using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Text;
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 WpfApplication1
{
    /// <summary>
    /// Interaction logic for autoBox.xaml
    /// </summary>
    public partial class autoBox : UserControl
    {
        #region Members
        private ObservableCollection<AutoCompleteEntry> autoCompletionList;//数据源
        public ObservableCollection<AutoCompleteEntry> AutoCompletionList
        {
            get { return autoCompletionList; }
            set
            {
                autoCompletionList = value;
            }
        }

        private ObservableCollection<AutoCompleteEntry> selectList;//筛选后的数据
        public ObservableCollection<AutoCompleteEntry> SelectList
        {
            get { return selectList; }
            set
            {
                selectList = value;
            }
        }
        private delegate void TextChangedCallback();
        private bool insertText;//是否插入textbox
        private int searchThreshold;//文本框最少输入多少字符开始匹配
        public int Threshold
        {
            get { return searchThreshold; }
            set { searchThreshold = value; }
        }
        private bool autoBoxIsEnable = true;//是否可用
        public bool AutoBoxIsEnable
        {
            get { return autoBoxIsEnable; }
            set { autoBoxIsEnable = value; }
        }
        public object SelectListItem //当前选择项
        {
            get { return lb.SelectedItem; }
            set { lb.SelectedItem = value; }
        }
        private bool isAddButtonInTheFirst = false;//是否第一行添加按钮
        public bool IsAddButtonInTheFirst
        {
            get { return isAddButtonInTheFirst; }
            set { isAddButtonInTheFirst = value; }
        }
        private double boxWidth;
        public double BoxWidth
        {
            get { return tb.Width; }
            set
            {
                tb.Width = value;
                lb.Width = value;
            }
        }

        private double boxHeight;
        public double BoxHeight
        {
            get { return tb.Height; }
            set
            {
                tb.Height = value;
            }
        }
        private double boxMaxHeight;
        public double BoxMaxHeight
        {
            get { return lb.MaxHeight; }
            set { lb.MaxHeight = value; }
        }
        private string imgSource;
        public string ImgSource
        {
            get { return imgSource; }
            set { imgSource = value; }
        }
        #endregion

        #region Constructor
        public autoBox()
        {
            InitializeComponent();
        }
        public void Init(List<AutoCompleteEntry> list, bool isAddButton)//初始化
        {
            autoCompletionList = new ObservableCollection<AutoCompleteEntry>(list);
            searchThreshold = 1;
            lb.IsEnabled = AutoBoxIsEnable;
            lb.IsSynchronizedWithCurrentItem = true;
            lb.IsTabStop = false;
            lb.Visibility = Visibility.Collapsed;
            tb.TextChanged += new TextChangedEventHandler(textBox_TextChanged);
            tb.VerticalContentAlignment = VerticalAlignment.Center;
            tb.KeyUp += new KeyEventHandler(textBox_keyDown);
            tb.IsEnabled = AutoBoxIsEnable;
            IsAddButtonInTheFirst = isAddButton;
        }
        #endregion

        #region Methods
        private void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
          
        }
        private void textBox_keyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Down)
            {
                if (lb.HasItems && lb.SelectedIndex < lb.Items.Count)
                {
                    lb.SelectedIndex = lb.SelectedIndex + 1;
                    lb.ScrollIntoView(lb.SelectedItem);
                }
            }
            if (e.Key == Key.Up && lb.SelectedIndex > 0)
            {
                if (lb.HasItems)
                {
                    lb.SelectedIndex = lb.SelectedIndex - 1;
                    lb.ScrollIntoView(lb.SelectedItem);
                }
            }
            if (e.Key == Key.Enter && lb.SelectedItem != null)
            {
           
                if (IsAddButtonInTheFirst && lb.SelectedIndex < 1)
                {
                    return;
                }
                tb.Text = (SelectListItem as ListBoxItem).Content.ToString();
                tb.Focus();
                if (tb.Text.Trim().Length > 0)
                {
                    tb.Select(tb.Text.Trim().Length, 0);
                }
                if (lb.HasItems)
                {
                    lb.Items.Clear();
                }
            }
        }
        private void TextChanged()
        {
            #region 
            lb.ItemsSource = null;
            lb.SelectionChanged -= new SelectionChangedEventHandler(listBox_SelectionChanged);
            if (selectList != null)
            {
                selectList.Clear();
            }
            if (tb.Text.Length >= searchThreshold)
            {
                SelectList = new ObservableCollection<AutoCompleteEntry>(autoCompletionList.Where(p => p.Text.Contains(tb.Text.Trim())));
                if (SelectList.Count > 0)
                {
                    if (!IsAddButtonInTheFirst)
                    {
                        lb.ItemsSource = selectList;
                        // lb.DisplayMemberPath = "Text";
                        lb.Visibility = Visibility.Visible;
                    }
                    else
                    {
                        AutoCompleteEntry temp = new AutoCompleteEntry();
                        temp.BtnVisibility = Visibility.Visible;
                        temp.ImgVisibility = Visibility.Visible;
                        temp.ButtonContent = "添加";
                        selectList.Insert(0, temp);
                        lb.ItemsSource = selectList;
                        // lb.DisplayMemberPath = "Text";
                        lb.Visibility = Visibility.Visible;
                    }
                }
                else lb.Visibility = Visibility.Collapsed;
            }
            else
            {
                lb.Visibility = Visibility.Collapsed;
            }
            lb.SelectionChanged += new SelectionChangedEventHandler(listBox_SelectionChanged);
            #endregion
          
        }
        private void textBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (insertText == true) insertText = false;
            else
            {
                TextChanged();
            }
        }
        #endregion

        private void tb_LostFocus(object sender, RoutedEventArgs e)
        {
            if (!lb.IsFocused)
            {
                lb.Visibility = Visibility.Collapsed;
            }
        }
      
        private void Button_Click(object sender, RoutedEventArgs e)
        {

        }
    }
}