peerconnection/samples/client/main_wnd.cc - platform/external/webrtc - Gitiles

 /*
  *  Copyright (c) 2011 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 "peerconnection/samples/client/main_wnd.h"

 #include "talk/base/common.h"
 #include "talk/base/logging.h"

 ATOM MainWnd::wnd_class_ = 0;
 const wchar_t MainWnd::kClassName[] = L"WebRTC_MainWnd";

 // TODO(tommi): declare in header:
 std::string GetDefaultServerName();

 namespace {
 void CalculateWindowSizeForText(HWND wnd, const wchar_t* text,
                                 size_t* width, size_t* height) {
   HDC dc = ::GetDC(wnd);
   RECT text_rc = {0};
   ::DrawText(dc, text, -1, &text_rc, DT_CALCRECT | DT_SINGLELINE);
   ::ReleaseDC(wnd, dc);
   RECT client, window;
   ::GetClientRect(wnd, &client);
   ::GetWindowRect(wnd, &window);

   *width = text_rc.right - text_rc.left;
   *width += (window.right - window.left) -
             (client.right - client.left);
   *height = text_rc.bottom - text_rc.top;
   *height += (window.bottom - window.top) -
              (client.bottom - client.top);
 }

 HFONT GetDefaultFont() {
   static HFONT font = reinterpret_cast<HFONT>(GetStockObject(DEFAULT_GUI_FONT));
   return font;
 }

 std::string GetWindowText(HWND wnd) {
   char text[MAX_PATH] = {0};
   ::GetWindowTextA(wnd, &text[0], ARRAYSIZE(text));
   return text;
 }

 void AddListBoxItem(HWND listbox, const std::string& str, LPARAM item_data) {
   LRESULT index = ::SendMessageA(listbox, LB_ADDSTRING, 0,
       reinterpret_cast<LPARAM>(str.c_str()));
   ::SendMessageA(listbox, LB_SETITEMDATA, index, item_data);
 }

 }  // namespace

 MainWnd::MainWnd()
   : ui_(CONNECT_TO_SERVER), wnd_(NULL), edit1_(NULL), edit2_(NULL),
     label1_(NULL), label2_(NULL), button_(NULL), listbox_(NULL),
     destroyed_(false), callback_(NULL), nested_msg_(NULL) {
 }

 MainWnd::~MainWnd() {
   ASSERT(!IsWindow());
 }

 bool MainWnd::Create() {
   ASSERT(wnd_ == NULL);
   if (!RegisterWindowClass())
     return false;

   wnd_ = ::CreateWindowExW(WS_EX_OVERLAPPEDWINDOW, kClassName, L"WebRTC",
       WS_OVERLAPPEDWINDOW | WS_VISIBLE | WS_CLIPCHILDREN,
       CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
       NULL, NULL, GetModuleHandle(NULL), this);

   ::SendMessage(wnd_, WM_SETFONT, reinterpret_cast<WPARAM>(GetDefaultFont()),
                 TRUE);

   CreateChildWindows();
   SwitchToConnectUI();

   return wnd_ != NULL;
 }

 bool MainWnd::Destroy() {
   BOOL ret = FALSE;
   if (IsWindow()) {
     ret = ::DestroyWindow(wnd_);
   }

   return ret != FALSE;
 }

 void MainWnd::RegisterObserver(MainWndCallback* callback) {
   callback_ = callback;
 }

 bool MainWnd::IsWindow() const {
   return wnd_ && ::IsWindow(wnd_) != FALSE;
 }

 bool MainWnd::PreTranslateMessage(MSG* msg) {
   bool ret = false;
   if (msg->message == WM_CHAR) {
     if (msg->wParam == VK_TAB) {
       HandleTabbing();
       ret = true;
     } else if (msg->wParam == VK_RETURN) {
       OnDefaultAction();
       ret = true;
     } else if (msg->wParam == VK_ESCAPE) {
       if (callback_) {
         if (ui_ == STREAMING) {
           callback_->DisconnectFromCurrentPeer();
         } else {
           callback_->DisconnectFromServer();
         }
       }
     }
   }
   return ret;
 }

 void MainWnd::SwitchToConnectUI() {
   ASSERT(IsWindow());
   LayoutPeerListUI(false);
   ui_ = CONNECT_TO_SERVER;
   LayoutConnectUI(true);
   ::SetFocus(edit1_);
 }

 void MainWnd::SwitchToPeerList(const Peers& peers) {
   LayoutConnectUI(false);

