MATLAB: Problem with waitforbuttonpress : Figure window not active

activefigurekeypresswiatforbuttonpress

Hi,

When I use the waitforbuttonpress function even if the figure seems to be on the foreground and active if I press keys nothing happens, I have to press alt+tab twice to have it active again and be able to press keys. I use Matlab R2015a on windows8.

kp=waitforbuttonpress;

keypress=get(gcf,'currentcharacter');

Any idea ?

Best Answer

Just found the solution. These lines were included in a loop. Just before these lines I was saving the figure so it was not a problem of the figure not being active but just that there was a lag due to the saving step.

Related Solutions

MATLAB: In MATLAB R2017a, how to change the focus of the “WindowKeyPressFcn” figure callback function from the command window back to the figure when a key is pressed

This is a known issue, and a potential workaround for this issue in MATLAB R2017a is to create a null figure callback function for "WindowKeyPressFcn" or "KeyPressFcn".

% Example of figure retaining focus when keyboard button is pressed
function KeyPressTest()
    f = figure;
    f.WindowKeyPressFcn = {@testKeyPressFcn};
end
function testKeyPressFcn(source,~)
    disp('Focus Retained')
    source.WindowKeyPressFcn = {@testKeyPressFcnNull};
end
function testKeyPressFcnNull(~,~)
end

MATLAB: Key press in GUI

You can catch such keys in the WindowKeypressFcn. This will help you to identify the names of the pressed keys:

FigH = figure
set(FigH, 'WindowKeyPressFcn', @KeyPress)
function KeyPress(Source, EventData)
disp(EventData)

Another idea is to use the (still undocumented?) "CurrentKey" and "CurrentModifier" properties of the FIGURE.

Best Answer

Related Solutions

MATLAB: In MATLAB R2017a, how to change the focus of the “WindowKeyPressFcn” figure callback function from the command window back to the figure when a key is pressed

MATLAB: Key press in GUI

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