PreviewMouseMove中的面板无法正常工作 [英] Panel in PreviewMouseMove not working properly

问题描述

您好专家，

我正在使用WPF和C#.在此，我正在使用图像上的面板数.并尝试使用e.LeftButton == MouseButtonState.Pressed在图像上移动面板.它可以正确移动，但是当一个面板在另一面板上覆盖时，PreviewMouseMove会保留较旧的面板，然后拾取新的面板.

使用此代码

Hello Experts,

I am working with WPF and C#. In this I am using number of panels on image. and trying to move panels over an image using e.LeftButton == MouseButtonState.Pressed.Its moving properly but when one panel override on another panel PreviewMouseMove leaves older one and pick up new one.

Using this code

void panel_PreviewMouseMove(object sender, MouseEventArgs e)
        {
            Point x = e.GetPosition(ImageHolder);
            StackPanel panel = (StackPanel)sender;
            if (e.LeftButton == MouseButtonState.Pressed)
            {
                //restrict dropped panel image to be in image area
                if ((Canvas.GetLeft(panel) + (x.X - p.X)) <= (Img.Width - panel.Width) && (Canvas.GetLeft(panel) + (x.X - p.X)) >= 0)
                {
                    Canvas.SetLeft(panel, Canvas.GetLeft(panel) + (x.X - p.X));
                }

                if ((Canvas.GetTop(panel) + (x.Y - p.Y)) <= (Img.Height - panel.Height) && (Canvas.GetTop(panel) + (x.Y - p.Y)) >= 0)
                {
                    Canvas.SetTop(panel, Canvas.GetTop(panel) + (x.Y - p.Y));
                }
            }

            p = x;
        }

向我建议一些修改或其他选择.

谢谢

Suggest me some modifications or else any alternative.

Thanks

推荐答案

我误解了OP正在使用WPF，因此该解决方案不适用于他/她. /> PreviewMouseMove无法正常工作 [

I misunderstood that the OP was using WPF so this solution did not work for him/her see the link below for the solution that did.
PreviewMouseMove is not working[^]

Use a boolean to check if you are already dragging a panel. i.e.

bool dragging = false;
void panel_PreviewMouseMove(object sender, MouseEventArgs e)
{
    if (e.LeftButton == MouseButtonState.Pressed && !dragging)
    {
        dragging = true;

        //your code
    }
    else if (e.LeftButton == MouseButtonState.Released)
    {
        dragging = false;
    }
}

像这样的东西应该可以正常工作.

something like this should work fine.

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