bool RenderTheme::paintMeter(RenderObject* renderObject, const RenderObject::PaintInfo& paintInfo, const IntRect& rect)
{
// Some platforms do not have a native gauge widget, so we draw here a default implementation.
RenderMeter* renderMeter = toRenderMeter(renderObject);
RenderStyle* style = renderObject->style();
int left = style->borderLeft().width() + style->paddingLeft().value();
int top = style->borderTop().width() + style->paddingTop().value();
int right = style->borderRight().width() + style->paddingRight().value();
int bottom = style->borderBottom().width() + style->paddingBottom().value();
FloatRect innerRect(rect.x() + left, rect.y() + top, rect.width() - left - right, rect.height() - top - bottom);
HTMLMeterElement* element = static_cast<HTMLMeterElement*>(renderMeter->node());
double min = element->min();
double max = element->max();
double value = element->value();
if (min >= max) {
paintInfo.context->fillRect(innerRect, Color::black, style->colorSpace());
return false;
}
// Paint the background first
paintInfo.context->fillRect(innerRect, Color::lightGray, style->colorSpace());
FloatRect valueRect;
if (rect.width() < rect.height()) {
// Vertical gauge
double scale = innerRect.height() / (max - min);
valueRect.setLocation(FloatPoint(innerRect.x(), innerRect.y() + narrowPrecisionToFloat((max - value) * scale)));
valueRect.setSize(FloatSize(innerRect.width(), narrowPrecisionToFloat((value - min) * scale)));
} else if (renderMeter->style()->direction() == RTL) {
// right to left horizontal gauge
double scale = innerRect.width() / (max - min);
valueRect.setLocation(FloatPoint(innerRect.x() + narrowPrecisionToFloat((max - value) * scale), innerRect.y()));
valueRect.setSize(FloatSize(narrowPrecisionToFloat((value - min) * scale), innerRect.height()));
} else {
// left to right horizontal gauge
double scale = innerRect.width() / (max - min);
valueRect.setLocation(innerRect.location());
valueRect.setSize(FloatSize(narrowPrecisionToFloat((value - min)) * scale, innerRect.height()));
}
if (!valueRect.isEmpty())
paintInfo.context->fillRect(valueRect, Color::black, style->colorSpace());
return false;
}
bool MeterShadowElement::rendererIsNeeded(const NodeRenderingContext& context)
{
RenderMeter* meterRenderer = toRenderMeter(meterElement()->renderer());
return meterRenderer && !meterRenderer->theme()->supportsMeter(meterRenderer->style()->appearance()) && HTMLDivElement::rendererIsNeeded(context);
}