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


namespace WpfControlLibrary.IpAddress
{
    /// <summary>
    /// IpAddressControl.xaml 的交互逻辑
    /// </summary>
    public partial class IpAddressControl : UserControl
    {
        public IpAddressControl()
        {
            InitializeComponent();
            DataObject.AddPastingHandler(part1, TextBox_Pasting);

        }


        private void TextBox_Pasting(object sender, DataObjectPastingEventArgs e)
        {
            var vm = this.DataContext as IpAddressViewModel;
            if ( e.DataObject.GetDataPresent(typeof(String)) )
            {
                String pastingText = (String)e.DataObject.GetData(typeof(String));
                vm.SetAddress(pastingText);
                part1.Focus();
                e.CancelCommand();
            }

        }

        private void Part4_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
        {
            if ( e.Key == Key.Back && part4.Text == "" )
            {
                part3.CaretIndex = part3.Text.Length;
                part3.Focus();
            }
            if ( e.Key == Key.Left && part4.CaretIndex == 0 )
            {
                part3.Focus();
                e.Handled = true;
            }

            if ( e.KeyboardDevice.Modifiers.HasFlag(ModifierKeys.Control) && e.Key == Key.C )
            {
                if ( part4.SelectionLength == 0 )
                {
                    var vm = this.DataContext as IpAddressViewModel;
                    Clipboard.SetText(vm.AddressText);
                }
            }
        }

        private void Part2_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
        {
            if ( e.Key == Key.Back && part2.Text == "" )
            {
                part1.CaretIndex = part1.Text.Length;
                part1.Focus();
            }
            if ( e.Key == Key.Right && part2.CaretIndex == part2.Text.Length )
            {
                part3.Focus();
                e.Handled = true;
            }
            if ( e.Key == Key.Left && part2.CaretIndex == 0 )
            {
                part1.Focus();
                e.Handled = true;
            }

            if ( e.KeyboardDevice.Modifiers.HasFlag(ModifierKeys.Control) && e.Key == Key.C )
            {
                if ( part2.SelectionLength == 0 )
                {
                    var vm = this.DataContext as IpAddressViewModel;
                    Clipboard.SetText(vm.AddressText);
                }
            }
        }

        private void Part3_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
        {
            if ( e.Key == Key.Back && part3.Text == "" )
            {
                part2.CaretIndex = part2.Text.Length;
                part2.Focus();
            }
            if ( e.Key == Key.Right && part3.CaretIndex == part3.Text.Length )
            {
                part4.Focus();
                e.Handled = true;
            }
            if ( e.Key == Key.Left && part3.CaretIndex == 0 )
            {
                part2.Focus();
                e.Handled = true;
            }

            if ( e.KeyboardDevice.Modifiers.HasFlag(ModifierKeys.Control) && e.Key == Key.C )
            {
                if ( part3.SelectionLength == 0 )
                {
                    var vm = this.DataContext as IpAddressViewModel;
                    Clipboard.SetText(vm.AddressText);
                }
            }
        }

        private void Part1_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if ( e.Key == Key.Right && part1.CaretIndex == part1.Text.Length )
            {
                part2.Focus();
                e.Handled = true;
            }
            if ( e.KeyboardDevice.Modifiers.HasFlag(ModifierKeys.Control) && e.Key == Key.C )
            {
                if ( part1.SelectionLength == 0 )
                {
                    var vm = this.DataContext as IpAddressViewModel;
                    Clipboard.SetText(vm.AddressText);
                }
            }
        }
    }
}