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How to set shortcuts for zoom tool in my own GUI?

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Albert Bing
Albert Bing on 26 Jan 2020
Commented: Albert Bing on 28 Jan 2020
I wrote a GUI in which the zoom tool was frequently used, so I wanted to give it a shortcut. I wrote the figure's KeyPressFcn as follows, but it didn't work.
Q1. The "Ctrl+0" means zoom out, and it worked just fine. But "Ctrl+E" to zoom on just didn't work. How should I wrote the function `zoomKeys`?
Q2. I wanted to use "ctrl+=", but it was used by the editor to zip the codes. Can I still somehow use "Ctrl+="?
function myfunc1(fig)
fig.KeyPressFcn = @zoomKeys;
hAxes = axes(fig);
% some codes
plot(1:10);
function zoomKeys(~, event)
if strcmp(event.Modifier, 'control')
switch event.Key
case 'E' %'='
zoom;
% zoom(gcf, 'on');
case '0'
zoom out;
end
end
end
end
  2 Comments
Albert Bing
Albert Bing on 26 Jan 2020
Well, the question is the shortcut "ctrl+E" just doesn't work, no matter "zoom" or "zoom(2)".

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Accepted Answer

Mohammad Sami
Mohammad Sami on 26 Jan 2020
Edited: Mohammad Sami on 26 Jan 2020
Just tested your code. turns out event key is in lower case. Just to safe (in case of capslock), lets convert the value to upper case before comparison.
function zoomKeys(~, event)
if strcmp(event.Modifier, 'control')
k = upper(event.Key);
% disp(k); % for debugging
switch k
case 'E' %'='
zoom;
% zoom(gcf, 'on');
case '0'
zoom out;
end
end
end
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