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72 lines
2.4 KiB
Objective-C
72 lines
2.4 KiB
Objective-C
/*
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* Keyman is copyright (C) SIL International. MIT License.
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*
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* Created by Shawn Schantz on 2024-09-25.
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*
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* Contains the logic that determines whether the right and left
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* options keys both cause the same character to be generated or
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* whether each option key results in a unique key combination.
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*/
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#import "KMModifierMapping.h"
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#import <KeymanEngine4Mac/KeymanEngine4Mac.h>
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#import "KMLogs.h"
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@interface KMModifierMapping ()
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@property (nonatomic, strong) CoreKeyboardInfo *keyboardInfo;
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@end
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@implementation KMModifierMapping
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const NSEventModifierFlags LEFT_OPTION_MASK = 0x80120;
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const NSEventModifierFlags RIGHT_OPTION_MASK = 0x80140;
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+(BOOL)containsLeftOptionFlag:(NSEventModifierFlags)modifiers {
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return (modifiers & LEFT_OPTION_MASK) == LEFT_OPTION_MASK;
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}
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-(instancetype)init:(CoreKeyboardInfo*)keyboardInfo {
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self = [super init];
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if (self) {
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_keyboardInfo = keyboardInfo;
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}
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return self;
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}
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-(BOOL)optionKeysUnused {
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return !(self.keyboardInfo.containsRightAlt ||
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self.keyboardInfo.containsLeftAlt ||
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self.keyboardInfo.containsAlt);
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}
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-(BOOL)bothOptionKeysGenerateRightAlt {
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return (self.keyboardInfo.containsRightAlt || self.keyboardInfo.containsAlt) && !self.keyboardInfo.containsLeftAlt;
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}
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/**
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* If necessary, change the modifiers so that it appears that the right option key was pressed instead of the
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* left option key. This will trigger keyboard rules that are defined for right option because both option keys
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* usually have the same meaning on the Mac.
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*/
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- (NSEventModifierFlags) adjustModifiers:(NSEventModifierFlags)originalModifiers {
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NSEventModifierFlags newModifiers = originalModifiers;
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if (self.bothOptionKeysGenerateRightAlt) {
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// if original includes left option key, then replace it with the right option key
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if ([KMModifierMapping containsLeftOptionFlag:originalModifiers]) {
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// clear all left option bits
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newModifiers = originalModifiers & ~LEFT_OPTION_MASK;
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// set all right option bits
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newModifiers = newModifiers | RIGHT_OPTION_MASK;
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os_log_debug([KMLogs eventsLog], "adjustModifiers, changing from originalModifiers: 0x%lX to newModifiers: 0x%lX", originalModifiers, newModifiers);
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}
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} else {
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os_log_debug([KMLogs eventsLog], "adjustModifiers, retaining originalModifiers: 0x%lX", (unsigned long)originalModifiers);
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}
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return newModifiers;
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}
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@end
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