MATLAB: Does the execution of the callback function cause another figure to be opened instead of acting on the GUI in MATLAB

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I have written my own callback functions that should perform some action in my GUI. However, when the callback executes, it causes another figure to open.

Best Answer

This can occur if you are using GCF in your callback function. GCF is a convenience function that returns the handle of the root object's "CurrentFigure" property. This property can only hold a figure whose handle is visible, i.e. the HandleVisibility is "on" (or "callback" while a callback is executing). If the figure's "HandleVisibility" is "off", then its handle will not be stored in the root object's "CurrentFigure" property. In this case, GCF will return either another figure (whose "HandleVisibility" is "on") or a new figure (if there are no figures with the appropriate "HandleVisibility" value).

Instead of GCF, you should use either GCBF, or the handle of the figure from the "handles" structure. GCBF will return the handle of the figure that contains the current callback object, i.e. the last object interacted with. The "handles" structure should contain the handle for the figure automatically, unless its Tag was modified and can not be used as a fieldname.

For instructions on plotting into axes in your GUI, see the Related Solution listed below:

Related Solutions

MATLAB: How to prevent MATLAB from creating axes on the GUIs

To fix this problem, change the "HandleVisibility" property of your GUI figure to 'Off' or 'Callback'. Setting this property to 'Off' will keep any functions or commands from modifying the GUI. If you change this property to 'Callback', only callbacks of objects in the figure will be able to add plots.

To change this property in GUIDE (R12 and later) select Tools->Application Options. Then, change the Command Line Accessibility to 'Off'.

MATLAB: In MATLAB 6.0 (R12) why does the callback of an edit uicontrol not fire when I change text in the field and then go to a menu and select an item on that menu

This bug has been fixed for Release 14 (R14). For previous releases, please read below for any possible workarounds:

This is the expected behavior for MATLAB under Windows. On UNIX systems, clicking on the menubar of the figure window causes the edit text callback to execute. However, on Windows systems, if an editable text box has focus, clicking on the menu bar does not cause the editable text callback routine to execute. This allows you to select text in an editable text box, and then choose copy/cut/paste routines from the menubar without executing the callback.

This behavior is consistent with the respective platform conventions. Clicking on other components or the background of the GUI executes the callback.

This issue has been forwarded to our documentation team to be clarified in future documentation.

If you would like for your editable text box's callback to execute when you click on a UIMENU, then you can use the following as a workaround:

% In the callback to the UIMENU, begin with the following lines of code: 
figure(gcbf);   % Changes the focus to the figure so that the editable text box loses focus 
drawnow;      % Forces the editable text box to update and fires the callback immediately 
% Subsequently, you can now access the editable text box's string: 
% This example assumes that the handle to the text box is stored in "handles.edit" 
get(handles.edit, 'string')  % returns the new string.

Best Answer

Related Solutions

MATLAB: How to prevent MATLAB from creating axes on the GUIs

MATLAB: In MATLAB 6.0 (R12) why does the callback of an edit uicontrol not fire when I change text in the field and then go to a menu and select an item on that menu

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