   ::SendMessage(listbox_, LB_RESETCONTENT, 0, 0);

   AddListBoxItem(listbox_, "List of currently connected peers:", -1);
   Peers::const_iterator i = peers.begin();
   for (; i != peers.end(); ++i)
     AddListBoxItem(listbox_, i->second.c_str(), i->first);

   ui_ = LIST_PEERS;
   LayoutPeerListUI(true);
 }

 void MainWnd::SwitchToStreamingUI() {
   LayoutConnectUI(false);
   LayoutPeerListUI(false);
   ui_ = STREAMING;
 }

 void MainWnd::OnPaint() {
   PAINTSTRUCT ps;
   ::BeginPaint(handle(), &ps);

   RECT rc;
   ::GetClientRect(handle(), &rc);
   HBRUSH brush = ::CreateSolidBrush(::GetSysColor(COLOR_WINDOW));
   ::FillRect(ps.hdc, &rc, brush);
   ::DeleteObject(brush);

   ::EndPaint(handle(), &ps);
 }

 void MainWnd::OnDestroyed() {
   PostQuitMessage(0);
 }

 void MainWnd::OnDefaultAction() {
   if (!callback_)
     return;
   if (ui_ == CONNECT_TO_SERVER) {
     std::string server(GetWindowText(edit1_));
     std::string port_str(GetWindowText(edit2_));
     int port = port_str.length() ? atoi(port_str.c_str()) : 0;
     callback_->StartLogin(server, port);
   } else if (ui_ == LIST_PEERS) {
     LRESULT sel = ::SendMessage(listbox_, LB_GETCURSEL, 0, 0);
     if (sel != LB_ERR) {
       LRESULT peer_id = ::SendMessage(listbox_, LB_GETITEMDATA, sel, 0);
       if (peer_id != -1 && callback_) {
         callback_->ConnectToPeer(peer_id);
       }
     }
   } else {
     MessageBoxA(wnd_, "OK!", "Yeah", MB_OK);
   }
 }

 bool MainWnd::OnMessage(UINT msg, WPARAM wp, LPARAM lp, LRESULT* result) {
   switch (msg) {
     case WM_ERASEBKGND:
       *result = TRUE;
       return true;
     case WM_PAINT:
       OnPaint();
       return true;
     case WM_SETFOCUS:
       if (ui_ == CONNECT_TO_SERVER) {
         SetFocus(edit1_);
       }
       return true;
     case WM_SIZE:
       if (ui_ == CONNECT_TO_SERVER) {
         LayoutConnectUI(true);
       } else if (ui_ == LIST_PEERS) {
         LayoutPeerListUI(true);
       }
       break;
     case WM_CTLCOLORSTATIC:
       *result = reinterpret_cast<LRESULT>(GetSysColorBrush(COLOR_WINDOW));
       return true;
     case WM_COMMAND:
       if (button_ == reinterpret_cast<HWND>(lp)) {
         if (BN_CLICKED == HIWORD(wp))
           OnDefaultAction();
       } else if (listbox_ == reinterpret_cast<HWND>(lp)) {
         if (LBN_DBLCLK == HIWORD(wp)) {
           OnDefaultAction();
         }
       }
       return true;
   }
   return false;
 }

 // static
 LRESULT CALLBACK MainWnd::WndProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp) {
   MainWnd* me = reinterpret_cast<MainWnd*>(
       ::GetWindowLongPtr(hwnd, GWL_USERDATA));
   if (!me && WM_CREATE == msg) {
     CREATESTRUCT* cs = reinterpret_cast<CREATESTRUCT*>(lp);
     me = reinterpret_cast<MainWnd*>(cs->lpCreateParams);
     me->wnd_ = hwnd;
     ::SetWindowLongPtr(hwnd, GWL_USERDATA, reinterpret_cast<LONG_PTR>(me));
   }

