374 lines
13 KiB
C#
374 lines
13 KiB
C#
using System;
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using System.ComponentModel;
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using System.Windows;
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using System.Windows.Controls;
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using HandyControl.Data;
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using HandyControl.Expression.Drawing;
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namespace HandyControl.Controls;
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public class UniformSpacingPanel : Panel
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{
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private Orientation _orientation = Orientation.Horizontal;
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public static readonly DependencyProperty OrientationProperty =
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StackPanel.OrientationProperty.AddOwner(typeof(UniformSpacingPanel),
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new FrameworkPropertyMetadata(Orientation.Horizontal, FrameworkPropertyMetadataOptions.AffectsMeasure,
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OnOrientationChanged));
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private static void OnOrientationChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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var p = (UniformSpacingPanel) d;
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p._orientation = (Orientation) e.NewValue;
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}
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public Orientation Orientation
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{
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get => (Orientation) GetValue(OrientationProperty);
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set => SetValue(OrientationProperty, value);
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}
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public static readonly DependencyProperty ChildWrappingProperty = DependencyProperty.Register(
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nameof(ChildWrapping), typeof(VisualWrapping), typeof(UniformSpacingPanel),
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new FrameworkPropertyMetadata(default(VisualWrapping), FrameworkPropertyMetadataOptions.AffectsMeasure));
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public VisualWrapping ChildWrapping
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{
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get => (VisualWrapping) GetValue(ChildWrappingProperty);
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set => SetValue(ChildWrappingProperty, value);
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}
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public static readonly DependencyProperty SpacingProperty = DependencyProperty.Register(
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nameof(Spacing), typeof(double), typeof(UniformSpacingPanel),
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new FrameworkPropertyMetadata(double.NaN, FrameworkPropertyMetadataOptions.AffectsMeasure), IsSpacingValid);
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public double Spacing
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{
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get => (double) GetValue(SpacingProperty);
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set => SetValue(SpacingProperty, value);
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}
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public static readonly DependencyProperty HorizontalSpacingProperty = DependencyProperty.Register(
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nameof(HorizontalSpacing), typeof(double), typeof(UniformSpacingPanel),
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new FrameworkPropertyMetadata(double.NaN, FrameworkPropertyMetadataOptions.AffectsMeasure), IsSpacingValid);
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public double HorizontalSpacing
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{
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get => (double) GetValue(HorizontalSpacingProperty);
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set => SetValue(HorizontalSpacingProperty, value);
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}
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public static readonly DependencyProperty VerticalSpacingProperty = DependencyProperty.Register(
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nameof(VerticalSpacing), typeof(double), typeof(UniformSpacingPanel),
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new FrameworkPropertyMetadata(double.NaN, FrameworkPropertyMetadataOptions.AffectsMeasure), IsSpacingValid);
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public double VerticalSpacing
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{
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get => (double) GetValue(VerticalSpacingProperty);
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set => SetValue(VerticalSpacingProperty, value);
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}
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public static readonly DependencyProperty ItemWidthProperty = DependencyProperty.Register(
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nameof(ItemWidth), typeof(double), typeof(UniformSpacingPanel),
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new FrameworkPropertyMetadata(double.NaN, FrameworkPropertyMetadataOptions.AffectsMeasure),
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IsWidthHeightValid);
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[TypeConverter(typeof(LengthConverter))]
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public double ItemWidth
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{
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get => (double) GetValue(ItemWidthProperty);
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set => SetValue(ItemWidthProperty, value);
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}
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public static readonly DependencyProperty ItemHeightProperty = DependencyProperty.Register(
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nameof(ItemHeight), typeof(double), typeof(UniformSpacingPanel),
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new FrameworkPropertyMetadata(double.NaN, FrameworkPropertyMetadataOptions.AffectsMeasure),
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IsWidthHeightValid);
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[TypeConverter(typeof(LengthConverter))]
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public double ItemHeight
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{
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get => (double) GetValue(ItemHeightProperty);
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set => SetValue(ItemHeightProperty, value);
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}
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public static readonly DependencyProperty ItemHorizontalAlignmentProperty = DependencyProperty.Register(
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nameof(ItemHorizontalAlignment), typeof(HorizontalAlignment?), typeof(UniformSpacingPanel),
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new FrameworkPropertyMetadata(HorizontalAlignment.Stretch, FrameworkPropertyMetadataOptions.AffectsMeasure));
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public HorizontalAlignment? ItemHorizontalAlignment
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{
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get => (HorizontalAlignment?) GetValue(ItemHorizontalAlignmentProperty);
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set => SetValue(ItemHorizontalAlignmentProperty, value);
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}
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public static readonly DependencyProperty ItemVerticalAlignmentProperty = DependencyProperty.Register(
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nameof(ItemVerticalAlignment), typeof(VerticalAlignment?), typeof(UniformSpacingPanel),
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new FrameworkPropertyMetadata(VerticalAlignment.Stretch, FrameworkPropertyMetadataOptions.AffectsMeasure));
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public VerticalAlignment? ItemVerticalAlignment
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{
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get => (VerticalAlignment?) GetValue(ItemVerticalAlignmentProperty);
