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+/* BasicLabelUI.java
+ Copyright (C) 2002, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+package javax.swing.plaf.basic;
+
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Font;
+import java.awt.FontMetrics;
+import java.awt.Graphics;
+import java.awt.Insets;
+import java.awt.Rectangle;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+
+import javax.swing.Icon;
+import javax.swing.JComponent;
+import javax.swing.JLabel;
+import javax.swing.SwingUtilities;
+import javax.swing.UIDefaults;
+import javax.swing.UIManager;
+import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.LabelUI;
+
+
+/**
+ * This is the Basic Look and Feel class for the JLabel. One BasicLabelUI
+ * object is used to paint all JLabels that utilize the Basic Look and Feel.
+ */
+public class BasicLabelUI extends LabelUI implements PropertyChangeListener
+{
+ /** The labelUI that is shared by all labels. */
+ protected static BasicLabelUI labelUI;
+
+ /**
+ * Creates a new BasicLabelUI object.
+ */
+ public BasicLabelUI()
+ {
+ super();
+ }
+
+ /**
+ * Creates and returns a UI for the label. Since one UI is shared by all
+ * labels, this means creating only if necessary and returning the shared
+ * UI.
+ *
+ * @param c The {@link JComponent} that a UI is being created for.
+ *
+ * @return A label UI for the Basic Look and Feel.
+ */
+ public static ComponentUI createUI(JComponent c)
+ {
+ if (labelUI == null)
+ labelUI = new BasicLabelUI();
+ return labelUI;
+ }
+
+ /**
+ * Returns the preferred size of this component as calculated by the
+ * {@link #layoutCL(JLabel, FontMetrics, String, Icon, Rectangle, Rectangle,
+ * Rectangle)} method.
+ *
+ * @param c This {@link JComponent} to get a preferred size for.
+ *
+ * @return The preferred size.
+ */
+ public Dimension getPreferredSize(JComponent c)
+ {
+ JLabel lab = (JLabel)c;
+ Rectangle vr = new Rectangle();
+ Rectangle ir = new Rectangle();
+ Rectangle tr = new Rectangle();
+ Insets insets = lab.getInsets();
+ FontMetrics fm = lab.getToolkit().getFontMetrics(lab.getFont());
+ layoutCL(lab, fm, lab.getText(), lab.getIcon(), vr, ir, tr);
+ Rectangle cr = tr.union(ir);
+ return new Dimension(insets.left + cr.width + insets.right,
+ insets.top + cr.height + insets.bottom);
+
+ }
+
+ /**
+ * This method returns the minimum size of the {@link JComponent} given. If
+ * this method returns null, then it is up to the Layout Manager to give
+ * this component a minimum size.
+ *
+ * @param c The {@link JComponent} to get a minimum size for.
+ *
+ * @return The minimum size.
+ */
+ public Dimension getMinimumSize(JComponent c)
+ {
+ return getPreferredSize(c);
+ }
+
+ /**
+ * This method returns the maximum size of the {@link JComponent} given. If
+ * this method returns null, then it is up to the Layout Manager to give
+ * this component a maximum size.
+ *
+ * @param c The {@link JComponent} to get a maximum size for.
+ *
+ * @return The maximum size.
+ */
+ public Dimension getMaximumSize(JComponent c)
+ {
+ return getPreferredSize(c);
+ }
+
+ /**
+ * The method that paints the label according to its current state.
+ *
+ * @param g The {@link Graphics} object to paint with.
+ * @param c The {@link JComponent} to paint.
