wxFont.3erl - Man Page

Functions for wxFont class

Description

A font is an object which determines the appearance of text.

Fonts are used for drawing text to a device context, and setting the appearance of a window's text, see wxDC:setFont/2 and wxWindow:setFont/2.

The easiest way to create a custom font is to use wxFontInfo (not implemented in wx) object to specify the font attributes and then use new/5 constructor. Alternatively, you could start with one of the pre-defined fonts or use wxWindow:getFont/1 and modify the font, e.g. by increasing its size using MakeLarger() (not implemented in wx) or changing its weight using MakeBold() (not implemented in wx).

This class uses reference counting and copy-on-write internally so that assignments between two instances of this class are very cheap. You can therefore use actual objects instead of pointers without efficiency problems. If an instance of this class is changed it will create its own data internally so that other instances, which previously shared the data using the reference counting, are not affected.

You can retrieve the current system font settings with wxSystemSettings.

Predefined objects/pointers: ?wxNullFont, ?wxNORMAL_FONT, ?wxSMALL_FONT, ?wxITALIC_FONT, ?wxSWISS_FONT

See: Overview font, wxDC:setFont/2, wxDC:drawText/3, wxDC:getTextExtent/3, wxFontDialog, wxSystemSettings

wxWidgets docs: wxFont

Data Types

wxFont() = wx:wx_object()

Exports

new() -> wxFont()

Default ctor.

new(NativeInfoString) -> wxFont()
new(Font) -> wxFont()
Types:

Font = wxFont()

Copy constructor, uses reference counting.

new(PointSize, Family, Style, Weight) -> wxFont()
new(PixelSize, Family, Style, Weight) -> wxFont()
Types:

PixelSize = {W :: integer(), H :: integer()}
Family = Style = Weight = wx:wx_enum()

new(PointSize, Family, Style, Weight, Options :: [Option]) ->
       wxFont()
new(PixelSize, Family, Style, Weight, Options :: [Option]) ->
       wxFont()
Types:

PixelSize = {W :: integer(), H :: integer()}
Family = Style = Weight = wx:wx_enum()
Option =
   {underline, boolean()} |
   {faceName, unicode:chardata()} |
   {encoding, wx:wx_enum()}

Creates a font object with the specified attributes and size in pixels.

Notice that the use of this constructor is often more verbose and less readable than the use of constructor from wxFontInfo (not implemented in wx), consider using that constructor instead.

Remark: If the desired font does not exist, the closest match will be chosen. Under Windows, only scalable TrueType fonts are used.

destroy(This :: wxFont()) -> ok

Destructor.

See reference-counted object destruction for more info.

Remark: Although all remaining fonts are deleted when the application exits, the application should try to clean up all fonts itself. This is because wxWidgets cannot know if a pointer to the font object is stored in an application data structure, and there is a risk of double deletion.

isFixedWidth(This) -> boolean()
Types:

This = wxFont()

Returns true if the font is a fixed width (or monospaced) font, false if it is a proportional one or font is invalid.

Note that this function under some platforms is different from just testing for the font family being equal to wxFONTFAMILY_TELETYPE because native platform-specific functions are used for the check (resulting in a more accurate return value).

getDefaultEncoding() -> wx:wx_enum()

Returns the current application's default encoding.

See: Overview fontencoding, setDefaultEncoding/1

getFaceName(This) -> unicode:charlist()
Types:

This = wxFont()

Returns the face name associated with the font, or the empty string if there is no face information.

See: setFaceName/2

getFamily(This) -> wx:wx_enum()
Types:

This = wxFont()

Gets the font family if possible.

As described in ?wxFontFamily docs the returned value acts as a rough, basic classification of the main font properties (look, spacing).

If the current font face name is not recognized by wxFont or by the underlying system, wxFONTFAMILY_DEFAULT is returned.