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set => SetValue(ItemVerticalAlignmentProperty, value);
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}
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private static bool IsWidthHeightValid(object value)
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{
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var v = (double) value;
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return double.IsNaN(v) || v >= 0.0d && !double.IsPositiveInfinity(v);
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}
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private static bool IsSpacingValid(object value)
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{
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if (value is double spacing)
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{
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return double.IsNaN(spacing) || spacing > 0;
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}
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return false;
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}
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private void ArrangeWrapLine(double v, double lineV, int start, int end, bool useItemU, double itemU,
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double spacing)
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{
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double u = 0;
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var isHorizontal = _orientation == Orientation.Horizontal;
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var children = InternalChildren;
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for (var i = start; i < end; i++)
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{
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var child = children[i];
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if (child == null || child.Visibility == Visibility.Collapsed) continue;
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var childSize = new PanelUvSize(_orientation, child.DesiredSize);
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var layoutSlotU = useItemU ? itemU : childSize.U;
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child.Arrange(isHorizontal ? new Rect(u, v, layoutSlotU, lineV) : new Rect(v, u, lineV, layoutSlotU));
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if (layoutSlotU > 0)
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{
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u += layoutSlotU + spacing;
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}
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}
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}
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private void ArrangeLine(double lineV, bool useItemU, double itemU, double spacing)
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{
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double u = 0;
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var isHorizontal = _orientation == Orientation.Horizontal;
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var children = InternalChildren;
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for (var i = 0; i < children.Count; i++)
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{
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var child = children[i];
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if (child == null || child.Visibility == Visibility.Collapsed) continue;
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var childSize = new PanelUvSize(_orientation, child.DesiredSize);
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var layoutSlotU = useItemU ? itemU : childSize.U;
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child.Arrange(isHorizontal ? new Rect(u, 0, layoutSlotU, lineV) : new Rect(0, u, lineV, layoutSlotU));
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if (layoutSlotU > 0)
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{
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u += layoutSlotU + spacing;
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}
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}
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}
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protected override Size MeasureOverride(Size constraint)
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{
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var curLineSize = new PanelUvSize(_orientation);
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var panelSize = new PanelUvSize(_orientation);
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var uvConstraint = new PanelUvSize(_orientation, constraint);
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var itemWidth = ItemWidth;
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var itemHeight = ItemHeight;
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var itemWidthSet = !double.IsNaN(itemWidth);
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var itemHeightSet = !double.IsNaN(itemHeight);
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var childWrapping = ChildWrapping;
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var itemHorizontalAlignment = ItemHorizontalAlignment;
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var itemVerticalAlignment = ItemVerticalAlignment;
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var itemHorizontalAlignmentSet = itemHorizontalAlignment != null;
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var itemVerticalAlignmentSet = itemVerticalAlignment != null;
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var spacingSize = GetSpacingSize();
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var childConstraint = new Size(
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itemWidthSet ? itemWidth : constraint.Width,
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itemHeightSet ? itemHeight : constraint.Height);
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var children = InternalChildren;
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var isFirst = true;
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if (childWrapping == VisualWrapping.NoWrap)
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{
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var layoutSlotSize = constraint;
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if (_orientation == Orientation.Horizontal)
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{
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layoutSlotSize.Width = double.PositiveInfinity;
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}
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else
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{
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layoutSlotSize.Height = double.PositiveInfinity;
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}
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for (int i = 0, count = children.Count; i < count; ++i)
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{
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var child = children[i];
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if (child == null || child.Visibility == Visibility.Collapsed) continue;
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if (itemHorizontalAlignmentSet)
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{
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child.SetCurrentValue(HorizontalAlignmentProperty, itemHorizontalAlignment);
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}
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if (itemVerticalAlignmentSet)
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{
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child.SetCurrentValue(VerticalAlignmentProperty, itemVerticalAlignment);
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}
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child.Measure(layoutSlotSize);
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var sz = new PanelUvSize(
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_orientation,
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itemWidthSet ? itemWidth : child.DesiredSize.Width,
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itemHeightSet ? itemHeight : child.DesiredSize.Height);
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curLineSize.U += isFirst ? sz.U : sz.U + spacingSize.U;
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curLineSize.V = Math.Max(sz.V, curLineSize.V);
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isFirst = false;
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}
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}
