196818 - Reduce memory footprint of XBL based selects

Status: RESOLVED FIXED

(Core :: XUL, defect, P3)

Description

[Jan Varga [:janv]]

If there is a need to reduce memory footprint of trees used in XBL forms, we can
move all dnd specific member variables to a lazily created object

Particularly I mean these variables:
PRPackedBool             mDropAllowed
PRInt32                  mDropRow
PRInt16                  mDropOrient
PRInt16                  mScrollLines
nsCOMPtr<nsIDragSession> mDragSession
nsCOMPtr<nsITimer>       mTimer
nsValueArray             mArray

There is also another possibility to separate code to a base class and then
create two objects which will inherit from the base class.

class nsBodyFrame

class nsTreeBodyFrame : public nsBodyFrame

class nsSelectBodyFrame : public nsBodyFrame

or something like that

Comment 1

[Jan Varga [:janv]]

Fixed along with bug 221619. There's now a new structure mSlots which is created
on demand when the dnd is used.