   LRESULT result = 0;
   if (me) {
     void* prev_nested_msg = me->nested_msg_;
     me->nested_msg_ = &msg;

     bool handled = me->OnMessage(msg, wp, lp, &result);
     if (WM_NCDESTROY == msg) {
       me->destroyed_ = true;
     } else if (!handled) {
       result = ::DefWindowProc(hwnd, msg, wp, lp);
     }

     if (me->destroyed_ && prev_nested_msg == NULL) {
       me->OnDestroyed();
       me->wnd_ = NULL;
       me->destroyed_ = false;
     }

     me->nested_msg_ = prev_nested_msg;
   } else {
     result = ::DefWindowProc(hwnd, msg, wp, lp);
   }

   return result;
 }

 // static
 bool MainWnd::RegisterWindowClass() {
   if (wnd_class_)
     return true;

   WNDCLASSEX wcex = { sizeof(WNDCLASSEX) };
   wcex.style = CS_DBLCLKS;
   wcex.hInstance = GetModuleHandle(NULL);
   wcex.hbrBackground = reinterpret_cast<HBRUSH>(COLOR_WINDOW + 1);
   wcex.hCursor = ::LoadCursor(NULL, IDC_ARROW);
   wcex.lpfnWndProc = &WndProc;
   wcex.lpszClassName = kClassName;
   wnd_class_ = ::RegisterClassEx(&wcex);
   ASSERT(wnd_class_);
   return wnd_class_ != 0;
 }

 void MainWnd::CreateChildWindow(HWND* wnd, MainWnd::ChildWindowID id,
                                 const wchar_t* class_name, DWORD control_style,
                                 DWORD ex_style) {
   if (::IsWindow(*wnd))
     return;

   // Child windows are invisible at first, and shown after being resized.
   DWORD style = WS_CHILD | control_style;
   *wnd = ::CreateWindowEx(ex_style, class_name, L"", style,
                           100, 100, 100, 100, wnd_,
                           reinterpret_cast<HMENU>(id),
                           GetModuleHandle(NULL), NULL);
   ASSERT(::IsWindow(*wnd));
   ::SendMessage(*wnd, WM_SETFONT, reinterpret_cast<WPARAM>(GetDefaultFont()),
                 TRUE);
 }

 void MainWnd::CreateChildWindows() {
   // Create the child windows in tab order.
   CreateChildWindow(&label1_, LABEL1_ID, L"Static", ES_CENTER | ES_READONLY, 0);
   CreateChildWindow(&edit1_, EDIT_ID, L"Edit",
                     ES_LEFT | ES_NOHIDESEL | WS_TABSTOP, WS_EX_CLIENTEDGE);
   CreateChildWindow(&label2_, LABEL2_ID, L"Static", ES_CENTER | ES_READONLY, 0);
   CreateChildWindow(&edit2_, EDIT_ID, L"Edit",
                     ES_LEFT | ES_NOHIDESEL | WS_TABSTOP, WS_EX_CLIENTEDGE);
   CreateChildWindow(&button_, BUTTON_ID, L"Button", BS_CENTER | WS_TABSTOP, 0);

   CreateChildWindow(&listbox_, LISTBOX_ID, L"ListBox",
                     LBS_HASSTRINGS | LBS_NOTIFY, WS_EX_CLIENTEDGE);

   ::SetWindowTextA(edit1_, GetDefaultServerName().c_str());
   ::SetWindowTextA(edit2_, "8888");
 }

 void MainWnd::LayoutConnectUI(bool show) {
   struct Windows {
     HWND wnd;
     const wchar_t* text;
     size_t width;
     size_t height;
   } windows[] = {
     { label1_, L"Server" },
     { edit1_, L"XXXyyyYYYgggXXXyyyYYYggg" },
     { label2_, L":" },
     { edit2_, L"XyXyX" },
     { button_, L"Connect" },
   };

   if (show) {
     const size_t kSeparator = 5;
     size_t total_width = (ARRAYSIZE(windows) - 1) * kSeparator;

     for (size_t i = 0; i < ARRAYSIZE(windows); ++i) {
       CalculateWindowSizeForText(windows[i].wnd, windows[i].text,
                                  &windows[i].width, &windows[i].height);
       total_width += windows[i].width;
     }

