widget/src/windows/nsAppShell.cpp

   1 /* -*- Mode: c++; tab-width: 2; indent-tabs-mode: nil; -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is mozilla.org code.
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Netscape Communications Corporation.
  19  * Portions created by the Initial Developer are Copyright (C) 1998
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *   Michael Lowe <michael.lowe@bigfoot.com>
  24  *   Darin Fisher <darin@meer.net>
  25  *
  26  * Alternatively, the contents of this file may be used under the terms of
  27  * either the GNU General Public License Version 2 or later (the "GPL"), or
  28  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  29  * in which case the provisions of the GPL or the LGPL are applicable instead
  30  * of those above. If you wish to allow use of your version of this file only
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  35  * the provisions above, a recipient may use your version of this file under
  36  * the terms of any one of the MPL, the GPL or the LGPL.
  37  *
  38  * ***** END LICENSE BLOCK ***** */
  39
  40 #include "nsAppShell.h"
  41 #include "nsToolkit.h"
  42 #include "nsThreadUtils.h"
  43
  44 static UINT sMsgId;
  45
  46 //-------------------------------------------------------------------------
  47
  48 static BOOL PeekKeyAndIMEMessage(LPMSG msg, HWND hwnd)
  49 {
  50   MSG msg1, msg2, *lpMsg;
  51   BOOL b1, b2;
  52   b1 = ::PeekMessageW(&msg1, NULL, WM_KEYFIRST, WM_IME_KEYLAST, PM_NOREMOVE);
  53   b2 = ::PeekMessageW(&msg2, NULL, WM_IME_SETCONTEXT, WM_IME_KEYUP, PM_NOREMOVE);
  54   if (b1 || b2) {
  55     if (b1 && b2) {
  56       if (msg1.time < msg2.time)
  57         lpMsg = &msg1;
  58       else
  59         lpMsg = &msg2;
  60     } else if (b1)
  61       lpMsg = &msg1;
  62     else
  63       lpMsg = &msg2;
  64     return ::PeekMessageW(msg, hwnd, lpMsg->message, lpMsg->message, PM_REMOVE);
  65   }
  66
  67   return false;
  68 }
  69
  70 /*static*/ LRESULT CALLBACK
  71 nsAppShell::EventWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
  72 {
  73   if (uMsg == sMsgId) {
  74     nsAppShell *as = reinterpret_cast<nsAppShell *>(lParam);
  75     as->NativeEventCallback();
  76     NS_RELEASE(as);
  77     return TRUE;
  78   }
  79   return DefWindowProc(hwnd, uMsg, wParam, lParam);
  80 }
  81
  82 nsAppShell::~nsAppShell()
  83 {
  84   if (mEventWnd) {
  85     // DestroyWindow doesn't do anything when called from a non UI thread.
  86     // Since mEventWnd was created on the UI thread, it must be destroyed on
  87     // the UI thread.
  88     SendMessage(mEventWnd, WM_CLOSE, 0, 0);
  89   }
  90 }
  91
  92 nsresult
  93 nsAppShell::Init()
  94 {
  95   if (!sMsgId)
  96     sMsgId = RegisterWindowMessageW(L"nsAppShell:EventID");
  97
  98   WNDCLASSW wc;
  99   HINSTANCE module = GetModuleHandle(NULL);
 100
 101   const PRUnichar *const kWindowClass = L"nsAppShell:EventWindowClass";
 102   if (!GetClassInfoW(module, kWindowClass, &wc)) {
 103     wc.style         = 0;
 104     wc.lpfnWndProc   = EventWindowProc;
 105     wc.cbClsExtra    = 0;
 106     wc.cbWndExtra    = 0;
 107     wc.hInstance     = module;
 108     wc.hIcon         = NULL;
 109     wc.hCursor       = NULL;
 110     wc.hbrBackground = (HBRUSH) NULL;
 111     wc.lpszMenuName  = (LPCWSTR) NULL;
 112     wc.lpszClassName = kWindowClass;
 113     RegisterClassW(&wc);
 114   }
 115
 116   mEventWnd = CreateWindowW(kWindowClass, L"nsAppShell:EventWindow",
 117                            0, 0, 0, 10, 10, NULL, NULL, module, NULL);
 118   NS_ENSURE_STATE(mEventWnd);
 119
 120   return nsBaseAppShell::Init();
 121 }
 122
 123 void
 124 nsAppShell::ScheduleNativeEventCallback()
 125 {
 126   // post a message to the native event queue...
 127   NS_ADDREF_THIS();
 128   ::PostMessage(mEventWnd, sMsgId, 0, reinterpret_cast<LPARAM>(this));
 129 }
 130
 131 PRBool
 132 nsAppShell::ProcessNextNativeEvent(PRBool mayWait)
 133 {
 134   PRBool gotMessage = PR_FALSE;
 135
 136   do {
 137     MSG msg;
 138     // Give priority to system messages (in particular keyboard, mouse, timer,
 139     // and paint messages).
 140     if (PeekKeyAndIMEMessage(&msg, NULL) ||
 141         ::PeekMessageW(&msg, NULL, WM_MOUSEFIRST, WM_MOUSELAST, PM_REMOVE) ||
 142         ::PeekMessageW(&msg, NULL, 0, 0, PM_REMOVE)) {
 143       gotMessage = PR_TRUE;
 144       if (msg.message == WM_QUIT) {
 145         ::PostQuitMessage(msg.wParam);
 146         Exit();
 147       } else {
 148         ::TranslateMessage(&msg);
 149         ::DispatchMessageW(&msg);
 150       }
 151     } else if (mayWait) {
 152       // Block and wait for any posted application message
 153       ::WaitMessage();
 154     }
 155   } while (!gotMessage && mayWait);
 156
 157   return gotMessage;
 158 }