public void ResetSelection()
{
SelectionStart = null;
SelectionEnd = null;
UpdateSelectionPolygon();
}
PolygonFigure[] CreateSelectionPolygons(SelectionAnchorCaret start, SelectionAnchorCaret end, out Rect bounds)
{
bounds = default;
if (start == null || end == null)
{
return(null);
}
if (start.Anchor.Equals(end.Anchor))
{
return(null);
}
if (start.Anchor.CompareTo(end.Anchor) > 0) // swap when start > end
{
var _ = start;
start = end;
end = _;
}
var content = Owner.Content;
return(FilledFragment.CreatePolygons(
start.Bounds.TopLeft, end.Bounds.TopLeft, content.LineHeight,
content.SnapToPixelsX(content.Metrics.Viewport.Width - content.DpiScale.X), out bounds));
}
public void AdjustSelectionAnchors()
{
bool updated = false;
SelectionStart = UpdateCaret(Owner.Content.SelectionStart, SelectionStart, ref updated);
SelectionEnd = UpdateCaret(Owner.Content.SelectionEnd, SelectionEnd, ref updated);
if (updated)
{
UpdateSelectionPolygon();
}
}
public void SetSelection(SelectionAnchorCaret start, SelectionAnchorCaret end)
{
if (start != null)
{
SelectionStart = start;
Owner.Content.SelectionStart = start.Anchor;
}
SelectionEnd = end;
Owner.Content.SelectionEnd = end.Anchor;
UpdateSelectionPolygon();
}
public void SetSelection(SelectionAnchorCaret caret)
{
var content = Owner.Content;
if (content.SelectionStart == null)
{
SetSelection(caret, caret);
}
else
{
SetSelection(null, caret);
}
}
public bool TrySetSelection(Fragment fragment)
{
if (fragment.IsSelectable)
{
var caret = new SelectionAnchorCaret()
{
Fragment = fragment
};
fragment.Source.PrepareSelectionAnchor(caret);
SetSelection(caret);
if (Owner.Mouse.SelectWholeChunks)
{
SelectionStart = null;
SelectionEnd = null;
var content = Owner.Content;
if (content.SelectionStart.CompareTo(content.SelectionEnd) > 0)
{
if (Owner.Content.SelectionStart.Chunk is Packet startPacket)
{
content.SelectionStart = new SelectionAnchor()
{
Chunk = content.SelectionStart.Chunk, Offset = startPacket.Payload.Length
};;
content.SelectionEnd.Offset = 0;
}
}
else
{
if (Owner.Content.SelectionEnd.Chunk is Packet endPacket)
{
content.SelectionStart.Offset = 0;
content.SelectionEnd = new SelectionAnchor()
{
Chunk = content.SelectionEnd.Chunk, Offset = endPacket.Payload.Length
};
}
}
AdjustSelectionAnchors();
}
return(true);
}
return(false);
}
SelectionAnchorCaret UpdateCaret(SelectionAnchor anchor, SelectionAnchorCaret caret, ref bool updated)
{
if (anchor != null && caret == null)
{
updated = true;
caret = new SelectionAnchorCaret()
{
Anchor = anchor
};
var content = Owner.Content;
if (anchor.Chunk.SequenceNumber < content.TextLayer.Items.FirstOrDefault()?.Source.BaseChunk.SequenceNumber)
{
caret.Bounds = new Rect(0, -content.LineHeight, 0, 0);
}
else if (anchor.Chunk.SequenceNumber > content.TextLayer.Items.LastOrDefault()?.Source.BaseChunk.SequenceNumber)
{
caret.Bounds = new Rect(0, Math.Max(content.Metrics.Viewport.Height, content.TextLayer.Height) + content.LineHeight, 0, 0);
}
else
{
var chunkView = content.TryGetChunkView(anchor.Chunk.SequenceNumber);
if (chunkView != null)
{
if (chunkView.FirstFragmentIndex != -1 && chunkView.LastFragmentIndex != -1)
{
chunkView.PrepareSelectionAnchor(caret);
}
else
{
Debug.Assert(false);
}
}
}
}
return(caret);
}