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I could find no way to make the feature work, so I have pulled it
from the code. I have also inserted asserts to warn library users
who would attempt to use illegal characters in user defaults keys
in the future. In short, you want your user defaults keys to be
something identifier-like.
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The MASDictionaryTransformer class is used to save shortcuts to
user defaults (and load them back) using a simple dictionary. The
value stored in the user defaults looks like this:
$ defaults read com.shpakovski.mac.Demo
{
MASDemoShortcut = {
keyCode = 15;
modifierFlags = 1048576;
};
…
}
This storage format has got the distinct advantage of being compatible
with the format used by Shortcut Recorder. In order to use it, you
have to set proper binding options for MASShortcutBinder and the
recorder control (MASShortcutView).
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There can only be one Carbon event handler, so it doesn’t make sense
to create multiple instances of the shortcut monitor.
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This is a big change that was hard to split into smaller commits. There’s now
a new class to bind shortcuts to actions, a new class to bind user defaults’
keys to actions, and a new way to associate user defaults with the recorder
control (MASShortcutView). I have also updated the demo app to go with the
changes.
The new class to associate shortcuts with actions is called MASShortcutMonitor.
It wraps the Carbon hotkey magic and offers a simple interface to add a
shortcut along with a block that should be run when the shortcut is pressed.
It’s the lowest-level interface.
Since the usual requirement is to store the shortcuts into user defaults,
there’s also a higher-level interface offered by the MASShortcutBinder class.
That takes a defaults key and associates it with a block. When the shortcut
stored under the defaults key changes, the binder automatically switches to the
new shortcut. The class is a wrapper built atop of the previous one, the
MASShortcutMonitor – it simply adds, updates and removes shortcuts as the
user defaults change.
I have removed the special user defaults integration code from the recorder
control (MASShortcutView) and replaced it with a small Cocoa Bindings shim.
This means that in order to keep the recorder control in sync with the defaults
you just have to call the usual bind:toObject:withKeyPath:options: method,
like this:
[_shortcutView bind:MASShortcutBinding
toObject:[NSUserDefaultsController sharedUserDefaultsController]
withKeyPath[@"values.ExampleDefaultsKey"
options:@{NSValueTransformerNameBindingOption:NSKeyedUnarchiveFromDataTransformerName}];
That’s more verbose than the previous solution, but it’s much cleaner and can
be swept under a convenience call if needed. I might also add a dictionaryValue
property later that would make it possible to bind the value to user defaults
directly, without a transformer, and would enable backward compatibility with
Shortcut Recorder.
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