using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace XHandler.Controls
{
    /// <summary>
    /// 按照步骤 1a 或 1b 操作，然后执行步骤 2 以在 XAML 文件中使用此自定义控件。
    ///
    /// 步骤 1a) 在当前项目中存在的 XAML 文件中使用该自定义控件。
    /// 将此 XmlNamespace 特性添加到要使用该特性的标记文件的根
    /// 元素中:
    ///
    ///     xmlns:MyNamespace="clr-namespace:XHandler.Controls"
    ///
    ///
    /// 步骤 1b) 在其他项目中存在的 XAML 文件中使用该自定义控件。
    /// 将此 XmlNamespace 特性添加到要使用该特性的标记文件的根
    /// 元素中:
    ///
    ///     xmlns:MyNamespace="clr-namespace:XHandler.Controls;assembly=XHandler.Controls"
    ///
    /// 您还需要添加一个从 XAML 文件所在的项目到此项目的项目引用，
    /// 并重新生成以避免编译错误:
    ///
    ///     在解决方案资源管理器中右击目标项目，然后依次单击
    ///     “添加引用”->“项目”->[浏览查找并选择此项目]
    ///
    ///
    /// 步骤 2)
    /// 继续操作并在 XAML 文件中使用控件。
    ///
    ///     <MyNamespace:MultiComboBox/>
    ///
    /// </summary>
    public class MultiComboBox : ComboBox
    {
        static MultiComboBox()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(MultiComboBox), new FrameworkPropertyMetadata(typeof(MultiComboBox)));
        }


        private static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            d.SetValue(e.Property, e.NewValue);
        }


        private ObservableCollection<MultiCbxBaseData> _ChekedItems = new ObservableCollection<MultiCbxBaseData>();
        /// <summary>
        /// 选中项列表
        /// </summary>
        public ObservableCollection<MultiCbxBaseData> ChekedItems
        {
            get { return _ChekedItems; }
            set { SetValue(ChekedItemsProperty, value); }
        }

        public static readonly DependencyProperty ChekedItemsProperty =
            DependencyProperty.Register("ChekedItems", typeof(ObservableCollection<MultiCbxBaseData>), typeof(MultiComboBox), new PropertyMetadata(new ObservableCollection<MultiCbxBaseData>(), OnPropertyChanged));



        /// <summary>
        /// ListBox竖向列表
        /// </summary>
        private ListBox _ListBoxV;

        /// <summary>
        /// ListBox横向列表
        /// </summary>
        private ListBox _ListBoxH;

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
            _ListBoxV = Template.FindName("PART_ListBox", this) as ListBox;
            _ListBoxH = Template.FindName("PART_ListBoxChk", this) as ListBox;
            if (_ListBoxV != null && _ListBoxH != null)
            {
                _ListBoxH.ItemsSource = ChekedItems;
                _ListBoxV.SelectionChanged += _ListBoxV_SelectionChanged;
                _ListBoxH.SelectionChanged += _ListBoxH_SelectionChanged;

                if (ItemsSource != null)
                {
                    foreach (var item in ItemsSource)
                    {
                        MultiCbxBaseData bdc = item as MultiCbxBaseData;
                        if (bdc.IsCheck)
                        {
                            _ListBoxV.SelectedItems.Add(bdc);
                        }
                    }
                }
            }
        }

        private void _ListBoxH_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            foreach (var item in e.AddedItems)
            {
                MultiCbxBaseData datachk = item as MultiCbxBaseData;

            }
            foreach (var item in e.RemovedItems)
            {
                MultiCbxBaseData datachk = item as MultiCbxBaseData;

                for (int i = 0; i < _ListBoxV.SelectedItems.Count; i++)
                {
                    MultiCbxBaseData datachklist = _ListBoxV.SelectedItems[i] as MultiCbxBaseData;
                    if (datachklist.ID == datachk.ID)
                    {
                        _ListBoxV.SelectedItems.Remove(_ListBoxV.SelectedItems[i]);
                    }
                }
            }
        }

        void _ListBoxV_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            foreach (var item in e.AddedItems)
            {
                MultiCbxBaseData datachk = item as MultiCbxBaseData;
                datachk.IsCheck = true;
                if (_ChekedItems.IndexOf(datachk) < 0)
                {
                    _ChekedItems.Add(datachk);
                }
            }

            foreach (var item in e.RemovedItems)
            {
                MultiCbxBaseData datachk = item as MultiCbxBaseData;
                datachk.IsCheck = false;
                _ChekedItems.Remove(datachk);
            }
        }

        public void SetSelecteItems(ObservableCollection<MultiCbxBaseData> items)
        { 
            foreach(var item in items)
            {
                _ListBoxV.SelectedItems.Add(item);
            }
        }

        public void AddSelectedItem(MultiCbxBaseData item)
        {
            _ListBoxV.SelectedItems.Add(item);
        }

        public class MultiCbxBaseData
        {
            private string _id;
            /// <summary>
            /// 关联主键
            /// </summary>
            public string ID
            {
                get { return _id; }
                set { _id = value; }
            }

            private string _viewName;
            /// <summary>
            /// 显示名称
            /// </summary>
            public string ViewName
            {
                get { return _viewName; }
                set
                {
                    _viewName = value;
                }
            }

            private bool _isCheck;
            /// <summary>
            /// 是否选中
            /// </summary>
            public bool IsCheck
            {
                get { return _isCheck; }
                set { _isCheck = value; }
            }
        }
    }
}