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1: /* BasicToolTipUI.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.Color; 42: import java.awt.Dimension; 43: import java.awt.FontMetrics; 44: import java.awt.Graphics; 45: import java.awt.Insets; 46: import java.awt.Rectangle; 47: import java.awt.Toolkit; 48: 49: import javax.swing.JComponent; 50: import javax.swing.JToolTip; 51: import javax.swing.LookAndFeel; 52: import javax.swing.SwingConstants; 53: import javax.swing.SwingUtilities; 54: import javax.swing.plaf.ComponentUI; 55: import javax.swing.plaf.ToolTipUI; 56: 57: /** 58: * This is the Basic Look and Feel UI class for JToolTip. 59: */ 60: public class BasicToolTipUI extends ToolTipUI 61: { 62: 63: /** The shared instance of BasicToolTipUI used for all ToolTips. */ 64: private static BasicToolTipUI shared; 65: 66: /** The tooltip's text */ 67: private String text; 68: 69: /** 70: * Creates a new BasicToolTipUI object. 71: */ 72: public BasicToolTipUI() 73: { 74: super(); 75: } 76: 77: /** 78: * This method creates a new BasicToolTip UI for the given 79: * JComponent. 80: * 81: * @param c The JComponent to create a UI for. 82: * 83: * @return A BasicToolTipUI that can be used by the given JComponent. 84: */ 85: public static ComponentUI createUI(JComponent c) 86: { 87: if (shared == null) 88: shared = new BasicToolTipUI(); 89: return shared; 90: } 91: 92: /** 93: * This method returns the msximum size of the given JComponent. 94: * 95: * @param c The JComponent to find a maximum size for. 96: * 97: * @return The maximum size. 98: */ 99: public Dimension getMaximumSize(JComponent c) 100: { 101: return getPreferredSize(c); 102: } 103: 104: /** 105: * This method returns the minimum size of the given JComponent. 106: * 107: * @param c The JComponent to find a minimum size for. 108: * 109: * @return The minimum size. 110: */ 111: public Dimension getMinimumSize(JComponent c) 112: { 113: return getPreferredSize(c); 114: } 115: 116: /** 117: * This method returns the preferred size of the given JComponent. 118: * 119: * @param c The JComponent to find a preferred size for. 120: * 121: * @return The preferred size. 122: */ 123: public Dimension getPreferredSize(JComponent c) 124: { 125: JToolTip tip = (JToolTip) c; 126: FontMetrics fm; 127: Toolkit g = tip.getToolkit(); 128: text = tip.getTipText(); 129: 130: Rectangle vr = new Rectangle(); 131: Rectangle ir = new Rectangle(); 132: Rectangle tr = new Rectangle(); 133: Insets insets = tip.getInsets(); 134: fm = g.getFontMetrics(tip.getFont()); 135: SwingUtilities.layoutCompoundLabel(tip, fm, text, null, 136: SwingConstants.CENTER, 137: SwingConstants.CENTER, 138: SwingConstants.CENTER, 139: SwingConstants.CENTER, vr, ir, tr, 0); 140: return new Dimension(insets.left + tr.width + insets.right, 141: insets.top + tr.height + insets.bottom); 142: } 143: 144: /** 145: * This method installs the defaults for the given JComponent. 146: * 147: * @param c The JComponent to install defaults for. 148: */ 149: protected void installDefaults(JComponent c) 150: { 151: LookAndFeel.installColorsAndFont(c, "ToolTip.background", 152: "ToolTip.foreground", "ToolTip.font"); 153: LookAndFeel.installBorder(c, "ToolTip.border"); 154: } 155: 156: /** 157: * This method installs the listeners for the given JComponent. 158: * 159: * @param c The JComponent to install listeners for. 160: */ 161: protected void installListeners(JComponent c) 162: { 163: // TODO: Implement this properly. 164: } 165: 166: /** 167: * This method installs the UI for the given JComponent. 168: * 169: * @param c The JComponent to install the UI for. 170: */ 171: public void installUI(JComponent c) 172: { 173: c.setOpaque(true); 174: installDefaults(c); 175: installListeners(c); 176: } 177: 178: /** 179: * This method paints the given JComponent with the given Graphics object. 180: * 181: * @param g The Graphics object to paint with. 182: * @param c The JComponent to paint. 183: */ 184: public void paint(Graphics g, JComponent c) 185: { 186: JToolTip tip = (JToolTip) c; 187: 188: String text = tip.getTipText(); 189: Toolkit t = tip.getToolkit(); 190: if (text == null) 191: return; 192: 193: Rectangle vr = new Rectangle(); 194: vr = SwingUtilities.calculateInnerArea(tip, vr); 195: Rectangle ir = new Rectangle(); 196: Rectangle tr = new Rectangle(); 197: FontMetrics fm = t.getFontMetrics(tip.getFont()); 198: int ascent = fm.getAscent(); 199: SwingUtilities.layoutCompoundLabel(tip, fm, text, null, 200: SwingConstants.CENTER, 201: SwingConstants.CENTER, 202: SwingConstants.CENTER, 203: SwingConstants.CENTER, vr, ir, tr, 0); 204: Color saved = g.getColor(); 205: g.setColor(Color.BLACK); 206: 207: g.drawString(text, vr.x, vr.y + ascent); 208: 209: g.setColor(saved); 210: } 211: 212: /** 213: * This method uninstalls the defaults for the given JComponent. 214: * 215: * @param c The JComponent to uninstall defaults for. 216: */ 217: protected void uninstallDefaults(JComponent c) 218: { 219: c.setForeground(null); 220: c.setBackground(null); 221: c.setFont(null); 222: c.setBorder(null); 223: } 224: 225: /** 226: * This method uninstalls listeners for the given JComponent. 227: * 228: * @param c The JComponent to uninstall listeners for. 229: */ 230: protected void uninstallListeners(JComponent c) 231: { 232: // TODO: Implement this properly. 233: } 234: 235: /** 236: * This method uninstalls the UI for the given JComponent. 237: * 238: * @param c The JComponent to uninstall. 239: */ 240: public void uninstallUI(JComponent c) 241: { 242: uninstallDefaults(c); 243: uninstallListeners(c); 244: } 245: }