Mouse Button Press distinction between "Left Mouse Button" and "Double Click Button"

Question

Vinay JR 2023-2-14

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回答： Sai Teja G 2023-8-29

Mouse.PNG

I have a Figure on which I load an .png image. I need to distinguish between SelectionType: "Left click" and "Double click". Below is my program. As I run it, when ever a Double click is excecuted it displays a "Left click". How do I make the program identify a "Double click"?

figure(1)

im= imread('Mouse.PNG'); %loading the image

i=imshow(im);

set(i,'buttondownfcn',@mybttnfcn); %setting the callback function

function mybttnfcn(h,~)

haxes = get(h,'parent'); %axes properties

hfigure = get(haxes,'parent'); %figure properties

b = get(hfigure,'selectiontype'); %identifying Selectiontype

xy = get(gca,'CurrentPoint'); %getting current points

if strcmpi(b,'normal')

text(xy(1,1),xy(1,2),'Left click') %displaying Left-click

elseif strcmp(b,'extend')

text(xy(1,1),xy(1,2),' Middle button') %displaying Middle-click

elseif strcmpi(b,'alt')

text(xy(1,1),xy(1,2),'Right click') %displaying Right-click

elseif strcmpi(b,'open')

text(xy(1,1),xy(1,2),'Double-click') %displaying Double-click

else

text(xy(1,1),xy(1,2),'Retry')

end

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Answer 1

Sai Teja G 2023-8-29

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在 MATLAB Online 中打开

Hi Vinay,

I understand that you want to identify the type of click the user does in the AppDesigner.

Unfortunately, it is currently not possible to identify left or right clicks in AppDesigner. However, there are workarounds available to detect double clicks.

One approach is to use the 'WindowButtonDownFcn' function. You can refer to the following link for more details: WindowButtonDownFcn
Another option is to use the 'WaitForButtonPress' function. You can write code similar to the example below to detect a double click:

w=waitforbuttonpress;
if w==0 % checking for single click
    k=waitforbuttonpress;
    if k==0 % checking for double click
        disp("Hello World")
    end
end

For more detailed documentation on both methods, you can refer to this link:

Double Click Documentation

Hope it helps!

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Answer 2

Tushar 2023-2-20

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Hi,

1. You can add a delay to distinguish single click from a double click, as your double clicks were perceived as two times single click.

You can have a look at this answer, which solves the same issue which you are facing:

Distinguish between single and double clicks with a delay

2. But, if you even don't want to burn half-second each time, then you could add a click threshold, and take action on single or double type of clicks.

For this you can have a look here:

Distinguish between single and double clicks without a delay

Hope it helps!

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Vinay JR 2023-4-26

On an app made with APP Designer, I have a Button . Now i need to identify when a user do "left click", "right click" and "double click" on this button. How can I impelemnt this??

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