From 4d4294f8c375a06ad87e12a2c73a98a19eb7ed7e Mon Sep 17 00:00:00 2001
From: Ariver <shanghai3168@gmail.com>
Date: Sun, 14 Jun 2026 18:46:39 +0800
Subject: [PATCH] Add Quick Switch view mode toggle

---
 C1.source/Sources/Aligner/QuickSwitchRootView.swift |  550 +++++++++++++++++++++++++++++++++++++++++++++++-------
 1 files changed, 473 insertions(+), 77 deletions(-)

diff --git a/C1.source/Sources/Aligner/QuickSwitchRootView.swift b/C1.source/Sources/Aligner/QuickSwitchRootView.swift
index e001bc4..6675a87 100644
--- a/C1.source/Sources/Aligner/QuickSwitchRootView.swift
+++ b/C1.source/Sources/Aligner/QuickSwitchRootView.swift
@@ -24,6 +24,8 @@
     private lazy var closeConfirmationLayers = makeCloseConfirmationLayers()
     private let closeFeedbackLayer = CALayer()
     private let closeFeedbackTextLayer = CATextLayer()
+    private let viewModeToggleButtonLayer = CALayer()
+    private let viewModeToggleIconLayer = CALayer()
     private let appIconProvider: any AppIconProviderProtocol = WorkspaceAppIconProvider()
     private let skeletonThumbnailProvider = NativeSkeletonThumbnailProvider(size: NSSize(width: 160, height: 96))
     private var screenshotSourcesByWindowID: [UInt32: ScreenshotResolutionSource] = [:]
@@ -49,6 +51,7 @@
     private var closeConfirmationRequired = true
     private var closeFeedback: CloseFeedback?
     private var closeFeedbackHideTask: Task<Void, Never>?
+    private var isViewModeToggleButtonHovered = false
     private var hoverTarget: HoverTarget = .none
     private var hoverTargetSource: HoverTargetSource = .event
     private var hoveredSpaceLaneID: UInt64?
@@ -91,6 +94,7 @@
     var onCommitSelection: ((QuickSwitchSelection, QuickSwitchCommitSource) -> Void)?
     var onSpaceLaneClick: ((UInt64, Int) -> Void)?
     var onBackgroundClick: (() -> Bool)?
+    var onToggleWaterfallViewMode: (() -> Void)?
     var onRequestClose: ((QuickSwitchCloseRequest) -> Void)?
     var onCloseConfirmationDisabled: (() -> Void)?
 
@@ -221,6 +225,7 @@
         let labelLayer: CATextLayer
         let countLayer: CATextLayer
         let appLayer: CATextLayer
+        let splitAppLayers: [CATextLayer]
         let windowBlocks: [CALayer]
         let fullscreenMarkerLayer: CALayer?
     }
@@ -322,13 +327,11 @@
     private enum HorizontalMasonryMetrics {
         static let horizontalPadding: CGFloat = 12
         static let verticalPadding: CGFloat = 0
-        static let cardGap: CGFloat = 16
+        static let horizontalGap: CGFloat = 16
+        static let verticalGap: CGFloat = WaterfallMetrics.cardGap
         static let cardMinWidth: CGFloat = 220
         static let cardMaxWidth: CGFloat = 320
-        static let titleBarHeight: CGFloat = 26
-        static let titleGap: CGFloat = 6
-        static let minThumbnailHeight: CGFloat = 92
-        static let maxThumbnailHeightFraction: CGFloat = 0.40
+        static let cardHeight: CGFloat = WaterfallMetrics.cardHeight
     }
 
     private enum WaterfallHorizontalIntent {
@@ -481,6 +484,17 @@
     override func mouseMoved(with event: NSEvent) {
         guard debugHoveredAppGroupIndex == nil else { return }
 
+        let toggleHovered = viewModeToggleButtonContains(windowLocation: event.locationInWindow)
+        if isViewModeToggleButtonHovered != toggleHovered {
+            isViewModeToggleButtonHovered = toggleHovered
+            needsLayout = true
+        }
+        if toggleHovered {
+            hoveredCloseTarget = nil
+            setHoverTarget(.none)
+            return
+        }
+
         let closeTarget = closeButtonTarget(at: event.locationInWindow)
         if hoveredCloseTarget != closeTarget {
             hoveredCloseTarget = closeTarget
@@ -491,6 +505,7 @@
 
     override func mouseExited(with event: NSEvent) {
         guard debugHoveredAppGroupIndex == nil else { return }
+        isViewModeToggleButtonHovered = false
         hoveredCloseTarget = nil
         setHoverTarget(.none)
     }
@@ -506,6 +521,11 @@
         }
 
         if handleCloseConfirmationMouseDown(at: event.locationInWindow) {
+            return
+        }
+
+        if viewModeToggleButtonContains(windowLocation: event.locationInWindow) {
+            clickViewModeToggleButton(source: "mouse")
             return
         }
 
