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1: /* BasicComboBoxRenderer.java -- 2: Copyright (C) 2004, 2005 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package javax.swing.plaf.basic; 40: 41: import java.awt.Component; 42: import java.awt.Dimension; 43: import java.awt.FontMetrics; 44: import java.io.Serializable; 45: 46: import javax.swing.JComboBox; 47: import javax.swing.JLabel; 48: import javax.swing.JList; 49: import javax.swing.ListCellRenderer; 50: import javax.swing.SwingConstants; 51: import javax.swing.SwingUtilities; 52: import javax.swing.border.Border; 53: import javax.swing.border.EmptyBorder; 54: 55: /** 56: * A renderer for a {@link JComboBox}. 57: * 58: * @author Olga Rodimina 59: */ 60: public class BasicComboBoxRenderer 61: extends JLabel 62: implements ListCellRenderer, Serializable 63: { 64: /** 65: * A shared border instance for all renderers. 66: */ 67: protected static Border noFocusBorder = new EmptyBorder(0, 0, 0, 0); 68: 69: /** 70: * Creates a new <code>BasicComboBoxRenderer</code> object. 71: */ 72: public BasicComboBoxRenderer() 73: { 74: setHorizontalAlignment(SwingConstants.LEFT); 75: setBorder(noFocusBorder); 76: } 77: 78: /** 79: * Returns preferredSize of the renderer 80: * 81: * @return preferredSize of the renderer 82: */ 83: public Dimension getPreferredSize() 84: { 85: return super.getPreferredSize(); 86: } 87: 88: /** 89: * Returns a component that has been configured to display the given 90: * <code>value</code>. 91: * 92: * @param list List of items for which to the background and foreground 93: * colors 94: * @param value object that should be rendered in the cell 95: * @param index index of the cell in the list of items. 96: * @param isSelected draw cell highlighted if isSelected is true 97: * @param cellHasFocus draw focus rectangle around cell if the cell has 98: * focus 99: * 100: * @return Component that will be used to draw the desired cell. 101: */ 102: public Component getListCellRendererComponent(JList list, Object value, 103: int index, boolean isSelected, 104: boolean cellHasFocus) 105: { 106: String s = value.toString(); 107: 108: // String maybe larger than comboBox. 109: FontMetrics fm = getToolkit().getFontMetrics(list.getFont()); 110: int strWidth = SwingUtilities.computeStringWidth(fm, s); 111: int cbWidth = getSize().width; 112: if (cbWidth != 0 && strWidth > cbWidth) 113: { 114: char[] str = s.toCharArray(); 115: int currWidth = 0; 116: int i = 0; 117: String postStr = "... "; 118: cbWidth -= SwingUtilities.computeStringWidth(fm, postStr); 119: while (i < str.length && currWidth < cbWidth) 120: { 121: ++i; 122: currWidth = SwingUtilities.computeStringWidth(fm, new String(str, 0, i)); 123: } 124: setText(new String(str, 0, i) + postStr); 125: } 126: else 127: setText(s); 128: 129: setOpaque(true); 130: 131: if (isSelected || cellHasFocus) 132: { 133: setBackground(list.getSelectionBackground()); 134: setForeground(list.getSelectionForeground()); 135: } 136: else 137: { 138: setBackground(list.getBackground()); 139: setForeground(list.getForeground()); 140: } 141: 142: setEnabled(list.isEnabled()); 143: setFont(list.getFont()); 144: return this; 145: } 146: 147: /** 148: * A subclass of {@link BasicComboBoxRenderer} that implements the 149: * {@link javax.swing.plaf.UIResource} interface. 150: */ 151: public static class UIResource extends BasicComboBoxRenderer 152: implements javax.swing.plaf.UIResource 153: { 154: /** 155: * Creates a new <code>UIResource</code> object. 156: */ 157: public UIResource() 158: { 159: // Nothing to do here. 160: } 161: } 162: }
GNU Classpath (0.20) |