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 "FormAssociatedElement.h" 32#include "HTMLNames.h" 33#include "NodeTraversal.h" 34 35namespace WebCore { 36 37using namespace HTMLNames; 38 39static LabelableElement* nodeAsLabelableElement(Node* node) 40{ 41 if (!node || !node->isHTMLElement()) 42 return 0; 43 44 HTMLElement* element = static_cast<HTMLElement*>(node); 45 if (!element->isLabelable()) 46 return 0; 47 48 LabelableElement* labelableElement = static_cast<LabelableElement*>(element); 49 if (!labelableElement->supportLabels()) 50 return 0; 51 52 return labelableElement; 53} 54 55inline HTMLLabelElement::HTMLLabelElement(const QualifiedName& tagName, Document* document) 56 : HTMLElement(tagName, document) 57{ 58 ASSERT(hasTagName(labelTag)); 59} 60 61PassRefPtr<HTMLLabelElement> HTMLLabelElement::create(const QualifiedName& tagName, Document* document) 62{ 63 return adoptRef(new HTMLLabelElement(tagName, document)); 64} 65 66bool HTMLLabelElement::isFocusable() const 67{ 68 return false; 69} 70 71LabelableElement* HTMLLabelElement::control() 72{ 73 const AtomicString& controlId = getAttribute(forAttr); 74 if (controlId.isNull()) { 75 // Search the children and descendants of the label element for a form element. 76 // per http://dev.w3.org/html5/spec/Overview.html#the-label-element 77 // the form element must be "labelable form-associated element". 78 Element* element = this; 79 while ((element = ElementTraversal::next(element, this))) { 80 if (LabelableElement* labelableElement = nodeAsLabelableElement(element)) 81 return labelableElement; 82 } 83 return 0; 84 } 85 86 // Find the first element whose id is controlId. If it is found and it is a labelable form control, 87 // return it, otherwise return 0. 88 return nodeAsLabelableElement(treeScope()->getElementById(controlId)); 89} 90 91HTMLFormElement* HTMLLabelElement::form() const 92{ 93 return FormAssociatedElement::findAssociatedForm(this, 0); 94} 95 96void HTMLLabelElement::setActive(bool down, bool pause) 97{ 98 if (down == active()) 99 return; 100 101 // Update our status first. 102 HTMLElement::setActive(down, pause); 103 104 // Also update our corresponding control. 105 if (HTMLElement* element = control()) 106 element->setActive(down, pause); 107} 108 109void HTMLLabelElement::setHovered(bool over) 110{ 111 if (over == hovered()) 112 return; 113 114 // Update our status first. 115 HTMLElement::setHovered(over); 116 117 // Also update our corresponding control. 118 if (HTMLElement* element = control()) 119 element->setHovered(over); 120} 121 122void HTMLLabelElement::defaultEventHandler(Event* evt) 123{ 124 static bool processingClick = false; 125 126 if (evt->type() == eventNames().clickEvent && !processingClick) { 127 RefPtr<HTMLElement> element = control(); 128 129 // If we can't find a control or if the control received the click 130 // event, then there's no need for us to do anything. 131 if (!element || (evt->target() && element->containsIncludingShadowDOM(evt->target()->toNode()))) 132 return; 133 134 processingClick = true; 135 136 // Click the corresponding control. 137 element->dispatchSimulatedClick(evt); 138 139 if (element->isMouseFocusable()) 140 element->focus(); 141 142 processingClick = false; 143 144 evt->setDefaultHandled(); 145 } 146 147 HTMLElement::defaultEventHandler(evt); 148} 149 150bool HTMLLabelElement::willRespondToMouseClickEvents() 151{ 152 if (control() && control()->willRespondToMouseClickEvents()) 153 return true; 154 155 return HTMLElement::willRespondToMouseClickEvents(); 156} 157 158void HTMLLabelElement::focus(bool, FocusDirection direction) 159{ 160 // to match other browsers, always restore previous selection 161 if (HTMLElement* element = control()) 162 element->focus(true, direction); 163} 164 165void HTMLLabelElement::accessKeyAction(bool sendMouseEvents) 166{ 167 if (HTMLElement* element = control()) 168 element->accessKeyAction(sendMouseEvents); 169 else 170 HTMLElement::accessKeyAction(sendMouseEvents); 171} 172 173} // namespace 174