Java/Swing Components/Link Button

Another Link button

   <source lang="java">

/**

* $ $ License.
*
* Copyright $ L2FProd.ru
*
* 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.ruposite; 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.ruponentUI; 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.ruponent"
* 
* @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.jexp.ru"));
   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();
 }

}

      </source>
   
  
 
  

LinkButton

   <source lang="java">

import java.awt.Color; import java.awt.Cursor; import java.awt.FontMetrics; import java.awt.Graphics; import java.awt.GridLayout; import java.awt.Rectangle; import java.net.URL; 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.UIManager; import javax.swing.plaf.ruponentUI; import javax.swing.plaf.metal.MetalButtonUI; public class JLinkButton extends JButton {

 private static final String uiString = "LinkButtonUI";
 public static final int ALWAYS_UNDERLINE = 0;
 public static final int HOVER_UNDERLINE = 1;
 public static final int NEVER_UNDERLINE = 2;
 public static final int SYSTEM_DEFAULT = 3;
 private int linkBehavior;
 private Color linkColor;
 private Color colorPressed;
 private Color visitedLinkColor;
 private Color disabledLinkColor;
 private URL buttonURL;
 private Action defaultAction;
 private boolean isLinkVisited;
 public static void main(String[] a) {
   JFrame f = new JFrame();
   f.getContentPane().setLayout(new GridLayout(0,2));
   f.getContentPane().add(new JLinkButton("www.jexp.ru"));
   f.getContentPane().add(new JLinkButton("www.jexp.ru/ExampleCode/CatalogExampleCode.htm"));
   f.setSize(600, 200);
   f.setVisible(true);
 }
 public JLinkButton() {
   this(null, null, null);
 }
 public JLinkButton(Action action) {
   this();
   setAction(action);
 }
 public JLinkButton(Icon icon) {
   this(null, icon, null);
 }
 public JLinkButton(String s) {
   this(s, null, null);
 }
 public JLinkButton(URL url) {
   this(null, null, url);
 }
 public JLinkButton(String s, URL url) {
   this(s, null, url);
 }
 public JLinkButton(Icon icon, URL url) {
   this(null, icon, url);
 }
 public JLinkButton(String text, Icon icon, URL url) {
   super(text, icon);
   linkBehavior = SYSTEM_DEFAULT;
   linkColor = Color.blue;
   colorPressed = Color.red;
   visitedLinkColor = new Color(128, 0, 128);
   if (text == null && url != null)
     setText(url.toExternalForm());
   setLinkURL(url);
   setCursor(Cursor.getPredefinedCursor(12));
   setBorderPainted(false);
   setContentAreaFilled(false);
   setRolloverEnabled(true);
   addActionListener(defaultAction);
 }
 public void updateUI() {
   setUI(BasicLinkButtonUI.createUI(this));
 }
 private void setDefault() {
   UIManager.getDefaults().put("LinkButtonUI", "BasicLinkButtonUI");
 }
 public String getUIClassID() {
   return "LinkButtonUI";
 }
 protected void setupToolTipText() {
   String tip = null;
   if (buttonURL != null)
     tip = buttonURL.toExternalForm();
   setToolTipText(tip);
 }
 public void setLinkBehavior(int bnew) {
   checkLinkBehaviour(bnew);
   int old = linkBehavior;
   linkBehavior = bnew;
   firePropertyChange("linkBehavior", old, bnew);
   repaint();
 }
 private void checkLinkBehaviour(int beha) {
   if (beha != ALWAYS_UNDERLINE && beha != HOVER_UNDERLINE
       && beha != NEVER_UNDERLINE && beha != SYSTEM_DEFAULT)
     throw new IllegalArgumentException("Not a legal LinkBehavior");
   else
     return;
 }
 public int getLinkBehavior() {
   return linkBehavior;
 }
 public void setLinkColor(Color color) {
   Color colorOld = linkColor;
   linkColor = color;
   firePropertyChange("linkColor", colorOld, color);
   repaint();
 }
 public Color getLinkColor() {
   return linkColor;
 }
 public void setActiveLinkColor(Color colorNew) {
   Color colorOld = colorPressed;
   colorPressed = colorNew;
   firePropertyChange("activeLinkColor", colorOld, colorNew);
   repaint();
 }
 public Color getActiveLinkColor() {
   return colorPressed;
 }
 public void setDisabledLinkColor(Color color) {
   Color colorOld = disabledLinkColor;
   disabledLinkColor = color;
   firePropertyChange("disabledLinkColor", colorOld, color);
   if (!isEnabled())
     repaint();
 }
 public Color getDisabledLinkColor() {
   return disabledLinkColor;
 }
 public void setVisitedLinkColor(Color colorNew) {
   Color colorOld = visitedLinkColor;
   visitedLinkColor = colorNew;
   firePropertyChange("visitedLinkColor", colorOld, colorNew);
   repaint();
 }
 public Color getVisitedLinkColor() {
   return visitedLinkColor;
 }
 public URL getLinkURL() {
   return buttonURL;
 }
 public void setLinkURL(URL url) {
   URL urlOld = buttonURL;
   buttonURL = url;
   setupToolTipText();
   firePropertyChange("linkURL", urlOld, url);
   revalidate();
   repaint();
 }
 public void setLinkVisited(boolean flagNew) {
   boolean flagOld = isLinkVisited;
   isLinkVisited = flagNew;
   firePropertyChange("linkVisited", flagOld, flagNew);
   repaint();
 }
 public boolean isLinkVisited() {
   return isLinkVisited;
 }
 public void setDefaultAction(Action actionNew) {
   Action actionOld = defaultAction;
   defaultAction = actionNew;
   firePropertyChange("defaultAction", actionOld, actionNew);
 }
 public Action getDefaultAction() {
   return defaultAction;
 }
 protected String paramString() {
   String str;
   if (linkBehavior == ALWAYS_UNDERLINE)
     str = "ALWAYS_UNDERLINE";
   else if (linkBehavior == HOVER_UNDERLINE)
     str = "HOVER_UNDERLINE";
   else if (linkBehavior == NEVER_UNDERLINE)
     str = "NEVER_UNDERLINE";
   else
     str = "SYSTEM_DEFAULT";
   String colorStr = linkColor == null ? "" : linkColor.toString();
   String colorPressStr = colorPressed == null ? "" : colorPressed
       .toString();
   String disabledLinkColorStr = disabledLinkColor == null ? ""
       : disabledLinkColor.toString();
   String visitedLinkColorStr = visitedLinkColor == null ? ""
       : visitedLinkColor.toString();
   String buttonURLStr = buttonURL == null ? "" : buttonURL.toString();
   String isLinkVisitedStr = isLinkVisited ? "true" : "false";
   return super.paramString() + ",linkBehavior=" + str + ",linkURL="
       + buttonURLStr + ",linkColor=" + colorStr + ",activeLinkColor="
       + colorPressStr + ",disabledLinkColor=" + disabledLinkColorStr
       + ",visitedLinkColor=" + visitedLinkColorStr
       + ",linkvisitedString=" + isLinkVisitedStr;
 }

