■ Behavior<T> 클래스를 사용해 리스트 박스 선택 동작을 만드는 방법을 보여준다.
▶ LinqExtension.cs
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using System.Collections.Generic; using System.Collections.ObjectModel; namespace TestProject { /// <summary> /// LINQ 확장 /// </summary> public static class LinqExtensions { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 관측 가능 컬렉션 구하기 - ToObservableCollection<TItem>(sourceEnumerable) /// <summary> /// 관측 가능 컬렉션 구하기 /// </summary> /// <typeparam name="TItem">항목 타입</typeparam> /// <param name="sourceEnumerable">소스 열거 가능 목록</param> /// <returns>관착 가능 컬렉션</returns> public static ObservableCollection<TItem> ToObservableCollection<TItem>(this IEnumerable<TItem> sourceEnumerable) { ObservableCollection<TItem> collection = new ObservableCollection<TItem>(); foreach(TItem item in sourceEnumerable) { collection.Add(item); } return collection; } #endregion } } |
▶ ListBoxSelectionBehavior.cs
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using System.Collections; using System.Collections.Specialized; using System.Linq; using System.Windows; using System.Windows.Controls; using System.Windows.Interactivity; namespace TestProject { /// <summary> /// 리스트 박스 선택 동작 /// </summary> public class ListBoxSelectionBehavior : Behavior<ListBox> { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 선택 항목 리스트 속성 - SelectedItemsProperty /// <summary> /// 선택 항목 리스트 속성 /// </summary> public static readonly DependencyProperty SelectedItemsProperty = DependencyProperty.Register ( nameof(SelectedItems), typeof(IList), typeof(ListBoxSelectionBehavior), new FrameworkPropertyMetadata ( null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, SelectedItemsPropertyChangedCallback ) ); #endregion #region 선택 값 리스트 속성 - SelectedValuesProperty /// <summary> /// 선택 값 리스트 속성 /// </summary> public static readonly DependencyProperty SelectedValuesProperty = DependencyProperty.Register ( nameof(SelectedValues), typeof(IList), typeof(ListBoxSelectionBehavior), new FrameworkPropertyMetadata ( null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, SelectedValuesPropertyChangedCallback ) ); #endregion ////////////////////////////////////////////////////////////////////////////////////////// Instance //////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 뷰 처리 여부 /// </summary> private bool viewHandled; /// <summary> /// 모델 처리 여부 /// </summary> private bool modelHandled; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 선택 항목 리스트 - SelectedItems /// <summary> /// 선택 항목 리스트 /// </summary> public IList SelectedItems { get => (IList)GetValue(SelectedItemsProperty); set => SetValue(SelectedItemsProperty, value); } #endregion #region 선택 값 리스트 - SelectedValues /// <summary> /// 선택 값 리스트 /// </summary> public IList SelectedValues { get => (IList)GetValue(SelectedValuesProperty); set => SetValue(SelectedValuesProperty, value); } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 선택 항목 리스트 속성 변경시 콜백 처리하기 - SelectedItemsPropertyChangedCallback(d, e) /// <summary> /// 선택 항목 리스트 속성 변경시 콜백 처리하기 /// </summary> /// <param name="d">의존 객체</param> /// <param name="e">이벤트 인자</param> private static void SelectedItemsPropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e) { ListBoxSelectionBehavior behavior = d as ListBoxSelectionBehavior; if(behavior.modelHandled) { return; } if(behavior.AssociatedObject == null) { return; } behavior.modelHandled = true; behavior.UpdateSelectedValues(); behavior.SelectItems(); behavior.modelHandled = false; } #endregion #region 선택 값 리스트 속성 변경시 콜백 처리하기 - SelectedValuesPropertyChangedCallback(d, e) /// <summary> /// 선택 값 리스트 속성 변경시 콜백 처리하기 /// </summary> /// <param name="d">의존 객체</param> /// <param name="e">이벤트 인자</param> private static void SelectedValuesPropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e) { ListBoxSelectionBehavior behavior = d as ListBoxSelectionBehavior; if(behavior.modelHandled) { return; } if(behavior.AssociatedObject == null) { return; } behavior.modelHandled = true; behavior.UpdateSelectedItems(); behavior.SelectItems(); behavior.modelHandled = false; } #endregion #region 속성 값 구하기 - GetPropertyValue(source, path) /// <summary> /// 속성 값 구하기 /// </summary> /// <param name="source">소스 객체</param> /// <param name="path">경로</param> /// <returns>속성 값</returns> private static object GetPropertyValue(object source, string path) { if(string.IsNullOrWhiteSpace(path)) { return source; } while(true) { if(path.Contains('.')) { string[] pathItemArray = path.Split('.'); string remainingProperty = path.Substring(path.IndexOf('.') + 1); source = source?.GetType().GetProperty(pathItemArray[0])?.GetValue(source, null); path = remainingProperty; continue; } return source?.GetType().GetProperty(path)?.GetValue(source, null); } } #endregion ////////////////////////////////////////////////////////////////////////////////////////// Instance //////////////////////////////////////////////////////////////////////////////// Protected ////////////////////////////////////////////////////////////////////// Function #region 접착시 처리하기 - OnAttached() /// <summary> /// 접착시 처리하기 /// </summary> protected override void OnAttached() { base.OnAttached(); AssociatedObject.SelectionChanged += ListBox_SelectionChanged; ((INotifyCollectionChanged)AssociatedObject.Items).CollectionChanged += ListBox_CollectionChanged; this.modelHandled = true; UpdateSelectedItems(); SelectItems(); this.modelHandled = false; } #endregion #region 탈착시 처리하기 - OnDetaching() /// <summary> /// 탈착시 처리하기 /// </summary> protected override void OnDetaching() { base.OnDetaching(); if(AssociatedObject != null) { AssociatedObject.SelectionChanged -= ListBox_SelectionChanged; ((INotifyCollectionChanged)AssociatedObject.Items).CollectionChanged -= ListBox_CollectionChanged; } } #endregion //////////////////////////////////////////////////////////////////////////////// Private ////////////////////////////////////////////////////////////////////// Event #region 리스트 박스 선택 변경시 처리하기 - ListBox_SelectionChanged(sender, e) /// <summary> /// 리스트 박스 선택 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void ListBox_SelectionChanged(object sender, SelectionChangedEventArgs e) { if(this.viewHandled) { return; } if(AssociatedObject.Items.SourceCollection == null) { return; } SelectedItems = AssociatedObject.SelectedItems.Cast<object>().ToObservableCollection(); } #endregion #region 리스트 박스 컬렉션 변경시 처리하기 - ListBox_CollectionChanged(sender, e) /// <summary> /// 리스트 박스 컬렉션 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void ListBox_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e) { if(this.viewHandled) { return; } if(AssociatedObject.Items.SourceCollection == null) { return; } SelectItems(); } #endregion ////////////////////////////////////////////////////////////////////// Function #region 항목 선택하기 - SelectItems() /// <summary> /// 항목 선택하기 /// </summary> /// <remarks>속성을 기준으로 리스트 박스에서 항목을 선택합니다</remarks> private void SelectItems() { this.viewHandled = true; AssociatedObject.SelectedItems.Clear(); if(SelectedItems != null) { foreach(object item in SelectedItems) { AssociatedObject.SelectedItems.Add(item); } } this.viewHandled = false; } #endregion #region 선택 항목 리스트 업데이트하기 - UpdateSelectedItems() /// <summary> /// 선택 항목 리스트 업데이트하기 /// </summary> /// <remarks>SelectedValues 속성값을 기반으로 SelectedItems 속성값을 업데이트 한다.</remarks> private void UpdateSelectedItems() { if(SelectedValues == null) { SelectedItems = null; } else { SelectedItems = AssociatedObject.Items.Cast<object>() .Where(i => SelectedValues.Contains(GetPropertyValue(i, AssociatedObject.SelectedValuePath))) .ToArray(); } } #endregion #region 선택 값 리스트 업데이트하기 - UpdateSelectedValues() /// <summary> /// 선택 값 리스트 업데이트하기 /// </summary> /// <remarks>SelectedItems 속성값을 기반으로 SelectedValues 속성값을 업데이트한다.</remarks> private void UpdateSelectedValues() { if(SelectedItems == null) { SelectedValues = null; } else { SelectedValues = SelectedItems.Cast<object>() .Select(i => GetPropertyValue(i, AssociatedObject.SelectedValuePath)) .ToArray(); } } #endregion } } |
