зеркало из https://github.com/mozilla/gecko-dev.git
590 строки
21 KiB
C++
590 строки
21 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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* David Hyatt <hyatt@netscape.com>
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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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/* the interface (to internal code) for retrieving computed style data */
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#include "nsStyleConsts.h"
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#include "nsString.h"
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#include "nsPresContext.h"
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#include "nsIStyleRule.h"
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#include "nsCOMPtr.h"
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#include "nsStyleSet.h"
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#include "nsIPresShell.h"
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#include "nsRuleNode.h"
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#include "nsStyleContext.h"
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#include "prlog.h"
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#ifdef DEBUG
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// #define NOISY_DEBUG
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#endif
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//----------------------------------------------------------------------
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nsStyleContext::nsStyleContext(nsStyleContext* aParent,
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nsIAtom* aPseudoTag,
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nsCSSPseudoElements::Type aPseudoType,
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nsRuleNode* aRuleNode,
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nsPresContext* aPresContext)
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: mParent(aParent),
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mChild(nsnull),
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mEmptyChild(nsnull),
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mPseudoTag(aPseudoTag),
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mRuleNode(aRuleNode),
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mBits(((PRUint32)aPseudoType) << NS_STYLE_CONTEXT_TYPE_SHIFT),
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mRefCnt(0)
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{
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PR_STATIC_ASSERT((PR_UINT32_MAX >> NS_STYLE_CONTEXT_TYPE_SHIFT) >
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nsCSSPseudoElements::ePseudo_MAX);
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mNextSibling = this;
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mPrevSibling = this;
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if (mParent) {
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mParent->AddRef();
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mParent->AddChild(this);
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#ifdef DEBUG
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nsRuleNode *r1 = mParent->GetRuleNode(), *r2 = aRuleNode;
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while (r1->GetParent())
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r1 = r1->GetParent();
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while (r2->GetParent())
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r2 = r2->GetParent();
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NS_ASSERTION(r1 == r2, "must be in the same rule tree as parent");
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#endif
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}
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ApplyStyleFixups(aPresContext);
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#define eStyleStruct_LastItem (nsStyleStructID_Length - 1)
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NS_ASSERTION(NS_STYLE_INHERIT_MASK & NS_STYLE_INHERIT_BIT(LastItem),
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"NS_STYLE_INHERIT_MASK must be bigger, and other bits shifted");
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#undef eStyleStruct_LastItem
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mRuleNode->AddRef();
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}
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nsStyleContext::~nsStyleContext()
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{
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NS_ASSERTION((nsnull == mChild) && (nsnull == mEmptyChild), "destructing context with children");
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nsPresContext *presContext = mRuleNode->GetPresContext();
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mRuleNode->Release();
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presContext->PresShell()->StyleSet()->
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NotifyStyleContextDestroyed(presContext, this);
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if (mParent) {
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mParent->RemoveChild(this);
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mParent->Release();
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}
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// Free up our data structs.
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if (mCachedStyleData.mResetData || mCachedStyleData.mInheritedData) {
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mCachedStyleData.Destroy(mBits, presContext);
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}
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}
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void nsStyleContext::AddChild(nsStyleContext* aChild)
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{
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NS_ASSERTION(aChild->mPrevSibling == aChild &&
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aChild->mNextSibling == aChild,
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"child already in a child list");
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nsStyleContext **list = aChild->mRuleNode->IsRoot() ? &mEmptyChild : &mChild;
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// Insert at the beginning of the list. See also FindChildWithRules.
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if (*list) {
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// Link into existing elements, if there are any.
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aChild->mNextSibling = (*list);
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aChild->mPrevSibling = (*list)->mPrevSibling;
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(*list)->mPrevSibling->mNextSibling = aChild;
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(*list)->mPrevSibling = aChild;
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}
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(*list) = aChild;
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}
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void nsStyleContext::RemoveChild(nsStyleContext* aChild)
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{
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NS_PRECONDITION(nsnull != aChild && this == aChild->mParent, "bad argument");
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nsStyleContext **list = aChild->mRuleNode->IsRoot() ? &mEmptyChild : &mChild;
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if (aChild->mPrevSibling != aChild) { // has siblings
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if ((*list) == aChild) {
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(*list) = (*list)->mNextSibling;
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}
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}
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else {
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NS_ASSERTION((*list) == aChild, "bad sibling pointers");
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(*list) = nsnull;
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}
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aChild->mPrevSibling->mNextSibling = aChild->mNextSibling;
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aChild->mNextSibling->mPrevSibling = aChild->mPrevSibling;
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aChild->mNextSibling = aChild;
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aChild->mPrevSibling = aChild;
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}
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already_AddRefed<nsStyleContext>
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nsStyleContext::FindChildWithRules(const nsIAtom* aPseudoTag,
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nsRuleNode* aRuleNode)
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{
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PRUint32 threshold = 10; // The # of siblings we're willing to examine
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// before just giving this whole thing up.
