pjs/layout/style/nsInspectorCSSUtils.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
// vim:cindent:ts=8:et:sw=4:
/* ***** 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) 2002
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* L. David Baron <dbaron@dbaron.org> (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either 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
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* decision by deleting the provisions above and replace them with the notice
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* 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 ***** */
/* XPCOM interface to provide some internal information to DOM inspector */
#include "nsInspectorCSSUtils.h"
#include "nsIStyleRule.h"
#include "nsRuleNode.h"
#include "nsString.h"
#include "nsGkAtoms.h"
#include "nsIDocument.h"
#include "nsIPresShell.h"
#include "nsAutoPtr.h"
#include "nsIFrame.h"
#include "nsStyleSet.h"
#include "nsXBLBinding.h"
#include "nsXBLPrototypeBinding.h"
#include "nsIDOMElement.h"
#include "nsIMutableArray.h"
#include "nsBindingManager.h"
nsInspectorCSSUtils::nsInspectorCSSUtils()
{
nsCSSProps::AddRefTable();
}
nsInspectorCSSUtils::~nsInspectorCSSUtils()
{
nsCSSProps::ReleaseTable();
}
NS_IMPL_ISUPPORTS1(nsInspectorCSSUtils, nsIInspectorCSSUtils)
NS_IMETHODIMP
nsInspectorCSSUtils::LookupCSSProperty(const nsAString& aName, nsCSSProperty *aProp)
{
*aProp = nsCSSProps::LookupProperty(aName);
return NS_OK;
}
NS_IMETHODIMP
nsInspectorCSSUtils::GetRuleNodeParent(nsRuleNode *aNode, nsRuleNode **aParent)
{
*aParent = aNode->GetParent();
return NS_OK;
}
NS_IMETHODIMP
nsInspectorCSSUtils::GetRuleNodeRule(nsRuleNode *aNode, nsIStyleRule **aRule)
{
*aRule = aNode->GetRule();
NS_IF_ADDREF(*aRule);
return NS_OK;
}
NS_IMETHODIMP
nsInspectorCSSUtils::IsRuleNodeRoot(nsRuleNode *aNode, PRBool *aIsRoot)
{
*aIsRoot = aNode->IsRoot();
return NS_OK;
}
/* static */
nsStyleContext*
nsInspectorCSSUtils::GetStyleContextForFrame(nsIFrame* aFrame)
{
nsStyleContext* styleContext = aFrame->GetStyleContext();
if (!styleContext)
return nsnull;
/* For tables the primary frame is the "outer frame" but the style
* rules are applied to the "inner frame". Luckily, the "outer
* frame" actually inherits style from the "inner frame" so we can
* just move one level up in the style context hierarchy....
*/
if (aFrame->GetType() == nsGkAtoms::tableOuterFrame)
return styleContext->GetParent();
return styleContext;
}
/* static */
already_AddRefed<nsStyleContext>
nsInspectorCSSUtils::GetStyleContextForContent(nsIContent* aContent,
nsIAtom* aPseudo,
nsIPresShell* aPresShell)
{
if (!aPseudo) {
aPresShell->FlushPendingNotifications(Flush_StyleReresolves);
nsIFrame* frame = aPresShell->GetPrimaryFrameFor(aContent);
if (frame) {
nsStyleContext* result = GetStyleContextForFrame(frame);
// this function returns an addrefed style context
if (result)
result->AddRef();
return result;
}
}
// No frame has been created or we have a pseudo, so resolve the
// style ourselves
nsRefPtr<nsStyleContext> parentContext;
nsIContent* parent = aPseudo ? aContent : aContent->GetParent();
if (parent)
parentContext = GetStyleContextForContent(parent, nsnull, aPresShell);
nsPresContext *presContext = aPresShell->GetPresContext();
if (!presContext)
return nsnull;
nsStyleSet *styleSet = aPresShell->StyleSet();
if (!aContent->IsNodeOfType(nsINode::eELEMENT)) {
NS_ASSERTION(!aPseudo, "Shouldn't have a pseudo for a non-element!");
return styleSet->ResolveStyleForNonElement(parentContext);
}
if (aPseudo) {
return styleSet->ResolvePseudoStyleFor(aContent, aPseudo, parentContext);
}
return styleSet->ResolveStyleFor(aContent, parentContext);
}
NS_IMETHODIMP
nsInspectorCSSUtils::GetRuleNodeForContent(nsIContent* aContent,
nsRuleNode** aRuleNode)
{
*aRuleNode = nsnull;
nsIDocument* doc = aContent->GetDocument();
NS_ENSURE_TRUE(doc, NS_ERROR_UNEXPECTED);
nsIPresShell *presShell = doc->GetPrimaryShell();
NS_ENSURE_TRUE(presShell, NS_ERROR_UNEXPECTED);
nsRefPtr<nsStyleContext> sContext =
GetStyleContextForContent(aContent, nsnull, presShell);
*aRuleNode = sContext->GetRuleNode();
return NS_OK;
}
NS_IMETHODIMP
nsInspectorCSSUtils::GetBindingURLs(nsIDOMElement *aElement,
nsIArray **aResult)
{
*aResult = nsnull;
nsCOMPtr<nsIMutableArray> urls = do_CreateInstance(NS_ARRAY_CONTRACTID);
if (!urls)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
NS_ASSERTION(content, "elements must implement nsIContent");
nsIDocument *ownerDoc = content->GetOwnerDoc();
if (ownerDoc) {
nsXBLBinding *binding =
ownerDoc->BindingManager()->GetBinding(content);
while (binding) {
urls->AppendElement(binding->PrototypeBinding()->BindingURI(),
PR_FALSE);
binding = binding->GetBaseBinding();
}
}
NS_ADDREF(*aResult = urls);
return NS_OK;
}