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/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "rtc_base/win32_window.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
namespace rtc {
///////////////////////////////////////////////////////////////////////////////
// Win32Window
///////////////////////////////////////////////////////////////////////////////
static const wchar_t kWindowBaseClassName[] = L"RtcWindowBaseClass";
HINSTANCE Win32Window::instance_ = nullptr;
ATOM Win32Window::window_class_ = 0;
Win32Window::Win32Window() : wnd_(nullptr) {}
Win32Window::~Win32Window() { RTC_DCHECK(nullptr == wnd_); }
bool Win32Window::Create(HWND parent, const wchar_t* title, DWORD style,
DWORD exstyle, int x, int y, int cx, int cy) {
if (wnd_) {
// Window already exists.
return false;
}
if (!window_class_) {
if (!GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
reinterpret_cast<LPCWSTR>(&Win32Window::WndProc),
&instance_)) {
RTC_LOG_GLE(LS_ERROR) << "GetModuleHandleEx failed";
return false;
}
// Register or reregister the class as necessary. window_class_ == nullptr
// is not an infallible indicator that the class is unregistered.
WNDCLASSEXW wcex;
memset(&wcex, 0, sizeof(wcex));
wcex.cbSize = sizeof(wcex);
if (::GetClassInfoExW(instance_, kWindowBaseClassName, &wcex) &&
!::UnregisterClassW(kWindowBaseClassName, instance_)) {
RTC_LOG_GLE(LS_ERROR) << "UnregisterClass failed.";
}
memset(&wcex, 0, sizeof(wcex));
wcex.cbSize = sizeof(wcex);
wcex.hInstance = instance_;
wcex.lpfnWndProc = &Win32Window::WndProc;
wcex.lpszClassName = kWindowBaseClassName;
window_class_ = ::RegisterClassExW(&wcex);
if (!window_class_) {
RTC_LOG_GLE(LS_ERROR) << "RegisterClassEx failed";
return false;
}
}
wnd_ = ::CreateWindowExW(exstyle, kWindowBaseClassName, title, style, x, y,
cx, cy, parent, nullptr, instance_, this);
return (nullptr != wnd_);
}
void Win32Window::Destroy() {
const bool success = ::DestroyWindow(wnd_);
RTC_DCHECK(success);
}
void Win32Window::Shutdown() {
if (window_class_) {
if (!::UnregisterClass(MAKEINTATOM(window_class_), instance_)) {
RTC_LOG_GLE(LS_ERROR) << "UnregisterClass failed.";
}
window_class_ = 0;
}
}
bool Win32Window::OnMessage(UINT uMsg, WPARAM wParam, LPARAM lParam,
LRESULT& result) {
switch (uMsg) {
case WM_CLOSE:
if (!OnClose()) {
result = 0;
return true;
}
break;
}
return false;
}
bool Win32Window::OnClose() { return true; }
void Win32Window::OnNcDestroy() {
// Do nothing. }
}
LRESULT Win32Window::WndProc(HWND hwnd, UINT uMsg, WPARAM wParam,
LPARAM lParam) {
Win32Window* that =
reinterpret_cast<Win32Window*>(::GetWindowLongPtr(hwnd, GWLP_USERDATA));
if (!that && (WM_CREATE == uMsg)) {
CREATESTRUCT* cs = reinterpret_cast<CREATESTRUCT*>(lParam);
that = static_cast<Win32Window*>(cs->lpCreateParams);
that->wnd_ = hwnd;
::SetWindowLongPtr(hwnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(that));
}
if (that) {
LRESULT result;
bool handled = that->OnMessage(uMsg, wParam, lParam, result);
if (WM_DESTROY == uMsg) {
for (HWND child = ::GetWindow(hwnd, GW_CHILD); child;
child = ::GetWindow(child, GW_HWNDNEXT)) {
RTC_LOG(LS_INFO) << "Child window: " << static_cast<void*>(child);
}
}
if (WM_NCDESTROY == uMsg) {
::SetWindowLongPtr(hwnd, GWLP_USERDATA, NULL);
that->wnd_ = nullptr;
that->OnNcDestroy();
}
if (handled) {
return result;
}
}
return ::DefWindowProc(hwnd, uMsg, wParam, lParam);
}
} // namespace rtc
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