多屏幕环境
在多屏幕环境下，各个屏幕的起始坐标origin会根据用户在系统偏好设置中对显示器排列的设置而不同，下图直观地表示了多屏幕环境下各屏幕的坐标。
通过screen.visibleFrame可以访问屏幕在此坐标系下的frame。
实现思路
- 在ClipManager.shared.start()中检测所有屏幕并创建控制器
- 对于每个控制器，获取对应显示器当前页面图像
- 在执行Pin操作时，需要将窗口偏移到正确的位置
class ClipManager {
// ....
var controllers: [ClipWindowController] = []
// ....
func start() {
NotificationCenter.default.post(name: NotiNames.pinNormal.name, object: nil)
NSApplication.shared.activate(ignoringOtherApps: true)
for screen in NSScreen.screens { // 获取所有屏幕
let view = ClipView(frame: screen.frame)
let clipWindow = ClipWindow(contentRect: screen.frame, contentView: view)
let clipWindowController = ClipWindowController(window: clipWindow)
controllers.append(clipWindowController)
self.status = .ready
clipWindowController.capture(screen)
}
}
// ....
}
在ClipWindowController中获取各屏幕的图像：
class ClipWindowController: NSWindowController {
func capture(_ screen:NSScreen) {
guard let window = self.window else { return }
// 获取screen对应的displayID和ID对应的图像
guard let displayID = screen.deviceDescription[NSDeviceDescriptionKey(rawValue: "NSScreenNumber")] as? CGDirectDisplayID,
let cgScreenImage = CGDisplayCreateImage(displayID)
else { return }
self.screenImage = NSImage(cgImage: cgScreenImage, size: screen.frame.size)
window.backgroundColor = NSColor(white: 0, alpha: 0.5)
self.clipView = window.contentView as? ClipView
self.showWindow(nil)
}
}
在PinManager中修改pin函数，将屏幕起始坐标增加为新的参数，并对pin窗口进行偏移：
class PinManager: NSObject {
func pin(rep: NSBitmapImageRep, rect:NSRect, screenOrigin:NSPoint) {
let image = NSImage(size: rect.size)
image.addRepresentation(rep)
let view = PinView(image: image)
let window = PinWindow(rect: rect, contentView: view)
let controller = PinWindowController(window: window)
self.controllers.append(controller)
// 以屏幕左下角坐标为基准，偏移pin窗口
window.setFrameOrigin(screenOrigin.offsetBy(dx: rect.origin.x, dy: rect.origin.y))
controller.showWindow(nil)
NotificationCenter.default.post(name: NotiNames.pinEnd.name, object: nil)
}
}
同时在调用pin函数时增加对屏幕起始坐标参数的传入：
// ClipWindowController.swift
@objc func done() {
guard let view = self.clipView,
let rect = view.drawingRect
else {
return
}
guard let bitmapRep = view.bitmapImageRepForCachingDisplay(in: rect),
let window = self.window,
let screen = window.screen
else {return}
view.cacheDisplay(in: rect, to: bitmapRep)
PinManager.shared.pin(rep: bitmapRep, rect: rect, screenOrigin: screen.visibleFrame.origin)
}
接下来是对截屏的一些优化