▶ MainWindowViewModel.cs
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using System.Collections; using System.Collections.ObjectModel; using System.ComponentModel; namespace TestProject { /// <summary> /// 메인 윈도우 뷰 모델 /// </summary> public class MainWindowViewModel : INotifyPropertyChanged { //////////////////////////////////////////////////////////////////////////////////////////////////// Event ////////////////////////////////////////////////////////////////////////////////////////// Public #region 속성 변경시 이벤트 - PropertyChanged /// <summary> /// 속성 변경시 이벤트 /// </summary> public event PropertyChangedEventHandler PropertyChanged; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 제목 /// </summary> private string title = "Behavior<T> 클래스 : 리스트 박스 선택 동작 사용하기"; /// <summary> /// 성명 리스트 /// </summary> private IList nameList = null; /// <summary> /// 선택 성명 리스트 /// </summary> private IList selectedNameList = null; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 제목 - Title /// <summary> /// 제목 /// </summary> public string Title { get { return this.title; } set { this.title = value; FirePropertyChangedEvent(nameof(Title)); } } #endregion #region 성명 리스트 - NameList /// <summary> /// 성명 리스트 /// </summary> public IList NameList { get { return this.nameList; } set { this.nameList = value; FirePropertyChangedEvent(nameof(NameList)); } } #endregion #region 선택 성명 리스트 - SelectedNameList /// <summary> /// 선택 성명 리스트 /// </summary> public IList SelectedNameList { get { return this.selectedNameList; } set { this.selectedNameList = value; FirePropertyChangedEvent(nameof(SelectedNameList)); } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainWindowViewModel() /// <summary> /// 생성자 /// </summary> public MainWindowViewModel() { ObservableCollection<string> nameCollection = new ObservableCollection<string>(); nameCollection.Add("홍길동"); nameCollection.Add("김철수"); nameCollection.Add("이영희"); nameCollection.Add("김순희"); this.nameList = nameCollection; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Protected #region 속성 변경시 이벤트 발생시키기 - FirePropertyChangedEvent(propertyName) /// <summary> /// 속성 변경시 이벤트 발생시키기 /// </summary> /// <param name="propertyName">속성명</param> protected void FirePropertyChangedEvent(string propertyName) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); } #endregion } } |
▶ MainWindow.xaml
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<Window x:Class="TestProject.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" xmlns:local="clr-namespace:TestProject" Width="800" Height="600" Title="{Binding Title}" FontFamily="나눔고딕코딩" FontSize="16"> <Grid> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto" /> <RowDefinition Height="*" /> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="Auto" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="Auto" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> <TextBlock Grid.Row="1" Grid.Column="1" Margin="10" FontWeight="Bold" Text="소스 데이터" /> <ListBox Name="sourceListBox" Grid.Row="2" Grid.Column="1" Width="200" Height="300" SelectionMode="Extended" ItemsSource="{Binding NameList}"> <i:Interaction.Behaviors> <local:ListBoxSelectionBehavior SelectedItems="{Binding SelectedNameList}" /> </i:Interaction.Behaviors> </ListBox> <TextBlock Grid.Row="1" Grid.Column="3" Margin="10" FontWeight="Bold" Text="선택 데이터" /> <ListBox Name="selectedListBox" Grid.Row="2" Grid.Column="3" Width="200" Height="300" ItemsSource="{Binding SelectedNameList}" /> </Grid> </Window> |
▶ MainWindow.xaml.cs
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using System.Windows; namespace TestProject { /// <summary> /// 메인 윈도우 /// </summary> public partial class MainWindow : Window { //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainWindow() /// <summary> /// 생성자 /// </summary> public MainWindow() { InitializeComponent(); DataContext = new MainWindowViewModel(); } #endregion } } |
