How do I prevent two simultaneous key presses from tabbing away from my GUI?

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Shae Morgan
Shae Morgan 2015-12-1
编辑： Shae Morgan 2015-12-8
I have a gui that allows people to listen to a sentence and then type what they think the sentence said. The problem is, if someone is typing too fast and accidentally presses two keys at the same time, instead of putting both characters in the edit box, it tabs out and goes to the command line in MatLab. How do I prevent this from happening? I'm using the following code to pause while the person types their response until "enter" gets pressed: Any ideas would be helpful
currkey=0;
% do not move on until enter key is pressed
while currkey~=13 %13 is the ascii number for the return character
pause; % wait for a keypress
currChar=get(gcf,'CurrentCharacter');
currkey = double(currChar);
if isempty(currkey)
currkey=0;
else
end
end
Any ideas?

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采纳的回答

Walter Roberson
Walter Roberson 2015-12-1
Use a WindowKeyPressFcn callback in the figure instead.
  1 个评论
Shae Morgan
Shae Morgan 2015-12-8
编辑：Shae Morgan 2015-12-8
Tips on how to do this? I've never used WindowKeyPressFcn before...also, I am using GUIDE, so will that mess up my handles structure? I'm fairly new to MatLab so any help is appreciated!

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更多回答（1 个）

valdal
valdal 2015-12-1
编辑：valdal 2015-12-1
With KeyPressFcn and guidata :
h = uicontrol(...);
escape = false
guidata(h,escape)
set(h, 'KeyPressFcn', @key_pressed);
while ~escape
pause(0.01);
escape = guidata(h)
end
function key_pressed(h, e)
if strcmp(e.Key, 'return')
guidata(h, true)
end
end

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