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-rw-r--r--widget/WindowOcclusionState.h34
1 files changed, 34 insertions, 0 deletions
diff --git a/widget/WindowOcclusionState.h b/widget/WindowOcclusionState.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef widget_WindowOcclusionState_h
+#define widget_WindowOcclusionState_h
+
+namespace mozilla {
+namespace widget {
+
+// nsWindow's window occlusion state. On Windows, it is tracked by
+// WinWindowOcclusionTracker.
+enum class OcclusionState {
+ // The window's occlusion state isn't tracked (NotifyOcclusionState()) or
+ // hasn't been computed yet.
+ UNKNOWN = 0,
+ // The window IsWindowVisibleAndFullyOpaque() [1] and:
+ // - Its bounds aren't completely covered by fully opaque windows [2]
+ VISIBLE = 1,
+ // The window IsWindowVisibleAndFullyOpaque() [1], but they all:
+ // - Have bounds completely covered by fully opaque windows [2]
+ OCCLUDED = 2,
+ // The window is not IsWindowVisibleAndFullyOpaque() [1].
+ HIDDEN = 3,
+
+ kMaxValue = HIDDEN,
+};
+
+} // namespace widget
+} // namespace mozilla
+
+#endif // widget_WindowOcclusionState_h