@@ -1060,6 +1080,14 @@
             "activeSpaceFocusID": activeSpaceFocusID ?? NSNull(),
             "spaceFilterLockedSpaceID": currentViewModel?.lockedSpaceID ?? NSNull(),
             "spaceFilterActive": currentViewModel?.lockedSpaceID != nil,
+            "viewModeToggleButtonVisible": !viewModeToggleButtonLayer.isHidden,
+            "viewModeToggleButtonHovered": isViewModeToggleButtonHovered,
+            "viewModeToggleButtonFrame": dictionary(from: viewModeToggleButtonLayer.frame),
+            "viewModeToggleCurrentMode": waterfallViewMode.rawValue,
+            "viewModeToggleTargetMode": nextWaterfallViewMode.rawValue,
+            "viewModeToggleIconKind": viewModeToggleIconKind,
+            "viewModeToggleAccessibilityLabel": viewModeToggleAccessibilityLabel,
+            "settingsButtonVisible": false,
             "spaceFocusAppGroupIndexes": spaceFocusedAppGroupIndexes(),
             "appHoverAssociatedSpaceIDs": appHoverAssociatedSpaceIDs.sorted(),
             "appHoverAssociatedSpaceLabels": appHoverAssociatedSpaceLabels,
@@ -1302,6 +1330,9 @@
         case "click-background":
             recordMouseCommand("click-background")
             _ = onBackgroundClick?()
+        case "click-view-toggle", "click-settings":
+            recordMouseCommand("click-view-toggle")
+            clickViewModeToggleButton(source: "debug")
         case "hover-card" where parts.count == 3:
             guard let appGroupIndex = Int(parts[1]), let windowIndex = Int(parts[2]) else {
                 recordMouseCommand("invalid:\(command)")
@@ -1318,6 +1349,15 @@
             }
             recordMouseCommand("click-card:\(appGroupIndex):\(windowIndex)")
             if let card = waterfallCard(appGroupIndex: appGroupIndex, windowIndex: windowIndex) {
+                clickWindowCard(card)
+            }
+        case "click-card-id" where parts.count == 2:
+            guard let windowID = UInt32(parts[1]) else {
+                recordMouseCommand("invalid:\(command)")
+                return
+            }
+            recordMouseCommand("click-card-id:\(windowID)")
+            if let card = waterfallCard(windowID: windowID) {
                 clickWindowCard(card)
             }
         case "hover-card-close" where parts.count == 3:
@@ -2244,6 +2284,16 @@
         closeFeedbackTextLayer.truncationMode = .end
         closeFeedbackLayer.addSublayer(closeFeedbackTextLayer)
         glassLayer.addSublayer(closeFeedbackLayer)
+
+        viewModeToggleButtonLayer.cornerRadius = 10
+        viewModeToggleButtonLayer.masksToBounds = false
+        viewModeToggleButtonLayer.borderWidth = 1
+        viewModeToggleButtonLayer.shadowColor = NSColor.black.cgColor
+        viewModeToggleButtonLayer.shadowOffset = CGSize(width: 0, height: -2)
+        viewModeToggleButtonLayer.zPosition = 170
+        viewModeToggleIconLayer.contentsScale = backingScaleFactor
+        viewModeToggleButtonLayer.addSublayer(viewModeToggleIconLayer)
+        glassLayer.addSublayer(viewModeToggleButtonLayer)
     }
 
     private func rebuildAppShelfItems() {
@@ -2494,6 +2544,15 @@
                     color: space.type == .fullscreen ? .labelColor : .secondaryLabelColor,
                     alignment: space.type == .fullscreen ? .center : .left
                 )
+                let splitAppLayers = splitViewAppNames(for: space).map { name in
+                    makeTextLayer(
+                        string: name,
+                        fontSize: 12,
+                        weight: .medium,
+                        color: .labelColor,
+                        alignment: .center
+                    )
+                }
                 let windowBlocks = space.type == .fullscreen
                     ? []
                     : makeWindowBlocks(count: min(space.windowCount, 5), space: space)
@@ -2504,6 +2563,9 @@
                 container.addSublayer(appLayer)
                 if let fullscreenMarkerLayer {
                     container.addSublayer(fullscreenMarkerLayer)
+                }
+                for splitAppLayer in splitAppLayers {
+                    container.addSublayer(splitAppLayer)
                 }
                 for block in windowBlocks {
                     container.addSublayer(block)
@@ -2516,6 +2578,7 @@
                     labelLayer: labelLayer,
                     countLayer: countLayer,
                     appLayer: appLayer,
+                    splitAppLayers: splitAppLayers,
                     windowBlocks: windowBlocks,
                     fullscreenMarkerLayer: fullscreenMarkerLayer
                 )
@@ -2581,8 +2644,155 @@
         layoutWaterfallColumns()
         layoutCloseConfirmation()
         layoutCloseFeedback()
+        layoutViewModeToggleButton()
 
