捕获Cocoa中的所有多点触控板输入

问题描述

使用touchesBeganWithEvent，touchesEndedWithEvent等，您可以从多点触控板获取触摸数据，但有一种方法可以阻止触摸数据移动鼠标/激活系统范围的手势（类似于中文文本输入）？

解决方案

如valexa所述，使用NSEventMask CGEventTap是一个黑客。 Tarmes还指出，Rob Keniger的回答不再有效（OS X> = 10.8）。幸运的是，Apple通过使用 kCGEventMaskForAllEvents 并将CGEventRef转换为回调中的NSEvent提供了一种方法：

  NSEventMask eventMask = NSEventMaskGesture | NSEventMaskMagnify | NSEventMaskSwipe | NSEventMaskRotate | NSEventMaskBeginGesture | NSEventMaskEndGesture; 
 
 CGEventRef eventTapCallback（CGEventTapProxy代理，CGEventType类型，CGEventRef eventRef，void * refcon）{
 //将CGEventRef转换为NSEvent 
 NSEvent * event = [NSEvent eventWithCGEvent：eventRef ]; 
 
 //过滤掉与掩码不匹配的事件
 if（！（eventMask& NSEventMaskFromType（[event type]）））{return [event CGEvent]; } 
 
 // do stuff 
 NSLog（@eventTapCallback：[event type] =％d，[event type]）; 
 
 //返回CGEventRef 
 return [event CGEvent]; 
} 
 
 void initCGEventTap（）{
 CFMachPortRef eventTap = CGEventTapCreate（kCGSessionEventTap，kCGHeadInsertEventTap，kCGEventTapOptionListenOnly，kCGEventMaskForAllEvents，eventTapCallback，nil）; 
 CFRunLoopAddSource（CFRunLoopGetCurrent（），CFMachPortCreateRunLoopSource（kCFAllocatorDefault，eventTap，0），kCFRunLoopCommonModes）; 
 CGEventTapEnable（eventTap，true）; 
 CFRunLoopRun（）;请注意，调用 CFRunLoopRun（）     code>，因为这个片段是从一个不能使用NSApplication的项目，而是一个裸机CFRunLoop。如果您使用NSApplication，请忽略它。
 
Using touchesBeganWithEvent, touchesEndedWithEvent, etc you can get the touch data from the multitouch trackpad, but is there a way to block that touch data from moving the mouse/activating the system-wide gestures (similar to what is done in the chinese text input)?
 解决方案 
As noted by valexa, using NSEventMask for CGEventTap is a hack. Tarmes also notes that Rob Keniger's answer no longer works (OS X >= 10.8). Luckily, Apple has provided a way to do this quite easily by using kCGEventMaskForAllEvents and converting the CGEventRef to an NSEvent within the callback:
NSEventMask eventMask = NSEventMaskGesture|NSEventMaskMagnify|NSEventMaskSwipe|NSEventMaskRotate|NSEventMaskBeginGesture|NSEventMaskEndGesture;

CGEventRef eventTapCallback(CGEventTapProxy proxy, CGEventType type, CGEventRef eventRef, void *refcon) {
  // convert the CGEventRef to an NSEvent
  NSEvent *event = [NSEvent eventWithCGEvent:eventRef];

  // filter out events which do not match the mask
  if (!(eventMask & NSEventMaskFromType([event type]))) { return [event CGEvent]; }

  // do stuff
  NSLog(@"eventTapCallback: [event type] = %d", [event type]);

  // return the CGEventRef
  return [event CGEvent];
}

void initCGEventTap() {
  CFMachPortRef eventTap = CGEventTapCreate(kCGSessionEventTap, kCGHeadInsertEventTap, kCGEventTapOptionListenOnly, kCGEventMaskForAllEvents, eventTapCallback, nil);
  CFRunLoopAddSource(CFRunLoopGetCurrent(), CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0), kCFRunLoopCommonModes);
  CGEventTapEnable(eventTap, true);
  CFRunLoopRun();
}
Note that the call to CFRunLoopRun() is included since this snippet was taken from a project which could not use NSApplication but instead had a bare-bones CFRunLoop. Omit it if you use NSApplication.
                        
这篇关于捕获Cocoa中的所有多点触控板输入的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！