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基于WPF实现筛选下拉多选控件

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基于WPF实现筛选下拉多选控件

2023-04-23 05:36| 来源: 网络整理| 查看: 265

基于WPF实现筛选下拉多选控件

WPF 实现筛选下拉多选控件

框架使用.NET4 至 .NET6；Visual Studio 2022;

创建MultiSelectionSearchComboBox继承Control.

模板中创建两个ListBox

PART_Selector用来显示所有ItemPART_SearchSelector用于记录筛选到的Item

Item继承ListBoxItem并将样式模板修改为CheckBox

解决Popup中IME不跟随TextBox问题

private static extern IntPtr SetFocus(IntPtr hWnd);

当TextBox中Text发生改变时通过循环Item中的GetProperty获取特定DisplayMemberPath属性，判断是否包含输入的SearchText值，如果包含则添加PART_SearchSelector中，当SelectionChanged事件更改时将修改PART_Selector中的内容。

实现代码

1）创建MultiSelectionSearchComboBox.cs代码如下:

using System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.Runtime.InteropServices; using System.Windows; using System.Windows.Controls; using System.Windows.Controls.Primitives; using System.Windows.Interop; namespace WPFDevelopers.Controls {     [TemplatePart(Name = "PART_TextBox", Type = typeof(TextBox))]     [TemplatePart(Name = "PART_Popup", Type = typeof(Popup))]     [TemplatePart(Name = "PART_Selector", Type = typeof(ListBox))]     [TemplatePart(Name = "PART_SelectAll", Type = typeof(CheckBox))]     [TemplatePart(Name = "PART_SearchSelector", Type = typeof(ListBox))]     public class MultiSelectionSearchComboBox : Control     {         private const string TextBoxTemplateName = "PART_TextBox";         private const string PopupTemplateName = "PART_Popup";         private const string ListBoxTemplateName = "PART_Selector";         private const string CheckBoxTemplateName = "PART_SelectAll";         private const string ListBoxTemplateNameSearch = "PART_SearchSelector";         public static readonly RoutedEvent ClosedEvent =             EventManager.RegisterRoutedEvent("Closed",                 RoutingStrategy.Bubble,                 typeof(RoutedEventHandler),                 typeof(MultiSelectionSearchComboBox));         public static readonly DependencyProperty DisplayMemberPathProperty =            DependencyProperty.Register("DisplayMemberPath",                typeof(string),                typeof(MultiSelectionSearchComboBox),                new PropertyMetadata(string.Empty));         public static readonly DependencyProperty SelectedValuePathProperty =            DependencyProperty.Register("SelectedValuePath",                typeof(string),                typeof(MultiSelectionSearchComboBox),                new PropertyMetadata(string.Empty));         public static readonly DependencyProperty TextProperty =             DependencyProperty.Register("Text",                 typeof(string),                 typeof(MultiSelectionSearchComboBox),                 new PropertyMetadata(string.Empty));         public static readonly DependencyProperty ItemsSourceProperty =             DependencyProperty.Register("ItemsSource", typeof(IEnumerable), typeof(MultiSelectionSearchComboBox),                 new PropertyMetadata());         public static readonly DependencyProperty ItemsSourceSearchProperty =             DependencyProperty.Register("ItemsSourceSearch", typeof(IEnumerable), typeof(MultiSelectionSearchComboBox),                 new PropertyMetadata());         public static readonly DependencyProperty SelectAllContentProperty =             DependencyProperty.Register("SelectAllContent", typeof(object), typeof(MultiSelectionSearchComboBox),                 new PropertyMetadata("全选"));         public static readonly DependencyProperty IsSelectAllActiveProperty =             DependencyProperty.Register("IsSelectAllActive", typeof(bool), typeof(MultiSelectionSearchComboBox),                 new PropertyMetadata(false));         public static readonly DependencyProperty DelimiterProperty =             DependencyProperty.Register("Delimiter", typeof(string), typeof(MultiSelectionSearchComboBox),                 new PropertyMetadata(";"));         public static readonly DependencyProperty IsDropDownOpenProperty =             DependencyProperty.Register("IsDropDownOpen", typeof(bool), typeof(MultiSelectionSearchComboBox),                 new PropertyMetadata(false, OnIsDropDownOpenChanged));         public static readonly DependencyProperty MaxDropDownHeightProperty =             DependencyProperty.Register("MaxDropDownHeight", typeof(double), typeof(MultiSelectionSearchComboBox),                 new UIPropertyMetadata(SystemParameters.PrimaryScreenHeight / 3.0, OnMaxDropDownHeightChanged));         public static readonly DependencyProperty SelectedItemsProperty =             DependencyProperty.Register("SelectedItems", typeof(IList), typeof(MultiSelectionSearchComboBox),                 new FrameworkPropertyMetadata(null,                     FrameworkPropertyMetadataOptions.BindsTwoWayByDefault | FrameworkPropertyMetadataOptions.Journal,                     OnSelectedItemsChanged));         public static readonly DependencyProperty SearchWatermarkProperty =            DependencyProperty.Register("SearchWatermark",                typeof(string),                typeof(MultiSelectionSearchComboBox),                new PropertyMetadata(string.Empty));         private CheckBox _checkBox;         private ListBox _listBox;         private ListBox _listBoxSearch;         private Popup _popup;         private TextBox _textBox;         private List selectedItems;         private List selectedList;         private List selectedSearchList;         private string theLastText;         static MultiSelectionSearchComboBox()         {             DefaultStyleKeyProperty.OverrideMetadata(typeof(MultiSelectionSearchComboBox),                 new FrameworkPropertyMetadata(typeof(MultiSelectionSearchComboBox)));         }         public string Delimiter         {             get => (string)GetValue(DelimiterProperty);             set => SetValue(DelimiterProperty, value);         }         public string SelectedValuePath         {             get => (string)GetValue(SelectedValuePathProperty);             set => SetValue(SelectedValuePathProperty, value);         }         public string DisplayMemberPath         {             get => (string)GetValue(DisplayMemberPathProperty);             set => SetValue(DisplayMemberPathProperty, value);         }         public string Text         {             get => (string) GetValue(TextProperty);             set => SetValue(TextProperty, value);         }         public IEnumerable ItemsSource         {             get => (IEnumerable)GetValue(ItemsSourceProperty);             set => SetValue(ItemsSourceProperty, value);         }         public IEnumerable ItemsSourceSearch         {             get => (IEnumerable) GetValue(ItemsSourceSearchProperty);             set => SetValue(ItemsSourceSearchProperty, value);         }         public object SelectAllContent         {             get => GetValue(SelectAllContentProperty);             set => SetValue(SelectAllContentProperty, value);         }         public bool IsSelectAllActive         {             get => (bool) GetValue(IsSelectAllActiveProperty);             set => SetValue(IsSelectAllActiveProperty, value);         }         public bool IsDropDownOpen         {             get => (bool) GetValue(IsDropDownOpenProperty);             set => SetValue(IsDropDownOpenProperty, value);         }         public double MaxDropDownHeight         {             get => (double) GetValue(MaxDropDownHeightProperty);             set => SetValue(MaxDropDownHeightProperty, value);         }         public IList SelectedItems         {             get => (IList) GetValue(SelectedItemsProperty);             set => SetValue(SelectedItemsProperty, value);         }         public string SearchWatermark         {             get => (string)GetValue(SearchWatermarkProperty);             set => SetValue(SearchWatermarkProperty, value);         }         [DllImport("User32.dll")]         private static extern IntPtr SetFocus(IntPtr hWnd);         public event RoutedEventHandler Closed         {             add => AddHandler(ClosedEvent, value);             remove => RemoveHandler(ClosedEvent, value);         }         public override void OnApplyTemplate()         {             base.OnApplyTemplate();             selectedList = new List();             selectedSearchList = new List();             selectedItems = new List();             _textBox = GetTemplateChild(TextBoxTemplateName) as TextBox;             _popup = GetTemplateChild(PopupTemplateName) as Popup;             if (_popup != null)                 _popup.GotFocus += _popup_GotFocus;             _listBox = GetTemplateChild(ListBoxTemplateName) as ListBox;             _checkBox = GetTemplateChild(CheckBoxTemplateName) as CheckBox;             _listBoxSearch = GetTemplateChild(ListBoxTemplateNameSearch) as ListBox;             if (_textBox != null)             {                 _textBox.TextChanged -= _textbox_TextChanged;                 _textBox.TextChanged += _textbox_TextChanged;             }             if (_checkBox != null)             {                 _checkBox.Checked -= _checkBox_Checked;                 _checkBox.Unchecked -= _checkBox_Unchecked;                 _checkBox.Checked += _checkBox_Checked;                 _checkBox.Unchecked += _checkBox_Unchecked;             }             if (_listBox != null)             {                 _listBox.IsVisibleChanged -= _listBox_IsVisibleChanged;                 _listBox.IsVisibleChanged += _listBox_IsVisibleChanged;                 _listBox.SelectionChanged -= _listBox_SelectionChanged;                 _listBox.SelectionChanged += _listBox_SelectionChanged;             }             if (_listBoxSearch != null)             {                 _listBoxSearch.IsVisibleChanged -= _listBoxSearch_IsVisibleChanged;                 _listBoxSearch.IsVisibleChanged += _listBoxSearch_IsVisibleChanged;                 _listBoxSearch.SelectionChanged -= _listBoxSearch_SelectionChanged;                 _listBoxSearch.SelectionChanged += _listBoxSearch_SelectionChanged;             }         }         private void _listBoxSearch_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)         {             if ((bool) e.NewValue)                 UpdateIsChecked(_listBoxSearch);         }         private void _listBox_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)         {             if ((bool) e.NewValue)             {                 foreach (var item in selectedSearchList)                     if (!_listBox.SelectedItems.Contains(item))                         _listBox.SelectedItems.Add(item);                 UpdateIsChecked(_listBox);             }         }         private void UpdateIsChecked(ListBox listBox)         {             _checkBox.Checked -= _checkBox_Checked;             if (listBox.Items.Count > 0 && listBox.Items.Count == listBox.SelectedItems.Count)             {                 if (_checkBox.IsChecked != true)                     _checkBox.IsChecked = true;             }             else             {                 if (listBox.SelectedItems.Count == 0)                     _checkBox.IsChecked = false;                 else                     _checkBox.IsChecked = null;             }             _checkBox.Checked += _checkBox_Checked;         }         private void _popup_GotFocus(object sender, RoutedEventArgs e)         {             var source = (HwndSource) PresentationSource.FromVisual(_popup.Child);             if (source != null)             {                 SetFocus(source.Handle);                 _textBox.Focus();             }         }         private void _checkBox_Unchecked(object sender, RoutedEventArgs e)         {             if (_listBoxSearch.Visibility == Visibility.Visible)                 _listBoxSearch.UnselectAll();             else                 _listBox.UnselectAll();         }         private void _checkBox_Checked(object sender, RoutedEventArgs e)         {             if (_listBoxSearch.Visibility == Visibility.Visible)                 _listBoxSearch.SelectAll();             else                 _listBox.SelectAll();         }         private void Combination()         {             var seletedName = new List();             foreach (var item in _listBox.SelectedItems)             {                 var name = GetDisplayText(item);                 seletedName.Add(name);             }             foreach (var item in _listBoxSearch.SelectedItems)             {                 if (_listBox.SelectedItems.Contains(item))                     continue;                 var name = GetDisplayText(item);                 seletedName.Add(name);             }             Text = string.Join(Delimiter, seletedName.ToArray());         }         private void _listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)         {             if (e.RemovedItems.Count > 0)                 foreach (var item in e.RemovedItems)                     if (_checkBox.IsChecked == true)                     {                         _checkBox.Unchecked -= _checkBox_Unchecked;                         if (_listBox.Items.Count == 1)                             _checkBox.IsChecked = false;                         else                             _checkBox.IsChecked = null;                         _checkBox.Unchecked += _checkBox_Unchecked;                     }             if (e.AddedItems.Count > 0)                 SelectionChecked(_listBox);             Combination();             SelectedItems = _listBox.SelectedItems;         }         private void _listBoxSearch_SelectionChanged(object sender, SelectionChangedEventArgs e)         {             if (!