public void RemoveSelfFromCanvas(ChemProV.UI.DrawingCanvas owner)
{
// Start by unsubscribing from events on the parent process unit or stream
if (m_commentParent is ProcessUnitControl)
{
(m_commentParent as ProcessUnitControl).ProcessUnit.PropertyChanged -=
this.ProcessUnitParentPropertyChanged;
}
else if (m_commentParent is StreamControl)
{
(m_commentParent as StreamControl).Stream.PropertyChanged -=
this.StreamParentPropertyChanged;
}
m_commentParent = null;
// Now unsubscribe from events on the sticky note object
m_note.PropertyChanged -= this.MemNote_PropertyChanged;
m_note = null;
// Now do the actual removal of controls from the drawing canvas
if (null != m_lineToParent)
{
owner.RemoveChild(m_lineToParent);
m_lineToParent = null;
}
owner.RemoveChild(this);
}
/// <summary>
/// Deletes this sticky note from the workspace and adds an undo to bring it back.
/// </summary>
public void DeleteWithUndo(DrawingCanvas canvas)
{
// Get a reference to the workspace
Workspace ws = canvas.GetWorkspace();
// Start by unsubscribing from events
if (null != m_commentParent)
{
if (m_commentParent is ProcessUnitControl)
{
(m_commentParent as ProcessUnitControl).ProcessUnit.PropertyChanged -=
ProcessUnitParentPropertyChanged;
}
else
{
(m_commentParent as PFD.Streams.StreamControl).Stream.PropertyChanged -=
StreamParentPropertyChanged;
}
}
// Get a reference to the relevant comment collection
IList <StickyNote> comments;
if (null == m_commentParent)
{
comments = ws.StickyNotes;
}
else if (m_commentParent is ProcessUnitControl)
{
comments = (m_commentParent as ProcessUnitControl).ProcessUnit.Comments;
}
else
{
comments = (m_commentParent as ChemProV.PFD.Streams.StreamControl).Stream.Comments;
}
// Find the index of this comment in the parent collection
int commentIndex = -1;
for (int i = 0; i < comments.Count; i++)
{
if (object.ReferenceEquals(m_note, comments[i]))
{
commentIndex = i;
break;
}
}
// This really should never occur, but if we didn't find the comment in the collection
// then this implies that this control shouldn't be on the canvas anyway, so remove it.
if (-1 == commentIndex)
{
canvas.RemoveChild(this);
canvas.RemoveChild(m_lineToParent);
return;
}
// Add the undo first
ws.AddUndo(new UndoRedoCollection(
"Undo deleting comment", new InsertComment(comments, m_note, commentIndex)));
// Remove the comment from the collection. Event handlers will update the UI and remove
// this control (and the line to the parent control) from the drawing canvas.
comments.RemoveAt(commentIndex);
}
