Another Link button
/**
* $ $ License.
*
* Copyright $ L2FProd.com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.awt.AlphaComposite;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Cursor;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.AbstractButton;
import javax.swing.Action;
import javax.swing.ButtonModel;
import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JToolBar;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.basic.BasicButtonUI;
import javax.swing.plaf.basic.BasicGraphicsUtils;
import javax.swing.plaf.basic.BasicHTML;
import javax.swing.text.View;
/**
* A button targeted to be used as an hyperlink. Most UI will make it
* transparent and it will react on mouse over by changing the cursor to the
* hand cursor.
*
* @javabean.class name="JLinkButton" shortDescription="A button looking as an
* hyperlink." stopClass="java.awt.Component"
*
* @javabean.attribute name="isContainer" value="Boolean.FALSE" rtexpr="true"
*
* @javabean.icons mono16="JLinkButton16-mono.gif" color16="JLinkButton16.gif"
* mono32="JLinkButton32-mono.gif" color32="JLinkButton32.gif"
*/
public class AnotherLinkButton extends JButton {
public AnotherLinkButton() {
super();
}
public AnotherLinkButton(String text) {
super(text);
}
public AnotherLinkButton(String text, Icon icon) {
super(text, icon);
}
public AnotherLinkButton(Action a) {
super(a);
}
public AnotherLinkButton(Icon icon) {
super(icon);
}
public void updateUI() {
setUI(new WindowsLinkButtonUI());
}
public static void main(String[] args) throws Exception {
JFrame frame = new JFrame("JLinkButton");
frame.getContentPane().setLayout(new BorderLayout());
frame.getContentPane().add("Center", new AnotherLinkButton("www.java2s.com"));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocation(100, 100);
frame.setVisible(true);
}
}
class BasicLinkButtonUI extends BasicButtonUI {
public static ComponentUI createUI(JComponent c) {
return new BasicLinkButtonUI();
}
private static Rectangle viewRect = new Rectangle();
private static Rectangle textRect = new Rectangle();
private static Rectangle iconRect = new Rectangle();
private static MouseListener handCursorListener = new HandCursor();
protected int dashedRectGapX;
protected int dashedRectGapY;
protected int dashedRectGapWidth;
protected int dashedRectGapHeight;
private Color focusColor;
protected void installDefaults(AbstractButton b) {
super.installDefaults(b);
b.setOpaque(false);
b.setBorderPainted(false);
b.setRolloverEnabled(true);
dashedRectGapX = UIManager.getInt("ButtonUI.dashedRectGapX");
dashedRectGapY = UIManager.getInt("ButtonUI.dashedRectGapY");
dashedRectGapWidth = UIManager.getInt("ButtonUI.dashedRectGapWidth");
dashedRectGapHeight = UIManager.getInt("ButtonUI.dashedRectGapHeight");
focusColor = UIManager.getColor("ButtonUI.focus");
b.setHorizontalAlignment(AbstractButton.LEFT);
}
protected void installListeners(AbstractButton b) {
super.installListeners(b);
b.addMouseListener(handCursorListener);
}
protected void uninstallListeners(AbstractButton b) {
super.uninstallListeners(b);
b.removeMouseListener(handCursorListener);
}
protected Color getFocusColor() {
return focusColor;
}
public void paint(Graphics g, JComponent c) {
AbstractButton b = (AbstractButton) c;
ButtonModel model = b.getModel();
FontMetrics fm = g.getFontMetrics();
Insets i = c.getInsets();
viewRect.x = i.left;
viewRect.y = i.top;
viewRect.width = b.getWidth() - (i.right + viewRect.x);
viewRect.height = b.getHeight() - (i.bottom + viewRect.y);
textRect.x = textRect.y = textRect.width = textRect.height = 0;
iconRect.x = iconRect.y = iconRect.width = iconRect.height = 0;
Font f = c.getFont();
g.setFont(f);
// layout the text and icon
String text = SwingUtilities.layoutCompoundLabel(c, fm, b.getText(), b
.getIcon(), b.getVerticalAlignment(), b
.getHorizontalAlignment(), b.getVerticalTextPosition(), b
.getHorizontalTextPosition(), viewRect, iconRect, textRect, b
.getText() == null ? 0 : b.getIconTextGap());
clearTextShiftOffset();
// perform UI specific press action, e.g. Windows L&F shifts text
if (model.isArmed() && model.isPressed()) {
paintButtonPressed(g, b);
}
// Paint the Icon
if (b.getIcon() != null) {
paintIcon(g, c, iconRect);
}
Composite oldComposite = ((Graphics2D) g).getComposite();
if (model.isRollover()) {
((Graphics2D) g).setComposite(AlphaComposite.getInstance(
AlphaComposite.SRC_OVER, 0.5f));
}
if (text != null && !text.equals("")) {
View v = (View) c.getClientProperty(BasicHTML.propertyKey);
if (v != null) {
textRect.x += getTextShiftOffset();
textRect.y += getTextShiftOffset();
v.paint(g, textRect);
textRect.x -= getTextShiftOffset();
textRect.y -= getTextShiftOffset();
} else {
paintText(g, b, textRect, text);
}
}
if (b.isFocusPainted() && b.hasFocus()) {
// paint UI specific focus
paintFocus(g, b, viewRect, textRect, iconRect);
}
((Graphics2D) g).setComposite(oldComposite);
}
protected void paintFocus(Graphics g, AbstractButton b, Rectangle viewRect,
Rectangle textRect, Rectangle iconRect) {
if (b.getParent() instanceof JToolBar) {
// Windows doesn't draw the focus rect for buttons in a toolbar.
return;
}
// focus painted same color as text
int width = b.getWidth();
int height = b.getHeight();
g.setColor(getFocusColor());
BasicGraphicsUtils.drawDashedRect(g, dashedRectGapX, dashedRectGapY,
width - dashedRectGapWidth, height - dashedRectGapHeight);
}
protected void paintButtonPressed(Graphics g, AbstractButton b) {
setTextShiftOffset();
}
static class HandCursor extends MouseAdapter {
public void mouseEntered(MouseEvent e) {
e.getComponent().setCursor(
Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
}
public void mouseExited(MouseEvent e) {
e.getComponent().setCursor(Cursor.getDefaultCursor());
}
}
}
class WindowsLinkButtonUI extends BasicLinkButtonUI {
private static WindowsLinkButtonUI buttonUI = new WindowsLinkButtonUI();
public static ComponentUI createUI(JComponent c) {
return buttonUI;
}
protected void paintButtonPressed(Graphics g, AbstractButton b) {
setTextShiftOffset();
}
}
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