Mouse Click callback on an image - temporarily disable

Hello, I have a GUI (created by guide) where everytime I load an image and display in an axes component I assign a button down function (called ImageClickCallback) so everytime I click on the image my function ImageClickallback executes. This all works fine.

axes(handles.axes1) 
imageHandle=imshow(img,[low,high]);                     % Display Image
set(imageHandle,'ButtonDownFcn',@ImageClickCallback);   % Assign callback to ButtonDown event

I am wanting to now use a mouse click on the image to draw lines (I know how to do this) but everytime I click the image the original ImageClickCallback executes. So my question is can I pause the original ButtonDownFcn callback ?

Thanks

Answer 1

[Geoff Hayes]

Jason - why not just remove the original callback just prior to wanting to draw the lines

set(imageHandle,'ButtonDownFcn',[]);  

You could then restore it later when needed.

[Jason]

Perfect, thats exactly what I wanted.

Thanks Geoff

[Jason]

Just noticed that imageHandle isn't global :

Undefined function or variable 'imageHandle'.

Error in Bin123>pushbutton199_Callback (line 15389)
 set(imageHandle,'ButtonDownFcn ',[]);   %temporarily turn off current ButtonDown event

[Geoff Hayes]

Try saving it to your handles structure so that it is available in all callbacks.

[Jason]

hmmm, I tried this, but still doesn't allow access to imageHandle in other functions

guidata(imageHandle, handles);

[Jason]

OK, have tried this:

In the function that I define image Handle

imageHandle=imshow(A,[lo hi]);
handles.imH=imageHandle; 
guidata(hObject, handles);

Then in the 2nd function where I want to disable the ButtonDownFcn

 imageHandle=handles.imH; 
 set(imageHandle,'ButtonDownFcn ',[]);   %temporarily turn off current ButtonDown event

But I get the following error message

Error using matlab.graphics.primitive.Image/set
The property name 'ButtonDownFcn ' is not a valid MATLAB identifier.

Error in ArchimedesIQC>pushbutton199_Callback (line 15392)
 set(imageHandle,'ButtonDownFcn ',[]);   %temporarily turn off current ButtonDown event

[Geoff Hayes]

The problem might be because of the trailing space character in the string

'ButtonDownFcn '

Try replacing with

set(handles.imH,'ButtonDownFcn',[]); 

[Jason]

Yes thts it....thanks for spotting the error

Jason