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-rw-r--r--widget/windows/WinEventObserver.h115
1 files changed, 115 insertions, 0 deletions
diff --git a/widget/windows/WinEventObserver.h b/widget/windows/WinEventObserver.h
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+++ b/widget/windows/WinEventObserver.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_windows_WinEventObserver_h
+#define widget_windows_WinEventObserver_h
+
+#include <windows.h>
+
+#include "mozilla/Maybe.h"
+#include "nsISupportsImpl.h"
+#include "nsTHashSet.h"
+
+namespace mozilla {
+
+namespace widget {
+
+class WinEventObserver {
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(WinEventObserver)
+ public:
+ virtual void OnWinEventProc(HWND aHwnd, UINT aMsg, WPARAM aWParam,
+ LPARAM aLParam) {}
+ virtual void Destroy();
+
+ protected:
+ virtual ~WinEventObserver();
+
+ bool mDestroyed = false;
+};
+
+// Uses singleton window to observe events like display status and session
+// change.
+class WinEventHub final {
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(WinEventHub)
+
+ public:
+ // Returns true if the singleton exists (or was created). Will return
+ // false if the singleton couldn't be created, in which case a call
+ // to Get() will return a nullptr. It is safe to call this function
+ // repeatedly.
+ static bool Ensure();
+ static RefPtr<WinEventHub> Get() { return sInstance; }
+
+ void AddObserver(WinEventObserver* aObserver);
+ void RemoveObserver(WinEventObserver* aObserver);
+
+ HWND GetWnd() { return mHWnd; }
+
+ private:
+ WinEventHub();
+ ~WinEventHub();
+
+ static LRESULT CALLBACK WinEventProc(HWND aHwnd, UINT aMsg, WPARAM aWParam,
+ LPARAM aLParam);
+
+ bool Initialize();
+ void ProcessWinEventProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);
+
+ HWND mHWnd = nullptr;
+ nsTHashSet<nsRefPtrHashKey<WinEventObserver>> mObservers;
+
+ static StaticRefPtr<WinEventHub> sInstance;
+};
+
+class DisplayStatusListener {
+ public:
+ virtual void OnDisplayStateChanged(bool aDisplayOn) = 0;
+};
+
+// Observe Display on/off event
+class DisplayStatusObserver final : public WinEventObserver {
+ public:
+ static already_AddRefed<DisplayStatusObserver> Create(
+ DisplayStatusListener* aListener);
+
+ private:
+ explicit DisplayStatusObserver(DisplayStatusListener* aListener);
+ virtual ~DisplayStatusObserver();
+ void OnWinEventProc(HWND aHwnd, UINT aMsg, WPARAM aWParam,
+ LPARAM aLParam) override;
+
+ DisplayStatusListener* mListener;
+
+ HPOWERNOTIFY mDisplayStatusHandle = nullptr;
+};
+
+class SessionChangeListener {
+ public:
+ virtual void OnSessionChange(WPARAM aStatusCode,
+ Maybe<bool> aIsCurrentSession) = 0;
+};
+
+// Observe session lock/unlock event
+class SessionChangeObserver : public WinEventObserver {
+ public:
+ static already_AddRefed<SessionChangeObserver> Create(
+ SessionChangeListener* aListener);
+
+ private:
+ explicit SessionChangeObserver(SessionChangeListener* aListener);
+ virtual ~SessionChangeObserver();
+
+ void Initialize();
+ void OnWinEventProc(HWND aHwnd, UINT aMsg, WPARAM aWParam,
+ LPARAM aLParam) override;
+
+ SessionChangeListener* mListener;
+};
+
+} // namespace widget
+} // namespace mozilla
+
+#endif // widget_windows_WinEventObserver_h