double-click on "uilistbox" App designer

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joe 2019-7-11

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评论： Ahmet Gökhan POYRAZ 2021-3-19

Hallop everyone,

How can I execute a double-click on ListBox in App Designer?

Thank you in Advance

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回答（2 个）

Kevin Chng 2020-1-23

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编辑：Kevin Chng 2020-1-23

Up to R2019b, app designer don’t have this feature,

It is because if you click on the selected item, no event will be triggered. Therefore, we could say only single click is allowed under this limitaion.

You can use button to replace list box. [toggle button group will behave same as list box, so you could not use this], use the 'normal' button for this.

For example :

Step 1 : For example : 3 selection: Create 3 button

Step 2 : Create callback function for each of them (it is a bit tedious, I have 3 button, then I have 3 callback function)

Step 3: Create private function click

Step 4 : here you go:

(Single Click the button, it turns blue)

(Double Click the button, it turns red)

You might have further question about ‘how’and ‘where’ could you put your algorithm:

You could put your algorithm in the click function

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Chidvi Modala 2019-7-18

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In guide, To make the double-click work you only need to write the code below in List box callback

 function listbox_Callback(hObject, eventdata, handles) 
 if strcmp(get(gcf,'selectiontype'),'open')  
  % here you write write code, which you wanna be executed afer double-click
 end

In App designer, associate the below function with ValueChangedFcn callback of the List Box.

function clickcallback(obj,evt)
persistent chk
if isempty(chk)
      chk = 1;
      pause(0.5); %Add a delay to distinguish single click from a double click
      if chk == 1
          fprintf(1,'\nI am doing a single-click.\n\n');
          chk = [];
      end
else
      chk = [];
      fprintf(1,'\nI am doing a double-click.\n\n');
end

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Brett Mther 2020-9-26

This solution doesn't work for my application. If I double click on a ListBoxItem that is already selected, the ValueChangedFcn callback doesn't fire.