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Wpf.Ui.Extend/Layouts/StackPanelEx.cs
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284
Wpf.Ui.Extend/Layouts/StackPanelEx.cs
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using System;
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using System.ComponentModel;
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using System.Linq;
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using System.Windows;
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using System.Windows.Controls;
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namespace Wpf.Ui.Extend.Layouts;
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/// <summary>
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/// 堆叠面板
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/// </summary>
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public class StackPanelEx : Panel
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{
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/// <summary>
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/// 设置某子项附加属性，控制其是否填充到当前StackPanel所在的面板（控制单个子项的在面板填充方式）
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/// </summary>
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public static readonly DependencyProperty FillProperty = DependencyProperty.RegisterAttached(
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"Fill",
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typeof(FillType),
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typeof(StackPanelEx),
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new FrameworkPropertyMetadata(
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FillType.Auto,
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FrameworkPropertyMetadataOptions.AffectsArrange
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| FrameworkPropertyMetadataOptions.AffectsMeasure
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| FrameworkPropertyMetadataOptions.AffectsParentArrange
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| FrameworkPropertyMetadataOptions.AffectsParentMeasure
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)
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);
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public static readonly DependencyProperty SpacingProperty = DependencyProperty.Register(
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nameof(Spacing),
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typeof(double),
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typeof(StackPanelEx),
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new FrameworkPropertyMetadata(
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0.0,
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FrameworkPropertyMetadataOptions.AffectsArrange | FrameworkPropertyMetadataOptions.AffectsMeasure
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)
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);
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public static readonly DependencyProperty OrientationProperty = DependencyProperty.Register(
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nameof(Orientation),
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typeof(Orientation),
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typeof(StackPanelEx),
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new FrameworkPropertyMetadata(
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Orientation.Vertical,
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FrameworkPropertyMetadataOptions.AffectsArrange | FrameworkPropertyMetadataOptions.AffectsMeasure
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)
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);
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static double CalculateTotalMarginToAdd(UIElementCollection children, double marginBetweenChildren)
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{
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//可见的子项数量
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var visibleChildrenCount = children
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.OfType<UIElement>()
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.Count(x => x.Visibility != Visibility.Collapsed && GetFill(x) != FillType.Ignored);
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var marginMultiplier = Math.Max(visibleChildrenCount - 1, 0);
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var totalMarginToAdd = marginBetweenChildren * marginMultiplier;
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return totalMarginToAdd;
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}
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protected override Size ArrangeOverride(Size arrangeSize)
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{
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var children = InternalChildren;
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var totalChildrenCount = children.Count;
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double accumulatedLeft = 0;
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double accumulatedTop = 0;
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var isHorizontal = Orientation == Orientation.Horizontal;
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var spacing = Spacing;
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var totalMarginToAdd = CalculateTotalMarginToAdd(children, spacing);
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var allAutoSizedSum = 0.0;
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var countOfFillTypes = 0;
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foreach (var child in children.OfType<UIElement>())
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{
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var fillType = GetFill(child);
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if (fillType != FillType.Auto)
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{
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if (child.Visibility != Visibility.Collapsed && fillType != FillType.Ignored)
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countOfFillTypes += 1;
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}
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else
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{
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var desiredSize = isHorizontal ? child.DesiredSize.Width : child.DesiredSize.Height;
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allAutoSizedSum += desiredSize;
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}
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}
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var remainingForFillTypes = isHorizontal
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? Math.Max(0, arrangeSize.Width - allAutoSizedSum - totalMarginToAdd)
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: Math.Max(0, arrangeSize.Height - allAutoSizedSum - totalMarginToAdd);
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var fillTypeSize = remainingForFillTypes / countOfFillTypes;
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for (var i = 0; i < totalChildrenCount; ++i)
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{
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var child = children[i];
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if (child == null)
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{
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continue;
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}
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var childDesiredSize = child.DesiredSize;
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var fillType = GetFill(child);
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var isCollapsed = child.Visibility == Visibility.Collapsed || fillType == FillType.Ignored;
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var isLastChild = i == totalChildrenCount - 1;
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var marginToAdd = isLastChild || isCollapsed ? 0 : spacing;
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var rcChild = new Rect(
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accumulatedLeft,
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accumulatedTop,
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Math.Max(0.0, arrangeSize.Width - accumulatedLeft),
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Math.Max(0.0, arrangeSize.Height - accumulatedTop)
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);
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if (isHorizontal)
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{
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rcChild.Width = fillType == FillType.Auto || isCollapsed ? childDesiredSize.Width : fillTypeSize;
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rcChild.Height = arrangeSize.Height;
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accumulatedLeft += rcChild.Width + marginToAdd;
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}
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else
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{
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rcChild.Width = arrangeSize.Width;
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rcChild.Height = fillType == FillType.Auto || isCollapsed ? childDesiredSize.Height : fillTypeSize;
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accumulatedTop += rcChild.Height + marginToAdd;
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}
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child.Arrange(rcChild);
