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1  /*
2   * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3   *           (C) 1999 Antti Koivisto (koivisto@kde.org)
4   *           (C) 2000 Dirk Mueller (mueller@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
isFormControlElement()74      virtual bool isFormControlElement() const OVERRIDE { return false; }
isEnumeratable()75      virtual bool isEnumeratable() const OVERRIDE { return false; }
isLabelElement()76      virtual bool isLabelElement() const OVERRIDE { return true; }
77  #if !ENABLE(OILPAN)
refFormAssociatedElement()78      virtual void refFormAssociatedElement() OVERRIDE { ref(); }
derefFormAssociatedElement()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