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如何创建动画控件

  • 项目

本主题演示了如何创建动画控件。 随附的 C++ 代码示例在对话框中创建了一个动画控件。 它将动画控件放置在指定控件的下方，并根据音频视频交错 (AVI) 剪辑中帧的尺寸来设置动画控件的尺寸。

需要了解的事项

技术

先决条件

  • C/C++
  • Windows 用户界面编程
  • AVI 文件

说明

步骤 1：创建一个动画控件实例。

使用 Animate_Create 宏来创建动画控件实例。

// IDC_ANIMATE - identifier of the animation control. 
// hwndDlg - handle to the dialog box.
RECT rc;
hwndAnim = Animate_Create(hwndDlg, IDC_ANIMATE, 
    WS_BORDER | WS_CHILD, g_hinst);

步骤 2：定位动画控件。

获取指定控件按钮的屏幕坐标。

// nIDCtl - identifier of the control below which the animation control is to be positioned.
GetWindowRect(GetDlgItem(hwndDlg, nIDCtl), &rc);

将左下角的坐标转换为客户端坐标。

POINT pt;
pt.x = rc.left; 
pt.y = rc.bottom; 
ScreenToClient(hwndDlg, &pt);

将动画控件定位在指定控件按钮的下方。

// CX_FRAME, CY_FRAME - width and height of the frames in the AVI clip.      
SetWindowPos(hwndAnim, 0, pt.x, pt.y + 20, 
    CX_FRAME, CY_FRAME, 
    SWP_NOZORDER | SWP_DRAWFRAME);

步骤 3：打开 AVI 剪辑。

调用 Animate_Open 宏以打开 AVI 剪辑，并在动画控件中显示第一帧。 调用 ShowWindow 函数以便让动画控件可见。

Animate_Open(hwndAnim, "SEARCH.AVI"); 
ShowWindow(hwndAnim, SW_SHOW);

完整示例

// CreateAnimationCtrl - creates an animation control, positions it 
//                       below the specified control in a dialog box, 
//                       and opens the AVI clip for the animation control. 
// Returns the handle to the animation control. 
// hwndDlg             - handle to the dialog box. 
// nIDCtl              - identifier of the control below which the animation control 
//                       is to be positioned. 
// 
// Constants 
//     IDC_ANIMATE - identifier of the animation control. 
//     CX_FRAME, CY_FRAME - width and height of the frames 
//     in the AVI clip. 

HWND CreateAnimationCtrl(HWND hwndDlg, int nIDCtl) 
{ 
    HWND hwndAnim = NULL;    
    
    // Create the animation control.
    // IDC_ANIMATE - identifier of the animation control. 
    // hwndDlg - handle to the dialog box.
    RECT rc;
    hwndAnim = Animate_Create(hwndDlg, IDC_ANIMATE, 
        WS_BORDER | WS_CHILD, g_hinst); 

    // Get the screen coordinates of the specified control button.
    // nIDCtl - identifier of the control below which the animation control is to be positioned.
    GetWindowRect(GetDlgItem(hwndDlg, nIDCtl), &rc); 

    // Convert the coordinates of the lower-left corner to 
    // client coordinates.
    POINT pt;
    pt.x = rc.left; 
    pt.y = rc.bottom; 
    ScreenToClient(hwndDlg, &pt); 

    // Position the animation control below the Stop button.
    // CX_FRAME, CY_FRAME - width and height of the frames in the AVI clip.      
    SetWindowPos(hwndAnim, 0, pt.x, pt.y + 20, 
        CX_FRAME, CY_FRAME, 
        SWP_NOZORDER | SWP_DRAWFRAME);

    // Open the AVI clip, and show the animation control.
    Animate_Open(hwndAnim, "SEARCH.AVI"); 
    ShowWindow(hwndAnim, SW_SHOW); 

    return hwndAnim; 
}

关于动画控件

动画控件参考

使用动画控件

动画