com.jgoodies.common.internal.RenderingUtils Maven / Gradle / Ivy
Show all versions of jgoodies-common Show documentation
/*
* Copyright (c) 2009-2012 JGoodies Karsten Lentzsch. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* o 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.
*
* o Neither the name of JGoodies Karsten Lentzsch nor 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 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jgoodies.common.internal;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsDevice;
import java.awt.PrintGraphics;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.print.PrinterGraphics;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.swing.JComponent;
import javax.swing.plaf.basic.BasicGraphicsUtils;
/**
* Provides convenience behavior for drawing strings, underline chars,
* and accessing font metrics.
*
* Note: This class is not part of the public
* JGoodies Common API.
* It should be treated as library internal and should not be used by
* API users. It may be removed or changed without further notice.
*
* @author Karsten Lentzsch
* @version $Revision: 1.2 $
*/
public final class RenderingUtils {
private static final String PROP_DESKTOPHINTS = "awt.font.desktophints";
private static final String SWING_UTILITIES2_NAME = "sun.swing.SwingUtilities2";
/**
* Holds the public static method {@code SwingUtilities2#drawString}.
*/
private static Method drawStringMethod = null;
/**
* Holds the public static method
* {@code SwingUtilities2#drawStringUnderlinedAt}.
*/
private static Method drawStringUnderlineCharAtMethod = null;
/**
* Holds the public static method {@code SwingUtilities2#getFontMetrics}.
*/
private static Method getFontMetricsMethod = null;
static {
drawStringMethod = getMethodDrawString();
drawStringUnderlineCharAtMethod = getMethodDrawStringUnderlineCharAt();
getFontMetricsMethod = getMethodGetFontMetrics();
}
private RenderingUtils() {
// Overrides default constructor; prevents instantiation.
}
/**
* Draws the string at the specified location underlining the specified
* character.
*
* @param c JComponent that will display the string, may be null
* @param g Graphics to draw the text to
* @param text String to display
* @param x X coordinate to draw the text at
* @param y Y coordinate to draw the text at
*/
public static void drawString(JComponent c, Graphics g, String text, int x, int y) {
if (drawStringMethod != null) {
try {
drawStringMethod.invoke(null,
c, g, text, Integer.valueOf(x), Integer.valueOf(y));
return;
} catch (IllegalArgumentException e) {
// Use the BasicGraphicsUtils as fallback
} catch (IllegalAccessException e) {
// Use the BasicGraphicsUtils as fallback
} catch (InvocationTargetException e) {
// Use the BasicGraphicsUtils as fallback
}
}
Graphics2D g2 = (Graphics2D) g;
Map oldRenderingHints = installDesktopHints(g2);
BasicGraphicsUtils.drawStringUnderlineCharAt(g, text, -1, x, y);
if (oldRenderingHints != null) {
g2.addRenderingHints(oldRenderingHints);
}
}
/**
* Draws the string at the specified location underlining the specified
* character.
*
* @param c JComponent that will display the string, may be null
* @param g Graphics to draw the text to
* @param text String to display
* @param underlinedIndex Index of a character in the string to underline
* @param x X coordinate to draw the text at
* @param y Y coordinate to draw the text at
*/
public static void drawStringUnderlineCharAt(JComponent c, Graphics g,
String text, int underlinedIndex, int x, int y) {
if (drawStringUnderlineCharAtMethod != null) {
try {
drawStringUnderlineCharAtMethod.invoke(null,
new Object[] {c, g, text, new Integer(underlinedIndex),
new Integer(x), new Integer(y)});
return;
} catch (IllegalArgumentException e) {
// Use the BasicGraphicsUtils as fallback
} catch (IllegalAccessException e) {
// Use the BasicGraphicsUtils as fallback
} catch (InvocationTargetException e) {
// Use the BasicGraphicsUtils as fallback
}
}
Graphics2D g2 = (Graphics2D) g;
Map oldRenderingHints = installDesktopHints(g2);
BasicGraphicsUtils.drawStringUnderlineCharAt(g, text, underlinedIndex, x, y);
if (oldRenderingHints != null) {
g2.addRenderingHints(oldRenderingHints);
}
}
/**
* Returns the FontMetrics for the current Font of the passed
* in Graphics. This method is used when a Graphics
* is available, typically when painting. If a Graphics is not
* available the JComponent method of the same name should be used.
