CODEWITHSUNDEEP
c#.netvisual-studio-2008windows-forms-designer
user593806
user593806

Reputation:

Click event for .Net (Windows Forms) user control

This is probably a very simple question, but for some reason, even the right way to web search for the answer eludes me...

I'm trying to create a user control that consists of a few labels and progress bars. However, I want the entire control to have a "Click" event that is raised no matter what item inside the control is clicked on. I've created a "HandleClick" procedure that is assigned to each control:

    private void HandleClick(object sender, EventArgs e)
    {
        // Call the callback function, if we were asked to
        if (OnClick != null)
        {
            EventArgs ee = new EventArgs();
            OnClick(this, ee);
        }
        else
        {
            MessageBox.Show("OnClick was null!");
        }
    }

OnClick in this instance is a variable defined at control level:

    public new event EventHandler OnClick;

Now, this only works properly on the form. On one label it shows the MessageBox, and then calls the event on the enclosing form. All the rest show the message box.

I get the feeling that this should be obvious, but an afternoon of frustration has left me feeling I'm missing something that should be self-evident, but when I see it I am going to feel like a complete buffoon... can anyone stop giggling at my daftness long enough to enlighten me where I've gone wrong?

Upvotes: 5

Views: 8080

Answers (2)

user593806
user593806

Reputation:

Sorry about this - just putting an answer on in case someone googles it...

In case you're interested, this post helped solve it: User Control Click - Windows Forms… Basically, remove HandleClick, and the property and substitute this one instead:

public new event EventHandler Click
{
    add
    {
        base.Click += value;
        foreach (Control control in Controls)
        {
            control.Click += value;
        }
    }
    remove
    {
        base.Click -= value;
        foreach (Control control in Controls)
        { 
            control.Click -= value;
        }
    }
}

Upvotes: 10

Jim Mischel
Jim Mischel

Reputation: 133950

I've never tried this with Windows Forms, but in other GUIs I've placed a transparent panel that covers the entire form so that when you click "on the form," the event actually goes to the panel control.

Upvotes: -1

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