本文整理汇总了C++中MediaValues::printMediaType方法的典型用法代码示例。如果您正苦于以下问题：C++ MediaValues::printMediaType方法的具体用法？C++ MediaValues::printMediaType怎么用？C++ MediaValues::printMediaType使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类MediaValues的用法示例。
在下文中一共展示了MediaValues::printMediaType方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: evalResolution
static bool evalResolution(const MediaQueryExpValue& value, MediaFeaturePrefix op, const MediaValues& mediaValues)
{
// According to MQ4, only 'screen', 'print' and 'speech' may match.
// FIXME: What should speech match? https://www.w3.org/Style/CSS/Tracker/issues/348
float actualResolution = 0;
// This checks the actual media type applied to the document, and we know
// this method only got called if this media type matches the one defined
// in the query. Thus, if if the document's media type is "print", the
// media type of the query will either be "print" or "all".
if (mediaValues.screenMediaType()) {
actualResolution = clampTo<float>(mediaValues.devicePixelRatio());
} else if (mediaValues.printMediaType()) {
// The resolution of images while printing should not depend on the DPI
// of the screen. Until we support proper ways of querying this info
// we use 300px which is considered minimum for current printers.
actualResolution = 300 / cssPixelsPerInch;
}
if (!value.isValid())
return !!actualResolution;
if (!value.isValue)
return false;
if (value.unit == CSSPrimitiveValue::CSS_NUMBER)
return compareValue(actualResolution, clampTo<float>(value.value), op);
if (!CSSPrimitiveValue::isResolution(value.unit))
return false;
double canonicalFactor = CSSPrimitiveValue::conversionToCanonicalUnitsScaleFactor(value.unit);
double dppxFactor = CSSPrimitiveValue::conversionToCanonicalUnitsScaleFactor(CSSPrimitiveValue::CSS_DPPX);
float valueInDppx = clampTo<float>(value.value * (canonicalFactor / dppxFactor));
if (CSSPrimitiveValue::isDotsPerCentimeter(value.unit)) {
// To match DPCM to DPPX values, we limit to 2 decimal points.
// The http://dev.w3.org/csswg/css3-values/#absolute-lengths recommends
// "that the pixel unit refer to the whole number of device pixels that best
// approximates the reference pixel". With that in mind, allowing 2 decimal
// point precision seems appropriate.
return compareValue(
floorf(0.5 + 100 * actualResolution) / 100,
floorf(0.5 + 100 * valueInDppx) / 100, op);
}
return compareValue(actualResolution, valueInDppx, op);
}