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1 | \section{wxFont overview}\label{wxfontoverview} | |
2 | ||
3 | Class: \helpref{wxFont}{wxfont}, \helpref{wxFontDialog}{wxfontdialog} | |
4 | ||
5 | A font is an object which determines the appearance of text, primarily | |
6 | when drawing text to a window or device context. A font is determined by | |
7 | the following parameters (not all of them have to be specified, of course): | |
8 | ||
9 | \begin{twocollist}\itemsep=0pt | |
10 | \twocolitem{Point size}{This is the standard way of referring to text size.} | |
11 | \twocolitem{Family}{Supported families are: | |
12 | {\bf wxDEFAULT, wxDECORATIVE, wxROMAN, wxSCRIPT, wxSWISS, wxMODERN}. | |
13 | {\bf wxMODERN} is a fixed pitch font; the others are either fixed or variable pitch.} | |
14 | \twocolitem{Style}{The value can be {\bf wxNORMAL, wxSLANT} or {\bf wxITALIC}.} | |
15 | \twocolitem{Weight}{The value can be {\bf wxNORMAL, wxLIGHT} or {\bf wxBOLD}.} | |
16 | \twocolitem{Underlining}{The value can be TRUE or FALSE.} | |
17 | \twocolitem{Face name}{An optional string specifying the actual typeface to be used. If NULL, | |
18 | a default typeface will chosen based on the family.} | |
19 | \twocolitem{Encoding}{The font encoding (see {\bf wxFONTENCODING\_XXX} | |
20 | constants and the \helpref{font overview}{wxfontencodingoverview} for more | |
21 | details)} | |
22 | \end{twocollist} | |
23 | ||
24 | Specifying a family, rather than a specific typeface name, ensures a degree of | |
25 | portability across platforms because a suitable font will be chosen for the | |
26 | given font family, however it doesn't allow to choose a font precisely as the | |
27 | parameters above don't suffice, in general, to identify all the available fonts | |
28 | and this is where using the native font descriptions may be helpful - see | |
29 | below. | |
30 | ||
31 | Under Windows, the face name can be one of the installed fonts on the user's | |
32 | system. Since the choice of fonts differs from system to system, either choose | |
33 | standard Windows fonts, or if allowing the user to specify a face name, store | |
34 | the family name with any file that might be transported to a different Windows | |
35 | machine or other platform. | |
36 | ||
37 | \normalbox{{\bf Note:} There is currently a difference between the appearance | |
38 | of fonts on the two platforms, if the mapping mode is anything other than | |
39 | wxMM\_TEXT. Under X, font size is always specified in points. Under MS | |
40 | Windows, the unit for text is points but the text is scaled according to the | |
41 | current mapping mode. However, user scaling on a device context will also | |
42 | scale fonts under both environments.} | |
43 | ||
44 | \subsection{Native font information} | |
45 | ||
46 | An alternative way of choosing fonts is to use the native font description. | |
47 | This is the only acceptable solution if the user is allowed to choose the font | |
48 | using the \helpref{wxFontDialog}{wxfontdialog} because the selected font cannot | |
49 | be described using only the family name and so, if only family name is stored | |
50 | permanently, the user would almost surely see a different font in the program | |
51 | later. | |
52 | ||
53 | Instead, you should store the value returned by | |
54 | \helpref{wxFont::GetNativeFontInfoDesc}{wxfontgetnativefontinfodesc} and pass | |
55 | it to \helpref{wxFont::SetNativeFontInfo}{wxfontsetnativefontinfo} later to | |
56 | recreate exactly the same font. | |
57 | ||
58 | Note that the contents of this string depends on the platform and shouldn't be | |
59 | used for any other purpose (in particular, it is not meant to be shown to the | |
60 | user). Also please note that although the native font information is currently | |
61 | implemented for Windows and Unix (GTK+ and Motif) ports only, all the methods | |
62 | are available for all the ports and should be used to make your program work | |
63 | correctly when they are implemented later. | |
64 |