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nsStyleContext* result = nsnull;
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nsStyleContext *list = aRuleNode->IsRoot() ? mEmptyChild : mChild;
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if (list) {
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nsStyleContext *child = list;
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do {
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if (child->mRuleNode == aRuleNode && child->mPseudoTag == aPseudoTag) {
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result = child;
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break;
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}
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child = child->mNextSibling;
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threshold--;
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if (threshold == 0)
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break;
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} while (child != list);
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}
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if (result) {
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if (result != list) {
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// Move result to the front of the list.
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RemoveChild(result);
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AddChild(result);
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}
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// Add reference for the caller.
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result->AddRef();
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}
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return result;
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}
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const void* nsStyleContext::GetStyleData(nsStyleStructID aSID)
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{
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const void* cachedData = mCachedStyleData.GetStyleData(aSID);
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if (cachedData)
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return cachedData; // We have computed data stored on this node in the context tree.
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return mRuleNode->GetStyleData(aSID, this, PR_TRUE); // Our rule node will take care of it for us.
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}
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#define STYLE_STRUCT(name_, checkdata_cb_, ctor_args_) \
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const nsStyle##name_ * nsStyleContext::GetStyle##name_ () \
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{ \
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const nsStyle##name_ * cachedData = mCachedStyleData.GetStyle##name_(); \
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if (cachedData) \
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return cachedData; /* We have computed data stored on this node */ \
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/* in the context tree. */ \
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/* Else our rule node will take care of it for us. */ \
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return mRuleNode->GetStyle##name_(this, PR_TRUE); \
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}
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#include "nsStyleStructList.h"
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#undef STYLE_STRUCT
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const void* nsStyleContext::PeekStyleData(nsStyleStructID aSID)
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{
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const void* cachedData = mCachedStyleData.GetStyleData(aSID);
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if (cachedData)
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return cachedData; // We have computed data stored on this node in the context tree.
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return mRuleNode->GetStyleData(aSID, this, PR_FALSE); // Our rule node will take care of it for us.
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}
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// This is an evil evil function, since it forces you to alloc your own separate copy of
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// style data! Do not use this function unless you absolutely have to! You should avoid
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// this at all costs! -dwh
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void*
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nsStyleContext::GetUniqueStyleData(const nsStyleStructID& aSID)
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{
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// If we already own the struct and no kids could depend on it, then
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// just return it. (We leak in this case if there are kids -- and this
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// function really shouldn't be called for style contexts that could
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// have kids depending on the data. ClearStyleData would be OK, but
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// this test for no mChild or mEmptyChild doesn't catch that case.)
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const void *current = GetStyleData(aSID);
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if (!mChild && !mEmptyChild &&
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!(mBits & nsCachedStyleData::GetBitForSID(aSID)) &&
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mCachedStyleData.GetStyleData(aSID))
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return const_cast<void*>(current);
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void* result;
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nsPresContext *presContext = PresContext();
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switch (aSID) {
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#define UNIQUE_CASE(c_) \
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case eStyleStruct_##c_: \
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result = new (presContext) nsStyle##c_( \
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* static_cast<const nsStyle##c_ *>(current)); \
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break;
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UNIQUE_CASE(Display)
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UNIQUE_CASE(Background)
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UNIQUE_CASE(Text)
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UNIQUE_CASE(TextReset)
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#undef UNIQUE_CASE
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default:
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NS_ERROR("Struct type not supported. Please find another way to do this if you can!\n");
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return nsnull;
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}
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if (!result) {
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NS_WARNING("Ran out of memory while trying to allocate memory for a unique style struct! "
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"Returning the non-unique data.");
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return const_cast<void*>(current);
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}
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SetStyle(aSID, result);
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mBits &= ~nsCachedStyleData::GetBitForSID(aSID);
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return result;
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}
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void
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nsStyleContext::SetStyle(nsStyleStructID aSID, void* aStruct)
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{
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// This method should only be called from nsRuleNode! It is not a public
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// method!
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NS_ASSERTION(aSID >= 0 && aSID < nsStyleStructID_Length, "out of bounds");
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// NOTE: nsCachedStyleData::GetStyleData works roughly the same way.
