using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Globalization;
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using System.Linq;
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using System.Reflection;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Data;
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using System.Windows.Input;
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namespace HMI.UI
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{
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public class MultiComboBoxItem : ComboBoxItem, INotifyPropertyChanged
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{
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#region ...
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public event PropertyChangedEventHandler PropertyChanged;
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protected void RaisePropertyChanged(string propertyName)
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{
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if (PropertyChanged != null)
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{
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PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
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}
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}
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#endregion
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private MultiComboBox parent;
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public MultiComboBoxItem(MultiComboBox parent)
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{
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this.parent = parent;
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this.DataContextChanged += MultiComboBoxItem_DataContextChanged;
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}
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protected override void OnMouseMove(MouseEventArgs e)
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{
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this.PreviewMouseUp += MultiComboBoxItem_PreviewMouseUp;
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base.OnMouseMove(e);
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}
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protected override void OnMouseLeave(MouseEventArgs e)
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{
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this.PreviewMouseUp -= MultiComboBoxItem_PreviewMouseUp;
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base.OnMouseLeave(e);
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}
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protected override void OnLostFocus(RoutedEventArgs e)
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{
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this.PreviewMouseUp -= MultiComboBoxItem_PreviewMouseUp;
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base.OnLostFocus(e);
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}
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private void MultiComboBoxItem_PreviewMouseUp(object sender, MouseButtonEventArgs e)
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{
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if (e.OriginalSource is CheckBox)
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{
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// 从CheckBox点击传过来的事件要拉回焦点，不然会卡在Popup层当前的Item上
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this.Focus();
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}
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if (DataContext is MultiComboBoxData data)
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{
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data.IsChecked = !data.IsChecked;
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e.Handled = true;
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}
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}
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private void MultiComboBoxItem_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
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{
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if (e.OldValue != null && e.OldValue is MultiComboBoxData oldData)
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{
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oldData.IsCheckedChanged -= DataIsCheckedChangedChange;
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}
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if (DataContext != null && DataContext is MultiComboBoxData newData)
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{
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newData.IsCheckedChanged += DataIsCheckedChangedChange;
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}
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}
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private void DataIsCheckedChangedChange(object sender, bool isChecked)
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{
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parent.Item_IsCheckedChanged((MultiComboBoxData)sender, this, isChecked);
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}
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}
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public class MultiComboBoxDataConverter : IValueConverter
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{
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public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
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{
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if (value is IEnumerable<object> items)
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{
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return items.Select(item => new MultiComboBoxData(item, "DisplayName", "DataValue")).ToList();
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}
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return null;
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}
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public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
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{
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return value;
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}
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}
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public class MultiComboBoxData : INotifyPropertyChanged
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{
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#region ...
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public event PropertyChangedEventHandler PropertyChanged;
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protected void RaisePropertyChanged(string propertyName)
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{
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if (PropertyChanged != null)
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{
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PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
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}
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}
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#endregion
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public event EventHandler<bool> IsCheckedChanged;
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private bool isChecked;
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public bool IsChecked
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{
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get { return isChecked; }
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set
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{
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isChecked = value;
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RaisePropertyChanged("IsChecked");
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IsCheckedChanged?.Invoke(this, value);
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}
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}
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public string DisplayName
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{
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get => showName?.GetValue(Data).ToString();
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}
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public string DataValue
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{
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get => valueName?.GetValue(Data).ToString();
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}
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private PropertyInfo showName;
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private PropertyInfo valueName;
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public MultiComboBoxData(object data, string showName, string valueName)
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{
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this.Data = data;
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this.showName = data.GetType().GetProperty(showName);
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this.valueName = data.GetType().GetProperty(valueName);
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}
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public object Data { get; private set; }
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}
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/// <summary>
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/// MultiCombox.xaml 的交互逻辑
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/// </summary>
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public partial class MultiComboBox : ComboBox
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{
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public static readonly string[] splits = new string[] { ", " };
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protected override DependencyObject GetContainerForItemOverride()
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{
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var item = new MultiComboBoxItem(this);
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return item;
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}
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[Bindable(true)]
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[Category("Appearance")]
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[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
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[Localizability(LocalizationCategory.NeverLocalize)]
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public object SelectedValues
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{
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get
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{
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return GetValue(SelectedValuesProperty);
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}
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set
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{
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SetValue(SelectedValuesProperty, value);
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}
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}
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public static readonly DependencyProperty SelectedValuesProperty =
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DependencyProperty.RegisterAttached("SelectedValues", typeof(object), typeof(MultiComboBox),
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new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
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public void Item_IsCheckedChanged(MultiComboBoxData data, MultiComboBoxItem item, bool isChecked)
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{
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var selectedValues = SelectedValues?.ToString() ?? "";
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var showNames = this.Text?.ToString() ?? "";
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List<string> values = string.IsNullOrEmpty(selectedValues) ? new List<string>() :
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selectedValues.Split(splits, StringSplitOptions.RemoveEmptyEntries).ToList();
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List<string> names = string.IsNullOrEmpty(showNames) ? new List<string>() :
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showNames.Split(splits, StringSplitOptions.RemoveEmptyEntries).ToList();
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if (isChecked)
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{
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values.Add(data.DataValue);
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names.Add(data.DisplayName);
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}
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else
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{
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values.Remove(data.DataValue);
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names.Remove(data.DisplayName);
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}
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Text = string.Join(", ", names);
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SelectedValues = string.Join(", ", values);
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}
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}
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}
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