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      1 /*
      2  * libjingle
      3  * Copyright 2004--2005, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "talk/base/common.h"
     29 #include "talk/base/logging.h"
     30 #include "talk/base/win32window.h"
     31 
     32 namespace talk_base {
     33 
     34 ///////////////////////////////////////////////////////////////////////////////
     35 // Win32Window
     36 ///////////////////////////////////////////////////////////////////////////////
     37 
     38 static const wchar_t kWindowBaseClassName[] = L"WindowBaseClass";
     39 HINSTANCE Win32Window::instance_ = NULL;
     40 ATOM Win32Window::window_class_ = 0;
     41 
     42 Win32Window::Win32Window() : wnd_(NULL) {
     43 }
     44 
     45 Win32Window::~Win32Window() {
     46   ASSERT(NULL == wnd_);
     47 }
     48 
     49 bool Win32Window::Create(HWND parent, const wchar_t* title, DWORD style,
     50                          DWORD exstyle, int x, int y, int cx, int cy) {
     51   if (wnd_) {
     52     // Window already exists.
     53     return false;
     54   }
     55 
     56   if (!window_class_) {
     57     if (!GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
     58                            GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
     59                            reinterpret_cast<LPCWSTR>(&Win32Window::WndProc),
     60                            &instance_)) {
     61       LOG_GLE(LS_ERROR) << "GetModuleHandleEx failed";
     62       return false;
     63     }
     64 
     65     // Class not registered, register it.
     66     WNDCLASSEX wcex;
     67     memset(&wcex, 0, sizeof(wcex));
     68     wcex.cbSize = sizeof(wcex);
     69     wcex.hInstance = instance_;
     70     wcex.lpfnWndProc = &Win32Window::WndProc;
     71     wcex.lpszClassName = kWindowBaseClassName;
     72     window_class_ = ::RegisterClassEx(&wcex);
     73     if (!window_class_) {
     74       LOG_GLE(LS_ERROR) << "RegisterClassEx failed";
     75       return false;
     76     }
     77   }
     78   wnd_ = ::CreateWindowEx(exstyle, kWindowBaseClassName, title, style,
     79                           x, y, cx, cy, parent, NULL, instance_, this);
     80   return (NULL != wnd_);
     81 }
     82 
     83 void Win32Window::Destroy() {
     84   VERIFY(::DestroyWindow(wnd_) != FALSE);
     85 }
     86 
     87 void Win32Window::Shutdown() {
     88   if (window_class_) {
     89     ::UnregisterClass(MAKEINTATOM(window_class_), instance_);
     90     window_class_ = 0;
     91   }
     92 }
     93 
     94 bool Win32Window::OnMessage(UINT uMsg, WPARAM wParam, LPARAM lParam,
     95                             LRESULT& result) {
     96   switch (uMsg) {
     97   case WM_CLOSE:
     98     if (!OnClose()) {
     99       result = 0;
    100       return true;
    101     }
    102     break;
    103   }
    104   return false;
    105 }
    106 
    107 LRESULT Win32Window::WndProc(HWND hwnd, UINT uMsg,
    108                              WPARAM wParam, LPARAM lParam) {
    109   Win32Window* that = reinterpret_cast<Win32Window*>(
    110       ::GetWindowLongPtr(hwnd, GWLP_USERDATA));
    111   if (!that && (WM_CREATE == uMsg)) {
    112     CREATESTRUCT* cs = reinterpret_cast<CREATESTRUCT*>(lParam);
    113     that = static_cast<Win32Window*>(cs->lpCreateParams);
    114     that->wnd_ = hwnd;
    115     ::SetWindowLongPtr(hwnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(that));
    116   }
    117   if (that) {
    118     LRESULT result;
    119     bool handled = that->OnMessage(uMsg, wParam, lParam, result);
    120     if (WM_DESTROY == uMsg) {
    121       for (HWND child = ::GetWindow(hwnd, GW_CHILD); child;
    122            child = ::GetWindow(child, GW_HWNDNEXT)) {
    123         LOG(LS_INFO) << "Child window: " << static_cast<void*>(child);
    124       }
    125     }
    126     if (WM_NCDESTROY == uMsg) {
    127       ::SetWindowLongPtr(hwnd, GWLP_USERDATA, NULL);
    128       that->wnd_ = NULL;
    129       that->OnNcDestroy();
    130     }
    131     if (handled) {
    132       return result;
    133     }
    134   }
    135   return ::DefWindowProc(hwnd, uMsg, wParam, lParam);
    136 }
    137 
    138 }  // namespace talk_base
    139