MFC浮动对话框，键盘消息屏蔽和CImageList动画

最近开始学习VC，今天突发心情，想弄个像网页里常见的浮动gif动画，想来想去用个笨方法实现了，不管怎么说，在桌面上飘来飘去的图片，足够搏MM一笑了。要是打开两个，就像梁祝双飞蝶。

1.键盘消息屏蔽

我把键盘消息屏蔽了，只留下了一个字符“~”来进行退出操作，个人用途呵呵。

BOOL CRunOnceDlg::OnCommand(WPARAM wParam, LPARAM lParam) 
{
    if(wParam==WM_DESTROY) //是退出则继续
        return CDialog::OnCommand(wParam, lParam);
    else //不是退出就滤掉命令返回
        return TRUE;
}

BOOL CRunOnceDlg::PreTranslateMessage(MSG* pMsg) 
{
    switch(pMsg->message)
    {
        case WM_KEYDOWN:
        case WM_KEYUP:
        case WM_DEADCHAR:
        case WM_SYSKEYDOWN:
        case WM_SYSKEYUP:
        case WM_SYSCHAR:
        case WM_SYSDEADCHAR:
        case WM_KEYLAST:
            {
                //是ESC则过滤之
                if(pMsg->wParam==VK_ESCAPE)
                    return TRUE;
                break;
            }
        case WM_CHAR:
            {
                //是“~”则退出
                if(pMsg->wParam=='~')
                    PostQuitMessage(0);
                break;
            }
    }

    return CDialog::PreTranslateMessage(pMsg);
}

void CRunOnceDlg::OnClose() 
{
    //屏蔽Alt+F4消息
    //CDialog::OnClose();
}

 

2.对话框浮动

在OnInitDialog()里设置一个定时器SetTimer(2, 20, NULL);

void CRunOnceDlg::OnTimer(UINT nIDEvent) 
{
    static LONG nImg = 0;

    switch(nIDEvent)
    {

        case 2:
            {
                if(rate>dlen) //更新行程
                {
                    dlen = rand()%100+100;
                    angle += (rand()%180-90)*PI/180;
                }
                else //一次行程尚未结束
                {
                    dlen -= rate;
                }

                LONG dx = LONG(cos(angle)*rate);
                LONG dy = LONG(sin(angle)*rate);

                CRect rect;
                GetWindowRect(&rect);

                if((rect.left+dx)<0 || (rect.right+dx)>cxfull)
                { //左右出屏
                    angle = PI-angle;
                    dx = LONG(cos(angle)*rate);
                    dy = LONG(sin(angle)*rate);
                }

                if((rect.top+dy)<0 || (rect.bottom+dy)>cyfull)
                { //上下出屏
                    angle = -angle;
                    dx = LONG(cos(angle)*rate);
                    dy = LONG(sin(angle)*rate);
                }

                SetWindowPos(NULL, rect.left+dx, rect.top+dy, NULL, NULL, SWP_NOSIZE|SWP_NOZORDER);
            }
            break;
    }

    CDialog::OnTimer(nIDEvent);
}

 

3.CImageList动画

首先要定义一个CImageList，初始化后定时draw，古老的东西。

    ImgList.Create(IMG_WIDTH, IMG_HEIGHT, ILC_COLOR24, 4, 1);
    CBitmap bmp;

    bmp.LoadBitmap(IDB_BITMAP1);
    ImgList.Add(&bmp, RGB(0,0,0));
    bmp.DeleteObject();

    bmp.LoadBitmap(IDB_BITMAP2);
    ImgList.Add(&bmp, RGB(0,0,0));
    bmp.DeleteObject();

    bmp.LoadBitmap(IDB_BITMAP3);
    ImgList.Add(&bmp, RGB(0,0,0));
    bmp.DeleteObject();

    bmp.LoadBitmap(IDB_BITMAP4);
    ImgList.Add(&bmp, RGB(0,0,0));
    bmp.DeleteObject();

    SetTimer(1, 500, NULL);

void CRunOnceDlg::OnTimer(UINT nIDEvent) 
{
    static LONG nImg = 0;

    switch(nIDEvent)
    {
        case 1:
            {
                CDC * pDC = GetDC();
                ImgList.Draw(pDC, nImg, CPoint(0, 0), 0);
                ReleaseDC(pDC);

                if(nImg<3)
                    nImg++;
                else
                    nImg=0;
            }
            break;

    }

    CDialog::OnTimer(nIDEvent);
}

 

4.对话框的拖动

对话框的样式为无标题栏无边框，拖动的时候采用欺骗系统的方法，让系统以为是按在标题栏上。

UINT CRunOnceDlg::OnNcHitTest(CPoint point) 
{
    CRect rc;
    GetClientRect(&rc);
    ClientToScreen(&rc);

    return rc.PtInRect(point) ? HTCAPTION : CDialog::OnNcHitTest(point);
}

最后再给个源代码的下载，新手交流。
/Files/God4/LoveWorm.rar