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else
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{
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for (int i = 0, count = children.Count; i < count; i++)
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{
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var child = children[i];
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if (child == null || child.Visibility == Visibility.Collapsed) continue;
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if (itemHorizontalAlignmentSet)
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{
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child.SetCurrentValue(HorizontalAlignmentProperty, itemHorizontalAlignment);
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}
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if (itemVerticalAlignmentSet)
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{
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child.SetCurrentValue(VerticalAlignmentProperty, itemVerticalAlignment);
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}
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child.Measure(childConstraint);
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var sz = new PanelUvSize(
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_orientation,
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itemWidthSet ? itemWidth : child.DesiredSize.Width,
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itemHeightSet ? itemHeight : child.DesiredSize.Height);
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if (!isFirst && MathHelper.GreaterThan(curLineSize.U + sz.U + spacingSize.U, uvConstraint.U))
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{
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panelSize.U = Math.Max(curLineSize.U, panelSize.U);
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panelSize.V += curLineSize.V + spacingSize.V;
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curLineSize = sz;
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}
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else
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{
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curLineSize.U += isFirst ? sz.U : sz.U + spacingSize.U;
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curLineSize.V = Math.Max(sz.V, curLineSize.V);
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}
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isFirst = false;
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}
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}
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panelSize.U = Math.Max(curLineSize.U, panelSize.U);
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panelSize.V += curLineSize.V;
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return new Size(panelSize.Width, panelSize.Height);
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}
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private PanelUvSize GetSpacingSize()
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{
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var spacing = Spacing;
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if (!double.IsNaN(spacing))
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{
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return new PanelUvSize(_orientation, spacing, spacing);
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}
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var horizontalSpacing = HorizontalSpacing;
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if (double.IsNaN(horizontalSpacing))
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{
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horizontalSpacing = 0;
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}
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var verticalSpacing = VerticalSpacing;
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if (double.IsNaN(verticalSpacing))
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{
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verticalSpacing = 0;
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}
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return new PanelUvSize(_orientation, horizontalSpacing, verticalSpacing);
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}
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protected override Size ArrangeOverride(Size finalSize)
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{
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var firstInLine = 0;
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var itemWidth = ItemWidth;
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var itemHeight = ItemHeight;
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double accumulatedV = 0;
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var itemU = _orientation == Orientation.Horizontal ? itemWidth : itemHeight;
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var curLineSize = new PanelUvSize(_orientation);
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var uvFinalSize = new PanelUvSize(_orientation, finalSize);
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var itemWidthSet = !double.IsNaN(itemWidth);
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var itemHeightSet = !double.IsNaN(itemHeight);
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var useItemU = _orientation == Orientation.Horizontal ? itemWidthSet : itemHeightSet;
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var childWrapping = ChildWrapping;
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var spacingSize = GetSpacingSize();
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var children = InternalChildren;
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var isFirst = true;
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if (childWrapping == VisualWrapping.NoWrap)
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{
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ArrangeLine(uvFinalSize.V, useItemU, itemU, spacingSize.U);
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}
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else
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{
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for (int i = 0, count = children.Count; i < count; i++)
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{
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var child = children[i];
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if (child == null || child.Visibility == Visibility.Collapsed) continue;
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var sz = new PanelUvSize(
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_orientation,
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itemWidthSet ? itemWidth : child.DesiredSize.Width,
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itemHeightSet ? itemHeight : child.DesiredSize.Height);
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if (!isFirst && MathHelper.GreaterThan(curLineSize.U + sz.U + spacingSize.U, uvFinalSize.U))
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{
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ArrangeWrapLine(accumulatedV, curLineSize.V, firstInLine, i, useItemU, itemU, spacingSize.U);
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accumulatedV += curLineSize.V + spacingSize.V;
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curLineSize = sz;
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firstInLine = i;
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}
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else
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{
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curLineSize.U += isFirst ? sz.U : sz.U + spacingSize.U;
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curLineSize.V = Math.Max(sz.V, curLineSize.V);
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}
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isFirst = false;
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}
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if (firstInLine < children.Count)
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{
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ArrangeWrapLine(accumulatedV, curLineSize.V, firstInLine, children.Count, useItemU, itemU,
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spacingSize.U);
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}
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}
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return finalSize;
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}
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}
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