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+/* MetalScrollBarUI.java
+ Copyright (C) 2005, 2006, 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.metal;
+
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import java.awt.Insets;
+import java.awt.Rectangle;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+
+import javax.swing.JButton;
+import javax.swing.JComponent;
+import javax.swing.JScrollBar;
+import javax.swing.SwingConstants;
+import javax.swing.UIManager;
+import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.basic.BasicScrollBarUI;
+
+/**
+ * A UI delegate for the {@link JScrollBar} component.
+ */
+public class MetalScrollBarUI extends BasicScrollBarUI
+{
+
+ /**
+ * A property change handler for the UI delegate that monitors for
+ * changes to the "JScrollBar.isFreeStanding" property, and updates
+ * the buttons and track rendering as appropriate.
+ */
+ class MetalScrollBarPropertyChangeHandler
+ extends BasicScrollBarUI.PropertyChangeHandler
+ {
+ /**
+ * Creates a new handler.
+ *
+ * @see #createPropertyChangeListener()
+ */
+ public MetalScrollBarPropertyChangeHandler()
+ {
+ // Nothing to do here.
+ }
+
+ /**
+ * Handles a property change event. If the event name is
+ * <code>JSlider.isFreeStanding</code>, this method updates the
+ * delegate, otherwise the event is passed up to the super class.
+ *
+ * @param e the property change event.
+ */
+ public void propertyChange(PropertyChangeEvent e)
+ {
+ if (e.getPropertyName().equals(FREE_STANDING_PROP))
+ {
+ Boolean prop = (Boolean) e.getNewValue();
+ isFreeStanding = prop == null ? true : prop.booleanValue();
+ if (increaseButton != null)
+ increaseButton.setFreeStanding(isFreeStanding);
+ if (decreaseButton != null)
+ decreaseButton.setFreeStanding(isFreeStanding);
+ }
+ else
+ super.propertyChange(e);
+ }
+ }
+
+ /** The name for the 'free standing' property. */
+ public static final String FREE_STANDING_PROP = "JScrollBar.isFreeStanding";
+
+ /** The minimum thumb size for a scroll bar that is not free standing. */
+ private static final Dimension MIN_THUMB_SIZE = new Dimension(15, 15);
+
+ /** The minimum thumb size for a scroll bar that is free standing. */
+ private static final Dimension MIN_THUMB_SIZE_FREE_STANDING
+ = new Dimension(17, 17);
+
+ /** The button that increases the value in the scroll bar. */
+ protected MetalScrollButton increaseButton;
+
+ /** The button that decreases the value in the scroll bar. */
+ protected MetalScrollButton decreaseButton;
+
+ /**
+ * The scroll bar width.
+ */
+ protected int scrollBarWidth;
+
+ /**
+ * A flag that indicates whether the scroll bar is "free standing", which
+ * means it has complete borders and can be used anywhere in the UI. A
+ * scroll bar which is not free standing has borders missing from one
+ * side, and relies on being part of another container with its own borders
+ * to look right visually. */
+ protected boolean isFreeStanding = true;
+
+ /**
+ * The color for the scroll bar shadow (this is read from the UIDefaults in
+ * the installDefaults() method).
+ */
+ Color scrollBarShadowColor;
+
+ /**
+ * Constructs a new instance of <code>MetalScrollBarUI</code>, with no
+ * specific initialisation.
+ */
+ public MetalScrollBarUI()
+ {
+ super();
+ }
+
+ /**
+ * Returns a new instance of <code>MetalScrollBarUI</code>.
+ *
+ * @param component the component for which we return an UI instance
+ *
+ * @return An instance of MetalScrollBarUI
+ */
+ public static ComponentUI createUI(JComponent component)
+ {
+ return new MetalScrollBarUI();
+ }
+
+ /**
+ * Installs the defaults.
+ */
+ protected void installDefaults()
+ {
+ // need to initialise isFreeStanding before calling the super class,
+ // so that the value is set when createIncreaseButton() and
+ // createDecreaseButton() are called (unless there is somewhere earlier
+ // that we can do this).