     RECT rc;
     ::GetClientRect(wnd_, &rc);
     size_t x = (rc.right / 2) - (total_width / 2);
     size_t y = rc.bottom / 2;
     for (size_t i = 0; i < ARRAYSIZE(windows); ++i) {
       size_t top = y - (windows[i].height / 2);
       ::MoveWindow(windows[i].wnd, x, top, windows[i].width, windows[i].height,
                    TRUE);
       x += kSeparator + windows[i].width;
       if (windows[i].text[0] != 'X')
         ::SetWindowText(windows[i].wnd, windows[i].text);
       ::ShowWindow(windows[i].wnd, SW_SHOWNA);
     }
   } else {
     for (size_t i = 0; i < ARRAYSIZE(windows); ++i) {
       ::ShowWindow(windows[i].wnd, SW_HIDE);
     }
   }
 }

 void MainWnd::LayoutPeerListUI(bool show) {
   if (show) {
     RECT rc;
     ::GetClientRect(wnd_, &rc);
     ::MoveWindow(listbox_, 0, 0, rc.right, rc.bottom, TRUE);
     ::ShowWindow(listbox_, SW_SHOWNA);
   } else {
     ::ShowWindow(listbox_, SW_HIDE);
   }
 }

 void MainWnd::HandleTabbing() {
   bool shift = ((::GetAsyncKeyState(VK_SHIFT) & 0x8000) != 0);
   UINT next_cmd = shift ? GW_HWNDPREV : GW_HWNDNEXT;
   UINT loop_around_cmd = shift ? GW_HWNDLAST : GW_HWNDFIRST;
   HWND focus = GetFocus(), next;
   do {
     next = ::GetWindow(focus, next_cmd);
     if (IsWindowVisible(next) &&
         (GetWindowLong(next, GWL_STYLE) & WS_TABSTOP)) {
       break;
     }

     if (!next) {
       next = ::GetWindow(focus, loop_around_cmd);
       if (IsWindowVisible(next) &&
           (GetWindowLong(next, GWL_STYLE) & WS_TABSTOP)) {
         break;
       }
     }
     focus = next;
   } while (true);
   ::SetFocus(next);
 }
	/*
	* Copyright (c) 2011 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 "peerconnection/samples/client/main_wnd.h"

	#include "talk/base/common.h"
	#include "talk/base/logging.h"

	ATOM MainWnd::wnd_class_ = 0;
	const wchar_t MainWnd::kClassName[] = L"WebRTC_MainWnd";

	// TODO(tommi): declare in header:
	std::string GetDefaultServerName();

	namespace {
	void CalculateWindowSizeForText(HWND wnd, const wchar_t* text,
	size_t* width, size_t* height) {
	HDC dc = ::GetDC(wnd);
	RECT text_rc = {0};
	::DrawText(dc, text, -1, &text_rc, DT_CALCRECT \| DT_SINGLELINE);
	::ReleaseDC(wnd, dc);
	RECT client, window;
	::GetClientRect(wnd, &client);
	::GetWindowRect(wnd, &window);

	*width = text_rc.right - text_rc.left;
	*width += (window.right - window.left) -
	(client.right - client.left);
	*height = text_rc.bottom - text_rc.top;
	*height += (window.bottom - window.top) -
	(client.bottom - client.top);
	}

	HFONT GetDefaultFont() {
	static HFONT font = reinterpret_cast<HFONT>(GetStockObject(DEFAULT_GUI_FONT));
	return font;
	}

	std::string GetWindowText(HWND wnd) {
	char text[MAX_PATH] = {0};
	::GetWindowTextA(wnd, &text[0], ARRAYSIZE(text));
	return text;
	}

	void AddListBoxItem(HWND listbox, const std::string& str, LPARAM item_data) {
	LRESULT index = ::SendMessageA(listbox, LB_ADDSTRING, 0,
	reinterpret_cast<LPARAM>(str.c_str()));
	::SendMessageA(listbox, LB_SETITEMDATA, index, item_data);
	}

	} // namespace

	MainWnd::MainWnd()
	: ui_(CONNECT_TO_SERVER), wnd_(NULL), edit1_(NULL), edit2_(NULL),
	label1_(NULL), label2_(NULL), button_(NULL), listbox_(NULL),
	destroyed_(false), callback_(NULL), nested_msg_(NULL) {
	}

