Re: ImageListener: Adding imageFocused/Activated event would be nice

Posted by Michael Schmid on Jul 01, 2010; 7:08pm
URL: http://imagej.273.s1.nabble.com/ImageListener-Adding-imageFocused-Activated-event-would-be-nice-tp3687738p3687742.html

Hi Wolfgang,

maybe I don't understand the problem correctly, but what about this:
When the plugin is opened, get the list of open windows from the  
WindowManager and register as a java.awt.event.WindowFocusListener  
for each of them.
Then use the ImageJ WindowListener interface to get WindowOpened/
closed events; register as WindowFocusListener for images that will  
be opened, and deregister on windows that will be closed.

Michael
________________________________________________________________

On 1 Jul 2010, at 17:44, Wolfgang Gross wrote:

> Thanks to Michael Ellis and Johannes Schindelin for their rapid  
> replies.
>
> As a summary:
> As Johannes has pointed out, listening to all AWT events might have  
> a rather
> heavy performance footprint. But then, most PCs today stay in in  
> idle mode for
> more than 99%.
> Adding a special windowslistener on opening new images still leaves  
> the task of
> handling all images already open when the plugin gets invoked.
>
> Adding a ImageFocused event to the ImageListener interface as  
> supposed in the
> OP gives problems with backward compatibility, ok, but lets get  
> "kicking and
> screaming into the century of the fruitbat" (copyright with Terry  
> Pratchett).
>
> Thanks again
> Wolfgang