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java.desktop /
share /
classes /
javax /
swing /
text /
DefaultHighlighter.java
/*
* Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javax.swing.text;
import java.util.Vector;
import java.awt.*;
import javax.swing.plaf.*;
import javax.swing.*;
/**
* Implements the Highlighter interfaces. Implements a simple highlight
* painter that renders in a solid color.
*
* @author Timothy Prinzing
* @see Highlighter
*/
public class DefaultHighlighter extends LayeredHighlighter {
/**
* Creates a new DefaultHighlighther object.
*/
public DefaultHighlighter() {
drawsLayeredHighlights = true;
}
// ---- Highlighter methods ----------------------------------------------
/**
* Renders the highlights.
*
* @param g the graphics context
*/
public void paint(Graphics g) {
// PENDING(prinz) - should cull ranges not visible
int len = highlights.size();
for (int i = 0; i < len; i++) {
HighlightInfo info = highlights.elementAt(i);
if (!(info instanceof LayeredHighlightInfo)) {
// Avoid allocing unless we need it.
Rectangle a = component.getBounds();
Insets insets = component.getInsets();
a.x = insets.left;
a.y = insets.top;
a.width -= insets.left + insets.right;
a.height -= insets.top + insets.bottom;
for (; i < len; i++) {
info = highlights.elementAt(i);
if (!(info instanceof LayeredHighlightInfo)) {
Highlighter.HighlightPainter p = info.getPainter();
p.paint(g, info.getStartOffset(), info.getEndOffset(),
a, component);
}
}
}
}
}
/**
* Called when the UI is being installed into the
* interface of a JTextComponent. Installs the editor, and
* removes any existing highlights.
*
* @param c the editor component
* @see Highlighter#install
*/
public void install(JTextComponent c) {
component = c;
removeAllHighlights();
}
/**
* Called when the UI is being removed from the interface of
* a JTextComponent.
*
* @param c the component
* @see Highlighter#deinstall
*/
public void deinstall(JTextComponent c) {
component = null;
}
/**
* Adds a highlight to the view. Returns a tag that can be used
* to refer to the highlight.
*
* @param p0 the start offset of the range to highlight >= 0
* @param p1 the end offset of the range to highlight >= p0
* @param p the painter to use to actually render the highlight
* @return an object that can be used as a tag
* to refer to the highlight
* @exception BadLocationException if the specified location is invalid
*/
public Object addHighlight(int p0, int p1, Highlighter.HighlightPainter p) throws BadLocationException {
if (p0 < 0) {
throw new BadLocationException("Invalid start offset", p0);
}
if (p1 < p0) {
throw new BadLocationException("Invalid end offset", p1);
}
Document doc = component.getDocument();
HighlightInfo i = (getDrawsLayeredHighlights() &&
(p instanceof LayeredHighlighter.LayerPainter)) ?
new LayeredHighlightInfo() : new HighlightInfo();
i.painter = p;
i.p0 = doc.createPosition(p0);
i.p1 = doc.createPosition(p1);
highlights.addElement(i);
safeDamageRange(p0, p1);
return i;
}
/**
* Removes a highlight from the view.
*
* @param tag the reference to the highlight
*/
public void removeHighlight(Object tag) {
if (tag instanceof LayeredHighlightInfo) {
LayeredHighlightInfo lhi = (LayeredHighlightInfo)tag;
if (lhi.width > 0 && lhi.height > 0) {
component.repaint(lhi.x, lhi.y, lhi.width, lhi.height);
}
}
else {
HighlightInfo info = (HighlightInfo) tag;
safeDamageRange(info.p0, info.p1);
}
highlights.removeElement(tag);
}
/**
* Removes all highlights.
