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Chandough
Chandough

Reputation: 165

Callback functions in a loop in MATLAB GUI

This is a MATLAB GUI. And I have a while loop running. But while in the loop i need to use keyboard inputs which are a different callback. Is there a way or is it possible to execute that callback while it is in the loop?

Note: I am using GUIDE

Upvotes: 0

Views: 2105

Answers (1)

grantnz
grantnz

Reputation: 7423

Yes, this is possible. You just need to get the character data from the keypress callback to the callback that is in a loop. One way of doing this is via the figure guidata.

For example, if your loop is running from a button callback and you want to see a keypress on the figure you could use the following:

Button Callback

% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)

fig = get(hObject,'Parent');
for i=1:1000
    pause(0.01);
    % Get the latest guidata
    handles = guidata(fig);
    if isfield(handles,'KeyData' ) && ~isempty(handles.KeyData)
        fprintf(1,'Pressed : %s\n', handles.KeyData.Character);
        % Clear the keydata we have now handled.
        handles.KeyData = [];
        guidata(fig,handles);
    end
end

Figure keypress callback

% --- Executes on key press with focus on figure1 and none of its controls.
function figure1_KeyPressFcn(hObject, eventdata, handles)

% Store the keypress event data for use in the looping callback
handles.KeyData = eventdata;
guidata(hObject,handles);

Upvotes: 1

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