idTech4.UI.idInputField.ProcessKeyDown C# (CSharp) Method

		public void ProcessKeyDown(KeyEventArgs e)
		{
			if((e.Alt == true) || (e.Control == true))
			{
				if((e.Control == true) && (e.KeyCode == Keys.A))
				{
					this.SelectionStart = 0;
					this.SelectionDirection = _buffer.Length;
				}
			}
			else if((e.KeyCode == Keys.Return) || (e.KeyCode == Keys.Enter))
			{
				if(_buffer.Length > 0)
				{
					if(InputAvailable != null)
					{
						InputAvailable(this, new EventArgs());
					}

					_historyLines.Add(_buffer.ToString());
					_historyLine = _historyLines.Count;

					_buffer.Clear();

					_selectionStart = 0;
					_selectionDirection = 0;
				}
			}
			else if(e.KeyCode == Keys.Tab)
			{
				AutoComplete();
				return;
			}
			else if((e.KeyCode == Keys.Home) || (e.KeyCode == Keys.End))
			{
				if(e.Shift == true)
				{
					// we're shift selecting while pressing home or end, figure out where to select from.
					int start = this.SelectionStart;
					this.SelectionStart = (e.KeyCode == Keys.Home) ? 0 : (this.SelectionDirection != 0) ? -this.SelectionDirection : start;

					if(e.KeyCode == Keys.End)
					{
						this.SelectionDirection = _buffer.Length - start;
					}
					else
					{
						this.SelectionDirection = -(start + 1);
					}
				}
				else
				{
					this.SelectionDirection = 0;
					this.SelectionStart = (e.KeyCode == Keys.Home) ? 0 : _buffer.Length;
				}
			}
			else if((e.KeyCode == Keys.Left) || (e.KeyCode == Keys.Right))
			{
				if(e.Shift == true)
				{
					this.SelectionDirection += (e.KeyCode == Keys.Left) ? -1 : 1;
				}
				else
				{
					if(this.SelectionDirection != 0)
					{
						if((this.SelectionDirection != 0) && (e.KeyCode == Keys.Right))
						{
							this.SelectionStart = this.SelectionStart + this.SelectionLength;
						}
						else
						{
							this.SelectionStart = this.SelectionStart;
						}

						this.SelectionDirection = 0;
					}
					else
					{
						this.SelectionStart += (e.KeyCode == Keys.Left) ? -1 : 1;
					}
				}
			}
			else if((e.KeyCode == Keys.Up) || (e.KeyCode == Keys.Down))
			{
				// command history
				_historyLine += (e.KeyCode == Keys.Up) ? -1 : 1;

				if(_historyLine < 0)
				{
					_historyLine = 0;
				}
				else if(_historyLine >= _historyLines.Count)
				{
					_historyLine = _historyLines.Count;
				}

				_buffer.Clear();

				if(_historyLine < _historyLines.Count)
				{
					_buffer.Append(_historyLines[_historyLine]);
				}

				this.SelectionStart = this.Length;
				this.SelectionDirection = 0;
			}
			else if((e.KeyCode == Keys.Back) || (e.KeyCode == Keys.Delete))
			{
				if((e.KeyCode == Keys.Delete) && (this.SelectionStart == _buffer.Length))
				{
					// don't want to delete past the end of the buffer.
					return;
				}
				else if((e.KeyCode == Keys.Back) && (this.SelectionStart == 0))
				{
					// don't want backspace deleting paste the start of the buffer.
					return;
				}
				else if(this.SelectionLength > 0)
				{
					_buffer.Remove(this.SelectionStart, this.SelectionLength);
					this.SelectionStart = this.SelectionStart;
				}
				else
				{
					int dir = (e.KeyCode == Keys.Back) ? -1 : 0;

					_buffer.Remove(this.SelectionStart + dir, 1);
					this.SelectionStart += dir;
				}

				if(this.SelectionStart > _buffer.Length)
				{
					this.SelectionStart = _buffer.Length;
				}

				this.SelectionDirection = 0;
			}
			else 
			{
				char c = idHelper.CharacterFromKeyCode(e.KeyCode, e.Modifiers);

				if(c != '\0')
				{
					_buffer.Insert(_selectionStart, c);

					this.SelectionStart++;
					this.SelectionDirection = 0;
				}
			}

			// pressing tab exits the method above, so if we got here
			// the user pressed another key and broke out of autocomplete.
			_autoComplete = null;
		}