+ */
+ public void paint(Graphics g, JComponent c)
+ {
+ JLabel b = (JLabel) c;
+
+ Font saved_font = g.getFont();
+
+ Rectangle tr = new Rectangle();
+ Rectangle ir = new Rectangle();
+ Rectangle vr = new Rectangle();
+
+ Font f = c.getFont();
+
+ g.setFont(f);
+ FontMetrics fm = g.getFontMetrics(f);
+
+ vr = SwingUtilities.calculateInnerArea(c, vr);
+
+ if (vr.width < 0)
+ vr.width = 0;
+ if (vr.height < 0)
+ vr.height = 0;
+
+ Icon icon = (b.isEnabled()) ? b.getIcon() : b.getDisabledIcon();
+
+ String text = layoutCL(b, fm, b.getText(), icon, vr, ir, tr);
+
+ if (icon != null)
+ icon.paintIcon(b, g, ir.x, ir.y);
+ if (text != null && ! text.equals(""))
+ {
+ if (b.isEnabled())
+ paintEnabledText(b, g, text, tr.x, tr.y + fm.getAscent());
+ else
+ paintDisabledText(b, g, text, tr.x, tr.y + fm.getAscent());
+ }
+ g.setFont(saved_font);
+ }
+
+ /**
+ * This method is simply calls SwingUtilities's layoutCompoundLabel.
+ *
+ * @param label The label to lay out.
+ * @param fontMetrics The FontMetrics for the font used.
+ * @param text The text to paint.
+ * @param icon The icon to draw.
+ * @param viewR The entire viewable rectangle.
+ * @param iconR The icon bounds rectangle.
+ * @param textR The text bounds rectangle.
+ *
+ * @return A possibly clipped version of the text.
+ */
+ protected String layoutCL(JLabel label, FontMetrics fontMetrics,
+ String text, Icon icon, Rectangle viewR,
+ Rectangle iconR, Rectangle textR)
+ {
+ return SwingUtilities.layoutCompoundLabel(label, fontMetrics, text, icon,
+ label.getVerticalAlignment(),
+ label.getHorizontalAlignment(),
+ label.getVerticalTextPosition(),
+ label.getHorizontalTextPosition(),
+ viewR, iconR, textR,
+ label.getIconTextGap());
+ }
+
+ /**
+ * Paints the text if the label is disabled. By default, this paints the
+ * clipped text returned by layoutCompoundLabel using the
+ * background.brighter() color. It also paints the same text using the
+ * background.darker() color one pixel to the right and one pixel down.
+ *
+ * @param l The {@link JLabel} being painted.
+ * @param g The {@link Graphics} object to paint with.
+ * @param s The String to paint.
+ * @param textX The x coordinate of the start of the baseline.
+ * @param textY The y coordinate of the start of the baseline.
+ */
+ protected void paintDisabledText(JLabel l, Graphics g, String s, int textX,
+ int textY)
+ {
+ Color saved_color = g.getColor();
+
+ g.setColor(l.getBackground().brighter());
+
+ int mnemIndex = l.getDisplayedMnemonicIndex();
+
+ if (mnemIndex != -1)
+ BasicGraphicsUtils.drawStringUnderlineCharAt(g, s, mnemIndex, textX,
+ textY);
+ else
+ g.drawString(s, textX, textY);
+
+ g.setColor(l.getBackground().darker());
+ if (mnemIndex != -1)
+ BasicGraphicsUtils.drawStringUnderlineCharAt(g, s, mnemIndex, textX + 1,
+ textY + 1);
+ else
+ g.drawString(s, textX + 1, textY + 1);
+
+ g.setColor(saved_color);
+ }
+
+ /**
+ * Paints the text if the label is enabled. The text is painted using the
+ * foreground color.
+ *
+ * @param l The {@link JLabel} being painted.
+ * @param g The {@link Graphics} object to paint with.
+ * @param s The String to paint.
+ * @param textX The x coordinate of the start of the baseline.
+ * @param textY The y coordinate of the start of the baseline.
+ */
+ protected void paintEnabledText(JLabel l, Graphics g, String s, int textX,
+ int textY)
+ {
+ Color saved_color = g.getColor();
+ g.setColor(l.getForeground());
+
+ int mnemIndex = l.getDisplayedMnemonicIndex();
+
+ if (mnemIndex != -1)
+ BasicGraphicsUtils.drawStringUnderlineCharAt(g, s, mnemIndex, textX,
+ textY);
+ else
+ g.drawString(s, textX, textY);
+
+ g.setColor(saved_color);
+ }
+
+ /**
+ * This method installs the UI for the given {@link JComponent}. This
+ * method will install the component, defaults, listeners, and keyboard
+ * actions.
