WPF使用WrapPanel实现虚拟化效果

WrapPanel 实现虚拟化

1.框架使用大于等于.NET40；

2.Visual Studio 2022;

3.项目使用 MIT 开源许可协议；

4.众所周知 wpF 的 StackPanel 在加载大量数据时性能会特别差，但是官方提供了一个虚拟化容器VirtualizingStackPanel；

• VirtualizingStackPanel.IsVirtualizing 附加属性设置为 true时就开启虚拟化。
• VirtualizingStackPanel.IsVirtualizing 附加属性设置为 false其VirtualizingStackPanel行为与普通StackPanel属性的行为相同。

5.WrapPanel 默认是不支持虚拟化的，所以需要自行实现。

1） VirtualizingWrapPanel 查看源码  |   VirtualizingWrapPanel 查看源码。

2） 准备数据HospitalList.cs如下：

usingSystem;
usingSystem.Collections.Generic;
usingSystem.Collections.ObjectModel;
usingSystem.Windows.Media;

namespaceWPFDevelopers.Minimal.Sample.Models
{
publicclassHospitalLisjst:ObservableCollection<Hospital>
{
publicHospitalList()
{
varhospitals=newstring[]{"No.189,GroveSt,LosAngeles","No.3669,GroveSt,LosAngeles"};
varnames=newstring[]{"DoctorFang","JudgeQu"};
varimages=newstring[]
{"https://pic2.zhimg.com/80/v2-0711e97955adc9be9fbcff67e1007535_720w.jpg",
//"https://pic2.zhimg.com/80/v2-5b7f84c63075ba9771f6e6dc29a54615_720w.jpg",
"https://pic3.zhimg.com/80/v2-a3d6d8832090520e7ed6c748a8698e4e_720w.jpg",
"https://pic3.zhimg.com/80/v2-de7554ac9667a59255fe002bb8753ab6_720w.jpg"
};
varstate=0;
for(vari=1;i<10000;i++)
{
Add(newHospital{Id=$"9999{i}",DoctorName=i%2==0?names[0]:names[1],HospitalName=i%2==0?hospitals[0]:hospitals[1],State=state,UserImage=images[state]});
state++;
if(state>2)
state=0;
}
}
}

publicclassHospital
{
publicstringId{get;set;}
publicstringDoctorName{get;set;}
publicstringHospitalName{get;set;}
publicstringUserImage{get;set;}
publicintState{get;set;}
}
}

3） 新建展示VirtualizingWrapPanelExample.xaml如下：

<ws:Windowx:Class="WPFDevelopers.Minimal.Sample.ExampleViews.VirtualizingWrapPanelExample"
XMLns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:ws="https://github.com/WPFDevelopersOrg/WPFDevelopers.Minimal"
xmlns:local="clr-namespace:WPFDevelopers.Minimal.Sample.ExampleViews"
xmlns:model="clr-namespace:WPFDevelopers.Minimal.Sample.Models"
xmlns:converts="clr-namespace:WPFDevelopers.Minimal.Sample.Converts"
mc:Ignorable="d"WindowStartupLocation="CenterScreen"
Title="SystemV1.0"Height="450"Width="900">
<Window.Resources>
<model:HospitalListx:Key="myHospitalList"/>
<converts:StateConvertx:Key="stateConvert"></converts:StateConvert>
</Window.Resources>
<GridMargin="4">
<WrapPanelHorizontalAlignment="Left">
<WrapPanel.Resources>
<StyleTargetType="Border">
<SetterProperty="Padding"Value="2"></Setter>
<SetterProperty="BorderThickness"Value="1"></Setter>
</Style>
<StyleTargetType="Rectangle">
<SetterProperty="Width"Value="15"></Setter>
<SetterProperty="Height"Value="15"></Setter>
<SetterProperty="Opacity"Value=".2"></Setter>
</Style>
</WrapPanel.Resources>
<WrapPanel>
<BorderBorderBrush="Green">
<RectangleFill="Green"/>
</Border>
<TextblockText="Idle"Foreground="Black"Margin="4,0"/>
</WrapPanel>
<WrapPanel>
<BorderBorderBrush="Orange">
<RectangleFill="Orange"/>
</Border>
<TextBlockText="SlightlyIdle"Foreground="Black"Margin="4,0"/>
</WrapPanel>
<WrapPanel>
<BorderBorderBrush="Red">
<RectangleFill="Red"/>
</Border>
<TextBlockText="Busy"Foreground="Black"Margin="4,0"/>
</WrapPanel>
</WrapPanel>
<TextBlockHorizontalAlignment="Right"Foreground="Black"
Margin="4,2"FontSize="16">
<RunText="Count："></Run>
<RunText="{BindingElementName=DocumentsList,Path=.Items.Count,Mode=OneTime}"></Run>
</TextBlock>