} class BasicLinkButtonUI extends MetalButtonUI {

 private static final BasicLinkButtonUI ui = new BasicLinkButtonUI();
 public BasicLinkButtonUI() {
 }
 public static ComponentUI createUI(JComponent jcomponent) {
   return ui;
 }
 protected void paintText(Graphics g, JComponent com, Rectangle rect,
     String s) {
   JLinkButton bn = (JLinkButton) com;
   ButtonModel bnModel = bn.getModel();
   Color color = bn.getForeground();
   Object obj = null;
   if (bnModel.isEnabled()) {
     if (bnModel.isPressed())
       bn.setForeground(bn.getActiveLinkColor());
     else if (bn.isLinkVisited())
       bn.setForeground(bn.getVisitedLinkColor());
     else
       bn.setForeground(bn.getLinkColor());
   } else {
     if (bn.getDisabledLinkColor() != null)
       bn.setForeground(bn.getDisabledLinkColor());
   }
   super.paintText(g, com, rect, s);
   int behaviour = bn.getLinkBehavior();
   boolean drawLine = false;
   if (behaviour == JLinkButton.HOVER_UNDERLINE) {
     if (bnModel.isRollover())
       drawLine = true;
   } else if (behaviour == JLinkButton.ALWAYS_UNDERLINE || behaviour == JLinkButton.SYSTEM_DEFAULT)
     drawLine = true;
   if (!drawLine)
     return;
   FontMetrics fm = g.getFontMetrics();
   int x = rect.x + getTextShiftOffset();
   int y = (rect.y + fm.getAscent() + fm.getDescent() + getTextShiftOffset()) - 1;
   if (bnModel.isEnabled()) {
     g.setColor(bn.getForeground());
     g.drawLine(x, y, (x + rect.width) - 1, y);
   } else {
     g.setColor(bn.getBackground().brighter());
     g.drawLine(x, y, (x + rect.width) - 1, y);
   }
 }

}

      </source>