Comments on: Detecting window focus events

By: Malcolm Lidierth

Malcolm Lidierth — Fri, 20 May 2011 11:34:43 +0000

JText**** text edits are thread-safe: they are always run on the EDT by the Swing component’s own code. A drawnow() from MATLAB might help if the screen is not updating.

By: Yair Altman

Yair Altman — Mon, 11 Apr 2011 12:46:27 +0000

@Jamil – unfortunately, the current website design does not enable comment modification/deletion…

By: Jamil Onaran

Jamil Onaran — Mon, 11 Apr 2011 11:41:35 +0000

There should be a way to delete modify these comment, is there a way that I don’t know?

By: Jamil Onaran

Jamil Onaran — Mon, 11 Apr 2011 11:37:04 +0000

Hi Donn,
I got it, but I just demonstrated what createuimode.m does to disable the callback of axis component. After calling handle function for axisComponenent, we can not assign any callback to AxisCompnent. But your method works perfect and solved my problem. I’m using the following code to get the axisComponent.

mde = com.mathworks.mde.desk.MLDesktop.getInstance;
figName = get(hObject,'name');
if strcmpi(get(hObject,'number'),'on')
    figName = regexprep(['Figure ' num2str(hObject) ': ' figName],': $','');
end
jFig = []; iTry = 10;
while isempty(jFig) &amp;&amp; iTry
    jFig = mde.getClient(figName);
    iTry = iTry-1;
    pause(0.1);
end
axisComponent = jFig.getComponent(0).getComponent(0).getComponent(1);
axisComponent = handle(axisComponent, 'CallbackProperties');

This is an alternative method to get the axis component, but we can not obtain JavaFrame object from this code. I wish Matlab won’t stop supporting the javaframe.
Do you have other work arounds if they do so?

By: Donn Shull

Donn Shull — Wed, 06 Apr 2011 15:16:50 +0000

@Jamil – To summarize: To have callback properties the UDD peer must be created in the javahandle_withcallbacks package. In your code above you should use:

Frame  = get(hFig,'JavaFrame', 'CallbackProperties');

Then you will not generate errors. As Yair has explained hgload will create the UDD peer in the javahandle package which does not have callback properties. If you wish to use hgsave and hgload then you should design your code using handle.listener to process events. You need to take care to use the proper event names and provide persistent storage for your listener objects.

Donn

By: Jamil Onaran

Jamil Onaran — Wed, 06 Apr 2011 07:58:21 +0000

Hi again,
Actually this is not a visibility issue.
I have a test code below, using handles on AxisComponent will cause this error if we try to install a a callback.

%% Create a new figure
close all
hFig = figure;
%% Run this to generate an error
Frame  = get(hFig,'JavaFrame');
hFrame = handle(Frame);
hAxisComponent = handle(hFrame.getAxisComponent);
%% Get java frame and install a callback
Frame  = get(hFig,'JavaFrame');
AxisComponent = Frame.getAxisComponent;
set(AxisComponent,'MouseMovedCallback',@(a,b) disp('MMC'))

By: Jamil Onaran

Jamil Onaran — Wed, 06 Apr 2011 05:56:27 +0000

Thanks,
I figured it out.
toolbox\matlab\uitools\@uitools\@uimode\createuimode.m file cuases this problem, here is the corresponding code. The callbacks are usable until this line.

    hAxisComponent = handle(hFrame.getAxisComponent);

If you use get function for the axis component before this line or set the figure visible, the callbacks would be working. I don’t exactly know what handle is doing on invisible figures.

By: Donn Shull

Donn Shull — Wed, 06 Apr 2011 02:46:33 +0000

@Jamil – Note that when using handle.listener you need to use the event name which in your case is ‘MouseMoved’ rather than the callback property name which is ‘MouseMovedCallback’.

hgsave test
hgload test
 
jFig1 = get(handle(gcf), 'JavaFrame');
jAxis1 = jFig1.getAxisComponent;
l = handle.listener(handle(jAxis1),'MouseMoved',@(a,b) disp('ab'))

By: Yair Altman

Yair Altman — Tue, 05 Apr 2011 22:01:39 +0000

@Jamil - this may be the same issue as Kesh mentioned in comments above - please see my answer there. In short, Java callbacks don't work as advertised for hgloaded figures - only for figures created in runtime. This appears to be due to an internal Matlab bug, but I would not hold my breath for it to be fixed...Try using Donn's suggested workaround of using UDD's handle.listener function, which are explained in detail in this article.

By: Jamil Onaran

Jamil Onaran — Tue, 05 Apr 2011 20:13:59 +0000

Hi Donn
The below code did not work for the loaded figure, unlike the FocusGained callback. Is there another work around for this problem.

hgsave test
hgload test
 
jFig1 = get(handle(gcf), 'JavaFrame');
jAxis1 = jFig1.getAxisComponent;
l = handle.listener(handle(jAxis1),'MouseMovedCallback',@(a,b) disp('ab'))

Thanks