Serializable
The
TextAttribute
class defines attribute keys and attribute values used for text rendering.
TextAttribute instances are used as attribute keys to identify attributes in Font, TextLayout, AttributedCharacterIterator, and other classes handling text attributes. Other constants defined in this class can be used as attribute values.
For each text attribute, the documentation provides:
null is treated the same as the default value and results in the default behavior.TextAttribute.WEIGHT_BOLD and Float.valueOf(2.0f) indicate the same WEIGHT.Number (used for WEIGHT, WIDTH, POSTURE, SIZE, JUSTIFICATION, and TRACKING) can vary along their natural range and are not restricted to the predefined constants. Number.floatValue() is used to get the actual value from the Number.WEIGHT, WIDTH, and POSTURE are interpolated by the system, which can select the 'nearest available' font or use other techniques to approximate the user's request.FAMILY String See Font DIALOG, DIALOG_INPUT,
SERIF, SANS_SERIF, and MONOSPACED. "Default" (use platform default) WEIGHT Number WEIGHT_REGULAR, WEIGHT_BOLD WEIGHT_REGULAR WIDTH Number WIDTH_CONDENSED, WIDTH_REGULAR,
POSTURE Number POSTURE_REGULAR, POSTURE_OBLIQUE POSTURE_REGULAR SIZE Number none 12.0 TRANSFORM TransformAttribute See TransformAttribute IDENTITY TransformAttribute.IDENTITY SUPERSCRIPT Integer SUPERSCRIPT_SUPER, SUPERSCRIPT_SUB 0 (use the standard glyphs and metrics) FONT Font none null (do not override font resolution) CHAR_REPLACEMENT GraphicAttribute none null (draw text using font glyphs) FOREGROUND Paint none null (use current graphics paint) BACKGROUND Paint none null (do not render background) UNDERLINE Integer UNDERLINE_ON -1 (do not render underline) STRIKETHROUGH Boolean STRIKETHROUGH_ON false (do not render strikethrough) RUN_DIRECTION Boolean RUN_DIRECTION_LTR
Bidi standard default) BIDI_EMBEDDING Integer none 0 (use base line direction) JUSTIFICATION Number JUSTIFICATION_FULL JUSTIFICATION_FULL INPUT_METHOD_HIGHLIGHT InputMethodHighlight,
Annotation (see class) null (do not apply input highlighting) INPUT_METHOD_UNDERLINE Integer UNDERLINE_LOW_ONE_PIXEL,
SWAP_COLORS Boolean SWAP_COLORS_ON false (do not swap colors) NUMERIC_SHAPING NumericShaper none null (do not shape digits) KERNING Integer KERNING_ON 0 (do not request kerning) LIGATURES Integer LIGATURES_ON 0 (do not form optional ligatures) TRACKING Number TRACKING_LOOSE, TRACKING_TIGHT 0 (do not add tracking)
Fields
Attribute key for the paint used to render the background of the text.
Attribute key for the embedding level of the text.
Attribute key for a user-defined glyph to display in lieu of the font's standard glyph for a character.
Attribute key for the font name.
Attribute key used to provide the font to use to render text.
Attribute key for the paint used to render the text.
Attribute key for input method highlight styles.
Attribute key for input method underlines.
Attribute key for the justification of a paragraph.
Justify the line to the full requested width.
Do not allow the line to be justified.
Attribute key to request kerning.
Request standard kerning.
Attribute key for enabling optional ligatures.
Request standard optional ligatures.
Attribute key for converting ASCII decimal digits to other decimal ranges.
Attribute key for the posture of a font.
The standard italic posture.
The standard posture, upright.
Attribute key for the run direction of the line.
Left-to-right run direction.
Right-to-left run direction.
Attribute key for the font size.
Attribute key for strikethrough.
Attribute key for superscripting and subscripting.
Attribute key for swapping foreground and background Paints.
Swap foreground and background.
Attribute key to control tracking.
Attribute key for the transform of a font.
Attribute key for underline.
Single pixel dashed low underline.
Single pixel dotted low underline.
Double pixel gray low underline.
Single pixel solid low underline.
Double pixel solid low underline.
Attribute key for the weight of a font.
The standard bold weight.
A moderately lighter weight than WEIGHT_BOLD.
An intermediate weight between WEIGHT_LIGHT and WEIGHT_STANDARD.
The lightest predefined weight.
