JDK14/Java14源码在线阅读
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/*
* (C) Copyright Taligent, Inc. 1996 - 1997, All Rights Reserved
* (C) Copyright IBM Corp. 1996 - 1998, All Rights Reserved
*
* The original version of this source code and documentation is
* copyrighted and owned by Taligent, Inc., a wholly-owned subsidiary
* of IBM. These materials are provided under terms of a License
* Agreement between Taligent and Sun. This technology is protected
* by multiple US and International patents.
*
* This notice and attribution to Taligent may not be removed.
* Taligent is a registered trademark of Taligent, Inc.
*
*/
package java.awt.font;
import java.io.InvalidObjectException;
import java.text.AttributedCharacterIterator.Attribute;
import java.util.Map;
import java.util.HashMap;
import jdk.internal.access.SharedSecrets;
/**
* The {@code TextAttribute} class defines attribute keys and
* attribute values used for text rendering.
* <p>
* {@code TextAttribute} instances are used as attribute keys to
* identify attributes in
* {@link java.awt.Font Font},
* {@link java.awt.font.TextLayout TextLayout},
* {@link java.text.AttributedCharacterIterator AttributedCharacterIterator},
* and other classes handling text attributes. Other constants defined
* in this class can be used as attribute values.
* <p>
* For each text attribute, the documentation provides:
* <UL>
* <LI>the type of its value,
* <LI>the relevant predefined constants, if any
* <LI>the default effect if the attribute is absent
* <LI>the valid values if there are limitations
* <LI>a description of the effect.
* </UL>
*
* <H2>Values</H2>
* <UL>
* <LI>The values of attributes must always be immutable.
* <LI>Where value limitations are given, any value outside of that
* set is reserved for future use; the value will be treated as
* the default.
* <LI>The value {@code null} is treated the same as the
* default value and results in the default behavior.
* <li>If the value is not of the proper type, the attribute
* will be ignored.
* <li>The identity of the value does not matter, only the actual
* value. For example, {@code TextAttribute.WEIGHT_BOLD} and
* {@code Float.valueOf(2.0f)}
* indicate the same {@code WEIGHT}.
* <li>Attribute values of type {@code Number} (used for
* {@code WEIGHT}, {@code WIDTH}, {@code POSTURE},
* {@code SIZE}, {@code JUSTIFICATION}, and
* {@code TRACKING}) can vary along their natural range and are
* not restricted to the predefined constants.
* {@code Number.floatValue()} is used to get the actual value
* from the {@code Number}.
* <li>The values for {@code WEIGHT}, {@code WIDTH}, and
* {@code POSTURE} are interpolated by the system, which
* can select the 'nearest available' font or use other techniques to
* approximate the user's request.
*
* </UL>
*
* <h3>Summary of attributes</h3>
*
* <table style="width:95%;margin: 0px auto" class="striped">
* <caption>Key, value type, principal constants, and default value behavior of
* all TextAttributes</caption>
* <thead>
* <tr>
* <th scope="col">Key
* <th scope="col">Value Type
* <th scope="col">Principal Constants
* <th scope="col">Default Value
* </thead>
* <tbody>
* <tr>
* <th scope="row">{@link #FAMILY}
* <td>String
* <td>See Font {@link java.awt.Font#DIALOG DIALOG},
* {@link java.awt.Font#DIALOG_INPUT DIALOG_INPUT},
* <br>
* {@link java.awt.Font#SERIF SERIF},
* {@link java.awt.Font#SANS_SERIF SANS_SERIF}, and
* {@link java.awt.Font#MONOSPACED MONOSPACED}.
