WPF自定义TreeView控件样式实现QQ联系人列表效果

一、前言

TreeView这个控件对于我来说是用得比较多的，以前做的小聊天软件(好友列表)、音乐播放器(播放列表)、类库展示器(树形类结构)等都用的是TreeView，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; }
  }

总结

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