A moderately heavier weight than WEIGHT_BOLD.
The standard light weight.
An intermediate weight between WEIGHT_REGULAR and WEIGHT_BOLD.
A moderately heavier weight than WEIGHT_REGULAR.
The heaviest predefined weight.
Attribute key for the width of a font.
The most condensed predefined width.
The most extended predefined width.
A moderately condensed width.
A moderately extended width.
Constructors
protected
Constructs a TextAttribute with the specified name.
Resolves instances being deserialized to the predefined constants.
Attribute key for the font name. Values are instances of
String
. The default value is
"Default"
, which causes the platform default font family to be used.
The Font class defines constants for the logical font names DIALOG, DIALOG_INPUT, SANS_SERIF, SERIF, and MONOSPACED.
This defines the value passed as name to the Font constructor. Both logical and physical font names are allowed. If a font with the requested name is not found, the default font is used.
Note: This attribute is unfortunately misnamed, as it specifies the face name and not just the family. Thus values such as "Lucida Sans Bold" will select that face if it exists. Note, though, that if the requested face does not exist, the default will be used with regular weight. The "Bold" in the name is part of the face name, not a separate request that the font's weight be bold.
Attribute key for the weight of a font. Values are instances of
Number
. The default value is
WEIGHT_REGULAR
.
Several constant values are provided, see WEIGHT_EXTRA_LIGHT, WEIGHT_LIGHT, WEIGHT_DEMILIGHT, WEIGHT_REGULAR, WEIGHT_SEMIBOLD, WEIGHT_MEDIUM, WEIGHT_DEMIBOLD, WEIGHT_BOLD, WEIGHT_HEAVY, WEIGHT_EXTRABOLD, and WEIGHT_ULTRABOLD. The value WEIGHT_BOLD corresponds to the style value Font.BOLD as passed to the Font constructor.
The value is roughly the ratio of the stem width to that of the regular weight.
The system can interpolate the provided value.
The standard light weight.
An intermediate weight between WEIGHT_LIGHT and WEIGHT_STANDARD.
The standard weight. This is the default value for WEIGHT.
A moderately heavier weight than WEIGHT_REGULAR.
An intermediate weight between WEIGHT_REGULAR and WEIGHT_BOLD.
A moderately lighter weight than WEIGHT_BOLD.
The standard bold weight.
A moderately heavier weight than WEIGHT_BOLD.
The heaviest predefined weight.
The most condensed predefined width.
A moderately condensed width.
The standard width. This is the default value for WIDTH.
A moderately extended width.
The most extended predefined width.
Attribute key for the posture of a font. Values are instances of
Number
. The default value is
POSTURE_REGULAR
.
Two constant values are provided, POSTURE_REGULAR and POSTURE_OBLIQUE. The value POSTURE_OBLIQUE corresponds to the style value Font.ITALIC as passed to the Font constructor.
The value is roughly the slope of the stems of the font, expressed as the run over the rise. Positive values lean right.
The system can interpolate the provided value.
This will affect the font's italic angle as returned by Font.getItalicAngle.
The standard posture, upright. This is the default value for POSTURE.
The standard italic posture.
Attribute key for the font size. Values are instances of
Number
. The default value is 12pt.
This corresponds to the size parameter to the Font constructor.
Very large or small sizes will impact rendering performance, and the rendering system might not render text at these sizes. Negative sizes are illegal and result in the default size.
Note that the appearance and metrics of a 12pt font with a 2x transform might be different than that of a 24 point font with no transform.
Attribute key for the transform of a font. Values are instances of
TransformAttribute
. The default value is
TransformAttribute.IDENTITY
.
The TransformAttribute class defines the constant IDENTITY.
This corresponds to the transform passed to Font.deriveFont(AffineTransform). Since that transform is mutable and TextAttribute values must not be, the TransformAttribute wrapper class is used.
The primary intent is to support scaling and skewing, though other effects are possible.
Some transforms will cause the baseline to be rotated and/or shifted. The text and the baseline are transformed together so that the text follows the new baseline. For example, with text on a horizontal baseline, the new baseline follows the direction of the unit x vector passed through the transform. Text metrics are measured against this new baseline. So, for example, with other things being equal, text rendered with a rotated TRANSFORM and an unrotated TRANSFORM will measure as having the same ascent, descent, and advance.
In styled text, the baselines for each such run are aligned one after the other to potentially create a non-linear baseline for the entire run of text. For more information, see TextLayout.getLayoutPath().
