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User control of picturebox location

Posted on 2009-05-05
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Last Modified: 2013-12-17
What is the best way to enable the user changing the location of picturebox or buttons on a form?
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Question by:yaron89
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5 Comments
 
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Expert Comment

by:wht1986
Comment Utility
do you mean changing the location of the image in a picture box, e.g. specifying the image displayed is c:\temp\pic1.gif? or do you mean, the picture box should now be at a new location, e.g. 200 pixels from the top and 300 pixels from the left on the form?
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Author Comment

by:yaron89
Comment Utility
I mean dragging it to a new location on the form.
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LVL 12

Expert Comment

by:wht1986
Comment Utility
You can use the mouse up/down.move events like below
private bool isDragging = false;

        private int currentX, currentY;
 

        private void Form1_Load(object sender, EventArgs e)

        {

            // load from some config file if needed for last set position

        }

        

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)

        {

            isDragging = true;

            currentX = e.X;

            currentY = e.Y;

        }
 

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)

        {

            if (isDragging)

            {

                this.pictureBox1.Top = this.pictureBox1.Top + (e.Y - currentY);

                this.pictureBox1.Left = this.pictureBox1.Left + (e.X - currentX);

            }

        }
 

        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)

        {

            isDragging = false;

            // save the current values to some config file if needed

        }

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Accepted Solution

by:
wht1986 earned 500 total points
Comment Utility
to make it easy to support multiple picture boxes, i would suggest creating your own class like below. then you can as many on the form as you need
public class MyDraggablePictureBox : PictureBox

{

    private bool isDragging = false;

    private int currentX, currentY;
 

    protected override void OnMouseDown(MouseEventArgs e)

    {

        isDragging = true;

        currentX = e.X;

        currentY = e.Y;

        base.OnMouseDown(e);

    }
 

    protected override void OnMouseMove(MouseEventArgs e)

    {

        if (isDragging)

        {

            this.Top = this.Top + (e.Y - currentY);

            this.Left = this.Left + (e.X - currentX);

        }

        base.OnMouseMove(e);

    }
 

    protected override void OnMouseUp(MouseEventArgs e)

    {

        isDragging = false;

        base.OnMouseUp(e);

    }

}

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Author Closing Comment

by:yaron89
Comment Utility
Thank You
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