*/
public void removeAllHighlights() {
TextUI mapper = component.getUI();
if (getDrawsLayeredHighlights()) {
int len = highlights.size();
if (len != 0) {
int minX = 0;
int minY = 0;
int maxX = 0;
int maxY = 0;
int p0 = -1;
int p1 = -1;
for (int i = 0; i < len; i++) {
HighlightInfo hi = highlights.elementAt(i);
if (hi instanceof LayeredHighlightInfo) {
LayeredHighlightInfo info = (LayeredHighlightInfo)hi;
minX = Math.min(minX, info.x);
minY = Math.min(minY, info.y);
maxX = Math.max(maxX, info.x + info.width);
maxY = Math.max(maxY, info.y + info.height);
}
else {
if (p0 == -1) {
p0 = hi.p0.getOffset();
p1 = hi.p1.getOffset();
}
else {
p0 = Math.min(p0, hi.p0.getOffset());
p1 = Math.max(p1, hi.p1.getOffset());
}
}
}
if (minX != maxX && minY != maxY) {
component.repaint(minX, minY, maxX - minX, maxY - minY);
}
if (p0 != -1) {
try {
safeDamageRange(p0, p1);
} catch (BadLocationException e) {}
}
highlights.removeAllElements();
}
}
else if (mapper != null) {
int len = highlights.size();
if (len != 0) {
int p0 = Integer.MAX_VALUE;
int p1 = 0;
for (int i = 0; i < len; i++) {
HighlightInfo info = highlights.elementAt(i);
p0 = Math.min(p0, info.p0.getOffset());
p1 = Math.max(p1, info.p1.getOffset());
}
try {
safeDamageRange(p0, p1);
} catch (BadLocationException e) {}
highlights.removeAllElements();
}
}
}
/**
* Changes a highlight.
*
* @param tag the highlight tag
* @param p0 the beginning of the range >= 0
* @param p1 the end of the range >= p0
* @exception BadLocationException if the specified location is invalid
*/
public void changeHighlight(Object tag, int p0, int p1) throws BadLocationException {
if (p0 < 0) {
throw new BadLocationException("Invalid beginning of the range", p0);
}
if (p1 < p0) {
throw new BadLocationException("Invalid end of the range", p1);
}
Document doc = component.getDocument();
if (tag instanceof LayeredHighlightInfo) {
LayeredHighlightInfo lhi = (LayeredHighlightInfo)tag;
if (lhi.width > 0 && lhi.height > 0) {
component.repaint(lhi.x, lhi.y, lhi.width, lhi.height);
}
// Mark the highlights region as invalid, it will reset itself
// next time asked to paint.
lhi.width = lhi.height = 0;
lhi.p0 = doc.createPosition(p0);
lhi.p1 = doc.createPosition(p1);
safeDamageRange(Math.min(p0, p1), Math.max(p0, p1));
}
else {
HighlightInfo info = (HighlightInfo) tag;
int oldP0 = info.p0.getOffset();
int oldP1 = info.p1.getOffset();
if (p0 == oldP0) {
safeDamageRange(Math.min(oldP1, p1),
Math.max(oldP1, p1));
} else if (p1 == oldP1) {
safeDamageRange(Math.min(p0, oldP0),
Math.max(p0, oldP0));
} else {
safeDamageRange(oldP0, oldP1);
safeDamageRange(p0, p1);
}
info.p0 = doc.createPosition(p0);
info.p1 = doc.createPosition(p1);
}
}
/**
* Makes a copy of the highlights. Does not actually clone each highlight,
* but only makes references to them.
*
* @return the copy
* @see Highlighter#getHighlights
*/
public Highlighter.Highlight[] getHighlights() {
int size = highlights.size();
if (size == 0) {
return noHighlights;
}
Highlighter.Highlight[] h = new Highlighter.Highlight[size];
highlights.copyInto(h);
return h;
}
/**
* When leaf Views (such as LabelView) are rendering they should
* call into this method. If a highlight is in the given region it will
* be drawn immediately.
