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      1 /*
      2  * Copyright (C) 2005, 2008 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "core/editing/RemoveCSSPropertyCommand.h"
     28 
     29 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
     30 #include "core/css/CSSStyleDeclaration.h"
     31 #include "core/css/StylePropertySet.h"
     32 #include "core/dom/Element.h"
     33 #include "wtf/Assertions.h"
     34 
     35 namespace blink {
     36 
     37 RemoveCSSPropertyCommand::RemoveCSSPropertyCommand(Document& document, PassRefPtrWillBeRawPtr<Element> element, CSSPropertyID property)
     38     : SimpleEditCommand(document)
     39     , m_element(element)
     40     , m_property(property)
     41     , m_important(false)
     42 {
     43     ASSERT(m_element);
     44 }
     45 
     46 RemoveCSSPropertyCommand::~RemoveCSSPropertyCommand()
     47 {
     48 }
     49 
     50 void RemoveCSSPropertyCommand::doApply()
     51 {
     52     const StylePropertySet* style = m_element->inlineStyle();
     53     if (!style)
     54         return;
     55 
     56     m_oldValue = style->getPropertyValue(m_property);
     57     m_important = style->propertyIsImportant(m_property);
     58 
     59     // Mutate using the CSSOM wrapper so we get the same event behavior as a script.
     60     // Setting to null string removes the property. We don't have internal version of removeProperty.
     61     m_element->style()->setPropertyInternal(m_property, String(), false, IGNORE_EXCEPTION);
     62 }
     63 
     64 void RemoveCSSPropertyCommand::doUnapply()
     65 {
     66     m_element->style()->setPropertyInternal(m_property, m_oldValue, m_important, IGNORE_EXCEPTION);
     67 }
     68 
     69 void RemoveCSSPropertyCommand::trace(Visitor* visitor)
     70 {
     71     visitor->trace(m_element);
     72     SimpleEditCommand::trace(visitor);
     73 }
     74 
     75 } // namespace blink
     76