CODEWITHSUNDEEP
c#winformsvisual-studio
Abhijeet
Abhijeet

Reputation: 13856

Handle Double Click Anywhere in the Form?

In my WinForm application I have drawn a rectangle (System.Drawing.Rectangle) on a form.

I need to handle double click anywhere on the form

I could attach MouseDoubleClick event handler to the form. It works only when double click was made outside the rectangular shape.

How do I achieve this?

EDIT:

I have drawn a rectangle which is center aligned and covers only 40% of the whole winform area. When user double clicks on the rectangle I need to expand rectangle size to occupy full screen. That's all!

EDIT 2:

My friends who have down voted, write a comment please so that I could improve, please!

Upvotes: 2

Views: 1380

Answers (2)

m.edmondson
m.edmondson

Reputation: 30862

Unfortunately Rectangle does not contain any fire any events (at all) as System.Drawing merely provides "grahpics" for a form.

There are options (such as provided by @drew_w) however such workarounds that require interaction with COM objects is usually indicate it's time to re-evaluate the requirements.

Upvotes: 0

drew_w
drew_w

Reputation: 10430

The best way I know to do what you are looking for is to use the "WndProc" method. This allows you to collect "messages" (events) from the message queue before they are sent to the form. You then have the option of either responding to those events or allowing them to continue through the normal message process. For more information, take a look at the MSDN page here.

A brief example of how you might use this:

protected override void WndProc(ref Message m)
{
    // http://msdn.microsoft.com/en-us/library/windows/desktop/hh454920(v=vs.85).aspx
    // 0x210 is WM_PARENTNOTIFY
    // 513 is WM_LBUTTONCLICK
    if (m.Msg == 0x210 && m.WParam.ToInt32() == 513) 
    {
        var x = (int)(m.LParam.ToInt32() & 0xFFFF);
        var y = (int)(m.LParam.ToInt32() >> 16);

        var childControl = this.GetChildAtPoint(new Point(x, y));
        if (childControl == cancelButton)
        {
            // ...
        }
    }
    base.WndProc(ref m);
}

Credit for this example goes to: this stack question.

Remember too, that "double click" is just two single clicks, so you are going to have to monitor and find the time between clicks yourself to decide what actually represents a double click.

Upvotes: 1

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