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
37 namespace blink {
38
39 using namespace HTMLNames;
40
HTMLMeterElement(Document & document)41 HTMLMeterElement::HTMLMeterElement(Document& document)
42 : LabelableElement(meterTag, document)
43 {
44 UseCounter::count(document, UseCounter::MeterElement);
45 }
46
~HTMLMeterElement()47 HTMLMeterElement::~HTMLMeterElement()
48 {
49 }
50
create(Document & document)51 PassRefPtrWillBeRawPtr<HTMLMeterElement> HTMLMeterElement::create(Document& document)
52 {
53 RefPtrWillBeRawPtr<HTMLMeterElement> meter = adoptRefWillBeNoop(new HTMLMeterElement(document));
54 meter->ensureUserAgentShadowRoot();
55 return meter.release();
56 }
57
createRenderer(RenderStyle * style)58 RenderObject* 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
parseAttribute(const QualifiedName & name,const AtomicString & value)66 void 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
value() const74 double HTMLMeterElement::value() const
75 {
76 double value = getFloatingPointAttribute(valueAttr, 0);
77 return std::min(std::max(value, min()), max());
78 }
79
setValue(double value)80 void HTMLMeterElement::setValue(double value)
81 {
82 setFloatingPointAttribute(valueAttr, value);
83 }
84
min() const85 double HTMLMeterElement::min() const
86 {
87 return getFloatingPointAttribute(minAttr, 0);
88 }
89
setMin(double min)90 void HTMLMeterElement::setMin(double min)
91 {
92 setFloatingPointAttribute(minAttr, min);
93 }
94
max() const95 double HTMLMeterElement::max() const
96 {
97 return std::max(getFloatingPointAttribute(maxAttr, std::max(1.0, min())), min());
98 }
99
setMax(double max)100 void HTMLMeterElement::setMax(double max)
101 {
102 setFloatingPointAttribute(maxAttr, max);
103 }
104
low() const105 double HTMLMeterElement::low() const
106 {
107 double low = getFloatingPointAttribute(lowAttr, min());
108 return std::min(std::max(low, min()), max());
109 }
110
setLow(double low)111 void HTMLMeterElement::setLow(double low)
112 {
113 setFloatingPointAttribute(lowAttr, low);
114 }
115
high() const116 double HTMLMeterElement::high() const
117 {
118 double high = getFloatingPointAttribute(highAttr, max());
119 return std::min(std::max(high, low()), max());
120 }
121
setHigh(double high)122 void HTMLMeterElement::setHigh(double high)
123 {
124 setFloatingPointAttribute(highAttr, high);
125 }
126
optimum() const127 double HTMLMeterElement::optimum() const
128 {
129 double optimum = getFloatingPointAttribute(optimumAttr, (max() + min()) / 2);
130 return std::min(std::max(optimum, min()), max());
131 }
132
setOptimum(double optimum)133 void HTMLMeterElement::setOptimum(double optimum)
134 {
135 setFloatingPointAttribute(optimumAttr, optimum);
136 }
137
gaugeRegion() const138 HTMLMeterElement::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
valueRatio() const171 double 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
didElementStateChange()182 void HTMLMeterElement::didElementStateChange()
183 {
184 m_value->setWidthPercentage(valueRatio()*100);
185 m_value->updatePseudo();
186 if (RenderMeter* render = renderMeter())
187 render->updateFromElement();
188 }
189
renderMeter() const190 RenderMeter* 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
didAddUserAgentShadowRoot(ShadowRoot & root)199 void 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
trace(Visitor * visitor)215 void HTMLMeterElement::trace(Visitor* visitor)
216 {
217 visitor->trace(m_value);
218 LabelableElement::trace(visitor);
219 }
220
221 } // namespace
222