	MainWnd::~MainWnd() {
	ASSERT(!IsWindow());
	}

	bool MainWnd::Create() {
	ASSERT(wnd_ == NULL);
	if (!RegisterWindowClass())
	return false;

	wnd_ = ::CreateWindowExW(WS_EX_OVERLAPPEDWINDOW, kClassName, L"WebRTC",
	WS_OVERLAPPEDWINDOW \| WS_VISIBLE \| WS_CLIPCHILDREN,
	CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
	NULL, NULL, GetModuleHandle(NULL), this);

	::SendMessage(wnd_, WM_SETFONT, reinterpret_cast<WPARAM>(GetDefaultFont()),
	TRUE);

	CreateChildWindows();
	SwitchToConnectUI();

	return wnd_ != NULL;
	}

	bool MainWnd::Destroy() {
	BOOL ret = FALSE;
	if (IsWindow()) {
	ret = ::DestroyWindow(wnd_);
	}

	return ret != FALSE;
	}

	void MainWnd::RegisterObserver(MainWndCallback* callback) {
	callback_ = callback;
	}

	bool MainWnd::IsWindow() const {
	return wnd_ && ::IsWindow(wnd_) != FALSE;
	}

	bool MainWnd::PreTranslateMessage(MSG* msg) {
	bool ret = false;
	if (msg->message == WM_CHAR) {
	if (msg->wParam == VK_TAB) {
	HandleTabbing();
	ret = true;
	} else if (msg->wParam == VK_RETURN) {
	OnDefaultAction();
	ret = true;
	} else if (msg->wParam == VK_ESCAPE) {
	if (callback_) {
	if (ui_ == STREAMING) {
	callback_->DisconnectFromCurrentPeer();
	} else {
	callback_->DisconnectFromServer();
	}
	}
	}
	}
	return ret;
	}

	void MainWnd::SwitchToConnectUI() {
	ASSERT(IsWindow());
	LayoutPeerListUI(false);
	ui_ = CONNECT_TO_SERVER;
	LayoutConnectUI(true);
	::SetFocus(edit1_);
	}

	void MainWnd::SwitchToPeerList(const Peers& peers) {
	LayoutConnectUI(false);

	::SendMessage(listbox_, LB_RESETCONTENT, 0, 0);

	AddListBoxItem(listbox_, "List of currently connected peers:", -1);
	Peers::const_iterator i = peers.begin();
	for (; i != peers.end(); ++i)
	AddListBoxItem(listbox_, i->second.c_str(), i->first);

	ui_ = LIST_PEERS;
	LayoutPeerListUI(true);
	}

	void MainWnd::SwitchToStreamingUI() {
	LayoutConnectUI(false);
	LayoutPeerListUI(false);
	ui_ = STREAMING;
	}

	void MainWnd::OnPaint() {
	PAINTSTRUCT ps;
	::BeginPaint(handle(), &ps);

	RECT rc;
	::GetClientRect(handle(), &rc);
	HBRUSH brush = ::CreateSolidBrush(::GetSysColor(COLOR_WINDOW));
	::FillRect(ps.hdc, &rc, brush);
	::DeleteObject(brush);

	::EndPaint(handle(), &ps);
	}

	void MainWnd::OnDestroyed() {
	PostQuitMessage(0);
	}

	void MainWnd::OnDefaultAction() {
	if (!callback_)
	return;
	if (ui_ == CONNECT_TO_SERVER) {
	std::string server(GetWindowText(edit1_));
	std::string port_str(GetWindowText(edit2_));
	int port = port_str.length() ? atoi(port_str.c_str()) : 0;
	callback_->StartLogin(server, port);
	} else if (ui_ == LIST_PEERS) {
	LRESULT sel = ::SendMessage(listbox_, LB_GETCURSEL, 0, 0);
	if (sel != LB_ERR) {
	LRESULT peer_id = ::SendMessage(listbox_, LB_GETITEMDATA, sel, 0);
	if (peer_id != -1 && callback_) {
	callback_->ConnectToPeer(peer_id);
	}
	}
	} else {
	MessageBoxA(wnd_, "OK!", "Yeah", MB_OK);
	}
	}

