WPF之TreeList的重写实现
2021-03-15 12:33
阅读：256
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
{
///
/// hierarchy
///
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
?
/// ///
///
///
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
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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">
TargetType="{x:Type ToggleButton}">
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"/>
Converter={StaticResource LevelToIndentConverter},RelativeSource={RelativeSource AncestorType={x:Type l:TreeListViewItem}}}"
IsChecked="{Binding Path=IsExpanded,RelativeSource={RelativeSource AncestorType={x:Type l:TreeListViewItem}}}" ClickMode="Press"/>
>
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Padding="{TemplateBinding Padding}">
Content="{TemplateBinding Header}"
Columns="{StaticResource gvcc}" />
>
DataContext="{Binding}" >
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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
{ ///
/// MainWindow.xaml 的交互逻辑
///
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 ObservableCollectionnew ObservableCollection
public ObservableCollection
{
get { return _children; }
}
}
} |
最后给代码下载 TreeViewListDemoT.rar
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