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 "HTMLNames.h"
26 #include "bindings/v8/ExceptionMessages.h"
27 #include "bindings/v8/ExceptionState.h"
28 #include "bindings/v8/ExceptionStatePlaceholder.h"
29 #include "core/dom/ExceptionCode.h"
30 #include "core/dom/shadow/ShadowRoot.h"
31 #include "core/html/parser/HTMLParserIdioms.h"
32 #include "core/html/shadow/MeterShadowElement.h"
33 #include "core/rendering/RenderMeter.h"
34 #include "core/rendering/RenderTheme.h"
35
36 namespace WebCore {
37
38 using namespace HTMLNames;
39
HTMLMeterElement(Document & document)40 HTMLMeterElement::HTMLMeterElement(Document& document)
41 : LabelableElement(meterTag, document)
42 {
43 ScriptWrappable::init(this);
44 }
45
~HTMLMeterElement()46 HTMLMeterElement::~HTMLMeterElement()
47 {
48 }
49
create(Document & document)50 PassRefPtr<HTMLMeterElement> HTMLMeterElement::create(Document& document)
51 {
52 RefPtr<HTMLMeterElement> meter = adoptRef(new HTMLMeterElement(document));
53 meter->ensureUserAgentShadowRoot();
54 return meter;
55 }
56
createRenderer(RenderStyle * style)57 RenderObject* HTMLMeterElement::createRenderer(RenderStyle* style)
58 {
59 if (hasAuthorShadowRoot() || !RenderTheme::theme().supportsMeter(style->appearance()))
60 return RenderObject::createObject(this, style);
61
62 return new RenderMeter(this);
63 }
64
parseAttribute(const QualifiedName & name,const AtomicString & value)65 void HTMLMeterElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
66 {
67 if (name == valueAttr || name == minAttr || name == maxAttr || name == lowAttr || name == highAttr || name == optimumAttr)
68 didElementStateChange();
69 else
70 LabelableElement::parseAttribute(name, value);
71 }
72
min() const73 double HTMLMeterElement::min() const
74 {
75 return getFloatingPointAttribute(minAttr, 0);
76 }
77
setMin(double min,ExceptionState & exceptionState)78 void HTMLMeterElement::setMin(double min, ExceptionState& exceptionState)
79 {
80 if (!std::isfinite(min)) {
81 exceptionState.throwDOMException(NotSupportedError, ExceptionMessages::notAFiniteNumber(min));
82 return;
83 }
84 setFloatingPointAttribute(minAttr, min);
85 }
86
max() const87 double HTMLMeterElement::max() const
88 {
89 return std::max(getFloatingPointAttribute(maxAttr, std::max(1.0, min())), min());
90 }
91
setMax(double max,ExceptionState & exceptionState)92 void HTMLMeterElement::setMax(double max, ExceptionState& exceptionState)
93 {
94 if (!std::isfinite(max)) {
95 exceptionState.throwDOMException(NotSupportedError, ExceptionMessages::notAFiniteNumber(max));
96 return;
97 }
98 setFloatingPointAttribute(maxAttr, max);
99 }
100
value() const101 double HTMLMeterElement::value() const
102 {
103 double value = getFloatingPointAttribute(valueAttr, 0);
104 return std::min(std::max(value, min()), max());
105 }
106
setValue(double value,ExceptionState & exceptionState)107 void HTMLMeterElement::setValue(double value, ExceptionState& exceptionState)
108 {
109 if (!std::isfinite(value)) {
110 exceptionState.throwDOMException(NotSupportedError, ExceptionMessages::notAFiniteNumber(value));
111 return;
112 }
113 setFloatingPointAttribute(valueAttr, value);
114 }
115
low() const116 double HTMLMeterElement::low() const
117 {
118 double low = getFloatingPointAttribute(lowAttr, min());
119 return std::min(std::max(low, min()), max());
120 }
121
setLow(double low,ExceptionState & exceptionState)122 void HTMLMeterElement::setLow(double low, ExceptionState& exceptionState)
123 {
124 if (!std::isfinite(low)) {
125 exceptionState.throwDOMException(NotSupportedError, ExceptionMessages::notAFiniteNumber(low));