* <td>"Default" (use platform default)
* <tr>
* <th scope="row">{@link #WEIGHT}
* <td>Number
* <td>WEIGHT_REGULAR, WEIGHT_BOLD
* <td>WEIGHT_REGULAR
* <tr>
* <th scope="row">{@link #WIDTH}
* <td>Number
* <td>WIDTH_CONDENSED, WIDTH_REGULAR,<br>WIDTH_EXTENDED
* <td>WIDTH_REGULAR
* <tr>
* <th scope="row">{@link #POSTURE}
* <td>Number
* <td>POSTURE_REGULAR, POSTURE_OBLIQUE
* <td>POSTURE_REGULAR
* <tr>
* <th scope="row">{@link #SIZE}
* <td>Number
* <td>none
* <td>12.0
* <tr>
* <th scope="row">{@link #TRANSFORM}
* <td>{@link TransformAttribute}
* <td>See TransformAttribute {@link TransformAttribute#IDENTITY IDENTITY}
* <td>TransformAttribute.IDENTITY
* <tr>
* <th scope="row">{@link #SUPERSCRIPT}
* <td>Integer
* <td>SUPERSCRIPT_SUPER, SUPERSCRIPT_SUB
* <td>0 (use the standard glyphs and metrics)
* <tr>
* <th scope="row">{@link #FONT}
* <td>{@link java.awt.Font}
* <td>none
* <td>null (do not override font resolution)
* <tr>
* <th scope="row">{@link #CHAR_REPLACEMENT}
* <td>{@link GraphicAttribute}
* <td>none
* <td>null (draw text using font glyphs)
* <tr>
* <th scope="row">{@link #FOREGROUND}
* <td>{@link java.awt.Paint}
* <td>none
* <td>null (use current graphics paint)
* <tr>
* <th scope="row">{@link #BACKGROUND}
* <td>{@link java.awt.Paint}
* <td>none
* <td>null (do not render background)
* <tr>
* <th scope="row">{@link #UNDERLINE}
* <td>Integer
* <td>UNDERLINE_ON
* <td>-1 (do not render underline)
* <tr>
* <th scope="row">{@link #STRIKETHROUGH}
* <td>Boolean
* <td>STRIKETHROUGH_ON
* <td>false (do not render strikethrough)
* <tr>
* <th scope="row">{@link #RUN_DIRECTION}
* <td>Boolean
* <td>RUN_DIRECTION_LTR<br>RUN_DIRECTION_RTL
* <td>null (use {@link java.text.Bidi} standard default)
* <tr>
* <th scope="row">{@link #BIDI_EMBEDDING}
* <td>Integer
* <td>none
* <td>0 (use base line direction)
* <tr>
* <th scope="row">{@link #JUSTIFICATION}
* <td>Number
* <td>JUSTIFICATION_FULL
* <td>JUSTIFICATION_FULL
* <tr>
* <th scope="row">{@link #INPUT_METHOD_HIGHLIGHT}
* <td>{@link java.awt.im.InputMethodHighlight},
* <br>
* {@link java.text.Annotation}
* <td>(see class)
* <td>null (do not apply input highlighting)
* <tr>
* <th scope="row">{@link #INPUT_METHOD_UNDERLINE}
* <td>Integer
* <td>UNDERLINE_LOW_ONE_PIXEL,<br>UNDERLINE_LOW_TWO_PIXEL
* <td>-1 (do not render underline)
* <tr>
* <th scope="row">{@link #SWAP_COLORS}
* <td>Boolean
* <td>SWAP_COLORS_ON
* <td>false (do not swap colors)
* <tr>
* <th scope="row">{@link #NUMERIC_SHAPING}
* <td>{@link java.awt.font.NumericShaper}
* <td>none
* <td>null (do not shape digits)
* <tr>
* <th scope="row">{@link #KERNING}
* <td>Integer
* <td>KERNING_ON
* <td>0 (do not request kerning)
* <tr>
* <th scope="row">{@link #LIGATURES}
* <td>Integer
* <td>LIGATURES_ON
* <td>0 (do not form optional ligatures)
* <tr>
* <th scope="row">{@link #TRACKING}
* <td>Number
* <td>TRACKING_LOOSE, TRACKING_TIGHT
* <td>0 (do not add tracking)
* </tr>
* </tbody>
* </table>
*
* @see java.awt.Font
* @see java.awt.font.TextLayout
* @see java.text.AttributedCharacterIterator
*/
public final class TextAttribute extends Attribute {
// table of all instances in this class, used by readResolve
private static final Map<String, TextAttribute>
instanceMap = new HashMap<String, TextAttribute>(29);
// For access from java.text.Bidi
static {
if (SharedSecrets.getJavaAWTFontAccess() == null) {
SharedSecrets.setJavaAWTFontAccess(new JavaAWTFontAccessImpl());
}
}
/**
* Constructs a {@code TextAttribute} with the specified name.
