分类： C/C++
2008-08-05 13:56:16
摘要 关键字 SplashScreen，原理 环境：Windows 98SE/2000，VC 6.0 注意：为避免实际所使用工程名给类或对象名带来的干扰，除非特别说明，在本文中将使用基类名如CWinApp、CMainFrame、CDialog来代替实际工程中的相应派生类名进行描述。
//类的声明
class CSplashWnd : public CWnd
{
CSplashWnd();
~CSplashWnd();
virtual void PostNcDestroy();
static void EnableSplashScreen(BOOL bEnable = TRUE);
static void ShowSplashScreen(CWnd* pParentWnd = NULL);
static BOOL PreTranslateAppMessage(MSG* pMsg);
BOOL Create(CWnd* pParentWnd = NULL);
void HideSplashScreen();
afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
afx_msg void OnPaint();
afx_msg void OnTimer(UINT nIDEvent);
CBitmap m_bitmap; //SplashScreen窗口显示用的位图对象
static BOOL c_bShowSplashWnd; //是否要显示SplashScreen的标志量
static CSplashWnd* c_pSplashWnd;
};
//是否使用SplashScreen
void CSplashWnd::EnableSplashScreen(BOOL bEnable)
{
c_bShowSplashWnd = bEnable;
}
//创建CsplashWnd对象，并调用Create()创建窗口
void CSplashWnd::ShowSplashScreen(CWnd* pParentWnd)
{
//如果不要显示SplashScreen或SplashWnd对象已经被创建则返回
if (!c_bShowSplashWnd || c_pSplashWnd != NULL)
return;
c_pSplashWnd = new CSplashWnd;
if (!c_pSplashWnd->Create(pParentWnd))
delete c_pSplashWnd;
else
c_pSplashWnd->UpdateWindow();
}
//装入SplashScreen欲显示位图，通过CreateEx()激发OnCreate()完成窗口创建与设置
BOOL CSplashWnd::Create(CWnd* pParentWnd)
{
if (!m_bitmap.LoadBitmap(IDB_SPLASH))
return FALSE;
BITMAP bm;
m_bitmap.GetBitmap(&bm);
return CreateEx(0,
AfxRegisterWndClass(0,AfxGetApp()->LoadStandardCursor(IDC_ARROW)),
NULL,
WS_POPUP | WS_VISIBLE,
0,
0,
bm.bmWidth,
bm.bmHeight,
pParentWnd->GetSafeHwnd(),
NULL);
}
//销毁窗口，刷新框架
void CSplashWnd::HideSplashScreen()
{
DestroyWindow();
AfxGetMainWnd()->UpdateWindow();
}
//利用窗口创建结构创建窗口，并设置定时器在750ms后触发OnTimer()
int CSplashWnd::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CWnd::OnCreate(lpCreateStruct) == -1)
return -1;
CenterWindow(); //窗口居中显示
SetTimer(1, 750, NULL); //设置定时器
return 0;
}
//将键盘和鼠标消息传递给CSplashWnd对象，以销毁窗口BOOL CSplashWnd::PreTranslateAppMessage(MSG* pMsg)
{
if (c_pSplashWnd == NULL)
return FALSE;
if (pMsg->message == WM_KEYDOWN ||
pMsg->message == WM_SYSKEYDOWN ||
pMsg->message == WM_LBUTTONDOWN ||
pMsg->message == WM_RBUTTONDOWN ||
pMsg->message == WM_MBUTTONDOWN ||
pMsg->message == WM_NCLBUTTONDOWN ||
pMsg->message == WM_NCRBUTTONDOWN ||
pMsg->message == WM_NCMBUTTONDOWN)
{
c_pSplashWnd->HideSplashScreen();
return TRUE;
}
return FALSE;
}
void CSplashWnd::OnTimer(UINT nIDEvent)
{
HideSplashScreen();
}
再看看CWinApp和CMainFrame类中发生了什么样的改变：
int CMyDialog::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CDialog::OnCreate(lpCreateStruct) == -1)
return -1;
CSplashWnd::ShowSplashScreen(this);
return 0;
}
(2)利用ClassWizard为CWinApp添加消息转发处理函数PreTranslateMessage()；
BOOL CWinApp::PreTranslateMessage(MSG* pMsg)
{
if (CSplashWnd::PreTranslateAppMessage(pMsg))
return TRUE;
return CWinApp::PreTranslateMessage(pMsg);
}
(3)CWinApp::InitInstance()中加入如下调用：
CSplashWnd::EnableSplashScreen(TRUE);