	bool MainWnd::OnMessage(UINT msg, WPARAM wp, LPARAM lp, LRESULT* result) {
	switch (msg) {
	case WM_ERASEBKGND:
	*result = TRUE;
	return true;
	case WM_PAINT:
	OnPaint();
	return true;
	case WM_SETFOCUS:
	if (ui_ == CONNECT_TO_SERVER) {
	SetFocus(edit1_);
	}
	return true;
	case WM_SIZE:
	if (ui_ == CONNECT_TO_SERVER) {
	LayoutConnectUI(true);
	} else if (ui_ == LIST_PEERS) {
	LayoutPeerListUI(true);
	}
	break;
	case WM_CTLCOLORSTATIC:
	*result = reinterpret_cast<LRESULT>(GetSysColorBrush(COLOR_WINDOW));
	return true;
	case WM_COMMAND:
	if (button_ == reinterpret_cast<HWND>(lp)) {
	if (BN_CLICKED == HIWORD(wp))
	OnDefaultAction();
	} else if (listbox_ == reinterpret_cast<HWND>(lp)) {
	if (LBN_DBLCLK == HIWORD(wp)) {
	OnDefaultAction();
	}
	}
	return true;
	}
	return false;
	}

	// static
	LRESULT CALLBACK MainWnd::WndProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp) {
	MainWnd* me = reinterpret_cast<MainWnd*>(
	::GetWindowLongPtr(hwnd, GWL_USERDATA));
	if (!me && WM_CREATE == msg) {
	CREATESTRUCT* cs = reinterpret_cast<CREATESTRUCT*>(lp);
	me = reinterpret_cast<MainWnd*>(cs->lpCreateParams);
	me->wnd_ = hwnd;
	::SetWindowLongPtr(hwnd, GWL_USERDATA, reinterpret_cast<LONG_PTR>(me));
	}

	LRESULT result = 0;
	if (me) {
	void* prev_nested_msg = me->nested_msg_;
	me->nested_msg_ = &msg;

	bool handled = me->OnMessage(msg, wp, lp, &result);
	if (WM_NCDESTROY == msg) {
	me->destroyed_ = true;
	} else if (!handled) {
	result = ::DefWindowProc(hwnd, msg, wp, lp);
	}

	if (me->destroyed_ && prev_nested_msg == NULL) {
	me->OnDestroyed();
	me->wnd_ = NULL;
	me->destroyed_ = false;
	}

	me->nested_msg_ = prev_nested_msg;
	} else {
	result = ::DefWindowProc(hwnd, msg, wp, lp);
	}

	return result;
	}

	// static
	bool MainWnd::RegisterWindowClass() {
	if (wnd_class_)
	return true;

	WNDCLASSEX wcex = { sizeof(WNDCLASSEX) };
	wcex.style = CS_DBLCLKS;
	wcex.hInstance = GetModuleHandle(NULL);
	wcex.hbrBackground = reinterpret_cast<HBRUSH>(COLOR_WINDOW + 1);
	wcex.hCursor = ::LoadCursor(NULL, IDC_ARROW);
	wcex.lpfnWndProc = &WndProc;
	wcex.lpszClassName = kClassName;
	wnd_class_ = ::RegisterClassEx(&wcex);
	ASSERT(wnd_class_);
	return wnd_class_ != 0;
	}

	void MainWnd::CreateChildWindow(HWND* wnd, MainWnd::ChildWindowID id,
	const wchar_t* class_name, DWORD control_style,
	DWORD ex_style) {
	if (::IsWindow(*wnd))
	return;

