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#import "chrome/browser/cocoa/nsmenuitem_additions.h"
#include <Carbon/Carbon.h>
#include "base/logging.h"
@implementation NSMenuItem(ChromeAdditions)
- (BOOL)cr_firesForKeyEvent:(NSEvent*)event {
DCHECK([event type] == NSKeyDown);
if (![self isEnabled])
return NO;
// In System Preferences->Keyboard->Keyboard Shortcuts, it is possible to add
// arbitrary keyboard shortcuts to applications. It is not documented how this
// works in detail, but |NSMenuItem| has a method |userKeyEquivalent| that
// sounds related.
// However, it looks like |userKeyEquivalent| is equal to |keyEquivalent| when
// a user shortcut is set in system preferences, i.e. Cocoa automatically
// sets/overwrites |keyEquivalent| as well. Hence, this method can ignore
// |userKeyEquivalent| and check |keyEquivalent| only.
// Menu item key equivalents are nearly all stored without modifiers. The
// exception is shift, which is included in the key and not in the modifiers
// for printable characters (but not for stuff like arrow keys etc).
NSString* eventString = [event charactersIgnoringModifiers];
NSUInteger eventModifiers =
[event modifierFlags] & NSDeviceIndependentModifierFlagsMask;
if ([eventString length] == 0 || [[self keyEquivalent] length] == 0)
return NO;
// Turns out esc never fires unless cmd or ctrl is down.
if ([event keyCode] == kVK_Escape &&
(eventModifiers & (NSControlKeyMask | NSCommandKeyMask)) == 0)
return NO;
// From the |NSMenuItem setKeyEquivalent:| documentation:
//
// If you want to specify the Backspace key as the key equivalent for a menu
// item, use a single character string with NSBackspaceCharacter (defined in
// NSText.h as 0x08) and for the Forward Delete key, use NSDeleteCharacter
// (defined in NSText.h as 0x7F). Note that these are not the same characters
// you get from an NSEvent key-down event when pressing those keys.
if ([[self keyEquivalent] characterAtIndex:0] == NSBackspaceCharacter
&& [eventString characterAtIndex:0] == NSDeleteCharacter) {
unichar chr = NSBackspaceCharacter;
eventString = [NSString stringWithCharacters:&chr length:1];
// Make sure "shift" is not removed from modifiers below.
eventModifiers |= NSFunctionKeyMask;
}
if ([[self keyEquivalent] characterAtIndex:0] == NSDeleteCharacter &&
[eventString characterAtIndex:0] == NSDeleteFunctionKey) {
unichar chr = NSDeleteCharacter;
eventString = [NSString stringWithCharacters:&chr length:1];
// Make sure "shift" is not removed from modifiers below.
eventModifiers |= NSFunctionKeyMask;
}
// cmd-opt-a gives some weird char as characters and "a" as
// charactersWithoutModifiers with an US layout, but an "a" as characters and
// a weird char as "charactersWithoutModifiers" with a cyrillic layout. Oh,
// Cocoa! Instead of getting the current layout from Text Input Services,
// and then requesting the kTISPropertyUnicodeKeyLayoutData and looking in
// there, let's try a pragmatic hack.
if ([eventString characterAtIndex:0] > 0x7f &&
[[event characters] length] > 0 &&
[[event characters] characterAtIndex:0] <= 0x7f)
eventString = [event characters];
// When both |characters| and |charactersIgnoringModifiers| are ascii, we
// want to use |characters| if it's a character and
// |charactersIgnoringModifiers| else (on dvorak, cmd-shift-z should fire
// "cmd-:" instead of "cmd-;", but on dvorak-qwerty, cmd-shift-z should fire
// cmd-shift-z instead of cmd-:).
if ([eventString characterAtIndex:0] <= 0x7f &&
[[event characters] length] > 0 &&
[[event characters] characterAtIndex:0] <= 0x7f &&
isalpha([[event characters] characterAtIndex:0]))
eventString = [event characters];
// Clear shift key for printable characters.
if ((eventModifiers & (NSNumericPadKeyMask | NSFunctionKeyMask)) == 0 &&
[[self keyEquivalent] characterAtIndex:0] != '\r')
eventModifiers &= ~NSShiftKeyMask;
// Clear all non-interesting modifiers
eventModifiers &= NSCommandKeyMask |
NSControlKeyMask |
NSAlternateKeyMask |
NSShiftKeyMask;
return [eventString isEqualToString:[self keyEquivalent]]
&& eventModifiers == [self keyEquivalentModifierMask];
}
@end
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