using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
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 PDF_Master.CustomControl
{
    /// <summary>
    /// NumericUpDown.xaml 的交互逻辑
    /// </summary>
    public partial class NumericUpDown : UserControl
    {


        public string Text
        {
            get { return (string)GetValue(TextProperty); }
            set { SetValue(TextProperty, value); }
        }

        public static readonly DependencyProperty TextProperty =
            DependencyProperty.Register("Text", typeof(string), typeof(NumericUpDown), new PropertyMetadata("1"));


        /// <summary>
        /// 当前值
        /// </summary>
        public double Value
        {
            get { return (double)GetValue(ValueProperty); }
            set
            {
                SetValue(ValueProperty, value);
                if (value > Maximum)
                {
                    SetValue(ValueProperty, Maximum);
                }
                else if (value < Minimum)
                {
                    SetValue(ValueProperty, Minimum);
                }
                else
                {
                    SetValue(ValueProperty, value);
                    TextBox_Num.Text = Value.ToString();
                }
            }
        }

        public static readonly DependencyProperty ValueProperty =
            DependencyProperty.Register("Value", typeof(double), typeof(NumericUpDown), new PropertyMetadata(0.0, SelectedItemSourcePropertyChanged));

        private static void SelectedItemSourcePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = d as NumericUpDown;
            var value = (double)e.NewValue;
            if (control != null)
            {
                control.TextBox_Num.Text = Convert.ToString(value);

            }
        }
        /// <summary>
        /// 最大值
        /// </summary>
        public double Maximum
        {
            get { return (double)GetValue(MaximumProperty); }
            set { SetValue(MaximumProperty, value); }
        }

        public static readonly DependencyProperty MaximumProperty =
            DependencyProperty.Register("Maximum", typeof(double), typeof(NumericUpDown), new PropertyMetadata(9999.0));



        /// <summary>
        /// 最小值
        /// </summary>
        public double Minimum
        {
            get { return (double)GetValue(MinimumProperty); }
            set
            {
                SetValue(MinimumProperty, value);
            }
        }

        public static readonly DependencyProperty MinimumProperty =
            DependencyProperty.Register("Minimum", typeof(double), typeof(NumericUpDown), new PropertyMetadata(0.0));


        /// <summary>
        /// 增长步长
        /// </summary>

        public double TickFrequency
        {
            get { return (double)GetValue(TickFrequencyProperty); }
            set { SetValue(TickFrequencyProperty, value); }
        }

        public static readonly DependencyProperty TickFrequencyProperty =
            DependencyProperty.Register("TickFrequency", typeof(double), typeof(NumericUpDown), new PropertyMetadata(1.0));



        public Visibility ShowBtn
        {
            get { return (Visibility)GetValue(ShowBtnProperty); }
            set { SetValue(ShowBtnProperty, value); }
        }

        public static readonly DependencyProperty ShowBtnProperty =
            DependencyProperty.Register("ShowBtn", typeof(Visibility), typeof(NumericUpDown), new PropertyMetadata(Visibility.Visible));



        public NumericUpDown()
        {
            InitializeComponent();
        }

        private void Button_Add_Click(object sender, RoutedEventArgs e)
        {
            int num = 0;
            double targetvalue = 0;
            bool result = int.TryParse(this.TextBox_Num.Text.Trim(), out num);
            if (result)
            {
                targetvalue = num + TickFrequency;
            }
            else
            {
                targetvalue = Maximum;
            }
            if (targetvalue > Maximum)
            {
                targetvalue = Maximum;
            }
            this.TextBox_Num.Text = targetvalue.ToString();
            Text = this.TextBox_Num.Text;
            Value = targetvalue;
        }

        private void Button_Sub_Click(object sender, RoutedEventArgs e)
        {
            int num = 0;
            double targetvalue = 0;
            bool result = int.TryParse(this.TextBox_Num.Text.Trim(), out num);
            if (result)
            {
                targetvalue = num - TickFrequency;
            }
            else
            {
                targetvalue = Minimum;
            }

            if (targetvalue < Minimum)
            {
                targetvalue = Minimum;
            }
            this.TextBox_Num.Text = targetvalue.ToString();
            Text = this.TextBox_Num.Text;
            Value = targetvalue;
        }

        private void CountTextBox_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            e.Handled = new Regex("[^0-9]+").IsMatch(e.Text);
        }

        private void TextBox_Num_LostFocus(object sender, RoutedEventArgs e)
        {
            //校验输入的过程 放在失去焦点中，而不是放在放在文本变化事件中
            //如果放在文本变化事件中 会影响用户正常的输入，体验比较别扭
            CheckInput();
        }

        /// <summary>
        /// 校验输入是否合法
        /// </summary>
        private void CheckInput()
        {
            //控件未显示前不进行逻辑处理 避免初始化前卡顿
            if (!this.IsLoaded)
                return;
            //int.TryParse("30.0000610351563")，字符串有小数点，会转换失败
            double num = 0;
            if (/*this.TextBox_Num.Text == "" ||*/ !double.TryParse(this.TextBox_Num.Text, out num))
            {
                this.TextBox_Num.Text = Minimum.ToString();
            }
            if (double.Parse(this.TextBox_Num.Text) < Minimum)
            {
                this.TextBox_Num.Text = Minimum.ToString();
            }
            Text = this.TextBox_Num.Text;
            Value = (int)double.Parse(this.TextBox_Num.Text);
        }

        private void TextBox_Num_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Enter)
            {
                CheckInput();
            }
        }

        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            //修复控件初始化显示固定值的问题
            if (Value >= Minimum)
            {
                Text = Value.ToString();
            }
        }
    }
}