Refactored the shortcut dispatcher and bindings to user defaults.

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.

1 files changed, 82 insertions, 0 deletions

diff --git a/Framework/MASShortcutBinderTests.m b/Framework/MASShortcutBinderTests.m
new file mode 100644
index 0000000..f416304
--- /dev/null
+++ b/Framework/MASShortcutBinderTests.m
@@ -0,0 +1,82 @@
+#import "MASShortcutBinder.h"
+
+static NSString *const SampleDefaultsKey = @"sampleShortcut";
+
+@interface MASShortcutBinderTests : XCTestCase
+@property(strong) MASShortcutBinder *binder;
+@property(strong) MASShortcutMonitor *monitor;
+@property(strong) NSUserDefaults *defaults;
+@end
+
+@implementation MASShortcutBinderTests
+
+- (void) setUp
+{
+    [super setUp];
+
+    [self setBinder:[[MASShortcutBinder alloc] init]];
+    [self setMonitor:[[MASShortcutMonitor alloc] init]];
+    [_binder setShortcutMonitor:_monitor];
+
+    [self setDefaults:[[NSUserDefaults alloc] init]];
+    [_defaults removeObjectForKey:SampleDefaultsKey];
+}
+
+- (void) tearDown
+{
+    [self setMonitor:nil];
+    [self setDefaults:nil];
+    [self setBinder:nil];
+    [super tearDown];
+}
+
+- (void) testInitialValueReading
+{
+    MASShortcut *shortcut = [MASShortcut shortcutWithKeyCode:1 modifierFlags:1];
+    [_defaults setObject:[NSKeyedArchiver archivedDataWithRootObject:shortcut] forKey:SampleDefaultsKey];
+    [_binder bindShortcutWithDefaultsKey:SampleDefaultsKey toAction:^{}];
+    XCTAssertTrue([_monitor isShortcutRegistered:shortcut],
+        @"Pass the initial shortcut from defaults to shortcut monitor.");
+}
+
+- (void) testValueChangeReading
+{
+    MASShortcut *shortcut = [MASShortcut shortcutWithKeyCode:1 modifierFlags:1];
+    [_binder bindShortcutWithDefaultsKey:SampleDefaultsKey toAction:^{}];
+    [_defaults setObject:[NSKeyedArchiver archivedDataWithRootObject:shortcut] forKey:SampleDefaultsKey];
+    XCTAssertTrue([_monitor isShortcutRegistered:shortcut],
+        @"Pass the shortcut from defaults to shortcut monitor after defaults change.");
+}
+
+- (void) testValueClearing
+{
+    MASShortcut *shortcut = [MASShortcut shortcutWithKeyCode:1 modifierFlags:1];
+    [_binder bindShortcutWithDefaultsKey:SampleDefaultsKey toAction:^{}];
+    [_defaults setObject:[NSKeyedArchiver archivedDataWithRootObject:shortcut] forKey:SampleDefaultsKey];
+    [_defaults removeObjectForKey:SampleDefaultsKey];
+    XCTAssertFalse([_monitor isShortcutRegistered:shortcut],
+        @"Unregister shortcut from monitor after value is cleared from defaults.");
+}
+
+- (void) testBindingRemoval
+{
+    MASShortcut *shortcut = [MASShortcut shortcutWithKeyCode:1 modifierFlags:1];
+    [_binder bindShortcutWithDefaultsKey:SampleDefaultsKey toAction:^{}];
+    [_defaults setObject:[NSKeyedArchiver archivedDataWithRootObject:shortcut] forKey:SampleDefaultsKey];
+    [_binder breakBindingWithDefaultsKey:SampleDefaultsKey];
+    XCTAssertFalse([_monitor isShortcutRegistered:shortcut],
+        @"Unregister shortcut from monitor after binding was removed.");
+}
+
+- (void) testRebinding
+{
+    MASShortcut *shortcut = [MASShortcut shortcutWithKeyCode:1 modifierFlags:1];
+    [_defaults setObject:[NSKeyedArchiver archivedDataWithRootObject:shortcut] forKey:SampleDefaultsKey];
+    [_binder bindShortcutWithDefaultsKey:SampleDefaultsKey toAction:^{}];
+    [_binder breakBindingWithDefaultsKey:SampleDefaultsKey];
+    [_binder bindShortcutWithDefaultsKey:SampleDefaultsKey toAction:^{}];
+    XCTAssertTrue([_monitor isShortcutRegistered:shortcut],
+        @"Bind after unbinding.");
+}
+
+@end