From 3d8d37306e39db5c8eb41fafd95a13112d573f62 Mon Sep 17 00:00:00 2001
From: Ariver <shanghai3168@gmail.com>
Date: Thu, 11 Jun 2026 22:24:39 +0800
Subject: [PATCH] Center filtered Waterfall columns

---
 C1.source/Sources/Aligner/QuickSwitchRootView.swift |   28 +++++++++++++++++++++++++---
 1 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/C1.source/Sources/Aligner/QuickSwitchRootView.swift b/C1.source/Sources/Aligner/QuickSwitchRootView.swift
index 0b4e062..4f8f371 100644
--- a/C1.source/Sources/Aligner/QuickSwitchRootView.swift
+++ b/C1.source/Sources/Aligner/QuickSwitchRootView.swift
@@ -1668,6 +1668,11 @@
             return
         }
 
+        if waterfallShouldKeepFilteredColumnsCentered {
+            ensureWaterfallCardVisibleVertically(selection)
+            return
+        }
+
         switch horizontalIntent {
         case .reveal:
             ensureWaterfallColumnVisible(column)
@@ -1751,6 +1756,10 @@
     }
 
     private var waterfallAlignmentScrollRange: ClosedRange<CGFloat> {
+        if waterfallShouldKeepFilteredColumnsCentered {
+            return 0...0
+        }
+
         var minimumOffset: CGFloat = 0
         var maximumOffset = waterfallMaxScrollOffset
 
@@ -1775,6 +1784,10 @@
     private func clampedWaterfallAlignmentOffset(_ offset: CGFloat) -> CGFloat {
         let range = waterfallAlignmentScrollRange
         return min(max(range.lowerBound, offset), range.upperBound)
+    }
+
+    private var waterfallShouldKeepFilteredColumnsCentered: Bool {
+        currentViewModel?.lockedSpaceID != nil && waterfallMaxScrollOffset <= 0.5
     }
 
     private func setWaterfallScrollOffset(_ offset: CGFloat, animated: Bool) {
@@ -3019,9 +3032,9 @@
         }
 
         let columnWidth = waterfallColumnWidth()
-        let totalWidth = WaterfallMetrics.contentHorizontalPadding * 2
-            + CGFloat(waterfallColumns.count) * columnWidth
+        let columnsWidth = CGFloat(waterfallColumns.count) * columnWidth
             + CGFloat(max(0, waterfallColumns.count - 1)) * WaterfallMetrics.gap
+        let totalWidth = WaterfallMetrics.contentHorizontalPadding * 2 + columnsWidth
         waterfallContentWidth = max(waterfallLayer.bounds.width, totalWidth)
         waterfallScrollOffset = clampedWaterfallAlignmentOffset(waterfallScrollOffset)
         waterfallContentLayer.frame = CGRect(
@@ -3031,7 +3044,7 @@
             height: waterfallLayer.bounds.height
         )
 
-        var x = WaterfallMetrics.contentHorizontalPadding
+        var x = waterfallColumnStartX(columnsWidth: columnsWidth)
         for column in waterfallColumns {
             column.containerLayer.frame = CGRect(
                 x: x,
@@ -3044,6 +3057,15 @@
         }
     }
 
+    private func waterfallColumnStartX(columnsWidth: CGFloat) -> CGFloat {
+        guard currentViewModel?.lockedSpaceID != nil else {
+            return WaterfallMetrics.contentHorizontalPadding
+        }
+
+        let centeredStart = (waterfallContentWidth - columnsWidth) / 2
+        return max(WaterfallMetrics.contentHorizontalPadding, centeredStart)
+    }
+
     private func layoutWaterfallColumn(_ column: WaterfallColumnLayers) {
         let bounds = column.containerLayer.bounds
         let isSpaceFocused = spaceFocusWindowCount(for: column.column.appGroupIndex) > 0

--
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