113 lines
3.7 KiB
C#
113 lines
3.7 KiB
C#
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using System.Diagnostics;
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// ReSharper disable once CheckNamespace
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namespace WPFluent.Controls;
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#pragma warning disable SA1601
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public partial class PasswordBox
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{
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private class PasswordHelper
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{
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private string _currentPassword;
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private string _currentText;
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private string _newPasswordValue;
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private readonly PasswordBox _passwordBox;
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public PasswordHelper(PasswordBox passwordBox)
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{
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_passwordBox = passwordBox;
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_currentText = string.Empty;
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_newPasswordValue = string.Empty;
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_currentPassword = string.Empty;
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}
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private bool IsDeleteOption()
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{
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Debug.Assert(_currentText == _passwordBox.Text, "_currentText == _passwordBox.Text");
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Debug.Assert(_currentPassword == _passwordBox.Password, "_currentPassword == _passwordBox.Password");
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return _currentText.Length < _currentPassword.Length;
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}
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private void UpdatePasswordWithInputCharacter(int insertIndex, string insertValue)
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{
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Debug.Assert(_currentText == _passwordBox.Text, "_currentText == _passwordBox.Text");
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if(_currentText.Length == _newPasswordValue.Length)
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{
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// If it's a direct character replacement, remove the existing one before inserting the new one.
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_newPasswordValue = _newPasswordValue.Remove(insertIndex, 1).Insert(insertIndex, insertValue);
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}
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else
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{
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_newPasswordValue = _newPasswordValue.Insert(insertIndex, insertValue);
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}
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}
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public string GetNewPassword()
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{
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_currentPassword = GetPassword();
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_newPasswordValue = _currentPassword;
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_currentText = _passwordBox.Text;
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var selectionIndex = _passwordBox.SelectionStart;
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var passwordChar = _passwordBox.PasswordChar;
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var newCharacters = _currentText.Replace(passwordChar.ToString(), string.Empty);
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bool isDeleted = false;
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if(IsDeleteOption())
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{
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_newPasswordValue = _currentPassword.Remove(
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selectionIndex,
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_currentPassword.Length - _currentText.Length);
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isDeleted = true;
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}
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switch(newCharacters.Length)
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{
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case > 1:
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{
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var index = _currentText.IndexOf(newCharacters[0]);
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_newPasswordValue =
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index > _newPasswordValue.Length - 1
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? $"{_newPasswordValue}{newCharacters}"
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: _newPasswordValue.Insert(index, newCharacters);
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break;
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}
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case 1:
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{
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for(int i = 0; i < _currentText.Length; i++)
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{
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if(_currentText[i] == passwordChar)
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{
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continue;
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}
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UpdatePasswordWithInputCharacter(i, _currentText[i].ToString());
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break;
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}
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break;
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}
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case 0 when !isDeleted:
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{
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// The input is a PasswordChar, which is to be inserted at the designated position.
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int insertIndex = selectionIndex - 1;
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UpdatePasswordWithInputCharacter(insertIndex, passwordChar.ToString());
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break;
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}
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}
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return _newPasswordValue;
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}
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public string GetPassword() => _passwordBox.Password ?? string.Empty;
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}
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}
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