79 lines
3.0 KiB
Swift
79 lines
3.0 KiB
Swift
import AppKit
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import SwiftUI
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/// 弹窗窗口的底板：圆角裁切的普通容器，背景由 SwiftUI 内容绘制
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@MainActor
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enum PanelContainer {
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/// 容器必须从内容的尺寸开始：若从 0 开始，窗口把它撑满时自动调整会把内容再放大一倍
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static func make(containing content: NSView, cornerRadius: CGFloat) -> NSView {
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let container = NSView(frame: content.frame)
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container.wantsLayer = true
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container.layer?.cornerRadius = cornerRadius
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container.layer?.cornerCurve = .continuous
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container.layer?.masksToBounds = true
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content.autoresizingMask = [.width, .height]
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container.addSubview(content)
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return container
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}
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}
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/// 内容铺满标题栏后，标题栏区域由 SwiftUI 接收点击；放在顶栏背后，按住空白处可以拖动窗口
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struct WindowDragArea: NSViewRepresentable {
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final class DragView: NSView {
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override func mouseDown(with event: NSEvent) {
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if event.clickCount == 2 {
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window?.performZoom(nil)
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} else {
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window?.performDrag(with: event)
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}
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}
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}
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func makeNSView(context: Context) -> DragView { DragView() }
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func updateNSView(_ nsView: DragView, context: Context) {}
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}
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/// 滚动条只在滚动时出现：把所在的 NSScrollView 固定为浮层样式。
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/// 系统设置为“始终显示滚动条”或接了鼠标时，SwiftUI 默认会一直显示一条占位的滚动条
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struct OverlayScrollers: NSViewRepresentable {
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final class Probe: NSView {
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private var observer: NSObjectProtocol?
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override func viewDidMoveToWindow() {
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super.viewDidMoveToWindow()
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guard window != nil else {
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if let observer { NotificationCenter.default.removeObserver(observer) }
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observer = nil
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return
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}
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apply()
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guard observer == nil else { return }
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// 系统切换滚动条样式时会重置，收到通知后重新设置
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observer = NotificationCenter.default.addObserver(forName: NSScroller.preferredScrollerStyleDidChangeNotification,
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object: nil, queue: .main) { [weak self] _ in
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MainActor.assumeIsolated { self?.apply() }
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}
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}
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func apply() {
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DispatchQueue.main.async { [weak self] in
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MainActor.assumeIsolated {
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guard let scrollView = self?.enclosingScrollView else { return }
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scrollView.scrollerStyle = .overlay
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scrollView.autohidesScrollers = true
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}
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}
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}
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}
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func makeNSView(context: Context) -> Probe { Probe() }
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func updateNSView(_ nsView: Probe, context: Context) { nsView.apply() }
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}
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extension View {
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/// 放在 ScrollView 的内容里：滚动条改为浮层，只在滚动时显示
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func overlayScrollers() -> some View {
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background(OverlayScrollers().frame(width: 0, height: 0))
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}
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}
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