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 "ElementIterator.h" 27#include "EventNames.h" 28#include "ExceptionCode.h" 29#include "FormDataList.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 39namespace WebCore { 40 41using namespace HTMLNames; 42 43HTMLMeterElement::HTMLMeterElement(const QualifiedName& tagName, Document& document) 44 : LabelableElement(tagName, document) 45{ 46 ASSERT(hasTagName(meterTag)); 47} 48 49HTMLMeterElement::~HTMLMeterElement() 50{ 51} 52 53PassRefPtr<HTMLMeterElement> HTMLMeterElement::create(const QualifiedName& tagName, Document& document) 54{ 55 RefPtr<HTMLMeterElement> meter = adoptRef(new HTMLMeterElement(tagName, document)); 56 meter->ensureUserAgentShadowRoot(); 57 return meter; 58} 59 60RenderPtr<RenderElement> HTMLMeterElement::createElementRenderer(PassRef<RenderStyle> style) 61{ 62 if (!document().page()->theme().supportsMeter(style.get().appearance())) 63 return RenderElement::createFor(*this, WTF::move(style)); 64 65 return createRenderer<RenderMeter>(*this, WTF::move(style)); 66} 67 68bool HTMLMeterElement::childShouldCreateRenderer(const Node& child) const 69{ 70 return hasShadowRootParent(child) && HTMLElement::childShouldCreateRenderer(child); 71} 72 73void HTMLMeterElement::parseAttribute(const QualifiedName& name, const AtomicString& value) 74{ 75 if (name == valueAttr || name == minAttr || name == maxAttr || name == lowAttr || name == highAttr || name == optimumAttr) 76 didElementStateChange(); 77 else 78 LabelableElement::parseAttribute(name, value); 79} 80 81double HTMLMeterElement::min() const 82{ 83 return parseToDoubleForNumberType(getAttribute(minAttr), 0); 84} 85 86void HTMLMeterElement::setMin(double min, ExceptionCode& ec) 87{ 88 if (!std::isfinite(min)) { 89 ec = NOT_SUPPORTED_ERR; 90 return; 91 } 92 setAttribute(minAttr, AtomicString::number(min)); 93} 94 95double HTMLMeterElement::max() const 96{ 97 return std::max(parseToDoubleForNumberType(getAttribute(maxAttr), std::max(1.0, min())), min()); 98} 99 100void HTMLMeterElement::setMax(double max, ExceptionCode& ec) 101{ 102 if (!std::isfinite(max)) { 103 ec = NOT_SUPPORTED_ERR; 104 return; 105 } 106 setAttribute(maxAttr, AtomicString::number(max)); 107} 108 109double HTMLMeterElement::value() const 110{ 111 double value = parseToDoubleForNumberType(getAttribute(valueAttr), 0); 112 return std::min(std::max(value, min()), max()); 113} 114 115void HTMLMeterElement::setValue(double value, ExceptionCode& ec) 116{ 117 if (!std::isfinite(value)) { 118 ec = NOT_SUPPORTED_ERR; 119 return; 120 } 121 setAttribute(valueAttr, AtomicString::number(value)); 122} 123 124double HTMLMeterElement::low() const 125{ 126 double low = parseToDoubleForNumberType(getAttribute(lowAttr), min()); 127 return std::min(std::max(low, min()), max()); 128} 129 130void HTMLMeterElement::setLow(double low, ExceptionCode& ec) 131{ 132 if (!std::isfinite(low)) { 133 ec = NOT_SUPPORTED_ERR; 134 return; 135 } 136 setAttribute(lowAttr, AtomicString::number(low)); 137} 138 139double HTMLMeterElement::high() const 140{ 141 double high = parseToDoubleForNumberType(getAttribute(highAttr), max()); 142 return std::min(std::max(high, low()), max()); 143} 144 145void HTMLMeterElement::setHigh(double high, ExceptionCode& ec) 146{ 147 if (!std::isfinite(high)) { 148 ec = NOT_SUPPORTED_ERR; 149 return; 150 } 151 setAttribute(highAttr, AtomicString::number(high)); 152} 153 154double HTMLMeterElement::optimum() const 155{ 156 double optimum = parseToDoubleForNumberType(getAttribute(optimumAttr), (max() + min()) / 2); 157 return std::min(std::max(optimum, min()), max()); 158} 159 160void HTMLMeterElement::setOptimum(double optimum, ExceptionCode& ec) 161{ 162 if (!std::isfinite(optimum)) { 163 ec = NOT_SUPPORTED_ERR; 164 return; 165 } 166 setAttribute(optimumAttr, AtomicString::number(optimum)); 167} 168 169HTMLMeterElement::GaugeRegion HTMLMeterElement::gaugeRegion() const 170{ 171 double lowValue = low(); 172 double highValue = high(); 173 double theValue = value(); 174 double optimumValue = optimum(); 175 176 if (optimumValue < lowValue) { 177 // The optimum range stays under low 178 if (theValue <= lowValue) 179 return GaugeRegionOptimum; 180 if (theValue <= highValue) 181 return GaugeRegionSuboptimal; 182 return GaugeRegionEvenLessGood; 183 } 184 185 if (highValue < optimumValue) { 186 // The optimum range stays over high 187 if (highValue <= theValue) 188 return GaugeRegionOptimum; 189 if (lowValue <= theValue) 190 return GaugeRegionSuboptimal; 191 return GaugeRegionEvenLessGood; 192 } 193 194 // The optimum range stays between high and low. 195 // According to the standard, <meter> never show GaugeRegionEvenLessGood in this case 196 // because the value is never less or greater than min or max. 197 if (lowValue <= theValue && theValue <= highValue) 198 return GaugeRegionOptimum; 199 return GaugeRegionSuboptimal; 200} 201 202double HTMLMeterElement::valueRatio() const 203{ 204 double min = this->min(); 205 double max = this->max(); 206 double value = this->value(); 207 208 if (max <= min) 209 return 0; 210 return (value - min) / (max - min); 211} 212 213void HTMLMeterElement::didElementStateChange() 214{ 215 m_value->setWidthPercentage(valueRatio()*100); 216 m_value->updatePseudo(); 217 if (RenderMeter* render = renderMeter()) 218 render->updateFromElement(); 219} 220 221RenderMeter* HTMLMeterElement::renderMeter() const 222{ 223 if (renderer() && renderer()->isMeter()) 224 return toRenderMeter(renderer()); 225 return toRenderMeter(descendantsOfType<Element>(*userAgentShadowRoot()).first()->renderer()); 226} 227 228void HTMLMeterElement::didAddUserAgentShadowRoot(ShadowRoot* root) 229{ 230 ASSERT(!m_value); 231 232 RefPtr<MeterInnerElement> inner = MeterInnerElement::create(document()); 233 root->appendChild(inner); 234 235 RefPtr<MeterBarElement> bar = MeterBarElement::create(document()); 236 m_value = MeterValueElement::create(document()); 237 m_value->setWidthPercentage(0); 238 m_value->updatePseudo(); 239 bar->appendChild(m_value, ASSERT_NO_EXCEPTION); 240 241 inner->appendChild(bar, ASSERT_NO_EXCEPTION); 242} 243 244} // namespace 245#endif 246