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添加项目文件。

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2024-09-22 11:05:41 +08:00
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Wpf.Ui.Extend/Controls/MultiTreeView/MultiTreeView.xaml.cs Normal file
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using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media;
using Wpf.Ui.Extend.Extensions;
namespace Wpf.Ui.Extend.Controls;
/// <summary>
/// 多选树形视图控件。
/// </summary>
public sealed class MultiTreeView : TreeView
{
// public static readonly DependencyPropertyKey SelectedItemsPropertyKey =
// DependencyProperty.RegisterReadOnly(
//nameof(SelectedItems),
// typeof(IList),
// typeof(MultiTreeViewItem),
// new FrameworkPropertyMetadata(null)
// );
// public static readonly DependencyProperty SelectedItemsProperty = SelectedItemsPropertyKey.DependencyProperty;
// public IList SelectedItems
// {
// get { return (IList)GetValue(SelectedItemsProperty); }
// private set { SetValue(SelectedItemsPropertyKey, value); }
// }
public IList SelectedItems
{
get { return (IList)GetValue(SelectedItemsProperty); }
set { SetValue(SelectedItemsProperty, value); }
}
public static readonly DependencyProperty SelectedItemsProperty =
DependencyProperty.Register(nameof(SelectedItems), typeof(IList), typeof(MultiTreeView), new PropertyMetadata(null, new PropertyChangedCallback(OnSelectedItemsChanged)));
private static void OnSelectedItemsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var list = e.NewValue as IList;
//foreach (var item in list)
//{
//}
}
#region Event Handlers
/// <summary>
/// 在鼠标按下事件发生时调用。
/// </summary>
//protected override void OnPreviewMouseDown(MouseButtonEventArgs e)
//{
// base.OnPreviewMouseDown(e);
// //// 如果点击树分支expander
// //if (e.OriginalSource is Grid or Border or TextBlock)
// // return;
// var obj = e.OriginalSource as DependencyObject;
// var checkBox = obj.FindParent<CheckBox>();
// if (checkBox != null)
// {
// //当前点击的MultiTreeViewItem
// var currentItem = GetTreeViewItemClicked((FrameworkElement)e.OriginalSource);
// if (currentItem != null)
// {
// SelectedItems = GetTreeViewItems(this, true).Where(d => d.IsChecked == true).ToList();
// }
// }
//}
#endregion Event Handlers
#region Utility Methods
#region 重写
///// <summary>
///// 准备项的容器
///// </summary>
///// <param name="element">控件元素</param>
///// <param name="item">绑定的对象</param>
//protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
//{
// if (item is not MultiTreeViewItem)
// {
// if (element is MultiTreeViewItem multiTreeViewItem && !string.IsNullOrEmpty(this.DisplayMemberPath))
// {
// var binding = new Binding(this.DisplayMemberPath);
// multiTreeViewItem.SetBinding(MultiTreeViewItem.HeaderProperty, binding);
// }
// }
// base.PrepareContainerForItemOverride(element, item);
//}
/// <summary>
/// 获取项的容器。
/// </summary>
protected override DependencyObject GetContainerForItemOverride()
{
return new MultiTreeViewItem();
}
/// <summary>
/// 确定项是否是其自己的容器。
/// </summary>
protected override bool IsItemItsOwnContainerOverride(object item)
{
return item is MultiTreeViewItem;
}
#endregion
/// <summary>
/// 获取当前被点击的MultiTreeViewItem。
/// </summary>
private static MultiTreeViewItem GetTreeViewItemClicked(DependencyObject sender)
{
while (sender is not null and not MultiTreeViewItem)
sender = VisualTreeHelper.GetParent(sender);
return sender as MultiTreeViewItem;
}
/// <summary>
/// 获取树形视图的所有展开的项。
/// </summary>
private List<MultiTreeViewItem> GetTreeViewItems(ItemsControl parentItem, bool includeCollapsedItems, List<MultiTreeViewItem> itemList = null)
{
itemList ??= [];
for (var index = 0; index < parentItem.Items.Count; index++)
{
if (parentItem.ItemContainerGenerator.ContainerFromIndex(index) is not MultiTreeViewItem tvItem)
{
continue;
}
itemList.Add(tvItem);
if (includeCollapsedItems || tvItem.IsExpanded)
{
GetTreeViewItems(tvItem, includeCollapsedItems, itemList);
}
}
return itemList;
}
internal void NotifyMultiTreeViewItemClicked(MultiTreeViewItem multiTreeViewItem)
{
var selectedItems = GetTreeViewItems(this, true).Where(d => d.IsChecked == true);
if (ItemsSource==null)
{
SelectedItems = selectedItems.ToList();
}
else
{
//选择绑定的对象
SelectedItems = selectedItems.Select(d => d.DataContext).ToList();
}
}
///// <summary>
///// 获取两个树形视图项之间的所有项。
///// </summary>
//private List<MultiTreeViewItem> GetTreeViewItemRange(MultiTreeViewItem start, MultiTreeViewItem end)
//{
// var items = GetTreeViewItems(this, false);
// var startIndex = items.IndexOf(start);
// var endIndex = items.IndexOf(end);
// var rangeStart = startIndex > endIndex || startIndex == -1 ? endIndex : startIndex;
// var rangeCount = startIndex > endIndex ? startIndex - endIndex + 1 : endIndex - startIndex + 1;
// if (startIndex == -1 && endIndex == -1)
// rangeCount = 0;
// else if (startIndex == -1 || endIndex == -1)
// rangeCount = 1;
// return rangeCount > 0 ? items.GetRange(rangeStart, rangeCount) : new List<MultiTreeViewItem>();
//}
#endregion Utility Methods
static MultiTreeView()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(MultiTreeView), new FrameworkPropertyMetadata(typeof(MultiTreeView)));
}
/// <summary>
/// 初始化 MultiTreeView 类的新实例。
/// </summary>
//public MultiTreeView()
//{
//SelectedItemChanged += (sender, e) =>
//{
// if (e.NewValue is MultiTreeViewItem item)
// SelectedItemChangedInternal(item);
//};
//}
}