Hi Michael,
no sure whether it is intended, but this is what happens:
Closing an ImageWindow calls ImageWindow.windowClosing (line 619).
If there is an instance of ImageJ, this runs "Close"
(Commands.closeimage), which calls imp.close(), where imp is the
ImagePlus. This calls imp.flush(), which activates the 'imageClosed'
callback of an ImageListener.
If there is no instance of ImageJ, ImageWindow.windowClosing only runs
'dispose' (of the GUI elements associated with it), but not imp.flush.
In a mode without an ImageJ panel (using ImageJ as a library), it might
be intended that closing the image does not call 'flush', which would
also delete the ImageProcessor/ImageStack arrays.
Not calling the 'imageClosed' callback of an ImageListener might be a
side effect that no one thought about.
But this is only speculations; I have no real insight in how ImageJ
should work without the ImageJ panel.
Michael
________________________________________________________________
On 12.05.25 14:14, Michael Ellis wrote:
I am not sure if this is a bug or a feature, but it caused me some head
scratching.
An imageListener registered with ImagePlus.addImageListener() does NOT get
called when an ImagePlus is closed unless an instance of an ImageJ has been
created. This is not the behaviour for imageOpened() and ImageUpdate()
which do get called.
=== SSC ===
package biz.dsuk.testimagejimpclose;
import ij.ImageJ;
import ij.ImageListener;
import ij.ImagePlus;
import ij.process.ByteProcessor;
public class TestImageJImpClose {
public static void main(String[] args) {
ImagePlus.addImageListener(new ImageListener() {
@Override
public void imageOpened(ImagePlus ip) {
System.out.printf("Opened image%n");
}
@Override
public void imageClosed(ImagePlus ip) {
System.out.printf("Closed image%n");
}
@Override
public void imageUpdated(ImagePlus ip) {
System.out.printf("Updated image%n");
}
});
/**
* When an ImageJ instance is not created, our image listener is NOT
* called when the image is closed. Run this and close the "Image"
window
* by clicking on its close icon.
*/
//t imageJ = new ImageJ();
ByteProcessor bp = new ByteProcessor(256, 256);
ImagePlus imp = new ImagePlus("Image", bp);
imp.show();
}
}
--
ImageJ mailing list: http://imagej.nih.gov/ij/list.html
--
ImageJ mailing list: http://imagej.nih.gov/ij/list.html
