WPF之TreeList的实现方法1
WPF之TreeList的实现方法(一)
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;
}
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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;
}
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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: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>
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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; }
}
}
}
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最后给代码下载 TreeViewListDemoT.rar