         CATransaction.commit()
+    }
+
+    private func layoutViewModeToggleButton() {
+        let size: CGFloat = 34
+        let topMargin = topSafeAreaInset + RootLayoutMetrics.topContentMargin
+        let x = max(
+            RootLayoutMetrics.horizontalMargin,
+            glassLayer.bounds.width - RootLayoutMetrics.horizontalMargin - size
+        )
+        let y = max(
+            RootLayoutMetrics.bottomMargin,
+            glassLayer.bounds.height - topMargin - size
+        )
+        viewModeToggleButtonLayer.frame = CGRect(x: x, y: y, width: size, height: size)
+        viewModeToggleButtonLayer.backgroundColor = NSColor.windowBackgroundColor
+            .withAlphaComponent(isViewModeToggleButtonHovered ? 0.78 : 0.54)
+            .cgColor
+        viewModeToggleButtonLayer.borderColor = NSColor.separatorColor
+            .withAlphaComponent(isViewModeToggleButtonHovered ? 0.42 : 0.26)
+            .cgColor
+        viewModeToggleButtonLayer.shadowOpacity = isViewModeToggleButtonHovered ? 0.14 : 0.08
+        viewModeToggleButtonLayer.shadowRadius = isViewModeToggleButtonHovered ? 9 : 6
+        viewModeToggleIconLayer.contentsScale = backingScaleFactor
+        let iconInset: CGFloat = 7
+        viewModeToggleIconLayer.frame = viewModeToggleButtonLayer.bounds.insetBy(dx: iconInset, dy: iconInset)
+        layoutViewModeToggleIcon()
+    }
+
+    private func layoutViewModeToggleIcon() {
+        CATransaction.begin()
+        CATransaction.setDisableActions(true)
+        viewModeToggleIconLayer.sublayers?.forEach { $0.removeFromSuperlayer() }
+
+        let bounds = viewModeToggleIconLayer.bounds
+        guard bounds.width > 0, bounds.height > 0 else {
+            CATransaction.commit()
+            return
+        }
+
+        let activeStroke = (isViewModeToggleButtonHovered
+            ? NSColor.controlAccentColor
+            : NSColor.secondaryLabelColor
+        ).withAlphaComponent(isViewModeToggleButtonHovered ? 0.88 : 0.82)
+        let quietStroke = (isViewModeToggleButtonHovered
+            ? NSColor.controlAccentColor
+            : NSColor.secondaryLabelColor
+        ).withAlphaComponent(isViewModeToggleButtonHovered ? 0.34 : 0.24)
+        let subtleFill = (isViewModeToggleButtonHovered
+            ? NSColor.controlAccentColor
+            : NSColor.labelColor
+        ).withAlphaComponent(isViewModeToggleButtonHovered ? 0.06 : 0.025)
+
+        addViewModeToggleRoundedRect(
+            bounds.insetBy(dx: 0.65, dy: 0.65),
+            cornerRadius: 4.8,
+            strokeColor: quietStroke,
+            fillColor: NSColor.clear,
+            lineWidth: 1.05
+        )
+
+        switch nextWaterfallViewMode {
+        case .verticalColumns:
+            addVerticalColumnsToggleGlyph(
+                in: bounds.insetBy(dx: 4.15, dy: 3.25),
+                strokeColor: activeStroke,
+                fillColor: subtleFill
+            )
+        case .horizontalMasonry:
+            addHorizontalMasonryToggleGlyph(
+                in: bounds.insetBy(dx: 3.95, dy: 3.95),
+                strokeColor: activeStroke,
+                fillColor: subtleFill
+            )
+        }
+
+        CATransaction.commit()
+    }
+
+    private func addVerticalColumnsToggleGlyph(
+        in rect: CGRect,
+        strokeColor: NSColor,
+        fillColor: NSColor
+    ) {
+        let columnWidth: CGFloat = 3.35
+        let gap = max(1.7, (rect.width - columnWidth * 3) / 2)
+        for index in 0..<3 {
+            let x = rect.minX + CGFloat(index) * (columnWidth + gap)
+            let columnRect = CGRect(x: x, y: rect.minY, width: columnWidth, height: rect.height)
+            addViewModeToggleRoundedRect(
+                columnRect,
+                cornerRadius: 1.6,
+                strokeColor: strokeColor,
+                fillColor: fillColor,
+                lineWidth: 1.22
+            )
+        }
+    }
+
+    private func addHorizontalMasonryToggleGlyph(
+        in rect: CGRect,
+        strokeColor: NSColor,
+        fillColor: NSColor
+    ) {
+        let cellSize: CGFloat = 3.65
+        let gapX = max(1.65, (rect.width - cellSize * 3) / 2)
+        let gapY = max(1.65, (rect.height - cellSize * 3) / 2)
+        for row in 0..<3 {
+            for column in 0..<3 {
+                let cellRect = CGRect(
+                    x: rect.minX + CGFloat(column) * (cellSize + gapX),
+                    y: rect.minY + CGFloat(row) * (cellSize + gapY),
+                    width: cellSize,
+                    height: cellSize
+                )
+                addViewModeToggleRoundedRect(
+                    cellRect,
+                    cornerRadius: 1.15,
+                    strokeColor: strokeColor,
+                    fillColor: fillColor,
+                    lineWidth: 1.18
+                )
+            }
+        }
+    }
+
+    private func addViewModeToggleRoundedRect(
+        _ rect: CGRect,
+        cornerRadius: CGFloat,
+        strokeColor: NSColor,
+        fillColor: NSColor,
+        lineWidth: CGFloat
+    ) {
+        let layer = CAShapeLayer()
+        layer.contentsScale = backingScaleFactor
+        layer.frame = viewModeToggleIconLayer.bounds
+        layer.path = CGPath(
+            roundedRect: rect,
+            cornerWidth: cornerRadius,
+            cornerHeight: cornerRadius,
+            transform: nil
+        )
+        layer.fillColor = fillColor.cgColor
+        layer.strokeColor = strokeColor.cgColor
+        layer.lineWidth = lineWidth
+        layer.lineJoin = .round
+        viewModeToggleIconLayer.addSublayer(layer)
     }
 
     private var topSafeAreaInset: CGFloat {
@@ -2770,10 +2980,10 @@
         let isActive = isHovered || isFocused || isLocked
         let isAssociated = (isAppAssociated || isWindowAssociated) && !isActive
 
