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a272065d84
This propagates the non-inherited (in the nsChangeHint sense, not the CSS inheritance sense) parts of the parent's change hint through ReResolveStyleContext so that we can use them in nsStyleContext::CalcDifference. In the cases where we don't know the parent's hint, we assume the worst, that all the non-inherited hints were present in the parent's style change. This should be a significant performance improvement handling simple style changes (such as a style attribute change setting a non-inherited property) on elements with large numbers of descendants that have data in ForceCompare structs that can't be stored in the rule tree (for example, margins or widths in em or rem units).
203 lines
7.6 KiB
C++
203 lines
7.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim:cindent:ts=2:et:sw=2:
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This Original Code has been modified by IBM Corporation. Modifications made
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* by IBM described herein are Copyright (c) International Business Machines
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* Corporation, 2000. Modifications to Mozilla code or documentation identified
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* per MPL Section 3.3
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*
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* Date Modified by Description of modification
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* 04/20/2000 IBM Corp. OS/2 VisualAge build.
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*/
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/* storage of the frame tree and information about it */
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#ifndef _nsFrameManager_h_
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#define _nsFrameManager_h_
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#include "nsIFrame.h"
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#include "nsIStatefulFrame.h"
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#include "nsChangeHint.h"
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#include "nsFrameManagerBase.h"
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namespace mozilla {
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namespace css {
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class RestyleTracker;
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} // namespace css
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} // namespace mozilla
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struct TreeMatchContext;
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/**
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* Frame manager interface. The frame manager serves two purposes:
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* <li>provides a service for mapping from content to frame and from
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* out-of-flow frame to placeholder frame.
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* <li>handles structural modifications to the frame model. If the frame model
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* lock can be acquired, then the changes are processed immediately; otherwise,
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* they're queued and processed later.
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*
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* Do not add virtual methods to this class, or bryner will punish you.
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*/
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class nsFrameManager : public nsFrameManagerBase
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{
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typedef mozilla::css::RestyleTracker RestyleTracker;
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typedef nsIFrame::ChildListID ChildListID;
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public:
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nsFrameManager(nsIPresShell *aPresShell) NS_HIDDEN {
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mPresShell = aPresShell;
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}
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~nsFrameManager() NS_HIDDEN;
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// Initialization
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NS_HIDDEN_(nsresult) Init(nsStyleSet* aStyleSet);
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/*
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* After Destroy is called, it is an error to call any FrameManager methods.
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* Destroy should be called when the frame tree managed by the frame
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* manager is no longer being displayed.
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*/
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NS_HIDDEN_(void) Destroy();
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// Placeholder frame functions
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NS_HIDDEN_(nsPlaceholderFrame*) GetPlaceholderFrameFor(const nsIFrame* aFrame);
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NS_HIDDEN_(nsresult)
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RegisterPlaceholderFrame(nsPlaceholderFrame* aPlaceholderFrame);
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NS_HIDDEN_(void)
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UnregisterPlaceholderFrame(nsPlaceholderFrame* aPlaceholderFrame);
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NS_HIDDEN_(void) ClearPlaceholderFrameMap();
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// Mapping undisplayed content
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NS_HIDDEN_(nsStyleContext*) GetUndisplayedContent(nsIContent* aContent);
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NS_HIDDEN_(void) SetUndisplayedContent(nsIContent* aContent,
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nsStyleContext* aStyleContext);
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NS_HIDDEN_(void) ChangeUndisplayedContent(nsIContent* aContent,
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nsStyleContext* aStyleContext);
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NS_HIDDEN_(void) ClearUndisplayedContentIn(nsIContent* aContent,
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nsIContent* aParentContent);
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NS_HIDDEN_(void) ClearAllUndisplayedContentIn(nsIContent* aParentContent);
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// Functions for manipulating the frame model
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NS_HIDDEN_(nsresult) AppendFrames(nsIFrame* aParentFrame,
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ChildListID aListID,
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nsFrameList& aFrameList);
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NS_HIDDEN_(nsresult) InsertFrames(nsIFrame* aParentFrame,
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ChildListID aListID,
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nsIFrame* aPrevFrame,
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nsFrameList& aFrameList);
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NS_HIDDEN_(nsresult) RemoveFrame(ChildListID aListID,
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nsIFrame* aOldFrame,
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bool aInvalidate = true);
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/*
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* Notification that a frame is about to be destroyed. This allows any
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* outstanding references to the frame to be cleaned up.
