org.piccolo2d.nodes.PText Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2011, Piccolo2D project, http://piccolo2d.org
* Copyright (c) 1998-2008, University of Maryland
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this list of conditions
* and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice, this list of conditions
* and the following disclaimer in the documentation and/or other materials provided with the
* distribution.
*
* None of the name of the University of Maryland, the name of the Piccolo2D project, or the names of its
* contributors may be used to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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package org.piccolo2d.nodes;
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.font.LineBreakMeasurer;
import java.awt.font.TextAttribute;
import java.awt.font.TextLayout;
import java.text.AttributedCharacterIterator;
import java.text.AttributedString;
import java.util.ArrayList;
import org.piccolo2d.PNode;
import org.piccolo2d.util.PPaintContext;
/**
* PText is a multi-line text node. The text will flow to base on the
* width of the node's bounds.
*
* @version 1.1
* @author Jesse Grosjean
*/
public class PText extends PNode {
/**
* Allows for future serialization code to understand versioned binary
* formats.
*/
private static final long serialVersionUID = 1L;
/**
* The property name that identifies a change of this node's text (see
* {@link #getText getText}). Both old and new value will be set in any
* property change event.
*/
public static final String PROPERTY_TEXT = "text";
/**
* The property code that identifies a change of this node's text (see
* {@link #getText getText}). Both old and new value will be set in any
* property change event.
*/
public static final int PROPERTY_CODE_TEXT = 1 << 19;
/**
* The property name that identifies a change of this node's font (see
* {@link #getFont getFont}). Both old and new value will be set in any
* property change event.
*/
public static final String PROPERTY_FONT = "font";
/**
* The property code that identifies a change of this node's font (see
* {@link #getFont getFont}). Both old and new value will be set in any
* property change event.
*/
public static final int PROPERTY_CODE_FONT = 1 << 20;
/**
* The property name that identifies a change of this node's text paint (see
* {@link #getTextPaint getTextPaint}). Both old and new value will be set
* in any property change event.
*
* @since 1.3
*/
public static final String PROPERTY_TEXT_PAINT = "text paint";
/**
* The property code that identifies a change of this node's text paint (see
* {@link #getTextPaint getTextPaint}). Both old and new value will be set
* in any property change event.
*
* @since 1.3
*/
public static final int PROPERTY_CODE_TEXT_PAINT = 1 << 21;
/**
* Default font, 12 point "SansSerif". Will be made final in
* version 2.0.
*/
// public static final Font DEFAULT_FONT = new Font(Font.SANS_SERIF,
// Font.PLAIN, 12); jdk 1.6+
public static final Font DEFAULT_FONT = new Font("SansSerif", Font.PLAIN, 12);
/**
* Default greek threshold, 5.5d. Will be made final in version
* 2.0.
*/
public static final double DEFAULT_GREEK_THRESHOLD = 5.5d;
/**
* Default horizontal alignment, Component.LEFT_ALIGNMENT.
*
* @since 1.3
*/
public static final float DEFAULT_HORIZONTAL_ALIGNMENT = Component.LEFT_ALIGNMENT;
/**
* Default text, "".
*
* @since 1.3
*/
public static final String DEFAULT_TEXT = "";
/**
* Default text paint, Color.BLACK.
*
* @since 1.3
*/
public static final Paint DEFAULT_TEXT_PAINT = Color.BLACK;
/** Empty text layout array. */
private static final TextLayout[] EMPTY_TEXT_LAYOUT_ARRAY = new TextLayout[0];
/** Text for this text node. */
private String text = DEFAULT_TEXT;
/** Text paint for this text node. */
private Paint textPaint = DEFAULT_TEXT_PAINT;
/** Font for this text node. */
private Font font = DEFAULT_FONT;
/**
* Greek threshold in screen font size for this text node. Will be made
* private in version 2.0.
*/
protected double greekThreshold = DEFAULT_GREEK_THRESHOLD;
/** Horizontal alignment for this text node. */
private float horizontalAlignment = DEFAULT_HORIZONTAL_ALIGNMENT;
/**
* True if this text node should constrain its height to the height of its
* text.
*/
private boolean constrainHeightToTextHeight = true;
/**
* True if this text node should constrain its height to the height of its
* text.
*/
private boolean constrainWidthToTextWidth = true;
/** One or more lines of text layout. */
private transient TextLayout[] lines;
/**
* Create a new text node with no text ("").
*/
public PText() {
super();
setText(DEFAULT_TEXT);
}
/**
* Create a new text node with the specified text.
*
* @param text text for this text node
*/
public PText(final String text) {
this();
setText(text);
}
/**
* Return the horizontal alignment for this text node. The horizontal
* alignment will be one of Component.LEFT_ALIGNMENT,
* Component.CENTER_ALIGNMENT, or
* Component.RIGHT_ALIGNMENT. Defaults to
* {@link #DEFAULT_HORIZONTAL_ALIGNMENT}.
