internal static void InsertText(string insertedText, QText tb)
{
try
{
tb.Selection.BeginUpdate();
char cc = '\x0';
if (tb.LinesCount == 0)
InsertCharCommand.InsertLine(tb);
tb.ExpandBlock(tb.Selection.Start.iLine);
foreach (char c in insertedText)
InsertCharCommand.InsertChar(c, ref cc, tb);
tb.needRecalc = true;
}
finally
{
tb.Selection.EndUpdate();
}
}
internal static void InsertChar(char c, ref char deletedChar, QText tb)
{
switch (c)
{
case '\n':
if (tb.LinesCount == 0) InsertLine(tb);
InsertLine(tb);
break;
case '\r': break;
case '\b'://backspace
if (tb.Selection.Start.iChar == 0 && tb.Selection.Start.iLine == 0) return;
if (tb.Selection.Start.iChar == 0)
{
if (tb[tb.Selection.Start.iLine - 1].VisibleState != VisibleState.Visible) tb.ExpandBlock(tb.Selection.Start.iLine - 1);
deletedChar = '\n';
MergeLines(tb.Selection.Start.iLine - 1, tb);
}
else
{
deletedChar = tb[tb.Selection.Start.iLine][tb.Selection.Start.iChar - 1].c;
tb[tb.Selection.Start.iLine].RemoveAt(tb.Selection.Start.iChar - 1);
tb.Selection.Start = new Place(tb.Selection.Start.iChar - 1, tb.Selection.Start.iLine);
}
break;
default:
tb[tb.Selection.Start.iLine].Insert(tb.Selection.Start.iChar, new Char(c));
tb.Selection.Start = new Place(tb.Selection.Start.iChar + 1, tb.Selection.Start.iLine);
break;
}
}
internal static void MergeLines(int i, QText tb)
{
if (i + 1 >= tb.LinesCount) return;
tb.ExpandBlock(i);
tb.ExpandBlock(i + 1);
int pos = tb[i].Count;
//
if (tb[i].Count == 0)
tb.RemoveLine(i);
else
if (tb[i + 1].Count == 0)
tb.RemoveLine(i + 1);
else
{
tb[i].AddRange(tb[i + 1]);
tb.RemoveLine(i + 1);
}
tb.Selection.Start = new Place(pos, i);
tb.needRecalc = true;
}