macOS 开发 - MASShortcut

文章目录

- 关于 MASShortcut
- - 项目结构
- 快速使用
- 源码学习
- - 检测是否有热键冲突
  - 处理 Event

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关于 MASShortcut

MASShortcut 是一款快捷键管理工具，替代和兼容 ShortcutRecorder

github : https://github.com/cocoabits/MASShortcut

在这里插入图片描述

项目结构

model
- MASKeyCodes : 功能键和快捷键枚举
- MASShortcut : 管理 key 的组合（不管是否可用）
- MASShortcutValidator 验证shortcut 是否可用
Monitoring
- MASHotKey : 初始化和注册 MASShortcut
- MASShortcutMonitor : 注册/解除/检测 MASShortcut，监控更新
User Defaults Storage
- MASDictionaryTransformer : 转换 shortcut 数据格式，以便于存储
- MASShortcutBinder : 绑定用户操作和 shortcut
UI
- MASLocalization : 替代 NSLocalizedString，以便退出 app 时，能从 framework 种读取字符串。
- MASShortcutView : Shortcut 视图图
- MASShortcutViewButtonCell : MASShortcutView 内部的 cell 样式，可调整和重绘
- MASShortcutView+Bindings : 设置关联的默认键

快速使用

单独使用一个 MASShortcutView
你可以修改它的属性，来改变显示的样式


    MASShortcutView *shortCutView = [[MASShortcutView alloc] initWithFrame:NSMakeRect(10, 10, 200, 50)];
    [self.window.contentView addSubview:shortCutView];
    
    shortCutView.wantsLayer = YES;
    shortCutView.layer.backgroundColor = [NSColor blueColor].CGColor;

源码学习

检测是否有热键冲突

MASShortcutValidator.m

- (BOOL) isShortcutAlreadyTakenBySystem:(MASShortcut *)shortcut explanation: (NSString**) explanation
{
    CFArrayRef globalHotKeys;
    if (CopySymbolicHotKeys(&globalHotKeys) == noErr) {

        // Enumerate all global hotkeys and check if any of them matches current shortcut
        for (CFIndex i = 0, count = CFArrayGetCount(globalHotKeys); i < count; i++) {
            
            CFDictionaryRef hotKeyInfo = CFArrayGetValueAtIndex(globalHotKeys, i);
            
            CFNumberRef code = CFDictionaryGetValue(hotKeyInfo, kHISymbolicHotKeyCode);
            CFNumberRef flags = CFDictionaryGetValue(hotKeyInfo, kHISymbolicHotKeyModifiers);
            CFNumberRef enabled = CFDictionaryGetValue(hotKeyInfo, kHISymbolicHotKeyEnabled);

            if (([(__bridge NSNumber *)code integerValue] == [shortcut keyCode]) &&
                ([(__bridge NSNumber *)flags unsignedIntegerValue] == [shortcut carbonFlags]) &&
                ([(__bridge NSNumber *)enabled boolValue])) {

                if (explanation) {
                    *explanation = MASLocalizedString(@"This combination cannot be used because it is already used by a system-wide "
                                                     @"keyboard shortcut.\nIf you really want to use this key combination, most shortcuts "
                                                     @"can be changed in the Keyboard & Mouse panel in System Preferences.",
                                                     @"Message for alert when shortcut is already used by the system");
                }
                return YES;
            }
        }
        CFRelease(globalHotKeys);
    }
    return [self isShortcut:shortcut alreadyTakenInMenu:[NSApp mainMenu] explanation:explanation];
}

CopySymbolicHotKeys 来自 Carbon – HiToolbox – CarbonEvents.h

处理 Event

- (void) handleEvent: (EventRef) event
{
    if (GetEventClass(event) != kEventClassKeyboard) {
        return;
    }

    EventHotKeyID hotKeyID;
    OSStatus status = GetEventParameter(event, kEventParamDirectObject, typeEventHotKeyID, NULL, sizeof(hotKeyID), NULL, &hotKeyID);
    if (status != noErr || hotKeyID.signature != MASHotKeySignature) {
        return;
    }

    [_hotKeys enumerateKeysAndObjectsUsingBlock:^(MASShortcut *shortcut, MASHotKey *hotKey, BOOL *stop) {
        if (hotKeyID.id == [hotKey carbonID]) {
            if ([hotKey action]) {
                dispatch_async(dispatch_get_main_queue(), [hotKey action]);
            }
            *stop = YES;
        }
    }];
}