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// See the comments there (in nsRuleNode.h) for more details about
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// what this is doing and why.
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const nsCachedStyleData::StyleStructInfo& info =
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nsCachedStyleData::gInfo[aSID];
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char* resetOrInheritSlot = reinterpret_cast<char*>(&mCachedStyleData) +
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info.mCachedStyleDataOffset;
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char* resetOrInherit = reinterpret_cast<char*>
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(*reinterpret_cast<void**>(resetOrInheritSlot));
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if (!resetOrInherit) {
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nsPresContext *presContext = mRuleNode->GetPresContext();
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if (mCachedStyleData.IsReset(aSID)) {
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mCachedStyleData.mResetData = new (presContext) nsResetStyleData;
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resetOrInherit = reinterpret_cast<char*>(mCachedStyleData.mResetData);
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} else {
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mCachedStyleData.mInheritedData =
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new (presContext) nsInheritedStyleData;
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resetOrInherit =
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reinterpret_cast<char*>(mCachedStyleData.mInheritedData);
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}
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}
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char* dataSlot = resetOrInherit + info.mInheritResetOffset;
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NS_ASSERTION(!*reinterpret_cast<void**>(dataSlot) ||
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(mBits & nsCachedStyleData::GetBitForSID(aSID)),
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"Going to leak style data");
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*reinterpret_cast<void**>(dataSlot) = aStruct;
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}
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void
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nsStyleContext::ApplyStyleFixups(nsPresContext* aPresContext)
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{
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// See if we have any text decorations.
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// First see if our parent has text decorations. If our parent does, then we inherit the bit.
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if (mParent && mParent->HasTextDecorations())
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mBits |= NS_STYLE_HAS_TEXT_DECORATIONS;
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else {
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// We might have defined a decoration.
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const nsStyleTextReset* text = GetStyleTextReset();
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if (text->mTextDecoration != NS_STYLE_TEXT_DECORATION_NONE &&
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text->mTextDecoration != NS_STYLE_TEXT_DECORATION_OVERRIDE_ALL)
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mBits |= NS_STYLE_HAS_TEXT_DECORATIONS;
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}
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if ((mParent && mParent->HasPseudoElementData()) || mPseudoTag) {
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mBits |= NS_STYLE_HAS_PSEUDO_ELEMENT_DATA;
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}
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// Correct tables.
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const nsStyleDisplay* disp = GetStyleDisplay();
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if (disp->mDisplay == NS_STYLE_DISPLAY_TABLE) {
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// -moz-center and -moz-right are used for HTML's alignment
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// This is covering the <div align="right"><table>...</table></div> case.
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// In this case, we don't want to inherit the text alignment into the table.
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const nsStyleText* text = GetStyleText();
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if (text->mTextAlign == NS_STYLE_TEXT_ALIGN_MOZ_CENTER ||
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text->mTextAlign == NS_STYLE_TEXT_ALIGN_MOZ_RIGHT)
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{
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nsStyleText* uniqueText = (nsStyleText*)GetUniqueStyleData(eStyleStruct_Text);
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uniqueText->mTextAlign = NS_STYLE_TEXT_ALIGN_DEFAULT;
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}
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}
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// CSS2.1 section 9.2.4 specifies fixups for the 'display' property of
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// the root element. We can't implement them in nsRuleNode because we
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// don't want to store all display structs that aren't 'block',
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// 'inline', or 'table' in the style context tree on the off chance
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// that the root element has its style reresolved later. So do them
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// here if needed, by changing the style data, so that other code
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// doesn't get confused by looking at the style data.
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if (!mParent) {
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if (disp->mDisplay != NS_STYLE_DISPLAY_NONE &&
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disp->mDisplay != NS_STYLE_DISPLAY_BLOCK &&
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disp->mDisplay != NS_STYLE_DISPLAY_TABLE) {
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nsStyleDisplay *mutable_display = static_cast<nsStyleDisplay*>
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(GetUniqueStyleData(eStyleStruct_Display));
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if (mutable_display->mDisplay == NS_STYLE_DISPLAY_INLINE_TABLE)
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mutable_display->mDisplay = NS_STYLE_DISPLAY_TABLE;
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else
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mutable_display->mDisplay = NS_STYLE_DISPLAY_BLOCK;
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}
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}
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// Computer User Interface style, to trigger loads of cursors
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GetStyleUserInterface();
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}
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nsChangeHint
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nsStyleContext::CalcStyleDifference(nsStyleContext* aOther)
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{
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nsChangeHint hint = NS_STYLE_HINT_NONE;
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NS_ENSURE_TRUE(aOther, hint);
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// We must always ensure that we populate the structs on the new style
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// context that are filled in on the old context, so that if we get
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// two style changes in succession, the second of which causes a real
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// style change, the PeekStyleData doesn't return null (implying that
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// nobody ever looked at that struct's data). In other words, we
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// can't skip later structs if we get a big change up front, because
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// we could later get a small change in one of those structs that we
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// don't want to miss.
