Button Down fcn for Listbox

Question

Max Müller 2014-8-13

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https://ww2.mathworks.cn/matlabcentral/answers/147413-button-down-fcn-for-listbox

评论： Max Müller 2014-8-14

Hey Guys,

I want to enable the buttondownfcn for my Listbox.Due to the fact that this code works only for the RightMouseButton, i guess the LeftMouseButton has already another fcn.

The Question: Is there a way to "delete" the listbox Callback,so i can use my Callback for every MouseButton ?

function ArithmeticalMeanButton_Callback(hObject, eventdata, handles)
       Data = findobj('tag','PlotedShotsListbox');
              set(Data,'buttondownfcn',@ClickToChose);
      function ClickToChose(gcbo,evendata,handles);
               ListboxContent = get(gcbo,'String');
               ListboxLine = get(gcbo,'Value');
               ChosenLine = ListboxContent(ListboxLine);

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Answer 1

Yu Jiang 2014-8-13

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https://ww2.mathworks.cn/matlabcentral/answers/147413-button-down-fcn-for-listbox#answer_148464

编辑：Yu Jiang 2014-8-13

Hi Max

In MATLAB GUI, a left mouse click triggers the execution of the listbox's Callback function and a right mouse click triggers ButtonDownFcn.

Therefore, if you would like to execute the same callback function from either the left or the right mouse button click, you may need to assign your function ClickToChose to both the 'ButtonDownFcn' and the 'calllback'.

That is to say, in the function ArithmeticalMeanButton_Callback, you may need to add the following line

set(Data,'callback',@ClickToChose);

More details of the ListBox component can be found here

http://www.mathworks.com/help/matlab/creating_guis/add-code-for-components-in-callbacks.html#f10-1001494

A good example showing how to use ListBox can be seen via the following link

http://www.mathworks.com/help/matlab/creating_guis/interactive-list-box-in-a-guide-gui.html

In addition, I have noiced that you use findobj to get the handle of 'PlotedShotsListBox'. Have you considered directly obtain that from handles structure? For example, you may change the line

Data = findobj('tag','PlotedShotsListbox');

to

Data = handles.PlotedShotsListbox;

This might be able to improve the efficiency of your code.

-Yu