Number of push button change

Question

João 2019-1-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/440437-number-of-push-button-change

评论： Image Analyst 2019-1-20

I have an audio that I've split into 2 segments. I'd like to plot the audio file and add 2 push buttons in the figure, in order to play each segment. This part is quite standard to do. What if I decide to split the signal in 3 or 4, or more? How can I do that without creating all the possible push button? Is there any cleaver way of do it? Using a for loop uicontrol() would be a solutions.

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Answer 1

Image Analyst 2019-1-18

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/440437-number-of-push-button-change#answer_357054

编辑：Image Analyst 2019-1-18

在 MATLAB Online 中打开

Have an edit field or scrollbar/slider that allows the user to specify the number of segments to split it up into. Then have a single pushbutton that reads the number from the edit field and does its thing

numSegments = handles.sldNumSegments.Value; % For a scrollbar/slider in GUIDE
numSegments = str2double(handles.edtNumSegments.String); % For an edit text box in GUIDE

You could do the same thing to have the user say what segment to play, so they could specify to split it up into 9 segments and play segment #4 for example.

Attach your fig file and m file if you need any more help.

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João 2019-1-20

在 MATLAB Online 中打开

How do I get the value "val" from popupmenu into the callback of the push button?

selectSeg = uicontrol(gcf, 'Style'   , 'popupmenu', ...
                           'String'  , typeColorMap, ...
                           'Position', [10,200,83,20],...
                           'CallBack', @seg_index_Callback); 
                          
button = uicontrol('Parent', gcf,'Style','pushbutton',...
         'Units','normalized',...
         'Position',[0.4 0.3 0.2 0.1],...
         'String','Display Difference',...
         'Callback', @button_callback);
                      
                      
function seg_index_Callback(hObject, eventdata, handles)
    str = get(hObject, 'String');
    val = get(hObject,'Value');
end
function button_callback(hObject, eventdata, handles)
    popup_sel_index = get(hObject, 'Value')  
end

I've tried this but it did not work...

popup_sel_index = get(handles.popupmenu, 'Value');

Image Analyst 2019-1-20

在 MATLAB Online 中打开

Of course it didn't work. Because you're not using GUIDE. You created the popup on your own for some reason with uicontrol. So it's handle is not handles.popupmenu, but the name you gave it, which is selectSeg. So to get the value you need to refer to selectSeg.Value. If you want it in a separate variable for some reason, you could do

popup_sel_index = selectSeg.Value;

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Answer 2

Kevin Phung 2019-1-18

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/440437-number-of-push-button-change#answer_357053

Instead of having a pushbutton per segment, perhaps you can create a listbox that will be populated with the number of segments in your audio file.

Pushing the pushbutton will then play the selected segment.

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João 2019-1-19

在 MATLAB Online 中打开

How can I pass the popup_sel_index to the callback play?

selectSeg    = uicontrol(gcf, 'Style'   , 'popupmenu', ...
                              'String'  , typeColorMap, ...
                              'Position', [10,200,83,20],...
                              'CallBack', @seg_index_Callback); 
                          
playB    = uicontrol(gcf, 'Style'   , 'push', ...
                          'String'  , 'Play', ...
                          'Position', [10,225,83,20], ...
                          'CallBack', @play_Callback);
                      
seg_index_Callback(selectSeg)
play_Callback(playB)
                      
function seg_index_Callback(hObject, eventdata, handles)
    popup_sel_index = get(hObject, 'Value');
end
function play_Callback(hObject, eventdata, handles)
    soundsc(seg{1,popup_sel_index})
end

Image Analyst 2019-1-19

Would have been no problem with GUIDE where every callback function has access to ALL the controls and their values. But since you've accepted this answer, I guess you want to keep attempting to do it this way. I'm sure Kevin will answer shortly.

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