CODEWITHSUNDEEP
c#winformsbutton
user2997877
user2997877

Reputation: 75

How to make a button move by touching an arrow key on the form?

I was wondering how to make a button move like up, down, right, or left, by touching an arrow key on my keyboard. I have tried:

button1.Location.X += 1;

But, I get an error saying how it's not a variable. So, I also tried:

public int xPos, yPos;

Then, down a bit under form1_keydown:

xPos = Convert.ToInt32(button1.Location.X);
yPos = Convert.ToInt32(button1.Location.Y);
if (e.KeyData == Keys.Up)
{
    xPos += 1;
}

But, it just doesn't work. Please help. Thanks!

Upvotes: 1

Views: 2885

Answers (3)

Pierre-Luc Pineault
Pierre-Luc Pineault

Reputation: 9191

You need to create a new location for your button, you cannot modify only X or Y because Point (The Location property type) is a struct.

You can do this, for example, on the KeyUp event of your form (Don't forget to actually wire the event, and not just copy/paste):

private void OnKeyUp(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Right)
    {
        button1.Location = new Point(button1.Location.X + 1, button1.Location.Y);
    }
}

Important note : If you go that way, do not forget to set KeyPreview = true; on your form, or the Key events will never fire.

Upvotes: 0

Reda
Reda

Reputation: 2289

You should do:

button1.Location = new Point(button1.Location.X + 1, button1.Location.Y);

Upvotes: 0

Adriano Repetti
Adriano Repetti

Reputation: 67080

I oversimplify a little bit to make it clear (and I skip all checks you have to do) but it may be something like this:

switch (e.KeyData)
{
    case Keys.Right:
        button1.Location = new Point(button1.Left + 1, button1.Top);
        break;
    case Keys.Left:
        button1.Location = new Point(button1.Left - 1, button1.Top);
        break;
    case Keys.Up:
        button1.Location = new Point(button1.Left, button1.Top - 1);
        break;
    case Keys.Down:
        button1.Location = new Point(button1.Left, button1.Top + 1);
        break;
}

Upvotes: 2

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