113 lines
5.4 KiB
Objective-C
113 lines
5.4 KiB
Objective-C
#import "MASShortcutValidator.h"
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#import "MASLocalization.h"
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@implementation MASShortcutValidator
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+ (instancetype) sharedValidator
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{
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static dispatch_once_t once;
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static MASShortcutValidator *sharedInstance;
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dispatch_once(&once, ^{
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sharedInstance = [[self alloc] init];
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});
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return sharedInstance;
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}
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- (BOOL) isShortcutValid: (MASShortcut*) shortcut
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{
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NSInteger keyCode = [shortcut keyCode];
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NSEventModifierFlags modifiers = [shortcut modifierFlags];
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// Allow any function key with any combination of modifiers
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BOOL includesFunctionKey = ((keyCode == kVK_F1) || (keyCode == kVK_F2) || (keyCode == kVK_F3) || (keyCode == kVK_F4) ||
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(keyCode == kVK_F5) || (keyCode == kVK_F6) || (keyCode == kVK_F7) || (keyCode == kVK_F8) ||
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(keyCode == kVK_F9) || (keyCode == kVK_F10) || (keyCode == kVK_F11) || (keyCode == kVK_F12) ||
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(keyCode == kVK_F13) || (keyCode == kVK_F14) || (keyCode == kVK_F15) || (keyCode == kVK_F16) ||
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(keyCode == kVK_F17) || (keyCode == kVK_F18) || (keyCode == kVK_F19) || (keyCode == kVK_F20));
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if (includesFunctionKey) return YES;
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// Do not allow any other key without modifiers
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BOOL hasModifierFlags = (modifiers > 0);
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if (!hasModifierFlags) return NO;
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// Allow any hotkey containing Control or Command modifier
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BOOL includesCommand = ((modifiers & NSCommandKeyMask) > 0);
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BOOL includesControl = ((modifiers & NSControlKeyMask) > 0);
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if (includesCommand || includesControl) return YES;
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// Allow Option key only in selected cases
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BOOL includesOption = ((modifiers & NSAlternateKeyMask) > 0);
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if (includesOption) {
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// Always allow Option-Space and Option-Escape because they do not have any bind system commands
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if ((keyCode == kVK_Space) || (keyCode == kVK_Escape)) return YES;
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// Allow Option modifier with any key even if it will break the system binding
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if (_allowAnyShortcutWithOptionModifier) return YES;
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}
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// The hotkey does not have any modifiers or violates system bindings
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return NO;
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}
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- (BOOL) isShortcut: (MASShortcut*) shortcut alreadyTakenInMenu: (NSMenu*) menu explanation: (NSString**) explanation
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{
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NSString *keyEquivalent = [shortcut keyCodeStringForKeyEquivalent];
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NSEventModifierFlags flags = [shortcut modifierFlags];
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for (NSMenuItem *menuItem in menu.itemArray) {
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if (menuItem.hasSubmenu && [self isShortcut:shortcut alreadyTakenInMenu:[menuItem submenu] explanation:explanation]) return YES;
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BOOL equalFlags = (MASPickCocoaModifiers(menuItem.keyEquivalentModifierMask) == flags);
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BOOL equalHotkeyLowercase = [menuItem.keyEquivalent.lowercaseString isEqualToString:keyEquivalent];
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// Check if the cases are different, we know ours is lower and that shift is included in our modifiers
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// If theirs is capitol, we need to add shift to their modifiers
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if (equalHotkeyLowercase && ![menuItem.keyEquivalent isEqualToString:keyEquivalent]) {
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equalFlags = (MASPickCocoaModifiers(menuItem.keyEquivalentModifierMask | NSShiftKeyMask) == flags);
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}
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if (equalFlags && equalHotkeyLowercase) {
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if (explanation) {
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*explanation = MASLocalizedString(@"This shortcut cannot be used because it is already used by the menu item ‘%@’.",
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@"Message for alert when shortcut is already used");
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*explanation = [NSString stringWithFormat:*explanation, menuItem.title];
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}
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return YES;
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}
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}
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return NO;
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}
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- (BOOL) isShortcutAlreadyTakenBySystem: (MASShortcut*) shortcut explanation: (NSString**) explanation
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{
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CFArrayRef globalHotKeys;
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if (CopySymbolicHotKeys(&globalHotKeys) == noErr) {
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// Enumerate all global hotkeys and check if any of them matches current shortcut
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for (CFIndex i = 0, count = CFArrayGetCount(globalHotKeys); i < count; i++) {
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CFDictionaryRef hotKeyInfo = CFArrayGetValueAtIndex(globalHotKeys, i);
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CFNumberRef code = CFDictionaryGetValue(hotKeyInfo, kHISymbolicHotKeyCode);
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CFNumberRef flags = CFDictionaryGetValue(hotKeyInfo, kHISymbolicHotKeyModifiers);
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CFNumberRef enabled = CFDictionaryGetValue(hotKeyInfo, kHISymbolicHotKeyEnabled);
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if (([(__bridge NSNumber *)code integerValue] == [shortcut keyCode]) &&
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([(__bridge NSNumber *)flags unsignedIntegerValue] == [shortcut carbonFlags]) &&
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([(__bridge NSNumber *)enabled boolValue])) {
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if (explanation) {
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*explanation = MASLocalizedString(@"This combination cannot be used because it is already used by a system-wide "
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@"keyboard shortcut.\nIf you really want to use this key combination, most shortcuts "
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@"can be changed in the Keyboard & Mouse panel in System Preferences.",
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@"Message for alert when shortcut is already used by the system");
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}
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return YES;
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}
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}
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CFRelease(globalHotKeys);
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}
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return [self isShortcut:shortcut alreadyTakenInMenu:[NSApp mainMenu] explanation:explanation];
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}
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@end
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