Question

get control to which the focus is lost

Asked by: dkloeck

Hi experts,

How can I get the Control to which I loose the focus?

Thanks in advance,
DK

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Asked On
2007-08-20 at 09:52:34ID22774534
Tags

control

,

get

,

lost

Topics

C# Programming Language

,

Microsoft Visual C#.Net

Participating Experts
2
Points
500
Comments
5

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Answers

 

by: FernandoSotoPosted on 2007-08-20 at 10:15:23ID: 19731919

Hi dkloeck;

Connect all the Leave event handlers of the control to the event handler LostFocus as shown below. Then the last control to lose focus will be in the variable ControlLostFocus.

        private Object ControlLostFocus = null;

        private void LostFocus(object sender, EventArgs e)
        {
            ControlLostFocus = sender;
        }

Fernando

 

by: dkloeckPosted on 2007-08-21 at 02:11:58ID: 19736264

Yes, but I want to have the control I loose the focus to, not the one where I loose the focus.
For example..if I loose the focus of a textbox to a button, I want to get the button.

Also, I only would have access to the textbox events in that case, I can not put events in every control. Is that possible?

I make it because I have a calendarScreen I close when I loose the focus, but I have a Button that oopens it.
And I want that the calendarScreen closes if the button is pressed when the it is open, and the problem is that it first closes because the focus is lost..and then the button opens it again instead of closing it.

btw. thanks for the answer ^_^

 

by: NickGeorghiouPosted on 2007-08-21 at 05:07:00ID: 19737007

Hi,

A simple way to do this is to use a timer and a bool flag. Reset the flag on button click before closing\opening your calendar screen. Drop a timer on you form and then you can do something like the following:

private void CalenderControl_MouseLeave(object sender, EventArgs e)
{
    m_collapsingCalender = true;
    timer1.Start();
}

private void timer1_Tick(object sender, EventArgs e)
{
    timer1.Stop();
    if (m_collapsingCalender)
    {
        CalenderControl.Hide();
    }
}

private void button1_Click(object sender, EventArgs e)
{
    timer1.Stop();
    m_collapsingCalender = false;

    if (CalenderControl.Visible)
    {
        CalenderControl.Hide();
    }
    else
    {
        CalenderControl.Show();
    }
}

Hope this helps,
Nick

 

by: dkloeckPosted on 2007-08-21 at 08:49:44ID: 19738905

I thought about it too.. bet it seemed somehow strange to use a timer for it :)

but probably I will use that if there is no way to get the control I loose the focus to.

Thanks nick

 

by: NickGeorghiouPosted on 2007-08-21 at 15:37:02ID: 19742291

No problems.

But you shouldn't be concerned about using the timer. If you look at implementations of floating\hiding toolwindows such as in the Visual Studio IDE they don't hide themselves immediately when the you move the mouse away. There is a short pause to cater for if the user brings the mouse back onto the control, or to handle button clicks like in your situation. This makes a nicer application for the user. This function is normally done by timer.

Good luck.
Cheers,
Nick

20120131-EE-VQP-002

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