Updating Handles in WindowKeyPressFcn

I'm trying to make a panel visible when the user presses the 'a' key. However the handles structure is not updating like I want it to.

 function figure1_WindowKeyPressFcn(hObject , eventdata , handles)

 switch eventdata.Key

    case 'a'

       set(handles.mypanel,'visible','on');

    end

 guidata(hObject,handles);

Any ideas why this is not causing the panel to become visible? Or a workaround?

Thanks, Matt

[PIEASIAN ISB]

Hi, i am calling a callback function by using uimenu. Function name movx. In movx i define a windowkeypressfunc key1. I press desired key and perform the task upto this its ok. But how disable this windowkeypressfunc. I want disable this windowkeypressfunc and when i call it back it should be enabled. Kindly any suggestions help Thanks

Answer 1

[Walter Roberson]

Try adding a

drawnow()

after the set()

Do you want the panel to become visible on "a" or on "m" ? You coded "m"

Note: you do not need to guidata() in the case you show.

[Matt]

Sorry, it should be an 'a'. drawnow() did not work either. I use several set and get statements in callbacks and custom functions throughout the script. It is only in the WindowKeyPressFcn in which this became a problem. Any other suggestions? Thanks for your time.

[Walter Roberson]

Can you confirm that the function is being activated? Such as by putting

disp(eventdata)

just under the function header?

Answer 2

[Sean de Wolski]

• Stick a break point on the set() line. What does:

ishandle(handles.mypanel)

return?

• Are you sure the panel exists and that its stacking order is above another panel that it might be hiding behind?

doc uistack %for more info

Answer 3

[Jan]

I do not see the connection between the code and updating the handles struct. The handles struct is not modified at all in the code, therefore the guidata(hObject, handles) command is useless here. But there might be another problem, see FAQ: Incomplete handles struct in callbacks:

function figure1_WindowKeyPressFcn(hObject , eventdata , handles)
...
guidata(hObject,handles);

The handles struct from the input arguments is not the current version. If this causes your problems, use this:

function figure1_WindowKeyPressFcn(hObject , eventdata , handles)
handles = guidata(hObject);  % Current version!
handles.myData = rand(5);    % Any changes
guidata(hObject, handles);   % Store updated struct