From 1a7643b2e7e8f9712533e5a68536ee3b23b0804b Mon Sep 17 00:00:00 2001
From: Ariver <ar@MacBook-Air.local>
Date: Mon, 11 May 2026 11:51:02 +0800
Subject: [PATCH] Implement CALayer drag preview for 5.2.0

---
 Apptag/ContentView.swift |  766 ++++++++++++++++++++++++++++++++++++++++++++++++++++------
 1 files changed, 680 insertions(+), 86 deletions(-)

diff --git a/Apptag/ContentView.swift b/Apptag/ContentView.swift
index c399bac..b8833eb 100644
--- a/Apptag/ContentView.swift
+++ b/Apptag/ContentView.swift
@@ -1,11 +1,11 @@
 import SwiftUI
 import AppKit
+import UniformTypeIdentifiers
 
 // MARK: - Notification for manual re-index
 
 extension Notification.Name {
-    static let apptagReindex = Notification.Name("ApptagReindex")
-    static let apptagEditModeChanged = Notification.Name("ApptagEditModeChanged")
+    static let tagLauncherEditModeChanged = Notification.Name("TagLauncherEditModeChanged")
 }
 
 // MARK: - Edit Phase
@@ -203,6 +203,12 @@
     @State private var selectedTagNames: Set<String> = []
     @State private var successToast: String? = nil
     @State private var draggedTagNames: [String] = []  // live drag order
+    @State private var dragItem: String? = nil          // currently dragged tag
+    @State private var hoveredContainer: String? = nil  // colored container lift
+    // Fixed interaction for "Colorless Container": hover fills persistently; click clears.
+    @State private var filledColorlessContainer: String? = nil
+    @State private var appDragModeActive = false
+    @State private var dropWarningToast: String? = nil
 
     // Configurable defaults
     @AppStorage("defaultGroupName") private var defaultGroupName = "Other"
@@ -210,9 +216,19 @@
     @AppStorage("iconSize") private var iconSize: Double = 56
     @AppStorage("tagPosition") private var tagPosition = "left"
     @State private var notchHeight: CGFloat = 0
+    @AppStorage("displayMode") private var displayMode = "flat"
+    @AppStorage("hideAppNames") private var hideAppNames = false
 
     private var isSideLayout: Bool {
         tagPosition == "left" || tagPosition == "right"
+    }
+
+    private var isColorlessContainerMode: Bool {
+        displayMode == "container" || displayMode == "gridContainer"
+    }
+
+    private var isColoredContainerMode: Bool {
+        displayMode == "coloredContainer" || displayMode == "coloredGridContainer"
     }
 
