DragMove（）问题，请帮忙！

问题描述

好​​吧，我的问题是关于WPF中的 DragMove（）方法，当我使用时这个方法在 MouseLeftButtonDown 事件之后，它不起作用其他命令 OnMouseLeftButtonUp 事件。



请告诉我如何在 DragMove 之后显示消息。

Hi,

Ok, my problem is about DragMove() method in WPF, when I use this method on MouseLeftButtonDown event, after it don't work other commands OnMouseLeftButtonUp event.

Please tell me how to show the message after DragMove.

public partial class myWindow : Window
{
    public myWindow()
    {
        this.InitializeComponent();
    }

    protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
    {
        DragMove();
        base.OnMouseLeftButtonDown(e);
    }

    protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
    {
        MessageBox.Show("this is a test");
        base.OnMouseLeftButtonUp(e);
    }
}

另外，我试图模拟 DragMove ，但它无法正常工作！实际上，当我快速移动窗口时，它不会保留光标！

In addition, I tried to simulate the DragMove, but it doesn't work correctly! actually, when I move the window to around quickly, it don't remain with cursor!

public partial class myWindow : Window
{
    public myWindow()
    {
        this.InitializeComponent();

        inDrag = false;
    }

    bool inDrag;
    Point dragPoint;

    protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
    {
        dragPoint = e.GetPosition(this);
        inDrag = true;
    }

    protected override void OnMouseMove(MouseEventArgs e)
    {
        if (inDrag)
        {
            Point pointMoveTo;

            // Find the current mouse position in screen coordinates.
            pointMoveTo = this.PointToScreen(e.GetPosition(this));

            // Compensate for the position the control was clicked.
            pointMoveTo.Offset(-dragPoint.X, -dragPoint.Y);

            // Compensate for the non-client region (title bar).
            // This code is not necessary if you explicitly hide the title bar
            //  by setting the form's BorderStyle to None.
            //pointMoveTo.Offset(0, -25);

            // Move the window.
            this.Left = pointMoveTo.X;
            this.Top = pointMoveTo.Y;
        }
        base.OnMouseMove(e);
    }

    protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
    {
        inDrag = false;

        MessageBox.Show("this is a test");
        base.OnMouseLeftButtonUp(e);
    }
}

任何帮助表示赞赏。



提前谢谢。

Any help is appreciated.

Thanks in advance.

推荐答案

public partial class myWindow : Window
{
    public myWindow()
    {
        this.InitializeComponent();
    }

    bool inDrag = false;
    Point anchorPoint;

    protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
    {
        anchorPoint = PointToScreen(e.GetPosition(this));
        inDrag = true;
        CaptureMouse();
        e.Handled = true;
    }

    protected override void OnMouseMove(MouseEventArgs e)
    {
        if (inDrag)
        {
            Point currentPoint = PointToScreen(e.GetPosition(this));
            this.Left = this.Left + currentPoint.X - anchorPoint.X;
            this.Top = this.Top + currentPoint.Y - anchorPoint.Y;
            anchorPoint = currentPoint;
        }
    }

    protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
    {
        if (inDrag)
        {
            ReleaseMouseCapture();
            inDrag = false;
            e.Handled = true;
        }
    }
}

private bool inDrag = false;
private Point anchorPoint;

private bool iscaptured = false;

protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
	anchorPoint = PointToScreen(e.GetPosition(this));
	inDrag = true;
}

protected override void OnMouseMove(MouseEventArgs e)
{
	if (inDrag) {
		if (!iscaptured) {
			CaptureMouse();
			iscaptured = true;
		}
		Point currentPoint = PointToScreen(e.GetPosition(this));
		this.Left = this.Left + currentPoint.X - anchorPoint.X;
		this.Top = this.Top + currentPoint.Y - anchorPoint.Y;
		anchorPoint = currentPoint;
	}
}

protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
{
	if (inDrag) {
		inDrag = false;
		iscaptured = false;
		ReleaseMouseCapture();
	}
}

private Point startPoint;
private void Window_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    startPoint = e.GetPosition(this);
}

private void Window_PreviewMouseMove(object sender, MouseEventArgs e)
{
    Point newPoint = e.GetPosition(this);
    if (e.LeftButton == MouseButtonState.Pressed && (Math.Abs(newPoint.X - startPoint.X) > SystemParameters.MinimumHorizontalDragDistance ||
        Math.Abs(newPoint.Y - startPoint.Y) > SystemParameters.MinimumVerticalDragDistance))
    {
        this.DragMove();
    }
}

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