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+/* MetalButtonUI.java
+ Copyright (C) 2005 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.Component;
+import java.awt.Font;
+import java.awt.FontMetrics;
+import java.awt.Graphics;
+import java.awt.Rectangle;
+
+import javax.swing.AbstractButton;
+import javax.swing.ButtonModel;
+import javax.swing.JButton;
+import javax.swing.JComponent;
+import javax.swing.JToolBar;
+import javax.swing.SwingConstants;
+import javax.swing.UIManager;
+import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
+import javax.swing.plaf.basic.BasicButtonUI;
+
+/**
+ * A UI delegate for the {@link JButton} component.
+ *
+ * @author Roman Kennke (roman@kennke.org)
+ */
+public class MetalButtonUI
+ extends BasicButtonUI
+{
+
+ /**
+ * The shared button UI.
+ */
+ private static MetalButtonUI sharedUI;
+
+ /**
+ * The color used to draw the focus rectangle around the text and/or icon.
+ */
+ protected Color focusColor;
+
+ /**
+ * The background color for the button when it is pressed.
+ */
+ protected Color selectColor;
+
+ /**
+ * The color for disabled button labels.
+ */
+ protected Color disabledTextColor;
+
+ /**
+ * Returns a UI delegate for the specified component.
+ *
+ * @param c the component (should be a subclass of {@link AbstractButton}).
+ *
+ * @return A new instance of <code>MetalButtonUI</code>.
+ */
+ public static ComponentUI createUI(JComponent c)
+ {
+ if (sharedUI == null)
+ sharedUI = new MetalButtonUI();
+ return sharedUI;
+ }
+
+ /**
+ * Creates a new instance.
+ */
+ public MetalButtonUI()
+ {
+ super();
+ }
+
+ /**
+ * Returns the color for the focus border.
+ *
+ * @return the color for the focus border
+ */
+ protected Color getFocusColor()
+ {
+ focusColor = UIManager.getColor(getPropertyPrefix() + "focus");
+ return focusColor;
+ }
+
+ /**
+ * Returns the color that indicates a selected button.
+ *
+ * @return the color that indicates a selected button
+ */
+ protected Color getSelectColor()
+ {
+ selectColor = UIManager.getColor(getPropertyPrefix() + "select");
+ return selectColor;
+ }
+
+ /**
+ * Returns the color for the text label of disabled buttons.
+ *
+ * @return the color for the text label of disabled buttons
+ */
+ protected Color getDisabledTextColor()
+ {
+ disabledTextColor = UIManager.getColor(getPropertyPrefix()
+ + "disabledText");
+ return disabledTextColor;
+ }
+
+ /**
+ * Installs the default settings for the specified button.
+ *
+ * @param button the button.
+ *
+ * @see #uninstallDefaults(AbstractButton)
+ */
+ public void installDefaults(AbstractButton button)
+ {
+ // This is overridden to be public, for whatever reason.
+ super.installDefaults(button);
+ }
+
+ /**
+ * Removes the defaults added by {@link #installDefaults(AbstractButton)}.
+ */
+ public void uninstallDefaults(AbstractButton button)
+ {
+ // This is overridden to be public, for whatever reason.
+ super.uninstallDefaults(button);
+ }
+
+ /**
+ * Paints the background of the button to indicate that it is in the
+ * "pressed" state.
+ *
+ * @param g the graphics context.
+ * @param b the button.
+ */
+ protected void paintButtonPressed(Graphics g, AbstractButton b)
+ {
+ if (b.isContentAreaFilled())
+ {
+ g.setColor(getSelectColor());
+ g.fillRect(0, 0, b.getWidth(), b.getHeight());
+ }
+ }
+
+ /**
+ * Paints the focus rectangle around the button text and/or icon.
+ *
+ * @param g the graphics context.
+ * @param b the button.
+ * @param viewRect the button bounds.
+ * @param textRect the text bounds.
+ * @param iconRect the icon bounds.
+ */
+ protected void paintFocus(Graphics g, AbstractButton b, Rectangle viewRect,
+ Rectangle textRect, Rectangle iconRect)
+ {
+ if (b.isEnabled() && b.hasFocus() && b.isFocusPainted())
+ {
+ Color savedColor = g.getColor();
+ g.setColor(getFocusColor());
+ Rectangle focusRect = iconRect.union(textRect);
+ g.drawRect(focusRect.x - 1, focusRect.y,
+ focusRect.width + 1, focusRect.height);
+ g.setColor(savedColor);
+ }
+ }
+
+ /**
+ * Paints the button text.
+ *
+ * @param g the graphics context.
+ * @param c the button.
+ * @param textRect the text bounds.
+ * @param text the text to display.
+ */
+ protected void paintText(Graphics g, JComponent c, Rectangle textRect,
+ String text)
+ {
+ AbstractButton b = (AbstractButton) c;
+ Font f = b.getFont();
+ g.setFont(f);
+ FontMetrics fm = g.getFontMetrics(f);
+
+ if (b.isEnabled())
+ {
+ g.setColor(b.getForeground());
+ g.drawString(text, textRect.x, textRect.y + fm.getAscent());
+ }
+ else
+ {
+ g.setColor(getDisabledTextColor());
+ g.drawString(text, textRect.x, textRect.y + fm.getAscent());
+ }
+ }
+
+ /**
+ * If the property <code>Button.gradient</code> is set, then a gradient is
+ * painted as background, otherwise the normal superclass behaviour is
+ * called.
+ */
+ public void update(Graphics g, JComponent c)
+ {
+ AbstractButton b = (AbstractButton) c;
+ if ((b.getBackground() instanceof UIResource)
+ && b.isContentAreaFilled() && b.isEnabled())
+ {
+ ButtonModel m = b.getModel();
+ String uiKey = "Button.gradient";
+ if (! isToolbarButton(b))
+ {
+ if (! m.isArmed() && ! m.isPressed() && isDrawingGradient(uiKey))
+ {
+ MetalUtils.paintGradient(g, 0, 0, b.getWidth(), b.getHeight(),
+ SwingConstants.VERTICAL,
+ uiKey);
+ paint(g, c);
+ return;
+ }
+ }
+ else if (m.isRollover() && isDrawingGradient(uiKey))
+ {
+ MetalUtils.paintGradient(g, 0, 0, b.getWidth(), b.getHeight(),
+ SwingConstants.VERTICAL,
+ uiKey);
+ paint(g, c);
+ return;
+ }
+ }
+ // Fallback if we didn't have any of the two above cases.
+ super.update(g, c);
+ }
+
+ /**
+ * Returns <code>true</code> when the button is a toolbar button,
+ * <code>false</code> otherwise.
+ *
+ * @param b the button component to test
+ *
+ * @return <code>true</code> when the button is a toolbar button,
+ * <code>false</code> otherwise
+ */
+ private boolean isToolbarButton(Component b)
+ {
+ Component parent = b.getParent();
+ return parent instanceof JToolBar;
+ }
+
+ /**
+ * Returns <code>true</code> if we should draw the button gradient,
+ * <code>false</code> otherwise.
+ *
+ * @param uiKey the UIManager key for the gradient
+ *
+ * @return <code>true</code> if we should draw the button gradient,
+ * <code>false</code> otherwise
+ */
+ private boolean isDrawingGradient(String uiKey)
+ {
+ return (UIManager.get(uiKey) != null);
+ }
+}