-        segment.containerLayer.borderWidth = isLocked
-            ? 6
-            : (hasWindows || isCurrent || isActive || isAssociated) ? 1.5 : 1
-        segment.containerLayer.borderColor = (isActive
+        segment.containerLayer.borderWidth = (hasWindows || isCurrent || isActive || isAssociated) ? 1.5 : 1
+        segment.containerLayer.borderColor = (isLocked
+            ? NSColor.white.withAlphaComponent(0.86)
+            : isActive
             ? spaceLaneOccupiedColor.withAlphaComponent(isLocked ? 0.92 : 0.62)
             : isAssociated
                 ? spaceLaneOccupiedColor.withAlphaComponent(0.50)
@@ -2783,7 +2993,12 @@
                     ? NSColor.labelColor.withAlphaComponent(0.34)
                 : NSColor.separatorColor.withAlphaComponent(0.34)
         ).cgColor
-        if !hasWindows {
+        if isLocked {
+            applySpaceLaneSolidFill(
+                to: segment.containerLayer,
+                color: spaceLaneLockedFillColor
+            )
+        } else if !hasWindows {
             applySpaceLaneSolidFill(to: segment.containerLayer, color: .clear)
         } else if isActive {
             applySpaceLaneSolidFill(
@@ -2818,7 +3033,7 @@
         segment.containerLayer.transform = (isActive || isAssociated)
             ? CATransform3DMakeScale(isActive ? 1.03 : 1.015, isActive ? 1.03 : 1.015, 1)
             : CATransform3DIdentity
-        segment.containerLayer.shadowPath = hasWindows
+        segment.containerLayer.shadowPath = (hasWindows || isLocked)
             ? CGPath(
                 roundedRect: segment.containerLayer.bounds,
                 cornerWidth: segment.containerLayer.cornerRadius,
@@ -2826,6 +3041,37 @@
                 transform: nil
             )
             : nil
+
+        applySpaceLaneContentVisualState(segment, isLocked: isLocked)
+    }
+
+    private func applySpaceLaneContentVisualState(_ segment: SpaceLaneSegmentLayers, isLocked: Bool) {
+        let primaryTextColor: NSColor = isLocked ? .white : .labelColor
+        let secondaryTextColor: NSColor = isLocked
+            ? .white
+            : .secondaryLabelColor
+
+        segment.labelLayer.foregroundColor = primaryTextColor.cgColor
+        segment.countLayer.foregroundColor = (isLocked ? NSColor.white : .secondaryLabelColor).cgColor
+        segment.appLayer.foregroundColor = (segment.space.type == .fullscreen
+            ? primaryTextColor
+            : secondaryTextColor
+        ).cgColor
+        for splitAppLayer in segment.splitAppLayers {
+            splitAppLayer.foregroundColor = primaryTextColor.cgColor
+        }
+
+        for block in segment.windowBlocks {
+            block.backgroundColor = (isLocked
+                ? NSColor.white
+                : spaceLaneOccupiedColor.withAlphaComponent(segment.space.isCurrent ? 0.72 : 0.58)
+            ).cgColor
+        }
+
+        (segment.fullscreenMarkerLayer as? CAShapeLayer)?.strokeColor = (isLocked
+            ? NSColor.white
+            : NSColor.secondaryLabelColor.withAlphaComponent(segment.space.isCurrent ? 0.42 : 0.28)
+        ).cgColor
     }
 
     private func shouldScrollSpaceLane(for event: NSEvent) -> Bool {
@@ -2898,6 +3144,28 @@
         spaceLaneSegments.first { $0.space.id == spaceID }
     }
 
+    private func viewModeToggleButtonContains(windowLocation: CGPoint) -> Bool {
+        let locationInView = convert(windowLocation, from: nil)
+        let locationInGlass = CGPoint(
+            x: locationInView.x - glassLayer.frame.minX,
+            y: locationInView.y - glassLayer.frame.minY
+        )
+        return viewModeToggleButtonLayer.frame.contains(locationInGlass)
+    }
+
+    private func clickViewModeToggleButton(source: String) {
+        DevelopmentDiagnostics.log("quickSwitch.view.clickWaterfallViewModeToggle", [
+            "source": source,
+            "currentMode": waterfallViewMode.rawValue,
+            "targetMode": nextWaterfallViewMode.rawValue
+        ])
+        lastMouseCommand = "click-view-toggle"
+        if !mouseCommandsApplied.contains("click-view-toggle") {
+            mouseCommandsApplied.append("click-view-toggle")
+        }
+        onToggleWaterfallViewMode?()
+    }
+
     private func appShelfItem(at windowLocation: CGPoint) -> AppShelfItemLayers? {
         let locationInView = convert(windowLocation, from: nil)
         let locationInShelfContent = CGPoint(
@@ -2937,23 +3205,61 @@
             .first(where: { $0.item.windowIndex == windowIndex })
     }
 
