wpF 实现瀑布流控件
框架支持.NET4 至 .NET8；
Visual Studio 2022;
需求详见 ISSUE
实现代码
1）新增 WaterfallPanel.cs 代码如下:
WaterfallPanel的自定义控件，继承自VirtualizingPanel。WaterfallPanel控件实现了瀑布流布局，即将多个子元素按照一定规则排列在面板中。该控件具有Columns和Spacing两个依赖属性，分别表示列数和每个子控件之间的间距。MeasureOverride用于测量和排列子控件。在WaterfallPanel的MeasureOverride方法中，先清除了列高的记录，然后计算出每一列的高度并保存在一个List中。接着，遍历所有子控件，将它们测量并按规则排列在面板中，同时更新列高和面板的大小。AddChild方法向面板中添加子控件。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Controls;
using System.Windows;
namespace WPFDevelopers.Controls
{
public class WaterfallPanel : VirtualizingPanel
{
private List<double> columnHeights = new List<double>();
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 (int i = 0; i < InternalChildren.Count; i++)
{
var child = InternalChildren[i] as FrameworkElement;
if (child == null)
continue;
child.Measure(availableSize);
child.Width = width;
int columnIndex = i % Columns;
double x = columnIndex != 0 ? currentX + Spacing : 0;
double 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 static readonly DependencyProperty ColumnsProperty =
DependencyProperty.Register("Columns", typeof(int), typeof(WaterfallPanel), new PropertyMetadata(3));
public double Spacing
{
get { return (double)GetValue(SpacingProperty); }
set { SetValue(SpacingProperty, value); }
}
public static readonly DependencyProperty SpacingProperty =
DependencyProperty.Register("Spacing", typeof(double), typeof(WaterfallPanel), new PropertyMetadata(5.0));
}
}
2）示例（一）代码WaterfallPanelExample.xaml如下:
<ScrollViewer>
<wd:WaterfallPanel Width="750">
<wd:WaterfallPanel.Resources>
<Style TargetType="Border">
<Setter Property="CornerRadius" Value="10" />
<Setter Property="BorderBrush" Value="LightGray" />
<Setter Property="BorderThickness" Value="1" />
</Style>
<Style TargetType="ImageBrush">
<Setter Property="Stretch" Value="Fill" />
</Style>
<Style TargetType="Textblock">
<Setter Property="Margin" Value="4,10" />
<Setter Property="Foreground" Value="White" />
</Style>
<Style x:Key="BorderContent" TargetType="Border">
<Setter Property="Height" Value="40" />
<Setter Property="CornerRadius" Value="10,10,0,0" />
<Setter Property="VerticalAlignment" Value="Top" />
<Setter Property="Background">
<Setter.Value>
<LinearGradientBrush Opacity=".3" StartPoint="0,.5" EndPoint="0,1">
<GradientStop Offset="0" Color="DimGray" />
<GradientStop Offset="0.9" Color="Gray" />
<GradientStop Offset="1" Color="Transparent" />
</LinearGradientBrush>
</Setter.Value>
</Setter>
</Style>
</wd:WaterfallPanel.Resources>
<Border Height="340">
<Border.Background>
<ImageBrush ImageSource="http://tse2-mm.cn.bing.net/th/id/OIP-C.WVAYTzW5VMZgAErg-y6EgwAAAA" />
</Border.Background>
<Border Style="{StaticResource BorderContent}">
<TextBlock Text="WVAYTzW5VMZgAErg" />
</Border>
</Border>
<Border Height="300">
<Border.Background>
<ImageBrush ImageSource="http://tse1-mm.cn.bing.net/th/id/OIP-C.e51iwDiqzatju6Bf50lJ2QHaMW" />
</Border.Background>
<Border Style="{StaticResource BorderContent}">
<TextBlock Text="e51iwDiqzatju6Bf50lJ2QHaMW" />
</Border>
</Border>
<Border Height="280">
<Border.Background>