Attribute key for superscripting and subscripting. Values are instances of
Integer
. The default value is 0, which means that no superscript or subscript is used.
Two constant values are provided, see SUPERSCRIPT_SUPER and SUPERSCRIPT_SUB. These have the values 1 and -1 respectively. Values of greater magnitude define greater levels of superscript or subscripting, for example, 2 corresponds to super-superscript, 3 to super-super-superscript, and similarly for negative values and subscript, up to a level of 7 (or -7). Values beyond this range are reserved; behavior is platform-dependent.
SUPERSCRIPT can impact the ascent and descent of a font. The ascent and descent can never become negative, however.
Standard superscript.
Standard subscript.
Attribute key used to provide the font to use to render text. Values are instances of
Font
. The default value is null, indicating that normal resolution of a
Font
from attributes should be performed.
TextLayout and AttributedCharacterIterator work in terms of Maps of TextAttributes. Normally, all the attributes are examined and used to select and configure a Font instance. If a FONT attribute is present, though, its associated Font will be used. This provides a way for users to override the resolution of font attributes into a Font, or force use of a particular Font instance. This also allows users to specify subclasses of Font in cases where a Font can be subclassed.
FONT is used for special situations where clients already have a Font instance but still need to use Map-based APIs. Typically, there will be no other attributes in the Map except the FONT attribute. With Map-based APIs the common case is to specify all attributes individually, so FONT is not needed or desirable.
However, if both FONT and other attributes are present in the Map, the rendering system will merge the attributes defined in the Font with the additional attributes. This merging process classifies TextAttributes into two groups. One group, the 'primary' group, is considered fundamental to the selection and metric behavior of a font. These attributes are FAMILY, WEIGHT, WIDTH, POSTURE, SIZE, TRANSFORM, SUPERSCRIPT, and TRACKING. The other group, the 'secondary' group, consists of all other defined attributes, with the exception of FONT itself.
To generate the new Map, first the Font is obtained from the FONT attribute, and all of its attributes extracted into a new Map. Then only the secondary attributes from the original Map are added to those in the new Map. Thus the values of primary attributes come solely from the Font, and the values of secondary attributes originate with the Font but can be overridden by other values in the Map.
Note:Font's Map-based constructor and deriveFont methods do not process the FONT attribute, as these are used to create new Font objects. Instead, Font.getFont(Map) should be used to handle the FONT attribute.
Attribute key for a user-defined glyph to display in lieu of the font's standard glyph for a character. Values are instances of GraphicAttribute. The default value is null, indicating that the standard glyphs provided by the font should be used.
This attribute is used to reserve space for a graphic or other component embedded in a line of text. It is required for correct positioning of 'inline' components within a line when bidirectional reordering (see Bidi) is performed. Each character (Unicode code point) will be rendered using the provided GraphicAttribute. Typically, the characters to which this attribute is applied should be \uFFFC.
The GraphicAttribute determines the logical and visual bounds of the text; the actual Font values are ignored.
Attribute key for the paint used to render the text. Values are instances of
Paint
. The default value is null, indicating that the
Paint
set on the
Graphics2D
at the time of rendering is used.
Glyphs will be rendered using this Paint regardless of the Paint value set on the Graphics (but see SWAP_COLORS).
Attribute key for the paint used to render the background of the text. Values are instances of
Paint
. The default value is null, indicating that the background should not be rendered.
The logical bounds of the text will be filled using this Paint, and then the text will be rendered on top of it (but see SWAP_COLORS).
The visual bounds of the text is extended to include the logical bounds, if necessary. The outline is not affected.
Attribute key for underline. Values are instances of
Integer
. The default value is -1, which means no underline.
The constant value UNDERLINE_ON is provided.
The underline affects both the visual bounds and the outline of the text.
Standard underline.
Attribute key for strikethrough. Values are instances of
Boolean
. The default value is
false
, which means no strikethrough.
The constant value STRIKETHROUGH_ON is provided.
The strikethrough affects both the visual bounds and the outline of the text.
A single strikethrough.
Attribute key for the run direction of the line. Values are instances of
Boolean
. The default value is null, which indicates that the standard Bidi algorithm for determining run direction should be used with the value
Bidi.DIRECTION_DEFAULT_LEFT_TO_RIGHT
.
The constants RUN_DIRECTION_RTL and RUN_DIRECTION_LTR are provided.
