Comments on: Figure keypress modifiers

By: Eric

Eric — Mon, 25 Apr 2022 12:26:16 +0000

this save me a lot of time, thank you very much!

By: Heiko

Heiko — Thu, 01 Feb 2018 09:27:36 +0000

On a not directly related note, I found out that if you create a figure with an edit control and you enter the ‘@’ symbol, MatLab closes like it would with the CTRL+Q shortcut. If MatLab is configured to not ask for confirmation, it simply closes without warning.

Mathworks explains this with the CTRL+Q event forwarded from the figure to the command window. This behavior seems to exist since R2014b. MatLab doesn’t seem to make a distinction between the modifiers (‘@’ is CTRL+ALT+Q). The official workaround is to populate the file menu either by clicking on it, or programmatically like this:

f = figure;
filemenufcn(f, 'FilePost');
uicontrol(f,'Style','edit')

Alternatively, the confirmation for closing should be activated. Once cancelling the confirmation, the ‘@’ symbol can be used without the effect.

IMHO, this is a critical bug for GUIs using edit fields for email addresses and the like, because data loss is very likely.

By: Daniel Castano

Daniel Castano — Fri, 21 Apr 2017 07:42:54 +0000

This info has made may life so much easier in the past months…. thanks!

I’m wondering if the Figure class has some equivalent property for the behaviour of the mouse, i.e., a property that expresses if (in the moment of reading the property) the mouse is pressed, and which button.

By: Yair Altman

Yair Altman — Thu, 12 Nov 2015 22:34:06 +0000

When the window does not have focus then it should not handle any key-press event. It is the responsibility of the window that does have the focus to process it.

By: julien

julien — Thu, 12 Nov 2015 20:44:52 +0000

Actually, when figure has not the focus, java ‘KeyPressed’ event is not triggered. So, impossible to know when the clic is done which modifiers are pressed…

By: Yair Altman

Yair Altman — Tue, 10 Nov 2015 14:35:05 +0000

You can use the KeyPressedCallback property at the Java-frame level, then you don’t have any of these limitations.

By: julien

julien — Tue, 10 Nov 2015 13:33:48 +0000

Indeed, this is convenient. However, when figure has not focus, ‘CurrentModifier’ property is not updated. So if you hold a modifier key when figure has not focus and you then clic in the figure, ‘CurrentModifier’ property is not correct. Do you know a way to fix this?