     var body: some View {
@@ -239,6 +255,21 @@
             case .editingApps:
                 editAppsView
             }
+
+            if let message = dropWarningToast {
+                Text(message)
+                    .font(.system(size: 16, weight: .semibold))
+                    .foregroundStyle(.primary)
+                    .padding(.horizontal, 22)
+                    .padding(.vertical, 12)
+                    .background(
+                        RoundedRectangle(cornerRadius: 10)
+                            .fill(.ultraThickMaterial)
+                            .shadow(color: .black.opacity(0.22), radius: 18, y: 10)
+                    )
+                    .transition(.scale(scale: 0.96).combined(with: .opacity))
+                    .allowsHitTesting(false)
+            }
         }
         .onAppear {
             let mousePoint = NSEvent.mouseLocation
@@ -251,13 +282,10 @@
         .onReceive(NotificationCenter.default.publisher(for: NSApplication.didBecomeActiveNotification)) { _ in
             refreshApps()
         }
-        .onReceive(NotificationCenter.default.publisher(for: .apptagReindex)) { _ in
-            refreshApps()
-        }
         .onChange(of: editPhase) { _, newPhase in
             let active = newPhase != .none
             NotificationCenter.default.post(
-                name: .apptagEditModeChanged,
+                name: .tagLauncherEditModeChanged,
                 object: nil,
                 userInfo: ["active": active]
             )
@@ -267,17 +295,17 @@
     /// Set edit phase with synchronous notification BEFORE state change.
     func setEditPhase(_ phase: EditPhase) {
         if phase != .none {
-            NotificationCenter.default.post(name: .apptagEditModeChanged, object: nil, userInfo: ["active": true])
+            NotificationCenter.default.post(name: .tagLauncherEditModeChanged, object: nil, userInfo: ["active": true])
             NSApp.activate(ignoringOtherApps: true)
-            // Sync drag order from database when entering edit mode
-            if draggedTagNames.isEmpty {
-                draggedTagNames = TagEditor.orderedTagNames()
-            }
+            // Always sync tag list from database when entering edit mode
+            let store = TagDatabase.load()
+            tagColors = store.tags.mapValues { $0.color }
+            draggedTagNames = TagEditor.orderedTagNames()
         }
         editPhase = phase
         if phase == .none {
             DispatchQueue.main.async {
-                NotificationCenter.default.post(name: .apptagEditModeChanged, object: nil, userInfo: ["active": false])
+                NotificationCenter.default.post(name: .tagLauncherEditModeChanged, object: nil, userInfo: ["active": false])
             }
         }
     }
@@ -336,7 +364,18 @@
             HStack(spacing: 8) {
                 ForEach(tagLabels) { tag in
                     TagPill(name: tag.name, colorIndex: tag.colorIndex,
-                            action: { scrollTo(tag.id) })
+                            action: {
+                        if isColorlessContainerMode {
+                            toggleColorlessFill(tag.id)
+                        }
+                        scrollTo(tag.id)
+                    })
+                    .onHover { hovering in
+                        if hovering {
+                            fillColorlessContainer(tag.id)
+                            scrollTo(tag.id)
+                        }
+                    }
                 }
             }.padding(.horizontal, 24)
         }
@@ -347,7 +386,18 @@
             VStack(spacing: 6) {
                 ForEach(tagLabels) { tag in
                     SideTagPill(name: tag.name, colorIndex: tag.colorIndex,
-                                action: { scrollTo(tag.id) })
+                                action: {
+                        if isColorlessContainerMode {
+                            toggleColorlessFill(tag.id)
+                        }
+                        scrollTo(tag.id)
+                    })
+                    .onHover { hovering in
+                        if hovering {
+                            fillColorlessContainer(tag.id)
+                            scrollTo(tag.id)
+                        }
+                    }
                 }
             }.padding(12)
         }.frame(width: 135)
@@ -363,22 +413,434 @@
                 Spacer()
                 ProgressView().scaleEffect(0.8)
                 Spacer()
+            } else if displayMode == "gridContainer" || displayMode == "coloredGridContainer" {
+                gridContainerGrid
+            } else if displayMode == "container" || displayMode == "coloredContainer" {
+                containerGrid
             } else {
-                ScrollViewReader { proxy in
-                    ScrollView {
-                        LazyVStack(alignment: .leading, spacing: 24) {
-                            ForEach(groups) { group in
-                                TagGroupView(
-                                    group: group,
-                                    onSelectApp: { app in openApp(app) },
-                                    tagFontSize: tagFontSize,
-                                    iconSize: iconSize
-                                ).id(group.id)
+                flatGrid
+            }
+        }
+    }
+
+    private var flatGrid: some View {
+        ScrollViewReader { proxy in
+            ScrollView {
+                LazyVStack(alignment: .leading, spacing: 24) {
+                    ForEach(groups) { group in
+                        TagGroupView(
+                            group: group,
+                            onSelectApp: { app in openApp(app) },
+                            tagFontSize: tagFontSize,
+                            iconSize: iconSize,
+                            showNames: !hideAppNames,
+                            dragModeActive: appDragModeActive,
+                            onDragModeChange: { setAppDragMode($0) },
+                            onDropApp: { path, source, copy in
+                                dropApp(path: path, sourceTag: source, targetTag: group.name, copy: copy)
                             }
-                        }.padding(20)
-                    }.onAppear { scrollProxy = proxy }
+                        ).id(group.id)
+                    }
+                }.padding(20)
+            }
+            .id(displayMode)  // force rebuild on mode switch
+            .onAppear { scrollProxy = proxy }
+        }
+    }
+
+    private var containerGrid: some View {
+        GeometryReader { geo in
+            let outerPad: CGFloat = 20
+            let gap: CGFloat = 16
+            let available = geo.size.width - outerPad * 2
+            let colW: CGFloat = 280
+            let colCount = max(1, Int((available + gap) / (colW + gap)))
+            let actualColW = (available - gap * CGFloat(colCount - 1)) / CGFloat(colCount)
+
+            let columns = distributeToColumns(groups: groups, colCount: colCount, colWidth: actualColW)
+
+            ScrollViewReader { proxy in
+                ScrollView {
+                    HStack(alignment: .top, spacing: gap) {
+                        ForEach(0..<colCount, id: \.self) { ci in
+                            LazyVStack(spacing: gap) {
+                                ForEach(columns[ci]) { group in
+                                    masonryCard(group, width: actualColW)
+                                        .id(group.id)
+                                }
+                            }
+                        }
+                    }
+                    .padding(outerPad)
+                }
+                .id(displayMode)  // force rebuild on mode switch
+                .onAppear { scrollProxy = proxy }
+            }
+        }
+    }
+
+    /// Distribute groups to the shortest column.
