public Paper()
{
// paper properties
Background = new SolidColorBrush(Colors.White);
Cursor = Cursors.IBeam;
// setup caret
caret = new Rectangle();
caret.Fill = new SolidColorBrush(Colors.Black);
caret.Height = 12;
caret.Width = 1;
caret.Margin = new Thickness(-1, 0, 0, 0);
// setup caret timer
caretTimer = new DispatcherTimer();
caretTimer.Interval = TimeSpan.FromSeconds(0.5);
caretTimer.Tick += delegate { caret.Visibility = (caret.Visibility == Visibility.Visible || !ShowCaret) ? Visibility.Collapsed : Visibility.Visible; };
caretTimer.Start();
// setup highlighting indicies
HighlightedBlocks = new List<Character>();
HighlightFromIndex = new Index(0, 0);
HighlightToIndex = new Index(0, 0);
// events
MouseLeftButtonDown += Paper_MouseLeftButtonDown;
MouseLeftButtonUp += Paper_MouseLeftButtonUp;
}
public void HighlightUpto(int line, int pos)
{
var newBlocks = new List<Character>();
if (HighlightToIndex != null && HighlightToIndex.Line == line && HighlightToIndex.Position == pos)
return;
// get blocks
int fromLine = 0, fromPos = 0, toLine = 0, toPos = 0;
PaperLine pLine;
if (HighlightFromIndex.Line == line)
{
pLine = (PaperLine)Children[line];
fromPos = Math.Min(HighlightFromIndex.Position, pos);
toPos = Math.Max(HighlightFromIndex.Position, pos);
newBlocks.AddRange(pLine.GetCharacters(fromPos, toPos));
}
else if (HighlightFromIndex.Line > line)
{
fromLine = line;
toLine = HighlightFromIndex.Line;
for (; fromLine <= toLine; fromLine++)
{
pLine = (PaperLine)Children[fromLine];
fromPos = (fromLine == line) ? pos : 0;
toPos = (fromLine == HighlightFromIndex.Line) ? HighlightFromIndex.Position - 1 : pLine.LastIndex;
newBlocks.AddRange(pLine.GetCharacters(fromPos, toPos));
}
}
else if (HighlightFromIndex.Line < line)
{
fromLine = HighlightFromIndex.Line;
toLine = line;
for (; fromLine <= toLine; fromLine++)
{
pLine = (PaperLine)Children[fromLine];
fromPos = (fromLine == HighlightFromIndex.Line) ? HighlightFromIndex.Position : 0;
toPos = (fromLine == line) ? pos : pLine.LastIndex;
newBlocks.AddRange(pLine.GetCharacters(fromPos, toPos));
}
}
// set CaretPosition
UpdateCaret(line, pos);
// the blocks that are already highlighted, but now need to be unhighlighted
HighlightedBlocks.Except(newBlocks).ToList().ForEach(b => b.Unhighlight());
// highlight the rest
HighlightedBlocks = newBlocks;
foreach (var block in HighlightedBlocks)
{
if (block.CurrentBackgroundState != Character.BackgroundState.Blue)
block.HighlightBlue();
}
// keep track to be used in RemoveHighlights
HighlightToIndex = new Index(line, pos);
}
public void HighlightFrom(int line, int pos)
{
ClearHighlights();
UpdateCaret(line, pos);
HighlightFromIndex = new Index(line, pos);
}