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WPF之TreeList的实现方法(一)

2017-09-06 1297
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简介：

做项目的时候根据需求，WPF现有的控件不能完全满足我们的需求，

很多时候我们需要对现有的控件做一下加工。

最简单的我们可能会把Tree转换成List形式有的叫Grid形式就像下图一样

今天我先做一个完全用样式加工的例子，有时间我再把它做深加工写成一下通能形式

我们要先把treeView重写一下

public  class  TreeListView : TreeView
     {
         //这两个默认的是TreeViewItem
         protected  override  DependencyObject GetContainerForItemOverride() //创建或标识用于显示指定项的元素。
         {
             return  new  TreeListViewItem();
         }
 
         protected  override  bool  IsItemItsOwnContainerOverride( object  item) //确定指定项是否是（或可作为）其自己的 ItemContainer
         {
             //return item is TreeListViewItem;
             bool  _isTreeLVI = item is  TreeListViewItem;
             return  _isTreeLVI;
         }
     }
 
     public  class  TreeListViewItem : TreeViewItem
     {
         /// <summary>
         /// hierarchy
         /// </summary>
         public  int  Level
         {
             get
             {
                 if  (_level == -1)
                 {
                     TreeListViewItem parent =
                         ItemsControl.ItemsControlFromItemContainer( this ) as  TreeListViewItem; //返回拥有指定的容器元素中 ItemsControl 。
                     _level = (parent != null ) ? parent.Level + 1 : 0;
                 }
                 return  _level;
             }
         }
 
 
         protected  override  DependencyObject GetContainerForItemOverride()
         {
             return  new  TreeListViewItem();
         }
 
         protected  override  bool  IsItemItsOwnContainerOverride( object  item)
         {
             //return item is TreeListViewItem;
             bool  _isITV = item is  TreeListViewItem;
             return  _isITV;
         }
 
         private  int  _level = -1;
     }

上边是对TreeView的重写，因为TreeView是有层级关系的我们做的重写就把它的层级返回来

我们还要有一个列宽的转换

/// <summary>
     /// 
     /// 
     /// </summary>
     public  class  LevelToIndentConverter : IValueConverter
     {
         public  object  Convert( object  o, Type type, object  parameter, CultureInfo culture)
         {
             return  new  Thickness(( int )o * c_IndentSize, 0, 0, 0);
         }
 
         public  object  ConvertBack( object  o, Type type, object  parameter, CultureInfo culture)
         {
             throw  new  NotSupportedException();
         }
 
         private  const  double  c_IndentSize = 25.0;
     }

 

下边是样式和使用方法

我们是把TreeView的样式加上了GridViewColumnCollection实现 的这个TreeView和ListView一样有标头和列

前台页面

<Window x:Class= "TreeViewListDemoT.MainWindow"
         xmlns= "http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x= "http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:l= "clr-namespace:TreeViewListDemoT"
         Title= "MainWindow"  Height= "350"  Width= "525" >
     <Window.Resources>
         
         <Style x:Key= "ExpandCollapseToggleStyle"  TargetType= "{x:Type ToggleButton}" >
             <Setter Property= "Focusable"   Value= "False" />
             <Setter Property= "Width"       Value= "19" />
             <Setter Property= "Height"      Value= "13" />
             <Setter Property= "Template" >
                 <Setter.Value>
                     <ControlTemplate TargetType= "{x:Type ToggleButton}" >
                         <Border Width= "19"   Height= "13"   Background= "Transparent" >
                             <Border Width= "9"  Height= "9"    BorderThickness= "1"     BorderBrush= "#FF7898B5"    CornerRadius= "1"   SnapsToDevicePixels= "true" >
                                 <Border.Background>
                                     <LinearGradientBrush StartPoint= "0,0"   EndPoint= "1,1" >
                                         <LinearGradientBrush.GradientStops>
                                             <GradientStop Color= "White"      Offset= ".2" />
                                             <GradientStop Color= "#FFC0B7A6"  Offset= "1" />
                                         </LinearGradientBrush.GradientStops>
                                     </LinearGradientBrush>
                                 </Border.Background>
                                 <Path x:Name= "ExpandPath"  Margin= "1,1,1,1"  Fill= "Black"
                       Data= "M 0 2 L 0 3 L 2 3 L 2 5 L 3 5 L 3 3 L 5 3 L 5 2 L 3 2 L 3 0 L 2 0 L 2 2 Z" />
                             </Border>
                         </Border>
                         <ControlTemplate.Triggers>
                             <Trigger Property= "IsChecked"  Value= "True" >
                                 <Setter Property= "Data"  TargetName= "ExpandPath"  Value= "M 0 2 L 0 3 L 5 3 L 5 2 Z" />
                             </Trigger>
                         </ControlTemplate.Triggers>
                     </ControlTemplate>
                 </Setter.Value>
             </Setter>
         </Style>
         <l:LevelToIndentConverter x:Key= "LevelToIndentConverter" />
 
