136 lines
4.5 KiB
Plaintext
136 lines
4.5 KiB
Plaintext
using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using VirtualKeyboard.Wpf.Types;
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namespace VirtualKeyboard.Wpf.ViewModels
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{
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class VirtualKeyboardViewModel : INotifyPropertyChanged
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{
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private string _keyboardText;
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public string KeyboardText {
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get => _keyboardText;
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set
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{
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_keyboardText = value;
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NotifyPropertyChanged(nameof(KeyboardText));
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}
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}
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private KeyboardType _keyboardType;
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public KeyboardType KeyboardType {
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get => _keyboardType;
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private set
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{
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_keyboardType = value;
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NotifyPropertyChanged(nameof(KeyboardType));
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}
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}
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private bool _uppercase;
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public bool Uppercase
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{
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get => _uppercase;
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private set
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{
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_uppercase = value;
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NotifyPropertyChanged(nameof(Uppercase));
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}
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}
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private int _caretPosition;
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public int CaretPosition
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{
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get => _caretPosition;
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set
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{
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if (value < 0) _caretPosition = 0;
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else if (value > KeyboardText.Length) _caretPosition = KeyboardText.Length;
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else _caretPosition = value;
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NotifyPropertyChanged(nameof(CaretPosition));
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}
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}
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private string _selectedValue;
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public string SelectedValue
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{
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get => _selectedValue;
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set
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{
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_selectedValue = value;
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NotifyPropertyChanged(nameof(SelectedValue));
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}
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}
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public Command AddCharacter { get; }
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public Command ChangeCasing { get; }
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public Command RemoveCharacter { get; }
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public Command ChangeKeyboardType { get; }
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public Command Accept { get; }
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public VirtualKeyboardViewModel(string initialValue)
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{
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_keyboardText = initialValue;
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_keyboardType = KeyboardType.Alphabet;
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_uppercase = false;
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CaretPosition = _keyboardText.Length;
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AddCharacter = new Command(a =>
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{
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if (a is string character)
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if (character.Length == 1)
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{
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if (Uppercase) character = character.ToUpper();
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if (!string.IsNullOrEmpty(SelectedValue))
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{
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RemoveSubstring(SelectedValue);
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KeyboardText = KeyboardText.Insert(CaretPosition, character);
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CaretPosition++;
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SelectedValue = "";
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}
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else
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{
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KeyboardText = KeyboardText.Insert(CaretPosition, character);
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CaretPosition++;
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}
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}
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});
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ChangeCasing = new Command(a => Uppercase = !Uppercase);
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RemoveCharacter = new Command(a =>
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{
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if(!string.IsNullOrEmpty(SelectedValue))
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{
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RemoveSubstring(SelectedValue);
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}
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else
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{
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var position = CaretPosition - 1;
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if (position >= 0)
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{
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KeyboardText = KeyboardText.Remove(position, 1);
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if (position < KeyboardText.Length) CaretPosition--;
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else CaretPosition = KeyboardText.Length;
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}
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}
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});
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ChangeKeyboardType = new Command(a =>
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{
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if (KeyboardType == KeyboardType.Alphabet) KeyboardType = KeyboardType.Special;
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else KeyboardType = KeyboardType.Alphabet;
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});
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Accept = new Command(a => VKeyboard.Close());
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}
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private void RemoveSubstring(string substring)
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{
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var position = KeyboardText.IndexOf(substring);
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KeyboardText = KeyboardText.Remove(position, substring.Length);
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}
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public event PropertyChangedEventHandler PropertyChanged;
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private void NotifyPropertyChanged(string prop)
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{
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(prop));
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}
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}
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}
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