Start Stop button group not working

Question

Daniel Turon 2022-8-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1778545-start-stop-button-group-not-working

编辑： Kevin Holly 2022-8-12

I am making a 3D cube viewer in matlab, and need a start stop button to automatically flip through the cube. I have the following code...

function PlayPauseButtonGroupSelectionChanged(app, event)
    mode = app.PlayPauseButtonGroup.SelectedObject;
    
    if mode == app.PlayButton
        app.playMode = true;
        disp('play')
        app.playNow
    end
    if mode == app.PauseButton
        app.playMode = false;
        disp('pause')
    end
    
    while app.playMode
            app.currentChannel = app.currentChannel+1;
            if app.currentChannel>app.Nv
                app.currentChannel = 1;
            end
            app.ChannelSlider.Value=app.currentChannel;
            app.refreshAxes;
            pause(0.4);
    
        if ~isvalid(app); break; end %Prevents an error caused by this loop trying to continue with a closed figure
    end
    
end

The issue I believe falls in a second instance of the buttons callback not being to be activated whilst it is still running. When I am flipping between the play/pause, it is not displaying 'play' or 'pause' as it should be. Is there a way to fix this? I have interruptible checked on.

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Answer 1

Kevin Holly 2022-8-12

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1778545-start-stop-button-group-not-working#answer_1025790

编辑：Kevin Holly 2022-8-12

在 MATLAB Online 中打开

The function works for me. pause and play are displayed in the command window. Please see testpauseplay app attached.

If you want a play/stop button for your slider, you could use a pushbutton and change it's text and icon after being clicked.

See video player app attached if that is something you would be interested in (snippet of code below).

if app.PlayButton.Text == "Play"
      app.PlayButton.Text = "Stop";
      app.PlayButton.Icon = "IconEnd.png";
      while hasFrame(app.vidObj)
          vidFrame = readFrame(app.vidObj);
          imshow(vidFrame,'Parent',app.UIAxes)
          pause(1/app.vidObj.FrameRate);
          if app.PlayButton.Text == "Play"
              disp('Loop stopped by user');
              break;
          end
      end
  else
      app.PlayButton.Text = "Play";
      app.PlayButton.Icon = "IconPlay.png";
  end