public virtual void KeyDown(VimKeyEventArgs args)
{
bool handled = true;
if (_keyInputEvaluation == null) {
_keyInputEvaluation = new VimKeyInputEvaluation(this.Host);
}
IVimAction action = null;
string status_char = "";
VimKeyInputEvaluation.KeyEvalState eval_state = _keyInputEvaluation.Evaluate(args.KeyInput, out action, out status_char);
if (eval_state == VimKeyInputEvaluation.KeyEvalState.InProcess) {
Debug.Assert(status_char != null);
if (status_char == VimKeyInputEvaluation.Status_Char_Backspace) {
if (_statusText.Length > 0) {
_statusText = _statusText.Substring(0, _statusText.Length - 1);
}
else {
Debug.Assert(false);
}
}
else {
_statusText += status_char;
}
this.Host.UpdateStatus(_statusText);
}
else if (eval_state == VimKeyInputEvaluation.KeyEvalState.Success) {
if (action != null) {
// TODO live with some actions unimplemented
if (action is IVimMotion) {
(action as IVimMotion).Move(this.Host);
}
else if (action is IVimEdititon) {
this.DoEdition(action as IVimEdititon);
}
else {
Debug.Assert(false);
}
}
this.ResetKeyValuationStatus();
}
else if (eval_state == VimKeyInputEvaluation.KeyEvalState.Escape) {
this.ResetKeyValuationStatus();
}
else if (eval_state == VimKeyInputEvaluation.KeyEvalState.Error) {
if (this.IsSpecialKeyInput(args.KeyInput.Value)) {
handled = false;
}
this.ResetKeyValuationStatus();
}
else {
Debug.Assert(false);
this.ResetKeyValuationStatus();
}
args.Handled = handled;
}
/// <summary>
/// mayby too dedicated to VS's editor
/// </summary>
/// <param name="args"></param>
public virtual void KeyDown(VimKeyEventArgs args)
{
// important for dealing some unexpected scene
bool is_unsupported_key_last_input = false;
if (_activeNoneCharKeyInput != NoneCharKeyInputType.None) {
if (_activeNoneCharKeyInput == NoneCharKeyInputType.Unsupport) {
is_unsupported_key_last_input = true;
}
else {
// extends edition region regarding to last supported special key input
if (this.Host.CurrentPosition.CompareTo(_insertArea.End) > 0) {
// Key.Enter or Key.Tab
_insertArea = _insertArea.ExtendEndTo(this.Host.CurrentPosition);
}
else {
// Key.Backspace
if (this.Host.CurrentPosition.CompareTo(_insertArea.Start) > 0) {
// still in original insert area
_insertArea = _insertArea.ExtendEndTo(this.Host.CurrentPosition);
}
}
}
_activeNoneCharKeyInput = NoneCharKeyInputType.None;
}
if (args.KeyInput.Value.Length == 1) {
// KeyDown event is fired up before text's change, so the real position after input should be one char right by current.
VimPoint previous_pos = this.Host.CurrentPosition;
VimPoint next_pos = new VimPoint(previous_pos.X, previous_pos.Y + 1);
if (!is_unsupported_key_last_input) {
if (_insertArea.End.CompareTo(previous_pos) <= 0) {
// previous_pos may bigger than _insertArea.End in some cases
// in normally char input typing, simply extends insert area's end to current position
_insertArea = _insertArea.ExtendEndTo(next_pos);
}
else {
// Key.Backspace can invalidate current insert area, so need to renew it
_insertArea = new VimSpan(previous_pos, next_pos);
}
}
else {
_insertArea = new VimSpan(previous_pos, next_pos);
}
}
else if (args.KeyInput.Value == VimKeyInput.Escape) {
if (!is_unsupported_key_last_input) {
// Escape after normal key/char input, do some extra checks
if (this.Host.CurrentPosition.CompareTo(_insertArea.End) != 0) {
// you can't expect to get precise input text here, because everything is under control, but something wrong happened
// so we reset the insert area
_insertArea = new VimSpan(this.Host.CurrentPosition, this.Host.CurrentPosition);
}
}
this.CausedEdition.Text = this.Host.GetText(_insertArea);
this.Host.CurrentMode = PreviousMode;
this.Host.DismissDisplayWindows();
// keep consistency with Vim
new MotionCaretLeft(this.Host, 1).Move(this.Host);
args.Handled = true;
}
else {
_activeNoneCharKeyInput = NoneCharKeyInputType.None;
if (this.Host.CurrentPosition.CompareTo(_insertArea.End) == 0) {
// speical key input happens at the end of text input area,
// we think it's a valid input, save it as a active special key input,
// and in the next loop, to deal with it
if (args.KeyInput.Value == VimKeyInput.Enter) {
_activeNoneCharKeyInput = NoneCharKeyInputType.Enter;
}
else if (args.KeyInput.Value == VimKeyInput.Tab) {
_activeNoneCharKeyInput = NoneCharKeyInputType.Tab;
}
else if (args.KeyInput.Value == VimKeyInput.Backspace) {
_activeNoneCharKeyInput = NoneCharKeyInputType.Backspace;
}
else {
_activeNoneCharKeyInput = NoneCharKeyInputType.Unsupport;
}
}
}
}
