using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading;
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 FWindSoft.Wpf.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:WpfControl"
    ///
    ///
    /// 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:WpfControl;assembly=WpfControl"
    ///
    /// 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:TextBoxEditor/>
    ///
    /// </summary>
    public class TextBoxEditor : Control, IEditableObject
    {
        public static readonly DependencyProperty IsEditingProperty= DependencyProperty.Register("IsEditing", typeof(bool), typeof(TextBoxEditor), new PropertyMetadata(false, null));
        public static readonly DependencyProperty TextProperty = DependencyProperty.Register("Text", typeof(string), typeof(TextBoxEditor), new PropertyMetadata(null, null));
        public static readonly DependencyProperty CommandProperty = DependencyProperty.Register("Command", typeof(ICommand), typeof(TextBoxEditor), new FrameworkPropertyMetadata(null));     
        public static readonly DependencyProperty CommandParameterProperty = DependencyProperty.Register("CommandParameter", typeof(object), typeof(TextBoxEditor), new FrameworkPropertyMetadata(null));

        static TextBoxEditor()
        {//new PropertyChangedCallback(PropertyChangedCallback)
            DefaultStyleKeyProperty.OverrideMetadata(typeof(TextBoxEditor), new FrameworkPropertyMetadata(typeof(TextBoxEditor)));
        }

        public TextBoxEditor()
        {
            //this.IsReadOnly = true;
            this.GotFocus += TextBoxEditor_GotFocus;
            this.LostFocus += TextBoxEditor_LostFocus;
            m_GetFocus = false;
        }

        private bool m_GetFocus;
        private void TextBoxEditor_GotFocus(object sender, RoutedEventArgs e)
        {
            if (this.Equals(sender))
            {
                m_GetFocus = true;
            }
        }

        private void TextBoxEditor_LostFocus(object sender, RoutedEventArgs e)
        {
            if (this.Equals(sender))
            {
                var dis = this.Dispatcher; // System.Windows.Threading.Dispatcher.CurrentDispatcher;
                //这个多线程有点用了
                dis.BeginInvoke(System.Windows.Threading.DispatcherPriority.Input,
                    new Action(() =>
                    {
                        //Thread.Sleep(1000);
                        if (m_GetFocus)
                        {
                            m_GetFocus = false;
                        }
                        else
                        {
                            CancelEdit();
                            IsEditing = false;
                        }


                    }));
            }

        }

        protected override void OnLostFocus(RoutedEventArgs e)
        {
            //base.OnLostFocus(e);
            //CancelEdit();
            //IsEditing = false;
        }
        /// <summary>
        /// 关联textBox
        /// </summary>
        public TextBox TextBox { get; private set; }
        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
            var btnUpdate = this.Template.FindName("BtnUpdate",this) as Button;
            if (btnUpdate != null)
            {
                btnUpdate.Click += BtnUpdate_Click;
            }
            var btnClear = this.Template.FindName("BtnClear", this) as Button;
            if (btnClear != null)
            {
                btnClear.Click += BtnClear_Click; ;
            }
            var btnComplete = this.Template.FindName("BtnComplete", this) as Button;
            if (btnComplete != null)
            {
                btnComplete.Click += BtnComplete_Click; ;
            }
            var textBox = this.Template.FindName("PART_ContentHost", this) as TextBox;
            if (textBox != null)
            {
                TextBox = textBox;
            }
        }

        private void BtnComplete_Click(object sender, RoutedEventArgs e)
        {
            EndEdit();
            IsEditing = false;
        }

        private void BtnClear_Click(object sender, RoutedEventArgs e)
        {
            CancelEdit();
            IsEditing = false;
        }

        private void BtnUpdate_Click(object sender, RoutedEventArgs e)
        {
            if (!IsEditing)
            {
                IsEditing = !IsEditing;
                BeginEdit();
            }
          
        }



        #region IEditableObject 接口实现
        private string TempText { get; set; }
        public void BeginEdit()
        {
            TempText = this.Text;
            TextBox.Focus();
            if (this.Text != null)
            {

                TextBox.Select(this.Text.Count(), 0);
            }
            else
            {
                TextBox.Select(0, 0);
            }

        }

        public void EndEdit()
        {
            //只在开始编辑时设置
            //TempText = this.Text;
       }

        public void CancelEdit()
        {
            this.Text = TempText;
        } 
        #endregion

        public bool IsEditing
        {
            get { return (bool) this.GetValue(IsEditingProperty); }
            set { this.SetValue(IsEditingProperty, value); }
        }
        public string Text
        {
            get { return this.GetValue(TextProperty) as string; }
            set { this.SetValue(TextProperty, value); }
        }
        public ICommand Command
        {
            get
            {
                return (ICommand)base.GetValue(CommandProperty);
            }
            set
            {
                base.SetValue(CommandProperty, value);
            }
        }
        public object CommandParameter
        {
            get
            {
                return base.GetValue(CommandParameterProperty);
            }
            set
            {
                base.SetValue(CommandParameterProperty, value);
            }
        }
    }
}