gecko/layout/base/nsFrameManager.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim:cindent:ts=2:et:sw=2:
*
2012-05-21 04:12:37 -07:00
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This Original Code has been modified by IBM Corporation. Modifications made
* by IBM described herein are Copyright (c) International Business Machines
* Corporation, 2000. Modifications to Mozilla code or documentation identified
* per MPL Section 3.3
*
* Date Modified by Description of modification
* 04/20/2000 IBM Corp. OS/2 VisualAge build.
*/
/* storage of the frame tree and information about it */
#ifndef _nsFrameManager_h_
#define _nsFrameManager_h_
#include "nsIFrame.h"
#include "nsIStatefulFrame.h"
#include "nsChangeHint.h"
#include "nsFrameManagerBase.h"
namespace mozilla {
/**
* Node in a linked list, containing the style for an element that
* does not have a frame but whose parent does have a frame.
*/
struct UndisplayedNode {
UndisplayedNode(nsIContent* aContent, nsStyleContext* aStyle)
: mContent(aContent),
mStyle(aStyle),
mNext(nullptr)
{
MOZ_COUNT_CTOR(mozilla::UndisplayedNode);
}
NS_HIDDEN ~UndisplayedNode()
{
MOZ_COUNT_DTOR(mozilla::UndisplayedNode);
// Delete mNext iteratively to avoid blowing up the stack (bug 460461).
UndisplayedNode* cur = mNext;
while (cur) {
UndisplayedNode* next = cur->mNext;
cur->mNext = nullptr;
delete cur;
cur = next;
}
}
nsCOMPtr<nsIContent> mContent;
nsRefPtr<nsStyleContext> mStyle;
UndisplayedNode* mNext;
};
} // namespace mozilla
/**
* Frame manager interface. The frame manager serves two purposes:
* <li>provides a service for mapping from content to frame and from
* out-of-flow frame to placeholder frame.
* <li>handles structural modifications to the frame model. If the frame model
* lock can be acquired, then the changes are processed immediately; otherwise,
* they're queued and processed later.
*
* Do not add virtual methods to this class, or bryner will punish you.
*/
class nsFrameManager : public nsFrameManagerBase
{
typedef nsIFrame::ChildListID ChildListID;
public:
nsFrameManager(nsIPresShell *aPresShell, nsStyleSet* aStyleSet) NS_HIDDEN {
mPresShell = aPresShell;
mStyleSet = aStyleSet;
MOZ_ASSERT(mPresShell, "need a pres shell");
MOZ_ASSERT(mStyleSet, "need a style set");
}
~nsFrameManager() NS_HIDDEN;
/*
* After Destroy is called, it is an error to call any FrameManager methods.
* Destroy should be called when the frame tree managed by the frame
* manager is no longer being displayed.
*/
NS_HIDDEN_(void) Destroy();
// Placeholder frame functions
NS_HIDDEN_(nsPlaceholderFrame*) GetPlaceholderFrameFor(const nsIFrame* aFrame);
NS_HIDDEN_(nsresult)
RegisterPlaceholderFrame(nsPlaceholderFrame* aPlaceholderFrame);
NS_HIDDEN_(void)
UnregisterPlaceholderFrame(nsPlaceholderFrame* aPlaceholderFrame);
NS_HIDDEN_(void) ClearPlaceholderFrameMap();
// Mapping undisplayed content
NS_HIDDEN_(nsStyleContext*) GetUndisplayedContent(nsIContent* aContent);
NS_HIDDEN_(mozilla::UndisplayedNode*)
GetAllUndisplayedContentIn(nsIContent* aParentContent);
NS_HIDDEN_(void) SetUndisplayedContent(nsIContent* aContent,
nsStyleContext* aStyleContext);
NS_HIDDEN_(void) ChangeUndisplayedContent(nsIContent* aContent,
nsStyleContext* aStyleContext);
NS_HIDDEN_(void) ClearUndisplayedContentIn(nsIContent* aContent,
nsIContent* aParentContent);
NS_HIDDEN_(void) ClearAllUndisplayedContentIn(nsIContent* aParentContent);
// Functions for manipulating the frame model
NS_HIDDEN_(nsresult) AppendFrames(nsIFrame* aParentFrame,
ChildListID aListID,
nsFrameList& aFrameList);
NS_HIDDEN_(nsresult) InsertFrames(nsIFrame* aParentFrame,
ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList);
NS_HIDDEN_(nsresult) RemoveFrame(ChildListID aListID,
nsIFrame* aOldFrame);
/*
* Notification that a frame is about to be destroyed. This allows any
* outstanding references to the frame to be cleaned up.
*/
NS_HIDDEN_(void) NotifyDestroyingFrame(nsIFrame* aFrame);
/*
* Capture/restore frame state for the frame subtree rooted at aFrame.
* aState is the document state storage object onto which each frame
* stores its state. Callers of CaptureFrameState are responsible for
* traversing next continuations of special siblings of aFrame as
* needed; this method will only work with actual frametree descendants
* of aFrame.
*/
NS_HIDDEN_(void) CaptureFrameState(nsIFrame* aFrame,
nsILayoutHistoryState* aState);
NS_HIDDEN_(void) RestoreFrameState(nsIFrame* aFrame,
nsILayoutHistoryState* aState);
/*
* Add/restore state for one frame
*/
NS_HIDDEN_(void) CaptureFrameStateFor(nsIFrame* aFrame,
nsILayoutHistoryState* aState);
NS_HIDDEN_(void) RestoreFrameStateFor(nsIFrame* aFrame,
nsILayoutHistoryState* aState);
NS_HIDDEN_(nsIPresShell*) GetPresShell() const { return mPresShell; }
NS_HIDDEN_(nsPresContext*) GetPresContext() const {
return mPresShell->GetPresContext();
}
};
#endif