使用 IVMRWindowlessControl 在 Winforms 控件中显示视频并允许全屏切换

Question

我最近在自定义 Winforms 控件中从使用 IVideoWindow 接口切换到使用 IVMRWindowlessControl 来显示视频。

这样做的原因是为了允许控件内的视频具有缩放功能。
然而，在切换时，我发现 IVideoWindow 的全屏模式不可用，我目前正在尝试使用 SetVideoWindow() 方法复制此模式。

我发现我将控件中的视频大小调整为与屏幕的分辨率相同，但是我无法让控件将其自身定位到屏幕的顶部/左侧并成为最顶部的窗口。

既然 IVideoWindow::put_FullScreenMode 已经为您完成了这一切，那么关于如何实现这一点有什么想法吗？

Answer 1

通过以新的形式托管视频控件来解决全屏问题，我将其大小调整为当前屏幕的大小，然后处理形式中的“Escape”按键，以切换回正常大小的视频。以下是代码摘录：-

成员

    private Rectangle fullScreenRectangle;
    private bool fullScreen;
    private Form fullScreenForm;
    private Control fullScreenParent;

切换全屏代码

    /// <summary>
    /// Toggle Full Screen Mode
    /// </summary>
    public bool FullScreen
    {
        get
        {
            return this.fullScreen;
        }
        set
        {
            this.fullScreen = value;

            if (this.fullScreen)
            {
                // If switch to full screen, save the current size of the control
                this.fullScreenRectangle = new Rectangle(this.Location, this.Size);

                // Get the current screen resolution and set that to be the control's size
                Rectangle screenRect = Screen.GetBounds(this);

                // Create a new form on which to host the control whilst we go to full screen mode.
                this.fullScreenForm = new Form();
                this.fullScreenForm.Location = PointToScreen(new Point(0, 0));
                this.fullScreenForm.Size = new Size(screenRect.Width, screenRect.Height);
                this.fullScreenForm.BackColor = Color.Black;
                this.fullScreenForm.ShowInTaskbar = false;
                this.fullScreenForm.ShowIcon = false;
                this.fullScreenForm.FormBorderStyle = FormBorderStyle.None;
                this.fullScreenForm.KeyPreview = true;
                this.fullScreenForm.PreviewKeyDown += new PreviewKeyDownEventHandler(fullScreenForm_PreviewKeyDown);
                this.fullScreenParent = this.Parent;
                this.fullScreenForm.Controls.Add(this);
                this.fullScreenForm.Show();

                this.windowlessControl.SetVideoPosition(null, screenRect);
            }
            else
            {
                // Revert to the original control size
                this.Location = PointToScreen(new Point(this.fullScreenRectangle.Left, this.fullScreenRectangle.Top));
                this.Size = new Size(this.fullScreenRectangle.Width, this.fullScreenRectangle.Height);

                this.windowlessControl.SetVideoPosition(null, this.fullScreenRectangle);

                if (this.fullScreenForm != null)
                {
                    this.fullScreenForm.Controls.Remove(this);

                    if (this.fullScreenParent != null)
                        this.Parent = this.fullScreenParent;

                    this.fullScreenForm.PreviewKeyDown -= new PreviewKeyDownEventHandler(fullScreenForm_PreviewKeyDown);
                    this.fullScreenForm.Close();
                }
            }
        }
    }

    void fullScreenForm_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
    {
        if (e.KeyCode == Keys.Escape)
        {
            var viewer = this.Controls[0] as ViewerControl;

            if (viewer != null)
                viewer.FullScreen = false;
        }
    }