How to disable or throw away mouse events

[Brian Richards]

In my app I have some actions that take some time. So when a user clicks on
a button to perform said action in the event handler I set the cursor to
waitcursor and disable the button. What I was trying to accomplish was
preventing the user from inputing multiple events. What happens is the
messages just get queued up and the event handler fires off again. Is there
anyway for me to ignore those events all together? I'd like to be able to do
it at the control level but application wide may be acceptable.

The other method I tried was overriding the preprocessmessage function to
throw away all events if the forms busy flag is set like the following:

public override bool PreProcessMessage(ref System.Windows.Forms.Message msg)
{
if(!_busy)
{
return base.PreProcessMessage(ref msg);
}
else
{
//busy just return true
return true;
}
}

Any tips would be welcomed. Thanks.

-Brian

 

[Herfried K. Wagner [MVP]]

In my app I have some actions that take some time. So when a user clicks on
a button to perform said action in the event handler I set the cursor to
waitcursor and disable the button. What I was trying to accomplish was
preventing the user from inputing multiple events. What happens is the
messages just get queued up and the event handler fires off again. Is there
anyway for me to ignore those events all together? I'd like to be able to do
it at the control level but application wide may be acceptable.

Mhm... Can you show some code? In general, the button should not
receive input events after being disabled.

 

[Brian Richards]

If I click on the button twice it preforms the action twice:


private void button_Click(object sender, ClickEventArgs e)
{
_busy=true;
button.Enabled = false;
this.Cursor = System.Windows.Forms.Cursors.WaitCursor;
try
{
action();
}
catch (Exception ex)
{
//process exception
}
_busy=false;
button.Enabled = true;
this.Cursor = System.Windows.Forms.Cursors.Default;
}

 

[ClayB [Syncfusion]]

If you just return when you are busy, does this handle the problem.

private void button_Click(object sender, ClickEventArgs e)
{
if(_busy)
return;
//continue with your present code.


===============
Clay Burch, .NET MVP

Visit www.syncfusion.com for the coolest tools

If I click on the button twice it preforms the action twice:


private void button_Click(object sender, ClickEventArgs e)
{
_busy=true;
button.Enabled = false;
this.Cursor = System.Windows.Forms.Cursors.WaitCursor;
try
{
action();
}
catch (Exception ex)
{
//process exception
}
_busy=false;
button.Enabled = true;
this.Cursor = System.Windows.Forms.Cursors.Default;
}
clicks