// finds the render object in the fragments' collection
// (the innermost render object containing the point is found)
private RenderObject FindRenderObject(RenderFragmentCollection frags,
PointF pt, float dpix, float dpiy)
{
foreach (RenderFragment rf in frags)
{
RectangleD rd = rf.Document.FromRU(rf.Bounds, UnitTypeEnum.Pixel, dpix, dpiy);
RectangleF rrf = new RectangleF((float)rd.X, (float)rd.Y, (float)rd.Width, (float)rd.Height);
if (rrf.Contains(pt))
{
if (rf.RenderObject.Children.Count > 0)
{
// try to go deeper
pt.X -= (float)rd.Left;
pt.Y -= (float)rd.Top;
RenderObject child = FindRenderObject(rf.Children, pt, dpix, dpiy);
if (child != null)
{
return(child);
}
}
return(rf.RenderObject);
}
}
return(null);
}
private RenderText FindRenderText(RenderFragmentCollection frags, PointF pt, float dpix, float dpiy)
{
foreach (RenderFragment rf in frags)
{
RectangleD rd = rf.Document.FromRU(rf.Bounds, UnitTypeEnum.Pixel, dpix, dpiy);
RectangleF rrf = new RectangleF((float)rd.X, (float)rd.Y, (float)rd.Width, (float)rd.Height);
if (rrf.Contains(pt))
{
if (rf.RenderObject is RenderText)
{
return(rf.RenderObject as RenderText);
}
else
{
pt.X -= (float)rd.Left;
pt.Y -= (float)rd.Top;
return(FindRenderText(rf.Children, pt, dpix, dpiy));
}
}
}
return(null);
}