+    private func waterfallCard(windowID: UInt32) -> WaterfallCardLayers? {
+        waterfallColumns
+            .lazy
+            .flatMap(\.cards)
+            .first(where: { $0.item.window.id == windowID })
+    }
+
     private func layoutSpaceLaneSegmentContents(_ segment: SpaceLaneSegmentLayers) {
         let bounds = segment.containerLayer.bounds
+        let splitAppNames = splitViewAppNames(for: segment.space)
+        let isSplitView = splitAppNames.count >= 2
         segment.labelLayer.frame = CGRect(x: 10, y: bounds.height - 29, width: max(1, bounds.width - 48), height: 20)
         segment.countLayer.frame = CGRect(x: bounds.width - 34, y: bounds.height - 29, width: 24, height: 20)
+        segment.countLayer.string = isSplitView ? "" : "\(segment.space.windowCount)"
+        segment.countLayer.isHidden = isSplitView
         if segment.space.type == .fullscreen {
             let markerFrame = fullscreenMarkerFrame(in: bounds)
-            segment.appLayer.frame = CGRect(
-                x: 8,
-                y: markerFrame.midY - 8.5,
-                width: max(1, bounds.width - 16),
-                height: 17
-            )
+            segment.appLayer.isHidden = isSplitView
+            if isSplitView {
+                let labelY = markerFrame.midY - 8.5
+                let halfWidth = markerFrame.width / 2
+                for (index, splitAppLayer) in segment.splitAppLayers.enumerated() {
+                    let x = markerFrame.minX + CGFloat(index) * halfWidth
+                    splitAppLayer.isHidden = false
+                    splitAppLayer.frame = CGRect(
+                        x: x + 4,
+                        y: labelY,
+                        width: max(1, halfWidth - 8),
+                        height: 17
+                    )
+                }
+            } else {
+                segment.appLayer.frame = CGRect(
+                    x: 8,
+                    y: markerFrame.midY - 8.5,
+                    width: max(1, bounds.width - 16),
+                    height: 17
+                )
+                for splitAppLayer in segment.splitAppLayers {
+                    splitAppLayer.isHidden = true
+                }
+            }
         } else {
+            segment.appLayer.isHidden = false
             segment.appLayer.frame = CGRect(x: 10, y: 9, width: max(1, bounds.width - 20), height: 17)
+            for splitAppLayer in segment.splitAppLayers {
+                splitAppLayer.isHidden = true
+            }
         }
         if let fullscreenMarkerLayer = segment.fullscreenMarkerLayer {
-            layoutFullscreenMarkerLayer(fullscreenMarkerLayer, in: bounds)
+            layoutFullscreenMarkerLayer(
+                fullscreenMarkerLayer,
+                in: bounds,
+                isSplitView: isSplitView
+            )
         }
 
         let blockGap: CGFloat = 5
@@ -3143,6 +3449,14 @@
                 .cards
                 .compactMap(\.item.primarySpaceID) ?? []
         )
+    }
+
+    private var appIconHoverLinkedAppGroupIndex: Int? {
+        if let debugHoveredAppGroupIndex {
+            return debugHoveredAppGroupIndex
+        }
+        guard case .app(let appGroupIndex) = hoverTarget else { return nil }
+        return appGroupIndex
     }
 
     private var appHoverAssociatedSpaceLabels: [String] {
@@ -3406,14 +3720,14 @@
             1,
             Int(
                 floor(
-                    (availableWidth + HorizontalMasonryMetrics.cardGap)
-                        / (HorizontalMasonryMetrics.cardMinWidth + HorizontalMasonryMetrics.cardGap)
+                    (availableWidth + HorizontalMasonryMetrics.horizontalGap)
+                        / (HorizontalMasonryMetrics.cardMinWidth + HorizontalMasonryMetrics.horizontalGap)
                 )
             )
         )
         let laneCount = min(maximumLaneCount, max(1, cards.count))
         let fittingWidth = (
-            availableWidth - CGFloat(max(0, laneCount - 1)) * HorizontalMasonryMetrics.cardGap
+            availableWidth - CGFloat(max(0, laneCount - 1)) * HorizontalMasonryMetrics.horizontalGap
         ) / CGFloat(laneCount)
         let cardWidth = floor(
             min(
@@ -3422,7 +3736,7 @@
             )
         )
         let usedWidth = CGFloat(laneCount) * cardWidth
-            + CGFloat(max(0, laneCount - 1)) * HorizontalMasonryMetrics.cardGap
+            + CGFloat(max(0, laneCount - 1)) * HorizontalMasonryMetrics.horizontalGap
         let startX = max(
             HorizontalMasonryMetrics.horizontalPadding,
             (viewportWidth - usedWidth) / 2
@@ -3438,12 +3752,8 @@
                 }
                 return lhs.offset < rhs.offset
             }?.offset ?? 0
-            let cardHeight = horizontalMasonryCardHeight(
-                for: card,
-                width: cardWidth,
-                viewportHeight: waterfallLayer.bounds.height
-            )
-            let x = startX + CGFloat(laneIndex) * (cardWidth + HorizontalMasonryMetrics.cardGap)
+            let cardHeight = HorizontalMasonryMetrics.cardHeight
+            let x = startX + CGFloat(laneIndex) * (cardWidth + HorizontalMasonryMetrics.horizontalGap)
             let top = HorizontalMasonryMetrics.verticalPadding + laneHeights[laneIndex]
             plannedFrames.append((
                 windowID: card.item.window.id,
@@ -3452,11 +3762,11 @@
                 width: cardWidth,
                 height: cardHeight
             ))
-            laneHeights[laneIndex] += cardHeight + HorizontalMasonryMetrics.cardGap
+            laneHeights[laneIndex] += cardHeight + HorizontalMasonryMetrics.verticalGap
         }
 
