Gecko:Frame Destruction - Revision history

Roc: /* Gecko frame destruction invariants */

2009-05-01T23:13:33Z

Gecko frame destruction invariants

← Older revision		Revision as of 23:13, 1 May 2009
Line 7:		Line 7:
	# Find the primary frame P		# Find the primary frame P
	# DeletingFrameSubtree: For all in-flow frames under P or its continuations, if the frame is a placeholder whose out-of-flow is not under the placeholder's P continuation ancestor, remove the mapping from the out-of-flow to the placeholder and remove the frame subtree via RemoveFrame. RemoveFrame breaks the mapping from placeholders to outOfFlows for floats, but not for abs-pos frames.		# DeletingFrameSubtree: For all in-flow frames under P or its continuations, if the frame is a placeholder whose out-of-flow is not under the placeholder's P continuation ancestor, remove the mapping from the out-of-flow to the placeholder and remove the frame subtree via RemoveFrame. RemoveFrame breaks the mapping from placeholders to outOfFlows for floats, but not for abs-pos frames.
	# RemoveFrame implementations usually start by removing the next continuation		# RemoveFrame implementations usually start by removing the next continuation if there is one via DeleteNextInFlowChild, and then removing the frame and calling Destroy on it, which recursively destroys children.
	if there is one via DeleteNextInFlowChild, and then removing the frame and calling Destroy on it, which recursively destroys children.
	# nsBlockFrame::RemoveFrame for in-flow frames finds the first frame to remove in the line list, then removes the frames in flow order.		# nsBlockFrame::RemoveFrame for in-flow frames finds the first frame to remove in the line list, then removes the frames in flow order.

Roc: /* Gecko frame destruction invariants */

2009-05-01T23:13:10Z

Gecko frame destruction invariants

← Older revision		Revision as of 23:13, 1 May 2009
Line 1:		Line 1:
	== Gecko frame destruction invariants ==		== Gecko frame destruction invariants ==

	* nsIFrame::RemoveFrame deletes a frame, all its descendants, and all their		* nsIFrame::RemoveFrame deletes a frame, all its descendants, and all their continuations
	continuations		* Before a placeholder frame is destroyed, its out-of-flow frame is removed. Sometimes the placeholder has a dangling reference to the out-of-flow, though!
	* Before a placeholder frame is destroyed, its out-of-flow frame is removed.
	Sometimes the placeholder has a dangling reference to the out-of-flow,
	though!

	To remove the frames for an element, we		To remove the frames for an element, we

Roc at 23:11, 1 May 2009

2009-05-01T23:11:43Z

← Older revision		Revision as of 23:11, 1 May 2009
Line 9:		Line 9:
	To remove the frames for an element, we		To remove the frames for an element, we
	# Find the primary frame P		# Find the primary frame P
	# DeletingFrameSubtree: For all in-flow frames under P or its continuations,		# DeletingFrameSubtree: For all in-flow frames under P or its continuations, if the frame is a placeholder whose out-of-flow is not under the placeholder's P continuation ancestor, remove the mapping from the out-of-flow to the placeholder and remove the frame subtree via RemoveFrame. RemoveFrame breaks the mapping from placeholders to outOfFlows for floats, but not for abs-pos frames.
	if the frame is a placeholder whose out-of-flow is not under the placeholder's
	P continuation ancestor, remove the mapping from the out-of-flow to the
	placeholder and remove the frame subtree via RemoveFrame. RemoveFrame
	breaks the mapping from placeholders to outOfFlows for floats, but not
	for abs-pos frames.
	# RemoveFrame implementations usually start by removing the next continuation		# RemoveFrame implementations usually start by removing the next continuation
	if there is one via DeleteNextInFlowChild, and then removing the frame and calling Destroy on it, which recursively destroys children.		if there is one via DeleteNextInFlowChild, and then removing the frame and calling Destroy on it, which recursively destroys children.
	# nsBlockFrame::RemoveFrame for in-flow frames finds the first frame to		# nsBlockFrame::RemoveFrame for in-flow frames finds the first frame to remove in the line list, then removes the frames in flow order.
	remove in the line list, then removes the frames in flow order.

Roc: Created page with '== Gecko frame destruction invariants == * nsIFrame::RemoveFrame deletes a frame, all its descendants, and all their continuations * Before a placeholder frame is destroyed, its...'

2009-05-01T23:10:09Z

Created page with '== Gecko frame destruction invariants == * nsIFrame::RemoveFrame deletes a frame, all its descendants, and all their continuations * Before a placeholder frame is destroyed, its...'

New page

== Gecko frame destruction invariants ==

* nsIFrame::RemoveFrame deletes a frame, all its descendants, and all their
continuations
* Before a placeholder frame is destroyed, its out-of-flow frame is removed.
Sometimes the placeholder has a dangling reference to the out-of-flow,
though!

To remove the frames for an element, we
# Find the primary frame P
# DeletingFrameSubtree: For all in-flow frames under P or its continuations,
if the frame is a placeholder whose out-of-flow is not under the placeholder's
P continuation ancestor, remove the mapping from the out-of-flow to the
placeholder and remove the frame subtree via RemoveFrame. RemoveFrame
breaks the mapping from placeholders to outOfFlows for floats, but not
for abs-pos frames.
# RemoveFrame implementations usually start by removing the next continuation
if there is one via DeleteNextInFlowChild, and then removing the frame and calling Destroy on it, which recursively destroys children.
# nsBlockFrame::RemoveFrame for in-flow frames finds the first frame to
remove in the line list, then removes the frames in flow order.