月更

AntDesignWPF/Layout/WaterfallPanel.cs

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+using System;
+using System.Linq;
+using System.Windows.Controls;
+
+namespace AntDesignWPF.Layout;
+
+public class WaterfallPanel : VirtualizingPanel
+{
+    public static readonly DependencyProperty ColumnsProperty =
+        DependencyProperty.Register(nameof(Columns), typeof(int), typeof(WaterfallPanel), new PropertyMetadata(3));
+
+    public static readonly DependencyProperty SpacingProperty =
+        DependencyProperty.Register(nameof(Spacing), typeof(double), typeof(WaterfallPanel), new PropertyMetadata(5.0));
+    private List<double> columnHeights = [];
+
+    protected override Size MeasureOverride(Size availableSize)
+    {
+        columnHeights.Clear();
+        var panelDesiredSize = new Size(0, 0);
+        columnHeights = new double[Columns].ToList();
+        double currentX = 0;
+        var width = availableSize.Width / Columns - (Columns * Spacing);
+        for(var i = 0; i < InternalChildren.Count; i++)
+        {
+            if(InternalChildren[i] is not FrameworkElement child)
+                continue;
+            child.Measure(availableSize);
+            child.Width = width;
+            var columnIndex = i % Columns;
+            var x = columnIndex != 0 ? currentX + Spacing : 0;
+            var y = columnHeights[columnIndex];
+            if(i >= Columns)
+                y = y + Spacing;
+            var size = new Size(width, child.DesiredSize.Height);
+            child.Arrange(new Rect(new Point(x, y), size));
+            panelDesiredSize.Width = Math.Max(panelDesiredSize.Width, x + child.DesiredSize.Width);
+            panelDesiredSize.Height = Math.Max(panelDesiredSize.Height, y + child.DesiredSize.Height);
+            currentX = x + size.Width;
+            if(currentX >= Width)
+                currentX = 0;
+            columnHeights[columnIndex] += child.DesiredSize.Height + (i >= Columns ? Spacing : 0);
+        }
+        return panelDesiredSize;
+    }
+
+    public void AddChild(UIElement element) { Children.Add(element); }
+
+    public int Columns { get { return (int)GetValue(ColumnsProperty); } set { SetValue(ColumnsProperty, value); } }
+
+    public double Spacing
+    {
+        get { return (double)GetValue(SpacingProperty); }
+        set { SetValue(SpacingProperty, value); }
+    }
+}