_listBoxSearch.IsVisible) return;             if (e.RemovedItems.Count > 0)             {                 foreach (var item in e.RemovedItems)                     if (selectedSearchList.Contains(item))                         selectedSearchList.Remove(item);                 Combination();                 SelectionChecked(_listBoxSearch);             }             if (e.AddedItems.Count > 0)             {                 foreach (var item in e.AddedItems)                     if (!selectedSearchList.Contains(item))                         selectedSearchList.Add(item);                 Combination();                 SelectionChecked(_listBoxSearch);             }         }         private void SelectionChecked(ListBox listbox)         {             if (listbox.SelectedItems.Count > 0                 &&                 listbox.Items.Count == listbox.SelectedItems.Count)             {                 _checkBox.Checked -= _checkBox_Checked;                 _checkBox.IsChecked = true;                 _checkBox.Checked += _checkBox_Checked;             }             else             {                 _checkBox.Checked -= _checkBox_Checked;                 if (listbox.SelectedItems.Count > 0                     &&                      listbox.Items.Count == listbox.SelectedItems.Count)                 {                     if (_checkBox.IsChecked != true)                         _checkBox.IsChecked = true;                 }                 else                 {                     if (listbox.SelectedItems.Count == 0)                         _checkBox.IsChecked = false;                     else                         _checkBox.IsChecked = null;                 }                 _checkBox.Checked += _checkBox_Checked;             }         }         private string GetDisplayText(object dataItem, string path = null)         {             if (dataItem == null) return string.Empty;             return GetPropertyValue(dataItem);         }         private void _textbox_TextChanged(object sender, TextChangedEventArgs e)         {             if (string.IsNullOrWhiteSpace(theLastText)) theLastText = _textBox.Text;             SearchText(_textBox.Text);         }         private void SearchText(string _text)         {             var text = _text;             if (string.IsNullOrWhiteSpace(text))             {                 if (_listBoxSearch.Visibility != Visibility.Collapsed)                     _listBoxSearch.Visibility = Visibility.Collapsed;                 if (_listBox.Visibility != Visibility.Visible)                     _listBox.Visibility = Visibility.Visible;             }             else             {                 if(_listBoxSearch.Visibility != Visibility.Visible)                     _listBoxSearch.Visibility = Visibility.Visible;                 if(_listBox.Visibility != Visibility.Collapsed)                     _listBox.Visibility = Visibility.Collapsed;                 var listSearch = new List();                 foreach (var item in _listBox.Items)                 {                     var str = GetPropertyValue(item);                     if (!string.IsNullOrWhiteSpace(str))                         if (str.Contains(text.ToUpperInvariant()))                             listSearch.Add(item);                 }                 foreach (var item in selectedList)                     if (!listSearch.Contains(item))                         listSearch.Add(item);                 var lastItem = ItemsSourceSearch;                 ItemsSourceSearch = listSearch;                 SelectionChecked(_listBoxSearch);                 selectedItems.Clear();                 foreach (var item in _listBoxSearch.Items)                     if (_listBox.SelectedItems.Contains(item))                         if (!_listBoxSearch.SelectedItems.Contains(item))                             _listBoxSearch.SelectedItems.Add(item);             }         }         private string GetPropertyValue(object item)         {             var result = string.Empty;             var nameParts = DisplayMemberPath.Split('.');             if (nameParts.Length == 1)             {                 var property = item.GetType().GetProperty(DisplayMemberPath);                 if (property != null)                     return (property.GetValue(item, null) ?? string.Empty).ToString();             }             return result.ToUpperInvariant();         }         private static void OnIsDropDownOpenChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)         {             var multiSelectionSearchComboBox = o as MultiSelectionSearchComboBox;             if (multiSelectionSearchComboBox != null)                 multiSelectionSearchComboBox.OnIsOpenChanged((bool) e.OldValue, (bool) e.NewValue);         }         protected virtual void OnIsOpenChanged(bool oldValue, bool newValue)         {             if (!newValue)                 RaiseRoutedEvent(ClosedEvent);         }         private void RaiseRoutedEvent(RoutedEvent routedEvent)         {             var args = new RoutedEventArgs(routedEvent, this);             RaiseEvent(args);         }         private static void OnMaxDropDownHeightChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)         {             var comboBox = o as MultiSelectionSearchComboBox;             if (comboBox != null)                 comboBox.OnMaxDropDownHeightChanged((double) e.OldValue, (double) e.NewValue);         }         protected virtual void OnMaxDropDownHeightChanged(double oldValue, double newValue)         {         }         private static void OnSelectedItemsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)         {             var mltiSelectionSearchComboBox = d as MultiSelectionSearchComboBox;             if (e.NewValue != null)             {                 var collection = e.NewValue as IList;                 if (collection.Count                          mltiSelectionSearchComboBox.GetPropertyValue(h).ToUpperInvariant()                             .Equals(name));                     if (model != null && !mltiSelectionSearchComboBox._listBox.SelectedItems.Contains(item))                         mltiSelectionSearchComboBox._listBox.SelectedItems.Add(model);                     if (e.OldValue != null && mltiSelectionSearchComboBox._listBox != null)                         mltiSelectionSearchComboBox._listBox.SelectionChanged +=                             mltiSelectionSearchComboBox._listBox_SelectionChanged;                     mltiSelectionSearchComboBox.Combination();                 }             }         }     } }