*
* @param g Graphics used to draw
* @param p0 starting offset of view
* @param p1 ending offset of view
* @param viewBounds Bounds of View
* @param editor JTextComponent
* @param view View instance being rendered
*/
public void paintLayeredHighlights(Graphics g, int p0, int p1,
Shape viewBounds,
JTextComponent editor, View view) {
for (int counter = highlights.size() - 1; counter >= 0; counter--) {
HighlightInfo tag = highlights.elementAt(counter);
if (tag instanceof LayeredHighlightInfo) {
LayeredHighlightInfo lhi = (LayeredHighlightInfo)tag;
int start = lhi.getStartOffset();
int end = lhi.getEndOffset();
if ((p0 < start && p1 > start) ||
(p0 >= start && p0 < end)) {
lhi.paintLayeredHighlights(g, p0, p1, viewBounds,
editor, view);
}
}
}
}
/**
* Queues damageRange() call into event dispatch thread
* to be sure that views are in consistent state.
*/
private void safeDamageRange(final Position p0, final Position p1) {
safeDamager.damageRange(p0, p1);
}
/**
* Queues damageRange() call into event dispatch thread
* to be sure that views are in consistent state.
*/
private void safeDamageRange(int a0, int a1) throws BadLocationException {
Document doc = component.getDocument();
safeDamageRange(doc.createPosition(a0), doc.createPosition(a1));
}
/**
* If true, highlights are drawn as the Views draw the text. That is
* the Views will call into <code>paintLayeredHighlight</code> which
* will result in a rectangle being drawn before the text is drawn
* (if the offsets are in a highlighted region that is). For this to
* work the painter supplied must be an instance of
* LayeredHighlightPainter.
* @param newValue the new value
*/
public void setDrawsLayeredHighlights(boolean newValue) {
drawsLayeredHighlights = newValue;
}
/**
* Return the draw layered highlights.
* @return the draw layered highlights
*/
public boolean getDrawsLayeredHighlights() {
return drawsLayeredHighlights;
}
// ---- member variables --------------------------------------------
private static final Highlighter.Highlight[] noHighlights =
new Highlighter.Highlight[0];
private Vector<HighlightInfo> highlights = new Vector<HighlightInfo>();
private JTextComponent component;
private boolean drawsLayeredHighlights;
private SafeDamager safeDamager = new SafeDamager();
/**
* Default implementation of LayeredHighlighter.LayerPainter that can
* be used for painting highlights.
* <p>
* As of 1.4 this field is final.
*/
public static final LayeredHighlighter.LayerPainter DefaultPainter = new DefaultHighlightPainter(null);
/**
* Simple highlight painter that fills a highlighted area with
* a solid color.
*/
public static class DefaultHighlightPainter extends LayeredHighlighter.LayerPainter {
/**
* Constructs a new highlight painter. If <code>c</code> is null,
* the JTextComponent will be queried for its selection color.
*
* @param c the color for the highlight
*/
public DefaultHighlightPainter(Color c) {
color = c;
}
/**
* Returns the color of the highlight.
*
* @return the color
*/
public Color getColor() {
return color;
}
// --- HighlightPainter methods ---------------------------------------
/**
* Paints a highlight.
*
* @param g the graphics context
* @param offs0 the starting model offset >= 0
* @param offs1 the ending model offset >= offs1
* @param bounds the bounding box for the highlight
* @param c the editor
*/
@SuppressWarnings("deprecation")
public void paint(Graphics g, int offs0, int offs1, Shape bounds, JTextComponent c) {
Rectangle alloc = bounds.getBounds();
try {
// --- determine locations ---
TextUI mapper = c.getUI();
Rectangle p0 = mapper.modelToView(c, offs0);
Rectangle p1 = mapper.modelToView(c, offs1);
// --- render ---
Color color = getColor();
if (color == null) {
g.setColor(c.getSelectionColor());
}
else {
g.setColor(color);
}
if (p0.y == p1.y) {
// same line, render a rectangle
Rectangle r = p0.union(p1);
g.fillRect(r.x, r.y, r.width, r.height);
} else {
// different lines
int p0ToMarginWidth = alloc.x + alloc.width - p0.x;
g.fillRect(p0.x, p0.y, p0ToMarginWidth, p0.height);
if ((p0.y + p0.height) != p1.y) {
g.fillRect(alloc.x, p0.y + p0.height, alloc.width,
p1.y - (p0.y + p0.height));
}
g.fillRect(alloc.x, p1.y, (p1.x - alloc.x), p1.height);
}
} catch (BadLocationException e) {
// can't render
}
}
// --- LayerPainter methods ----------------------------
/**
* Paints a portion of a highlight.