         let tallestLane = laneHeights.max().map {
-            max(0, $0 - HorizontalMasonryMetrics.cardGap)
+            max(0, $0 - HorizontalMasonryMetrics.verticalGap)
         } ?? 0
         let contentHeight = max(
             waterfallLayer.bounds.height,
@@ -3477,43 +3787,6 @@
         )
 
         return HorizontalMasonryLayout(contentHeight: contentHeight, cardFramesByWindowID: frames)
-    }
-
-    private func horizontalMasonryCardHeight(
-        for card: WaterfallCardLayers,
-        width: CGFloat,
-        viewportHeight: CGFloat
-    ) -> CGFloat {
-        let thumbnailHeight = min(
-            max(
-                HorizontalMasonryMetrics.minThumbnailHeight,
-                width / horizontalMasonryThumbnailAspectRatio(for: card)
-            ),
-            max(1, viewportHeight * HorizontalMasonryMetrics.maxThumbnailHeightFraction)
-        )
-        return HorizontalMasonryMetrics.titleBarHeight
-            + HorizontalMasonryMetrics.titleGap
-            + thumbnailHeight
-    }
-
-    private func horizontalMasonryThumbnailAspectRatio(for card: WaterfallCardLayers) -> CGFloat {
-        if card.item.window.isFullscreen {
-            return 16.0 / 9.0
-        }
-        if card.item.window.isMinimized {
-            return 4.0 / 3.0
-        }
-
-        switch Int(card.item.window.id % 4) {
-        case 0:
-            return 16.0 / 9.0
-        case 1:
-            return 3.0 / 2.0
-        case 2:
-            return 4.0 / 3.0
-        default:
-            return 5.0 / 4.0
-        }
     }
 
     private func horizontalMasonryContentFrame() -> CGRect {
@@ -3613,10 +3886,13 @@
         let bounds = card.containerLayer.bounds
         let isSelected = card.item.window.id == effectiveSelection?.windowID
         let isHovered = card.item.window.id == hoveredWindowID
+        let isAppLinked = isHorizontalMasonryMode
+            && card.item.appGroupIndex == appIconHoverLinkedAppGroupIndex
         applyWaterfallCardVisualState(
             card,
             selected: shouldShowSelectedVisual(isSelected: isSelected, isHovered: isHovered),
-            hovered: isHovered
+            hovered: isHovered,
+            appLinked: isAppLinked
         )
 
         let outerInset: CGFloat = 0
@@ -3679,12 +3955,19 @@
         )
     }
 
-    private func applyWaterfallCardVisualState(_ card: WaterfallCardLayers, selected: Bool, hovered: Bool) {
+    private func applyWaterfallCardVisualState(
+        _ card: WaterfallCardLayers,
+        selected: Bool,
+        hovered: Bool,
+        appLinked: Bool
+    ) {
         let isSpaceFocused = isWaterfallCardSpaceFocused(card)
         card.containerLayer.backgroundColor = (selected
             ? NSColor.windowBackgroundColor.withAlphaComponent(0.94)
             : hovered
                 ? accentTintedWindowBackground(fraction: 0.09, alpha: 0.95)
+                : appLinked
+                    ? accentTintedWindowBackground(fraction: 0.08, alpha: 0.93)
                 : isSpaceFocused
                     ? accentTintedWindowBackground(fraction: 0.10, alpha: 0.94)
                 : NSColor.windowBackgroundColor.withAlphaComponent(0.82)
@@ -3693,27 +3976,31 @@
             ? NSColor.controlAccentColor.withAlphaComponent(0.52)
             : hovered
                 ? NSColor.controlAccentColor.withAlphaComponent(0.44)
+                : appLinked
+                    ? NSColor.controlAccentColor.withAlphaComponent(0.38)
                 : isSpaceFocused
                     ? NSColor.controlAccentColor.withAlphaComponent(0.42)
                 : NSColor.separatorColor.withAlphaComponent(0.28)
         ).cgColor
-        card.containerLayer.borderWidth = (selected || hovered || isSpaceFocused) ? 1.5 : 1
+        card.containerLayer.borderWidth = (selected || hovered || appLinked || isSpaceFocused) ? 1.5 : 1
         card.containerLayer.shadowColor = NSColor.black.cgColor
-        card.containerLayer.shadowOpacity = selected ? 0.24 : hovered ? 0.14 : isSpaceFocused ? 0.20 : 0
-        card.containerLayer.shadowRadius = selected ? 22 : hovered ? 17 : isSpaceFocused ? 24 : 0
+        card.containerLayer.shadowOpacity = selected ? 0.24 : hovered ? 0.14 : appLinked ? 0.16 : isSpaceFocused ? 0.20 : 0
+        card.containerLayer.shadowRadius = selected ? 22 : hovered ? 17 : appLinked ? 18 : isSpaceFocused ? 24 : 0
         card.containerLayer.shadowOffset = selected
             ? CGSize(width: 0, height: -6)
             : hovered
                 ? CGSize(width: 0, height: -2.5)
+                : appLinked
+                    ? CGSize(width: 0, height: -3)
                 : isSpaceFocused
                     ? CGSize(width: 0, height: -5)
                     : .zero
-        card.containerLayer.zPosition = selected ? 20 : hovered ? 10 : isSpaceFocused ? 8 : 0
+        card.containerLayer.zPosition = selected ? 20 : hovered ? 12 : appLinked ? 10 : isSpaceFocused ? 8 : 0
         let focusedScale: CGFloat = selected ? 1.015 : isSpaceFocused ? 1.012 : 1.008
         card.containerLayer.transform = (selected || hovered || isSpaceFocused)
             ? CATransform3DMakeScale(focusedScale, focusedScale, 1)
             : CATransform3DIdentity
-        card.containerLayer.shadowPath = (selected || hovered || isSpaceFocused)
+        card.containerLayer.shadowPath = (selected || hovered || appLinked || isSpaceFocused)
             ? CGPath(
                 roundedRect: card.containerLayer.bounds,
                 cornerWidth: card.containerLayer.cornerRadius,
@@ -3721,7 +4008,9 @@
                 transform: nil
             )
             : nil
-        card.titleBarLayer.backgroundColor = NSColor.clear.cgColor
+        card.titleBarLayer.backgroundColor = appLinked
+            ? spaceLaneOccupiedColor.withAlphaComponent(0.18).cgColor
+            : NSColor.clear.cgColor
         card.titleBarLayer.borderColor = NSColor.clear.cgColor
         card.titleBarLayer.borderWidth = 0
         card.shineLayer.opacity = selected ? 1 : 0
@@ -4270,6 +4559,28 @@
         waterfallViewMode == .horizontalMasonry
     }
 
