matlab - 在Matlab中的一段时间内只接受一个按键

Question

我有一个简单的 GUI 代码，如下所示。这个“test_keypress”函数创建一个图形，它响应按键（空格）。

现在，我想添加一个约束，以便 Matlab 在一段时间内（比如 1 秒）只接受一个按键。换句话说，如果在上一次按键发生后 1 秒内发生按键，我想拒绝它。

我怎样才能做到这一点？

function test_keypress

f = figure;
set(f,'KeyPressFcn',@figInput);
imshow(ones(200,200,3));

end


function figInput(src,evnt)

if strcmp(evnt.Key,'space')
    imshow(rand(200,200,3));
end

end

Answer 1

You can store the current time, and only evaluate the imshow command if the key-press occurs at least 100 seconds after the last one.

function test_keypress

f = figure;
set(f,'KeyPressFcn',@figInput);
imshow(ones(200,200,3));

%# initialize time to "now"
set(f,'userData',clock);

end


function figInput(src,evnt)

currentTime = clock;
%# get last time
lastTime = get(src,'UserData');

%# show new figure if the right key has been pressed and at least
%# 100 seconds have elapsed
if strcmp(evnt.Key,'space') && etime(lastTime,currentTime) > 100
    imshow(rand(200,200,3));
    %# also update time
    set(src,'UserData',currentTime)
end

end