/*
* @(#)TextAreaFigure.java
*
* Copyright (c) 1996-2010 The authors and contributors of JHotDraw.
* You may not use, copy or modify this file, except in compliance with the
* accompanying license terms.
*/
package org.jhotdraw.draw;
import org.jhotdraw.geom.Dimension2DDouble;
import org.jhotdraw.geom.Insets2D;
import javax.annotation.Nullable;
import org.jhotdraw.draw.tool.TextAreaEditingTool;
import org.jhotdraw.draw.tool.Tool;
import org.jhotdraw.draw.handle.Handle;
import org.jhotdraw.draw.handle.TextOverflowHandle;
import org.jhotdraw.draw.handle.FontSizeHandle;
import org.jhotdraw.util.*;
import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.text.*;
import java.util.*;
import java.io.*;
import static org.jhotdraw.draw.AttributeKeys.*;
import org.jhotdraw.xml.DOMInput;
import org.jhotdraw.xml.DOMOutput;
/**
* A {@code TextHolderFigure} which holds multiple lines of text in a
* rectangular area.
* <p>
* It automatically rearranges the text to fit its allocated display area,
* breaking the lines at word boundaries whenever possible.<br>
* The text can contain either LF or CRLF sequences to separate paragraphs,
* as well as tab characters for table like formatting and alignment.<br>
* Currently the tabs are distributed at regular intervals as determined by
* the TabSize property. Tabs align correctly with either fixed
* or variable fonts.<br>
* If, when resizing, the vertical size of the display box is not enough to
* display all the text, TextAreaFigure displays a dashed red line at the
* bottom of the figure to indicate there is hidden text.<br>
* TextAreFigure uses all standard attributes for the area Rectangle2D.Double,
* ie: FillColor, PenColor for the border, FontSize, FontStyle, and FontName,
* as well as four additional attributes LeftMargin, RightMargin, TopMargin,
* and TabSize.<br>
* <p>
* A DrawingEditor should provide the TextAreaCreationTool to create a TextAreaFigure.
* <p>
* FIXME - TextAreaFigure should not draw a rectangle on its own but rather
* rely on a decorator. We probably need a DecoratorConnector for this and we
* need a way to specify the inner bounds of the decorator. We also need a way
* to center the text of the TextAreaFigure verticaly and horizontaly.
*
* @author Eduardo Francos - InContext (original version),
* Werner Randelshofer (this derived version)
* @version $Id$
*/
public class TextAreaFigure extends AbstractAttributedDecoratedFigure implements TextHolderFigure {
private static final long serialVersionUID = 1L;
protected Rectangle2D.Double bounds = new Rectangle2D.Double();
protected boolean editable = true;
private static final BasicStroke dashes = new BasicStroke(1f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 0f, new float[]{4f, 4f}, 0f);
/**
* This is a cached value to improve the performance of method isTextOverflow();
*/
@Nullable private Boolean isTextOverflow;
/** Creates a new instance. */
public TextAreaFigure() {
this(ResourceBundleUtil.getBundle("org.jhotdraw.draw.Labels").
getString("TextFigure.defaultText"));
}
public TextAreaFigure(String text) {
setText(text);
}
// DRAWING
@Override
protected void drawText(Graphics2D g) {
if (getText() != null || isEditable()) {
Font font = getFont();
boolean isUnderlined = get(FONT_UNDERLINE);
Insets2D.Double insets = getInsets();
Rectangle2D.Double textRect = new Rectangle2D.Double(
bounds.x + insets.left,
bounds.y + insets.top,
bounds.width - insets.left - insets.right,
bounds.height - insets.top - insets.bottom);
float leftMargin = (float) textRect.x;
float rightMargin = (float) Math.max(leftMargin + 1, textRect.x + textRect.width + 1);
float verticalPos = (float) textRect.y;
float maxVerticalPos = (float) (textRect.y + textRect.height);
if (leftMargin < rightMargin) {
//float tabWidth = (float) (getTabSize() * g.getFontMetrics(font).charWidth('m'));
float tabWidth = (float) (getTabSize() * font.getStringBounds("m", getFontRenderContext()).getWidth());
float[] tabStops = new float[(int) (textRect.width / tabWidth)];
for (int i = 0; i < tabStops.length; i++) {
tabStops[i] = (float) (textRect.x + (int) (tabWidth * (i + 1)));
}
if (getText() != null) {
Shape savedClipArea = g.getClip();
g.clip(textRect);
String[] paragraphs = getText().split("\n");//Strings.split(getText(), '\n');
for (int i = 0; i < paragraphs.length; i++) {
if (paragraphs[i].length() == 0) {
paragraphs[i] = " ";
}
AttributedString as = new AttributedString(paragraphs[i]);
as.addAttribute(TextAttribute.FONT, font);
if (isUnderlined) {
as.addAttribute(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_LOW_ONE_PIXEL);
}
int tabCount = paragraphs[i].split("\t").length - 1;
Rectangle2D.Double paragraphBounds = drawParagraph(g, as.getIterator(), verticalPos, maxVerticalPos, leftMargin, rightMargin, tabStops, tabCount);
verticalPos = (float) (paragraphBounds.y + paragraphBounds.height);
if (verticalPos > maxVerticalPos) {
break;
}
}
g.setClip(savedClipArea);
}
}
}
}
/**
* Draws or measures a paragraph of text at the specified y location and
* the bounds of the paragraph.
