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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 1999 Antti Koivisto (koivisto (at) kde.org)
      4  *           (C) 2000 Dirk Mueller (mueller (at) kde.org)
      5  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
      6  *
      7  * This library is free software; you can redistribute it and/or
      8  * modify it under the terms of the GNU Library General Public
      9  * License as published by the Free Software Foundation; either
     10  * version 2 of the License, or (at your option) any later version.
     11  *
     12  * This library is distributed in the hope that it will be useful,
     13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     15  * Library General Public License for more details.
     16  *
     17  * You should have received a copy of the GNU Library General Public License
     18  * along with this library; see the file COPYING.LIB.  If not, write to
     19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     20  * Boston, MA 02110-1301, USA.
     21  *
     22  */
     23 
     24 #ifndef HTMLLabelElement_h
     25 #define HTMLLabelElement_h
     26 
     27 #include "core/html/FormAssociatedElement.h"
     28 #include "core/html/HTMLElement.h"
     29 #include "core/html/LabelableElement.h"
     30 
     31 namespace blink {
     32 
     33 class HTMLLabelElement FINAL : public HTMLElement, public FormAssociatedElement {
     34     DEFINE_WRAPPERTYPEINFO();
     35     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLLabelElement);
     36 public:
     37     static PassRefPtrWillBeRawPtr<HTMLLabelElement> create(Document&, HTMLFormElement*);
     38     LabelableElement* control() const;
     39 
     40     virtual bool willRespondToMouseClickEvents() OVERRIDE;
     41 
     42     virtual void trace(Visitor*) OVERRIDE;
     43 
     44     virtual HTMLFormElement* formOwner() const OVERRIDE;
     45 
     46 
     47 #if !ENABLE(OILPAN)
     48     using Node::ref;
     49     using Node::deref;
     50 #endif
     51 
     52 private:
     53     explicit HTMLLabelElement(Document&, HTMLFormElement*);
     54     bool isInInteractiveContent(Node*) const;
     55 
     56     virtual bool rendererIsFocusable() const OVERRIDE;
     57     virtual bool isInteractiveContent() const OVERRIDE;
     58     virtual void accessKeyAction(bool sendMouseEvents) OVERRIDE;
     59 
     60     virtual void attributeWillChange(const QualifiedName&, const AtomicString& oldValue, const AtomicString& newValue) OVERRIDE;
     61     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     62     virtual void removedFrom(ContainerNode*) OVERRIDE;
     63 
     64     // Overridden to update the hover/active state of the corresponding control.
     65     virtual void setActive(bool = true) OVERRIDE;
     66     virtual void setHovered(bool = true) OVERRIDE;
     67 
     68     // Overridden to either click() or focus() the corresponding control.
     69     virtual void defaultEventHandler(Event*) OVERRIDE;
     70 
     71     virtual void focus(bool restorePreviousSelection, FocusType) OVERRIDE;
     72 
     73     // FormAssociatedElement methods
     74     virtual bool isFormControlElement() const OVERRIDE { return false; }
     75     virtual bool isEnumeratable() const OVERRIDE { return false; }
     76     virtual bool isLabelElement() const OVERRIDE { return true; }
     77 #if !ENABLE(OILPAN)
     78     virtual void refFormAssociatedElement() OVERRIDE { ref(); }
     79     virtual void derefFormAssociatedElement() OVERRIDE { deref(); }
     80 #endif
     81 
     82     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     83 
     84     void updateLabel(TreeScope&, const AtomicString& oldForAttributeValue, const AtomicString& newForAttributeValue);
     85 };
     86 
     87 
     88 template<typename T> inline const T& toElement(const FormAssociatedElement&);
     89 template<typename T> inline const T* toElement(const FormAssociatedElement*);
     90 // Make toHTMLLabelElement() accept a FormAssociatedElement as input instead of a Node.
     91 template<> inline const HTMLLabelElement* toElement<HTMLLabelElement>(const FormAssociatedElement* element)
     92 {
     93     const HTMLLabelElement* labelElement = static_cast<const HTMLLabelElement*>(element);
     94     // FormAssociatedElement doesn't have hasTagName, hence check for assert.
     95     ASSERT_WITH_SECURITY_IMPLICATION(!labelElement || labelElement->hasTagName(HTMLNames::labelTag));
     96     return labelElement;
     97 }
     98 
     99 template<> inline const HTMLLabelElement& toElement<HTMLLabelElement>(const FormAssociatedElement& element)
    100 {
    101     const HTMLLabelElement& labelElement = static_cast<const HTMLLabelElement&>(element);
    102     // FormAssociatedElement doesn't have hasTagName, hence check for assert.
    103     ASSERT_WITH_SECURITY_IMPLICATION(labelElement.hasTagName(HTMLNames::labelTag));
    104     return labelElement;
    105 }
    106 
    107 } // namespace blink
    108 
    109 #endif // HTMLLabelElement_h
    110