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// If our rule nodes are the same, then we are looking at the same
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// style data. We know this because CalcStyleDifference is always
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// called on two style contexts that point to the same element, so we
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// know that our position in the style context tree is the same and
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// our position in the rule node tree is also the same.
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PRBool compare = mRuleNode != aOther->mRuleNode;
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nsChangeHint maxHint = nsChangeHint(NS_STYLE_HINT_FRAMECHANGE |
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nsChangeHint_UpdateCursor);
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#define DO_STRUCT_DIFFERENCE(struct_) \
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PR_BEGIN_MACRO \
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NS_ASSERTION(NS_IsHintSubset(nsStyle##struct_::MaxDifference(), maxHint), \
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"Struct placed in the wrong maxHint section"); \
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const nsStyle##struct_* this##struct_ = \
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static_cast<const nsStyle##struct_*>( \
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PeekStyleData(eStyleStruct_##struct_)); \
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if (this##struct_) { \
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const nsStyle##struct_* other##struct_ = aOther->GetStyle##struct_(); \
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if ((compare || nsStyle##struct_::ForceCompare()) && \
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!NS_IsHintSubset(maxHint, hint) && \
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this##struct_ != other##struct_) { \
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NS_ASSERTION(NS_IsHintSubset( \
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this##struct_->CalcDifference(*other##struct_), \
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nsStyle##struct_::MaxDifference()), \
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"CalcDifference() returned bigger hint than MaxDifference()"); \
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NS_UpdateHint(hint, this##struct_->CalcDifference(*other##struct_)); \
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} \
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} \
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PR_END_MACRO
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// We begin by examining those style structs that are capable of
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// causing the maximal difference, a FRAMECHANGE.
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// FRAMECHANGE Structs: Display, XUL, Content, UserInterface,
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// Visibility, Outline, TableBorder, Table, Text, UIReset, Quotes
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DO_STRUCT_DIFFERENCE(Display);
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DO_STRUCT_DIFFERENCE(XUL);
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DO_STRUCT_DIFFERENCE(Column);
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DO_STRUCT_DIFFERENCE(Content);
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DO_STRUCT_DIFFERENCE(UserInterface);
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DO_STRUCT_DIFFERENCE(Visibility);
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DO_STRUCT_DIFFERENCE(Outline);
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DO_STRUCT_DIFFERENCE(TableBorder);
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DO_STRUCT_DIFFERENCE(Table);
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DO_STRUCT_DIFFERENCE(UIReset);
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DO_STRUCT_DIFFERENCE(Text);
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DO_STRUCT_DIFFERENCE(List);
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// If the quotes implementation is ever going to change we might not need
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// a framechange here and a reflow should be sufficient. See bug 35768.
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DO_STRUCT_DIFFERENCE(Quotes);
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maxHint = nsChangeHint(NS_STYLE_HINT_REFLOW | nsChangeHint_UpdateEffects);
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DO_STRUCT_DIFFERENCE(SVGReset);
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DO_STRUCT_DIFFERENCE(SVG);
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// At this point, we know that the worst kind of damage we could do is
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// a reflow.
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maxHint = NS_STYLE_HINT_REFLOW;
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// The following structs cause (as their maximal difference) a reflow
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// to occur. REFLOW Structs: Font, Margin, Padding, Border, List,
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// Position, Text, TextReset
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DO_STRUCT_DIFFERENCE(Font);
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DO_STRUCT_DIFFERENCE(Margin);
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DO_STRUCT_DIFFERENCE(Padding);
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DO_STRUCT_DIFFERENCE(Border);
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DO_STRUCT_DIFFERENCE(Position);
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DO_STRUCT_DIFFERENCE(TextReset);
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// At this point, we know that the worst kind of damage we could do is
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// a re-render (i.e., a VISUAL change).