*
* @param g Graphics object. This parameter is null, if we want to
* measure the size of the paragraph.
* @param styledText the text of the paragraph.
* @param verticalPos the top bound of the paragraph
* @param maxVerticalPos the bottom bound of the paragraph
* @param leftMargin the left bound of the paragraph
* @param rightMargin the right bound of the paragraph
* @param tabStops an array with tab stops
* @param tabCount the number of entries in tabStops which contain actual
* values
* @return Returns the actual bounds of the paragraph.
*/
private Rectangle2D.Double drawParagraph(@Nullable Graphics2D g, AttributedCharacterIterator styledText,
float verticalPos, float maxVerticalPos, float leftMargin, float rightMargin, float[] tabStops, int tabCount) {
// This method is based on the code sample given
// in the class comment of java.awt.font.LineBreakMeasurer,
// assume styledText is an AttributedCharacterIterator, and the number
// of tabs in styledText is tabCount
Rectangle2D.Double paragraphBounds = new Rectangle2D.Double(leftMargin, verticalPos, 0, 0);
int[] tabLocations = new int[tabCount + 1];
int i = 0;
for (char c = styledText.first(); c != AttributedCharacterIterator.DONE; c = styledText.next()) {
if (c == '\t') {
tabLocations[i++] = styledText.getIndex();
}
}
tabLocations[tabCount] = styledText.getEndIndex() - 1;
// Now tabLocations has an entry for every tab's offset in
// the text. For convenience, the last entry is tabLocations
// is the offset of the last character in the text.
LineBreakMeasurer measurer = new LineBreakMeasurer(styledText, getFontRenderContext());
int currentTab = 0;
while (measurer.getPosition() < styledText.getEndIndex() &&
verticalPos <= maxVerticalPos) {
// Lay out and draw each line. All segments on a line
// must be computed before any drawing can occur, since
// we must know the largest ascent on the line.
// TextLayouts are computed and stored in a List;
// their horizontal positions are stored in a parallel
// List.
