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Wpf.Ui.Extend/Controls/CheckComboBox/CheckComboBox.xaml.cs
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276
Wpf.Ui.Extend/Controls/CheckComboBox/CheckComboBox.xaml.cs
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using System;
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using System.Collections.ObjectModel;
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using System.ComponentModel;
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using System.Linq;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Controls.Primitives;
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using System.Windows.Data;
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using Wpf.Ui.Extend.Extensions;
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namespace Wpf.Ui.Extend.Controls
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{
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/// <summary>
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/// 通过该类，对绑定的集合->重新创建为CheckComboBoxItem->应用默认样式
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/// </summary>
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public class CheckComboBox : ComboBoxEx
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{
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#region PrivateProperty
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private ContentPresenter PART_ContentSite;
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private TextBox PART_FilterTextBox;
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private ICollectionView view;
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private Popup PART_Popup;
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private bool popupIsFirstOpen;
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#endregion
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#region DependencyProperty
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public static readonly DependencyProperty ContentProperty =
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DependencyProperty.Register(nameof(Content), typeof(string), typeof(CheckComboBox), new PropertyMetadata(string.Empty));
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/// <summary>
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/// 内容
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/// </summary>
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public string Content
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{
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get { return (string)GetValue(ContentProperty); }
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set { SetValue(ContentProperty, value); }
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}
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public static readonly DependencyProperty ValueProperty =
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DependencyProperty.Register(nameof(Value), typeof(string), typeof(CheckComboBox), new PropertyMetadata(string.Empty));
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/// <summary>
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/// 值
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/// </summary>
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public string Value
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{
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get { return (string)GetValue(ValueProperty); }
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set { SetValue(ValueProperty, value); }
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}
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#region SelectedObjList
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[Bindable(true), Description("获取或者设置当前勾选项列表")]
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public ObservableCollection<object> SelectedObjList
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{
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get { return (ObservableCollection<object>)GetValue(SelectedObjListProperty); }
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set { SetValue(SelectedObjListProperty, value); }
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}
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public static readonly DependencyProperty SelectedObjListProperty =
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DependencyProperty.Register(nameof(SelectedObjList), typeof(ObservableCollection<object>), typeof(CheckComboBox), new PropertyMetadata(null, OnSelectedObjListChanged));
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private static void OnSelectedObjListChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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var checkComboBox = d as CheckComboBox;
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if (checkComboBox.ItemsSource != null)
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checkComboBox.SetCheckComboBoxValueAndContent();
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}
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#endregion
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#region SelectedStrList
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public ObservableCollection<string> SelectedStrList
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{
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get { return (ObservableCollection<string>)GetValue(SelectedStrListProperty); }
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set { SetValue(SelectedStrListProperty, value); }
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}
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public static readonly DependencyProperty SelectedStrListProperty =
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DependencyProperty.Register(nameof(SelectedStrList), typeof(ObservableCollection<string>), typeof(CheckComboBox));
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#endregion
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/// <summary>
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/// 获取或者设置最多显示的选中个数
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/// </summary>
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public int MaxShowNumber
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{
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get { return (int)GetValue(MaxShowNumberProperty); }
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set { SetValue(MaxShowNumberProperty, value); }
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}
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public static readonly DependencyProperty MaxShowNumberProperty =
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DependencyProperty.Register(nameof(MaxShowNumber), typeof(int), typeof(CheckComboBox), new PropertyMetadata(3));
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#endregion
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#region Constructors
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static CheckComboBox()
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{
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DefaultStyleKeyProperty.OverrideMetadata(typeof(CheckComboBox), new FrameworkPropertyMetadata(typeof(CheckComboBox)));
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}
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public CheckComboBox()
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{
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this.SelectedObjList = [];
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this.SelectedStrList = [];
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}
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#endregion
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#region Override
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public override void OnApplyTemplate()
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{
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base.OnApplyTemplate();
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if (this.PART_FilterTextBox != null)
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{
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this.PART_FilterTextBox.TextChanged -= PART_FilterTextBox_TextChanged;
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}
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if (PART_Popup != null)
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{
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this.PART_Popup.Opened -= PART_Popup_Opened;
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}
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this.PART_ContentSite = this.GetTemplateChild("PART_ContentSite") as ContentPresenter;
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this.PART_FilterTextBox = this.GetTemplateChild("PART_FilterTextBox") as TextBox;
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this.PART_Popup = this.GetTemplateChild("PART_Popup") as Popup;
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if (this.PART_FilterTextBox != null)
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{
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this.PART_FilterTextBox.TextChanged += PART_FilterTextBox_TextChanged;
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}
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view = CollectionViewSource.GetDefaultView(this.ItemsSource);
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if (PART_Popup != null)
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{
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this.PART_Popup.Opened += PART_Popup_Opened;
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}
