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 23#include "core/html/HTMLMeterElement.h" 24 25#include "bindings/core/v8/ExceptionMessages.h" 26#include "bindings/core/v8/ExceptionState.h" 27#include "bindings/core/v8/ExceptionStatePlaceholder.h" 28#include "core/HTMLNames.h" 29#include "core/dom/ExceptionCode.h" 30#include "core/dom/shadow/ShadowRoot.h" 31#include "core/frame/UseCounter.h" 32#include "core/html/parser/HTMLParserIdioms.h" 33#include "core/html/shadow/MeterShadowElement.h" 34#include "core/rendering/RenderMeter.h" 35#include "core/rendering/RenderTheme.h" 36 37namespace blink { 38 39using namespace HTMLNames; 40 41HTMLMeterElement::HTMLMeterElement(Document& document) 42 : LabelableElement(meterTag, document) 43{ 44 UseCounter::count(document, UseCounter::MeterElement); 45} 46 47HTMLMeterElement::~HTMLMeterElement() 48{ 49} 50 51PassRefPtrWillBeRawPtr<HTMLMeterElement> HTMLMeterElement::create(Document& document) 52{ 53 RefPtrWillBeRawPtr<HTMLMeterElement> meter = adoptRefWillBeNoop(new HTMLMeterElement(document)); 54 meter->ensureUserAgentShadowRoot(); 55 return meter.release(); 56} 57 58RenderObject* HTMLMeterElement::createRenderer(RenderStyle* style) 59{ 60 if (hasAuthorShadowRoot() || !RenderTheme::theme().supportsMeter(style->appearance())) 61 return RenderObject::createObject(this, style); 62 63 return new RenderMeter(this); 64} 65 66void HTMLMeterElement::parseAttribute(const QualifiedName& name, const AtomicString& value) 67{ 68 if (name == valueAttr || name == minAttr || name == maxAttr || name == lowAttr || name == highAttr || name == optimumAttr) 69 didElementStateChange(); 70 else 71 LabelableElement::parseAttribute(name, value); 72} 73 74double HTMLMeterElement::value() const 75{ 76 double value = getFloatingPointAttribute(valueAttr, 0); 77 return std::min(std::max(value, min()), max()); 78} 79 80void HTMLMeterElement::setValue(double value) 81{ 82 setFloatingPointAttribute(valueAttr, value); 83} 84 85double HTMLMeterElement::min() const 86{ 87 return getFloatingPointAttribute(minAttr, 0); 88} 89 90void HTMLMeterElement::setMin(double min) 91{ 92 setFloatingPointAttribute(minAttr, min); 93} 94 95double HTMLMeterElement::max() const 96{ 97 return std::max(getFloatingPointAttribute(maxAttr, std::max(1.0, min())), min()); 98} 99 100void HTMLMeterElement::setMax(double max) 101{ 102 setFloatingPointAttribute(maxAttr, max); 103} 104 105double HTMLMeterElement::low() const 106{ 107 double low = getFloatingPointAttribute(lowAttr, min()); 108 return std::min(std::max(low, min()), max()); 109} 110 111void HTMLMeterElement::setLow(double low) 112{ 113 setFloatingPointAttribute(lowAttr, low); 114} 115 116double HTMLMeterElement::high() const 117{ 118 double high = getFloatingPointAttribute(highAttr, max()); 119 return std::min(std::max(high, low()), max()); 120} 121 122void HTMLMeterElement::setHigh(double high) 123{ 124 setFloatingPointAttribute(highAttr, high); 125} 126 127double HTMLMeterElement::optimum() const 128{ 129 double optimum = getFloatingPointAttribute(optimumAttr, (max() + min()) / 2); 130 return std::min(std::max(optimum, min()), max()); 131} 132 133void HTMLMeterElement::setOptimum(double optimum) 134{ 135 setFloatingPointAttribute(optimumAttr, optimum); 136} 137 138HTMLMeterElement::GaugeRegion HTMLMeterElement::gaugeRegion() const 139{ 140 double lowValue = low(); 141 double highValue = high(); 142 double theValue = value(); 143 double optimumValue = optimum(); 144 145 if (optimumValue < lowValue) { 146 // The optimum range stays under low 147 if (theValue <= lowValue) 148 return GaugeRegionOptimum; 149 if (theValue <= highValue) 150 return GaugeRegionSuboptimal; 151 return GaugeRegionEvenLessGood; 152 } 153 154 if (highValue < optimumValue) { 155 // The optimum range stays over high 156 if (highValue <= theValue) 157 return GaugeRegionOptimum; 158 if (lowValue <= theValue) 159 return GaugeRegionSuboptimal; 160 return GaugeRegionEvenLessGood; 161 } 162 163 // The optimum range stays between high and low. 164 // According to the standard, <meter> never show GaugeRegionEvenLessGood in this case 165 // because the value is never less or greater than min or max. 166 if (lowValue <= theValue && theValue <= highValue) 167 return GaugeRegionOptimum; 168 return GaugeRegionSuboptimal; 169} 170 171double HTMLMeterElement::valueRatio() const 172{ 173 double min = this->min(); 174 double max = this->max(); 175 double value = this->value(); 176 177 if (max <= min) 178 return 0; 179 return (value - min) / (max - min); 180} 181 182void HTMLMeterElement::didElementStateChange() 183{ 184 m_value->setWidthPercentage(valueRatio()*100); 185 m_value->updatePseudo(); 186 if (RenderMeter* render = renderMeter()) 187 render->updateFromElement(); 188} 189 190RenderMeter* HTMLMeterElement::renderMeter() const 191{ 192 if (renderer() && renderer()->isMeter()) 193 return toRenderMeter(renderer()); 194 195 RenderObject* renderObject = userAgentShadowRoot()->firstChild()->renderer(); 196 return toRenderMeter(renderObject); 197} 198 199void HTMLMeterElement::didAddUserAgentShadowRoot(ShadowRoot& root) 200{ 201 ASSERT(!m_value); 202 203 RefPtrWillBeRawPtr<MeterInnerElement> inner = MeterInnerElement::create(document()); 204 root.appendChild(inner); 205 206 RefPtrWillBeRawPtr<MeterBarElement> bar = MeterBarElement::create(document()); 207 m_value = MeterValueElement::create(document()); 208 m_value->setWidthPercentage(0); 209 m_value->updatePseudo(); 210 bar->appendChild(m_value); 211 212 inner->appendChild(bar); 213} 214 215void HTMLMeterElement::trace(Visitor* visitor) 216{ 217 visitor->trace(m_value); 218 LabelableElement::trace(visitor); 219} 220 221} // namespace 222