+    private func distributeToColumns(groups: [TagGroup], colCount: Int, colWidth: CGFloat) -> [[TagGroup]] {
+        var cols = Array(repeating: [TagGroup](), count: colCount)
+        var h = Array(repeating: CGFloat(0), count: colCount)
+        for g in groups {
+            let est = estimatedCardHeight(g, width: colWidth)
+            let ci = h.firstIndex(of: h.min()!)!
+            cols[ci].append(g)
+            h[ci] += est + 16
+        }
+        return cols
+    }
+
+    private func estimatedCardHeight(_ group: TagGroup, width: CGFloat) -> CGFloat {
+        let inner = width - 32
+        let itemW = iconSize + 28 + 6
+        let perRow = max(1, Int(inner / itemW))
+        let rows = (group.apps.count + perRow - 1) / perRow
+        return 32 + CGFloat(rows) * (iconSize + 30)
+    }
+
+    private func masonryCard(_ group: TagGroup, width: CGFloat) -> some View {
+        let isColored = displayMode == "coloredContainer"
+        let isColorless = isColorlessContainerMode
+        let isColorlessFilled = isColorless && filledColorlessContainer == group.name
+        let isHovered = hoveredContainer == group.name
+        let isColorlessActive = isColorless && (isColorlessFilled || isHovered)
+        let tagColor = Color(nsColor: TagColor.nsColor(for: tagColors[group.name] ?? 0))
+        return VStack(alignment: .leading, spacing: 6) {
+            HStack(spacing: 0) {
+                Rectangle().fill(.secondary.opacity(0.25)).frame(height: 1)
+                    .layoutPriority(0)
+                Text(group.name)
+                    .font(.system(size: tagFontSize, weight: .semibold))
+                    .foregroundStyle(.secondary)
+                    .lineLimit(1)
+                    .truncationMode(.middle)
+                    .padding(.horizontal, 10)
+                    .layoutPriority(1)
+                Rectangle().fill(.secondary.opacity(0.25)).frame(height: 1)
+                    .layoutPriority(0)
+            }
+            let itemSize = iconSize + 28
+            LazyVGrid(
+                columns: [GridItem(.adaptive(minimum: itemSize, maximum: itemSize + 36), spacing: 6)],
+                spacing: 2
+            ) {
+                ForEach(group.apps) { app in
+                    AppGridItem(
+                        app: app,
+                        iconSize: iconSize,
+                        showName: !hideAppNames,
+                        sourceTag: group.name,
+                        dragModeActive: appDragModeActive,
+                        onDragModeChange: { setAppDragMode($0) },
+                        onSelect: { openApp(app) }
+                    )
                 }
             }
+        }
+        .frame(maxWidth: width)
+        .padding(16)
+        .background(
+            RoundedRectangle(cornerRadius: 14)
+                .fill((isColored || isColorlessActive) ? tagColor.opacity(0.30) : Color.clear)
+                .background(
+                    RoundedRectangle(cornerRadius: 14)
+                        .fill(.ultraThinMaterial)
+                )
+        )
+        .overlay(
+            RoundedRectangle(cornerRadius: 14)
+                .stroke(Color.primary.opacity(0.08), lineWidth: 1)
+        )
+        .overlay {
+            AppDropTargetView(targetTag: group.name) { path, source, copy in
+                dropApp(path: path, sourceTag: source, targetTag: group.name, copy: copy)
+            }
+            .allowsHitTesting(false)
+        }
+        .shadow(color: .black.opacity((isColored && isHovered) || isColorlessActive ? 0.22 : 0),
+                radius: (isColored && isHovered) || isColorlessActive ? 18 : 0,
+                y: (isColored && isHovered) || isColorlessActive ? 10 : 0)
+        .scaleEffect(isColored && isHovered ? 1.015 : 1.0)
+        .animation(.spring(response: 0.25, dampingFraction: 0.82), value: isHovered)
+        .animation(.spring(response: 0.25, dampingFraction: 0.82), value: isColorlessFilled)
+        .onHover { hovering in
+            if isColored || isColorless {
+                hoveredContainer = hovering ? group.name : nil
+            }
+        }
+        .contentShape(RoundedRectangle(cornerRadius: 14))
+        .onTapGesture {
+            if isColorless {
+                toggleColorlessFill(group.name)
+            }
+        }
+        .onDrop(of: [UTType.plainText], isTargeted: nil) { providers in
+            handleAppDrop(providers, targetTag: group.name)
+        }
+    }
+
+    private var gridContainerGrid: some View {
+        GeometryReader { geo in
+            let outerPad: CGFloat = 20
+            let gap: CGFloat = 16
+            let available = geo.size.width - outerPad * 2
+            let preferredCount = preferredGridContainersPerRow(availableWidth: available)
+            let rows = gridContainerRows(groups: groups, trackCount: preferredCount, availableWidth: available, gap: gap)
+
+            ScrollViewReader { proxy in
+                ScrollView {
+                    VStack(alignment: .leading, spacing: gap) {
+                        ForEach(Array(rows.indices), id: \.self) { rowIndex in
+                            let row = rows[rowIndex]
+
+                            HStack(alignment: .top, spacing: gap) {
+                                ForEach(Array(row.items.indices), id: \.self) { itemIndex in
+                                    let item = row.items[itemIndex]
+                                    gridContainerCard(item.group, width: item.width, fixedRows: row.fixedRows)
+                                        .id(item.group.id)
+                                }
+                            }
+                        }
+                    }
+                    .padding(outerPad)
+                    .frame(maxWidth: .infinity, alignment: .topLeading)
+                }
+                .id(displayMode)
+                .onAppear { scrollProxy = proxy }
+            }
+        }
+    }
+
+    private func preferredGridContainersPerRow(availableWidth: CGFloat) -> Int {
+        let minCardWidth = max(260, iconSize * 3 + 88)
+        if availableWidth >= minCardWidth * 3 + 32 { return 3 }
+        if availableWidth >= minCardWidth * 2 + 16 { return 2 }
+        return 1
+    }
+
+    private struct GridContainerLayoutItem {
+        let group: TagGroup
+        let width: CGFloat
+    }
+
+    private struct GridContainerLayoutRow {
+        let items: [GridContainerLayoutItem]
+        let fixedRows: Int
+    }
+
+    private struct GridContainerCandidate {
+        let spans: [Int]
+        let rows: Int
+        let cost: CGFloat
+    }
+
+    private func gridContainerRows(groups: [TagGroup], trackCount: Int, availableWidth: CGFloat, gap: CGFloat) -> [GridContainerLayoutRow] {
+        let trackCount = max(1, trackCount)
+        let trackWidth = (availableWidth - gap * CGFloat(trackCount - 1)) / CGFloat(trackCount)
+        let patterns = gridContainerSpanPatterns(trackCount: trackCount)
+        let n = groups.count
+        guard n > 0 else { return [] }
+
+        var bestCost = Array(repeating: CGFloat.greatestFiniteMagnitude, count: n + 1)
+        var bestPattern = Array(repeating: [Int](), count: n)
+        bestCost[n] = 0
+
+        for index in stride(from: n - 1, through: 0, by: -1) {
+            for pattern in patterns where index + pattern.count <= n {
+                let candidate = gridContainerCandidate(
+                    groups: groups,
+                    startIndex: index,
+                    spans: pattern,
+                    trackWidth: trackWidth,
+                    availableWidth: availableWidth,
+                    gap: gap
+                )
+                let totalCost = candidate.cost + bestCost[index + pattern.count]
+                if totalCost < bestCost[index] {
+                    bestCost[index] = totalCost