+ Boolean prop = (Boolean) scrollbar.getClientProperty(FREE_STANDING_PROP);
+ isFreeStanding = prop == null ? true : prop.booleanValue();
+ scrollBarShadowColor = UIManager.getColor("ScrollBar.shadow");
+ scrollBarWidth = UIManager.getInt("ScrollBar.width");
+ super.installDefaults();
+ }
+
+ /**
+ * Creates a property change listener for the delegate to use. This
+ * overrides the method to provide a custom listener for the
+ * {@link MetalLookAndFeel} that can handle the
+ * <code>JScrollBar.isFreeStanding</code> property.
+ *
+ * @return A property change listener.
+ */
+ protected PropertyChangeListener createPropertyChangeListener()
+ {
+ return new MetalScrollBarPropertyChangeHandler();
+ }
+
+ /**
+ * Creates a new button to use as the control at the lower end of the
+ * {@link JScrollBar}. This method assigns the new button (an instance of
+ * {@link MetalScrollButton} to the {@link #decreaseButton} field, and also
+ * returns the button. The button width is determined by the
+ * <code>ScrollBar.width</code> setting in the UI defaults.
+ *
+ * @param orientation the orientation of the button ({@link #NORTH},
+ * {@link #SOUTH}, {@link #EAST} or {@link #WEST}).
+ *
+ * @return The button.
+ */
+ protected JButton createDecreaseButton(int orientation)
+ {
+ decreaseButton = new MetalScrollButton(orientation, scrollBarWidth,
+ isFreeStanding);
+ return decreaseButton;
+ }
+
+ /**
+ * Creates a new button to use as the control at the upper end of the
+ * {@link JScrollBar}. This method assigns the new button (an instance of
+ * {@link MetalScrollButton} to the {@link #increaseButton} field, and also
+ * returns the button. The button width is determined by the
+ * <code>ScrollBar.width</code> setting in the UI defaults.
+ *
+ * @param orientation the orientation of the button ({@link #NORTH},
+ * {@link #SOUTH}, {@link #EAST} or {@link #WEST}).
+ *
+ * @return The button.
+ */
+ protected JButton createIncreaseButton(int orientation)
+ {
+ increaseButton = new MetalScrollButton(orientation, scrollBarWidth,
+ isFreeStanding);
+ return increaseButton;
+ }
+
+ /**
+ * Paints the track for the scrollbar.
+ *
+ * @param g the graphics device.
+ * @param c the component.
+ * @param trackBounds the track bounds.
+ */
+ protected void paintTrack(Graphics g, JComponent c, Rectangle trackBounds)
+ {
+ g.setColor(MetalLookAndFeel.getControl());
+ g.fillRect(trackBounds.x, trackBounds.y, trackBounds.width,
+ trackBounds.height);
+ if (scrollbar.getOrientation() == HORIZONTAL)
+ paintTrackHorizontal(g, c, trackBounds.x, trackBounds.y,
+ trackBounds.width, trackBounds.height);
+ else
+ paintTrackVertical(g, c, trackBounds.x, trackBounds.y,
+ trackBounds.width, trackBounds.height);
+
+ }
+
+ /**
+ * Paints the track for a horizontal scrollbar.
+ *
+ * @param g the graphics device.
+ * @param c the component.
+ * @param x the x-coordinate for the track bounds.
+ * @param y the y-coordinate for the track bounds.
+ * @param w the width for the track bounds.
+ * @param h the height for the track bounds.
