gecko/layout/inspector/src/inDOMUtils.cpp

/* ***** 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) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Joe Hewitt <hewitt@netscape.com> (original author)
 *   Christopher A. Aillon <christopher@aillon.com>
 *
 * 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
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 * the provisions above, a recipient may use your version of this file under
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#include "inDOMUtils.h"
#include "inLayoutUtils.h"

#include "nsIServiceManager.h"
#include "nsString.h"
#include "nsIDOMElement.h"
#include "nsIDocument.h"
#include "nsIPresShell.h"
#include "nsIDOMDocument.h"
#include "nsIDOMCharacterData.h"
#include "nsRuleNode.h"
#include "nsIStyleRule.h"
#include "mozilla/css/StyleRule.h"
#include "nsICSSStyleRuleDOMWrapper.h"
#include "nsIDOMWindowInternal.h"
#include "nsXBLBinding.h"
#include "nsXBLPrototypeBinding.h"
#include "nsIMutableArray.h"
#include "nsBindingManager.h"
#include "nsComputedDOMStyle.h"
#include "nsEventStateManager.h"
#include "nsIAtom.h"

///////////////////////////////////////////////////////////////////////////////

inDOMUtils::inDOMUtils()
{
}

inDOMUtils::~inDOMUtils()
{
}

NS_IMPL_ISUPPORTS1(inDOMUtils, inIDOMUtils)

///////////////////////////////////////////////////////////////////////////////
// inIDOMUtils

NS_IMETHODIMP
inDOMUtils::IsIgnorableWhitespace(nsIDOMCharacterData *aDataNode,
                                  PRBool *aReturn)
{
  NS_PRECONDITION(aReturn, "Must have an out parameter");

  NS_ENSURE_ARG_POINTER(aDataNode);

  *aReturn = PR_FALSE;

  nsCOMPtr<nsIContent> content = do_QueryInterface(aDataNode);
  NS_ASSERTION(content, "Does not implement nsIContent!");

  if (!content->TextIsOnlyWhitespace()) {
    return NS_OK;
  }

  // Okay.  We have only white space.  Let's check the white-space
  // property now and make sure that this isn't preformatted text...

  nsCOMPtr<nsIDOMWindowInternal> win = inLayoutUtils::GetWindowFor(aDataNode);
  if (!win) {
    // Hmm.  Things are screwy if we have no window...
    NS_ERROR("No window!");
    return NS_OK;
  }

  nsIFrame* frame = content->GetPrimaryFrame();
  if (frame) {
    const nsStyleText* text = frame->GetStyleText();
    *aReturn = !text->WhiteSpaceIsSignificant();
  }
  else {
    // empty inter-tag text node without frame, e.g., in between <table>\n<tr>
    *aReturn = PR_TRUE;
  }

  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::GetParentForNode(nsIDOMNode* aNode,
                             PRBool aShowingAnonymousContent,
                             nsIDOMNode** aParent)
{
  NS_ENSURE_ARG_POINTER(aNode);

  // First do the special cases -- document nodes and anonymous content
  nsCOMPtr<nsIDOMDocument> doc(do_QueryInterface(aNode));
  nsCOMPtr<nsIDOMNode> parent;

  if (doc) {
    parent = inLayoutUtils::GetContainerFor(doc);
  } else if (aShowingAnonymousContent) {
    nsCOMPtr<nsIContent> content = do_QueryInterface(aNode);
    if (content) {
      nsIContent* bparent = nsnull;
      nsRefPtr<nsBindingManager> bindingManager = inLayoutUtils::GetBindingManagerFor(aNode);
      if (bindingManager) {
        bparent = bindingManager->GetInsertionParent(content);
      }
    
      parent = do_QueryInterface(bparent);
    }
  }
  
  if (!parent) {
    // Ok, just get the normal DOM parent node
    aNode->GetParentNode(getter_AddRefs(parent));
  }

  NS_IF_ADDREF(*aParent = parent);
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::GetCSSStyleRules(nsIDOMElement *aElement,
                             const nsAString& aPseudo,
                             nsISupportsArray **_retval)
{
  NS_ENSURE_ARG_POINTER(aElement);

