PreviewMouseMove is not working

Question

5.00/5 (1 vote)

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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:

C#

void panel_PreviewMouseMove(object sender, MouseEventArgs e)
{
    Point x = e.GetPosition(ImageHolder);
    StackPanel panel = (StackPanel)sender;
    if (e.LeftButton == MouseButtonState.Pressed && !dragging)
    {
        dragging = true;
               
        //restrict dropped camera image to be in map 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));
        }
    }
    else if (e.LeftButton == MouseButtonState.Released)
    {
        dragging = false;             
    }

    p = x; 
}

Suggest me some modifications or else any alternative.

Thanks

Posted 24-Nov-11 19:33pm

KIDYA

Updated 24-Nov-11 20:18pm

LanFanNinja

v3

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Comments

LanFanNinja 25-Nov-11 2:20am

So I take it the my past solution did not work out? Sorry!
Is there any way you can post all of the code for your class so that I can run it and try to find a solution for you?

KIDYA 25-Nov-11 2:31am

Yes your past solution not worked..I tried many possibilities on it but not succeed.I am not able to post class over here.But I guess u got my problem? I want to just move panel over ImageHolder(not a drag and drop on it) and in above code I am setting imageHolder boundary for panel.

LanFanNinja 25-Nov-11 4:35am

Check my solution below. Hopefully this time it will work for you. Let me know.
And again I am sorry my mind has not been working so well lately :)

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LanFanNinja · Accepted Answer · 2011-11-24T22:30:00

C#

StackPanel panel;

void panel_PreviewMouseMove(object sender, MouseEventArgs e)
{
    Point x = e.GetPosition(ImageHolder);

    if (e.LeftButton == MouseButtonState.Pressed)
    {
        if (panel == null)
        {
            panel = (StackPanel)sender;
        }

        //restrict dropped camera image to be in map 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));
        }
    }
    else if (e.LeftButton == MouseButtonState.Released)
    {
        panel = null;
    }

    p = x;
}