MATLAB: Callback only works outside image on panel

axesborderbuttondownfcnclickimageMATLABmousepanel

I have a set of images which are displayed in axes which are in turn each displayed in a separate panel. I have setup a buttondownfcn for each panel, and I have set 'HitTest' to 'off' for the image and axes. I would like the program to do something when an image is clicked. However, I find that the buttondownfcn for the panel only works if I click outside the image near the panel title. How can I get the program to detect if an image has been clicked on? Is there any way to determine what is detecting my button clicks and divert the attention to the underlying panel? Thanks Chris

Best Answer

You will need to set the image's Button Down Function, in the same way as for the panel.

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This happens, because the mouse click event is caught be the object in the foreground, the image. It steals the event and does not let it down to the axes in the background.

You tried to make the image transparent for events by setting hittest to 'off'. This is the right way, actually. But the 'NextPlot' property of the axes has the default value 'replace'. Then high-level functions like image reset the axes' properties to the defaults, such that the ButtonDownFcn is cleared.

So either set 'NextPlot' to 'add' (equivalent to: hold on). Or set the ButtonDownFcn again after image. Alternatively you can use the ButtonDownFcn of the image:

Method 1:

% in t1_OpeningFcn()
...
set(handles.axes1, 'NextPlot', 'add');
...
% in click():
% Now you have to remove former images manually:
delete(get(handles.axes1, 'Children'));
im = image(RGB, 'Parent', handles.axes1, 'HitTest', 'off');

Method 2:

% in click()

im = image(RGB, 'Parent', handles.axes1, 'HitTest', 'off');
set(handles.axes1, 'ButtonDownFcn', @click);

Method 3:

% in click()
im = image(RGB, 'Parent', handles.axes1, 'ButtonDownFcn', @click);

Best Answer

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