App designer key press function

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Benedict Low 2020-11-4

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https://ww2.mathworks.cn/matlabcentral/answers/636515-app-designer-key-press-function

编辑： Benedict Low 2020-11-9

Hi,

I am using App Designer, and I would like to use the key press function, such that pressing the left arrow and right arrow on the keyboard, performs the same functions as clicking the buttons "previous" and "next" respectively. My code, which doesn't work, is as follows:

function UIFigureKeyPress(app, event)
            key = event.Key;
            switch key
                case 'rightarrow'
                    NextframeButtonPushed(app, event);
                case 'leftarrow'
                    PreviousframeButtonPushed(app, event);
            end
end

Was wondering if anybody knows where the problem lies. Thanks in advance for your time.

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Ramya Dodla 2020-11-4

Here is the link to a similar post on App designer Key press function. Hope this helps.

https://www.mathworks.com/matlabcentral/answers/514143-is-it-possible-to-assign-keyboard-shortcuts-to-trigger-certain-parts-of-my-app-in-app-designer-and

Benedict Low 2020-11-9

编辑：Benedict Low 2020-11-9

在 MATLAB Online 中打开

Thank you Ramya for responding.

I realised that the code didn't work because of the focus. The key press function only worked when the figure had focus, but not the children. Which means I had to always ensure that the focus was not on any child object, before pressing the keys.

A better solution was therefore the window key press function, because the code executes as long as the figure or any child object has focus.

function UIFigureWindowKeyPress(app, event)
            key = event.Key;
            switch key
                case 'rightarrow'
                    NextframeButtonPushed(app, event);
                case 'leftarrow'
                    PreviousframeButtonPushed(app, event);
            end
end