* @param name the attribute name to assign to this
* {@code TextAttribute}
*/
protected TextAttribute(String name) {
super(name);
if (this.getClass() == TextAttribute.class) {
instanceMap.put(name, this);
}
}
/**
* Resolves instances being deserialized to the predefined constants.
*/
protected Object readResolve() throws InvalidObjectException {
if (this.getClass() != TextAttribute.class) {
throw new InvalidObjectException(
"subclass didn't correctly implement readResolve");
}
TextAttribute instance = instanceMap.get(getName());
if (instance != null) {
return instance;
} else {
throw new InvalidObjectException("unknown attribute name");
}
}
// Serialization compatibility with Java 2 platform v1.2.
// 1.2 will throw an InvalidObjectException if ever asked to
// deserialize INPUT_METHOD_UNDERLINE.
// This shouldn't happen in real life.
static final long serialVersionUID = 7744112784117861702L;
//
// For use with Font.
//
/**
* Attribute key for the font name. Values are instances of
* <b>{@code String}</b>. The default value is
* {@code "Default"}, which causes the platform default font
* family to be used.
*
* <p> The {@code Font} class defines constants for the logical
* font names
* {@link java.awt.Font#DIALOG DIALOG},
* {@link java.awt.Font#DIALOG_INPUT DIALOG_INPUT},
* {@link java.awt.Font#SANS_SERIF SANS_SERIF},
* {@link java.awt.Font#SERIF SERIF}, and
* {@link java.awt.Font#MONOSPACED MONOSPACED}.
*
* <p>This defines the value passed as {@code name} to the
* {@code 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.
*
* <p><em>Note:</em> 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 <em>regular</em> weight.
* The "Bold" in the name is part of the face name, not a separate
* request that the font's weight be bold.</p>
*/
public static final TextAttribute FAMILY =
new TextAttribute("family");
/**
* Attribute key for the weight of a font. Values are instances
* of <b>{@code Number}</b>. The default value is
* {@code WEIGHT_REGULAR}.
*
* <p>Several constant values are provided, see {@link
* #WEIGHT_EXTRA_LIGHT}, {@link #WEIGHT_LIGHT}, {@link
* #WEIGHT_DEMILIGHT}, {@link #WEIGHT_REGULAR}, {@link
* #WEIGHT_SEMIBOLD}, {@link #WEIGHT_MEDIUM}, {@link
* #WEIGHT_DEMIBOLD}, {@link #WEIGHT_BOLD}, {@link #WEIGHT_HEAVY},
* {@link #WEIGHT_EXTRABOLD}, and {@link #WEIGHT_ULTRABOLD}. The
* value {@code WEIGHT_BOLD} corresponds to the
* style value {@code Font.BOLD} as passed to the
* {@code Font} constructor.
*
* <p>The value is roughly the ratio of the stem width to that of
* the regular weight.
*
* <p>The system can interpolate the provided value.
*/
public static final TextAttribute WEIGHT =
new TextAttribute("weight");
/**
* The lightest predefined weight.
* @see #WEIGHT
*/
public static final Float WEIGHT_EXTRA_LIGHT =
Float.valueOf(0.5f);
/**
* The standard light weight.
* @see #WEIGHT
*/
public static final Float WEIGHT_LIGHT =
Float.valueOf(0.75f);
/**
* An intermediate weight between {@code WEIGHT_LIGHT} and
* {@code WEIGHT_STANDARD}.
* @see #WEIGHT
*/
public static final Float WEIGHT_DEMILIGHT =
Float.valueOf(0.875f);
/**
* The standard weight. This is the default value for {@code WEIGHT}.
* @see #WEIGHT
*/
public static final Float WEIGHT_REGULAR =
Float.valueOf(1.0f);
/**
* A moderately heavier weight than {@code WEIGHT_REGULAR}.
* @see #WEIGHT
*/
public static final Float WEIGHT_SEMIBOLD =
Float.valueOf(1.25f);
/**
* An intermediate weight between {@code WEIGHT_REGULAR} and
* {@code WEIGHT_BOLD}.
* @see #WEIGHT
*/
public static final Float WEIGHT_MEDIUM =
Float.valueOf(1.5f);
/**
* A moderately lighter weight than {@code WEIGHT_BOLD}.