Note that currently this function is not very precise and so not particularly useful. Font families mostly make sense only for font creation, see setFamily/2.

See: setFamily/2

getNativeFontInfoDesc(This) -> unicode:charlist()
Types:

This = wxFont()

Returns the platform-dependent string completely describing this font.

Returned string is always non-empty unless the font is invalid (in which case an assert is triggered).

Note that the returned string is not meant to be shown or edited by the user: a typical use of this function is for serializing in string-form a wxFont object.

See: SetNativeFontInfo() (not implemented in wx), getNativeFontInfoUserDesc/1

getNativeFontInfoUserDesc(This) -> unicode:charlist()
Types:

This = wxFont()

Returns a user-friendly string for this font object.

Returned string is always non-empty unless the font is invalid (in which case an assert is triggered).

The string does not encode all wxFont infos under all platforms; e.g. under wxMSW the font family is not present in the returned string.

Some examples of the formats of returned strings (which are platform-dependent) are in SetNativeFontInfoUserDesc() (not implemented in wx).

See: SetNativeFontInfoUserDesc() (not implemented in wx), getNativeFontInfoDesc/1

getPointSize(This) -> integer()
Types:

This = wxFont()

Gets the point size as an integer number.

This function is kept for compatibility reasons. New code should use GetFractionalPointSize() (not implemented in wx) and support fractional point sizes.

See: setPointSize/2

See: GetFractionalPointSize() (not implemented in wx)

getStyle(This) -> wx:wx_enum()
Types:

This = wxFont()

Gets the font style.

See ?wxFontStyle for a list of valid styles.

See: setStyle/2

getUnderlined(This) -> boolean()
Types:

This = wxFont()

Returns true if the font is underlined, false otherwise.

See: setUnderlined/2

getWeight(This) -> wx:wx_enum()
Types:

This = wxFont()

Gets the font weight.

See ?wxFontWeight for a list of valid weight identifiers.

See: setWeight/2

ok(This) -> boolean()
Types:

This = wxFont()

See: isOk/1.

isOk(This) -> boolean()
Types:

This = wxFont()

Returns true if this object is a valid font, false otherwise.

setDefaultEncoding(Encoding) -> ok
Types:

Encoding = wx:wx_enum()

Sets the default font encoding.

See: Overview fontencoding, getDefaultEncoding/0

setFaceName(This, FaceName) -> boolean()
Types:

This = wxFont()
FaceName = unicode:chardata()

Sets the facename for the font.

Remark: To avoid portability problems, don't rely on a specific face, but specify the font family instead (see ?wxFontFamily and setFamily/2).

Return: true if the given face name exists; if the face name doesn't exist in the user's system then the font is invalidated (so that isOk/1 will return false) and false is returned.

See: getFaceName/1, setFamily/2

setFamily(This, Family) -> ok
Types:

This = wxFont()
Family = wx:wx_enum()

Sets the font family.

As described in ?wxFontFamily docs the given family value acts as a rough, basic indication of the main font properties (look, spacing).

Note that changing the font family results in changing the font face name.

See: getFamily/1, setFaceName/2

setPointSize(This, PointSize) -> ok
Types:

This = wxFont()
PointSize = integer()

Sets the font size in points to an integer value.

This is a legacy version of the function only supporting integer point sizes. It can still be used, but to avoid unnecessarily restricting the font size in points to integer values, consider using the new (added in wxWidgets 3.1.2) SetFractionalPointSize() (not implemented in wx) function instead.

setStyle(This, Style) -> ok
Types:

This = wxFont()
Style = wx:wx_enum()

Sets the font style.

See: getStyle/1

setUnderlined(This, Underlined) -> ok
Types:

This = wxFont()
Underlined = boolean()

Sets underlining.

See: getUnderlined/1

setWeight(This, Weight) -> ok
Types:

This = wxFont()
Weight = wx:wx_enum()

Sets the font weight.

See: getWeight/1

Info

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