一、鼠标点击事件响应流程简述：
1.鼠标硬件先接收到用户点击；
2.然后交给鼠标驱动来处理，这个驱动是在Mac OS X内核运行的；
3.处理完就通过I/O Kit传递给window sever的事件队列。
4.而window server则负责分派这些事件到对应进程的run-loop.
二、步骤
1.自定义MSView 继承自NSView ;
2.在MSView.m的drawRect方法中添加监控区域NSTrackingArea和监控样式
- 如果NSView不添加NSTrackingArea,即使实现了监控方法，也不会调用。
- 监控区域要使用dirtyRect,而非self.frame,否则位置会错误。
代码示例如下
- (void)drawRect:(NSRect)dirtyRect {
[super drawRect:dirtyRect];
// Drawing code here.
[self addTrackingArea:[[NSTrackingArea alloc] initWithRect:dirtyRect options:NSTrackingMouseEnteredAndExited | NSTrackingMouseMoved |
NSTrackingCursorUpdate |
NSTrackingActiveWhenFirstResponder |
NSTrackingActiveInKeyWindow |
NSTrackingActiveInActiveApp |
NSTrackingActiveAlways |
NSTrackingAssumeInside |
NSTrackingInVisibleRect |
NSTrackingEnabledDuringMouseDrag
owner:self userInfo:nil]];
[self becomeFirstResponder];
}
3、实现监控方法
在MSView.m中写下下列方法
//鼠标进入追踪区域
-(void)mouseEntered:(NSEvent *)event {
NSLog(@"mouseEntered =========");
}
//mouserEntered之后调用
-(void)cursorUpdate:(NSEvent *)event {
NSLog(@"cursorUpdate ==========");
//更改鼠标光标样式
[[NSCursor pointingHandCursor] set];
}
//鼠标退出追踪区域
-(void)mouseExited:(NSEvent *)event {
NSLog(@"mouseExited ========");
}
//鼠标左键按下
-(void)mouseDown:(NSEvent *)event {
//event.clickCount 不是累计数。双击时调用mouseDown两次，clickCount第一次=1，第二次 = 2.
if ([event clickCount] > 1) {
//双击相关处理
}
NSLog(@"mouseDown ==== clickCount: %ld buttonNumber: %ld",event.clickCount,event.buttonNumber);
self.layer.backgroundColor = [NSColor redColor].CGColor;
//获取鼠标点击位置坐标：先获取event发生的window中的坐标，在转换成view视图坐标系坐标。
NSPoint eventLocation = [event locationInWindow];
NSPoint center = [self convertPoint:eventLocation fromView:nil];
NSLog(@"center: %@",NSStringFromPoint(center));
//判断是否按下了Command键
if ([event modifierFlags] & NSEventModifierFlagCommand) {
[self setFrameRotation:[self frameRotation] + 90.0];
[self setNeedsDisplay:YES];
NSLog(@"按下了Command键 ---- ");
}
}
//鼠标左键起来
-(void)mouseUp:(NSEvent *)event {
NSLog(@"mouseUp ======");
self.layer.backgroundColor = [NSColor greenColor].CGColor;
}
//鼠标右键按下
- (void)rightMouseDown:(NSEvent *)event {
NSLog(@"rightMouseDown =======");
}
//鼠标右键起来
- (void)rightMouseUp:(NSEvent *)event {
NSLog(@"rightMouseUp ======= ");
}
//鼠标移动
- (void)mouseMoved:(NSEvent *)event {
NSLog(@"mouseMoved ========= ");
}
//鼠标按住左键进行拖拽
- (void)mouseDragged:(NSEvent *)event {
NSLog(@"mouseDragged ======== ");
}
//鼠标按住右键进行拖拽
- (void)rightMouseDragged:(NSEvent *)event {
NSLog(@"rightMouseDragged ======= ");
}
- NSView无法调用keyDown、keyUp，他们用于输入类，如NSTextField。
代码调用如下：
//
// ViewController.m
// HelloMacOS
//
// Created by xiezw on 2019/8/1.
// Copyright © 2019 xiezw. All rights reserved.
//
#import "ViewController.h"
#import "MSView.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
MSView * view = [[MSView alloc] initWithFrame:NSMakeRect(100, 100, 300, 300)];
[view setWantsLayer:YES];//开启layer支持,不然设置背景色无用
view.layer.backgroundColor = [NSColor blueColor].CGColor;
[self.view addSubview:view];
}
- (void)setRepresentedObject:(id)representedObject {
[super setRepresentedObject:representedObject];
// Update the view, if already loaded.
}
@end
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