gecko/layout/style/nsHTMLStyleSheet.cpp

596 lines
16 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK *****
*
* 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.
*/
/*
* style sheet and style rule processor representing data from presentational
* HTML attributes
*/
#include "nsHTMLStyleSheet.h"
#include "nsINameSpaceManager.h"
#include "nsIAtom.h"
#include "nsIURL.h"
#include "nsMappedAttributes.h"
#include "nsILink.h"
#include "nsIFrame.h"
#include "nsStyleContext.h"
#include "nsGkAtoms.h"
#include "nsPresContext.h"
#include "nsIEventStateManager.h"
#include "nsIDocument.h"
#include "nsIPresShell.h"
#include "nsStyleConsts.h"
#include "nsIHTMLDocument.h"
#include "nsIDOMHTMLElement.h"
#include "nsCSSAnonBoxes.h"
#include "nsRuleWalker.h"
#include "nsRuleData.h"
#include "nsContentErrors.h"
#include "nsRuleProcessorData.h"
#include "mozilla/dom/Element.h"
#include "nsCSSFrameConstructor.h"
using namespace mozilla::dom;
NS_IMPL_ISUPPORTS1(nsHTMLStyleSheet::HTMLColorRule, nsIStyleRule)
/* virtual */ void
nsHTMLStyleSheet::HTMLColorRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
if (aRuleData->mSIDs & NS_STYLE_INHERIT_BIT(Color)) {
nsCSSValue* color = aRuleData->ValueForColor();
if (color->GetUnit() == eCSSUnit_Null &&
aRuleData->mPresContext->UseDocumentColors())
color->SetColorValue(mColor);
}
}
#ifdef DEBUG
/* virtual */ void
nsHTMLStyleSheet::HTMLColorRule::List(FILE* out, PRInt32 aIndent) const
{
}
#endif
NS_IMPL_ISUPPORTS1(nsHTMLStyleSheet::GenericTableRule, nsIStyleRule)
/* virtual */ void
nsHTMLStyleSheet::GenericTableRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
// Nothing to do.
}
#ifdef DEBUG
/* virtual */ void
nsHTMLStyleSheet::GenericTableRule::List(FILE* out, PRInt32 aIndent) const
{
}
#endif
/* virtual */ void
nsHTMLStyleSheet::TableTHRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
if (aRuleData->mSIDs & NS_STYLE_INHERIT_BIT(Text)) {
nsCSSValue* textAlign = aRuleData->ValueForTextAlign();
if (textAlign->GetUnit() == eCSSUnit_Null) {
textAlign->SetIntValue(NS_STYLE_TEXT_ALIGN_MOZ_CENTER_OR_INHERIT,
eCSSUnit_Enumerated);
}
}
}
// -----------------------------------------------------------
struct MappedAttrTableEntry : public PLDHashEntryHdr {
nsMappedAttributes *mAttributes;
};
static PLDHashNumber
MappedAttrTable_HashKey(PLDHashTable *table, const void *key)
{
nsMappedAttributes *attributes =
static_cast<nsMappedAttributes*>(const_cast<void*>(key));
return attributes->HashValue();
}
static void
MappedAttrTable_ClearEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
{
MappedAttrTableEntry *entry = static_cast<MappedAttrTableEntry*>(hdr);
entry->mAttributes->DropStyleSheetReference();
memset(entry, 0, sizeof(MappedAttrTableEntry));
}
static PRBool
MappedAttrTable_MatchEntry(PLDHashTable *table, const PLDHashEntryHdr *hdr,
const void *key)
{
nsMappedAttributes *attributes =
static_cast<nsMappedAttributes*>(const_cast<void*>(key));
const MappedAttrTableEntry *entry =
static_cast<const MappedAttrTableEntry*>(hdr);
return attributes->Equals(entry->mAttributes);
}
static PLDHashTableOps MappedAttrTable_Ops = {
PL_DHashAllocTable,
PL_DHashFreeTable,
MappedAttrTable_HashKey,
MappedAttrTable_MatchEntry,
PL_DHashMoveEntryStub,
MappedAttrTable_ClearEntry,
PL_DHashFinalizeStub,
NULL
};
// -----------------------------------------------------------
nsHTMLStyleSheet::nsHTMLStyleSheet(void)
: mDocument(nsnull)
{
mMappedAttrTable.ops = nsnull;
}
nsresult
nsHTMLStyleSheet::Init()
{