<ImageBrush ImageSource="http://tse1-mm.cn.bing.net/th/id/OIP-C.DB2fWdfqfr8w3sP7wiboHgHaNK" />
</Bordjavascripter.Background>
<Border Style="{StaticResource BorderContent}">
<TextBlock Text="dB2fWdfqfr8w3sP7wiboHgHaNK" />
</Border>
</Border>
<Border Height="350">
<Border.Background>
<ImageBrush ImageSource="http://tse4-mm.cn.bing.net/th/id/OIP-C.IzGLt2NgGhakuvbk008FOwHaK9" />
</Border.Background>
<Border Style="{StaticResource BorderContent}">
<TextBlock Text="IzGLt2NgGhakuvbk008FOwHaK9" />
</Border>
</Border>
<Border Height="400">
<Border.Background>
<ImageBrush ImageSource="http://pic4.zhimg.com/v2-6233e57a364dcb3b6c5f066f8b30dab4_r.jpg" />
</Border.Background>
<Border Style="{StaticResource BorderContent}">
<TextBlock Text="6233e57a364dcb3b6c5f066f8b30dab4_r" />
</Border>
</Border>
<Border Height="240">
<Border.Background>
<ImageBrush ImageSource="http://tse1-mm.cn.bing.net/th/id/OIP-C.ivs2k5Q7Zx7WRZVuSDUJqQHaJ4" />
</Border.Background>
<Border Style="{StaticResource BorderContent}">
<TextBlock Text="ivs2k5Q7Zx7WRZVuSDUJqQHaJ4" />
</Border>
</Border>
<Border Height="290">
<Border.Background>
<ImageBrush ImageSource="http://tse3-mm.cn.bing.net/th/id/OIP-C.sTVQljOS9ntgkUyvDXk68AHaKe" />
</Border.Background>
<Border Style="{StaticResource BorderContent}">
<TextBlock Text="sTVQljOS9ntgkUyvDXk68AHaKe" />
</Border>
</Border>
<Border Height="207">
<Border.Backgrouandroidnd>
<ImageBrush ImageSource="http://tse2-mm.cn.bing.net/th/id/OIP-C.caVFPs_YGiHH-7vOpQ7GqwHaHY" />
</Border.Background>
<Border Style="{StaticResource BorderContent}">
<TextBlock Text="7vOpQ7GqwHaHY" />
</Border>
</Border>
<Border Height="200">
<Border.Background>
<ImageBrush ImageSource="http://tse2-mm.cn.bing.net/th/id/OIP-C.T_Zi1o-AYSCp4c00D_zCVAHaHa" />
</Border.Background>
<Border Style="{StaticResource BorderContent}">
<TextBlock Text="AYSCp4c00D_zCVAHaHa" />
</Border>
</Border>
<Border Height="220">
<Border.Background>
<ImageBrush ImageSource="http://tse2-mm.cn.bing.net/th/id/OIP-C.-EGv7Ycl5Zu46_YIGjNuDgHaH4" />
</Border.Background>
<Border Style="{StaticResource BorderContent}">
<TextBlock Text="EGv7Ycl5Zu46_YIGjNuDgHaH4" />
</Border>
</Border>
<Border Height="200">
编程客栈 <Border.Background>
<ImageBrush ImageSource="http://tse4-mm.cn.bing.net/th/id/OIP-C.TQ1f0BMQ7Bo7PuRKnCJAMAHaHa" />
</Border.Background>
<Border Style="{StaticResource BorderChttp://www.devze.comontent}">
<TextBlock Text="TQ1f0BMQ7Bo7PuRKnCJAMAHaHa" />
</Border>
</Border>
<Border Height="450">
<B编程客栈order.Background>
<ImageBrush ImageSource="http://img.zcool.cn/community/01493f5d11d9cca801205e4b24e764.jpg" />
</Border.Background>
<Border Style="{StaticResource BorderContent}">
<TextBlock Text="01493f5d11d9cca801205e4b24e764" />
</Border>
</Border>
</wd:WaterfallPanel>
</ScrollViewer>
3）示例（二）后台添加代码WaterfallPanelExample.xaml.cs 如下:
var ran = new Random();
for (int i = 0; i < 1000; i++)
{
var btn = new Button { Content = i.ToString(), Height = (double)ran.Next(100, 1000) };
MyWaterfallPanel.AddChild(btn);
}
效果图
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