Examples of java.awt.font.TextAttribute

java.awt.font.TextAttribute

The TextAttribute class defines attribute keys and attribute values used for text rendering.

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.

For each text attribute, the documentation provides:

the type of its value,
the relevant predefined constants, if any
the default effect if the attribute is absent
the valid values if there are limitations
a description of the effect.

Values

The values of attributes must always be immutable.
Where value limitations are given, any value outside of that set is reserved for future use; the value will be treated as the default.
The value null is treated the same as the default value and results in the default behavior.
If the value is not of the proper type, the attribute will be ignored.
The identity of the value does not matter, only the actual value. For example, TextAttribute.WEIGHT_BOLD and new Float(2.0) indicate the same WEIGHT.
Attribute values of type 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.
The values for 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.

Summary of attributes

Key	Value Type	Principal Constants	Default Value
{@link #FAMILY}	String	See Font {@link java.awt.Font#DIALOG DIALOG}, {@link java.awt.Font#DIALOG_INPUT DIALOG_INPUT}, {@link java.awt.Font#SERIF SERIF}, {@link java.awt.Font#SANS_SERIF SANS_SERIF}, and {@link java.awt.Font#MONOSPACED MONOSPACED}.	"Default" (use platform default)
{@link #WEIGHT}	Number	WEIGHT_REGULAR, WEIGHT_BOLD	WEIGHT_REGULAR
{@link #WIDTH}	Number	WIDTH_CONDENSED, WIDTH_REGULAR, WIDTH_EXTENDED	WIDTH_REGULAR
{@link #POSTURE}	Number	POSTURE_REGULAR, POSTURE_OBLIQUE	POSTURE_REGULAR
{@link #SIZE}	Number	none	12.0
{@link #TRANSFORM}	{@link TransformAttribute}	See TransformAttribute {@link TransformAttribute#IDENTITY IDENTITY}	TransformAttribute.IDENTITY
{@link #SUPERSCRIPT}	Integer	SUPERSCRIPT_SUPER, SUPERSCRIPT_SUB	0 (use the standard glyphs and metrics)
{@link #FONT}	{@link java.awt.Font}	none	null (do not override font resolution)
{@link #CHAR_REPLACEMENT}	{@link GraphicAttribute}	none	null (draw text using font glyphs)
{@link #FOREGROUND}	{@link java.awt.Paint}	none	null (use current graphics paint)
{@link #BACKGROUND}	{@link java.awt.Paint}	none	null (do not render background)
{@link #UNDERLINE}	Integer	UNDERLINE_ON	-1 (do not render underline)
{@link #STRIKETHROUGH}	Boolean	STRIKETHROUGH_ON	false (do not render strikethrough)
{@link #RUN_DIRECTION}	Boolean	RUN_DIRECTION_LTR RUN_DIRECTION_RTL	null (use {@link java.text.Bidi} standard default)
{@link #BIDI_EMBEDDING}	Integer	none	0 (use base line direction)
{@link #JUSTIFICATION}	Number	JUSTIFICATION_FULL	JUSTIFICATION_FULL
{@link #INPUT_METHOD_HIGHLIGHT}	{@link java.awt.im.InputMethodHighlight}, {@link java.text.Annotation}	(see class)	null (do not apply input highlighting)
{@link #INPUT_METHOD_UNDERLINE}	Integer	UNDERLINE_LOW_ONE_PIXEL, UNDERLINE_LOW_TWO_PIXEL	-1 (do not render underline)
{@link #SWAP_COLORS}	Boolean	SWAP_COLORS_ON	false (do not swap colors)
{@link #NUMERIC_SHAPING}	{@link java.awt.font.NumericShaper}	none	null (do not shape digits)
{@link #KERNING}	Integer	KERNING_ON	0 (do not request kerning)
{@link #LIGATURES}	Integer	LIGATURES_ON	0 (do not form optional ligatures)
{@link #TRACKING}	Number	TRACKING_LOOSE, TRACKING_TIGHT	0 (do not add tracking)

@see java.awt.Font @see java.awt.font.TextLayout @see java.text.AttributedCharacterIterator

        underline = false;
        strikethrough = false;
        for (AttributedCharacterIterator.Attribute attribute: iter.getAttributes().keySet()) {
            if (!(attribute instanceof TextAttribute))
                continue;
            TextAttribute textattribute = (TextAttribute)attribute;
            if(textattribute.equals(TextAttribute.FONT)) {
                Font font = (Font)iter.getAttributes().get(textattribute);
                setFont(font);
            }
            else if(textattribute.equals(TextAttribute.UNDERLINE)) {
                if(iter.getAttributes().get(textattribute) == TextAttribute.UNDERLINE_ON)
                    underline = true;
            }
            else if(textattribute.equals(TextAttribute.STRIKETHROUGH)) {
              if(iter.getAttributes().get(textattribute) == TextAttribute.STRIKETHROUGH_ON)
                strikethrough = true;
            }
            else if(textattribute.equals(TextAttribute.SIZE)) {
                Object obj = iter.getAttributes().get(textattribute);
                if(obj instanceof Integer) {
                    int i = ((Integer)obj).intValue();
                    setFont(getFont().deriveFont(getFont().getStyle(), i));
                }
                else if(obj instanceof Float) {
                    float f = ((Float)obj).floatValue();
                    setFont(getFont().deriveFont(getFont().getStyle(), f));
                }
            }
            else if(textattribute.equals(TextAttribute.FOREGROUND)) {
                setColor((Color) iter.getAttributes().get(textattribute));
            }
            else if(textattribute.equals(TextAttribute.FAMILY)) {
              Font font = getFont();
              Map fontAttributes = font.getAttributes();
              fontAttributes.put(TextAttribute.FAMILY, iter.getAttributes().get(textattribute));
              setFont(font.deriveFont(fontAttributes));
            }
            else if(textattribute.equals(TextAttribute.POSTURE)) {
              Font font = getFont();
              Map fontAttributes = font.getAttributes();
              fontAttributes.put(TextAttribute.POSTURE, iter.getAttributes().get(textattribute));
              setFont(font.deriveFont(fontAttributes));
            }
            else if(textattribute.equals(TextAttribute.WEIGHT)) {
              Font font = getFont();
              Map fontAttributes = font.getAttributes();
              fontAttributes.put(TextAttribute.WEIGHT, iter.getAttributes().get(textattribute));
              setFont(font.deriveFont(fontAttributes));
            }

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