private void inkoverlay_StrokesDeleting(object sender, InkOverlayStrokesDeletingEventArgs e)
{
dbg.WriteLine("----- inkoverlay_StrokesDeleting -----");
// Ensure we're on the UI thread.
dbg.Assert(!this.InvokeRequired);
// Track region to repaint.
Rectangle dirtybbox = Rectangle.Empty;
try // To prevent exceptions from propagating back to ink runtime.
{
// Get objects for stroke(s) to delete.
RigidBodyBase[] bodies = doc.GetBodiesFor(e.StrokesToDelete);
MechanismBase[] mechs = doc.GetMechanismsFor(e.StrokesToDelete);
// Delete mechanisms.
foreach (MechanismBase mech in mechs)
{
doc.Mechanisms.Remove(mech);
dirtybbox = Rectangle.Union(dirtybbox, mech.BoundingBox);
}
// Delete bodies and their attached mechanisms.
foreach (RigidBodyBase body in bodies)
{
mechs = doc.GetMechanismsForBody(body);
foreach (MechanismBase mech in mechs)
{
doc.Mechanisms.Remove(mech);
dirtybbox = Rectangle.Union(dirtybbox, mech.BoundingBox);
Strokes mstrokes = doc.Ink.CreateStrokes(new int[] { mech.strokeid });
doc.Ink.DeleteStrokes(mstrokes);
}
doc.Bodies.Remove(body);
dirtybbox = Rectangle.Union(dirtybbox, body.BoundingBox);
}
// Check if this stroke was the gravity vector's?
if (doc.Gravity != null)
{
foreach (Stroke s in e.StrokesToDelete)
{
if (s.Id == doc.Gravity.strokeid)
{
this.InvalidateInkSpaceRectangle(doc.Gravity.BoundingBox);
doc.Gravity = null;
}
}
}
}
catch (Exception ex)
{
// Log the error.
Global.HandleThreadException(this, new System.Threading.ThreadExceptionEventArgs(ex));
}
finally
{
// Repaint the affected area.
InvalidateInkSpaceRectangle(dirtybbox);
}
}
