How can I create a checkbox in a new figure and control it from a GUI?

Question

Fabio 2016-10-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/307371-how-can-i-create-a-checkbox-in-a-new-figure-and-control-it-from-a-gui

回答： Venkat Ta 2019-7-27

Hi,

I have a GUI that, by pushing a button, creates a new figure with a set of checkboxes plus a control button. The problem is that I can create the figure with all I need,however I don't know how to control the value of the checkboxes via the control button I've created. As an example, let us assume to create a single checkbox and a control button in a new figure (by pushing a button in another GUI). When I press the just created control button, I would like to set the value of the checkbot to 1. However, when I try to create a callback function for the pushbutton I always get error (seems that the handles doesn't exist).

From a previous question on the furum https://www.mathworks.com/matlabcentral/answers/13351-dialog-with-checkboxes-in-gui I have got the code to create the figure with the checkboxes and the control button, but still I cannot make the control button to control the checkboxes. I report the code in the link above:

h.f = figure('units','pixels','position',[200,200,150,50],...
             'toolbar','none','menu','none');
% Create yes/no checkboxes
h.c(1) = uicontrol('style','checkbox','units','pixels',...
                'position',[10,30,50,15],'string','yes');
h.c(2) = uicontrol('style','checkbox','units','pixels',...
                'position',[90,30,50,15],'string','no');    
% Create OK pushbutton   
h.p = uicontrol('style','pushbutton','units','pixels',...
                'position',[40,5,70,20],'string','OK',...
                'callback',@p_call);
    % Pushbutton callback
    function p_call(varargin)
        vals = get(h.c,'Value');
        checked = find([vals{:}]);
        if isempty(checked)
            checked = 'none';
        end
        disp(checked)
    end

Basically, I cannot make the callback fucntion p_call to handle the "h.c2 checkboxes...

Any help?

Thanks a lot

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Answer 1

Walter Roberson 2016-10-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/307371-how-can-i-create-a-checkbox-in-a-new-figure-and-control-it-from-a-gui#answer_239090

在 MATLAB Online 中打开

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F

One way:

h.f = figure('units','pixels','position',[200,200,150,50],...
             'toolbar','none','menu','none');
% Create yes/no checkboxes
h.c(1) = uicontrol('style','checkbox','units','pixels',...
                'position',[10,30,50,15],'string','yes');
h.c(2) = uicontrol('style','checkbox','units','pixels',...
                'position',[90,30,50,15],'string','no');    
% Create OK pushbutton   
h.p = uicontrol('style','pushbutton','units','pixels',...
                'position',[40,5,70,20],'string','OK');
set(h.p, 'callback', @(src, event) p_call(src, event, h));

with

      % Pushbutton callback
      function p_call(src, event, h)
          vals = get(h.c,'Value');
          checked = find([vals{:}]);
          if isempty(checked)
              checked = 'none';
          end
          disp(checked)
      end

The h that will be passed to the callback will be a copy of the h as it existed at the time the callback was created. That is why I split it up into creation of a control and setting the callback -- in that way, h.p is populated before a copy of h is taken for the callback. If you combine them the way you had done, the h that would be passed in would be the version from before h.p had been assigned to.