+ */
+ private void paintTrackHorizontal(Graphics g, JComponent c,
+ int x, int y, int w, int h)
+ {
+ if (c.isEnabled())
+ {
+ g.setColor(MetalLookAndFeel.getControlDarkShadow());
+ g.drawLine(x, y, x, y + h - 1);
+ g.drawLine(x, y, x + w - 1, y);
+ g.drawLine(x + w - 1, y, x + w - 1, y + h - 1);
+
+ g.setColor(scrollBarShadowColor);
+ g.drawLine(x + 1, y + 1, x + 1, y + h - 1);
+ g.drawLine(x + 1, y + 1, x + w - 2, y + 1);
+
+ if (isFreeStanding)
+ {
+ g.setColor(MetalLookAndFeel.getControlDarkShadow());
+ g.drawLine(x, y + h - 2, x + w - 1, y + h - 2);
+ g.setColor(scrollBarShadowColor);
+ g.drawLine(x, y + h - 1, x + w - 1, y + h - 1);
+ }
+ }
+ else
+ {
+ g.setColor(MetalLookAndFeel.getControlDisabled());
+ if (isFreeStanding)
+ g.drawRect(x, y, w - 1, h - 1);
+ else
+ {
+ g.drawLine(x, y, x + w - 1, y);
+ g.drawLine(x, y, x, y + h - 1);
+ g.drawLine(x + w - 1, y, x + w - 1, y + h - 1);
+ }
+ }
+ }
+
+ /**
+ * Paints the track for a vertical scrollbar.
+ *
+ * @param g the graphics device.
+ * @param c the component.
+ * @param x the x-coordinate for the track bounds.
+ * @param y the y-coordinate for the track bounds.
+ * @param w the width for the track bounds.
+ * @param h the height for the track bounds.
+ */
+ private void paintTrackVertical(Graphics g, JComponent c,
+ int x, int y, int w, int h)
+ {
+ if (c.isEnabled())
+ {
+ g.setColor(MetalLookAndFeel.getControlDarkShadow());
+ g.drawLine(x, y, x, y + h - 1);
+ g.drawLine(x, y, x + w - 1, y);
+ g.drawLine(x, y + h - 1, x + w - 1, y + h - 1);
+
+ g.setColor(scrollBarShadowColor);
+ g.drawLine(x + 1, y + 1, x + w - 1, y + 1);
+ g.drawLine(x + 1, y + 1, x + 1, y + h - 2);
+
+ if (isFreeStanding)
+ {
+ g.setColor(MetalLookAndFeel.getControlDarkShadow());
+ g.drawLine(x + w - 2, y, x + w - 2, y + h - 1);
+ g.setColor(MetalLookAndFeel.getControlHighlight());
+ g.drawLine(x + w - 1, y, x + w - 1, y + h - 1);
+ }
+ }
+ else
+ {
+ g.setColor(MetalLookAndFeel.getControlDisabled());
+ if (isFreeStanding)
+ g.drawRect(x, y, w - 1, h - 1);
+ else
+ {
+ g.drawLine(x, y, x + w - 1, y);
+ g.drawLine(x, y, x, y + h - 1);
+ g.drawLine(x, y + h - 1, x + w - 1, y + h - 1);
+ }
+ }
+ }
+
+ /**
+ * Paints the slider button of the ScrollBar.
+ *
+ * @param g the Graphics context to use
+ * @param c the JComponent on which we paint
+ * @param thumbBounds the rectangle that is the slider button
+ */
+ protected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds)
+ {
+ // a disabled scrollbar has no thumb in the metal look and feel
+ if (!c.isEnabled())
+ return;
+ if (scrollbar.getOrientation() == HORIZONTAL)
+ paintThumbHorizontal(g, c, thumbBounds);
+ else
+ paintThumbVertical(g, c, thumbBounds);
+
+ // Draw the pattern when the theme is not Ocean.
+ if (! (MetalLookAndFeel.getCurrentTheme() instanceof OceanTheme))
+ {
+ MetalUtils.fillMetalPattern(c, g, thumbBounds.x + 3, thumbBounds.y + 3,
+ thumbBounds.width - 6,
+ thumbBounds.height - 6,
+ thumbHighlightColor,
+ thumbLightShadowColor);
+ }
+ }
+
+ /**
+ * Paints the thumb for a horizontal scroll bar.
+ *
+ * @param g the graphics device.
+ * @param c the scroll bar component.
+ * @param thumbBounds the thumb bounds.
