1 /*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * (C) 1999 Antti Koivisto (koivisto@kde.org)
4 * (C) 2001 Dirk Mueller (mueller@kde.org)
5 * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
6 * (C) 2006 Alexey Proskuryakov (ap@nypop.com)
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB. If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
22 *
23 */
24
25 #include "config.h"
26 #include "HTMLLabelElement.h"
27
28 #include "Document.h"
29 #include "Event.h"
30 #include "EventNames.h"
31 #include "HTMLFormControlElement.h"
32 #include "HTMLFormElement.h"
33 #include "HTMLNames.h"
34
35 namespace WebCore {
36
37 using namespace HTMLNames;
38
nodeAsLabelableFormControl(Node * node)39 static HTMLFormControlElement* nodeAsLabelableFormControl(Node* node)
40 {
41 if (!node || !node->isElementNode() || !static_cast<Element*>(node)->isFormControlElement())
42 return 0;
43
44 HTMLFormControlElement* formControlElement = static_cast<HTMLFormControlElement*>(node);
45 if (!formControlElement->isLabelable())
46 return 0;
47
48 return formControlElement;
49 }
50
HTMLLabelElement(const QualifiedName & tagName,Document * document)51 inline HTMLLabelElement::HTMLLabelElement(const QualifiedName& tagName, Document* document)
52 : HTMLElement(tagName, document)
53 {
54 ASSERT(hasTagName(labelTag));
55 }
56
create(const QualifiedName & tagName,Document * document)57 PassRefPtr<HTMLLabelElement> HTMLLabelElement::create(const QualifiedName& tagName, Document* document)
58 {
59 return adoptRef(new HTMLLabelElement(tagName, document));
60 }
61
isFocusable() const62 bool HTMLLabelElement::isFocusable() const
63 {
64 return false;
65 }
66
control()67 HTMLFormControlElement* HTMLLabelElement::control()
68 {
69 const AtomicString& controlId = getAttribute(forAttr);
70 if (controlId.isNull()) {
71 // Search the children and descendants of the label element for a form element.
72 // per http://dev.w3.org/html5/spec/Overview.html#the-label-element
73 // the form element must be "labelable form-associated element".
74 Node* node = this;
75 while ((node = node->traverseNextNode(this))) {
76 if (HTMLFormControlElement* formControlElement = nodeAsLabelableFormControl(node))
77 return formControlElement;
78 }
79 return 0;
80 }
81
82 // Find the first element whose id is controlId. If it is found and it is a labelable form control,
83 // return it, otherwise return 0.
84 return nodeAsLabelableFormControl(document()->getElementById(controlId));
85 }
86
setActive(bool down,bool pause)87 void HTMLLabelElement::setActive(bool down, bool pause)
88 {
89 if (down == active())
90 return;
91
92 // Update our status first.
93 HTMLElement::setActive(down, pause);
94
95 // Also update our corresponding control.
96 if (HTMLElement* element = control())
97 element->setActive(down, pause);
98 }
99
setHovered(bool over)100 void HTMLLabelElement::setHovered(bool over)
101 {
102 if (over == hovered())
103 return;
104
105 // Update our status first.
106 HTMLElement::setHovered(over);
107
108 // Also update our corresponding control.
109 if (HTMLElement* element = control())
110 element->setHovered(over);
111 }
112
defaultEventHandler(Event * evt)113 void HTMLLabelElement::defaultEventHandler(Event* evt)
114 {
115 static bool processingClick = false;
116
117 if (evt->type() == eventNames().clickEvent && !processingClick) {
118 RefPtr<HTMLElement> element = control();
119
120 // If we can't find a control or if the control received the click
121 // event, then there's no need for us to do anything.
122 if (!element || (evt->target() && element->containsIncludingShadowDOM(evt->target()->toNode())))
123 return;
124
125 processingClick = true;
126
127 // Click the corresponding control.
128 element->dispatchSimulatedClick(evt);
129
130 // If the control can be focused via the mouse, then do that too.
131 if (element->isMouseFocusable())
132 element->focus();
133
134 processingClick = false;
135
136 evt->setDefaultHandled();
137 }
138
139 HTMLElement::defaultEventHandler(evt);
140 }
141
focus(bool)142 void HTMLLabelElement::focus(bool)
143 {
144 // to match other browsers, always restore previous selection
145 if (HTMLElement* element = control())
146 element->focus();
147 }
148
accessKeyAction(bool sendToAnyElement)149 void HTMLLabelElement::accessKeyAction(bool sendToAnyElement)
150 {
151 if (HTMLElement* element = control())
152 element->accessKeyAction(sendToAnyElement);
153 else
154 HTMLElement::accessKeyAction(sendToAnyElement);
155 }
156
parseMappedAttribute(Attribute * attribute)157 void HTMLLabelElement::parseMappedAttribute(Attribute* attribute)
158 {
159 if (attribute->name() == forAttr) {
160 // htmlFor attribute change affects other nodes than this.
161 // Clear the caches to ensure that the labels caches are cleared.
162 if (document())
163 document()->notifyLocalNodeListsLabelChanged();
164 } else
165 HTMLElement::parseMappedAttribute(attribute);
166 }
167
168 } // namespace
169