DraggingControlWithMouse & mouse pointer NOT to reset to the top left corner of control !

Question

0.00/5 (No votes)

See more:

I have this xxx_MouseMove method. In it I manage to make the functionality for dragging a button and with it a custom control for a keyboard with Russian characters.
Right NOW when I click on that button, my mouse pointer move to 0,0 location of that button, which is the top left corner.
I don't want this behavior. I want that wherever i click inside that button, when I move the mouse, its pointer remain where I click the first time, and not reset to the top left corner.
Any ideas?
Here is my code:
And as always, many thanks for your great help you give to us (the little ones).

 bool dragging = false;
  private void ButtonMoveKeyboard_MouseMove(object sender, MouseEventArgs e)
        {
            if (dragging)
            {
                Point MPosition = new Point();
                MPosition = this.PointToClient(MousePosition);

//Point buttonCentre = new Point(ButtonMoveKeyboard.Width, ButtonMoveKeyboard.Height);
//Point p = ButtonMoveKeyboard.PointToScreen(buttonCentre);
//Cursor.Position = p;.Position = p;

                ButtonMoveKeyboard.Location = new Point(MPosition.X, MPosition.Y - 10);
                ButtonMoveKeyboard.Refresh();
                russianKeyboard1.Location = new Point(ButtonMoveKeyboard.Location.X, MPosition.Y);
            }
        }

private void MoveBtnForRusKeyboard_MouseDown(object sender, MouseEventArgs e)
        {
            dragging = true;
            ButtonMoveKeyboard.BackColor = Color.LimeGreen;
        }
 private void MoveBtnForRusKeyboard_MouseUp(object sender, MouseEventArgs e)
        {
            if (dragging) dragging = false;
            ButtonMoveKeyboard.BackColor = Color.SandyBrown;
        }

Posted 24-Nov-11 5:29am

_Q12_

Updated 24-Nov-11 7:03am

v2

Add a Solution

Comments

LanFanNinja 24-Nov-11 12:31pm

Check my solution

_Q12_ 24-Nov-11 12:33pm

Im just looking on it...but is a custom class...and I hardly see what I need there... maybe some other link perhaps? -thx.

LanFanNinja 24-Nov-11 12:48pm

Just thought it might give you an idea of something you could do in your code.

2 solutions

Solution 1

I have had this problem before (a long time ago) right now I cannot remember how I fixed it so maybe this will help you figure it out
Move controls on a form at runtime[^]

Posted 24-Nov-11 6:27am

LanFanNinja

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

BillWoodruff · Accepted Answer · 2011-11-24T06:32:00

Your code is not working because you are confusing Form co-ordinate space with Button co-ordinate space.

You need to record the Point where the Mouse goes down on the Button: that Point will be in Button co-ordinate space: i.e., relative to the upper-left of the Button as 0,0. And, that Point is available in the MouseEventArgs instance passed into the Button MouseDown EventHandler, accessible through the variable name 'e.

When you move the Mouse, you need to calculate an offset between the Point where the Mouse is right now ... in the MouseMove EventHandler ... (once again available in the 'e variable), and the Point the Mouse first went down.

That offset, then, can be applied to re-locate the Button, and your current Mouse-Cursor position will be maintained.

Then that same offset can be used to relocate your RussianKeyboard control.

Try this:

C#

private bool dragging = false;

    // where the Mouse first goes down
    private int mX;
    private int mY;

    // for calculating the offset in the MouseMove EventHandler
    private int dX;
    private int dY;

    private void ButtonMoveKeyBoard_MouseDown(object sender, MouseEventArgs e)
    {
        dragging = true;

        mX = e.X;
        mY = e.Y;

        ButtonMoveKeyboard.BackColor = Color.LimeGreen;
    }

    private void ButtonMoveKeyBoard_MouseUp(object sender, MouseEventArgs e)
    {
        dragging = false;

        ButtonMoveKeyboard.BackColor = Color.SandyBrown;
    }

    private void ButtonMoveKeyBoard_MouseMove(object sender, MouseEventArgs e)
    {
        if (dragging)
        {
            dX = e.X - mX;
            dY = e.Y - mY;

            ButtonMoveKeyboard.Left += dX;
            ButtonMoveKeyboard.Top += dY;

            russianKeyboard1.Left += dX;
            russianKeyboard1.Top += dY;
        }
    }
}

In this example, I'm using variables dX, dY, to store the calculated offsets because: they are used twice.