WPF 自定义TreeView控件样式，仿QQ联系人列表
一、前言
TreeView控件在项目中使用比较频繁，普通的TreeView并不能满足我们的需求。因此我们需要滴对TreeView进行改造。下面的内容将介绍仿QQ联系人TreeView样式及TreeView数据绑定方法。
二、TreeView仿QQ联系人列表
准确的说不是仿QQ联系人列表，这个TreeView样式作为组织架构来使用更好。废话不多说，先看效果：
2.1、基本思路
像这种联系人列表一般涉及到多层级数据，而且有很多数据是需要动态更新的，如果通过手动一条条增加数据反而更复杂，而且不方便。因此为了绑定数据方便我们使用分层模板HierarchicalDataTemplate。
分层模板中存在两种样式，一种是分组样式，一种是人员样式。不管是分组还是人员绑定的都是对象，这样我们在对象中添加一个属性来辨别是否为分组-IsGrouping。
默认的TreeView控件四周会有边距，因此需要设置下TreeView的样式。另外鼠标经过和鼠标选中的背景色需要变化，因此还需要设置TreeViewItem的样式。
根据思路，我们需要设置三个样式，TreeView样式，TreeViewItem样式，HierarchicalDataTemplate分层模板样式。另外为了自动计算下一级的边距，我们需要添加一个转换器IndentConverter。还需要一个转换器需要将布尔类型的IsGrouping转换为Visibility，还需要一个转换器来对Visibility取反。
这样三个样式，三个转换器。就可以实现我们上面的效果，另外还可以进行动态数据绑定。
2.2、样式代码
HierarchicalDataTemplate分层模板样式代码
<HierarchicalDataTemplate x:Key="ItemNode" ItemsSource="{Binding Children,Mode=TwoWay}"> <Grid Background="Transparent"> <Grid.Resources> <convert:BoolToVisible x:Key="boolToVisible"/> <convert:VisibleToReverse x:Key="visibleToReverse"/> </Grid.Resources> <Grid MinHeight="30" x:Name="userinfo" Background="Transparent" Margin="-5 0 0 0" Visibility="{Binding Visibility,ElementName=groupinginfo,Converter={StaticResource visibleToReverse}}"> <Grid Height="50" x:Name="grid"> <Border Background="#62acf9" Width="40" Height="40" CornerRadius="4" HorizontalAlignment="Left" Margin="0 0 0 0"> <TextBlock Text="{Binding SurName}" FontSize="23" Foreground="White" VerticalAlignment="Center" HorizontalAlignment="Center"/> </Border> <TextBlock Text="{Binding Name}" Margin="50 7 0 0" FontSize="13"/> <TextBlock Text="{Binding Info}" Foreground="#808080" Margin="50 30 0 0"/> <TextBlock Text="{Binding Count,StringFormat={}{0}人}" Foreground="#808080" HorizontalAlignment="Right" VerticalAlignment="Center" Margin="0 0 5 0"/> </Grid> </Grid> <StackPanel MinHeight="25" x:Name="groupinginfo" Orientation="Horizontal" Background="Transparent" HorizontalAlignment="Left" Visibility="{Binding IsGrouping,Converter={StaticResource boolToVisible}}"> <TextBlock Text="{Binding DisplayName}" Margin="3 0" VerticalAlignment="Center" HorizontalAlignment="Left"/> </StackPanel> </Grid> </HierarchicalDataTemplate>
TreeViewItem样式代码
<Style x:Key="DefaultTreeViewItem" TargetType="{x:Type TreeViewItem}"> <Setter Property="MinHeight" Value="25" /> <Setter Property="Background" Value="Transparent" /> <Setter Property="SnapsToDevicePixels" Value="True" /> <Setter Property="Margin" Value="0" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type TreeViewItem}"> <ControlTemplate.Resources> <convert:IndentConverter x:Key="indentConverter"/> </ControlTemplate.Resources> <Grid Background="Transparent"> <Grid.RowDefinitions> <RowDefinition/> <RowDefinition/> </Grid.RowDefinitions> <Border Name="itemBackground" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}"> <Grid Background="Transparent"> <Grid x:Name="ItemRoot" Margin="{Binding Converter={StaticResource indentConverter},RelativeSource={RelativeSource TemplatedParent}}" Background="Transparent"> <Grid.ColumnDefinitions> <ColumnDefinition Width="16" /> <ColumnDefinition Width="*"/> </Grid.ColumnDefinitions> <ToggleButton x:Name="Expander" HorizontalAlignment="Left" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}"> <ToggleButton.Style> <Style TargetType="{x:Type ToggleButton}"> <Setter Property="Focusable" Value="False"/> <Setter Property="Width" Value="16"/> <Setter Property="Height" Value="16"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ToggleButton}"> <Border Background="Transparent" Height="16" Padding="5" Width="16"> <Path x:Name="ExpandPath" Data="M0,0 L0,6 L6,0 z" Fill="#66645e" Stroke="#66645e"> <Path.RenderTransform> <RotateTransform Angle="135" CenterY="3" CenterX="3"/> </Path.RenderTransform> </Path> </Border> <ControlTemplate.Triggers> <Trigger Property="IsChecked" Value="True"> <Setter Property="RenderTransform" TargetName="ExpandPath"> <Setter.Value> <RotateTransform Angle="180" CenterY="3" CenterX="3"/> </Setter.Value> </Setter> <Setter Property="Fill" TargetName="ExpandPath" Value="#66645e"/> <Setter Property="Stroke" TargetName="ExpandPath" Value="#66645e"/> </Trigger> <Trigger Property="IsMouseOver" Value="True"> <Setter Property="Stroke" TargetName="ExpandPath" Value="#66645e"/> <Setter