更新

WPFDark/Controls/BiaTableGrid.cs

@@ -0,0 +1,165 @@
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+
+namespace WPFDark.Controls
+{
+    public class BiaTableGrid : Grid
+    {
+        #region Spacing
+
+        public Size Spacing
+        {
+            get => _Spacing;
+            set
+            {
+                if (value != _Spacing)
+                    SetValue(SpacingProperty, value);
+            }
+        }
+
+        private Size _Spacing;
+
+        public static readonly DependencyProperty SpacingProperty =
+            DependencyProperty.Register(
+                nameof(Spacing),
+                typeof(Size),
+                typeof(BiaTableGrid),
+                new PropertyMetadata(
+                    default(Size),
+                    (s, e) =>
+                    {
+                        var self = (BiaTableGrid) s;
+                        self._Spacing = (Size) e.NewValue;
+
+                        self.UpdateColumns();
+                    }));
+
+        #endregion
+
+        #region Columns
+
+        public int Columns
+        {
+            get => _Columns;
+            set
+            {
+                if (value != _Columns)
+                    SetValue(ColumnsProperty, value);
+            }
+        }
+
+        private int _Columns;
+
+        public static readonly DependencyProperty ColumnsProperty =
+            DependencyProperty.Register(
+                nameof(Columns),
+                typeof(int),
+                typeof(BiaTableGrid),
+                new FrameworkPropertyMetadata(
+                    0,
+                    FrameworkPropertyMetadataOptions.AffectsMeasure,
+                    (s, e) =>
+                    {
+                        var self = (BiaTableGrid) s;
+                        self._Columns = (int) e.NewValue;
+
+                        self.UpdateColumns();
+                    }));
+
+        #endregion
+
+        private void UpdateColumns()
+        {
+            var childCount = VisualTreeHelper.GetChildrenCount(this);
+
+            {
+                while (ColumnDefinitions.Count < childCount)
+                {
+                    var cd = new ColumnDefinition
+                    {
+                        Width = new GridLength(0, GridUnitType.Auto)
+                    };
+                    ColumnDefinitions.Add(cd);
+                }
+
+                while (ColumnDefinitions.Count > childCount)
+                    ColumnDefinitions.RemoveAt(ColumnDefinitions.Count - 1);
+            }
+
+            {
+                var rows = childCount / Columns;
+
+                while (RowDefinitions.Count < rows)
+                {
+                    var rd = new RowDefinition
+                    {
+                        Height = new GridLength(0, GridUnitType.Star)
+                    };
+                    RowDefinitions.Add(rd);
+                }
+
+                while (RowDefinitions.Count > rows)
+                    RowDefinitions.RemoveAt(RowDefinitions.Count - 1);
+            }
+
+            {
+                var columnCount = 0;
+                var rowCount = 0;
+
+                var rows = childCount / Columns;
+                
+                var isLastRow = rowCount == rows - 1;
+                
+                for (var i = 0; i != childCount; ++i)
+                {
+                    var child = (FrameworkElement) VisualTreeHelper.GetChild(this, i);
+                    
+                    SetColumn(child, columnCount);
+                    SetRow(child, rowCount);
+
+                    var isLastItem = i == childCount - 1;
+
+                    var px = columnCount == Columns - 1 || isLastItem
+                        ? 0d
+                        : Spacing.Width;
+                    var py = isLastRow  || isLastItem
+                        ? 0d
+                        : Spacing.Height;
+                    
+                    child.Margin = new Thickness(0d, 0d, px, py);
+
+                    ++columnCount;
+
+                    if (columnCount == Columns)
+                    {
+                        columnCount = 0;
+                        ++rowCount;
+
+                        isLastRow = rowCount == rows - 1;
+                    }
+                }
+            }
+        }
+
+        protected override Size ArrangeOverride(Size arrangeSize)
+        {
+            if (_isRequestUpdateColumns)
+            {
+                UpdateColumns();
+                _isRequestUpdateColumns = false;
+            }
+
+            return base.ArrangeOverride(arrangeSize);
+        }
+
+        private bool _isRequestUpdateColumns;
+
+        protected override void OnVisualChildrenChanged(DependencyObject visualAdded, DependencyObject visualRemoved)
+        {
+            _isRequestUpdateColumns = true;
+
+            base.OnVisualChildrenChanged(visualAdded, visualRemoved);
+        }
+    }
+}