// lineContainsText is true after first segment is drawn
boolean lineContainsText = false;
boolean lineComplete = false;
float maxAscent = 0, maxDescent = 0;
float horizontalPos = leftMargin;
LinkedList<TextLayout> layouts = new LinkedList<>();
LinkedList<Float> penPositions = new LinkedList<>();
int first = layouts.size();
while (!lineComplete && verticalPos <= maxVerticalPos) {
float wrappingWidth = rightMargin - horizontalPos;
TextLayout layout = null;
layout =
measurer.nextLayout(wrappingWidth,
tabLocations[currentTab] + 1,
lineContainsText);
// layout can be null if lineContainsText is true
if (layout != null) {
layouts.add(layout);
penPositions.add(horizontalPos);
horizontalPos += layout.getAdvance();
maxAscent = Math.max(maxAscent, layout.getAscent());
maxDescent = Math.max(maxDescent,
layout.getDescent() + layout.getLeading());
} else {
lineComplete = true;
}
lineContainsText = true;
if (measurer.getPosition() == tabLocations[currentTab] + 1) {
currentTab++;
}
if (measurer.getPosition() == styledText.getEndIndex()) {
lineComplete = true;
} else if (tabStops.length == 0 || horizontalPos >= tabStops[tabStops.length - 1]) {
lineComplete = true;
}
if (!lineComplete) {
// move to next tab stop
int j;
for (j = 0; horizontalPos >= tabStops[j]; j++) {
}
horizontalPos = tabStops[j];
}
}
// If there is only one layout element on the line, and we are
// drawing, then honor alignment
if (first == layouts.size() - 1 && g != null) {
switch (get(TEXT_ALIGNMENT)) {
case TRAILING:
penPositions.set(first, rightMargin - layouts.get(first).getVisibleAdvance() - 1);
break;
case CENTER:
penPositions.set(first, (rightMargin - 1 - leftMargin - layouts.get(first).getVisibleAdvance()) / 2 + leftMargin);
break;
case BLOCK:
// not supported
break;
case LEADING:
default:
break;
}
}
verticalPos += maxAscent;
Iterator<TextLayout> layoutEnum = layouts.iterator();
Iterator<Float> positionEnum = penPositions.iterator();
// now iterate through layouts and draw them
while (layoutEnum.hasNext()) {
TextLayout nextLayout = layoutEnum.next();
float nextPosition = positionEnum.next();
if (g != null) {
nextLayout.draw(g, nextPosition, verticalPos);
}
Rectangle2D layoutBounds = nextLayout.getBounds();
paragraphBounds.add(new Rectangle2D.Double(layoutBounds.getX() + nextPosition,
layoutBounds.getY() + verticalPos,
layoutBounds.getWidth(),
layoutBounds.getHeight()));
}
verticalPos += maxDescent;
}
return paragraphBounds;
}
@Override
protected void drawFill(Graphics2D g) {
g.fill(bounds);
}
@Override
protected void drawStroke(Graphics2D g) {
g.draw(bounds);
}
// SHAPE AND BOUNDS
@Override
public void setBounds(Point2D.Double anchor, Point2D.Double lead) {
bounds.x = Math.min(anchor.x, lead.x);
bounds.y = Math.min(anchor.y, lead.y);
bounds.width = Math.max(1, Math.abs(lead.x - anchor.x));
bounds.height = Math.max(1, Math.abs(lead.y - anchor.y));
}
@Override
public void transform(AffineTransform tx) {
Point2D.Double anchor = getStartPoint();
Point2D.Double lead = getEndPoint();
setBounds(
(Point2D.Double) tx.transform(anchor, anchor),
(Point2D.Double) tx.transform(lead, lead));
}
@Override
public boolean figureContains(Point2D.Double p) {
return bounds.contains(p);
}
@Override
public Rectangle2D.Double getBounds() {
return (Rectangle2D.Double) bounds.getBounds2D();
}
@Override
public void restoreTransformTo(Object geometry) {
Rectangle2D.Double r = (Rectangle2D.Double) geometry;
bounds.x = r.x;
bounds.y = r.y;
bounds.width = r.width;
bounds.height = r.height;
}
@Override
public Object getTransformRestoreData() {
return bounds.clone();
}
// ATTRIBUTES
/**
* Gets the text shown by the text figure.
*/
@Override
public String getText() {
return get(TEXT);
}
/**
* Returns the insets used to draw text.
*/
@Override
public Insets2D.Double getInsets() {
double sw = Math.ceil(get(STROKE_WIDTH) / 2);
Insets2D.Double insets = new Insets2D.Double(4, 4, 4, 4);
return new Insets2D.Double(insets.top + sw, insets.left + sw, insets.bottom + sw, insets.right + sw);
}
@Override
public double getBaseline() {
return getFont().getLineMetrics(getText(), getFontRenderContext()).getAscent() + getInsets().top;
}
@Override
public int getTabSize() {
return 8;
}
/**
* Sets the text shown by the text figure.
*/
@Override
public void setText(String newText) {
set(TEXT, newText);
}
@Override
public int getTextColumns() {
return (getText() == null) ? 4 : Math.max(getText().length(), 4);
}
@Override
public Font getFont() {
return AttributeKeys.getFont(this);
}
@Override
public Color getTextColor() {
return get(TEXT_COLOR);
}
@Override
public Color getFillColor() {
return get(FILL_COLOR);
}
@Override
public void setFontSize(float size) {
set(FONT_SIZE, new Double(size));
}
@Override
public float getFontSize() {
return get(FONT_SIZE).floatValue();
}
// EDITING
@Override
public boolean isEditable() {
return editable;
}
public void setEditable(boolean b) {
this.editable = b;
}
/**
* Returns a specialized tool for the given coordinate.
