104 lines
5.9 KiB
Swift
104 lines
5.9 KiB
Swift
import SwiftUI
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import AppKit
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struct DJLoopDrag {
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enum Mode { case seek, start, end, move, create }
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let mode: Mode
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let viewport: Double
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let secondsPerPixel: Double
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let anchor: Double
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let original: ClosedRange<Double>?
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init(x: Double,viewport: Double,span: Double,width: Double,loop: ClosedRange<Double>?,create: Bool) {
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self.viewport = viewport;secondsPerPixel = span/max(1,width);anchor = viewport+x*secondsPerPixel;original = loop
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if create { mode = .create }
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else if let loop {
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let left = abs(anchor-loop.lowerBound),right = abs(anchor-loop.upperBound),tolerance = min(8*secondsPerPixel,(loop.upperBound-loop.lowerBound)/4)
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if min(left,right) <= tolerance { mode = left <= right ? .start : .end }
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else if loop.contains(anchor) { mode = .move }
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else { mode = .seek }
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} else { mode = .seek }
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}
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func range(x: Double,duration: Double) -> ClosedRange<Double>? {
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guard duration >= 0.1,secondsPerPixel > 0 else { return nil }
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let point = min(duration,max(0,viewport+x*secondsPerPixel))
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switch mode {
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case .seek: return nil
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case .create:
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let first = min(duration,max(0,anchor)),start = min(duration-0.1,min(first,point))
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return start...min(duration,max(start+0.1,max(first,point)))
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case .start:
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guard let original else { return nil };return min(point,original.upperBound-0.1)...original.upperBound
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case .end:
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guard let original else { return nil };return original.lowerBound...max(original.lowerBound+0.1,point)
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case .move:
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guard let original else { return nil }
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let length = original.upperBound-original.lowerBound
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let start = min(duration-length,max(0,original.lowerBound+(viewport+x*secondsPerPixel-anchor)))
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return start...(start+length)
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}
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}
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}
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struct DJLoopWaveInteraction: ViewModifier {
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@ObservedObject var player: Player
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let start: Double
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let span: Double
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let width: Double
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@Binding var frozenStart: Double?
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@State private var drag: DJLoopDrag?
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func body(content: Content) -> some View {
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content.contentShape(Rectangle())
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.gesture(DragGesture(minimumDistance:0).onChanged { value in
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guard player.canJog,span > 0 else { return }
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if drag == nil {
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let loop = player.loopEnabled ? player.loopIn.flatMap { a in player.loopOut.map { a...$0 } } : nil
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drag = DJLoopDrag(x:value.startLocation.x,viewport:start,span:span,width:width,loop:loop,create:NSEvent.modifierFlags.contains(.shift))
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frozenStart = start
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}
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guard let drag else { return }
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if let range = drag.range(x:value.location.x,duration:player.duration) { player.defineLoop(start:range.lowerBound,end:range.upperBound) }
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else if drag.mode == .seek { player.seek(drag.viewport+value.location.x*drag.secondsPerPixel) }
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}.onEnded { _ in drag = nil;frozenStart = nil })
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.onChange(of:player.currentSongID) { _ in drag = nil;frozenStart = nil }
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.onContinuousHover { phase in
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switch phase {
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case .active(let point):
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let loop = player.loopEnabled ? player.loopIn.flatMap { a in player.loopOut.map { a...$0 } } : nil
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let mode = DJLoopDrag(x:point.x,viewport:frozenStart ?? start,span:span,width:width,loop:loop,create:NSEvent.modifierFlags.contains(.shift)).mode
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switch mode {
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case .start,.end: NSCursor.resizeLeftRight.set()
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case .move: NSCursor.openHand.set()
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case .create: NSCursor.crosshair.set()
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case .seek: NSCursor.arrow.set()
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}
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case .ended: NSCursor.arrow.set()
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}
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}
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.help("Drag green IN/OUT edges to resize; drag inside the loop to move it. Shift-drag to define a new loop. Drag outside it to seek.")
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}
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}
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struct DJLoopEditor: View {
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@ObservedObject var player: Player
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let letter: String
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@State private var start: Double
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@State private var end: Double
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@Environment(\.dismiss) private var dismiss
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init(player: Player,letter: String) {
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self.player = player;self.letter = letter
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let first = player.loopIn ?? min(max(0,player.time),max(0,player.duration-0.1))
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_start = State(initialValue:first);_end = State(initialValue:player.loopOut ?? min(player.duration,first+4))
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}
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private var valid: Bool { start.isFinite && end.isFinite && start >= 0 && end <= player.duration && end-start >= 0.1-1e-9 }
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var body: some View {
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VStack(alignment:.leading,spacing:18) {
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Text("Deck \(letter) · Loop Points").font(.title2.bold())
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HStack { Text("Start (seconds)").frame(width:120,alignment:.leading);TextField("Start",value:$start,format:.number.precision(.fractionLength(3))).textFieldStyle(.roundedBorder);Button("Use Playhead") { start = player.time } }
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HStack { Text("End (seconds)").frame(width:120,alignment:.leading);TextField("End",value:$end,format:.number.precision(.fractionLength(3))).textFieldStyle(.roundedBorder);Button("Use Playhead") { end = player.time } }
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Text(valid ? String(format:"Loop length: %.3f seconds",end-start) : "End must be at least 0.1 seconds after start, within the track.").font(.caption).foregroundStyle(valid ? Color.secondary : Color.orange)
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Text("On either waveform, drag the green edges to resize or the loop region to move. Shift-drag defines a new loop. Playback continues while editing.").font(.callout).foregroundStyle(.secondary)
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HStack { Button("Cancel") { dismiss() };Spacer();Button("Activate Loop") { player.defineLoop(start:start,end:end);dismiss() }.disabled(!valid || !player.canJog).keyboardShortcut(.defaultAction) }
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}.padding(24).frame(width:540)
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}
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}
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