CWindowWnd代码在UIBase.h和UIBase.cpp文件里。主要实现的是一个基本窗口的创建与消息处理。
相关代码：
头文件：
class UILIB_API CWindowWnd
{
public:
CWindowWnd(); HWND GetHWND() const;
operator HWND() const; bool RegisterWindowClass();
bool RegisterSuperclass(); HWND Create(HWND hwndParent, LPCTSTR pstrName, DWORD dwStyle, DWORD dwExStyle, const RECT rc, HMENU hMenu = NULL);
HWND Create(HWND hwndParent, LPCTSTR pstrName, DWORD dwStyle, DWORD dwExStyle, int x = CW_USEDEFAULT, int y = CW_USEDEFAULT, int cx = CW_USEDEFAULT, int cy = CW_USEDEFAULT, HMENU hMenu = NULL);
HWND CreateDuiWindow(HWND hwndParent, LPCTSTR pstrWindowName,DWORD dwStyle =, DWORD dwExStyle =);
HWND Subclass(HWND hWnd);
void Unsubclass();
void ShowWindow(bool bShow = true, bool bTakeFocus = true);
UINT ShowModal();
void Close(UINT nRet = IDOK);
void CenterWindow(); // 居中，支持扩展屏幕
void SetIcon(UINT nRes); LRESULT SendMessage(UINT uMsg, WPARAM wParam = , LPARAM lParam = 0L);
LRESULT PostMessage(UINT uMsg, WPARAM wParam = , LPARAM lParam = 0L);
void ResizeClient(int cx = -, int cy = -); protected:
virtual LPCTSTR GetWindowClassName() const = ;
virtual LPCTSTR GetSuperClassName() const;
virtual UINT GetClassStyle() const; virtual LRESULT HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam);
virtual void OnFinalMessage(HWND hWnd); static LRESULT CALLBACK __WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
static LRESULT CALLBACK __ControlProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam); protected:
HWND m_hWnd;
WNDPROC m_OldWndProc;
bool m_bSubclassed;
};
源文件：
//////////////////////////////////////////////////////////////////////////
///
CWindowWnd::CWindowWnd() : m_hWnd(NULL), m_OldWndProc(::DefWindowProc), m_bSubclassed(false)
{
} HWND CWindowWnd::GetHWND() const
{
return m_hWnd;
} UINT CWindowWnd::GetClassStyle() const
{
return ;
} LPCTSTR CWindowWnd::GetSuperClassName() const
{
return NULL;
} CWindowWnd::operator HWND() const
{
return m_hWnd;
} HWND CWindowWnd::CreateDuiWindow( HWND hwndParent, LPCTSTR pstrWindowName,DWORD dwStyle /*=0*/, DWORD dwExStyle /*=0*/ )
{
return Create(hwndParent,pstrWindowName,dwStyle,dwExStyle,,,,,NULL);
} HWND CWindowWnd::Create(HWND hwndParent, LPCTSTR pstrName, DWORD dwStyle, DWORD dwExStyle, const RECT rc, HMENU hMenu)
{
return Create(hwndParent, pstrName, dwStyle, dwExStyle, rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, hMenu);
} //调用创建win32创建窗口的API
//如果是控件则GetSuperClassName返回非NULL 调用RegisterSuperclass
//否则调用RegisterWindowClass
//然后使用CreateWindowEx创建窗口
HWND CWindowWnd::Create(HWND hwndParent, LPCTSTR pstrName, DWORD dwStyle, DWORD dwExStyle, int x, int y, int cx, int cy, HMENU hMenu)
{
if( GetSuperClassName() != NULL && !RegisterSuperclass() ) return NULL;
if( GetSuperClassName() == NULL && !RegisterWindowClass() ) return NULL;