  *_retval = nsnull;

  nsCOMPtr<nsIAtom> pseudoElt;
  if (!aPseudo.IsEmpty()) {
    pseudoElt = do_GetAtom(aPseudo);
  }

  nsRuleNode* ruleNode = nsnull;
  nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
  nsRefPtr<nsStyleContext> styleContext;
  GetRuleNodeForContent(content, pseudoElt, getter_AddRefs(styleContext), &ruleNode);
  if (!ruleNode) {
    // This can fail for content nodes that are not in the document or
    // if the document they're in doesn't have a presshell.  Bail out.
    return NS_OK;
  }

  nsCOMPtr<nsISupportsArray> rules;
  NS_NewISupportsArray(getter_AddRefs(rules));
  if (!rules) return NS_ERROR_OUT_OF_MEMORY;

  nsRefPtr<mozilla::css::StyleRule> cssRule;
  for ( ; !ruleNode->IsRoot(); ruleNode = ruleNode->GetParent()) {
    cssRule = do_QueryObject(ruleNode->GetRule());
    if (cssRule) {
      nsCOMPtr<nsIDOMCSSRule> domRule = cssRule->GetDOMRule();
      if (domRule)
        rules->InsertElementAt(domRule, 0);
    }
  }

  *_retval = rules;
  NS_ADDREF(*_retval);

  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::GetRuleLine(nsIDOMCSSStyleRule *aRule, PRUint32 *_retval)
{
  *_retval = 0;

  NS_ENSURE_ARG_POINTER(aRule);

  nsCOMPtr<nsICSSStyleRuleDOMWrapper> rule = do_QueryInterface(aRule);
  nsRefPtr<mozilla::css::StyleRule> cssrule;
  nsresult rv = rule->GetCSSStyleRule(getter_AddRefs(cssrule));
  NS_ENSURE_SUCCESS(rv, rv);
  NS_ENSURE_TRUE(cssrule != nsnull, NS_ERROR_FAILURE);
  *_retval = cssrule->GetLineNumber();
  return NS_OK;
}

NS_IMETHODIMP 
inDOMUtils::GetBindingURLs(nsIDOMElement *aElement, nsIArray **_retval)
{
  NS_ENSURE_ARG_POINTER(aElement);

  *_retval = 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(*_retval = urls);
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::SetContentState(nsIDOMElement *aElement, nsEventStates::InternalType aState)
{
  NS_ENSURE_ARG_POINTER(aElement);
  
  nsRefPtr<nsEventStateManager> esm = inLayoutUtils::GetEventStateManagerFor(aElement);
  if (esm) {
    nsCOMPtr<nsIContent> content;
    content = do_QueryInterface(aElement);
  
    return esm->SetContentState(content, nsEventStates(aState));
  }
  
  return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
inDOMUtils::GetContentState(nsIDOMElement *aElement, nsEventStates::InternalType* aState)
{
  *aState = 0;

  NS_ENSURE_ARG_POINTER(aElement);

  nsRefPtr<nsEventStateManager> esm = inLayoutUtils::GetEventStateManagerFor(aElement);
  if (esm) {
    nsCOMPtr<nsIContent> content;
    content = do_QueryInterface(aElement);
    // NOTE: if this method is removed,
    // please remove GetInternalValue from nsEventStates
    *aState = esm->GetContentState(content).GetInternalValue();
    return NS_OK;
  }

  return NS_ERROR_FAILURE;
}

/* static */ nsresult
inDOMUtils::GetRuleNodeForContent(nsIContent* aContent,
                                  nsIAtom* aPseudo,
                                  nsStyleContext** aStyleContext,
                                  nsRuleNode** aRuleNode)
{
  *aRuleNode = nsnull;
  *aStyleContext = nsnull;

  if (!aContent->IsElement()) {
    return NS_ERROR_UNEXPECTED;
  }

  nsIDocument* doc = aContent->GetDocument();
  NS_ENSURE_TRUE(doc, NS_ERROR_UNEXPECTED);

  nsIPresShell *presShell = doc->GetShell();
  NS_ENSURE_TRUE(presShell, NS_ERROR_UNEXPECTED);

  nsPresContext *presContext = presShell->GetPresContext();
  NS_ENSURE_TRUE(presContext, NS_ERROR_UNEXPECTED);

  PRBool safe = presContext->EnsureSafeToHandOutCSSRules();
  NS_ENSURE_TRUE(safe, NS_ERROR_OUT_OF_MEMORY);

  nsRefPtr<nsStyleContext> sContext =
    nsComputedDOMStyle::GetStyleContextForElement(aContent->AsElement(), aPseudo, presShell);
  if (sContext) {
    *aRuleNode = sContext->GetRuleNode();
    sContext.forget(aStyleContext);
  }
  return NS_OK;
}