<ListBoxx:Name="DocumentsList"
ItemsSource="{BindingSource={StaticResourcemyHospitalList}}"
Margin="0,24,0,0">
<ListBox.ItemTemplate>
<DataTemplate>
<BorderBorderBrush="{BindingState,Converter={StaticResourcestateConvert}}"
BorderThickness="1"
Width="196"
Height="94">
<Grid>
<Grid编程.ColumnDefinitions>
<ColumnDefin编程ition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowandroidDefinition/>
</Grid.RowDefinitions>
<Rectangle
Fill="{BindingState,Converter={StaticResourcestateConvert}}"
Opacity=".2"Grid.ColumnSpan="2"
Grid.RowSpan="3"/>

<BorderGrid.RowSpan="2"Grid.Column="0"Width="60"Height="60"
Margin="0,4,0,0"CornerRadius="10">
<Border.Background>
<ImageBrushImageSource="{BindingUserImage}"Stretch="Uniform"/>
</Border.Background>
</Border>
<TextBlockGrid.Column="1开发者_开发教程"Grid.Row="0"
Text="{BindingPath=Id}"Margin="0,4,0,0"/>
<TextBlockGrid.Column="1"Grid.Row="1"
Text="{BindingPath=DoctorName}"/>
<TextBlockGrid.ColumnSpan="2"Grid.Row="2"
Padding="10,0"
Text="{BindingPath=HospitalName}"TextTrimming="CharacterEllipsis"/>
</Grid>
</Border>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.Template>
<ControlTemplate>
<BorderCornerRadius="2"
BorderBrush="{TemplateBindingBorderBrush}SCYztsNU"
BorderThickness="{TemplateBindingBorderThickness}">
<ScrollViewerx:Name="ScrollViewer"
Padding="{TemplateBindingPadding}"
Background="{TemplateBindingBackground}"
BorderBrush="Transparent"BorderThickness="0"IsTabStop="False">
<ItemsPresenter/>
</ScrollViewer>
</Border>
</ControlTemplate>
</ListBox.Template>

<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<ws:VirtualizingWrapPanelItemWidth="200"
ItemHeight="100"/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
</Grid>
</ws:Window>

4） 状态StateConvert.cs如下：

usingSystem;
usingSystem.Windows.Data;
usingSystem.Windows.Media;

namespaceWPFDevelopers.Minimal.Sample.Converts
{
publicclassStateConvert:IValueConverter
{
publicobjectConvert(objectvalue,TypetargetType,objectparameter,System.Globalization.CultureInfocultureInfo)
{
varcolor=Brushes.Green;
if(value!=null)
{
varstate=int.Parse(value.ToString());
switch(state)
{
case0:
color=Brushes.Green;
break;
case1:
color=Brushes.Orange;
break;
case2:
color=Brushes.Red;
break;
}
}

returncolor;
}
publicobjectConvertBack(objectvalue,TypetargetType,objectparameter,System.Globalization.CultureInfocultureInfo)
{
thrownewNotImplementedException();
}
}
}

实现效果

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