m_hWnd = ::CreateWindowEx(dwExStyle, GetWindowClassName(), pstrName, dwStyle, x, y, cx, cy, hwndParent, hMenu, CPaintManagerUI::GetInstance(), this);
ASSERT(m_hWnd!=NULL);
return m_hWnd;
} //子类化一个控件 m_OldWndProc 保存旧消息处理函数
HWND CWindowWnd::Subclass(HWND hWnd)
{
ASSERT(::IsWindow(hWnd));
ASSERT(m_hWnd==NULL);
m_OldWndProc = SubclassWindow(hWnd, __WndProc);
if( m_OldWndProc == NULL ) return NULL;
m_bSubclassed = true;
m_hWnd = hWnd;
::SetWindowLongPtr(hWnd, GWLP_USERDATA, reinterpret_cast<LPARAM>(this));
return m_hWnd;
} //恢复之类化的控件
void CWindowWnd::Unsubclass()
{
ASSERT(::IsWindow(m_hWnd));
if( !::IsWindow(m_hWnd) ) return;
if( !m_bSubclassed ) return;
SubclassWindow(m_hWnd, m_OldWndProc);
m_OldWndProc = ::DefWindowProc;
m_bSubclassed = false;
} void CWindowWnd::ShowWindow(bool bShow /*= true*/, bool bTakeFocus /*= false*/)
{
ASSERT(::IsWindow(m_hWnd));
if( !::IsWindow(m_hWnd) ) return;
::ShowWindow(m_hWnd, bShow ? (bTakeFocus ? SW_SHOWNORMAL : SW_SHOWNOACTIVATE) : SW_HIDE);
} //实现一个modal窗口
UINT CWindowWnd::ShowModal()
{
ASSERT(::IsWindow(m_hWnd));
UINT nRet = ;
HWND hWndParent = GetWindowOwner(m_hWnd);
::ShowWindow(m_hWnd, SW_SHOWNORMAL);
::EnableWindow(hWndParent, FALSE);
MSG msg = { };
while( ::IsWindow(m_hWnd) && ::GetMessage(&msg, NULL, , ) ) {
if( msg.message == WM_CLOSE && msg.hwnd == m_hWnd ) {
nRet = msg.wParam;
::EnableWindow(hWndParent, TRUE);
::SetFocus(hWndParent);
}
if( !CPaintManagerUI::TranslateMessage(&msg) ) {
::TranslateMessage(&msg);
::DispatchMessage(&msg);
}
if( msg.message == WM_QUIT ) break;
}
::EnableWindow(hWndParent, TRUE);
::SetFocus(hWndParent);
if( msg.message == WM_QUIT ) ::PostQuitMessage(msg.wParam);
return nRet;
} void CWindowWnd::Close(UINT nRet)
{
ASSERT(::IsWindow(m_hWnd));
if( !::IsWindow(m_hWnd) ) return;
PostMessage(WM_CLOSE, (WPARAM)nRet, 0L);
} void CWindowWnd::CenterWindow()
{
ASSERT(::IsWindow(m_hWnd));
ASSERT((GetWindowStyle(m_hWnd)&WS_CHILD)==);
RECT rcDlg = { };
::GetWindowRect(m_hWnd, &rcDlg);
RECT rcArea = { };
RECT rcCenter = { };
HWND hWnd=*this;
HWND hWndParent = ::GetParent(m_hWnd);
HWND hWndCenter = ::GetWindowOwner(m_hWnd);
if (hWndCenter!=NULL)
hWnd=hWndCenter; // 处理多显示器模式下屏幕居中
MONITORINFO oMonitor = {};
oMonitor.cbSize = sizeof(oMonitor);
::GetMonitorInfo(::MonitorFromWindow(hWnd, MONITOR_DEFAULTTONEAREST), &oMonitor);
rcArea = oMonitor.rcWork; if( hWndCenter == NULL )
rcCenter = rcArea;
else
::GetWindowRect(hWndCenter, &rcCenter); int DlgWidth = rcDlg.right - rcDlg.left;
int DlgHeight = rcDlg.bottom - rcDlg.top; // Find dialog's upper left based on rcCenter
int xLeft = (rcCenter.left + rcCenter.right) / - DlgWidth / ;
int yTop = (rcCenter.top + rcCenter.bottom) / - DlgHeight / ; // The dialog is outside the screen, move it inside
if( xLeft < rcArea.left ) xLeft = rcArea.left;
