mirror of
https://github.com/classilla/tenfourfox.git
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227 lines
7.5 KiB
C
227 lines
7.5 KiB
C
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/* -*- 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 "nsFrameManagerBase.h"
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#include "nsAutoPtr.h"
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#include "nsFrameList.h"
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#include "nsIContent.h"
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#include "nsStyleContext.h"
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class nsContainerFrame;
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class nsPlaceholderFrame;
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namespace mozilla {
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/**
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* Node in a linked list, containing the style for an element that
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* does not have a frame but whose parent does have a frame.
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*/
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struct UndisplayedNode {
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UndisplayedNode(nsIContent* aContent, nsStyleContext* aStyle)
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: mContent(aContent),
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mStyle(aStyle),
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mNext(nullptr)
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{
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MOZ_COUNT_CTOR(mozilla::UndisplayedNode);
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}
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~UndisplayedNode()
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{
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MOZ_COUNT_DTOR(mozilla::UndisplayedNode);
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// Delete mNext iteratively to avoid blowing up the stack (bug 460461).
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UndisplayedNode* cur = mNext;
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while (cur) {
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UndisplayedNode* next = cur->mNext;
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cur->mNext = nullptr;
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delete cur;
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cur = next;
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}
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}
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nsCOMPtr<nsIContent> mContent;
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RefPtr<nsStyleContext> mStyle;
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UndisplayedNode* mNext;
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};
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} // namespace mozilla
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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 (a vtable pointer) or members to this class, or
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* else you'll break the validity of the reinterpret_cast in nsIPresShell's
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* FrameManager() method.
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*/
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class nsFrameManager : public nsFrameManagerBase
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{
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typedef mozilla::layout::FrameChildListID ChildListID;
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public:
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explicit nsFrameManager(nsIPresShell* aPresShell) {
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mPresShell = aPresShell;
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MOZ_ASSERT(mPresShell, "need a pres shell");
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}
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~nsFrameManager();
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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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void Destroy();
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// Placeholder frame functions
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nsPlaceholderFrame* GetPlaceholderFrameFor(const nsIFrame* aFrame);
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nsresult
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RegisterPlaceholderFrame(nsPlaceholderFrame* aPlaceholderFrame);
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void
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UnregisterPlaceholderFrame(nsPlaceholderFrame* aPlaceholderFrame);
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void ClearPlaceholderFrameMap();
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// Mapping undisplayed content
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nsStyleContext* GetUndisplayedContent(nsIContent* aContent)
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{
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if (!mUndisplayedMap) {
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return nullptr;
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}
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return GetStyleContextInMap(mUndisplayedMap, aContent);
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}
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mozilla::UndisplayedNode*
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GetAllUndisplayedContentIn(nsIContent* aParentContent);
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void SetUndisplayedContent(nsIContent* aContent,
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nsStyleContext* aStyleContext);
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void ChangeUndisplayedContent(nsIContent* aContent,
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nsStyleContext* aStyleContext)
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{
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ChangeStyleContextInMap(mUndisplayedMap, aContent, aStyleContext);
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}
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void ClearUndisplayedContentIn(nsIContent* aContent,
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nsIContent* aParentContent);
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void ClearAllUndisplayedContentIn(nsIContent* aParentContent);
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// display:contents related methods:
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/**
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* Return the registered display:contents style context for aContent, if any.
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*/
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nsStyleContext* GetDisplayContentsStyleFor(nsIContent* aContent)
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{
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if (!mDisplayContentsMap) {
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return nullptr;
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}
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return GetStyleContextInMap(mDisplayContentsMap, aContent);
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}
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/**
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* Return the linked list of UndisplayedNodes containing the registered
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* display:contents children of aParentContent, if any.
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*/
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mozilla::UndisplayedNode* GetAllDisplayContentsIn(nsIContent* aParentContent);
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/**
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* Register aContent having a display:contents style context.
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*/
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void SetDisplayContents(nsIContent* aContent,
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nsStyleContext* aStyleContext);
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/**
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* Change the registered style context for aContent to aStyleContext.
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*/
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void ChangeDisplayContents(nsIContent* aContent,
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nsStyleContext* aStyleContext)
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{
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ChangeStyleContextInMap(mDisplayContentsMap, aContent, aStyleContext);
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}
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/**
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* Unregister the display:contents style context for aContent, if any.
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* If found, then also unregister any display:contents and display:none
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* style contexts for its descendants.
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*/
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void ClearDisplayContentsIn(nsIContent* aContent,
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nsIContent* aParentContent);
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void ClearAllDisplayContentsIn(nsIContent* aParentContent);
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// Functions for manipulating the frame model
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void AppendFrames(nsContainerFrame* aParentFrame,
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ChildListID aListID,
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nsFrameList& aFrameList);
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void InsertFrames(nsContainerFrame* aParentFrame,
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ChildListID aListID,
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nsIFrame* aPrevFrame,
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nsFrameList& aFrameList);
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void RemoveFrame(ChildListID aListID,
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nsIFrame* aOldFrame);
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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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void NotifyDestroyingFrame(nsIFrame* aFrame);
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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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void CaptureFrameState(nsIFrame* aFrame,
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nsILayoutHistoryState* aState);
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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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*/
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void CaptureFrameStateFor(nsIFrame* aFrame,
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nsILayoutHistoryState* aState);
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void RestoreFrameStateFor(nsIFrame* aFrame,
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nsILayoutHistoryState* aState);
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protected:
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static nsStyleContext* GetStyleContextInMap(UndisplayedMap* aMap,
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nsIContent* aContent);
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static mozilla::UndisplayedNode*
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GetAllUndisplayedNodesInMapFor(UndisplayedMap* aMap,
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nsIContent* aParentContent);
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static void SetStyleContextInMap(UndisplayedMap* aMap,
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nsIContent* aContent,
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nsStyleContext* aStyleContext);
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static void ChangeStyleContextInMap(UndisplayedMap* aMap,
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nsIContent* aContent,
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nsStyleContext* aStyleContext);
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};
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#endif
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