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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