internal void Combine(Line first, Line second) {
LineTag last;
int shift;
// strip the ending off of the first lines text
first.text.Length = first.text.Length - LineEndingLength (first.ending);
// Combine the two tag chains into one
last = first.tags;
// Maintain the line ending style
first.ending = second.ending;
while (last.Next != null) {
last = last.Next;
}
// need to get the shift before setting the next tag since that effects length
shift = last.Start + last.Length - 1;
last.Next = second.tags;
last.Next.Previous = last;
// Fix up references within the chain
last = last.Next;
while (last != null) {
last.Line = first;
last.Start += shift;
last = last.Next;
}
// Combine both lines' strings
first.text.Insert(first.text.Length, second.text.ToString());
first.Grow(first.text.Length);
// Remove the reference to our (now combined) tags from the doomed line
second.tags = null;
// Renumber lines
DecrementLines(first.line_no + 2); // first.line_no + 1 will be deleted, so we need to start renumbering one later
// Mop up
first.recalc = true;
first.height = 0; // This forces RecalcDocument/UpdateView to redraw from this line on
first.Streamline(lines);
// Update Caret, Selection, etc
if (caret.line == second) {
caret.Combine(first, shift);
}
if (selection_anchor.line == second) {
selection_anchor.Combine(first, shift);
}
if (selection_start.line == second) {
selection_start.Combine(first, shift);
}
if (selection_end.line == second) {
selection_end.Combine(first, shift);
}
#if Debug
Line check_first;
Line check_second;
check_first = GetLine(first.line_no);
check_second = GetLine(check_first.line_no + 1);
Console.WriteLine("Pre-delete: Y of first line: {0}, second line: {1}", check_first.Y, check_second.Y);
#endif
this.Delete(second);
#if Debug
check_first = GetLine(first.line_no);
check_second = GetLine(check_first.line_no + 1);
Console.WriteLine("Post-delete Y of first line: {0}, second line: {1}", check_first.Y, check_second.Y);
#endif
}
// Insert multi-line text at the given position; use formatting at insertion point for inserted text
internal void Insert(Line line, int pos, Line insert, bool select)
{
Line current;
LineTag tag;
int offset;
int lines;
Line first;
// Handle special case first
if (insert.right == null) {
// Single line insert
document.Split(line, pos);
if (insert.tags == null) {
return; // Blank line
}
//Insert our tags at the end
tag = line.tags;
while (tag.Next != null) {
tag = tag.Next;
}
offset = tag.Start + tag.Length - 1;
tag.Next = insert.tags;
line.text.Insert(offset, insert.text.ToString());
// Adjust start locations
tag = tag.Next;
while (tag != null) {
tag.Start += offset;
tag.Line = line;
tag = tag.Next;
}
// Put it back together
document.Combine(line.line_no, line.line_no + 1);
if (select) {
document.SetSelectionStart (line, pos, false);
document.SetSelectionEnd (line, pos + insert.text.Length, false);
}
document.UpdateView(line, pos);
return;
}
first = line;
lines = 1;
current = insert;
while (current != null) {
if (current == insert) {
// Inserting the first line we split the line (and make space)
document.Split(line.line_no, pos);
//Insert our tags at the end of the line
tag = line.tags;
if (tag != null && tag.Length != 0) {
while (tag.Next != null) {
tag = tag.Next;
}
offset = tag.Start + tag.Length - 1;
tag.Next = current.tags;
tag.Next.Previous = tag;
tag = tag.Next;
} else {
offset = 0;
line.tags = current.tags;
line.tags.Previous = null;
tag = line.tags;
}
line.ending = current.ending;
} else {
document.Split(line.line_no, 0);
offset = 0;
line.tags = current.tags;
line.tags.Previous = null;
line.ending = current.ending;
tag = line.tags;
}
// Adjust start locations and line pointers
while (tag != null) {
tag.Start += offset - 1;
tag.Line = line;
tag = tag.Next;
}
line.text.Insert(offset, current.text.ToString());
line.Grow(line.text.Length);
line.recalc = true;
line = document.GetLine(line.line_no + 1);
// FIXME? Test undo of line-boundaries
if ((current.right == null) && (current.tags.Length != 0)) {
document.Combine(line.line_no - 1, line.line_no);
}
current = current.right;
lines++;
}
// Recalculate our document
document.UpdateView(first, lines, pos);
return;
}
internal void InsertPicture (Line line, int pos, RTF.Picture picture)
{
//LineTag next_tag;
LineTag tag;
int len;
len = 1;
// Just a place holder basically
line.text.Insert (pos, "I");
PictureTag picture_tag = new PictureTag (line, pos + 1, picture);
tag = LineTag.FindTag (line, pos);
picture_tag.CopyFormattingFrom (tag);
/*next_tag = */tag.Break (pos + 1);
picture_tag.Previous = tag;
picture_tag.Next = tag.Next;
tag.Next = picture_tag;
//
// Picture tags need to be surrounded by text tags
//
if (picture_tag.Next == null) {
picture_tag.Next = new LineTag (line, pos + 1);
picture_tag.Next.CopyFormattingFrom (tag);
picture_tag.Next.Previous = picture_tag;
}
tag = picture_tag.Next;
while (tag != null) {
tag.Start += len;
tag = tag.Next;
}
line.Grow (len);
line.recalc = true;
UpdateView (line, pos);
}