对话框的渐变显示以及退出

在实现定时对话框的操作过程中，我们可以在对话框的显示以及退出过程中，加入渐变过程，

void CMsgWnd::CreateMsgWindow() { // RECT rect; // SystemParametersInfo(SPI_GETWORKAREA,0,&rect,0); // int y=rect.bottom-rect.top; // int x=rect.right-rect.left; // x=x-WIN_WIDTH; // y=y-WIN_HEIGHT; CreateEx(0, AfxRegisterWndClass( 0, ::LoadCursor(AfxGetInstanceHandle(),MAKEINTRESOURCE(IDC_HAND_1)),(HBRUSH)(COLOR_DESKTOP+1),NULL), "", WS_POPUP|WS_EX_TOPMOST, 0, 0, 0,//bmBitmap.bmWidth, //Bitmap Width = Splash Window Width 0,//bmBitmap.bmHeight, //Bitmap Height = Splash Window Height NULL,//AfxGetMainWnd()->GetSafeHwnd(), NULL, NULL); SetTimer(ID_TIMER_POP_WINDOW,20,NULL); }

创建窗口，这里窗口大小为0，并设置定时器，在定时器中对对话框的显示以及关闭作处理。

void CMsgWnd::OnTimer(UINT nIDEvent) { static int nHeight=0; int cy=GetSystemMetrics(SM_CYSCREEN); int cx=GetSystemMetrics(SM_CXSCREEN); RECT rect; SystemParametersInfo(SPI_GETWORKAREA,0,&rect,0); int y=rect.bottom-rect.top; int x=rect.right-rect.left; x=x-WIN_WIDTH; switch(nIDEvent) { case ID_TIMER_POP_WINDOW: if(nHeight<=WIN_HEIGHT) { ++nHeight; MoveWindow(x, y-nHeight, WIN_WIDTH, WIN_HEIGHT); Invalidate(FALSE); } else { KillTimer(ID_TIMER_POP_WINDOW); SetTimer(ID_TIMER_DISPLAY_DELAY,5000,NULL); } break; case ID_TIMER_CLOSE_WINDOW: if(nHeight>=0) { nHeight--; MoveWindow(x, y-nHeight, WIN_WIDTH, nHeight); } else { KillTimer(ID_TIMER_CLOSE_WINDOW); SendMessage(WM_CLOSE); } break; case ID_TIMER_DISPLAY_DELAY: KillTimer(ID_TIMER_DISPLAY_DELAY); SetTimer(ID_TIMER_CLOSE_WINDOW,20,NULL); break; } CWnd::OnTimer(nIDEvent); }

显示时，逐渐改变窗口的纵坐标，知道完全显示，然后设置延时定时器，在延时定时器中逐渐改变对话框大小，直到消失。