mTableTHRule = new TableTHRule();
if (!mTableTHRule)
return NS_ERROR_OUT_OF_MEMORY;
return NS_OK;
}
nsHTMLStyleSheet::~nsHTMLStyleSheet()
{
if (mMappedAttrTable.ops)
PL_DHashTableFinish(&mMappedAttrTable);
}
NS_IMPL_ISUPPORTS2(nsHTMLStyleSheet, nsIStyleSheet, nsIStyleRuleProcessor)
static nsresult GetBodyColor(nsPresContext* aPresContext, nscolor* aColor)
{
nsIPresShell *shell = aPresContext->PresShell();
nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(shell->GetDocument());
if (!htmlDoc)
return NS_ERROR_FAILURE;
nsIContent* bodyContent = htmlDoc->GetBodyContentExternal();
if (!bodyContent)
return NS_ERROR_FAILURE;
nsIFrame *bodyFrame = bodyContent->GetPrimaryFrame();
if (!bodyFrame)
return NS_ERROR_FAILURE;
*aColor = bodyFrame->GetStyleColor()->mColor;
return NS_OK;
}
/* virtual */ void
nsHTMLStyleSheet::RulesMatching(ElementRuleProcessorData* aData)
{
nsRuleWalker *ruleWalker = aData->mRuleWalker;
if (aData->mIsHTMLContent) {
nsIAtom* tag = aData->mContentTag;
// if we have anchor colors, check if this is an anchor with an href
if (tag == nsGkAtoms::a) {
if (mLinkRule || mVisitedRule || mActiveRule) {
nsEventStates state = aData->GetContentStateForVisitedHandling(
ruleWalker->VisitedHandling(),
// If the node being matched is a link,
// it's the relevant link.
aData->IsLink());
if (mLinkRule && state.HasState(NS_EVENT_STATE_UNVISITED)) {
ruleWalker->Forward(mLinkRule);
ruleWalker->SetHaveRelevantLink();
}
else if (mVisitedRule && state.HasState(NS_EVENT_STATE_VISITED)) {
ruleWalker->Forward(mVisitedRule);
ruleWalker->SetHaveRelevantLink();
}
// No need to add to the active rule if it's not a link
if (mActiveRule && aData->IsLink() &&
state.HasState(NS_EVENT_STATE_ACTIVE)) {
ruleWalker->Forward(mActiveRule);
}
} // end link/visited/active rules
} // end A tag
// add the rule to handle text-align for a <th>
else if (tag == nsGkAtoms::th) {
ruleWalker->Forward(mTableTHRule);
}
else if (tag == nsGkAtoms::table) {
if (aData->mCompatMode == eCompatibility_NavQuirks) {
nscolor bodyColor;
nsresult rv =
GetBodyColor(ruleWalker->CurrentNode()->GetPresContext(),
&bodyColor);
if (NS_SUCCEEDED(rv) &&
(!mDocumentColorRule || bodyColor != mDocumentColorRule->mColor)) {
mDocumentColorRule = new HTMLColorRule();
if (mDocumentColorRule) {
mDocumentColorRule->mColor = bodyColor;
}
}
if (mDocumentColorRule)
ruleWalker->Forward(mDocumentColorRule);
}
}
} // end html element
// just get the style rules from the content
aData->mElement->WalkContentStyleRules(ruleWalker);
}
// Test if style is dependent on content state
/* virtual */ nsRestyleHint
nsHTMLStyleSheet::HasStateDependentStyle(StateRuleProcessorData* aData)
{
if (aData->mIsHTMLContent &&
aData->mContentTag == nsGkAtoms::a &&
aData->IsLink() &&
((mActiveRule && aData->mStateMask.HasState(NS_EVENT_STATE_ACTIVE)) ||
(mLinkRule && aData->mStateMask.HasState(NS_EVENT_STATE_VISITED)) ||
(mVisitedRule && aData->mStateMask.HasState(NS_EVENT_STATE_VISITED)))) {
return eRestyle_Self;
}
return nsRestyleHint(0);
}
/* virtual */ PRBool
nsHTMLStyleSheet::HasDocumentStateDependentStyle(StateRuleProcessorData* aData)
{
return PR_FALSE;
}
/* virtual */ nsRestyleHint
nsHTMLStyleSheet::HasAttributeDependentStyle(AttributeRuleProcessorData* aData)
{
// Do nothing on before-change checks
if (!aData->mAttrHasChanged) {
return nsRestyleHint(0);
}
// Note: no need to worry about whether some states changed with this
// attribute here, because we handle that under HasStateDependentStyle() as
// needed.