* @see #WEIGHT
*/
public static final Float WEIGHT_DEMIBOLD =
Float.valueOf(1.75f);
/**
* The standard bold weight.
* @see #WEIGHT
*/
public static final Float WEIGHT_BOLD =
Float.valueOf(2.0f);
/**
* A moderately heavier weight than {@code WEIGHT_BOLD}.
* @see #WEIGHT
*/
public static final Float WEIGHT_HEAVY =
Float.valueOf(2.25f);
/**
* An extra heavy weight.
* @see #WEIGHT
*/
public static final Float WEIGHT_EXTRABOLD =
Float.valueOf(2.5f);
/**
* The heaviest predefined weight.
* @see #WEIGHT
*/
public static final Float WEIGHT_ULTRABOLD =
Float.valueOf(2.75f);
/**
* Attribute key for the width of a font. Values are instances of
* <b>{@code Number}</b>. The default value is
* {@code WIDTH_REGULAR}.
*
* <p>Several constant values are provided, see {@link
* #WIDTH_CONDENSED}, {@link #WIDTH_SEMI_CONDENSED}, {@link
* #WIDTH_REGULAR}, {@link #WIDTH_SEMI_EXTENDED}, {@link
* #WIDTH_EXTENDED}.
*
* <p>The value is roughly the ratio of the advance width to that
* of the regular width.
*
* <p>The system can interpolate the provided value.
*/
public static final TextAttribute WIDTH =
new TextAttribute("width");
/**
* The most condensed predefined width.
* @see #WIDTH
*/
public static final Float WIDTH_CONDENSED =
Float.valueOf(0.75f);
/**
* A moderately condensed width.
* @see #WIDTH
*/
public static final Float WIDTH_SEMI_CONDENSED =
Float.valueOf(0.875f);
/**
* The standard width. This is the default value for
* {@code WIDTH}.
* @see #WIDTH
*/
public static final Float WIDTH_REGULAR =
Float.valueOf(1.0f);
/**
* A moderately extended width.
* @see #WIDTH
*/
public static final Float WIDTH_SEMI_EXTENDED =
Float.valueOf(1.25f);
/**
* The most extended predefined width.
* @see #WIDTH
*/
public static final Float WIDTH_EXTENDED =
Float.valueOf(1.5f);
/**
* Attribute key for the posture of a font. Values are instances
* of <b>{@code Number}</b>. The default value is
* {@code POSTURE_REGULAR}.
*
* <p>Two constant values are provided, {@link #POSTURE_REGULAR}
* and {@link #POSTURE_OBLIQUE}. The value
* {@code POSTURE_OBLIQUE} corresponds to the style value
* {@code Font.ITALIC} as passed to the {@code Font}
* constructor.
*
* <p>The value is roughly the slope of the stems of the font,
* expressed as the run over the rise. Positive values lean right.
*
* <p>The system can interpolate the provided value.
*
* <p>This will affect the font's italic angle as returned by
* {@code Font.getItalicAngle}.
*
* @see java.awt.Font#getItalicAngle()
*/
public static final TextAttribute POSTURE =
new TextAttribute("posture");
/**
* The standard posture, upright. This is the default value for
* {@code POSTURE}.
* @see #POSTURE
*/
public static final Float POSTURE_REGULAR =
Float.valueOf(0.0f);
/**
* The standard italic posture.
* @see #POSTURE
*/
public static final Float POSTURE_OBLIQUE =
Float.valueOf(0.20f);
/**
* Attribute key for the font size. Values are instances of
* <b>{@code Number}</b>. The default value is 12pt.
*
* <p>This corresponds to the {@code size} parameter to the
* {@code Font} constructor.
*
* <p>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.
*
* <p>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.
*/
public static final TextAttribute SIZE =
new TextAttribute("size");
/**
* Attribute key for the transform of a font. Values are
* instances of <b>{@code TransformAttribute}</b>. The
* default value is {@code TransformAttribute.IDENTITY}.
*
* <p>The {@code TransformAttribute} class defines the
* constant {@link TransformAttribute#IDENTITY IDENTITY}.
*
* <p>This corresponds to the transform passed to
* {@code Font.deriveFont(AffineTransform)}. Since that
* transform is mutable and {@code TextAttribute} values must
* not be, the {@code TransformAttribute} wrapper class is
* used.
