2 * Jalview - A Sequence Alignment Editor and Viewer
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3 * Copyright (C) 2007 AM Waterhouse, J Procter, G Barton, M Clamp, S Searle
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5 * This program is free software; you can redistribute it and/or
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6 * modify it under the terms of the GNU General Public License
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7 * as published by the Free Software Foundation; either version 2
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8 * of the License, or (at your option) any later version.
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10 * This program is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 * GNU General Public License for more details.
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15 * You should have received a copy of the GNU General Public License
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16 * along with this program; if not, write to the Free Software
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17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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20 package jalview.appletgui;
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22 import java.applet.*;
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26 import java.awt.event.*;
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28 public class Tooltip
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29 extends Canvas implements MouseListener,
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32 private String[] tip;
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33 private String lastTip = "";
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34 private boolean setPosition = false;
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35 protected Component owner;
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37 private Container mainContainer;
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38 private LayoutManager mainLayout;
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40 private boolean shown;
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42 private final int VERTICAL_OFFSET = 20;
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43 private final int HORIZONTAL_ENLARGE = 10;
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51 public Tooltip(String tip, Component owner)
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54 owner.addMouseListener(this);
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55 owner.addMouseMotionListener(this);
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56 setBackground(new Color(255, 255, 220));
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58 java.net.URL url = getClass().getResource("/images/link.gif");
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61 linkImage = java.awt.Toolkit.getDefaultToolkit().getImage(url);
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65 public void paint(Graphics g)
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67 int w = getSize().width;
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68 int h = getSize().height;
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70 g.drawRect(0, 0, w - 1, h - 1);
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72 for (int i = 0; i < tip.length; i++)
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75 lindex = tip[i].indexOf("%LINK%");
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80 g.drawString(tip[i].substring(0, lindex), 3, (i + 1) * fontHeight - 3);
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81 x += fm.stringWidth(tip[i].substring(0, lindex) + 3);
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83 g.drawImage(linkImage, x, i * fontHeight + 1, this);
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84 if (lindex + 6 < tip[i].length())
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86 g.drawString(tip[i].substring(lindex + 6),
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87 x + linkImage.getWidth(this),
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88 (i + 1) * fontHeight - 3);
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93 g.drawString(tip[i], 3, (i + 1) * fontHeight - 3);
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98 synchronized void setTip(String tip)
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106 if (lastTip.equals(tip))
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112 setPosition = true;
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114 fm = getFontMetrics(owner.getFont());
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115 fontHeight = fm.getHeight();
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117 int longestLine = 0;
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118 StringTokenizer st = new StringTokenizer(tip, "\n");
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119 this.tip = new String[st.countTokens()];
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121 while (st.hasMoreElements())
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123 this.tip[index] = st.nextToken();
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124 if (fm.stringWidth(this.tip[index]) > longestLine)
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126 longestLine = fm.stringWidth(this.tip[index]);
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131 setSize(longestLine + HORIZONTAL_ENLARGE,
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132 fontHeight * this.tip.length);
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138 void setTipLocation(MouseEvent evt)
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140 setLocation( (owner.getLocationOnScreen().x
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141 - mainContainer.getLocationOnScreen().x) + evt.getX(),
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142 (owner.getLocationOnScreen().y -
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143 mainContainer.getLocationOnScreen().y
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144 + VERTICAL_OFFSET) + evt.getY());
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146 // correction, whole tool tip must be visible
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147 if (mainContainer.getSize().width < (getLocation().x + getSize().width))
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149 setLocation(mainContainer.getSize().width - getSize().width,
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154 private void removeToolTip()
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158 mainContainer.remove(0);
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159 mainContainer.setLayout(mainLayout);
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160 mainContainer.validate();
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165 private void findMainContainer()
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167 Container parent = owner.getParent();
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170 if ( (parent instanceof Applet) || (parent instanceof Frame))
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172 mainContainer = parent;
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177 parent = parent.getParent();
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180 mainLayout = mainContainer.getLayout();
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183 public void mouseEntered(MouseEvent me)
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185 setTipLocation(me);
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188 public void mouseExited(MouseEvent me)
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193 public void mousePressed(MouseEvent me)
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198 public void mouseReleased(MouseEvent me)
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201 public void mouseClicked(MouseEvent me)
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204 public void mouseMoved(MouseEvent me)
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208 findMainContainer();
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209 mainContainer.setLayout(null);
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210 mainContainer.add(this, 0);
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211 mainContainer.validate();
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213 setTipLocation(me);
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215 else if (setPosition)
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217 setTipLocation(me);
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218 setPosition = false;
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222 public void mouseDragged(MouseEvent me)
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