* <p>Returns null, if no specialized tool is available.
*/
@Override
public Tool getTool(Point2D.Double p) {
if (isEditable() && contains(p)) {
TextAreaEditingTool tool = new TextAreaEditingTool(this);
return tool;
}
return null;
}
@Override
public TextHolderFigure getLabelFor() {
return this;
}
// CONNECTING
// COMPOSITE FIGURES
// CLONING
@Override
public TextAreaFigure clone() {
TextAreaFigure that = (TextAreaFigure) super.clone();
that.bounds = (Rectangle2D.Double) this.bounds.clone();
return that;
}
// EVENT HANDLING
@Override
public Collection<Handle> createHandles(int detailLevel) {
LinkedList<Handle> handles = (LinkedList<Handle>) super.createHandles(detailLevel);
if (detailLevel == 0) {
handles.add(new FontSizeHandle(this));
handles.add(new TextOverflowHandle(this));
}
return handles;
}
protected void readBounds(DOMInput in) throws IOException {
bounds.x = in.getAttribute("x", 0d);
bounds.y = in.getAttribute("y", 0d);
bounds.width = in.getAttribute("w", 0d);
bounds.height = in.getAttribute("h", 0d);
}
protected void writeBounds(DOMOutput out) throws IOException {
out.addAttribute("x", bounds.x);
out.addAttribute("y", bounds.y);
out.addAttribute("w", bounds.width);
out.addAttribute("h", bounds.height);
}
@Override
public void read(DOMInput in) throws IOException {
readBounds(in);
readAttributes(in);
}
@Override
public void write(DOMOutput out) throws IOException {
writeBounds(out);
writeAttributes(out);
}
@Override
public void invalidate() {
super.invalidate();
isTextOverflow = null;
}
@Override
public boolean isTextOverflow() {
if (isTextOverflow == null) {
Insets2D.Double insets = getInsets();
isTextOverflow = getPreferredTextSize(getBounds().width - insets.left - insets.right).height > getBounds().height - insets.top - insets.bottom;
}
return isTextOverflow;
}
/**
* Returns the preferred text size of the TextAreaFigure.
* <p>
* If you want to use this method to determine the bounds of the TextAreaFigure,
* you need to add the insets of the TextAreaFigure to the size.
*
* @param maxWidth the maximal width to use. Specify Double.MAX_VALUE
* if you want the width to be unlimited.
* @return width and height needed to lay out the text.
*/
public Dimension2DDouble getPreferredTextSize(double maxWidth) {
Rectangle2D.Double textRect = new Rectangle2D.Double();
if (getText() != null) {
Font font = getFont();
boolean isUnderlined = get(FONT_UNDERLINE);
float leftMargin = 0;
float rightMargin = (float) maxWidth - 1;
float verticalPos = 0;
float maxVerticalPos = Float.MAX_VALUE;
if (leftMargin < rightMargin) {
float tabWidth = (float) (getTabSize() * font.getStringBounds("m", getFontRenderContext()).getWidth());
float[] tabStops = new float[(int) (textRect.width / tabWidth)];
for (int i = 0; i < tabStops.length; i++) {
tabStops[i] = (float) (textRect.x + (int) (tabWidth * (i + 1)));
}
String[] paragraphs = getText().split("\n");//Strings.split(getText(), '\n');
for (int i = 0; i < paragraphs.length; i++) {
if (paragraphs[i].length() == 0) {
paragraphs[i] = " ";
}
AttributedString as = new AttributedString(paragraphs[i]);
as.addAttribute(TextAttribute.FONT, font);
if (isUnderlined) {
as.addAttribute(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_LOW_ONE_PIXEL);
}
int tabCount = paragraphs[i].split("\t").length - 1;
Rectangle2D.Double paragraphBounds = drawParagraph(null, as.getIterator(), verticalPos, maxVerticalPos, leftMargin, rightMargin, tabStops, tabCount);
verticalPos = (float) (paragraphBounds.y + paragraphBounds.height);
textRect.add(paragraphBounds);
}
}
}
return new Dimension2DDouble(-Math.min(textRect.x, 0) + textRect.width, -Math.min(textRect.y, 0) + textRect.height);
}
}