gecko-dev/layout/style/nsInspectorCSSUtils.cpp

/* -*- 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@fas.harvard.edu> (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
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#include "nsInspectorCSSUtils.h"
#include "nsRuleNode.h"
#include "nsString.h"
#include "nsLayoutAtoms.h"

nsInspectorCSSUtils::nsInspectorCSSUtils()
{
    NS_INIT_ISUPPORTS();
    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)
{
    return aNode->GetRule(aRule);
}

NS_IMETHODIMP
nsInspectorCSSUtils::IsRuleNodeRoot(nsRuleNode *aNode, PRBool *aIsRoot)
{
    *aIsRoot = aNode->IsRoot();
    return NS_OK;
}

NS_IMETHODIMP
nsInspectorCSSUtils::AdjustRectForMargins(nsIFrame* aFrame, nsRect& aRect)
{
  const nsStyleMargin* margins;
  ::GetStyleData(aFrame, &margins);
  
  // adjust coordinates for margins
  nsStyleCoord coord;
  if (margins->mMargin.GetTopUnit() == eStyleUnit_Coord) {
    margins->mMargin.GetTop(coord);
    aRect.y -= coord.GetCoordValue();
    aRect.height += coord.GetCoordValue();
  }
  if (margins->mMargin.GetLeftUnit() == eStyleUnit_Coord) {
    margins->mMargin.GetLeft(coord);
    aRect.x -= coord.GetCoordValue();
    aRect.width += coord.GetCoordValue();
  }
  if (margins->mMargin.GetRightUnit() == eStyleUnit_Coord) {
    margins->mMargin.GetRight(coord);
    aRect.width += coord.GetCoordValue();
  }
  if (margins->mMargin.GetBottomUnit() == eStyleUnit_Coord) {
    margins->mMargin.GetBottom(coord);
    aRect.height += coord.GetCoordValue();
  }

  return NS_OK;
}

NS_IMETHODIMP
nsInspectorCSSUtils::GetStyleContextForFrame(nsIFrame* aFrame,
                                             nsIStyleContext** aStyleContext)
{
    NS_PRECONDITION(aFrame, "We'd better have a frame!");

    nsCOMPtr<nsIStyleContext> styleContext;
    aFrame->GetStyleContext(getter_AddRefs(styleContext));
    if (!styleContext) {
        // Caller returns rv on through, and this does not seem
        // exception-worthy.
        *aStyleContext = nsnull;
        return NS_OK;
    }

    /* 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....
     */
    nsCOMPtr<nsIAtom> frameType;
    aFrame->GetFrameType(getter_AddRefs(frameType));
    if (frameType == nsLayoutAtoms::tableOuterFrame) {
        *aStyleContext = styleContext->GetParent();
    } else {
        *aStyleContext = styleContext;
        NS_ADDREF(*aStyleContext);
    }
    return NS_OK;
}