+ */
+ private void paintThumbHorizontal(Graphics g, JComponent c,
+ Rectangle thumbBounds)
+ {
+ int x = thumbBounds.x;
+ int y = thumbBounds.y;
+ int w = thumbBounds.width;
+ int h = thumbBounds.height;
+
+ // First we fill the background.
+ MetalTheme theme = MetalLookAndFeel.getCurrentTheme();
+ if (theme instanceof OceanTheme
+ && UIManager.get("ScrollBar.gradient") != null)
+ {
+ MetalUtils.paintGradient(g, x + 2, y + 2, w - 4, h - 2,
+ SwingConstants.VERTICAL,
+ "ScrollBar.gradient");
+ }
+ else
+ {
+ g.setColor(thumbColor);
+ if (isFreeStanding)
+ g.fillRect(x, y, w, h - 1);
+ else
+ g.fillRect(x, y, w, h);
+ }
+
+ // then draw the dark box
+ g.setColor(thumbLightShadowColor);
+ if (isFreeStanding)
+ g.drawRect(x, y, w - 1, h - 2);
+ else
+ {
+ g.drawLine(x, y, x + w - 1, y);
+ g.drawLine(x, y, x, y + h - 1);
+ g.drawLine(x + w - 1, y, x + w - 1, y + h - 1);
+ }
+
+ // then the highlight
+ g.setColor(thumbHighlightColor);
+ if (isFreeStanding)
+ {
+ g.drawLine(x + 1, y + 1, x + w - 3, y + 1);
+ g.drawLine(x + 1, y + 1, x + 1, y + h - 3);
+ }
+ else
+ {
+ g.drawLine(x + 1, y + 1, x + w - 3, y + 1);
+ g.drawLine(x + 1, y + 1, x + 1, y + h - 1);
+ }
+
+ // draw the shadow line
+ g.setColor(UIManager.getColor("ScrollBar.shadow"));
+ g.drawLine(x + w, y + 1, x + w, y + h - 1);
+
+ // For the OceanTheme, draw the 3 lines in the middle.
+ if (theme instanceof OceanTheme)
+ {
+ g.setColor(thumbLightShadowColor);
+ int middle = x + w / 2;
+ g.drawLine(middle - 2, y + 4, middle - 2, y + h - 5);
+ g.drawLine(middle, y + 4, middle, y + h - 5);
+ g.drawLine(middle + 2, y + 4, middle + 2, y + h - 5);
+ g.setColor(UIManager.getColor("ScrollBar.highlight"));
+ g.drawLine(middle - 1, y + 5, middle - 1, y + h - 4);
+ g.drawLine(middle + 1, y + 5, middle + 1, y + h - 4);
+ g.drawLine(middle + 3, y + 5, middle + 3, y + h - 4);
+ }
+ }
+
+ /**
+ * Paints the thumb for a vertical scroll bar.
+ *
+ * @param g the graphics device.
+ * @param c the scroll bar component.
+ * @param thumbBounds the thumb bounds.
+ */
+ private void paintThumbVertical(Graphics g, JComponent c,
+ Rectangle thumbBounds)
+ {
+ int x = thumbBounds.x;
+ int y = thumbBounds.y;
+ int w = thumbBounds.width;
+ int h = thumbBounds.height;
+
+ // First we fill the background.
