Seaching TreeVIew WPF

2021-06-28 19:05

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原文:Seaching TreeVIew WPF

项目中有一个树形结构的资源，需要支持搜索功能，搜索出来的结果还是需要按照树形结构展示，下面是简单实现的demo。

1.首先创建TreeViewItem的ViewModel，一般情况下，树形结构都包含DisplayName，Deepth，Parent，Children，Id， IndexCode，Visibility等属性，具体代码如下所示：

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Collections.ObjectModel;
  4 using System.Linq;
  5 using System.Text;
  6 using System.Threading.Tasks;
  7 using System.Windows;
  8 
  9 namespace TreeViewDemo
 10 {
 11     public class TreeViewItemVM : NotifyPropertyChangedBase
 12     {
 13         public TreeViewItemVM ()
 14         {
 15             Visible = Visibility.Visible;
 16         }
 17 
 18         private TreeViewItemVM parent;
 19         public TreeViewItemVM Parent
 20         {
 21             get
 22             {
 23                 return this.parent;
 24             }
 25             set
 26             {
 27                 if (this.parent != value)
 28                 {
 29                     this.parent = value;
 30                     this.OnPropertyChanged(() => this.Parent);
 31                 }
 32             }
 33         }
 34 
 35         private ObservableCollection children;
 36         public ObservableCollection Children
 37         {
 38             get
 39             {
 40                 return this.children;
 41             }
 42             set
 43             {
 44                 if (this.children != value)
 45                 {
 46                     this.children = value;
 47                     this.OnPropertyChanged(() => this.Children);
 48                 }
 49             }
 50         }
 51 
 52         private string id;
 53         public string ID
 54         {
 55             get
 56             {
 57                 return this.id;
 58             }
 59             set
 60             {
 61                 if (this.id != value)
 62                 {
 63                     this.id = value;
 64                     this.OnPropertyChanged(() => this.ID);
 65                 }
 66             }
 67         }
 68 
 69         private string indexCode;
 70         public string IndexCode
 71         {
 72             get { return indexCode; }
 73             set
 74             {
 75                 if (indexCode != value)
 76                 {
 77                     indexCode = value;
 78                     this.OnPropertyChanged(() => IndexCode);
 79                 }
 80             }
 81         }
 82 
 83         private string displayName;
 84         public string DisplayName
 85         {
 86             get
 87             {
 88                 return this.displayName;
 89             }
 90             set
 91             {
 92                 if (this.displayName != value)
 93                 {
 94                     this.displayName = value;
 95                     this.OnPropertyChanged(() => this.DisplayName);
 96                 }
 97             }
 98         }
 99 
100         private int deepth;
101         public int Deepth
102         {
103             get
104             {
105                 return this.deepth;
106             }
107             set
108             {
109                 if (this.deepth != value)
110                 {
111                     this.deepth = value;
112                     this.OnPropertyChanged(() => this.Deepth);
113                 }
114             }
115         }
116 
117         private bool hasChildren;
118         public bool HasChildren
119         {
120             get
121             {
122                 return this.hasChildren;
123             }
124             set
125             {
126                 if (this.hasChildren != value)
127                 {
128                     this.hasChildren = value;
129                     this.OnPropertyChanged(() => this.HasChildren);
130                 }
131             }
132         }
133 
134         private NodeType type;
135         public NodeType Type
136         {
137             get { return type; }
138             set
139             {
140                 if (type != value)
141                 {
142                     type = value;
143                     OnPropertyChanged(() => this.Type);
144                 }
145             }
146         }
147 
148         private Visibility visible;
149         public Visibility Visible
150         {
151             get { return visible; }
152             set
153             {
154                 if (visible != value)
155                 {
156                     visible = value;
157                     OnPropertyChanged(() => this.Visible);
158                 }
159             }
160         }
161 
162         public bool NameContains(string filter)
163         {
164             if (string.IsNullOrWhiteSpace(filter))
165             {
166                 return true;
167             }
168 
169             return DisplayName.ToLowerInvariant().Contains(filter.ToLowerInvariant());
170         }
171     }
172 }

