/// <summary>
/// Handles text input event.
/// </summary>
/// <exception cref="InvalidOperationException">
/// This object is already disposed.
/// </exception>
/// <exception cref="ArgumentNullException">Parameter 'text' is null.</exception>
internal void HandleTextInput(string text)
{
if (_IsDisposed)
{
throw new InvalidOperationException("This object is already disposed.");
}
if (text == null)
{
throw new ArgumentNullException("text");
}
var doc = Document;
var input = new StringBuilder(Math.Max(64, text.Length));
IGraphics g = null;
// if in read only mode, just notify and return
if (doc.IsReadOnly)
{
Plat.Inst.MessageBeep();
return;
}
// ignore if input is an empty text
if (text.Length == 0)
{
return;
}
try
{
int newCaretIndex;
int selBegin, selEnd;
g = _UI.GetIGraphics();
// begin grouping UNDO action
doc.BeginUndo();
// clear rectangle selection
if (doc.RectSelectRanges != null)
{
doc.DeleteRectSelectText();
}
// handle input characters
foreach (char ch in text)
{
// try to use hook delegate
if (AutoIndentHook != null &&
AutoIndentHook(_UI, ch) == true)
{
// Do nothing if this was handled by the hook
continue;
}
// execute built-in hook logic
if (TextUtil.IsEolChar(ch))
{
// if an EOL code was found, stop consuming and discard
// following inputs
if (IsSingleLineMode)
{
break;
}
// change all EOL code in the text
input.Append(doc.EolCode);
}
else if (ch == '\t' && _UsesTabForIndent == false)
{
string spaces = GetTabEquivalentSpaces(_UI,
doc.CaretIndex);
if (spaces == "")
{
// When the caret position is close to next tab
// stop, an empty string will be the equivalent to
// a tab. In this case we should think as if the
// caret is just on the next tab stop.
for (int i = 0; i < View.TabWidth; i++)
{
spaces += ' ';
}
}
input.Append(spaces);
}
else if (ch == '\x3000' && ConvertsFullWidthSpaceToSpace)
{
input.Append('\x0020');
}
else
{
// remember this character
input.Append(ch);
}
}
// calculate new caret position
doc.GetSelection(out selBegin, out selEnd);
newCaretIndex = selBegin + input.Length;
// calc replacement target range
if (IsOverwriteMode &&
selBegin == selEnd && selEnd + 1 < doc.Length &&
TextUtil.IsEolChar(doc[selBegin]) != true)
{
selEnd++;
}
// replace selection to input char
doc.Replace(input.ToString(), selBegin, selEnd);
doc.SetSelection(newCaretIndex, newCaretIndex);
// set desired column
if (UsesStickyCaret == false)
{
_View.SetDesiredColumn(g);
}
// update graphic
_View.ScrollToCaret(g);
//NO_NEED//_View.Invalidate( xxx ); // Doc_ContentChanged will do invalidation well.
}
finally
{
doc.EndUndo();
input.Length = 0;
if (g != null)
{
g.Dispose();
}
}
}
