1/* 2 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 * 19 */ 20 21#include "config.h" 22#if ENABLE(METER_ELEMENT) 23#include "HTMLMeterElement.h" 24 25#include "Attribute.h" 26#include "EventNames.h" 27#include "ExceptionCode.h" 28#include "FormDataList.h" 29#include "NodeRenderingContext.h" 30#include "HTMLFormElement.h" 31#include "HTMLNames.h" 32#include "HTMLParserIdioms.h" 33#include "MeterShadowElement.h" 34#include "Page.h" 35#include "RenderMeter.h" 36#include "RenderTheme.h" 37#include "ShadowRoot.h" 38#include <wtf/StdLibExtras.h> 39 40namespace WebCore { 41 42using namespace HTMLNames; 43 44HTMLMeterElement::HTMLMeterElement(const QualifiedName& tagName, Document* document) 45 : LabelableElement(tagName, document) 46{ 47 ASSERT(hasTagName(meterTag)); 48} 49 50HTMLMeterElement::~HTMLMeterElement() 51{ 52} 53 54PassRefPtr<HTMLMeterElement> HTMLMeterElement::create(const QualifiedName& tagName, Document* document) 55{ 56 RefPtr<HTMLMeterElement> meter = adoptRef(new HTMLMeterElement(tagName, document)); 57 meter->ensureUserAgentShadowRoot(); 58 return meter; 59} 60 61RenderObject* HTMLMeterElement::createRenderer(RenderArena* arena, RenderStyle* style) 62{ 63 if (hasAuthorShadowRoot() || !document()->page()->theme()->supportsMeter(style->appearance())) 64 return RenderObject::createObject(this, style); 65 66 return new (arena) RenderMeter(this); 67} 68 69bool HTMLMeterElement::childShouldCreateRenderer(const NodeRenderingContext& childContext) const 70{ 71 return childContext.isOnUpperEncapsulationBoundary() && HTMLElement::childShouldCreateRenderer(childContext); 72} 73 74void HTMLMeterElement::parseAttribute(const QualifiedName& name, const AtomicString& value) 75{ 76 if (name == valueAttr || name == minAttr || name == maxAttr || name == lowAttr || name == highAttr || name == optimumAttr) 77 didElementStateChange(); 78 else 79 LabelableElement::parseAttribute(name, value); 80} 81 82double HTMLMeterElement::min() const 83{ 84 return parseToDoubleForNumberType(getAttribute(minAttr), 0); 85} 86 87void HTMLMeterElement::setMin(double min, ExceptionCode& ec) 88{ 89 if (!std::isfinite(min)) { 90 ec = NOT_SUPPORTED_ERR; 91 return; 92 } 93 setAttribute(minAttr, String::number(min)); 94} 95 96double HTMLMeterElement::max() const 97{ 98 return std::max(parseToDoubleForNumberType(getAttribute(maxAttr), std::max(1.0, min())), min()); 99} 100 101void HTMLMeterElement::setMax(double max, ExceptionCode& ec) 102{ 103 if (!std::isfinite(max)) { 104 ec = NOT_SUPPORTED_ERR; 105 return; 106 } 107 setAttribute(maxAttr, String::number(max)); 108} 109 110double HTMLMeterElement::value() const 111{ 112 double value = parseToDoubleForNumberType(getAttribute(valueAttr), 0); 113 return std::min(std::max(value, min()), max()); 114} 115 116void HTMLMeterElement::setValue(double value, ExceptionCode& ec) 117{ 118 if (!std::isfinite(value)) { 119 ec = NOT_SUPPORTED_ERR; 120 return; 121 } 122 setAttribute(valueAttr, String::number(value)); 123} 124 125double HTMLMeterElement::low() const 126{ 127 double low = parseToDoubleForNumberType(getAttribute(lowAttr), min()); 128 return std::min(std::max(low, min()), max()); 129} 130 131void HTMLMeterElement::setLow(double low, ExceptionCode& ec) 132{ 133 if (!std::isfinite(low)) { 134 ec = NOT_SUPPORTED_ERR; 