widget/windows/nsWindowTaskbarConcealer.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef WIDGET_WINDOWS_NSWINDOWTASKBARCONCEALER_H_
   7 #define WIDGET_WINDOWS_NSWINDOWTASKBARCONCEALER_H_
   8
   9 #include "nsWindow.h"
  10 #include "mozilla/Maybe.h"
  11
  12 /**
  13  * nsWindow::TaskbarConcealer
  14  *
  15  * Fullscreen-state (and, thus, taskbar-occlusion) manager.
  16  */
  17 class nsWindow::TaskbarConcealer {
  18  public:
  19   // To be called when a window acquires focus. (Note that no action need be
  20   // taken when focus is lost.)
  21   static void OnFocusAcquired(nsWindow* aWin);
  22
  23   // To be called during or after a window's destruction. The corresponding
  24   // nsWindow pointer is not needed, and will not be acquired or accessed.
  25   static void OnWindowDestroyed(HWND aWnd);
  26
  27   // To be called when the Gecko-fullscreen state of a window changes.
  28   static void OnFullscreenChanged(nsWindow* aWin, bool enteredFullscreen);
  29
  30   // To be called when the position of a window changes. (Performs its own
  31   // batching; irrelevant movements will be cheap.)
  32   static void OnWindowPosChanged(nsWindow* aWin);
  33
  34   // To be called when the cloaking state of any window changes. (Expects that
  35   // all windows' internal cloaking-state mirror variables are up-to-date.)
  36   static void OnCloakChanged();
  37
  38   // To be called upon receipt of MOZ_WM_FULLSCREEN_STATE_UPDATE.
  39   static void OnAsyncStateUpdateRequest(HWND);
  40
  41  private:
  42   static void UpdateAllState(HWND destroyedHwnd = nullptr);
  43
  44   struct WindowState {
  45     HMONITOR monitor;
  46     bool isGkFullscreen;
  47   };
  48   static mozilla::Maybe<WindowState> GetWindowState(HWND);
  49
  50   static nsTHashMap<HWND, HMONITOR> sKnownWindows;
  51 };
  52
  53 #endif  // WIDGET_WINDOWS_NSWINDOWTASKBARCONCEALER_H_