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}
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return arrangeSize;
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}
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protected override Size MeasureOverride(Size constraint)
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{
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var children = InternalChildren;
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double parentWidth = 0;
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double parentHeight = 0;
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double accumulatedWidth = 0;
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double accumulatedHeight = 0;
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var isHorizontal = Orientation == Orientation.Horizontal;
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var totalMarginToAdd = CalculateTotalMarginToAdd(children, Spacing);
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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)
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{
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continue;
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}
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// 先处理Auto的情况，再计算Fill的剩余空间
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if (GetFill(child) != FillType.Auto)
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{
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continue;
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}
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// 子项约束为剩余大小; 即总大小减去前一个子项目消耗的大小。
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var childConstraint = new Size(
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Math.Max(0.0, constraint.Width - accumulatedWidth),
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Math.Max(0.0, constraint.Height - accumulatedHeight)
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);
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// 计算子项
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child.Measure(childConstraint);
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var childDesiredSize = child.DesiredSize;
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if (isHorizontal)
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{
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accumulatedWidth += childDesiredSize.Width;
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parentHeight = Math.Max(parentHeight, accumulatedHeight + childDesiredSize.Height);
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}
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else
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{
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parentWidth = Math.Max(parentWidth, accumulatedWidth + childDesiredSize.Width);
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accumulatedHeight += childDesiredSize.Height;
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}
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}
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// 在计算剩余空间之前，将所有边距添加到累积大小中，以便填充元素。
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if (isHorizontal)
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{
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accumulatedWidth += totalMarginToAdd;
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}
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else
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{
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accumulatedHeight += totalMarginToAdd;
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}
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//Fill类型的总数量
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var totalCountOfFillTypes = children
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.OfType<UIElement>()
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.Count(x => GetFill(x) == FillType.Fill && x.Visibility != Visibility.Collapsed);
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//可用的剩余空间
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var availableSpaceRemaining = isHorizontal
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? Math.Max(0, constraint.Width - accumulatedWidth)
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: Math.Max(0, constraint.Height - accumulatedHeight);
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var eachFillTypeSize = totalCountOfFillTypes > 0 ? availableSpaceRemaining / totalCountOfFillTypes : 0;
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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)
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{
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continue;
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}
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// 处理所有的填充，给它们一部分剩余空间
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if (GetFill(child) != FillType.Fill)
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{
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continue;
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}
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// 子项限制是剩余大小；即总大小减去前一个子项限制所消耗的大小。
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var childConstraint = isHorizontal
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? new Size(eachFillTypeSize, Math.Max(0.0, constraint.Height - accumulatedHeight))
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: new Size(Math.Max(0.0, constraint.Width - accumulatedWidth), eachFillTypeSize);
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// 测量子项.
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child.Measure(childConstraint);
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var childDesiredSize = child.DesiredSize;
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if (isHorizontal)
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{
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accumulatedWidth += childDesiredSize.Width;
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parentHeight = Math.Max(parentHeight, accumulatedHeight + childDesiredSize.Height);
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}
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else
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{
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parentWidth = Math.Max(parentWidth, accumulatedWidth + childDesiredSize.Width);
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accumulatedHeight += childDesiredSize.Height;
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}
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}
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// 确保最终累积的大小反映在 parentSize 中。
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parentWidth = Math.Max(parentWidth, accumulatedWidth);
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parentHeight = Math.Max(parentHeight, accumulatedHeight);
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var parent = new Size(parentWidth, parentHeight);
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return parent;
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}
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public static FillType GetFill(DependencyObject element)
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{
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return (FillType)element.GetValue(FillProperty);
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}
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public static void SetFill(DependencyObject element, FillType value)
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{
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element.SetValue(FillProperty, value);
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}
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/// <summary>
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/// 子项间距
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/// </summary>
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public double Spacing
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{
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get { return (double)GetValue(SpacingProperty); }
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set { SetValue(SpacingProperty, value); }
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}
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/// <summary>
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/// 堆叠方向
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/// </summary>
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public Orientation Orientation
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{
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get { return (Orientation)GetValue(OrientationProperty); }
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set { SetValue(OrientationProperty, value); }
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}
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}
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public enum FillType
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{
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[Description("实际大小填充")]
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Auto,
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[Description("填充剩余空间相当于Stretch")]
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Fill,
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[Description("忽略当前项")]
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Ignored
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}
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