Can we use parameter in mouse click event C #
I am using a loop for a 2D array of buttons. I don't know how to know exactly which buttons in the array were pressed or not.
Here is my code:
for (int i = 0; i < 100 ; i++)
{
for (int j=0 ; j< 100; i++)
{
arrButton[i, j] = new Button();
arrButton[i,j].Size = new Size(size1button, size1button);
arrButton[i,j].Location = new Point(j*size1button, i*size1button);
arrButton.Click += new EventHandler(arrButton_Click);
}
}
Can I use i, j parameters for the mouse click event like:
private void arrButton_Click(object sender, EventArgs e, int i, int j)
{
//my idea : add i, j to another int[,] array to keep track of buttons which were clicked
}
If it comes out, how do I write it down correctly? Or can you recommend or a method to know exactly where the button was clicked in the array?
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You cannot change the EventHandler signature to include i
and j
.
However, you can get this information from what is already passed to the method arrButton_Click
. Since you are setting the location of each button as new Point(j*size1button, i*size1button)
, you can return each component i
and j
by dividing the location of your button by size1button
.
To get this location, you can use sender
which is yours Button
(listing needed):
private void arrButton_Click(object sender, EventArgs e)
{
Button btnClicked = (Button) sender;
int i = btnClicked.Location.Y / size1button;
int j = btnClicked.Location.X / size1button;
}
Also, the code you are using to create the buttons has a couple of bugs.
First, you never increase j
; the second cycle has i++
.
Second, if you want your buttons to appear, you must add them to your form Controls
.
Finally, I don't think you can have 10,000 active buttons on your form, try a lower number like 25.
So, the corrected code will look like this:
for (int i = 0; i < 5; i++)
{
for (int j = 0; j < 5; j++)
{
arrButton[i, j] = new Button();
arrButton[i, j].Size = new Size(size1button, size1button);
arrButton[i, j].Location = new Point(j*size1button, i*size1button);
arrButton[i, j].Click += arrButton_Click;
Controls.Add(arrButton[i,j]);
}
}
You may also notice that I removed your ad new EventHandler
that was redundant.
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If you are only interested in Location
what is wrong with that? -
private void arrButton_Click(object sender, EventArgs e)
{
var button = sender as Button;
//now use button.Location
}
But if you want more data other than space. Here's an example
Use your own button class -
public class CustomButton<T> : Button {
public T Data{get;set;}
public CustomButton(T data){
this.Data = data; //i didn't compile it, so data type might mismatch.
}
}
Then use this class of buttons -
for (int i = 0; i < 100 ; i++)
{
for (int j=0 ; j< 100; i++)
{
arrButton[i, j] = new CustomButton<T> (...some data);
arrButton[i,j].Size = new Size(size1button, size1button);
arrButton[i,j].Location = new Point(j*size1button, i*size1button);
arrButton.Click += new EventHandler(arrButton_Click);
}
}
In the Cast
before CustomButton
and voila event handler there is your location -
private void arrButton_Click(object sender, EventArgs e)
{
var cButton = sender as CustomButton<T>;
// cButton.Datais your point. Have fun
}
BTW, you cannot change the default signature of event handlers if you want you to implement your own event / delegate.
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try it
public class Indeces
{
public int IndexI { get; set; }
public int IndexJ { get; set; }
}
Now in the loop set the tag
for (int i = 0; i < 100 ; i++)
{
for (int j=0 ; j< 100; i++)
{
arrButton[i, j] = new Button();
arrButton[i,j].Size = new Size(size1button, size1button);
arrButton[i,j].Location = new Point(j*size1button, i*size1button);
arrButton.Click += new EventHandler(arrButton_Click);
arrButton.Tag = new Indeces {IndexI = i,IndexJ = j};
}
}
Get values from tag here like
private void arrButton_Click(object sender, EventArgs e)
{
var button = sender as Button;
var indeces = (Indeces) button.Tag;//get indeces here
var i = indeces.IndexI;
var j = indeces.IndexJ;
}
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