else if( xLeft + DlgWidth > rcArea.right ) xLeft = rcArea.right - DlgWidth;
if( yTop < rcArea.top ) yTop = rcArea.top;
else if( yTop + DlgHeight > rcArea.bottom ) yTop = rcArea.bottom - DlgHeight;
::SetWindowPos(m_hWnd, NULL, xLeft, yTop, -, -, SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
} //从资源设置图标
void CWindowWnd::SetIcon(UINT nRes)
{
HICON hIcon = (HICON)::LoadImage(CPaintManagerUI::GetInstance(), MAKEINTRESOURCE(nRes), IMAGE_ICON,
(::GetSystemMetrics(SM_CXICON) + ) & ~, (::GetSystemMetrics(SM_CYICON) + ) & ~, // 防止高DPI下图标模糊
LR_DEFAULTCOLOR);
ASSERT(hIcon);
::SendMessage(m_hWnd, WM_SETICON, (WPARAM) ICON_SMALL, (LPARAM) hIcon); hIcon = (HICON)::LoadImage(CPaintManagerUI::GetInstance(), MAKEINTRESOURCE(nRes), IMAGE_ICON,
(::GetSystemMetrics(SM_CXICON) + ) & ~, (::GetSystemMetrics(SM_CYICON) + ) & ~, // 防止高DPI下图标模糊
LR_DEFAULTCOLOR);
ASSERT(hIcon);
::SendMessage(m_hWnd, WM_SETICON, (WPARAM) ICON_BIG, (LPARAM) hIcon);
} bool CWindowWnd::RegisterWindowClass()
{
WNDCLASS wc = { };
wc.style = GetClassStyle();
wc.cbClsExtra = ;
wc.cbWndExtra = ;
wc.hIcon = NULL;
wc.lpfnWndProc = CWindowWnd::__WndProc;
wc.hInstance = CPaintManagerUI::GetInstance();
wc.hCursor = ::LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = NULL;
wc.lpszMenuName = NULL;
wc.lpszClassName = GetWindowClassName();
ATOM ret = ::RegisterClass(&wc);
ASSERT(ret!=NULL || ::GetLastError()==ERROR_CLASS_ALREADY_EXISTS);
return ret != NULL || ::GetLastError() == ERROR_CLASS_ALREADY_EXISTS;
} //这里应该是创建一个控件类，子类化过的
bool CWindowWnd::RegisterSuperclass()
{
// Get the class information from an existing
// window so we can subclass it later on...
WNDCLASSEX wc = { };
wc.cbSize = sizeof(WNDCLASSEX);
if( !::GetClassInfoEx(NULL, GetSuperClassName(), &wc) ) {
if( !::GetClassInfoEx(CPaintManagerUI::GetInstance(), GetSuperClassName(), &wc) ) {
ASSERT(!"Unable to locate window class");
return NULL;
}
}
m_OldWndProc = wc.lpfnWndProc;
wc.lpfnWndProc = CWindowWnd::__ControlProc;
wc.hInstance = CPaintManagerUI::GetInstance();
wc.lpszClassName = GetWindowClassName();
ATOM ret = ::RegisterClassEx(&wc);
ASSERT(ret!=NULL || ::GetLastError()==ERROR_CLASS_ALREADY_EXISTS);
return ret != NULL || ::GetLastError() == ERROR_CLASS_ALREADY_EXISTS;
} //默认的消息处理函数 注册窗口时使用过
LRESULT CALLBACK CWindowWnd::__WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
CWindowWnd* pThis = NULL;
if( uMsg == WM_NCCREATE ) {
//首次创建窗口时调用
LPCREATESTRUCT lpcs = reinterpret_cast<LPCREATESTRUCT>(lParam);
pThis = static_cast<CWindowWnd*>(lpcs->lpCreateParams);
pThis->m_hWnd = hWnd;
::SetWindowLongPtr(hWnd, GWLP_USERDATA, reinterpret_cast<LPARAM>(pThis));
}
else {
pThis = reinterpret_cast<CWindowWnd*>(::GetWindowLongPtr(hWnd, GWLP_USERDATA));
//销毁窗口时调用
if( uMsg == WM_NCDESTROY && pThis != NULL ) {