*
* <p>The primary intent is to support scaling and skewing, though
* other effects are possible.</p>
*
* <p>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.</p>
*
* <p>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 {@link
* TextLayout#getLayoutPath}.</p>
*
* @see TransformAttribute
* @see java.awt.geom.AffineTransform
*/
public static final TextAttribute TRANSFORM =
new TextAttribute("transform");
/**
* Attribute key for superscripting and subscripting. Values are
* instances of <b>{@code Integer}</b>. The default value is
* 0, which means that no superscript or subscript is used.
*
* <p>Two constant values are provided, see {@link
* #SUPERSCRIPT_SUPER} and {@link #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.
*
* <p>{@code SUPERSCRIPT} can
* impact the ascent and descent of a font. The ascent
* and descent can never become negative, however.
*/
public static final TextAttribute SUPERSCRIPT =
new TextAttribute("superscript");
/**
* Standard superscript.
* @see #SUPERSCRIPT
*/
public static final Integer SUPERSCRIPT_SUPER =
Integer.valueOf(1);
/**
* Standard subscript.
* @see #SUPERSCRIPT
*/
public static final Integer SUPERSCRIPT_SUB =
Integer.valueOf(-1);
/**
* Attribute key used to provide the font to use to render text.
* Values are instances of {@link java.awt.Font}. The default
* value is null, indicating that normal resolution of a
* {@code Font} from attributes should be performed.
*
* <p>{@code TextLayout} and
* {@code AttributedCharacterIterator} work in terms of
* {@code Maps} of {@code TextAttributes}. Normally,
* all the attributes are examined and used to select and
* configure a {@code Font} instance. If a {@code FONT}
* attribute is present, though, its associated {@code Font}
* will be used. This provides a way for users to override the
* resolution of font attributes into a {@code Font}, or
* force use of a particular {@code Font} instance. This
* also allows users to specify subclasses of {@code Font} in
* cases where a {@code Font} can be subclassed.
*
* <p>{@code FONT} is used for special situations where
* clients already have a {@code Font} instance but still
* need to use {@code Map}-based APIs. Typically, there will
* be no other attributes in the {@code Map} except the
* {@code FONT} attribute. With {@code Map}-based APIs
* the common case is to specify all attributes individually, so
* {@code FONT} is not needed or desirable.
*
* <p>However, if both {@code FONT} and other attributes are
* present in the {@code Map}, the rendering system will
* merge the attributes defined in the {@code Font} with the
* additional attributes. This merging process classifies
* {@code TextAttributes} into two groups. One group, the
* 'primary' group, is considered fundamental to the selection and
* metric behavior of a font. These attributes are
* {@code FAMILY}, {@code WEIGHT}, {@code WIDTH},
* {@code POSTURE}, {@code SIZE},
* {@code TRANSFORM}, {@code SUPERSCRIPT}, and
* {@code TRACKING}. The other group, the 'secondary' group,
* consists of all other defined attributes, with the exception of
* {@code FONT} itself.
*
* <p>To generate the new {@code Map}, first the
* {@code Font} is obtained from the {@code FONT}
* attribute, and <em>all</em> of its attributes extracted into a
* new {@code Map}. Then only the <em>secondary</em>
* attributes from the original {@code Map} are added to
* those in the new {@code Map}. Thus the values of primary
* attributes come solely from the {@code Font}, and the
* values of secondary attributes originate with the
* {@code Font} but can be overridden by other values in the
* {@code Map}.
*
* <p><em>Note:</em>{@code Font's Map}-based
* constructor and {@code deriveFont} methods do not process
* the {@code FONT} attribute, as these are used to create
* new {@code Font} objects. Instead, {@link
* java.awt.Font#getFont(Map) Font.getFont(Map)} should be used to
* handle the {@code FONT} attribute.
*
* @see java.awt.Font
*/
public static final TextAttribute FONT =
new TextAttribute("font");
/**
* 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.
*
* <p>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 {@link java.text.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
* <code>\uFFFC</code>.
*
* <p>The GraphicAttribute determines the logical and visual
* bounds of the text; the actual Font values are ignored.
*
* @see GraphicAttribute
*/
public static final TextAttribute CHAR_REPLACEMENT =
new TextAttribute("char_replacement");
//
// Adornments added to text.