*
* @since 1.3
* @return the horizontal alignment for this text node
*/
public float getHorizontalAlignment() {
return horizontalAlignment;
}
/**
* Set the horizontal alignment for this text node to
* horizontalAlignment.
*
* @since 1.3
* @param horizontalAlignment horizontal alignment, must be one of
* Component.LEFT_ALIGNMENT,
* Component.CENTER_ALIGNMENT, or
* Component.RIGHT_ALIGNMENT
*/
public void setHorizontalAlignment(final float horizontalAlignment) {
if (!validHorizontalAlignment(horizontalAlignment)) {
throw new IllegalArgumentException("horizontalAlignment must be one of Component.LEFT_ALIGNMENT, "
+ "Component.CENTER_ALIGNMENT, or Component.RIGHT_ALIGNMENT");
}
this.horizontalAlignment = horizontalAlignment;
}
/**
* Return true if the specified horizontal alignment is one of
* Component.LEFT_ALIGNMENT,
* Component.CENTER_ALIGNMENT, or
* Component.RIGHT_ALIGNMENT.
*
* @param horizontalAlignment horizontal alignment
* @return true if the specified horizontal alignment is one of
* Component.LEFT_ALIGNMENT,
* Component.CENTER_ALIGNMENT, or
* Component.RIGHT_ALIGNMENT
*/
private static boolean validHorizontalAlignment(final float horizontalAlignment) {
return Component.LEFT_ALIGNMENT == horizontalAlignment || Component.CENTER_ALIGNMENT == horizontalAlignment
|| Component.RIGHT_ALIGNMENT == horizontalAlignment;
}
/**
* Return the paint used to paint this node's text.
*
* @return the paint used to paint this node's text
*/
public Paint getTextPaint() {
return textPaint;
}
/**
* Set the paint used to paint this node's text to textPaint.
*
*
* This is a bound property.
*
*
* @param textPaint text paint
*/
public void setTextPaint(final Paint textPaint) {
if (textPaint == this.textPaint) {
return;
}
final Paint oldTextPaint = this.textPaint;
this.textPaint = textPaint;
invalidatePaint();
firePropertyChange(PROPERTY_CODE_TEXT_PAINT, PROPERTY_TEXT_PAINT, oldTextPaint, this.textPaint);
}
/**
* Return true if this text node should constrain its width to the width of
* its text. Defaults to true.
*
* @return true if this text node should constrain its width to the width of
* its text
*/
public boolean isConstrainWidthToTextWidth() {
return constrainWidthToTextWidth;
}
/**
* Set to true if this text node should constrain its width to
* the width of its text.
*
* @param constrainWidthToTextWidth true if this text node should constrain
* its width to the width of its text
*/
public void setConstrainWidthToTextWidth(final boolean constrainWidthToTextWidth) {
this.constrainWidthToTextWidth = constrainWidthToTextWidth;
recomputeLayout();
}
/**
* Return true if this text node should constrain its height to the height
* of its text. Defaults to true.
*
* @return true if this text node should constrain its height to the height
* of its text
*/
public boolean isConstrainHeightToTextHeight() {
return constrainHeightToTextHeight;
}
/**
* Set to true if this text node should constrain its height to
* the height of its text.
*
* @param constrainHeightToTextHeight true if this text node should
* constrain its height to the height of its text
*/
public void setConstrainHeightToTextHeight(final boolean constrainHeightToTextHeight) {
this.constrainHeightToTextHeight = constrainHeightToTextHeight;
recomputeLayout();
}
/**
* Return the greek threshold in screen font size. When the screen font size
* will be below this threshold the text is rendered as 'greek' instead of
* drawing the text glyphs. Defaults to {@link #DEFAULT_GREEK_THRESHOLD}.
*
* @see PText#paintGreek(PPaintContext)
* @return the current greek threshold in screen font size
*/
public double getGreekThreshold() {
return greekThreshold;
}
/**
* Set the greek threshold in screen font size to
* greekThreshold. When the screen font size will be below this
* threshold the text is rendered as 'greek' instead of drawing the text
* glyphs.
*
* @see PText#paintGreek(PPaintContext)
* @param greekThreshold greek threshold in screen font size
*/
public void setGreekThreshold(final double greekThreshold) {
this.greekThreshold = greekThreshold;
invalidatePaint();
}
/**
* Return the text for this text node. Defaults to {@link #DEFAULT_TEXT}.
*
* @return the text for this text node
*/
public String getText() {
return text;
}
/**
* Set the text for this node to text. The text will be broken
* up into multiple lines based on the size of the text and the bounds width
* of this node.
*
*
* This is a bound property.
*
*
* @param newText text for this text node
*/
public void setText(final String newText) {
if (newText == null && text == null || newText != null && newText.equals(text)) {
return;
}
final String oldText = text;
if (newText == null) {
text = DEFAULT_TEXT;
}
else {
text = newText;
}
lines = null;
recomputeLayout();
invalidatePaint();
firePropertyChange(PROPERTY_CODE_TEXT, PROPERTY_TEXT, oldText, text);
}
/**
* Return the font for this text node. Defaults to {@link #DEFAULT_FONT}.