This determines the value passed to the Bidi constructor to select the primary direction of the text in the paragraph.
Note: This attribute should have the same value for all the text in a paragraph, otherwise the behavior is undetermined.
Left-to-right run direction.
Right-to-left run direction.
Attribute key for the embedding level of the text. Values are instances of
Integer
. The default value is
null
, indicating that the Bidirectional algorithm should run without explicit embeddings.
Positive values 1 through 61 are embedding levels, negative values -1 through -61 are override levels. The value 0 means that the base line direction is used. These levels are passed in the embedding levels array to the Bidi constructor.
Note: When this attribute is present anywhere in a paragraph, then any Unicode bidi control characters (RLO, LRO, RLE, LRE, and PDF) in the paragraph are disregarded, and runs of text where this attribute is not present are treated as though it were present and had the value 0.
Attribute key for the justification of a paragraph. Values are instances of
Number
. The default value is 1, indicating that justification should use the full width provided. Values are pinned to the range [0..1].
The constants JUSTIFICATION_FULL and JUSTIFICATION_NONE are provided.
Specifies the fraction of the extra space to use when justification is requested on a TextLayout. For example, if the line is 50 points wide and it is requested to justify to 70 points, a value of 0.75 will pad to use three-quarters of the remaining space, or 15 points, so that the resulting line will be 65 points in length.
Note: This should have the same value for all the text in a paragraph, otherwise the behavior is undetermined.
Justify the line to the full requested width. This is the default value for JUSTIFICATION.
Do not allow the line to be justified.
Attribute key for input method highlight styles.
Values are instances of InputMethodHighlight or Annotation. The default value is null, which means that input method styles should not be applied before rendering.
If adjacent runs of text with the same InputMethodHighlight need to be rendered separately, the InputMethodHighlights should be wrapped in Annotation instances.
Input method highlights are used while text is being composed by an input method. Text editing components should retain them even if they generally only deal with unstyled text, and make them available to the drawing routines.
Single pixel solid low underline.
Double pixel solid low underline.
Single pixel dotted low underline.
Double pixel gray low underline.
Single pixel dashed low underline.
Attribute key for swapping foreground and background
Paints
. Values are instances of
Boolean
. The default value is
false
, which means do not swap colors.
The constant value SWAP_COLORS_ON is defined.
If the FOREGROUND attribute is set, its Paint will be used as the background, otherwise the Paint currently on the Graphics will be used. If the BACKGROUND attribute is set, its Paint will be used as the foreground, otherwise the system will find a contrasting color to the (resolved) background so that the text will be visible.
Swap foreground and background.
Attribute key for converting ASCII decimal digits to other decimal ranges. Values are instances of
NumericShaper
. The default is
null
, which means do not perform numeric shaping.
When a numeric shaper is defined, the text is first processed by the shaper before any other analysis of the text is performed.
Note: This should have the same value for all the text in the paragraph, otherwise the behavior is undetermined.
Attribute key to request kerning. Values are instances of
Integer
. The default value is
0
, which does not request kerning.
The constant value KERNING_ON is provided.
The default advances of single characters are not appropriate for some character sequences, for example "To" or "AWAY". Without kerning the adjacent characters appear to be separated by too much space. Kerning causes selected sequences of characters to be spaced differently for a more pleasing visual appearance.
Request standard kerning.
Attribute key for enabling optional ligatures. Values are instances of
Integer
. The default value is
0
, which means do not use optional ligatures.
The constant value LIGATURES_ON is defined.
Ligatures required by the writing system are always enabled.
Request standard optional ligatures.
Attribute key to control tracking. Values are instances of
Number
. The default value is
0
, which means no additional tracking.
The constant values TRACKING_TIGHT and TRACKING_LOOSE are provided.
The tracking value is multiplied by the font point size and passed through the font transform to determine an additional amount to add to the advance of each glyph cluster. Positive tracking values will inhibit formation of optional ligatures. Tracking values are typically between -0.1 and 0.3; values outside this range are generally not desirable.
Perform tight tracking.
Perform loose tracking.
Constructs a TextAttribute with the specified name.
name - the attribute name to assign to this TextAttribute
Resolves instances being deserialized to the predefined constants.
readResolve in class AttributedCharacterIterator.Attribute
Attribute object
InvalidObjectException - if the object to resolve is not an instance of Attribute
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4