How to move label position up,down,right and left using keyboard arrow keys

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Hi Friends,

I have a label control i want to move this label control across the form with keyboard arrow keys.
second question
I have 4 buttons in the forms to move the control. i have written the code for that but how to handle when the user click on a button and not released the click control should move in the direction.(Avoid multiple clicks to move the control)

My code as follows

C#

private void btntop_Click(object sender, EventArgs e)
     {
         label3.Location = new Point(label3.Location.X, label3.Location.Y - 1);
     }

     private void btndown_Click(object sender, EventArgs e)
     {
         label3.Location = new Point(label3.Location.X, label3.Location.Y +1);
     }

     private void btnright_Click(object sender, EventArgs e)
     {
         label3.Location = new Point(label3.Location.X+1, label3.Location.Y);
     }

     private void btnleft_Click(object sender, EventArgs e)
     {
         label3.Location = new Point(label3.Location.X - 1, label3.Location.Y);
     }

Posted 9-Nov-14 5:41am

jinesh sam

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Thomas Daniels · Accepted Answer · 2014-11-09T06:10:00

Add a handler for the KeyDown event:

C#

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
    switch (e.KeyCode)
    {
        case Keys.Up:
            label3.Location = new Point(label3.Location.X, label3.Location.Y - 1);
            break;
        case Keys.Down:
            label3.Location = new Point(label3.Location.X, label3.Location.Y + 1);
            break;
        case Keys.Right:
            label3.Location = new Point(label3.Location.X + 1, label3.Location.Y);
            break;
        case Keys.Left:
            label3.Location = new Point(label3.Location.X - 1, label3.Location.Y);
            break;
    }
}

If you also want to make this work if the focus is on a control of the form but not on the form itself, you'll need to set the KeyPreview property to true. You can either do that through the Windows Forms designer in Visual Studio, or by adding this to your constructor:

C#

this.KeyPreview = true;

BillWoodruff · Accepted Answer · 2014-11-09T07:56:00

Responding to Arrow keys with Label: this is tricky because a Label doesn't quite behave like other Controls: you can't tab to it, for example. I wrote a long "solution" for dealing with Arrow Keys last year, here: [^]. See if that helps out with moving the Arrow Keys; if it doesn't please feel free to leave feedback here, or ask further questions.

Moving the Label by Button(s):

In the following code the four buttons that move the Label are all wired-up to the same MouseDown and MouseUp EventHandlers. In the MouseDown EventHandler values that control the direction of the movement of the Label are assigned based on which Button was clicked. Then, a Timer is started that moves the Label in each 'Tick event.

C#

private const int LeftMove = -1, RightMove = 1, UpMove = -1, DownMove = 1;

// edit: added missing variable declaration
private Point currentLabelLocation;

private bool IsLabelMoving = false;

private int xOffset, yOffset;

private void btnMoveLabelMouseDown_Click(object sender, MouseEventArgs e)
{
    Button theButton = sender as Button;

    xOffset = 0;
    yOffset = 0;

    switch (theButton.Name)
    {
        case "btnMoveLabelLeft":
            xOffset = LeftMove;
            break;
        case "btnMoveLabelRight":
            xOffset = RightMove;
            break;
        case "btnMoveLabelUp":
            yOffset = UpMove;
            break;
        case "btnMoveLabelDown":
            yOffset = DownMove;
            break;
    }

    IsLabelMoving = true;

    MoveLabelTimer.Start();
}

private void btnMoveLabelMouseUp_Click(object sender, MouseEventArgs e)
{
    IsLabelMoving = false;
    MoveLabelTimer.Stop();
}

In the Timer, the current location of the Label is recorded, and then it is moved: then a test is done to see if the Label is still fully visible inside its containing Form, or ContainerControl; if the Label is not fully visible, then it's moved back to where it was before the move, and the Timer is stopped.

C#

private void MoveLabelTimer_Tick(object sender, EventArgs e)
{
    if (IsLabelMoving)
    {
        currentLabelLocation = lblMoving1.Location;
        
        lblMoving1.Left += xOffset;
        lblMoving1.Top += yOffset;

        if (! lblMoving1.Parent.ClientRectangle.Contains(lblMoving1.Bounds))
        {
            MoveLabelTimer.Stop();
            lblMoving1.Location = currentLabelLocation;
        }
    }
    else
    {
        MoveLabelTimer.Stop();
    }
}

How to move label position up,down,right and left using keyboard arrow keys

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