//把消息传递到上一层
LRESULT lRes = ::CallWindowProc(pThis->m_OldWndProc, hWnd, uMsg, wParam, lParam);
::SetWindowLongPtr(pThis->m_hWnd, GWLP_USERDATA, 0L);
//如果已经子类化了，则恢复
if( pThis->m_bSubclassed ) pThis->Unsubclass();
pThis->m_hWnd = NULL;
//调用OnFinalMessage OnFinalMessage一般做最后的处理
pThis->OnFinalMessage(hWnd);
return lRes;
}
}
if( pThis != NULL ) {
//调用HandleMessage来处理消息
return pThis->HandleMessage(uMsg, wParam, lParam);
}
else {
return ::DefWindowProc(hWnd, uMsg, wParam, lParam);
}
} //控件的消息处理函数
LRESULT CALLBACK CWindowWnd::__ControlProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
CWindowWnd* pThis = NULL;
if( uMsg == WM_NCCREATE ) {
LPCREATESTRUCT lpcs = reinterpret_cast<LPCREATESTRUCT>(lParam);
pThis = static_cast<CWindowWnd*>(lpcs->lpCreateParams);
::SetProp(hWnd, _T("WndX"), (HANDLE) pThis);
pThis->m_hWnd = hWnd;
}
else {
pThis = reinterpret_cast<CWindowWnd*>(::GetProp(hWnd, _T("WndX")));
if( uMsg == WM_NCDESTROY && pThis != NULL ) {
LRESULT lRes = ::CallWindowProc(pThis->m_OldWndProc, hWnd, uMsg, wParam, lParam);
if( pThis->m_bSubclassed ) pThis->Unsubclass();
::SetProp(hWnd, _T("WndX"), NULL);
pThis->m_hWnd = NULL;
pThis->OnFinalMessage(hWnd);
return lRes;
}
}
if( pThis != NULL ) {
return pThis->HandleMessage(uMsg, wParam, lParam);
}
else {
return ::DefWindowProc(hWnd, uMsg, wParam, lParam);
}
} LRESULT CWindowWnd::SendMessage(UINT uMsg, WPARAM wParam /*= 0*/, LPARAM lParam /*= 0*/)
{
ASSERT(::IsWindow(m_hWnd));
return ::SendMessage(m_hWnd, uMsg, wParam, lParam);
} LRESULT CWindowWnd::PostMessage(UINT uMsg, WPARAM wParam /*= 0*/, LPARAM lParam /*= 0*/)
{
ASSERT(::IsWindow(m_hWnd));
return ::PostMessage(m_hWnd, uMsg, wParam, lParam);
} void CWindowWnd::ResizeClient(int cx /*= -1*/, int cy /*= -1*/)
{
ASSERT(::IsWindow(m_hWnd));
RECT rc = { };
if( !::GetClientRect(m_hWnd, &rc) ) return;
if( cx != - ) rc.right = cx;
if( cy != - ) rc.bottom = cy;
if( !::AdjustWindowRectEx(&rc, GetWindowStyle(m_hWnd), (!(GetWindowStyle(m_hWnd) & WS_CHILD) && (::GetMenu(m_hWnd) != NULL)), GetWindowExStyle(m_hWnd)) ) return;
::SetWindowPos(m_hWnd, NULL, , , rc.right - rc.left, rc.bottom - rc.top, SWP_NOZORDER | SWP_NOMOVE | SWP_NOACTIVATE);
} //虚函数 用于在子类里重写此函数接管消息
LRESULT CWindowWnd::HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam)
{
return ::CallWindowProc(m_OldWndProc, m_hWnd, uMsg, wParam, lParam);
} void CWindowWnd::OnFinalMessage(HWND /*hWnd*/)
{
} //////////////////////////////////////////////////////////////////////////
流程：
调用Create创建一个窗口，使用RegisterSuperclass或RegisterWindowClass注册类，调用CreateWindowEx创建窗口返回句柄。
RegisterSuperclass使用CWindowWnd::__ControlProc作为窗口消息处理函数，
RegisterWindowClass使用CWindowWnd::__WndProc作为消息处理函数。
两个消息处理函数除了WM_NCDESTROY以外其他消息都通过HandleMessage来处理，所以继承类中只要重载HandleMessage就可以处理大部分消息了。