third_party/WebKit/Source/core/html/HTMLLabelElement.h

   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/CoreExport.h"
  28 #include "core/html/FormAssociatedElement.h"
  29 #include "core/html/HTMLElement.h"
  30 #include "core/html/LabelableElement.h"
  31
  32 namespace blink {
  33
  34 class CORE_EXPORT HTMLLabelElement final : public HTMLElement, public FormAssociatedElement {
  35     DEFINE_WRAPPERTYPEINFO();
  36     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLLabelElement);
  37 public:
  38     static PassRefPtrWillBeRawPtr<HTMLLabelElement> create(Document&, HTMLFormElement*);
  39     LabelableElement* control() const;
  40
  41     bool willRespondToMouseClickEvents() override;
  42
  43     DECLARE_VIRTUAL_TRACE();
  44
  45     HTMLFormElement* formOwner() const override;
  46
  47
  48 #if !ENABLE(OILPAN)
  49     using Node::ref;
  50     using Node::deref;
  51 #endif
  52
  53 private:
  54     explicit HTMLLabelElement(Document&, HTMLFormElement*);
  55     bool isInInteractiveContent(Node*) const;
  56
  57     bool layoutObjectIsFocusable() const override;
  58     bool isInteractiveContent() const override;
  59     void accessKeyAction(bool sendMouseEvents) override;
  60
  61     void attributeWillChange(const QualifiedName&, const AtomicString& oldValue, const AtomicString& newValue) override;
  62     InsertionNotificationRequest insertedInto(ContainerNode*) override;
  63     void removedFrom(ContainerNode*) override;
  64
  65     // Overridden to update the hover/active state of the corresponding control.
  66     void setActive(bool = true) override;
  67     void setHovered(bool = true) override;
  68
  69     // Overridden to either click() or focus() the corresponding control.
  70     void defaultEventHandler(Event*) override;
  71
  72     void focus(bool restorePreviousSelection, WebFocusType, InputDeviceCapabilities* sourceCapabilities) override;
  73
  74     // FormAssociatedElement methods
  75     bool isFormControlElement() const override { return false; }
  76     bool isEnumeratable() const override { return false; }
  77     bool isLabelElement() const override { return true; }
  78 #if !ENABLE(OILPAN)
  79     void refFormAssociatedElement() override { ref(); }
  80     void derefFormAssociatedElement() override { deref(); }
  81 #endif
  82
  83     void parseAttribute(const QualifiedName&, const AtomicString&) override;
  84
  85     void updateLabel(TreeScope&, const AtomicString& oldForAttributeValue, const AtomicString& newForAttributeValue);
  86
  87     bool m_processingClick;
  88 };
  89
  90
  91 template<typename T> inline const T& toElement(const FormAssociatedElement&);
  92 template<typename T> inline const T* toElement(const FormAssociatedElement*);
  93 // Make toHTMLLabelElement() accept a FormAssociatedElement as input instead of a Node.
  94 template<> inline const HTMLLabelElement* toElement<HTMLLabelElement>(const FormAssociatedElement* element)
  95 {
  96     const HTMLLabelElement* labelElement = static_cast<const HTMLLabelElement*>(element);
  97     // FormAssociatedElement doesn't have hasTagName, hence check for assert.
  98     ASSERT_WITH_SECURITY_IMPLICATION(!labelElement || labelElement->hasTagName(HTMLNames::labelTag));
  99     return labelElement;
 100 }
 101
 102 template<> inline const HTMLLabelElement& toElement<HTMLLabelElement>(const FormAssociatedElement& element)
 103 {
 104     const HTMLLabelElement& labelElement = static_cast<const HTMLLabelElement&>(element);
 105     // FormAssociatedElement doesn't have hasTagName, hence check for assert.
 106     ASSERT_WITH_SECURITY_IMPLICATION(labelElement.hasTagName(HTMLNames::labelTag));
 107     return labelElement;
 108 }
 109
 110 } // namespace blink
 111
 112 #endif // HTMLLabelElement_h