+                    bestPattern[index] = candidate.spans
+                }
+            }
+        }
+
+        var rows: [GridContainerLayoutRow] = []
+        var index = 0
+        while index < n {
+            let spans = bestPattern[index].isEmpty ? [trackCount] : bestPattern[index]
+            let widths = spans.map { gridContainerWidth(trackWidth: trackWidth, span: $0, gap: gap) }
+            let fixedRows = widths.indices.map {
+                iconRows(appCount: groups[index + $0].apps.count, width: widths[$0])
+            }.max() ?? 1
+            let items = widths.indices.map {
+                GridContainerLayoutItem(group: groups[index + $0], width: widths[$0])
+            }
+            rows.append(GridContainerLayoutRow(items: items, fixedRows: fixedRows))
+            index += spans.count
+        }
+        return rows
+    }
+
+    private func gridContainerSpanPatterns(trackCount: Int) -> [[Int]] {
+        switch trackCount {
+        case 3:
+            return [[1, 1, 1], [1, 2], [2, 1], [3]]
+        case 2:
+            return [[1, 1], [2]]
+        default:
+            return [[1]]
+        }
+    }
+
+    private func gridContainerCandidate(
+        groups: [TagGroup],
+        startIndex: Int,
+        spans: [Int],
+        trackWidth: CGFloat,
+        availableWidth: CGFloat,
+        gap: CGFloat
+    ) -> GridContainerCandidate {
+        let widths = spans.map { gridContainerWidth(trackWidth: trackWidth, span: $0, gap: gap) }
+        let rowCounts = widths.indices.map {
+            iconRows(appCount: groups[startIndex + $0].apps.count, width: widths[$0])
+        }
+        let fixedRows = rowCounts.max() ?? 1
+        let rowArea = CGFloat(fixedRows) * iconCellHeight() * availableWidth
+        let paddingCost = CGFloat(spans.count) * 0.001
+        return GridContainerCandidate(spans: spans, rows: fixedRows, cost: rowArea + paddingCost)
+    }
+
+    private func gridContainerWidth(trackWidth: CGFloat, span: Int, gap: CGFloat) -> CGFloat {
+        let span = max(1, span)
+        return trackWidth * CGFloat(span) + gap * CGFloat(span - 1)
+    }
+
+    private func iconColumns(width: CGFloat) -> Int {
+        let inner = width - 32
+        let itemW = iconSize + 34
+        return max(1, Int((inner + 6) / itemW))
+    }
+
+    private func iconRows(appCount: Int, width: CGFloat) -> Int {
+        let cols = iconColumns(width: width)
+        return max(1, (appCount + cols - 1) / cols)
+    }
+
+    private func gridContainerCard(_ group: TagGroup, width: CGFloat, fixedRows: Int) -> some View {
+        let isColored = displayMode == "coloredGridContainer"
+        let isColorlessGrid = displayMode == "gridContainer"
+        let isColorless = isColorlessContainerMode
+        let isColorlessFilled = isColorless && filledColorlessContainer == group.name
+        let isHovered = hoveredContainer == group.name
+        let isColorlessGridActive = isColorlessGrid && (isColorlessFilled || isHovered)
+        let cols = iconColumns(width: width)
+        let contentWidth = max(1, width - 32)
+        let cellWidth = max(1, (contentWidth - 6 * CGFloat(cols - 1)) / CGFloat(cols))
+        let cellHeight = iconCellHeight()
+        let gridHeight = CGFloat(fixedRows) * cellHeight + CGFloat(max(0, fixedRows - 1)) * 2
+        let rows = appRows(group.apps, columns: cols, fixedRows: fixedRows)
+        let tagColor = Color(nsColor: TagColor.nsColor(for: tagColors[group.name] ?? 0))
+
+        return VStack(alignment: .leading, spacing: 6) {
+            HStack(spacing: 0) {
+                Rectangle().fill(.secondary.opacity(0.25)).frame(height: 1)
+                    .layoutPriority(0)
+                Text(group.name)
+                    .font(.system(size: tagFontSize, weight: .semibold))
+                    .foregroundStyle(.secondary)
+                    .lineLimit(1)
+                    .truncationMode(.middle)
+                    .padding(.horizontal, 10)
+                    .layoutPriority(1)
+                Rectangle().fill(.secondary.opacity(0.25)).frame(height: 1)
+                    .layoutPriority(0)
+            }
+
+            VStack(alignment: .leading, spacing: 2) {
+                ForEach(rows.indices, id: \.self) { rowIndex in
+                    HStack(alignment: .top, spacing: 6) {
+                        ForEach(rows[rowIndex]) { app in
+                            AppGridItem(
+                                app: app,
+                                iconSize: iconSize,
+                                showName: !hideAppNames,
+                                sourceTag: group.name,
+                                dragModeActive: appDragModeActive,
+                                onDragModeChange: { setAppDragMode($0) },
+                                onSelect: { openApp(app) }
+                            )
+                                .frame(width: cellWidth)
+                                .frame(height: cellHeight)
+                        }
+
+                        let emptyCells = max(0, cols - rows[rowIndex].count)
+                        ForEach(0..<emptyCells, id: \.self) { _ in
+                            Color.clear
+                                .frame(width: cellWidth, height: cellHeight)
+                        }
+                    }
+                    .frame(height: cellHeight)
+                }
+            }
+            .frame(height: gridHeight, alignment: .topLeading)
+        }
+        .frame(width: contentWidth)
+        .padding(16)
+        .background(
+            RoundedRectangle(cornerRadius: 14)
+                .fill((isColored || isColorlessGridActive) ? tagColor.opacity(0.30) : Color.clear)
+                .background(
+                    RoundedRectangle(cornerRadius: 14)
+                        .fill(.ultraThinMaterial)
+                )
+        )
+        .overlay(
+            RoundedRectangle(cornerRadius: 14)
+                .stroke(Color.primary.opacity(0.08), lineWidth: 1)
+        )
+        .overlay {
+            AppDropTargetView(targetTag: group.name) { path, source, copy in
+                dropApp(path: path, sourceTag: source, targetTag: group.name, copy: copy)
+            }
+            .allowsHitTesting(false)
+        }
+        .shadow(color: .black.opacity((isColored && isHovered) || isColorlessGridActive ? 0.22 : 0),
+                radius: (isColored && isHovered) || isColorlessGridActive ? 18 : 0,
+                y: (isColored && isHovered) || isColorlessGridActive ? 10 : 0)
+        .scaleEffect(isColored && isHovered ? 1.015 : 1.0)
+        .animation(.spring(response: 0.25, dampingFraction: 0.82), value: isHovered)
+        .animation(.spring(response: 0.25, dampingFraction: 0.82), value: isColorlessFilled)
+        .onHover { hovering in
+            if isColored || isColorlessGrid {
+                hoveredContainer = hovering ? group.name : nil
+            } else if hovering {
+                fillColorlessContainer(group.name)
+            }
+        }
+        .contentShape(RoundedRectangle(cornerRadius: 14))
+        .onTapGesture {
+            if isColorlessGrid {
+                toggleColorlessFill(group.name)
+            }
+        }
+        .onDrop(of: [UTType.plainText], isTargeted: nil) { providers in
+            handleAppDrop(providers, targetTag: group.name)
+        }
+    }
+
+    private func iconCellHeight() -> CGFloat {
+        iconSize + (hideAppNames ? 16 : 42)
+    }
+
+    private func appRows(_ apps: [AppInfo], columns: Int, fixedRows: Int) -> [[AppInfo]] {
+        let columns = max(1, columns)
+        let rowCount = max(1, fixedRows)
+        return (0..<rowCount).map { rowIndex in
+            let start = rowIndex * columns
+            guard start < apps.count else { return [] }
+            let end = min(start + columns, apps.count)
+            return Array(apps[start..<end])
         }
     }
 