+    private var nextWaterfallViewMode: QuickSwitchWaterfallViewMode {
+        isHorizontalMasonryMode ? .verticalColumns : .horizontalMasonry
+    }
+
+    private var viewModeToggleIconKind: String {
+        switch nextWaterfallViewMode {
+        case .verticalColumns:
+            return "verticalColumnsTarget"
+        case .horizontalMasonry:
+            return "horizontalMasonryTarget"
+        }
+    }
+
+    private var viewModeToggleAccessibilityLabel: String {
+        switch nextWaterfallViewMode {
+        case .verticalColumns:
+            return "切换到纵栏瀑布"
+        case .horizontalMasonry:
+            return "切换到横栏瀑布"
+        }
+    }
+
     private var waterfallMaxScrollOffset: CGFloat {
         guard !isHorizontalMasonryMode else { return 0 }
         return max(0, waterfallContentWidth - waterfallLayer.bounds.width)
@@ -4336,6 +4647,14 @@
         }
 
         return NSColor(calibratedRed: 0, green: 122 / 255, blue: 1, alpha: 1)
+    }
+
+    private var spaceLaneLockedFillColor: NSColor {
+        if effectiveAppearance.bestMatch(from: [.darkAqua, .aqua]) == .darkAqua {
+            return NSColor(calibratedRed: 58 / 255, green: 148 / 255, blue: 1, alpha: 0.86)
+        }
+
+        return NSColor(calibratedRed: 90 / 255, green: 171 / 255, blue: 1, alpha: 0.82)
     }
 
     private func spaceLaneIdleOccupiedGradientColors() -> [NSColor] {
@@ -4558,13 +4877,38 @@
         return identifiers.joined(separator: " ")
     }
 
-    private func layoutFullscreenMarkerLayer(_ layer: CALayer, in segmentBounds: CGRect) {
+    private func splitViewAppNames(for space: QuickSwitchSpaceViewModel) -> [String] {
+        guard space.type == .fullscreen else { return [] }
+
+        let names = space.splitViewAppNames
+            .prefix(2)
+            .map { $0.trimmingCharacters(in: .whitespacesAndNewlines) }
+            .filter { !$0.isEmpty }
+
+        guard names.count >= 2 else { return [] }
+        return names
+    }
+
+    private func layoutFullscreenMarkerLayer(
+        _ layer: CALayer,
+        in segmentBounds: CGRect,
+        isSplitView: Bool = false
+    ) {
         let markerFrame = fullscreenMarkerFrame(in: segmentBounds)
         layer.frame = markerFrame
 
         guard let shapeLayer = layer as? CAShapeLayer else { return }
 
         let bounds = shapeLayer.bounds
+        if isSplitView {
+            let path = CGMutablePath()
+            path.move(to: CGPoint(x: bounds.midX, y: bounds.minY))
+            path.addLine(to: CGPoint(x: bounds.midX, y: bounds.maxY))
+            shapeLayer.path = path
+            shapeLayer.lineCap = .butt
+            return
+        }
+
         let cornerLength = min(12, max(7, min(bounds.width, bounds.height) * 0.28))
         let path = CGMutablePath()
 