*
* @param g the graphics context
* @param offs0 the starting model offset >= 0
* @param offs1 the ending model offset >= offs1
* @param bounds the bounding box of the view, which is not
* necessarily the region to paint.
* @param c the editor
* @param view View painting for
* @return region drawing occurred in
*/
public Shape paintLayer(Graphics g, int offs0, int offs1,
Shape bounds, JTextComponent c, View view) {
Color color = getColor();
if (color == null) {
g.setColor(c.getSelectionColor());
}
else {
g.setColor(color);
}
Rectangle r;
if (offs0 == view.getStartOffset() &&
offs1 == view.getEndOffset()) {
// Contained in view, can just use bounds.
if (bounds instanceof Rectangle) {
r = (Rectangle) bounds;
}
else {
r = bounds.getBounds();
}
}
else {
// Should only render part of View.
try {
// --- determine locations ---
Shape shape = view.modelToView(offs0, Position.Bias.Forward,
offs1,Position.Bias.Backward,
bounds);
r = (shape instanceof Rectangle) ?
(Rectangle)shape : shape.getBounds();
} catch (BadLocationException e) {
// can't render
r = null;
}
}
if (r != null) {
// If we are asked to highlight, we should draw something even
// if the model-to-view projection is of zero width (6340106).
r.width = Math.max(r.width, 1);
g.fillRect(r.x, r.y, r.width, r.height);
}
return r;
}
private Color color;
}
class HighlightInfo implements Highlighter.Highlight {
public int getStartOffset() {
return p0.getOffset();
}
public int getEndOffset() {
return p1.getOffset();
}
public Highlighter.HighlightPainter getPainter() {
return painter;
}
Position p0;
Position p1;
Highlighter.HighlightPainter painter;
}
/**
* LayeredHighlightPainter is used when a drawsLayeredHighlights is
* true. It maintains a rectangle of the region to paint.
*/
class LayeredHighlightInfo extends HighlightInfo {
void union(Shape bounds) {
if (bounds == null)
return;
Rectangle alloc;
if (bounds instanceof Rectangle) {
alloc = (Rectangle)bounds;
}
else {
alloc = bounds.getBounds();
}
if (width == 0 || height == 0) {
x = alloc.x;
y = alloc.y;
width = alloc.width;
height = alloc.height;
}
else {
width = Math.max(x + width, alloc.x + alloc.width);
height = Math.max(y + height, alloc.y + alloc.height);
x = Math.min(x, alloc.x);
width -= x;
y = Math.min(y, alloc.y);
height -= y;
}
}
/**
* Restricts the region based on the receivers offsets and messages
* the painter to paint the region.
*/
void paintLayeredHighlights(Graphics g, int p0, int p1,
Shape viewBounds, JTextComponent editor,
View view) {
int start = getStartOffset();
int end = getEndOffset();
// Restrict the region to what we represent
p0 = Math.max(start, p0);
p1 = Math.min(end, p1);
// Paint the appropriate region using the painter and union
// the effected region with our bounds.
union(((LayeredHighlighter.LayerPainter)painter).paintLayer
(g, p0, p1, viewBounds, editor, view));
}
int x;
int y;
int width;
int height;
}
/**
* This class invokes <code>mapper.damageRange</code> in
* EventDispatchThread. The only one instance per Highlighter
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