@@ -390,12 +852,12 @@
                 Button {
                     setEditPhase(.none)
                 } label: {
-                    Label("Exit editing", systemImage: "rectangle.portrait.and.arrow.right")
+                    Label(tr("edit.exit"), systemImage: "rectangle.portrait.and.arrow.right")
                         .font(.system(size: 12))
                 }
                 .buttonStyle(.bordered)
                 Spacer()
-                Text("Edit Tags").font(.headline)
+                Text(tr("edit.tags")).font(.headline)
                 Spacer()
             }
             .padding(.horizontal, 24)
@@ -418,14 +880,14 @@
         VStack(spacing: 0) {
             HStack {
                 Button { cancelEditApps(); setEditPhase(.none) } label: {
-                    Label("Exit editing", systemImage: "rectangle.portrait.and.arrow.right")
+                    Label(tr("edit.exit"), systemImage: "rectangle.portrait.and.arrow.right")
                         .font(.system(size: 12))
                 }
                 .buttonStyle(.bordered)
                 Spacer()
-                Text("Edit App Categories").font(.headline)
+                Text(tr("edit.title")).font(.headline)
                 Spacer()
-                Button("Confirm") { confirmAssign() }
+                Button(tr("edit.confirm")) { confirmAssign() }
                     .buttonStyle(.borderedProminent)
                     .disabled(selectedAppPaths.isEmpty || selectedTagNames.isEmpty)
             }
@@ -437,47 +899,40 @@
 
