How we move a label in windows forms when mouse click on it and when mouse key up then stop moving inside a group box

Question

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I'm Trying with this example but it's not working

C#

public frmChequeFormat()
    {
        InitializeComponent();
        gbCheque.MouseMove += gbCheque_MouseMove;
    }
    bool mDown = false;
    private void gbCheque_MouseMove(object sender, MouseEventArgs e)
    {
        if (mDown)
        {
            label13.Location = e.Location;
        }
    }
    private void label13_MouseDown(object sender, MouseEventArgs e)
    {
        mDown = true;
    }
    private void label13_MouseUp(object sender, MouseEventArgs e)
    {
        mDown = false;
    }

Posted 28-Jul-15 23:36pm

Zohaib Hassan DxB

Updated 28-Jul-15 23:37pm

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Comments

lukeer 29-Jul-15 5:48am

label13_MouseDown() doesn't subscribe to the MouseDown event. Therefore, it won't get called.

Zohaib Hassan DxB 29-Jul-15 7:12am

Can you me your send code what ever you are saying. Because I try to best but still problem is there

lukeer 29-Jul-15 7:30am

I have no code. It's your project. You have the code.
See my answer.

Zohaib Hassan DxB 29-Jul-15 7:41am

yes i share my code you can check in Question. but problem is that when label move there appear two label instead of one

3 solutions

Solution 2

You need MouseDown, MouseUp and MouseMove. All of them within the GroupBox. So you need to add this to your form constructor:

C#

public frmChequeFormat()
{
    label13.MouseDown += label13_MouseDown;
    label13.MouseUp += label13_MouseUp;
    label13.MouseMove += label13_MouseMove;  // You already have this one.
}

Then rename your gbCheque_* methods accordingly so they get called.

[Edit]
Renamed event and method names above from gbCheque* to label13*

The label shields your groupbox from getting those events. They are routed to the label instead. Hence the renaming in contrast to my first attempt.

Events should still be routed to the label, but now call handlers from there. At least until user moves the mouse very quickly to the upper left so it leaves the label and therefore causes label events to stop firing.
[/Edit]

Posted 29-Jul-15 1:30am

lukeer

Updated 29-Jul-15 2:43am

v2

Comments

Zohaib Hassan DxB 29-Jul-15 8:16am

not working :( before this label move but not with mouse, after this code label stuck and don't move

lukeer 29-Jul-15 8:43am

I updated my answer. What do you mean by "move but not with mouse"?

Solution 3

Man, if only someone wrote an article on doing just this.

Create your Own Runtime Movable Windows Forms Controls[^]

Posted 29-Jul-15 7:31am

Dave Kreskowiak

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Wendelius · Accepted Answer · 2015-07-28T23:52:00

Solution 1

Not sure why you handle the group box mouse move. Would it be resonable to handle the labels mouse move, for example

C#

private void label13_MouseDown(object sender, MouseEventArgs e) {
   mDown = true;
}

private void label13_MouseUp(object sender, MouseEventArgs e) {
   mDown = false;
}

private void label13_MouseMove(object sender, MouseEventArgs e) {
   if (mDown) {
      label1.Location = new Point(label1.Location.X + e.Location.X, label1.Location.Y + e.Location.Y);
   }
}

Posted 28-Jul-15 23:52pm

Wendelius

Updated 29-Jul-15 6:30am

v2

Comments

Zohaib Hassan DxB 29-Jul-15 6:46am

I try this code but when i move label, that time 2 label appear and move, not single label. Kindly try it on your system. Thanx

Wendelius 29-Jul-15 12:32pm

The flickering and seeing 2 labels happens because the position changes wrong if the new position is set directly from eventargs. The problem is that the position in eventargs is relative to the starting point. See the modified mousemove event handler in the answer.