// Result is true for |href| changes on HTML links if we have link rules.
Element *element = aData->mElement;
if (aData->mAttribute == nsGkAtoms::href &&
(mLinkRule || mVisitedRule || mActiveRule) &&
element->IsHTML() &&
aData->mContentTag == nsGkAtoms::a) {
return eRestyle_Self;
}
// Don't worry about the mDocumentColorRule since it only applies
// to descendants of body, when we're already reresolving.
// Handle the content style rules.
if (element->IsAttributeMapped(aData->mAttribute)) {
// cellpadding on tables is special and requires reresolving all
// the cells in the table
if (aData->mAttribute == nsGkAtoms::cellpadding &&
element->IsHTML() &&
aData->mContentTag == nsGkAtoms::table) {
return eRestyle_Subtree;
}
return eRestyle_Self;
}
return nsRestyleHint(0);
}
/* virtual */ PRBool
nsHTMLStyleSheet::MediumFeaturesChanged(nsPresContext* aPresContext)
{
return PR_FALSE;
}
/* virtual */ void
nsHTMLStyleSheet::RulesMatching(PseudoElementRuleProcessorData* aData)
{
}
/* virtual */ void
nsHTMLStyleSheet::RulesMatching(AnonBoxRuleProcessorData* aData)
{
}
#ifdef MOZ_XUL
/* virtual */ void
nsHTMLStyleSheet::RulesMatching(XULTreeRuleProcessorData* aData)
{
}
#endif
// nsIStyleSheet api
/* virtual */ nsIURI*
nsHTMLStyleSheet::GetSheetURI() const
{
return mURL;
}
/* virtual */ nsIURI*
nsHTMLStyleSheet::GetBaseURI() const
{
return mURL;
}
/* virtual */ void
nsHTMLStyleSheet::GetTitle(nsString& aTitle) const
{
aTitle.Truncate();
}
/* virtual */ void
nsHTMLStyleSheet::GetType(nsString& aType) const
{
aType.AssignLiteral("text/html");
}
/* virtual */ PRBool
nsHTMLStyleSheet::HasRules() const
{
return PR_TRUE; // We have rules at all reasonable times
}
/* virtual */ PRBool
nsHTMLStyleSheet::IsApplicable() const
{
return PR_TRUE;
}
/* virtual */ void
nsHTMLStyleSheet::SetEnabled(PRBool aEnabled)
{ // these can't be disabled
}
/* virtual */ PRBool
nsHTMLStyleSheet::IsComplete() const
{
return PR_TRUE;
}
/* virtual */ void
nsHTMLStyleSheet::SetComplete()
{
}
/* virtual */ nsIStyleSheet*
nsHTMLStyleSheet::GetParentSheet() const
{
return nsnull;
}
/* virtual */ nsIDocument*
nsHTMLStyleSheet::GetOwningDocument() const
{
return mDocument;
}
/* virtual */ void
nsHTMLStyleSheet::SetOwningDocument(nsIDocument* aDocument)
{
mDocument = aDocument; // not refcounted
}
nsresult
nsHTMLStyleSheet::Init(nsIURI* aURL, nsIDocument* aDocument)
{
NS_PRECONDITION(aURL && aDocument, "null ptr");
if (! aURL || ! aDocument)
return NS_ERROR_NULL_POINTER;
if (mURL || mDocument)
return NS_ERROR_ALREADY_INITIALIZED;
mDocument = aDocument; // not refcounted!
mURL = aURL;
return NS_OK;
}
void
nsHTMLStyleSheet::Reset(nsIURI* aURL)
{
mURL = aURL;
mLinkRule = nsnull;
mVisitedRule = nsnull;
mActiveRule = nsnull;
mDocumentColorRule = nsnull;
if (mMappedAttrTable.ops) {
PL_DHashTableFinish(&mMappedAttrTable);
mMappedAttrTable.ops = nsnull;
}
}
nsresult
nsHTMLStyleSheet::ImplLinkColorSetter(nsRefPtr<HTMLColorRule>& aRule, nscolor aColor)
{
if (aRule && aRule->mColor == aColor) {
return NS_OK;
}
aRule = new HTMLColorRule();
if (!aRule)
return NS_ERROR_OUT_OF_MEMORY;
aRule->mColor = aColor;
// Now make sure we restyle any links that might need it. This
// shouldn't happen often, so just rebuilding everything is ok.
