зеркало из https://github.com/mozilla/pjs.git
235 строки
9.1 KiB
C++
235 строки
9.1 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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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Pierre Phaneuf <pp@ludusdesign.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK *****
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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 NS_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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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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