libjava/javax/swing/ScrollPaneLayout.java

   1 /* ScrollPaneLayout.java --
   2    Copyright (C) 2002, 2004  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., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 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;
  40
  41 import java.awt.Component;
  42 import java.awt.Container;
  43 import java.awt.Dimension;
  44 import java.awt.Insets;
  45 import java.awt.LayoutManager;
  46 import java.awt.Point;
  47 import java.awt.Rectangle;
  48 import java.io.Serializable;
  49
  50 import javax.swing.border.Border;
  51
  52 /**
  53  * ScrollPaneLayout
  54  * @author      Andrew Selkirk
  55  * @version     1.0
  56  */
  57 public class ScrollPaneLayout
  58   implements LayoutManager, ScrollPaneConstants, Serializable
  59 {
  60   static final long serialVersionUID = -4480022884523193743L;
  61
  62   public static class UIResource extends ScrollPaneLayout
  63     implements javax.swing.plaf.UIResource {
  64     public UIResource() {
  65     }
  66   }
  67
  68   protected JViewport viewport;
  69   protected JScrollBar vsb;
  70   protected JScrollBar hsb;
  71   protected JViewport rowHead;
  72   protected JViewport colHead;
  73   protected Component lowerLeft;
  74   protected Component lowerRight;
  75   protected Component upperLeft;
  76   protected Component upperRight;
  77   protected int vsbPolicy;
  78   protected int hsbPolicy;
  79
  80   public ScrollPaneLayout() {
  81
  82   }
  83
  84   public void syncWithScrollPane(JScrollPane scrollPane) {
  85     viewport = scrollPane.getViewport();
  86     rowHead = scrollPane.getRowHeader();
  87     colHead = scrollPane.getColumnHeader();
  88     vsb = scrollPane.getVerticalScrollBar();
  89     hsb = scrollPane.getHorizontalScrollBar();
  90     vsbPolicy = scrollPane.getVerticalScrollBarPolicy();
  91     hsbPolicy = scrollPane.getHorizontalScrollBarPolicy();
  92     lowerLeft = scrollPane.getCorner(LOWER_LEFT_CORNER);
  93     lowerRight = scrollPane.getCorner(LOWER_RIGHT_CORNER);
  94     upperLeft = scrollPane.getCorner(UPPER_LEFT_CORNER);
  95     upperRight = scrollPane.getCorner(UPPER_RIGHT_CORNER);
  96   }
  97
  98   protected Component addSingletonComponent(Component oldComponent,
  99                                             Component newComponent) {
 100     return null;
 101   }
 102
 103   public void addLayoutComponent(String key, Component component)
 104   {
 105     if (key == VIEWPORT)
 106       viewport = (JViewport) component;
 107     else if (key == VERTICAL_SCROLLBAR)
 108       vsb = (JScrollBar) component;
 109     else if (key == HORIZONTAL_SCROLLBAR)
 110       hsb = (JScrollBar) component;
 111     else if (key == ROW_HEADER)
 112       rowHead = (JViewport) component;
 113     else if (key == COLUMN_HEADER)
 114       colHead = (JViewport) component;
 115     else if (key == LOWER_RIGHT_CORNER)
 116       lowerRight = component;
 117     else if (key == UPPER_RIGHT_CORNER)
 118       upperRight = component;
 119     else if (key == LOWER_LEFT_CORNER)
 120       lowerLeft = component;
 121     else if (key == UPPER_LEFT_CORNER)
 122       upperLeft = component;
 123   }
 124
 125   public void removeLayoutComponent(Component component) {
 126     if (component == viewport)
 127       viewport = null;
 128     else if (component == vsb)
 129       vsb = null;
 130     else if (component == hsb)
 131       hsb = null;
 132     else if (component == rowHead)
 133       rowHead = null;
 134     else if (component == colHead)
 135       colHead = null;
 136     else if (component == lowerRight)
 137       lowerRight = null;
 138     else if (component == upperRight)
 139       upperRight = null;
 140     else if (component == lowerLeft)
 141       lowerLeft = null;
 142     else if (component == upperLeft)
 143       upperLeft = null;
 144   }
 145
 146   public int getVerticalScrollBarPolicy()
 147   {
 148     return vsbPolicy;
 149   }
 150
 151   public void setVerticalScrollBarPolicy(int policy)
 152   {
 153     vsbPolicy = policy;
 154   }
 155
 156   public int getHorizontalScrollBarPolicy()
 157   {
 158     return hsbPolicy;
 159   }
 160
 161   public void setHorizontalScrollBarPolicy(int policy)
 162   {
 163     hsbPolicy = policy;
 164   }
 165
 166   public JViewport getViewport()
 167   {
 168     return viewport;
 169   }
 170
 171   public JScrollBar getHorizontalScrollBar()
 172   {
 173     return hsb;
 174   }
 175
 176   public JScrollBar getVerticalScrollBar()
 177   {
 178     return vsb;