+ *
+ * @param c The {@link JComponent} that this UI is being installed on.
+ */
+ public void installUI(JComponent c)
+ {
+ super.installUI(c);
+ if (c instanceof JLabel)
+ {
+ JLabel l = (JLabel) c;
+
+ installComponents(l);
+ installDefaults(l);
+ installListeners(l);
+ installKeyboardActions(l);
+ }
+ }
+
+ /**
+ * This method uninstalls the UI for the given {@link JComponent}. This
+ * method will uninstall the component, defaults, listeners, and keyboard
+ * actions.
+ *
+ * @param c The {@link JComponent} that this UI is being installed on.
+ */
+ public void uninstallUI(JComponent c)
+ {
+ super.uninstallUI(c);
+ if (c instanceof JLabel)
+ {
+ JLabel l = (JLabel) c;
+
+ uninstallKeyboardActions(l);
+ uninstallListeners(l);
+ uninstallDefaults(l);
+ uninstallComponents(l);
+ }
+ }
+
+ /**
+ * This method installs the components for this {@link JLabel}.
+ *
+ * @param c The {@link JLabel} to install components for.
+ */
+ protected void installComponents(JLabel c)
+ {
+ //FIXME: fix javadoc + implement.
+ }
+
+ /**
+ * This method uninstalls the components for this {@link JLabel}.
+ *
+ * @param c The {@link JLabel} to uninstall components for.
+ */
+ protected void uninstallComponents(JLabel c)
+ {
+ //FIXME: fix javadoc + implement.
+ }
+
+ /**
+ * This method installs the defaults that are defined in the Basic look and
+ * feel for this {@link JLabel}.
+ *
+ * @param c The {@link JLabel} to install defaults for.
+ */
+ protected void installDefaults(JLabel c)
+ {
+ UIDefaults defaults = UIManager.getLookAndFeelDefaults();
+
+ c.setForeground(defaults.getColor("Label.foreground"));
+ c.setBackground(defaults.getColor("Label.background"));
+ c.setFont(defaults.getFont("Label.font"));
+ //XXX: There are properties we don't use called disabledForeground
+ //and disabledShadow.
+ }
+
+ /**
+ * This method uninstalls the defaults that are defined in the Basic look
+ * and feel for this {@link JLabel}.
+ *
+ * @param c The {@link JLabel} to uninstall defaults for.
+ */
+ protected void uninstallDefaults(JLabel c)
+ {
+ c.setForeground(null);
+ c.setBackground(null);
+ c.setFont(null);
+ }
+
+ /**
+ * This method installs the keyboard actions for the given {@link JLabel}.
+ *
+ * @param l The {@link JLabel} to install keyboard actions for.
+ */
+ protected void installKeyboardActions(JLabel l)
+ {
+ //FIXME: implement.
+ }
+
+ /**
+ * This method uninstalls the keyboard actions for the given {@link JLabel}.
+ *
+ * @param l The {@link JLabel} to uninstall keyboard actions for.
+ */
+ protected void uninstallKeyboardActions(JLabel l)
+ {
+ //FIXME: implement.
+ }
+
+ /**
+ * This method installs the listeners for the given {@link JLabel}. The UI
+ * delegate only listens to the label.
+ *
+ * @param c The {@link JLabel} to install listeners for.
+ */
+ protected void installListeners(JLabel c)
+ {
+ c.addPropertyChangeListener(this);
+ }
+
+ /**
+ * This method uninstalls the listeners for the given {@link JLabel}. The UI
+ * delegate only listens to the label.
+ *
+ * @param c The {@link JLabel} to uninstall listeners for.
+ */
+ protected void uninstallListeners(JLabel c)
+ {
+ c.removePropertyChangeListener(this);
+ }
+
+ /**
+ * This method is called whenever any JLabel's that use this UI has one of
+ * their properties change.
+ *
+ * @param e The {@link PropertyChangeEvent} that describes the change.
+ */
+ public void propertyChange(PropertyChangeEvent e)
+ {
+ JLabel c = (JLabel) e.getSource();
+ c.revalidate();
+ c.repaint();
+ }
+}
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