Property="Fill" TargetName="ExpandPath" Value="#66645e"/> </Trigger> <MultiTrigger> <MultiTrigger.Conditions> <Condition Property="IsMouseOver" Value="True"/> <Condition Property="IsChecked" Value="True"/> </MultiTrigger.Conditions> <Setter Property="Stroke" TargetName="ExpandPath" Value="#66645e"/> <Setter Property="Fill" TargetName="ExpandPath" Value="#66645e"/> </MultiTrigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> </ToggleButton.Style> </ToggleButton> <ContentPresenter Grid.Column="1" x:Name="PART_Header" ContentSource="Header" HorizontalAlignment="Stretch" > </ContentPresenter> </Grid> </Grid> </Border> <ItemsPresenter x:Name="ItemsHost" Grid.Row="1"/> </Grid> <ControlTemplate.Triggers> <DataTrigger Binding="{Binding IsGrouping}" Value="false"> <Setter Property="Visibility" TargetName="Expander" Value="Hidden"/> </DataTrigger> <Trigger Property="HasItems" Value="False"> <Setter Property="Visibility" TargetName="Expander" Value="Collapsed"/> </Trigger> <Trigger Property="IsExpanded" Value="False"> <Setter Property="Visibility" TargetName="ItemsHost" Value="Collapsed"/> </Trigger> <Trigger Property="IsSelected" Value="True"> <Setter Property="Background" TargetName="itemBackground" Value="#FAE388"/> </Trigger> <MultiTrigger> <MultiTrigger.Conditions> <Condition Property="IsFocused" Value="False"/> <Condition SourceName="itemBackground" Property="IsMouseOver" Value="true"/> </MultiTrigger.Conditions> <Setter Property="Background" Value=" #fceeb9" TargetName="itemBackground"/> </MultiTrigger> <Trigger Property="IsEnabled" Value="False"> <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style>
TreeView样式代码
<Style x:Key="DefaultTreeView" TargetType="{x:Type TreeView}"> <Setter Property="ScrollViewer.CanContentScroll" Value="True" /> <Setter Property="VirtualizingStackPanel.IsVirtualizing" Value="True"></Setter> <Setter Property="VirtualizingStackPanel.VirtualizationMode" Value="Recycling" /> <Setter Property="ScrollViewer.IsDeferredScrollingEnabled" Value="False" /> <Setter Property="ItemContainerStyle" Value="{StaticResource DefaultTreeViewItem}"></Setter> <Setter Property="Padding" Value="0"/> <Setter Property="ItemsPanel"> <Setter.Value> <ItemsPanelTemplate> <VirtualizingStackPanel IsItemsHost="True" Margin="0"/> </ItemsPanelTemplate> </Setter.Value> </Setter> </Style>
2.3、转换器代码
public class IndentConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { double colunwidth = 10; double left = 0.0; UIElement element = value as TreeViewItem; while (element.GetType() != typeof(TreeView)) { element = (UIElement)VisualTreeHelper.GetParent(element); if (element.GetType() == typeof(TreeViewItem)) left += colunwidth; } return new Thickness(left, 0, 0, 0); } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } } public class BoolToVisible : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { if ((bool)value) return Visibility.Visible; else return Visibility.Collapsed; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } } public class VisibleToReverse : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { if ((Visibility)value == Visibility.Visible) return Visibility.Collapsed; else return Visibility.Visible; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } }
2.4、引用示例
<TreeView x:Name="TreeViewOrg" BorderThickness="1" BorderBrush="#BBB" Background="Transparent" Width="280" Height="500" Margin="10" ItemTemplate="{StaticResource ItemNode}" Style="{StaticResource DefaultTreeView}"> </TreeView>
2.5、初始化数据源及绑定对象
public MainWindow() { InitializeComponent(); OrgList = new ObservableCollection<OrgModel>() { new OrgModel() { IsGrouping=true, DisplayName="单位名称(3/7)", Children=new ObservableCollection<OrgModel>() { new OrgModel(){ IsGrouping=true, DisplayName="未分组联系人(2/4)", Children=new ObservableCollection<OrgModel>() { new OrgModel(){ IsGrouping=false, SurName="刘", Name="刘棒", Info="我要走向天空！", Count=3 } } } }, } }; TreeViewOrg.ItemsSource = OrgList; } public ObservableCollection<OrgModel> OrgList { get; set; } public class OrgModel { public bool IsGrouping { get; set; } public ObservableCollection<OrgModel> Children { get; set; } public string DisplayName { get; set; } public string SurName { get; set; } public string Name { get; set; } public string Info { get; set; } public int Count { get; set; } }
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