//
/**
* Attribute key for the paint used to render the text. Values are
* instances of <b>{@code Paint}</b>. The default value is
* null, indicating that the {@code Paint} set on the
* {@code Graphics2D} at the time of rendering is used.
*
* <p>Glyphs will be rendered using this
* {@code Paint} regardless of the {@code Paint} value
* set on the {@code Graphics} (but see {@link #SWAP_COLORS}).
*
* @see java.awt.Paint
* @see #SWAP_COLORS
*/
public static final TextAttribute FOREGROUND =
new TextAttribute("foreground");
/**
* Attribute key for the paint used to render the background of
* the text. Values are instances of <b>{@code Paint}</b>.
* The default value is null, indicating that the background
* should not be rendered.
*
* <p>The logical bounds of the text will be filled using this
* {@code Paint}, and then the text will be rendered on top
* of it (but see {@link #SWAP_COLORS}).
*
* <p>The visual bounds of the text is extended to include the
* logical bounds, if necessary. The outline is not affected.
*
* @see java.awt.Paint
* @see #SWAP_COLORS
*/
public static final TextAttribute BACKGROUND =
new TextAttribute("background");
/**
* Attribute key for underline. Values are instances of
* <b>{@code Integer}</b>. The default value is -1, which
* means no underline.
*
* <p>The constant value {@link #UNDERLINE_ON} is provided.
*
* <p>The underline affects both the visual bounds and the outline
* of the text.
*/
public static final TextAttribute UNDERLINE =
new TextAttribute("underline");
/**
* Standard underline.
*
* @see #UNDERLINE
*/
public static final Integer UNDERLINE_ON =
Integer.valueOf(0);
/**
* Attribute key for strikethrough. Values are instances of
* <b>{@code Boolean}</b>. The default value is
* {@code false}, which means no strikethrough.
*
* <p>The constant value {@link #STRIKETHROUGH_ON} is provided.
*
* <p>The strikethrough affects both the visual bounds and the
* outline of the text.
*/
public static final TextAttribute STRIKETHROUGH =
new TextAttribute("strikethrough");
/**
* A single strikethrough.
*
* @see #STRIKETHROUGH
*/
public static final Boolean STRIKETHROUGH_ON =
Boolean.TRUE;
//
// Attributes use to control layout of text on a line.
//
/**
* Attribute key for the run direction of the line. Values are
* instances of <b>{@code Boolean}</b>. The default value is
* null, which indicates that the standard Bidi algorithm for
* determining run direction should be used with the value {@link
* java.text.Bidi#DIRECTION_DEFAULT_LEFT_TO_RIGHT}.
*
* <p>The constants {@link #RUN_DIRECTION_RTL} and {@link
* #RUN_DIRECTION_LTR} are provided.
*
* <p>This determines the value passed to the {@link
* java.text.Bidi} constructor to select the primary direction of
* the text in the paragraph.
*
* <p><em>Note:</em> This attribute should have the same value for
* all the text in a paragraph, otherwise the behavior is
* undetermined.
*
* @see java.text.Bidi
*/
public static final TextAttribute RUN_DIRECTION =
new TextAttribute("run_direction");
/**
* Left-to-right run direction.
* @see #RUN_DIRECTION
*/
public static final Boolean RUN_DIRECTION_LTR =
Boolean.FALSE;
/**
* Right-to-left run direction.
* @see #RUN_DIRECTION
*/
public static final Boolean RUN_DIRECTION_RTL =
Boolean.TRUE;
/**
* Attribute key for the embedding level of the text. Values are
* instances of <b>{@code Integer}</b>. The default value is
* {@code null}, indicating that the Bidirectional
* algorithm should run without explicit embeddings.
*
* <p>Positive values 1 through 61 are <em>embedding</em> levels,
* negative values -1 through -61 are <em>override</em> levels.
* The value 0 means that the base line direction is used. These
* levels are passed in the embedding levels array to the {@link
* java.text.Bidi} constructor.
*
* <p><em>Note:</em> 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.
*
* @see java.text.Bidi
*/
public static final TextAttribute BIDI_EMBEDDING =
new TextAttribute("bidi_embedding");
/**
* Attribute key for the justification of a paragraph. Values are
* instances of <b>{@code Number}</b>. The default value is
* 1, indicating that justification should use the full width
* provided. Values are pinned to the range [0..1].
