Java tutorial
/* * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package javax.swing.plaf.metal; import java.awt.*; import java.awt.event.*; import javax.swing.plaf.basic.*; import javax.swing.*; import javax.swing.plaf.*; import javax.swing.border.*; import java.io.Serializable; /** * JButton subclass to help out MetalComboBoxUI * <p> * <strong>Warning:</strong> * Serialized objects of this class will not be compatible with * future Swing releases. The current serialization support is * appropriate for short term storage or RMI between applications running * the same version of Swing. As of 1.4, support for long term storage * of all JavaBeans™ * has been added to the <code>java.beans</code> package. * Please see {@link java.beans.XMLEncoder}. * * @see MetalComboBoxButton * @author Tom Santos */ @SuppressWarnings("serial") // Same-version serialization only public class MetalComboBoxButton extends JButton { /** * The instance of {@code JComboBox}. */ protected JComboBox<Object> comboBox; /** * The instance of {@code JList}. */ protected JList<Object> listBox; /** * The instance of {@code CellRendererPane}. */ protected CellRendererPane rendererPane; /** * The icon. */ protected Icon comboIcon; /** * The {@code iconOnly} value. */ protected boolean iconOnly = false; /** * Returns the {@code JComboBox}. * * @return the {@code JComboBox} */ public final JComboBox<Object> getComboBox() { return comboBox; } /** * Sets the {@code JComboBox}. * * @param cb the {@code JComboBox} */ public final void setComboBox(JComboBox<Object> cb) { comboBox = cb; } /** * Returns the icon of the {@code JComboBox}. * * @return the icon of the {@code JComboBox} */ public final Icon getComboIcon() { return comboIcon; } /** * Sets the icon of the {@code JComboBox}. * * @param i the icon of the {@code JComboBox} */ public final void setComboIcon(Icon i) { comboIcon = i; } /** * Returns the {@code isIconOnly} value. * * @return the {@code isIconOnly} value */ public final boolean isIconOnly() { return iconOnly; } /** * If {@code isIconOnly} is {@code true} then only icon is painted. * * @param isIconOnly if {@code true} then only icon is painted */ public final void setIconOnly(boolean isIconOnly) { iconOnly = isIconOnly; } MetalComboBoxButton() { super(""); DefaultButtonModel model = new DefaultButtonModel() { public void setArmed(boolean armed) { super.setArmed(isPressed() ? true : armed); } }; setModel(model); } /** * Constructs a new instance of {@code MetalComboBoxButton}. * * @param cb an instance of {@code JComboBox} * @param i an icon * @param pane an instance of {@code CellRendererPane} * @param list an instance of {@code JList} */ public MetalComboBoxButton(JComboBox<Object> cb, Icon i, CellRendererPane pane, JList<Object> list) { this(); comboBox = cb; comboIcon = i; rendererPane = pane; listBox = list; setEnabled(comboBox.isEnabled()); } /** * Constructs a new instance of {@code MetalComboBoxButton}. * * @param cb an instance of {@code JComboBox} * @param i an icon * @param onlyIcon if {@code true} only icon is painted * @param pane an instance of {@code CellRendererPane} * @param list an instance of {@code JList} */ public MetalComboBoxButton(JComboBox<Object> cb, Icon i, boolean onlyIcon, CellRendererPane pane, JList<Object> list) { this(cb, i, pane, list); iconOnly = onlyIcon; } @SuppressWarnings("deprecation") public boolean isFocusTraversable() { return false; } public void setEnabled(boolean enabled) { super.setEnabled(enabled); // Set the background and foreground to the combobox colors. if (enabled) { setBackground(comboBox.getBackground()); setForeground(comboBox.getForeground()); } else { setBackground(UIManager.getColor("ComboBox.disabledBackground")); setForeground(UIManager.getColor("ComboBox.disabledForeground")); } } public void paintComponent(Graphics g) { boolean leftToRight = MetalUtils.isLeftToRight(comboBox); // Paint the button as usual super.paintComponent(g); Insets insets = getInsets(); int width = getWidth() - (insets.left + insets.right); int height = getHeight() - (insets.top + insets.bottom); if (height <= 0 || width <= 0) { return; } int left = insets.left; int top = insets.top; int right = left + (width - 1); int bottom = top + (height - 1); int iconWidth = 0; int iconLeft = (leftToRight) ? right : left; // Paint the icon if (comboIcon != null) { iconWidth = comboIcon.getIconWidth(); int iconHeight = comboIcon.getIconHeight(); int iconTop = 0; if (iconOnly) { iconLeft = (getWidth() / 2) - (iconWidth / 2); iconTop = (getHeight() / 2) - (iconHeight / 2); } else { if (leftToRight) { iconLeft = (left + (width - 1)) - iconWidth; } else { iconLeft = left; } iconTop = (top + ((bottom - top) / 2)) - (iconHeight / 2); } comboIcon.paintIcon(this, g, iconLeft, iconTop); // Paint the focus if (comboBox.hasFocus() && (!MetalLookAndFeel.usingOcean() || comboBox.isEditable())) { g.setColor(MetalLookAndFeel.getFocusColor()); g.drawRect(left - 1, top - 1, width + 3, height + 1); } } if (MetalLookAndFeel.usingOcean()) { // With Ocean the button only paints the arrow, bail. return; } // Let the renderer paint if (!iconOnly && comboBox != null) { ListCellRenderer<Object> renderer = comboBox.getRenderer(); Component c; boolean renderPressed = getModel().isPressed(); c = renderer.getListCellRendererComponent(listBox, comboBox.getSelectedItem(), -1, renderPressed, false); c.setFont(rendererPane.getFont()); if (model.isArmed() && model.isPressed()) { if (isOpaque()) { c.setBackground(UIManager.getColor("Button.select")); } c.setForeground(comboBox.getForeground()); } else if (!comboBox.isEnabled()) { if (isOpaque()) { c.setBackground(UIManager.getColor("ComboBox.disabledBackground")); } c.setForeground(UIManager.getColor("ComboBox.disabledForeground")); } else { c.setForeground(comboBox.getForeground()); c.setBackground(comboBox.getBackground()); } int cWidth = width - (insets.right + iconWidth); // Fix for 4238829: should lay out the JPanel. boolean shouldValidate = false; if (c instanceof JPanel) { shouldValidate = true; } if (leftToRight) { rendererPane.paintComponent(g, c, this, left, top, cWidth, height, shouldValidate); } else { rendererPane.paintComponent(g, c, this, left + iconWidth, top, cWidth, height, shouldValidate); } } } public Dimension getMinimumSize() { Dimension ret = new Dimension(); Insets insets = getInsets(); ret.width = insets.left + getComboIcon().getIconWidth() + insets.right; ret.height = insets.bottom + getComboIcon().getIconHeight() + insets.top; return ret; } }