             HStack(spacing: 0) {
                 VStack(alignment: .leading, spacing: 4) {
-                    Text("Select tags:").font(.caption).foregroundStyle(.secondary).padding(.bottom, 4)
-                    List {
-                        ForEach(sortedTagNames, id: \.self) { tagName in
-                            selectableTagItem(tagName)
-                        }
-                        .onMove { from, to in
-                            var names = sortedTagNames
-                            names.move(fromOffsets: from, toOffset: to)
-                            // Persist the new order
-                            let fullOrder = TagEditor.orderedTagNames()
-                            let otherTags = fullOrder.filter { !names.contains($0) }
-                            draggedTagNames = names + otherTags
-                            TagEditor.reorderTags(draggedTagNames)
-                        }
-                    }
-                    .listStyle(.plain)
-                    .scrollContentBackground(.hidden)
-                    .frame(width: 170)
+                    Text(tr("edit.selectTags")).font(.caption).foregroundStyle(.secondary).padding(.bottom, 4)
+                    Text(tr("edit.dragHint")).font(.caption2).foregroundStyle(.tertiary).padding(.bottom, 2)
+                    ScrollView(.vertical, showsIndicators: false) {
+                        VStack(spacing: 4) {
+                            ForEach(sortedTagNames, id: \.self) { tagName in
+                                selectableTagItem(tagName)
+                                    .onDrag {
+                                        dragItem = tagName
+                                        return NSItemProvider(object: tagName as NSString)
+                                    }
+                                    .onDrop(of: [.text], isTargeted: nil) { providers, _ in
+                                        guard let fromName = dragItem,
+                                              var names = draggedTagNames as [String]?,
+                                              let fromIdx = names.firstIndex(of: fromName),
+                                              let toIdx = names.firstIndex(of: tagName),
+                                              fromIdx != toIdx
+                                        else { return false }
+                                        let toOffset = toIdx > fromIdx ? toIdx + 1 : toIdx
+                                        names.move(fromOffsets: [fromIdx], toOffset: toOffset)
+                                        draggedTagNames = names
+                                        TagEditor.reorderTags(names)
+                                        dragItem = nil
+                                        return true
+                                    }
+                            }
+                        }.padding(12)
+                    }.frame(width: 155)
                 }
                 Rectangle().fill(.secondary.opacity(0.12)).frame(width: 1)
 
