I’m reviving an ImageJ Java plugin from 2020. It uses a KeyListener.
The new build does not get any keypresses. I’ve looked at the current
documentation, and can’t find a problem. The plugin is fairly large. I’ll try
to make a minimal version - but would be happy to share it on my ImageJ Update
Site (see below).
Remember - this plugin worked fine in 2020, but now fails.
Here is what I think is the relevant code:
// listen to keyboard - stop IJ from listening!
win = ipl.getWindow(); // delayed until we are SURE it's visible
IJ.log("win = "+win);
canvas = win.getCanvas();
IJ.log("canvas = "+canvas);
win.removeKeyListener(IJ.getInstance());
canvas.removeKeyListener(IJ.getInstance());
IJ.log("removed IJ Listeners");
win.addKeyListener(this);
canvas.addKeyListener(this);
ImagePlus.addImageListener(this);
IJ.log("added Listeners");
…
win.requestFocus();
IJ.log("sampling...”);
category = sampleAt(xList.get(currentSamplePoint),
yList.get(currentSamplePoint));
IJ.log("sampled”);
…
while(true)
{
synchronized(this)
{
IJ.log("waiting...");
wait(); // keyPressed wakes us
IJ.log("woken up!");
}
…
// key pressed!
// keyCode, keyChar, and modifiers are current
If(keyCode == KeyEvent.VK_SPACE) return -1; // DELETE does not
work
if(keyCode == KeyEvent.VK_ENTER) return -2; // no mas!
int category = keyCode - KeyEvent.VK_1; // 1-based keys;
0-based category
if(category < 0) continue; // try again!
if(category >= choices.length) continue; // try again!
return category; // good category!
}
...
@Override
public void keyPressed(KeyEvent e)
{
IJ.log("keyPressed");
keyCode = e.getKeyCode();
keyChar = e.getKeyChar();
modifiers = e.getModifiers();
IJ.log(" "+keyCode+" "+keyChar+" "+modifiers);
synchronized(this)
{
IJ.log("notifying");
notify();
IJ.log("notified");
}
}
And here is the IJ Log:
win = 16385_175994_R_IR_OCT_20120429-09_8C3F4720.bmp
canvas = ij.gui.ImageCanvas[canvas1,5,44,384x496]
removed IJ Listeners
added Listeners
sampling...
sampleAt(90.05, 63.05)
waiting...
It looks to me as if we “wait” and then never get a KeyPress event.
When I press keys, I seem to get the usual ImageJ responses (does this mean
that the IJ Listeners were NOT removed?
Update site: CreativeComputation
Plugin name: AVL_Area_Fraction
—
Kenneth Sloan
[email protected]
Vision is the art of seeing what is invisible to others.
--
ImageJ mailing list: http://imagej.nih.gov/ij/list.html