         <DataTemplate x:Key= "CellTemplate_Name" >
             <DockPanel>
                 <ToggleButton x:Name= "Expander"  Style= "{StaticResource ExpandCollapseToggleStyle}"  Margin="{Binding Level,
                              Converter={StaticResource LevelToIndentConverter},RelativeSource={RelativeSource AncestorType={x:Type l:TreeListViewItem}}}"
                              IsChecked= "{Binding Path=IsExpanded,RelativeSource={RelativeSource AncestorType={x:Type l:TreeListViewItem}}}"  ClickMode= "Press" />
                 <TextBlock Text= "{Binding Name}" />
             </DockPanel>
             <DataTemplate.Triggers>
                 <DataTrigger Binding= "{Binding Path=HasItems,RelativeSource={RelativeSource AncestorType={x:Type l:TreeListViewItem}}}"  Value= "False" >
                     <Setter TargetName= "Expander"  Property= "Visibility"  Value= "Hidden" />
                 </DataTrigger>
             </DataTemplate.Triggers>
         </DataTemplate>
 
         <GridViewColumnCollection x:Key= "gvcc" >
             <GridViewColumn Header= "Name"  CellTemplate= "{StaticResource CellTemplate_Name}"  />
             <GridViewColumn Header= "Age"       DisplayMemberBinding= "{Binding Age}"  Width= "60"  />
             <GridViewColumn Header= "Sex"       DisplayMemberBinding= "{Binding Sex}"  Width= "60" />
         </GridViewColumnCollection>
 
         <Style TargetType= "{x:Type l:TreeListViewItem}" >
             <Setter Property= "Template" >
                 <Setter.Value>
                     <ControlTemplate TargetType= "{x:Type l:TreeListViewItem}" >
                         <StackPanel>
                             <Border Name= "Bd"
                               Background= "{TemplateBinding Background}"
                               BorderBrush= "{TemplateBinding BorderBrush}"
                               BorderThickness= "{TemplateBinding BorderThickness}"
                               Padding= "{TemplateBinding Padding}" >
                                 <GridViewRowPresenter x:Name= "PART_Header"
                                       Content= "{TemplateBinding Header}"
                                       Columns= "{StaticResource gvcc}"  />
                             </Border>
                             
                             <ItemsPresenter x:Name= "ItemsHost"  />
                         </StackPanel>
                         <ControlTemplate.Triggers>
                             <Trigger Property= "IsExpanded"  Value= "false" >
                                 <Setter TargetName= "ItemsHost"  Property= "Visibility"                Value= "Collapsed" />
                             </Trigger>
                             <MultiTrigger>
                                 <MultiTrigger.Conditions>
                                     <Condition Property= "HasHeader"    Value= "false" />
                                     <Condition Property= "Width"        Value= "Auto" />
                                 </MultiTrigger.Conditions>
                                 <Setter TargetName= "PART_Header"  Property= "MinWidth"  Value= "75" />
                             </MultiTrigger>
                             <MultiTrigger>
                                 <MultiTrigger.Conditions>
                                     <Condition Property= "HasHeader"  Value= "false" />
                                     <Condition Property= "Height"     Value= "Auto" />
                                 </MultiTrigger.Conditions>
                                 <Setter TargetName= "PART_Header"  Property= "MinHeight"  Value= "19" />
                             </MultiTrigger>
                             <Trigger Property= "IsSelected"   Value= "true" >
                                 <Setter TargetName= "Bd"  Property= "Background"  Value= "{DynamicResource {x:Static SystemColors.HighlightBrushKey}}" />
                                 <Setter Property= "Foreground"   Value= "{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}" />
                             </Trigger>
                             <MultiTrigger>
                                 <MultiTrigger.Conditions>
                                     <Condition Property= "IsSelected"  Value= "true" />
                                     <Condition Property= "IsSelectionActive"  Value= "false" />
                                 </MultiTrigger.Conditions>
                                 <Setter TargetName= "Bd"  Property= "Background"  Value= "{DynamicResource {x:Static SystemColors.ControlBrushKey}}" />
                                 <Setter Property= "Foreground"  Value= "{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" />
                             </MultiTrigger>
                             <Trigger Property= "IsEnabled"  Value= "false" >
                                 <Setter Property= "Foreground"   Value= "{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
                             </Trigger>
                         </ControlTemplate.Triggers>
                     </ControlTemplate>
                 </Setter.Value>
             </Setter>
         </Style>
 
