using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Windows.Controls;

namespace PdmSwPlugin.UI
{
    /// <summary>
    /// SB.xaml 的交互逻辑
    /// </summary>
    public partial class SB : UserControl, INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected void RaisePropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        public SB()
        {
            InitializeComponent();
        }

        private string _selectedText = string.Empty;

        public string SelectedText
        {
            get
            {
                return _selectedText;
            }
            set
            {
                if (_selectedText != value)
                {
                    _selectedText = value;
                    RaisePropertyChanged("SelectedText");
                }
            }
        }

        private ObservableCollection<INotifyPropertyChanged> _dataSource;

        public ObservableCollection<INotifyPropertyChanged> DataSource
        {
            get
            {
                if (_dataSource == null)
                {
                    _dataSource = new ObservableCollection<INotifyPropertyChanged>();

                    _dataSource.CollectionChanged += (sender, e) =>
                    {
                        if (e.OldItems != null)
                        {
                            foreach (INotifyPropertyChanged bookEx in e.OldItems)
                            {
                                bookEx.PropertyChanged -= ItemPropertyChanged;
                            }
                        }

                        if (e.NewItems != null)
                        {
                            foreach (INotifyPropertyChanged bookEx in e.NewItems)
                            {
                                bookEx.PropertyChanged += ItemPropertyChanged;
                            }
                        }
                    };
                }

                return _dataSource;
            }
        }

        private void ItemPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            /*if (e.PropertyName == "IsChecked")
            {
                BookEx bookEx = sender as BookEx;

                if (bookEx != null)
                {
                    IEnumerable<BookEx> bookExs = BookExs.Where(b => b.IsChecked == true);

                    StringBuilder builder = new StringBuilder();

                    foreach (BookEx item in bookExs)
                    {
                        builder.Append(item.Book.Name + " ");
                    }

                    SelectedText = builder == null ? string.Empty : builder.ToString();
                }
            }*/
        }
    }
}