                 if allApps.isEmpty {
                     Spacer(); ProgressView().scaleEffect(0.8); Spacer()
                 } else {
-                    ScrollView {
-                        LazyVStack(alignment: .leading, spacing: 24) {
-                            ForEach(groups) { group in
-                                VStack(alignment: .leading, spacing: 6) {
-                                    HStack(spacing: 0) {
-                                        Rectangle().fill(.secondary.opacity(0.25)).frame(height: 1)
-                                        Text(group.name).font(.system(size: tagFontSize, weight: .semibold))
-                                            .foregroundStyle(.secondary).padding(.horizontal, 10)
-                                        Rectangle().fill(.secondary.opacity(0.25)).frame(height: 1)
-                                    }
-                                    LazyVGrid(columns: [GridItem(.adaptive(minimum: iconSize + 28, maximum: iconSize + 64), spacing: 6)], spacing: 2) {
-                                        ForEach(group.apps) { app in editableAppItem(app) }
-                                    }
-                                }
-                            }
-                        }.padding(20)
-                    }
+                    editAppsGrid
                 }
             }
 
@@ -495,24 +950,55 @@
         }
     }
 
+    private var editAppsGrid: some View {
+        ScrollView {
+            LazyVStack(alignment: .leading, spacing: 24) {
+                ForEach(groups) { group in
+                    editFlatGroup(group)
+                }
+            }
+            .padding(20)
+        }
+    }
+
+    private func editFlatGroup(_ group: TagGroup) -> some View {
+        VStack(alignment: .leading, spacing: 0) {
+            HStack(spacing: 0) {
+                Rectangle().fill(.secondary.opacity(0.25)).frame(height: 1)
+                Text(group.name)
+                    .font(.system(size: tagFontSize, weight: .semibold))
+                    .foregroundStyle(.secondary)
+                    .padding(.horizontal, 10)
+                Rectangle().fill(.secondary.opacity(0.25)).frame(height: 1)
+            }
+            .padding(.bottom, 6)
+
+            LazyVGrid(
+                columns: [GridItem(.adaptive(minimum: iconSize + 28, maximum: iconSize + 64), spacing: 6)],
+                spacing: 2
+            ) {
+                ForEach(group.apps) { app in editableAppItem(app) }
+            }
+        }
+    }
+
     private func selectableTagItem(_ tagName: String) -> some View {
         let isSelected = selectedTagNames.contains(tagName)
-        return Button {
-            if isSelected { selectedTagNames.remove(tagName) } else { selectedTagNames.insert(tagName) }
-        } label: {
-            HStack(spacing: 6) {
-                Circle()
-                    .fill(isSelected ? Color.accentColor : Color.secondary.opacity(0.3))
-                    .frame(width: 16, height: 16)
-                    .overlay(isSelected ? Image(systemName: "checkmark").font(.system(size: 8, weight: .bold)).foregroundStyle(.white) : nil)
-                Text(tagName).font(.system(size: 13, weight: .medium)).foregroundStyle(.primary)
-            }
-            .padding(.horizontal, 10).padding(.vertical, 5)
-            .frame(maxWidth: .infinity, alignment: .leading)
-            .background(RoundedRectangle(cornerRadius: 6)
-                .fill(Color(nsColor: TagColor.nsColor(for: tagColors[tagName] ?? 0).withAlphaComponent(0.3))))
+        return HStack(spacing: 6) {
+            Circle()
+                .fill(isSelected ? Color.accentColor : Color.secondary.opacity(0.3))
+                .frame(width: 16, height: 16)
+                .overlay(isSelected ? Image(systemName: "checkmark").font(.system(size: 8, weight: .bold)).foregroundStyle(.white) : nil)
+            Text(tagName).font(.system(size: 13, weight: .medium)).foregroundStyle(.primary)
         }
-        .buttonStyle(.plain)
+        .padding(.horizontal, 10).padding(.vertical, 5)
+        .frame(maxWidth: .infinity, alignment: .leading)
+        .background(RoundedRectangle(cornerRadius: 6)
+            .fill(Color(nsColor: TagColor.nsColor(for: tagColors[tagName] ?? 0).withAlphaComponent(0.3))))
+        .contentShape(RoundedRectangle(cornerRadius: 6))
+        .onTapGesture {
+            if isSelected { selectedTagNames.remove(tagName) } else { selectedTagNames.insert(tagName) }
+        }
     }
 
     private func confirmAssign() {
@@ -523,7 +1009,7 @@
         }
         selectedAppPaths = []; selectedTagNames = []
         refreshApps()
-        withAnimation { successToast = "分类成功" }
+        withAnimation { successToast = tr("edit.success") }
     }
 
     private func cancelEditApps() {
@@ -573,7 +1059,17 @@
         let order = draggedTagNames.isEmpty
             ? TagEditor.orderedTagNames()
             : draggedTagNames
-        return AppIndexer.group(apps: allApps, defaultGroupName: defaultGroupName, tagOrder: order)
+        let raw = AppIndexer.group(apps: allApps, defaultGroupName: defaultGroupName, tagOrder: order)
+        // Translate stable keys for display
+        return raw.map { group in
+            if group.name == defaultGroupName {
+                return TagGroup(name: tr("group.uncategorized"), apps: group.apps)
+            }
+            if group.name == "Mac自带" {
+                return TagGroup(name: tr("group.appleBuiltIn"), apps: group.apps)
+            }
+            return group
+        }
     }
 