@@ -4585,6 +4929,7 @@
         path.addLine(to: CGPoint(x: 0, y: bounds.maxY - cornerLength))
 
         shapeLayer.path = path
+        shapeLayer.lineCap = .round
     }
 
     private func fullscreenMarkerFrame(in segmentBounds: CGRect) -> CGRect {
@@ -4799,6 +5144,7 @@
                 "shadowRadius": Double(card.containerLayer.shadowRadius),
                 "thumbnailFrame": dictionary(from: card.thumbnailLayer.frame),
                 "titleBarFrame": dictionary(from: card.titleBarLayer.frame),
+                "titleBarBackgroundColor": colorDictionary(from: card.titleBarLayer.backgroundColor),
                 "titleBarBorderWidth": Double(card.titleBarLayer.borderWidth),
                 "titleFrame": dictionary(from: card.titleLayer.frame),
                 "metaFrame": dictionary(from: card.metaLayer.frame),
@@ -4906,6 +5252,8 @@
         var states: [String] = []
         let isSelected = card.item.window.id == effectiveSelection?.windowID
         let isHovered = card.item.window.id == hoveredWindowID
+        let isAppLinked = isHorizontalMasonryMode
+            && card.item.appGroupIndex == appIconHoverLinkedAppGroupIndex
         if shouldShowSelectedVisual(isSelected: isSelected, isHovered: isHovered) {
             states.append("selected")
         } else if isSelected {
@@ -4913,6 +5261,9 @@
         }
         if isHovered {
             states.append("hover")
+        }
+        if isAppLinked {
+            states.append("appLinked")
         }
         if isWaterfallCardSpaceFocused(card) {
             states.append("spaceFocused")
@@ -4973,6 +5324,8 @@
                 let fullscreenMarkerCenterRatio = fullscreenMarkerFrame.map {
                     Double($0.midY / max(1, segment.containerLayer.bounds.height))
                 }
+                let splitAppNames = splitViewAppNames(for: space)
+                let splitAppLabelFrames = segment.splitAppLayers.map { dictionary(from: $0.frame) }
                 return [
                     "displayUUID": display.displayUUID,
                     "displayLabel": display.displayLabel,
@@ -4981,12 +5334,32 @@
                     "type": spaceTypeName(space.type),
                     "visualStates": visualStates(for: space),
                     "fullscreenMarkerVisible": segment.fullscreenMarkerLayer != nil,
-                    "fullscreenMarkerKind": segment.fullscreenMarkerLayer == nil ? "none" : "cornerBracket",
+                    "fullscreenMarkerKind": fullscreenMarkerKind(
+                        markerLayer: segment.fullscreenMarkerLayer,
+                        splitAppNames: splitAppNames
+                    ),
+                    "fullscreenMarkerPathStyle": fullscreenMarkerPathStyle(
+                        markerLayer: segment.fullscreenMarkerLayer,
+                        splitAppNames: splitAppNames
+                    ),
                     "fullscreenMarkerFrame": fullscreenMarkerFrame.map { dictionary(from: $0) } ?? NSNull(),
                     "fullscreenMarkerCenterRatio": fullscreenMarkerCenterRatio ?? NSNull(),
+                    "splitViewAppNames": splitAppNames,
+                    "splitViewLabelFrames": splitAppLabelFrames,
+                    "splitViewLabelColors": segment.splitAppLayers.map {
+                        colorDictionary(from: $0.foregroundColor)
+                    },
                     "windowBlockCount": segment.windowBlocks.count,
                     "windowBlockColors": segment.windowBlocks.map { colorDictionary(from: $0.backgroundColor) },
                     "windowBlockFrames": segment.windowBlocks.map { dictionary(from: $0.frame) },
+                    "labelColor": colorDictionary(from: segment.labelLayer.foregroundColor),
+                    "countText": string(from: segment.countLayer.string),
+                    "countVisible": !segment.countLayer.isHidden && segment.countLayer.opacity > 0,
+                    "countColor": colorDictionary(from: segment.countLayer.foregroundColor),
+                    "appColor": colorDictionary(from: segment.appLayer.foregroundColor),
+                    "fullscreenMarkerStrokeColor": colorDictionary(
+                        from: (segment.fullscreenMarkerLayer as? CAShapeLayer)?.strokeColor
+                    ),
                     "backgroundKind": spaceLaneFillKind(for: segment.containerLayer),
                     "backgroundColor": colorDictionary(from: segment.containerLayer.backgroundColor),
                     "gradientColors": gradientColorDictionaries(from: segment.containerLayer),
@@ -5021,6 +5394,16 @@
         }
     }
 
+    private func fullscreenMarkerKind(markerLayer: CALayer?, splitAppNames: [String]) -> String {
+        guard markerLayer != nil else { return "none" }
+        return splitAppNames.count >= 2 ? "splitViewPair" : "cornerBracket"
+    }
+
+    private func fullscreenMarkerPathStyle(markerLayer: CALayer?, splitAppNames: [String]) -> String {
+        guard markerLayer != nil else { return "none" }
+        return splitAppNames.count >= 2 ? "centerDividerOnly" : "cornerBracket"
+    }
+
     private func visualStates(for space: QuickSwitchSpaceViewModel) -> [String] {
         var states: [String] = []
         if space.isCurrent {
@@ -5043,6 +5426,9 @@
         }
         if space.type == .fullscreen {
             states.append("fullscreen")
+        }
+        if splitViewAppNames(for: space).count >= 2 {
+            states.append("splitView")
         }
         return states
     }
@@ -5069,6 +5455,16 @@
         ]
     }
 
+    private func string(from textLayerValue: Any?) -> String {
+        if let string = textLayerValue as? String {
+            return string
+        }
+        if let attributedString = textLayerValue as? NSAttributedString {
+            return attributedString.string
+        }
+        return ""
+    }
+
     private func colorDictionary(from color: CGColor?) -> [String: Double] {
         guard let color,
               let nsColor = NSColor(cgColor: color)?.usingColorSpace(.deviceRGB)

--
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