MATLAB: Callback for menu option to execute a function

callback

I need help understanding how to make a menu option call another function… The example below is the handle I've made for a menu item titled 'I am bored…' When the user clicks this, I want the function game.m to execute. Obviously the way I have it written below isn't working. Advice?

handles.help_menu_bored = ...
  uimenu(handles.help_menu,'label','I am bored...','Separator','on','Callback',{@help_menu_bored,handles});
function help_menu_bored_Callback(hObject, eventdata, handles)
fifteen

The error I get is the following:

??? Undefined function or method 'help_menu_bored' for input arguments of type 'struct'.
??? Error while evaluating uimenu Callback

Thanks!

Best Answer

@help_menu_bored_Callback not @help_menu_bored . MATLAB will not add the "_Callback", as nothing in MATLAB assumes any particular structure for callback names.

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MATLAB: Callback Function of uimenu

when uimenu (undo redo) callback goes to undo or redo functions, the parent of the hObject is uimenu and not the figure itself. The parent of uimenu is figure. which means if you want to call figure, you have to write

hObject.Parent.Parent

so when you call

entries=hObject.Parent.UserData;

for uimenu, the parent is uimenu and not the figure while for buttons of redo and undo the parent is figure itself

the best option is change

hObject.Parent

with

handle

in your code

MATLAB: How to switch YLim from auto to manual using contextmenu

Yes, of course. Callbacks are evaluated in the base workspace. If you use a variable, which is defined in a function, it is not known when the callback runs.

Better use function for callbacks and store variables in the figure by guidata.

uimenu(ylim_menu, 'Label', 'auto',   'Callback', {@uimenu_Callback, 'auto'});
uimenu(ylim_menu, 'Label', 'manual', 'Callback', {@uimenu_Callback, '01'});
...
function uimenu_Callback(uimenuH, EventData, Command)
handles = guidata(uimenuH);
switch Command
  case '01'
    set(handles.Fig3_axes, 'YLim', [0, 1]);
  case 'auto'
    set(handles.Fig3_axes, 'YLimMode', 'auto');
  otherwise
    error('Unknown command - programming error');
end

Now the contents of the variable Fig3yLim can by added as 4th input argument.

Defining callbacks as strings is supported for backward compatibility with Matlab 5.3 (1999). Using function handles is more secure and efficient.

Best Answer

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MATLAB: Callback Function of uimenu

MATLAB: How to switch YLim from auto to manual using contextmenu

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