135 return; 136 } 137 setAttribute(lowAttr, String::number(low)); 138} 139 140double HTMLMeterElement::high() const 141{ 142 double high = parseToDoubleForNumberType(getAttribute(highAttr), max()); 143 return std::min(std::max(high, low()), max()); 144} 145 146void HTMLMeterElement::setHigh(double high, ExceptionCode& ec) 147{ 148 if (!std::isfinite(high)) { 149 ec = NOT_SUPPORTED_ERR; 150 return; 151 } 152 setAttribute(highAttr, String::number(high)); 153} 154 155double HTMLMeterElement::optimum() const 156{ 157 double optimum = parseToDoubleForNumberType(getAttribute(optimumAttr), (max() + min()) / 2); 158 return std::min(std::max(optimum, min()), max()); 159} 160 161void HTMLMeterElement::setOptimum(double optimum, ExceptionCode& ec) 162{ 163 if (!std::isfinite(optimum)) { 164 ec = NOT_SUPPORTED_ERR; 165 return; 166 } 167 setAttribute(optimumAttr, String::number(optimum)); 168} 169 170HTMLMeterElement::GaugeRegion HTMLMeterElement::gaugeRegion() const 171{ 172 double lowValue = low(); 173 double highValue = high(); 174 double theValue = value(); 175 double optimumValue = optimum(); 176 177 if (optimumValue < lowValue) { 178 // The optimum range stays under low 179 if (theValue <= lowValue) 180 return GaugeRegionOptimum; 181 if (theValue <= highValue) 182 return GaugeRegionSuboptimal; 183 return GaugeRegionEvenLessGood; 184 } 185 186 if (highValue < optimumValue) { 187 // The optimum range stays over high 188 if (highValue <= theValue) 189 return GaugeRegionOptimum; 190 if (lowValue <= theValue) 191 return GaugeRegionSuboptimal; 192 return GaugeRegionEvenLessGood; 193 } 194 195 // The optimum range stays between high and low. 196 // According to the standard, <meter> never show GaugeRegionEvenLessGood in this case 197 // because the value is never less or greater than min or max. 198 if (lowValue <= theValue && theValue <= highValue) 199 return GaugeRegionOptimum; 200 return GaugeRegionSuboptimal; 201} 202 203double HTMLMeterElement::valueRatio() const 204{ 205 double min = this->min(); 206 double max = this->max(); 207 double value = this->value(); 208 209 if (max <= min) 210 return 0; 211 return (value - min) / (max - min); 212} 213 214void HTMLMeterElement::didElementStateChange() 215{ 216 m_value->setWidthPercentage(valueRatio()*100); 217 m_value->updatePseudo(); 218 if (RenderMeter* render = renderMeter()) 219 render->updateFromElement(); 220} 221 222RenderMeter* HTMLMeterElement::renderMeter() const 223{ 224 if (renderer() && renderer()->isMeter()) 225 return static_cast<RenderMeter*>(renderer()); 226 227 RenderObject* renderObject = userAgentShadowRoot()->firstChild()->renderer(); 228 ASSERT(!renderObject || renderObject->isMeter()); 229 return static_cast<RenderMeter*>(renderObject); 230} 231 232void HTMLMeterElement::didAddUserAgentShadowRoot(ShadowRoot* root) 233{ 234 ASSERT(!m_value); 235 236 RefPtr<MeterInnerElement> inner = MeterInnerElement::create(document()); 237 root->appendChild(inner); 238 239 RefPtr<MeterBarElement> bar = MeterBarElement::create(document()); 240 m_value = MeterValueElement::create(document()); 241 m_value->setWidthPercentage(0); 242 m_value->updatePseudo(); 243 bar->appendChild(m_value, ASSERT_NO_EXCEPTION); 244 245 inner->appendChild(bar, ASSERT_NO_EXCEPTION); 246} 247 248} // namespace 249#endif 250