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*/
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NS_HIDDEN_(void) NotifyDestroyingFrame(nsIFrame* aFrame);
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/*
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* Reparent the style contexts of this frame subtree. The parent frame of
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* aFrame must be changed to the new parent before this function is called;
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* the new parent style context will be automatically computed based on the
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* new position in the frame tree.
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*
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* @param aFrame the root of the subtree to reparent. Must not be null.
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*/
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NS_HIDDEN_(nsresult) ReparentStyleContext(nsIFrame* aFrame);
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/*
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* Re-resolve the style contexts for a frame tree, building
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* aChangeList based on the resulting style changes, plus aMinChange
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* applied to aFrame.
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*/
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NS_HIDDEN_(void)
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ComputeStyleChangeFor(nsIFrame* aFrame,
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nsStyleChangeList* aChangeList,
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nsChangeHint aMinChange,
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RestyleTracker& aRestyleTracker,
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bool aRestyleDescendants);
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/*
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* Capture/restore frame state for the frame subtree rooted at aFrame.
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* aState is the document state storage object onto which each frame
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* stores its state. Callers of CaptureFrameState are responsible for
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* traversing next continuations of special siblings of aFrame as
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* needed; this method will only work with actual frametree descendants
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* of aFrame.
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*/
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NS_HIDDEN_(void) CaptureFrameState(nsIFrame* aFrame,
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nsILayoutHistoryState* aState);
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NS_HIDDEN_(void) RestoreFrameState(nsIFrame* aFrame,
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nsILayoutHistoryState* aState);
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/*
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* Add/restore state for one frame
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* (special, global type, like scroll position)
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*/
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NS_HIDDEN_(void) CaptureFrameStateFor(nsIFrame* aFrame,
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nsILayoutHistoryState* aState,
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nsIStatefulFrame::SpecialStateID aID =
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nsIStatefulFrame::eNoID);
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NS_HIDDEN_(void) RestoreFrameStateFor(nsIFrame* aFrame,
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nsILayoutHistoryState* aState,
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nsIStatefulFrame::SpecialStateID aID =
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nsIStatefulFrame::eNoID);
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#ifdef DEBUG
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/**
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* DEBUG ONLY method to verify integrity of style tree versus frame tree
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*/
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NS_HIDDEN_(void) DebugVerifyStyleTree(nsIFrame* aFrame);
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#endif
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NS_HIDDEN_(nsIPresShell*) GetPresShell() const { return mPresShell; }
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NS_HIDDEN_(nsPresContext*) GetPresContext() const {
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return mPresShell->GetPresContext();
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}
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private:
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enum DesiredA11yNotifications {
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eSkipNotifications,
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eSendAllNotifications,
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eNotifyIfShown
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};
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enum A11yNotificationType {
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eDontNotify,
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eNotifyShown,
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eNotifyHidden
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};
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// Use eRestyle_Self for the aRestyleHint argument to mean
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// "reresolve our style context but not kids", use eRestyle_Subtree
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// to mean "reresolve our style context and kids", and use
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// nsRestyleHint(0) to mean recompute a new style context for our
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// current parent and existing rulenode, and the same for kids.
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NS_HIDDEN_(nsChangeHint)
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ReResolveStyleContext(nsPresContext *aPresContext,
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nsIFrame *aFrame,
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nsIContent *aParentContent,
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nsStyleChangeList *aChangeList,
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nsChangeHint aMinChange,
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nsChangeHint aParentFrameHintsNotHandledForDescendants,
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nsRestyleHint aRestyleHint,
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RestyleTracker& aRestyleTracker,
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DesiredA11yNotifications aDesiredA11yNotifications,
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nsTArray<nsIContent*>& aVisibleKidsOfHiddenElement,
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TreeMatchContext &aTreeMatchContext);
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};
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#endif
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