilities