widget/windows/nsAppShell.h

   1 /* -*- Mode: c++; tab-width: 2; indent-tabs-mode: nil; -*- */
   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 nsAppShell_h__
   7 #define nsAppShell_h__
   8
   9 #include "nsBaseAppShell.h"
  10 #include <windows.h>
  11 #include <vector>
  12 #include "mozilla/TimeStamp.h"
  13 #include "mozilla/Mutex.h"
  14
  15 // The maximum time we allow before forcing a native event callback.
  16 // In seconds.
  17 #define NATIVE_EVENT_STARVATION_LIMIT 1
  18
  19 /**
  20  * Native Win32 Application shell wrapper
  21  */
  22 class nsAppShell final : public nsBaseAppShell {
  23  public:
  24   nsAppShell()
  25       : mEventWnd(nullptr),
  26         mNativeCallbackPending(false),
  27         mLastNativeEventScheduledMutex(
  28             "nsAppShell::mLastNativeEventScheduledMutex") {}
  29   typedef mozilla::TimeStamp TimeStamp;
  30   typedef mozilla::Mutex Mutex;
  31
  32   static bool PrecacheEventWindow();
  33
  34   nsresult Init();
  35   void DoProcessMoreGeckoEvents();
  36
  37   static UINT GetTaskbarButtonCreatedMessage();
  38
  39   NS_IMETHOD AfterProcessNextEvent(nsIThreadInternal* thread,
  40                                    bool eventWasProcessed) final;
  41
  42  protected:
  43   NS_IMETHOD Run() override;
  44   NS_IMETHOD Observe(nsISupports* aSubject, const char* aTopic,
  45                      const char16_t* aData) override;
  46
  47   virtual void ScheduleNativeEventCallback();
  48   virtual bool ProcessNextNativeEvent(bool mayWait);
  49   virtual ~nsAppShell();
  50
  51   static LRESULT CALLBACK EventWindowProc(HWND, UINT, WPARAM, LPARAM);
  52
  53  protected:
  54   static HWND StaticCreateEventWindow();
  55   static HWND sPrecachedEventWnd;
  56   nsresult InitEventWindow();
  57   HWND mEventWnd;
  58   bool mNativeCallbackPending;
  59
  60   Mutex mLastNativeEventScheduledMutex MOZ_UNANNOTATED;
  61   TimeStamp mLastNativeEventScheduled;
  62   std::vector<MSG> mMsgsToRepost;
  63
  64  private:
  65   wchar_t mTimezoneName[128];
  66 };
  67
  68 #endif  // nsAppShell_h__