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-rw-r--r--widget/windows/nsWindowTaskbarConcealer.h51
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diff --git a/widget/windows/nsWindowTaskbarConcealer.h b/widget/windows/nsWindowTaskbarConcealer.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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_WINDOWS_NSWINDOWTASKBARCONCEALER_H_
+#define WIDGET_WINDOWS_NSWINDOWTASKBARCONCEALER_H_
+
+#include "nsWindow.h"
+#include "mozilla/Maybe.h"
+
+/**
+ * nsWindow::TaskbarConcealer
+ *
+ * Fullscreen-state (and, thus, taskbar-occlusion) manager.
+ */
+class nsWindow::TaskbarConcealer {
+ public:
+ // To be called when a window acquires focus. (Note that no action need be
+ // taken when focus is lost.)
+ static void OnFocusAcquired(nsWindow* aWin);
+
+ // To be called during or after a window's destruction. The corresponding
+ // nsWindow pointer is not needed, and will not be acquired or accessed.
+ static void OnWindowDestroyed(HWND aWnd);
+
+ // To be called when the Gecko-fullscreen state of a window changes.
+ static void OnFullscreenChanged(nsWindow* aWin, bool enteredFullscreen);
+
+ // To be called when the position of a window changes. (Performs its own
+ // batching; irrelevant movements will be cheap.)
+ static void OnWindowPosChanged(nsWindow* aWin);
+
+ // To be called when the cloaking state of any window changes. (Expects that
+ // all windows' internal cloaking-state mirror variables are up-to-date.)
+ static void OnCloakChanged();
+
+ private:
+ static void UpdateAllState(HWND destroyedHwnd = nullptr);
+
+ struct WindowState {
+ HMONITOR monitor;
+ bool isGkFullscreen;
+ };
+ static mozilla::Maybe<WindowState> GetWindowState(HWND);
+
+ static nsTHashMap<HWND, HMONITOR> sKnownWindows;
+ struct Impl;
+};
+
+#endif // WIDGET_WINDOWS_NSWINDOWTASKBARCONCEALER_H_