if (mDocument && mDocument->GetShell()) {
Element* root = mDocument->GetRootElement();
if (root) {
mDocument->GetShell()->FrameConstructor()->
PostRestyleEvent(root, eRestyle_Subtree, NS_STYLE_HINT_NONE);
}
}
return NS_OK;
}
nsresult
nsHTMLStyleSheet::SetLinkColor(nscolor aColor)
{
return ImplLinkColorSetter(mLinkRule, aColor);
}
nsresult
nsHTMLStyleSheet::SetActiveLinkColor(nscolor aColor)
{
return ImplLinkColorSetter(mActiveRule, aColor);
}
nsresult
nsHTMLStyleSheet::SetVisitedLinkColor(nscolor aColor)
{
return ImplLinkColorSetter(mVisitedRule, aColor);
}
already_AddRefed<nsMappedAttributes>
nsHTMLStyleSheet::UniqueMappedAttributes(nsMappedAttributes* aMapped)
{
if (!mMappedAttrTable.ops) {
PRBool res = PL_DHashTableInit(&mMappedAttrTable, &MappedAttrTable_Ops,
nsnull, sizeof(MappedAttrTableEntry), 16);
if (!res) {
mMappedAttrTable.ops = nsnull;
return nsnull;
}
}
MappedAttrTableEntry *entry = static_cast<MappedAttrTableEntry*>
(PL_DHashTableOperate(&mMappedAttrTable, aMapped, PL_DHASH_ADD));
if (!entry)
return nsnull;
if (!entry->mAttributes) {
// We added a new entry to the hashtable, so we have a new unique set.
entry->mAttributes = aMapped;
}
NS_ADDREF(entry->mAttributes); // for caller
return entry->mAttributes;
}
void
nsHTMLStyleSheet::DropMappedAttributes(nsMappedAttributes* aMapped)
{
NS_ENSURE_TRUE(aMapped, /**/);
NS_ASSERTION(mMappedAttrTable.ops, "table uninitialized");
#ifdef DEBUG
PRUint32 entryCount = mMappedAttrTable.entryCount - 1;
#endif
PL_DHashTableOperate(&mMappedAttrTable, aMapped, PL_DHASH_REMOVE);
NS_ASSERTION(entryCount == mMappedAttrTable.entryCount, "not removed");
}
#ifdef DEBUG
/* virtual */ void
nsHTMLStyleSheet::List(FILE* out, PRInt32 aIndent) const
{
// Indent
for (PRInt32 index = aIndent; --index >= 0; ) fputs(" ", out);
fputs("HTML Style Sheet: ", out);
nsCAutoString urlSpec;
mURL->GetSpec(urlSpec);
if (!urlSpec.IsEmpty()) {
fputs(urlSpec.get(), out);
}
fputs("\n", out);
}
#endif
// XXX For convenience and backwards compatibility
nsresult
NS_NewHTMLStyleSheet(nsHTMLStyleSheet** aInstancePtrResult, nsIURI* aURL,
nsIDocument* aDocument)
{
nsresult rv;
nsHTMLStyleSheet* sheet;
if (NS_FAILED(rv = NS_NewHTMLStyleSheet(&sheet)))
return rv;
if (NS_FAILED(rv = sheet->Init(aURL, aDocument))) {
NS_RELEASE(sheet);
return rv;
}
*aInstancePtrResult = sheet;
return NS_OK;
}
nsresult
NS_NewHTMLStyleSheet(nsHTMLStyleSheet** aInstancePtrResult)
{
NS_ASSERTION(aInstancePtrResult, "null out param");
nsHTMLStyleSheet *it = new nsHTMLStyleSheet();
if (!it) {
*aInstancePtrResult = nsnull;
return NS_ERROR_OUT_OF_MEMORY;
}
NS_ADDREF(it);
nsresult rv = it->Init();
if (NS_FAILED(rv))
NS_RELEASE(it);
*aInstancePtrResult = it; // NS_ADDREF above, or set to null by NS_RELEASE
return rv;
}