cc81d32f2b
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@18805 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
65 lines
3.4 KiB
TeX
65 lines
3.4 KiB
TeX
\section{wxFont overview}\label{wxfontoverview}
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Class: \helpref{wxFont}{wxfont}, \helpref{wxFontDialog}{wxfontdialog}
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A font is an object which determines the appearance of text, primarily
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when drawing text to a window or device context. A font is determined by
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the following parameters (not all of them have to be specified, of course):
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\begin{twocollist}\itemsep=0pt
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\twocolitem{Point size}{This is the standard way of referring to text size.}
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\twocolitem{Family}{Supported families are:
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{\bf wxDEFAULT, wxDECORATIVE, wxROMAN, wxSCRIPT, wxSWISS, wxMODERN}.
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{\bf wxMODERN} is a fixed pitch font; the others are either fixed or variable pitch.}
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\twocolitem{Style}{The value can be {\bf wxNORMAL, wxSLANT} or {\bf wxITALIC}.}
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\twocolitem{Weight}{The value can be {\bf wxNORMAL, wxLIGHT} or {\bf wxBOLD}.}
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\twocolitem{Underlining}{The value can be true or false.}
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\twocolitem{Face name}{An optional string specifying the actual typeface to be used. If NULL,
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a default typeface will chosen based on the family.}
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\twocolitem{Encoding}{The font encoding (see {\bf wxFONTENCODING\_XXX}
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constants and the \helpref{font overview}{wxfontencodingoverview} for more
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details)}
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\end{twocollist}
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Specifying a family, rather than a specific typeface name, ensures a degree of
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portability across platforms because a suitable font will be chosen for the
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given font family, however it doesn't allow to choose a font precisely as the
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parameters above don't suffice, in general, to identify all the available fonts
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and this is where using the native font descriptions may be helpful - see
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below.
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Under Windows, the face name can be one of the installed fonts on the user's
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system. Since the choice of fonts differs from system to system, either choose
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standard Windows fonts, or if allowing the user to specify a face name, store
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the family name with any file that might be transported to a different Windows
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machine or other platform.
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\normalbox{{\bf Note:} There is currently a difference between the appearance
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of fonts on the two platforms, if the mapping mode is anything other than
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wxMM\_TEXT. Under X, font size is always specified in points. Under MS
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Windows, the unit for text is points but the text is scaled according to the
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current mapping mode. However, user scaling on a device context will also
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scale fonts under both environments.}
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\subsection{Native font information}
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An alternative way of choosing fonts is to use the native font description.
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This is the only acceptable solution if the user is allowed to choose the font
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using the \helpref{wxFontDialog}{wxfontdialog} because the selected font cannot
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be described using only the family name and so, if only family name is stored
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permanently, the user would almost surely see a different font in the program
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later.
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Instead, you should store the value returned by
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\helpref{wxFont::GetNativeFontInfoDesc}{wxfontgetnativefontinfodesc} and pass
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it to \helpref{wxFont::SetNativeFontInfo}{wxfontsetnativefontinfo} later to
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recreate exactly the same font.
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Note that the contents of this string depends on the platform and shouldn't be
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used for any other purpose (in particular, it is not meant to be shown to the
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user). Also please note that although the native font information is currently
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implemented for Windows and Unix (GTK+ and Motif) ports only, all the methods
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are available for all the ports and should be used to make your program work
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correctly when they are implemented later.
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