App UIFigure Visibility Bug

Question

Mehdi Ansarey 2023-10-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2038691-app-uifigure-visibility-bug

回答： Sreeram 2024-8-9，3:05

I have Multi-Windows Application written with GUIDE. Currently I Tried to Migrate to App Designer.

My Problem: I Design An App, That Its Visibility Turned Off In App Startup Callback.

In Some Place, I Change The Position of That Windows (In Other Program Module), But Before User Decide to Click A Menu to show That App.

Its Very Odd That, The Windows Appears As Soon As Position Changed. I Tried to Turn It Visiblity Back to Off Again After Position Change Line. But It Didnt Work. Also Functions Like drawnow not useful (At First I Thought It is An Incomplete rendering problem).

This Is Secondary Windows That Should Be Invisible (app2):

function startupFcn(app)

app.UIFigure.Visible= "off"

end

In Master App, I Define ap2 Public Variable:

function startupFcn(app)

app.ap2= app2

end

And This Is Position Change In Some Callback That Tend To Show app2:

function ChangePositionButtonPushed(app, event)

app.ap2.UIFigure.Position= [100, 100, 1000, 700];

app.ap2.UIFigure.Visible

end

As you see, The 2nd Line Echo "off" Value for ap2.UIFigure, While It is shown.

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Answer 1

Sreeram 2024-8-9，3:05

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2038691-app-uifigure-visibility-bug#answer_1496839

Hi Mehdi,

I understand that app2 becomes visible when its position is altered from the master app, even though its “Visible” property is set to “off”. I was able to reproduce the issue in MATLAB R2023b.

I have verified that this issue is not present in MATLAB R2024a. If you wish, you may upgrade to the latest MATLAB version.

You can work around the issue in MATLAB R2023b by toggling visibility to “on” and then back to “off” right after updating its position:

app.ap2.UIFigure.Visible = "on";

app.ap2.UIFigure.Visible = "off";

However, the UI figure might still be briefly displayed on the screen before getting hidden.

Hope this helps.