*
* @return the font for this text node
*/
public Font getFont() {
return font;
}
/**
* Set the font for this text node to font. Note that in
* Piccolo if you want to change the size of a text object it's often a
* better idea to scale the PText node instead of changing the font size to
* get that same effect. Using very large font sizes can slow performance.
*
*
* This is a bound property.
*
*
* @param font font for this text node
*/
public void setFont(final Font font) {
if (font == this.font) {
return;
}
final Font oldFont = this.font;
if (font == null) {
this.font = DEFAULT_FONT;
}
else {
this.font = font;
}
lines = null;
recomputeLayout();
invalidatePaint();
firePropertyChange(PROPERTY_CODE_FONT, PROPERTY_FONT, oldFont, this.font);
}
/**
* Compute the bounds of the text wrapped by this node. The text layout is
* wrapped based on the bounds of this node.
*/
public void recomputeLayout() {
final ArrayList linesList = new ArrayList();
double textWidth = 0;
double textHeight = 0;
if (text != null && text.length() > 0) {
final AttributedString atString = new AttributedString(text);
atString.addAttribute(TextAttribute.FONT, getFont());
final AttributedCharacterIterator itr = atString.getIterator();
final LineBreakMeasurer measurer = new LineBreakMeasurer(itr, PPaintContext.RENDER_QUALITY_HIGH_FRC);
final float availableWidth;
if (constrainWidthToTextWidth) {
availableWidth = Float.MAX_VALUE;
}
else {
availableWidth = (float) getWidth();
}
int nextLineBreakOffset = text.indexOf('\n');
if (nextLineBreakOffset == -1) {
nextLineBreakOffset = Integer.MAX_VALUE;
}
else {
nextLineBreakOffset++;
}
while (measurer.getPosition() < itr.getEndIndex()) {
final TextLayout aTextLayout = computeNextLayout(measurer, availableWidth, nextLineBreakOffset);
if (nextLineBreakOffset == measurer.getPosition()) {
nextLineBreakOffset = text.indexOf('\n', measurer.getPosition());
if (nextLineBreakOffset == -1) {
nextLineBreakOffset = Integer.MAX_VALUE;
}
else {
nextLineBreakOffset++;
}
}
linesList.add(aTextLayout);
textHeight += aTextLayout.getAscent();
textHeight += aTextLayout.getDescent() + aTextLayout.getLeading();
textWidth = Math.max(textWidth, aTextLayout.getAdvance());
}
}
lines = (TextLayout[]) linesList.toArray(EMPTY_TEXT_LAYOUT_ARRAY);
if (constrainWidthToTextWidth || constrainHeightToTextHeight) {
double newWidth = getWidth();
double newHeight = getHeight();
if (constrainWidthToTextWidth) {
newWidth = textWidth;
}
if (constrainHeightToTextHeight) {
newHeight = textHeight;
}
super.setBounds(getX(), getY(), newWidth, newHeight);
}
}
/**
* Compute the next layout using the specified line break measurer,
* available width, and next line break offset.
*
* @param lineBreakMeasurer line break measurer
* @param availableWidth available width
* @param nextLineBreakOffset next line break offset
* @return the next layout computed using the specified line break measurer,
* available width, and next line break offset
*/
protected TextLayout computeNextLayout(final LineBreakMeasurer lineBreakMeasurer, final float availableWidth,
final int nextLineBreakOffset) {
return lineBreakMeasurer.nextLayout(availableWidth, nextLineBreakOffset, false);
}
/**
* Paint greek with the specified paint context.
*
* @since 1.3
* @param paintContext paint context
*/
protected void paintGreek(final PPaintContext paintContext) {
// empty
}
/**
* Paint text with the specified paint context.
*
* @since 1.3
* @param paintContext paint context
*/
protected void paintText(final PPaintContext paintContext) {
final float x = (float) getX();
float y = (float) getY();
final float bottomY = (float) getHeight() + y;
final Graphics2D g2 = paintContext.getGraphics();
if (lines == null) {
recomputeLayout();
repaint();
return;
}
g2.setPaint(textPaint);
for (int i = 0; i < lines.length; i++) {
final TextLayout tl = lines[i];
y += tl.getAscent();
if (bottomY < y) {
return;
}
final float offset = (float) (getWidth() - tl.getAdvance()) * horizontalAlignment;
tl.draw(g2, x + offset, y);
y += tl.getDescent() + tl.getLeading();
}
}
/** {@inheritDoc} */
protected void paint(final PPaintContext paintContext) {
super.paint(paintContext);
if (textPaint == null) {
return;
}
final float screenFontSize = getFont().getSize() * (float) paintContext.getScale();
if (screenFontSize <= greekThreshold) {
paintGreek(paintContext);
}
paintText(paintContext);
}
/** {@inheritDoc} */
protected void internalUpdateBounds(final double x, final double y, final double width, final double height) {
recomputeLayout();
}
}
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