widget/WindowOcclusionState.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef widget_WindowOcclusionState_h
   8 #define widget_WindowOcclusionState_h
   9
  10 namespace mozilla {
  11 namespace widget {
  12
  13 // nsWindow's window occlusion state. On Windows, it is tracked by
  14 // WinWindowOcclusionTracker.
  15 enum class OcclusionState {
  16   // The window's occlusion state isn't tracked (NotifyOcclusionState()) or
  17   // hasn't been computed yet.
  18   UNKNOWN = 0,
  19   // The window IsWindowVisibleAndFullyOpaque() [1] and:
  20   // - Its bounds aren't completely covered by fully opaque windows [2]
  21   VISIBLE = 1,
  22   // The window IsWindowVisibleAndFullyOpaque() [1], but they all:
  23   // - Have bounds completely covered by fully opaque windows [2]
  24   OCCLUDED = 2,
  25   // The window is not IsWindowVisibleAndFullyOpaque() [1].
  26   HIDDEN = 3,
  27
  28   kMaxValue = HIDDEN,
  29 };
  30
  31 }  // namespace widget
  32 }  // namespace mozilla
  33
  34 #endif  // widget_WindowOcclusionState_h