     // MARK: - Actions
@@ -582,11 +1078,97 @@
         withAnimation(.easeInOut(duration: 0.25)) { scrollProxy?.scrollTo(id, anchor: .top) }
     }
 
+    private func fillColorlessContainer(_ id: String) {
+        guard isColorlessContainerMode else { return }
+        filledColorlessContainer = id
+    }
+
+    private func toggleColorlessFill(_ id: String) {
+        guard isColorlessContainerMode else { return }
+        filledColorlessContainer = (filledColorlessContainer == id) ? nil : id
+    }
+
+    private func handleAppDrop(_ providers: [NSItemProvider], targetTag: String) -> Bool {
+        guard let provider = providers.first(where: { $0.hasItemConformingToTypeIdentifier(UTType.plainText.identifier) }) else {
+            return false
+        }
+        provider.loadItem(forTypeIdentifier: UTType.plainText.identifier, options: nil) { item, _ in
+            let text: String?
+            if let data = item as? Data {
+                text = String(data: data, encoding: .utf8)
+            } else if let string = item as? String {
+                text = string
+            } else if let string = item as? NSString {
+                text = string as String
+            } else {
+                text = nil
+            }
+            guard let text else { return }
+            let parts = text.components(separatedBy: "\n")
+            guard let path = parts.first, !path.isEmpty else { return }
+            let source = parts.dropFirst().first ?? ""
+            let copy = NSEvent.modifierFlags.contains(.option)
+            DispatchQueue.main.async {
+                dropApp(path: path, sourceTag: source, targetTag: targetTag, copy: copy)
+            }
+        }
+        return true
+    }
+
+    private func dropApp(path: String, sourceTag: String, targetTag: String, copy: Bool) {
+        appDragModeActive = false
+        guard !isSystemDefaultDropTarget(targetTag) else {
+            showDropWarning()
+            return
+        }
+        guard tagColors[targetTag] != nil else { return }
+        guard sourceTag != targetTag || copy else { return }
+        TagEditor.moveApp(
+            path: path,
+            from: sourceTag,
+            to: targetTag,
+            color: tagColors[targetTag] ?? 0,
+            copy: copy
+        )
+        refreshApps()
+    }
+
+    private func isSystemDefaultDropTarget(_ targetTag: String) -> Bool {
+        let defaultNames = [
+            defaultGroupName,
+            tr("group.uncategorized"),
+            "Mac自带",
+            tr("group.appleBuiltIn")
+        ]
+        return defaultNames.contains(targetTag)
+    }
+
+    private func showDropWarning() {
+        withAnimation(.spring(response: 0.24, dampingFraction: 0.82)) {
+            dropWarningToast = tr("drop.systemDefaultWarning")
+        }
+        DispatchQueue.main.asyncAfter(deadline: .now() + 1.6) {
+            withAnimation(.easeOut(duration: 0.18)) {
+                dropWarningToast = nil
+            }
+        }
+    }
+
+    private func setAppDragMode(_ active: Bool) {
+        appDragModeActive = active
+        if active {
+            DispatchQueue.main.asyncAfter(deadline: .now() + 8) {
+                if appDragModeActive {
+                    appDragModeActive = false
+                }
+            }
+        }
+    }
+
     func refreshApps() {
         DispatchQueue.global(qos: .userInitiated).async {
             var apps = AppIndexer.scan()
-            // Ensure migration ran at least once
-            let store = TagDatabase.migrateFromFinderIfNeeded(apps: apps)
+            let store = TagDatabase.load()
             apps = TagEditor.annotate(apps: apps)
             let colors = store.tags.mapValues { $0.color }
             let order = TagEditor.orderedTagNames()
@@ -599,8 +1181,20 @@
     }
 
     func openApp(_ app: AppInfo) {
+        appDragModeActive = false
         hideOverlay()
-        NSWorkspace.shared.open(app.path)
+        if let bundleIdentifier = app.bundleIdentifier {
+            NSWorkspace.shared.launchApplication(
+                withBundleIdentifier: bundleIdentifier,
+                options: [],
+                additionalEventParamDescriptor: nil,
+                launchIdentifier: nil
+            )
+            return
+        }
+
+        let configuration = NSWorkspace.OpenConfiguration()
+        NSWorkspace.shared.openApplication(at: app.path, configuration: configuration)
     }
 }
 

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