126 return;
127 }
128 setFloatingPointAttribute(lowAttr, low);
129 }
130
high() const131 double HTMLMeterElement::high() const
132 {
133 double high = getFloatingPointAttribute(highAttr, max());
134 return std::min(std::max(high, low()), max());
135 }
136
setHigh(double high,ExceptionState & exceptionState)137 void HTMLMeterElement::setHigh(double high, ExceptionState& exceptionState)
138 {
139 if (!std::isfinite(high)) {
140 exceptionState.throwDOMException(NotSupportedError, ExceptionMessages::notAFiniteNumber(high));
141 return;
142 }
143 setFloatingPointAttribute(highAttr, high);
144 }
145
optimum() const146 double HTMLMeterElement::optimum() const
147 {
148 double optimum = getFloatingPointAttribute(optimumAttr, (max() + min()) / 2);
149 return std::min(std::max(optimum, min()), max());
150 }
151
setOptimum(double optimum,ExceptionState & exceptionState)152 void HTMLMeterElement::setOptimum(double optimum, ExceptionState& exceptionState)
153 {
154 if (!std::isfinite(optimum)) {
155 exceptionState.throwDOMException(NotSupportedError, ExceptionMessages::notAFiniteNumber(optimum));
156 return;
157 }
158 setFloatingPointAttribute(optimumAttr, optimum);
159 }
160
gaugeRegion() const161 HTMLMeterElement::GaugeRegion HTMLMeterElement::gaugeRegion() const
162 {
163 double lowValue = low();
164 double highValue = high();
165 double theValue = value();
166 double optimumValue = optimum();
167
168 if (optimumValue < lowValue) {
169 // The optimum range stays under low
170 if (theValue <= lowValue)
171 return GaugeRegionOptimum;
172 if (theValue <= highValue)
173 return GaugeRegionSuboptimal;
174 return GaugeRegionEvenLessGood;
175 }
176
177 if (highValue < optimumValue) {
178 // The optimum range stays over high
179 if (highValue <= theValue)
180 return GaugeRegionOptimum;
181 if (lowValue <= theValue)
182 return GaugeRegionSuboptimal;
183 return GaugeRegionEvenLessGood;
184 }
185
186 // The optimum range stays between high and low.
187 // According to the standard, <meter> never show GaugeRegionEvenLessGood in this case
188 // because the value is never less or greater than min or max.
189 if (lowValue <= theValue && theValue <= highValue)
190 return GaugeRegionOptimum;
191 return GaugeRegionSuboptimal;
192 }
193
valueRatio() const194 double HTMLMeterElement::valueRatio() const
195 {
196 double min = this->min();
197 double max = this->max();
198 double value = this->value();
199
200 if (max <= min)
201 return 0;
202 return (value - min) / (max - min);
203 }
204
didElementStateChange()205 void HTMLMeterElement::didElementStateChange()
206 {
207 m_value->setWidthPercentage(valueRatio()*100);
208 m_value->updatePseudo();
209 if (RenderMeter* render = renderMeter())
210 render->updateFromElement();
211 }
212
renderMeter() const213 RenderMeter* HTMLMeterElement::renderMeter() const
214 {
215 if (renderer() && renderer()->isMeter())
216 return toRenderMeter(renderer());
217
218 RenderObject* renderObject = userAgentShadowRoot()->firstChild()->renderer();
219 return toRenderMeter(renderObject);
220 }
221
didAddUserAgentShadowRoot(ShadowRoot & root)222 void HTMLMeterElement::didAddUserAgentShadowRoot(ShadowRoot& root)
223 {
224 ASSERT(!m_value);
225
226 RefPtr<MeterInnerElement> inner = MeterInnerElement::create(document());
227 root.appendChild(inner);
228
229 RefPtr<MeterBarElement> bar = MeterBarElement::create(document());
230 m_value = MeterValueElement::create(document());
231 m_value->setWidthPercentage(0);
232 m_value->updatePseudo();
233 bar->appendChild(m_value);
234
235 inner->appendChild(bar);
236 }
237
238 } // namespace
239