*
* <p>The constants {@link #JUSTIFICATION_FULL} and {@link
* #JUSTIFICATION_NONE} are provided.
*
* <p>Specifies the fraction of the extra space to use when
* justification is requested on a {@code 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.
*
* <p><em>Note:</em> This should have the same value for all the
* text in a paragraph, otherwise the behavior is undetermined.
*
* @see TextLayout#getJustifiedLayout
*/
public static final TextAttribute JUSTIFICATION =
new TextAttribute("justification");
/**
* Justify the line to the full requested width. This is the
* default value for {@code JUSTIFICATION}.
* @see #JUSTIFICATION
*/
public static final Float JUSTIFICATION_FULL =
Float.valueOf(1.0f);
/**
* Do not allow the line to be justified.
* @see #JUSTIFICATION
*/
public static final Float JUSTIFICATION_NONE =
Float.valueOf(0.0f);
//
// For use by input method.
//
/**
* Attribute key for input method highlight styles.
*
* <p>Values are instances of {@link
* java.awt.im.InputMethodHighlight} or {@link
* java.text.Annotation}. The default value is {@code null},
* which means that input method styles should not be applied
* before rendering.
*
* <p>If adjacent runs of text with the same
* {@code InputMethodHighlight} need to be rendered
* separately, the {@code InputMethodHighlights} should be
* wrapped in {@code Annotation} instances.
*
* <p>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.
*
* @see java.awt.Font
* @see java.awt.im.InputMethodHighlight
* @see java.text.Annotation
*/
public static final TextAttribute INPUT_METHOD_HIGHLIGHT =
new TextAttribute("input method highlight");
/**
* Attribute key for input method underlines. Values
* are instances of <b>{@code Integer}</b>. The default
* value is {@code -1}, which means no underline.
*
* <p>Several constant values are provided, see {@link
* #UNDERLINE_LOW_ONE_PIXEL}, {@link #UNDERLINE_LOW_TWO_PIXEL},
* {@link #UNDERLINE_LOW_DOTTED}, {@link #UNDERLINE_LOW_GRAY}, and
* {@link #UNDERLINE_LOW_DASHED}.
*
* <p>This may be used in conjunction with {@link #UNDERLINE} if
* desired. The primary purpose is for use by input methods.
* Other use of these underlines for simple ornamentation might
* confuse users.
*
* <p>The input method underline affects both the visual bounds and
* the outline of the text.
*
* @since 1.3
*/
public static final TextAttribute INPUT_METHOD_UNDERLINE =
new TextAttribute("input method underline");
/**
* Single pixel solid low underline.
* @see #INPUT_METHOD_UNDERLINE
* @since 1.3
*/
public static final Integer UNDERLINE_LOW_ONE_PIXEL =
Integer.valueOf(1);
/**
* Double pixel solid low underline.
* @see #INPUT_METHOD_UNDERLINE
* @since 1.3
*/
public static final Integer UNDERLINE_LOW_TWO_PIXEL =
Integer.valueOf(2);
/**
* Single pixel dotted low underline.
* @see #INPUT_METHOD_UNDERLINE
* @since 1.3
*/
public static final Integer UNDERLINE_LOW_DOTTED =
Integer.valueOf(3);
/**
* Double pixel gray low underline.
* @see #INPUT_METHOD_UNDERLINE
* @since 1.3
*/
public static final Integer UNDERLINE_LOW_GRAY =
Integer.valueOf(4);
/**
* Single pixel dashed low underline.
* @see #INPUT_METHOD_UNDERLINE
* @since 1.3
*/
public static final Integer UNDERLINE_LOW_DASHED =
Integer.valueOf(5);
/**
* Attribute key for swapping foreground and background
* {@code Paints}. Values are instances of
* <b>{@code Boolean}</b>. The default value is
* {@code false}, which means do not swap colors.
*
* <p>The constant value {@link #SWAP_COLORS_ON} is defined.
*
* <p>If the {@link #FOREGROUND} attribute is set, its
* {@code Paint} will be used as the background, otherwise
* the {@code Paint} currently on the {@code Graphics}
* will be used. If the {@link #BACKGROUND} attribute is set, its
* {@code Paint} will be used as the foreground, otherwise
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