一、前言
TreeView控件在項目中使用比較頻繁，普通的TreeView并不能滿足我們的需求。是以我們需要滴對TreeView進行改造。下面的内容将介紹仿QQ聯系人TreeView樣式及TreeView資料綁定方法。
二、TreeView仿QQ聯系人清單
準确的說不是仿QQ聯系人清單，這個TreeView樣式作為組織架構來使用更好。廢話不多說，先看效果：
2.1、基本思路
像這種聯系人清單一般涉及到多層級資料，而且有很多資料是需要動态更新的，如果通過手動一條條增加資料反而更複雜，而且不友善。是以為了綁定資料友善我們使用分層模闆HierarchicalDataTemplate。
分層模闆中存在兩種樣式，一種是分組樣式，一種是人員樣式。不管是分組還是人員綁定的都是對象，這樣我們在對象中添加一個屬性來辨識是否為分組-IsGrouping。
預設的TreeView控件四周會有邊距，是以需要設定下TreeView的樣式。另外滑鼠經過和滑鼠選中的背景色需要變化，是以還需要設定TreeViewItem的樣式。
根據思路，我們需要設定三個樣式，TreeView樣式，TreeViewItem樣式，HierarchicalDataTemplate分層模闆樣式。另外為了自動計算下一級的邊距，我們需要添加一個轉換器IndentConverter。還需要一個轉換器需要将布爾類型的IsGrouping轉換為Visibility，還需要一個轉換器來對Visibility取反。
這樣三個樣式，三個轉換器。就可以實作我們上面的效果，另外還可以進行動态資料綁定。
2.2、樣式代碼
HierarchicalDataTemplate分層模闆樣式代碼
<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樣式代碼
<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樣式代碼
<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、轉換器代碼
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、初始化資料源及綁定對象
public MainWindow()
{
InitializeComponent();
OrgList = new ObservableCollection<OrgModel>()
{
new OrgModel()
{
IsGrouping=true,
DisplayName="機關名稱(3/7)",
Children=new ObservableCollection<OrgModel>()
{
new OrgModel(){
IsGrouping=true,
DisplayName="未分組聯系人(2/4)",
Children=new ObservableCollection<OrgModel>()
{
new OrgModel(){
IsGrouping=false,
SurName="劉",
Name="劉棒",
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; }
} 所有代碼已經上傳到github：https://github.com/cmfGit/WpfDemo.git
作者：一葉知秋
出處：http://www.cnblogs.com/xiaomingg/
GitHub：https://github.com/caomfan/
本文版權歸作者和部落格園共有，歡迎轉載，但未經作者同意必須在文章頁面給出原文連接配接，否則保留追究法律責任的權利。
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