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Keyboardfilter Question

 

Keyboardfilter Question
daveofgv

2 Aug, 2009 - 04:37 AM
Post #1

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Joined: 6 Nov, 2008
Posts: 7
Hello everyone,

I have a quick question that I am sure will be answered very quickly........

I am using:
CODE

   private void checkBox5_CheckedChanged(object sender, EventArgs e)
        {
            KeyboardFilter filter = new KeyboardFilter(new Keys[] { Keys.LWin, Keys.RWin, Keys.Escape | Keys.Control });
        }


for a checkbox. It works great to disable control + escape, however, I can not seem to cancel the method when the user unchecks the checkbox.

Does anyone know how I can make the ctrl+esc work again when the user unchecks the box?

thanks

daveofgv

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SixOfEleven

RE: Keyboardfilter Question

2 Aug, 2009 - 05:47 AM
Post #2

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QUOTE(daveofgv @ 2 Aug, 2009 - 06:37 AM) *

Hello everyone,

I have a quick question that I am sure will be answered very quickly........

I am using:
CODE

   private void checkBox5_CheckedChanged(object sender, EventArgs e)
        {
            KeyboardFilter filter = new KeyboardFilter(new Keys[] { Keys.LWin, Keys.RWin, Keys.Escape | Keys.Control });
        }


for a checkbox. It works great to disable control + escape, however, I can not seem to cancel the method when the user unchecks the checkbox.

Does anyone know how I can make the ctrl+esc work again when the user unchecks the box?

thanks

daveofgv


You could try and use the Checked property of the check box to set the filter.

CODE

private void checkBox5_CheckedChanged(object sender, EventArgs e)
{
    KeyboardFilter filter;

    if (checkBox5.Checked)
        filter = new KeyboardFilter(new Keys[] { Keys.LWin, Keys.RWin, Keys.Escape | Keys.Control });
    else
        filter = new KeyboardFilter(new Keys[] { Keys.LWin, Keys.RWin });
}
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daveofgv

RE: Keyboardfilter Question

2 Aug, 2009 - 06:22 AM
Post #3

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Posts: 7
CODE

{
    KeyboardFilter filter;

    if (checkBox5.Checked)
        filter = new KeyboardFilter(new Keys[] { Keys.LWin, Keys.RWin, Keys.Escape | Keys.Control });
    else
        filter = new KeyboardFilter(new Keys[] { Keys.LWin, Keys.RWin });
}


This does the samething. When I check the box the keys control+escape are blocked, however, when I uncheck the box the keys are still disabled.

Should I being using something other then "checkBox1_CheckedChanged"?
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SixOfEleven

RE: Keyboardfilter Question

2 Aug, 2009 - 07:43 AM
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The event handler you have chosen is the right event handler. For example I had a check box and a label on my form and I had this code in the event handler for the CheckChanged event.

CODE

private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
    if (checkBox1.Checked)
        label1.Text = "Checked";
    else
        label1.Text = "Unchecked";
}


The text in the label switched between the two values as it should according to the state of the Checked property so the programming logic is right. So it looks like the problem with the keys still being blocked might be with the KeyboardFilter itself.

I did have one thought on what might be causing your problem. For your keyboard filter you might not want to create it inside the event handler. You might want to make it a class wide variable instead.

CODE

KeyboardFilter filter;

private void checkBox5_CheckedChanged(object sender, EventArgs e)
{
    if (checkBox5.Checked)
    {
        // Set the filter
    }
    else
    {
        // Reset the filter
    }
}


This post has been edited by SixOfEleven: 2 Aug, 2009 - 07:43 AM
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