 179   }
 180
 181   public JViewport getRowHeader()
 182   {
 183     return rowHead;
 184   }
 185
 186   public JViewport getColumnHeader()
 187   {
 188     return colHead;
 189   }
 190
 191   public Component getCorner(String key)
 192   {
 193     if (key == LOWER_RIGHT_CORNER)
 194       return lowerRight;
 195     else if (key == UPPER_RIGHT_CORNER)
 196       return upperRight;
 197     else if (key == LOWER_LEFT_CORNER)
 198       return lowerLeft;
 199     else if (key == UPPER_LEFT_CORNER)
 200       return upperLeft;
 201     return null;
 202   }
 203
 204   private static void maybeSetPreferredSize(JComponent src, Dimension dim)
 205   {
 206     Dimension tmp = null;
 207     if (src != null)
 208       tmp = src.getPreferredSize();
 209     if (tmp != null)
 210       dim.setSize(tmp);
 211   }
 212
 213   private static void maybeSetMinimumSize(JComponent src, Dimension dim)
 214   {
 215     Dimension tmp = null;
 216     if (src != null)
 217       tmp = src.getMinimumSize();
 218     if (tmp != null)
 219       dim.setSize(tmp);
 220   }
 221
 222   public Dimension preferredLayoutSize(Container parent)
 223   {
 224     if (parent != null && parent instanceof JScrollPane)
 225       {
 226         JScrollPane sc = (JScrollPane) parent;
 227         synchronized (sc.getTreeLock ())
 228           {
 229             Dimension insetsSize = new Dimension(0,0);
 230             Dimension viewportSize = new Dimension(0,0);
 231             Dimension viewportInsetsSize = new Dimension(0,0);
 232             Dimension columnHeaderSize = new Dimension(0,0);
 233             Dimension rowHeaderSize = new Dimension(0,0);
 234             Dimension verticalScrollBarSize = new Dimension(0,0);
 235             Dimension horizontalScrollBarSize = new Dimension(0,0);
 236
 237             Insets insets = sc.getInsets();
 238             Border viewportBorder = sc.getViewportBorder();
 239             Insets viewportInsets = null;
 240
 241             if (viewportBorder != null)
 242               {
 243               viewportInsets = viewportBorder.getBorderInsets(parent);
 244                 if (viewportInsets != null)
 245                   viewportInsetsSize.setSize(viewportInsets.left + viewportInsets.right,
 246                                              viewportInsets.top + viewportInsets.bottom);
 247               }
 248
 249             if (insets != null)
 250               insetsSize.setSize(insets.left + insets.right,
 251                                  insets.top + insets.bottom);
 252
 253             if (viewport != null)
 254               {
 255                 Component view = null;
 256                 Scrollable scr = null;
 257                 Dimension pref = null;
 258
 259                 view = viewport.getView();
 260                 if (view != null && view instanceof Scrollable)
 261                   scr = (Scrollable) view;
 262                 if (scr != null)
 263                   pref = scr.getPreferredScrollableViewportSize();
 264                 if (pref == null)
 265                   pref = viewport.getPreferredSize();
 266                 if (pref != null)
 267                   viewportSize.setSize(pref);
 268               }
 269
 270             maybeSetPreferredSize(colHead, columnHeaderSize);
 271             maybeSetPreferredSize(rowHead, rowHeaderSize);
 272             maybeSetPreferredSize(vsb, verticalScrollBarSize);
 273             maybeSetPreferredSize(hsb, horizontalScrollBarSize);
 274
 275             return new Dimension(insetsSize.width
 276                                  + viewportSize.width
 277                                  + viewportInsetsSize.width
 278                                  + rowHeaderSize.width
 279                                  + verticalScrollBarSize.width,
 280                                  insetsSize.height
 281                                  + viewportSize.height
 282                                  + viewportInsetsSize.height
 283                                  + columnHeaderSize.height
 284                                  + horizontalScrollBarSize.height);
 285           }
 286       }
 287     else
 288       {
 289         return new Dimension(0,0);
 290       }
 291   }
 292
 293   public Dimension minimumLayoutSize(Container parent)
 294   {
 295     if (parent instanceof JScrollPane)
 296       {
 297         JScrollPane sc = (JScrollPane) parent;
 298         synchronized (sc.getTreeLock ())
 299           {
 300             Dimension insetsSize = new Dimension(0,0);