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this.Init();
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}
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protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
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{
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if (item is not CheckComboBoxItem)
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{
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if (element is CheckComboBoxItem checkComboBoxItem && !string.IsNullOrEmpty(this.DisplayMemberPath))
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{
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var binding = new Binding(this.DisplayMemberPath);
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checkComboBoxItem.SetBinding(CheckComboBoxItem.ContentProperty, binding);
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}
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}
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base.PrepareContainerForItemOverride(element, item);
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}
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protected override DependencyObject GetContainerForItemOverride()
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{
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return new CheckComboBoxItem();
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}
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protected override bool IsItemItsOwnContainerOverride(object item)
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{
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return (item is CheckComboBoxItem);
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}
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#endregion
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#region PrivateFunction
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private void Init()
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{
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this.popupIsFirstOpen = true;
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if (this.SelectedObjList != null)
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{
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foreach (var obj in this.SelectedObjList)
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{
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if (string.IsNullOrWhiteSpace(this.DisplayMemberPath))
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{
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this.SelectedStrList.Add(obj.ToString());
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}
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else
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{
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this.SelectedStrList.Add(obj.GetPropertyValue(this.DisplayMemberPath).ToString());
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}
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}
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}
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this.SetCheckComboBoxValueAndContent();
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}
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private void SetCheckComboBoxValueAndContent()
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{
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if (SelectedObjList == null || SelectedObjList.Count <= 0)
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SelectedStrList = [];
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if (this.SelectedStrList == null) return;
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this.Content = this.SelectedStrList.Count > this.MaxShowNumber
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? $"选中{this.SelectedStrList.Count}个"
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: this.SelectedStrList.Aggregate("", (current, p) => current + (p + ", ")).TrimEnd(new char[] { ' ' }).TrimEnd(new char[] { ',' });
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this.Value = this.SelectedStrList.Aggregate("", (current, p) => current + (p + ",")).TrimEnd(new char[] { ',' });
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}
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#endregion
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#region Internal
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/// <summary>
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/// 行选中
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/// </summary>
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/// <param name="item"></param>
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internal void NotifyCheckComboBoxItemClicked(CheckComboBoxItem item)
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{
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var itemContent = Convert.ToString(item.Content);
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this.SelectedStrList ??= [];
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this.SelectedObjList ??= [];
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if (item.IsSelected)
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{
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if (!this.SelectedStrList.Contains(item.Content))
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{
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this.SelectedStrList.Add(itemContent);
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}
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if (!this.SelectedObjList.Contains(item.DataContext))
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{
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this.SelectedObjList.Add(item.DataContext);
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}
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}
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else
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{
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if (this.SelectedStrList.Contains(itemContent))
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{
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this.SelectedStrList.Remove(itemContent);
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}
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if (this.SelectedObjList.Contains(item.DataContext))
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{
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this.SelectedObjList.Remove(item.DataContext);
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}
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}
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this.SetCheckComboBoxValueAndContent();
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}
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#endregion
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#region Event Implement Function
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/// <summary>
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/// 每次Open回显数据不太好，先这么处理
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/// </summary>
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private void PART_Popup_Opened(object sender, EventArgs e)
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{
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if (!this.popupIsFirstOpen) return;
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this.popupIsFirstOpen = false;
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if (this.ItemsSource == null || this.SelectedObjList == null) return;
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foreach (var obj in this.SelectedObjList)
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{
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if (this.ItemContainerGenerator.ContainerFromItem(obj) is CheckComboBoxItem checkComboBoxItem)
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checkComboBoxItem.IsSelected = true;
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}
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}
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/// <summary>
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/// 搜索关键字
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/// </summary>
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private void PART_FilterTextBox_TextChanged(object sender, TextChangedEventArgs e)
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{
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if (this.PART_FilterTextBox == null || view == null) return;
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view.Filter += (o) =>
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{
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var value = Convert.ToString(o.GetPropertyValue(this.DisplayMemberPath)).ToLower();
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return value.Contains(this.PART_FilterTextBox.Text);
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};
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foreach (var obj in this.SelectedObjList)
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{
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if (this.ItemContainerGenerator.ContainerFromItem(obj) is CheckComboBoxItem checkComboBoxItem)
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checkComboBoxItem.IsSelected = true;
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}
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}
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#endregion
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}
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}
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