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|
maxHint = NS_STYLE_HINT_VISUAL;
|
|
|
|
// The following structs cause (as their maximal difference) a
|
|
// re-render to occur. VISUAL Structs: Color, Background
|
|
DO_STRUCT_DIFFERENCE(Color);
|
|
DO_STRUCT_DIFFERENCE(Background);
|
|
|
|
#undef DO_STRUCT_DIFFERENCE
|
|
|
|
return hint;
|
|
}
|
|
|
|
void
|
|
nsStyleContext::Mark()
|
|
{
|
|
// Mark our rule node.
|
|
mRuleNode->Mark();
|
|
|
|
// Mark our children (i.e., tell them to mark their rule nodes, etc.).
|
|
if (mChild) {
|
|
nsStyleContext* child = mChild;
|
|
do {
|
|
child->Mark();
|
|
child = child->mNextSibling;
|
|
} while (mChild != child);
|
|
}
|
|
|
|
if (mEmptyChild) {
|
|
nsStyleContext* child = mEmptyChild;
|
|
do {
|
|
child->Mark();
|
|
child = child->mNextSibling;
|
|
} while (mEmptyChild != child);
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
void nsStyleContext::List(FILE* out, PRInt32 aIndent)
|
|
{
|
|
// Indent
|
|
PRInt32 ix;
|
|
for (ix = aIndent; --ix >= 0; ) fputs(" ", out);
|
|
fprintf(out, "%p(%d) parent=%p ",
|
|
(void*)this, mRefCnt, (void *)mParent);
|
|
if (mPseudoTag) {
|
|
nsAutoString buffer;
|
|
mPseudoTag->ToString(buffer);
|
|
fputs(NS_LossyConvertUTF16toASCII(buffer).get(), out);
|
|
fputs(" ", out);
|
|
}
|
|
|
|
if (mRuleNode) {
|
|
fputs("{\n", out);
|
|
nsRuleNode* ruleNode = mRuleNode;
|
|
while (ruleNode) {
|
|
nsIStyleRule *styleRule = ruleNode->GetRule();
|
|
if (styleRule) {
|
|
styleRule->List(out, aIndent + 1);
|
|
}
|
|
ruleNode = ruleNode->GetParent();
|
|
}
|
|
for (ix = aIndent; --ix >= 0; ) fputs(" ", out);
|
|
fputs("}\n", out);
|
|
}
|
|
else {
|
|
fputs("{}\n", out);
|
|
}
|
|
|
|
if (nsnull != mChild) {
|
|
nsStyleContext* child = mChild;
|
|
do {
|
|
child->List(out, aIndent + 1);
|
|
child = child->mNextSibling;
|
|
} while (mChild != child);
|
|
}
|
|
if (nsnull != mEmptyChild) {
|
|
nsStyleContext* child = mEmptyChild;
|
|
do {
|
|
child->List(out, aIndent + 1);
|
|
child = child->mNextSibling;
|
|
} while (mEmptyChild != child);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
// Overloaded new operator. Initializes the memory to 0 and relies on an arena
|
|
// (which comes from the presShell) to perform the allocation.
|
|
void*
|
|
nsStyleContext::operator new(size_t sz, nsPresContext* aPresContext) CPP_THROW_NEW
|
|
{
|
|
// Check the recycle list first.
|
|
return aPresContext->AllocateFromShell(sz);
|
|
}
|
|
|
|
// Overridden to prevent the global delete from being called, since the memory
|
|
// came out of an nsIArena instead of the global delete operator's heap.
|
|
void
|
|
nsStyleContext::Destroy()
|
|
{
|
|
// Get the pres context from our rule node.
|
|
nsCOMPtr<nsPresContext> presContext = mRuleNode->GetPresContext();
|
|
|
|
// Call our destructor.
|
|
this->~nsStyleContext();
|
|
|
|
// Don't let the memory be freed, since it will be recycled
|
|
// instead. Don't call the global operator delete.
|
|
presContext->FreeToShell(sizeof(nsStyleContext), this);
|
|
}
|
|
|
|
already_AddRefed<nsStyleContext>
|
|
NS_NewStyleContext(nsStyleContext* aParentContext,
|
|
nsIAtom* aPseudoTag,
|
|
nsCSSPseudoElements::Type aPseudoType,
|
|
nsRuleNode* aRuleNode,
|
|
nsPresContext* aPresContext)
|
|
{
|
|
nsStyleContext* context =
|
|
new (aPresContext) nsStyleContext(aParentContext, aPseudoTag, aPseudoType,
|
|
aRuleNode, aPresContext);
|
|
if (context)
|
|
context->AddRef();
|
|
return context;
|
|
}
|
|
|