本文整理汇总了C++中nsCSSValue::IsLengthUnit方法的典型用法代码示例。如果您正苦于以下问题：C++ nsCSSValue::IsLengthUnit方法的具体用法？C++ nsCSSValue::IsLengthUnit怎么用？C++ nsCSSValue::IsLengthUnit使用的例子？那么恭喜您, 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nsCSSValue的用法示例。
在下文中一共展示了nsCSSValue::IsLengthUnit方法的3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: NSToCoordRound
/* static */ nscoord
nsMathMLFrame::CalcLength(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
const nsCSSValue& aCSSValue,
float aFontSizeInflation)
{
NS_ASSERTION(aCSSValue.IsLengthUnit(), "not a length unit");
if (aCSSValue.IsFixedLengthUnit()) {
return aCSSValue.GetFixedLength(aPresContext);
}
if (aCSSValue.IsPixelLengthUnit()) {
return aCSSValue.GetPixelLength();
}
nsCSSUnit unit = aCSSValue.GetUnit();
if (eCSSUnit_EM == unit) {
const nsStyleFont* font = aStyleContext->StyleFont();
return NSToCoordRound(aCSSValue.GetFloatValue() * (float)font->mFont.size);
}
else if (eCSSUnit_XHeight == unit) {
aPresContext->SetUsesExChUnits(true);
RefPtr<nsFontMetrics> fm = nsLayoutUtils::
GetFontMetricsForStyleContext(aStyleContext, aFontSizeInflation);
nscoord xHeight = fm->XHeight();
return NSToCoordRound(aCSSValue.GetFloatValue() * (float)xHeight);
}
// MathML doesn't specify other CSS units such as rem or ch
NS_ERROR("Unsupported unit");
return 0;
}示例2: NSFloatPixelsToTwips
/* static */ nscoord
nsMathMLFrame::CalcLength(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
const nsCSSValue& aCSSValue)
{
NS_ASSERTION(aCSSValue.IsLengthUnit(), "not a length unit");
if (aCSSValue.IsFixedLengthUnit()) {
return aCSSValue.GetLengthTwips();
}
nsCSSUnit unit = aCSSValue.GetUnit();
if (eCSSUnit_Pixel == unit) {
return NSFloatPixelsToTwips(aCSSValue.GetFloatValue(),
aPresContext->ScaledPixelsToTwips());
}
else if (eCSSUnit_EM == unit) {
const nsStyleFont* font = aStyleContext->GetStyleFont();
return NSToCoordRound(aCSSValue.GetFloatValue() * (float)font->mFont.size);
}
else if (eCSSUnit_XHeight == unit) {
nscoord xHeight;
const nsStyleFont* font = aStyleContext->GetStyleFont();
nsCOMPtr<nsIFontMetrics> fm = aPresContext->GetMetricsFor(font->mFont);
fm->GetXHeight(xHeight);
return NSToCoordRound(aCSSValue.GetFloatValue() * (float)xHeight);
}
return 0;
}示例3: if
/* static */ PRBool
nsMathMLFrame::ParseNamedSpaceValue(nsIFrame* aMathMLmstyleFrame,
nsString& aString,
nsCSSValue& aCSSValue)
{
aCSSValue.Reset();
aString.CompressWhitespace(); // aString is not a const in this code...
if (!aString.Length()) return PR_FALSE;
// See if it is one of the 'namedspace' (ranging 1/18em...7/18em)
PRInt32 i = 0;
nsIAtom* namedspaceAtom = nsnull;
if (aString.EqualsLiteral("veryverythinmathspace")) {
i = 1;
namedspaceAtom = nsMathMLAtoms::veryverythinmathspace_;
}
else if (aString.EqualsLiteral("verythinmathspace")) {
i = 2;
namedspaceAtom = nsMathMLAtoms::verythinmathspace_;
}
else if (aString.EqualsLiteral("thinmathspace")) {
i = 3;
namedspaceAtom = nsMathMLAtoms::thinmathspace_;
}
else if (aString.EqualsLiteral("mediummathspace")) {
i = 4;
namedspaceAtom = nsMathMLAtoms::mediummathspace_;
}
else if (aString.EqualsLiteral("thickmathspace")) {
i = 5;
namedspaceAtom = nsMathMLAtoms::thickmathspace_;
}
else if (aString.EqualsLiteral("verythickmathspace")) {
i = 6;
namedspaceAtom = nsMathMLAtoms::verythickmathspace_;
}
else if (aString.EqualsLiteral("veryverythickmathspace")) {
i = 7;
namedspaceAtom = nsMathMLAtoms::veryverythickmathspace_;
}
if (0 != i) {
if (aMathMLmstyleFrame) {
// see if there is a <mstyle> that has overriden the default value
// GetAttribute() will recurse all the way up into the <mstyle> hierarchy
nsAutoString value;
if (NS_CONTENT_ATTR_HAS_VALUE ==
GetAttribute(nsnull, aMathMLmstyleFrame, namedspaceAtom, value)) {
if (ParseNumericValue(value, aCSSValue) &&
aCSSValue.IsLengthUnit()) {
return PR_TRUE;
}
}
}
// fall back to the default value
aCSSValue.SetFloatValue(float(i)/float(18), eCSSUnit_EM);
return PR_TRUE;
}
return PR_FALSE;
}