	// Child windows are invisible at first, and shown after being resized.
	DWORD style = WS_CHILD \| control_style;
	*wnd = ::CreateWindowEx(ex_style, class_name, L"", style,
	100, 100, 100, 100, wnd_,
	reinterpret_cast<HMENU>(id),
	GetModuleHandle(NULL), NULL);
	ASSERT(::IsWindow(*wnd));
	::SendMessage(*wnd, WM_SETFONT, reinterpret_cast<WPARAM>(GetDefaultFont()),
	TRUE);
	}

	void MainWnd::CreateChildWindows() {
	// Create the child windows in tab order.
	CreateChildWindow(&label1_, LABEL1_ID, L"Static", ES_CENTER \| ES_READONLY, 0);
	CreateChildWindow(&edit1_, EDIT_ID, L"Edit",
	ES_LEFT \| ES_NOHIDESEL \| WS_TABSTOP, WS_EX_CLIENTEDGE);
	CreateChildWindow(&label2_, LABEL2_ID, L"Static", ES_CENTER \| ES_READONLY, 0);
	CreateChildWindow(&edit2_, EDIT_ID, L"Edit",
	ES_LEFT \| ES_NOHIDESEL \| WS_TABSTOP, WS_EX_CLIENTEDGE);
	CreateChildWindow(&button_, BUTTON_ID, L"Button", BS_CENTER \| WS_TABSTOP, 0);

	CreateChildWindow(&listbox_, LISTBOX_ID, L"ListBox",
	LBS_HASSTRINGS \| LBS_NOTIFY, WS_EX_CLIENTEDGE);

	::SetWindowTextA(edit1_, GetDefaultServerName().c_str());
	::SetWindowTextA(edit2_, "8888");
	}

	void MainWnd::LayoutConnectUI(bool show) {
	struct Windows {
	HWND wnd;
	const wchar_t* text;
	size_t width;
	size_t height;
	} windows[] = {
	{ label1_, L"Server" },
	{ edit1_, L"XXXyyyYYYgggXXXyyyYYYggg" },
	{ label2_, L":" },
	{ edit2_, L"XyXyX" },
	{ button_, L"Connect" },
	};

	if (show) {
	const size_t kSeparator = 5;
	size_t total_width = (ARRAYSIZE(windows) - 1) * kSeparator;

	for (size_t i = 0; i < ARRAYSIZE(windows); ++i) {
	CalculateWindowSizeForText(windows[i].wnd, windows[i].text,
	&windows[i].width, &windows[i].height);
	total_width += windows[i].width;
	}

	RECT rc;
	::GetClientRect(wnd_, &rc);
	size_t x = (rc.right / 2) - (total_width / 2);
	size_t y = rc.bottom / 2;
	for (size_t i = 0; i < ARRAYSIZE(windows); ++i) {
	size_t top = y - (windows[i].height / 2);
	::MoveWindow(windows[i].wnd, x, top, windows[i].width, windows[i].height,
	TRUE);
	x += kSeparator + windows[i].width;
	if (windows[i].text[0] != 'X')
	::SetWindowText(windows[i].wnd, windows[i].text);
	::ShowWindow(windows[i].wnd, SW_SHOWNA);
	}
	} else {
	for (size_t i = 0; i < ARRAYSIZE(windows); ++i) {
	::ShowWindow(windows[i].wnd, SW_HIDE);
	}
	}
	}

	void MainWnd::LayoutPeerListUI(bool show) {
	if (show) {
	RECT rc;
	::GetClientRect(wnd_, &rc);
	::MoveWindow(listbox_, 0, 0, rc.right, rc.bottom, TRUE);
	::ShowWindow(listbox_, SW_SHOWNA);
	} else {
	::ShowWindow(listbox_, SW_HIDE);
	}
	}

	void MainWnd::HandleTabbing() {
	bool shift = ((::GetAsyncKeyState(VK_SHIFT) & 0x8000) != 0);
	UINT next_cmd = shift ? GW_HWNDPREV : GW_HWNDNEXT;
	UINT loop_around_cmd = shift ? GW_HWNDLAST : GW_HWNDFIRST;
	HWND focus = GetFocus(), next;
	do {
	next = ::GetWindow(focus, next_cmd);
	if (IsWindowVisible(next) &&
	(GetWindowLong(next, GWL_STYLE) & WS_TABSTOP)) {
	break;
	}

	if (!next) {
	next = ::GetWindow(focus, loop_around_cmd);
	if (IsWindowVisible(next) &&
	(GetWindowLong(next, GWL_STYLE) & WS_TABSTOP)) {
	break;
	}
	}
	focus = next;
	} while (true);
	::SetFocus(next);
	}