         <Style TargetType= "{x:Type l:TreeListView}" >
             <Setter Property= "Template" >
                 <Setter.Value>
                     <ControlTemplate TargetType= "{x:Type l:TreeListView}" >
                         <Border BorderBrush= "{TemplateBinding BorderBrush}"  BorderThickness= "{TemplateBinding BorderThickness}" >
                             <DockPanel>
                                 <GridViewHeaderRowPresenter Columns= "{StaticResource gvcc}"  DockPanel.Dock= "Top" />
                                 <Border BorderThickness= "2" >
                                 <ItemsPresenter/>
                                 </Border>
                             </DockPanel>
                         </Border>
                     </ControlTemplate>
                 </Setter.Value>
             </Setter>
         </Style>
         
         
     </Window.Resources>
     <Grid>
         <l:TreeListView x:Name= "_list"  ItemsSource= "{Binding Children}"   BorderThickness= "2" >
             <l:TreeListView.ItemTemplate >
                 <HierarchicalDataTemplate ItemsSource= "{Binding Children}"  >
                     <Border BorderThickness= "2"  BorderBrush= "Yellow"  CornerRadius= "0"  Margin= "1"   x:Name= "back"  MinWidth= "70"
                                 DataContext= "{Binding}"  >
                         <StackPanel Orientation= "Horizontal"  Margin= "2" >
                             <TextBlock Text= "{Binding Text}"  Margin= "2 0" />
                         </StackPanel>
                     </Border>
                 </HierarchicalDataTemplate>
                 
             </l:TreeListView.ItemTemplate>
             
         </l:TreeListView>
     </Grid>
</Window>

 后台代码

using  System;
using  System.Collections.Generic;
using  System.Collections.ObjectModel;
using  System.ComponentModel;
using  System.Linq;
using  System.Text;
using  System.Threading.Tasks;
using  System.Windows;
using  System.Windows.Controls;
using  System.Windows.Data;
using  System.Windows.Documents;
using  System.Windows.Input;
using  System.Windows.Media;
using  System.Windows.Media.Imaging;
using  System.Windows.Navigation;
using  System.Windows.Shapes;
 
namespace  TreeViewListDemoT
{
     /// <summary>
     /// MainWindow.xaml 的交互逻辑
     /// </summary>
     public  partial  class  MainWindow : Window
     {
         public  MainWindow()
         {
             InitializeComponent();
             ObjForTest root = new  ObjForTest();
             ObjForTest depart = new  ObjForTest( "Department" , null , "" );
             ObjForTest c1 = new  ObjForTest( "li" , 45, "M" );
             ObjForTest c2 = new  ObjForTest( "xu" , 30, "W" );
             ObjForTest c3 = new  ObjForTest( "zhang" , 22, "M" );
             ObjForTest cc1 = new  ObjForTest( "shen" , 30, "M" );
             ObjForTest cc2 = new  ObjForTest( "zhao" , 18, "W" );
             ObjForTest cc3 = new  ObjForTest( "wang" , 32, "M" );
             ObjForTest ccc1 = new  ObjForTest( "qian" , 20, "W" );
             root.Children.Add(depart);
             depart.Children.Add(c1);
             depart.Children.Add(c2);
             depart.Children.Add(c3);
             c1.Children.Add(cc1);
             c2.Children.Add(cc2);
             c3.Children.Add(cc3);
             cc1.Children.Add(ccc1);
             this ._list.ItemsSource = root.Children;
         }
     }
 
     public  class  ObjForTest
     {
         public  ObjForTest() { }
         public  ObjForTest( string  name, int ? age, string  sex)
         {
             
             this ._sex = sex;
             this ._age = age;
             this ._name = name;
             
         }
         private  string  _name;
         private  int ? _age;
         private  string  _sex;
        
 
         public  string  Sex
         {
             get  { return  this ._sex; }
             set  { this ._sex = value; }
         }
         public  int ? Age
         {
             get  { return  this ._age; }
             set  { this ._age = value; }
         }
       
         public  string  Name
         {
             get  { return  _name; }
             set
             {
                 _name = value;
 
             }
         }
 
         private  ObservableCollection<ObjForTest> _children = new  ObservableCollection<ObjForTest>();
         public  ObservableCollection<ObjForTest> Children
         {
             get  { return  _children; }
         }
 
 
      
     }
}

 

 最后给代码下载 TreeViewListDemoT.rar

 本文转自lpxxn博客园博客，原文链接：http://www.cnblogs.com/li-peng/p/3309600.html，如需转载请自行联系原作者

文章标签：
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C#
关键词：
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