using Microsoft.Xaml.Behaviors;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Windows;
using System.Windows.Controls;

namespace FLY.UI.OSK
{
    /// <summary>
    /// 为textbox 添加 虚拟键盘 
    /// </summary>
    public class KeyboardBehavior : Behavior<UIElement>
    {
        /// <summary>
        /// 使能 点击 textbox 弹出虚拟键盘
        /// </summary>
        public static bool Enable = true;
        /// <summary>
        /// 使能 鼠标点击 textbox 弹出虚拟键盘, 只是为了测试！！！！
        /// </summary>
        public static bool EnableMouseDown = false;
        /// <summary>
        /// 虚拟键盘正在显示
        /// </summary>
        public static bool IsKeyboardOnShow = false;

        public KeyboardBehavior()
        {

        }
        /// <summary>
        /// 创建控件时调用
        /// </summary>
        protected override void OnAttached()
        {

            base.OnAttached();
            DependencyObject dobj = AssociatedObject;//它是Border
            do
            {
                if (dobj is System.Windows.Controls.TextBox)
                {
                    break;
                }
                dobj = System.Windows.Media.VisualTreeHelper.GetParent(dobj);
            } while (dobj != null);

            TextBox tb = dobj as TextBox;

            if (!tb.AcceptsReturn) //它不能通过按 Enter 键触发换行。 使按Enter 能实现LostFocus
            {
                tb.KeyDown += AssociatedObject_KeyDown;
            }
            //不能在 textbox 添加点击事件， 它根本不触发。。。
            //tb.TouchDown += AssociatedObject_TouchDown;
            //tb.MouseDown += AssociatedObject_MouseDown;


            AssociatedObject.TouchUp += AssociatedObject_TouchDown;
            AssociatedObject.MouseDown += AssociatedObject_MouseDown;
        }

        void AssociatedObject_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
        {
            if (e.Key == System.Windows.Input.Key.Enter)
            {
                TextBox tb = sender as TextBox;
                if (tb.AcceptsReturn)
                    return;
                //触发失去焦点事件！！！！！！！
                //让 绑定的 property 生效

                tb.RaiseEvent(new RoutedEventArgs(TextBox.LostFocusEvent));
            }
        }
        /// <summary>
        /// 销毁控件时调用
        /// </summary>
        protected override void OnDetaching()
        {
            DependencyObject dobj = AssociatedObject;
            do
            {
                if (dobj is System.Windows.Controls.TextBox)
                {
                    break;
                }
                dobj = System.Windows.Media.VisualTreeHelper.GetParent(dobj);
            } while (dobj != null);

            TextBox tb = dobj as TextBox;
            tb.KeyDown -= AssociatedObject_KeyDown;

            //border
            AssociatedObject.TouchDown -= AssociatedObject_TouchDown;
            AssociatedObject.MouseDown -= AssociatedObject_MouseDown;

            base.OnDetaching();
        }


        void AssociatedObject_TouchDown(object sender, System.Windows.Input.TouchEventArgs e)
        {
            if (IsKeyboardOnShow)//虚拟键盘已经打开
                return;

            //press release 都会调用
            if (!Enable)
                return;
            DependencyObject dobj = sender as DependencyObject;
            popPad(dobj);

            //不能在 press 时 handle = true。 这样会导致焦点没法落在 textbox 上，而且也没有了 release
            //e.Handled = true;

        }

        void AssociatedObject_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            if (IsKeyboardOnShow)//虚拟键盘已经打开
                return;

            //press release 都会调用
            if (e.ButtonState == System.Windows.Input.MouseButtonState.Released)
                return;

            if (!Enable)
                return;
            if (!EnableMouseDown)
                return;

            DependencyObject dobj = sender as DependencyObject;
            popPad(dobj);
            //不能在 press 时 handle = true。 这样会导致焦点没法落在 textbox 上，而且也没有了 release
            //e.Handled = true;
        }

        void popPad(DependencyObject dobj)
        {
            //向上查找，直到是System.Windows.Controls.TextBox
            do
            {
                if (dobj is System.Windows.Controls.TextBox)
                {
                    break;
                }
                dobj = System.Windows.Media.VisualTreeHelper.GetParent(dobj);
            } while (dobj != null);


            DependencyObject dobj_window = dobj;
            //一直向上找，直到找到window
            do
            {
                if (dobj_window is Window)
                {
                    break;
                }
                dobj_window = System.Windows.Media.VisualTreeHelper.GetParent(dobj_window);
            } while (dobj_window != null);


            if (dobj != null)
            {
                System.Windows.Controls.TextBox tb = dobj as System.Windows.Controls.TextBox;
                IVirtualKeyboard kb;
                if ((tb.Tag is string) && ((string)tb.Tag == "Full"))
                    kb = new Window_FullPad();
                else
                    kb = new Window_NumPad();

                Window w = (Window)kb;
                w.Owner = dobj_window as Window;
                IsKeyboardOnShow = true;
                w.Closed += (s, e) => { IsKeyboardOnShow = false; };

                kb.Open(tb);
            }
        }

    }

}