Mouse Leave event on Windows Form

Question

I've set the 'mouse leave' event on a windows form and I want to hide the form when the mouse leaves the visible area.

But here is where I am facing a problem. Even when I move the mouse to a button on the same form, it calls the 'mouse leave' event, which makes this form invisible.

It means I've got to prevent the event triggering when moving the mouse to the button. But how? Any other approach?

The problem with mouse events on the form is that none of them will fire if you have any control covering the entire form client area (e.g. docked). So if you use the MouseMove event as MusiGenesis suggests, just be aware of that. — Igby Largeman, Oct 18 '11 at 17:39
There's no clean way to do this, you'll need a Timer. Hide the form when this.Bounds.Contains(Cursor.Position) is false. Getting the form to show again is going to be pretty difficult :) — Hans Passant, Oct 18 '11 at 17:41

Haris Hasan · Answer 1 · 2011-10-18T17:31:19.397

1

There is no simple way to do it. One way could be to check all the controls inside the Form and if mouse is not over any of them this means mouse is outside the Form

Another way could be to check inside mouse leave event whether mouse is inside the window boundary or not

edited Oct 18 '11 at 17:31

answered Oct 18 '11 at 17:25

Haris Hasan

29,856
10
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It will take too much effort. Isn't it? – Muhammad Ali Dildar Oct 18 '11 at 17:31
Yes, as I said there is no simple way to do it. The first option can be used if you have a small number of controls inside Form otherwise go for the second option – Haris Hasan Oct 18 '11 at 17:32
You can reach all controls and subcontrols via the Controls property (http://msdn.microsoft.com/en-us/library/system.windows.forms.control.controls.aspx). You could walk this control tree upon each MouseLeave if the Form is not too big/complex. – bitbonk Oct 18 '11 at 17:38
@HarisHasan below is a better solution, Hassan (remember me? :)) http://stackoverflow.com/questions/423728/winform-determine-if-mouse-has-left-user-control – PUG May 22 '12 at 18:12

score 0 · Answer 2 · edited Jun 21 '20 at 22:50

// On the form's MouseLeave event, please checking for mouse position is not in each control's client area.
private void TheForm_MouseLeave(object sender, EventArgs e)
{
    bool mouse_on_control = false;
    foreach (var c in Controls)
        mouse_on_control |= c.RectangleToScreen(c.ClientRectangle).Contains(Cursor.Position);
    if (!mouse_on_control)
        Close();
}

// And in addition, if any control inside has its client area overlapping the form's client area at any border, 
// please also checking if mouse position is outside the form's client area on the control's MouseLeave event.
private void ControlOverlappedTheFormsBorder_MouseLeave(object sender, EventArgs e)
{
    if (!RectangleToScreen(ClientRectangle).Contains(Cursor.Position))
        Close();
}

score 0 · Answer 3 · answered May 09 '16 at 15:42

0

it's very simple...add this:

protected override void OnMouseLeave(EventArgs e)
{

    if(this.ClientRectangle.Contains(this.PointToClient(Control.MousePosition)))
         return;
    else
    {
        base.OnMouseLeave(e);
    }
}

answered May 09 '16 at 15:42

Mirko Bastianini

31
6

Mouse Leave event on Windows Form

3 Answers3

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