2）创建MultiSelectionListBox.xaml代码如下:

using System.Windows; using System.Windows.Controls; namespace WPFDevelopers.Controls {     public class MultiSelectionListBox:ListBox     {         protected override bool IsItemItsOwnContainerOverride(object item)         {             return item is MultiSelectComboBoxItem;         }         protected override DependencyObject GetContainerForItemOverride()         {             return new MultiSelectComboBoxItem();         }     } }

3）创建MultiSelectionSearchComboBox.xaml代码如下:

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

4）创建MultiSelectSearchComboBoxExample.xaml代码如下:

                                                                                                                                                                                                                                                                                                                       

5）创建MultiSelectSearchComboBoxExample.xaml.cs代码如下:

using System.Windows; using System.Windows.Controls; namespace WPFDevelopers.Samples.ExampleViews {     ///      /// MultiSelectComboBoxExample.xaml 的交互逻辑     ///      public partial class MultiSelectSearchComboBoxExample : UserControl     {         public MultiSelectSearchComboBoxExample()         {             InitializeComponent();         }         private void Button_Click(object sender, System.Windows.RoutedEventArgs e)         {             WPFDevelopers.Controls.MessageBox.Show($"{MyMultiSelectionSearchComboBox2.Text} \r\n总共选中:{MyMultiSelectionSearchComboBox2.SelectedItems.Count} 条","选中内容",MessageBoxButton.OK,MessageBoxImage.Information);               }     } }

效果图

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