2.创建TreeViewViewModel，其中定义了用于过滤的属性Filter，以及过滤函数，并在构造函数中初始化一些测试数据，具体代码如下：

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Collections.ObjectModel;
  4 using System.ComponentModel;
  5 using System.Linq;
  6 using System.Text;
  7 using System.Threading.Tasks;
  8 using System.Windows.Data;
  9 
 10 namespace TreeViewDemo
 11 {
 12     public class TreeViewViewModel : NotifyPropertyChangedBase
 13     {
 14         public static TreeViewViewModel Instance = new TreeViewViewModel();
 15 
 16         private TreeViewViewModel()
 17         {
 18             Filter = string.Empty;
 19 
 20             Root = new TreeViewItemVM()
 21             {
 22                 Deepth = 0,
 23                 DisplayName = "五号线",
 24                 HasChildren = true,
 25                 Type = NodeType.Unit,
 26                 ID = "0",
 27                 Children = new ObservableCollection() { 
 28                     new TreeViewItemVM() { DisplayName = "站台", Deepth = 1, HasChildren = true, ID = "1", Type = NodeType.Region,
 29                         Children = new ObservableCollection(){
 30                             new TreeViewItemVM() { DisplayName = "Camera 01", Deepth = 2, HasChildren = false, ID = "3",Type = NodeType.Camera },
 31                             new TreeViewItemVM() { DisplayName = "Camera 02", Deepth = 2, HasChildren = false, ID = "4",Type = NodeType.Camera },
 32                             new TreeViewItemVM() { DisplayName = "Camera 03", Deepth = 2, HasChildren = false, ID = "5",Type = NodeType.Camera },
 33                             new TreeViewItemVM() { DisplayName = "Camera 04", Deepth = 2, HasChildren = false, ID = "6",Type = NodeType.Camera },
 34                             new TreeViewItemVM() { DisplayName = "Camera 05", Deepth = 2, HasChildren = false, ID = "7", Type = NodeType.Camera},
 35                         }},
 36                     new TreeViewItemVM() { DisplayName = "进出口", Deepth = 1, HasChildren = true, ID = "10", Type = NodeType.Region,
 37                         Children = new ObservableCollection(){
 38                             new TreeViewItemVM() { DisplayName = "Camera 11", Deepth = 2, HasChildren = false, ID = "13",Type = NodeType.Camera },
 39                             new TreeViewItemVM() { DisplayName = "Camera 12", Deepth = 2, HasChildren = false, ID = "14",Type = NodeType.Camera },
 40                             new TreeViewItemVM() { DisplayName = "Camera 13", Deepth = 2, HasChildren = false, ID = "15",Type = NodeType.Camera },
 41                             new TreeViewItemVM() { DisplayName = "Camera 14", Deepth = 2, HasChildren = false, ID = "16", Type = NodeType.Camera},
 42                             new TreeViewItemVM() { DisplayName = "Camera 15", Deepth = 2, HasChildren = false, ID = "17", Type = NodeType.Camera},
 43                         }},
 44                 }
 45             };
 46 
 47             InitTreeView();
 48         }
 49 
 50         private ObservableCollection selectedCameras = new ObservableCollection();
 51 
 52         private TreeViewItemVM root;
 53         public TreeViewItemVM Root
 54         {
 55             get
 56             {
 57                 return this.root;
 58             }
 59             set
 60             {
 61                 if (this.root != value)
 62                 {
 63                     this.root = value;
 64                     this.OnPropertyChanged(() => this.Root);
 65                 }
 66             }
 67         }
 68 
 69         /// 
 70         /// 过滤字段
 71         /// 
 72         private string filter;
 73         public string Filter
 74         {
 75             get
 76             {
 77                 return this.filter;
 78             }
 79             set
 80             {
 81                 if (this.filter != value)
 82                 {
 83 
 84                     this.filter = value;
 85                     this.OnPropertyChanged(() => this.Filter);
 86 
 87                     this.Refresh();
 88                 }
 89             }
 90         }
 91 
 92         /// 
 93         /// View
 94         /// 
 95         protected ICollectionView view;
 96         public ICollectionView View
 97         {
 98             get
 99             {
100                 return this.view;
101             }
102             set
103             {
104                 if (this.view != value)
105                 {
106                     this.view = value;
107                     this.OnPropertyChanged(() => this.View);
108                 }
109             }
110         }
111 
112         /// 
113         /// 刷新View
114         /// 
115         public void Refresh()
116         {
117             if (this.View != null)
118             {
119                 this.View.Refresh();
120             }
121         }
122 
123         private bool DoFilter(Object obj)
124         {
125             TreeViewItemVM item = obj as TreeViewItemVM;
126             if (item == null)
127             {
128                 return true;
129             }
130 
131             bool result = false;
132             foreach (var node in item.Children)
133             {
134                 result = TreeItemDoFilter(node) || result;
135             }
136 
137             return result || item.NameContains(this.Filter);
138         }
139 
140         private bool TreeItemDoFilter(TreeViewItemVM vm)
141         {
142             if (vm == null)
143             {
144                 return true;
145             }
146 
147             bool result = false;
148             if (vm.Type == NodeType.Region || vm.Type == NodeType.Unit)
149             {
150                 foreach (var item in vm.Children)
151                 {
152                     result = TreeItemDoFilter(item) || result;
153                 }
154             }
155 
156             if (result || vm.NameContains(this.Filter))
157             {
158                 result = true;
159                 vm.Visible = System.Windows.Visibility.Visible;
160             }
161             else
162             {
163                 vm.Visible = System.Windows.Visibility.Collapsed;
164             }
165 
166             return result;
167         }
168 
169         public void InitTreeView()
170         {
171             this.View = CollectionViewSource.GetDefaultView(this.Root.Children);
172             this.View.Filter = this.DoFilter;
173             this.Refresh();
174         }
175     }
176 }

3.在界面添加一个TreeView，并添加一个简单的Style，将ViewModel中必要数据进行绑定：

 1 "TreeViewDemo.MainWindow"
 2         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 3         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 4         Title="MainWindow" Height="450" Width="525">
 5      6         
23     24     25         26             "Auto"/>
27             "*"/>
28         29 
30         "searchTxt" Width="200" HorizontalAlignment="Center" Height="40"
31                  Margin="20" Text="{Binding Filter, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
32 
33         TreeView
34                   Grid.Row="1"
35                   ItemsSource="{Binding View}">
36             37                 "{StaticResource style}"  ItemsSource="{Binding Children}">
38                     "25" >
39                         TextBlock
40                             x:Name="txt"
41                             VerticalAlignment="Center"
42                             Text="{Binding DisplayName}"    
43                             TextTrimming="CharacterEllipsis"
44                             ToolTip="{Binding DisplayName}" />
45                     46                 47             48         
49     50

4.在给界面绑定具体的数据

 1 using System.Windows;
 2 
 3 namespace TreeViewDemo
 4 {
 5     /// 
 6     /// MainWindow.xaml 的交互逻辑
 7     /// 
 8     public partial class MainWindow : Window
 9     {
10         public MainWindow()
11         {
12             InitializeComponent();
13             this.Loaded += MainWindow_Loaded;
14         }
15 
16         void MainWindow_Loaded(object sender, RoutedEventArgs e)
17         {
18             this.DataContext = TreeViewViewModel.Instance;
19         }
20     }
21 }