+ MetalTheme theme = MetalLookAndFeel.getCurrentTheme();
+ if (theme instanceof OceanTheme
+ && UIManager.get("ScrollBar.gradient") != null)
+ {
+ MetalUtils.paintGradient(g, x + 2, y + 2, w - 2, h - 4,
+ SwingConstants.HORIZONTAL,
+ "ScrollBar.gradient");
+ }
+ else
+ {
+ g.setColor(thumbColor);
+ if (isFreeStanding)
+ g.fillRect(x, y, w - 1, h);
+ else
+ g.fillRect(x, y, w, h);
+ }
+
+ // then draw the dark box
+ g.setColor(thumbLightShadowColor);
+ if (isFreeStanding)
+ g.drawRect(x, y, w - 2, h - 1);
+ else
+ {
+ g.drawLine(x, y, x + w - 1, y);
+ g.drawLine(x, y, x, y + h - 1);
+ g.drawLine(x, y + h - 1, x + w - 1, y + h - 1);
+ }
+
+ // then the highlight
+ g.setColor(thumbHighlightColor);
+ if (isFreeStanding)
+ {
+ g.drawLine(x + 1, y + 1, x + w - 3, y + 1);
+ g.drawLine(x + 1, y + 1, x + 1, y + h - 3);
+ }
+ else
+ {
+ g.drawLine(x + 1, y + 1, x + w - 1, y + 1);
+ g.drawLine(x + 1, y + 1, x + 1, y + h - 3);
+ }
+
+ // draw the shadow line
+ g.setColor(UIManager.getColor("ScrollBar.shadow"));
+ g.drawLine(x + 1, y + h, x + w - 2, y + h);
+
+ // For the OceanTheme, draw the 3 lines in the middle.
+ if (theme instanceof OceanTheme)
+ {
+ g.setColor(thumbLightShadowColor);
+ int middle = y + h / 2;
+ g.drawLine(x + 4, middle - 2, x + w - 5, middle - 2);
+ g.drawLine(x + 4, middle, x + w - 5, middle);
+ g.drawLine(x + 4, middle + 2, x + w - 5, middle + 2);
+ g.setColor(UIManager.getColor("ScrollBar.highlight"));
+ g.drawLine(x + 5, middle - 1, x + w - 4, middle - 1);
+ g.drawLine(x + 5, middle + 1, x + w - 4, middle + 1);
+ g.drawLine(x + 5, middle + 3, x + w - 4, middle + 3);
+ }
+ }
+
+ /**
+ * Returns the minimum thumb size. For a free standing scroll bar the
+ * minimum size is <code>17 x 17</code> pixels, whereas for a non free
+ * standing scroll bar the minimum size is <code>15 x 15</code> pixels.
+ *
+ * @return The minimum thumb size.
+ */
+ protected Dimension getMinimumThumbSize()
+ {
+ Dimension retVal;
+ if (scrollbar != null)
+ {
+ if (isFreeStanding)
+ retVal = MIN_THUMB_SIZE_FREE_STANDING;
+ else
+ retVal = MIN_THUMB_SIZE;
+ }
+ else
+ retVal = new Dimension(0, 0);
+ return retVal;
+ }
+
+ /**
+ * Returns the <code>preferredSize</code> for the specified scroll bar.
+ * For a vertical scrollbar the height is the sum of the preferred heights
+ * of the buttons plus <code>30</code>. The width is fetched from the
+ * <code>UIManager</code> property <code>ScrollBar.width</code>.
+ *
+ * For horizontal scrollbars the width is the sum of the preferred widths
+ * of the buttons plus <code>30</code>. The height is fetched from the
+ * <code>UIManager</code> property <code>ScrollBar.height</code>.
+ *
+ * @param c the scrollbar for which to calculate the preferred size
+ *
+ * @return the <code>preferredSize</code> for the specified scroll bar
+ */
+ public Dimension getPreferredSize(JComponent c)
+ {
+ int height;
+ int width;
+ height = width = 0;
+
+ if (scrollbar.getOrientation() == SwingConstants.HORIZONTAL)
+ {
+ width += incrButton.getPreferredSize().getWidth();
+ width += decrButton.getPreferredSize().getWidth();
+ width += 30;
+ height = UIManager.getInt("ScrollBar.width");
+ }
+ else
+ {
+ height += incrButton.getPreferredSize().getHeight();
+ height += decrButton.getPreferredSize().getHeight();
+ height += 30;
+ width = UIManager.getInt("ScrollBar.width");
+ }
+
+ Insets insets = scrollbar.getInsets();
+
+ height += insets.top + insets.bottom;
+ width += insets.left + insets.right;
+
+ return new Dimension(width, height);
+ }
+}
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