*
* Callers should pass in a non-null JComponent, the exception
* to this is if a JComponent is not readily available at the time of
* painting.
*
* This does not necessarily return the FontMetrics from the
* Graphics.
*
* @param c JComponent requesting FontMetrics, may be null
* @param g Graphics Graphics
* @return the FontMetrics
*/
public static FontMetrics getFontMetrics(JComponent c, Graphics g) {
if (getFontMetricsMethod != null) {
try {
return (FontMetrics) getFontMetricsMethod.invoke(null, new Object[] {c, g});
} catch (IllegalArgumentException e) {
// Use the fallback
} catch (IllegalAccessException e) {
// Use the fallback
} catch (InvocationTargetException e) {
// Use the fallback
}
}
return c.getFontMetrics(g.getFont());
}
// Private Helper Code ****************************************************
private static Method getMethodDrawString() {
try {
Class clazz = Class.forName(SWING_UTILITIES2_NAME);
return clazz.getMethod(
"drawString",
new Class[] {JComponent.class, Graphics.class, String.class, Integer.TYPE, Integer.TYPE}
);
} catch (ClassNotFoundException e) {
// returns null
} catch (SecurityException e) {
// returns null
} catch (NoSuchMethodException e) {
// returns null
}
return null;
}
private static Method getMethodDrawStringUnderlineCharAt() {
try {
Class clazz = Class.forName(SWING_UTILITIES2_NAME);
return clazz.getMethod(
"drawStringUnderlineCharAt",
new Class[] {JComponent.class, Graphics.class, String.class, Integer.TYPE, Integer.TYPE, Integer.TYPE}
);
} catch (ClassNotFoundException e) {
// returns null
} catch (SecurityException e) {
// returns null
} catch (NoSuchMethodException e) {
// returns null
}
return null;
}
private static Method getMethodGetFontMetrics() {
try {
Class clazz = Class.forName(SWING_UTILITIES2_NAME);
return clazz.getMethod(
"getFontMetrics",
new Class[] {JComponent.class, Graphics.class}
);
} catch (ClassNotFoundException e) {
// returns null
} catch (SecurityException e) {
// returns null
} catch (NoSuchMethodException e) {
// returns null
}
return null;
}
private static Map installDesktopHints(Graphics2D g2) {
Map oldRenderingHints = null;
Map desktopHints = desktopHints(g2);
if (desktopHints != null && !desktopHints.isEmpty()) {
oldRenderingHints = new HashMap(desktopHints.size());
RenderingHints.Key key;
for (Iterator i = desktopHints.keySet().iterator(); i.hasNext();) {
key = (RenderingHints.Key) i.next();
oldRenderingHints.put(key, g2.getRenderingHint(key));
}
g2.addRenderingHints(desktopHints);
}
return oldRenderingHints;
}
private static Map desktopHints(Graphics2D g2) {
if (isPrinting(g2)) {
return null;
}
Toolkit toolkit = Toolkit.getDefaultToolkit();
GraphicsDevice device = g2.getDeviceConfiguration().getDevice();
Map desktopHints = (Map) toolkit.getDesktopProperty(
PROP_DESKTOPHINTS + '.' + device.getIDstring());
if (desktopHints == null) {
desktopHints = (Map) toolkit.getDesktopProperty(PROP_DESKTOPHINTS);
}
// It is possible to get a non-empty map but with disabled AA.
if (desktopHints != null) {
Object aaHint = desktopHints.get(RenderingHints.KEY_TEXT_ANTIALIASING);
if (aaHint == RenderingHints.VALUE_TEXT_ANTIALIAS_OFF ||
aaHint == RenderingHints.VALUE_TEXT_ANTIALIAS_DEFAULT) {
desktopHints = null;
}
}
return desktopHints;
}
private static boolean isPrinting(Graphics g) {
return g instanceof PrintGraphics || g instanceof PrinterGraphics;
}
}