third_party/WebKit/Source/core/css/CSSViewportRule.cpp

   1 /*
   2  * Copyright (C) 2012 Intel Corporation. All rights reserved.
   3  * Copyright (C) 2012 Apple Inc. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above
  10  *    copyright notice, this list of conditions and the following
  11  *    disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above
  13  *    copyright notice, this list of conditions and the following
  14  *    disclaimer in the documentation and/or other materials
  15  *    provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  20  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
  21  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  22  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  24  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  26  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  27  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #include "config.h"
  32 #include "core/css/CSSViewportRule.h"
  33
  34 #include "core/css/PropertySetCSSStyleDeclaration.h"
  35 #include "core/css/StylePropertySet.h"
  36 #include "core/css/StyleRule.h"
  37 #include "wtf/text/StringBuilder.h"
  38
  39 namespace blink {
  40
  41 CSSViewportRule::CSSViewportRule(StyleRuleViewport* viewportRule, CSSStyleSheet* sheet)
  42     : CSSRule(sheet)
  43     , m_viewportRule(viewportRule)
  44 {
  45 }
  46
  47 CSSViewportRule::~CSSViewportRule()
  48 {
  49 #if !ENABLE(OILPAN)
  50     if (m_propertiesCSSOMWrapper)
  51         m_propertiesCSSOMWrapper->clearParentRule();
  52 #endif
  53 }
  54
  55 CSSStyleDeclaration* CSSViewportRule::style() const
  56 {
  57     if (!m_propertiesCSSOMWrapper)
  58         m_propertiesCSSOMWrapper = StyleRuleCSSStyleDeclaration::create(m_viewportRule->mutableProperties(), const_cast<CSSViewportRule*>(this));
  59
  60     return m_propertiesCSSOMWrapper.get();
  61 }
  62
  63 String CSSViewportRule::cssText() const
  64 {
  65     StringBuilder result;
  66     result.appendLiteral("@viewport { ");
  67
  68     String decls = m_viewportRule->properties().asText();
  69     result.append(decls);
  70     if (!decls.isEmpty())
  71         result.append(' ');
  72
  73     result.append('}');
  74
  75     return result.toString();
  76 }
  77
  78 void CSSViewportRule::reattach(StyleRuleBase* rule)
  79 {
  80     ASSERT(rule);
  81     m_viewportRule = toStyleRuleViewport(rule);
  82     if (m_propertiesCSSOMWrapper)
  83         m_propertiesCSSOMWrapper->reattach(m_viewportRule->mutableProperties());
  84 }
  85
  86 DEFINE_TRACE(CSSViewportRule)
  87 {
  88     visitor->trace(m_viewportRule);
  89     visitor->trace(m_propertiesCSSOMWrapper);
  90     CSSRule::trace(visitor);
  91 }
  92
  93 } // namespace blink