 301             Dimension viewportSize = new Dimension(0,0);
 302             Dimension viewportInsetsSize = new Dimension(0,0);
 303             Dimension columnHeaderSize = new Dimension(0,0);
 304             Dimension rowHeaderSize = new Dimension(0,0);
 305             Dimension verticalScrollBarSize = new Dimension(0,0);
 306             Dimension horizontalScrollBarSize = new Dimension(0,0);
 307
 308             Insets insets = sc.getInsets();
 309             Border viewportBorder = sc.getViewportBorder();
 310             Insets viewportInsets = null;
 311
 312             if (viewportBorder != null)
 313               {
 314               viewportInsets = viewportBorder.getBorderInsets(parent);
 315                 if (viewportInsets != null)
 316                   viewportInsetsSize.setSize(viewportInsets.left + viewportInsets.right,
 317                                              viewportInsets.top + viewportInsets.bottom);
 318               }
 319
 320             if (insets != null)
 321               insetsSize.setSize(insets.left + insets.right,
 322                                  insets.top + insets.bottom);
 323
 324             maybeSetMinimumSize(colHead, columnHeaderSize);
 325             maybeSetMinimumSize(rowHead, rowHeaderSize);
 326
 327             if (vsbPolicy != VERTICAL_SCROLLBAR_NEVER)
 328               maybeSetMinimumSize(vsb, verticalScrollBarSize);
 329
 330             if (hsbPolicy != HORIZONTAL_SCROLLBAR_NEVER)
 331               maybeSetMinimumSize(hsb, horizontalScrollBarSize);
 332
 333             return new Dimension(insetsSize.width
 334                                  + viewportSize.width
 335                                  + viewportInsetsSize.width
 336                                  + rowHeaderSize.width
 337                                  + verticalScrollBarSize.width,
 338                                  insetsSize.height
 339                                  + viewportSize.height
 340                                  + viewportInsetsSize.height
 341                                  + columnHeaderSize.height
 342                                  + horizontalScrollBarSize.height);
 343           }
 344       }
 345     else
 346       {
 347         return new Dimension(0,0);
 348       }
 349   }
 350
 351   /**
 352    *
 353    *     +----+--------------------+----+ y1
 354    *     | c1 |   column header    | c2 |
 355    *     +----+--------------------+----+ y2
 356    *     | r  |                    | v  |
 357    *     | o  |                    |    |
 358    *     | w  |                    | s  |
 359    *     |    |                    | r  |
 360    *     | h  |                    | o  |
 361    *     | e  |      viewport      | l  |
 362    *     | a  |                    | l  |
 363    *     | d  |                    | b  |
 364    *     | e  |                    | a  |
 365    *     | r  |                    | r  |
 366    *     +----+--------------------+----+ y3
 367    *     | c3 |    h scrollbar     | c4 |
 368    *     +----+--------------------+----+ y4
 369    *    x1   x2                   x3   x4
 370    *
 371    */
 372   public void layoutContainer(Container parent)
 373   {
 374     if (parent instanceof JScrollPane)
 375       {
 376         JScrollPane sc = (JScrollPane) parent;
 377         synchronized (sc.getTreeLock ())
 378           {
 379             JViewport viewport = sc.getViewport();
 380             Dimension viewSize = viewport.getViewSize();
 381             Point viewPos = viewport.getViewPosition();
 382
 383             int x1 = 0, x2 = 0, x3 = 0, x4 = 0;
 384             int y1 = 0, y2 = 0, y3 = 0, y4 = 0;
 385
 386             Rectangle scrollPaneBounds = SwingUtilities.calculateInnerArea(sc, null);
 387
 388             x1 = scrollPaneBounds.x;
 389             y1 = scrollPaneBounds.y;
 390             x4 = scrollPaneBounds.x + scrollPaneBounds.width;
 391             y4 = scrollPaneBounds.y + scrollPaneBounds.height;
 392
 393             if (colHead != null)
 394               y2 = y1 + colHead.getPreferredSize().height;
 395             else
 396               y2 = y1;
 397
 398             if (rowHead != null)
 399               x2 = x1 + rowHead.getPreferredSize().width;
 400             else
 401               x2 = x1;
 402
 403             int vsbPolicy = sc.getVerticalScrollBarPolicy();
 404             int hsbPolicy = sc.getHorizontalScrollBarPolicy();
 405
 406             x3 = x4 - vsb.getPreferredSize().width;
 407             y3 = y4 - hsb.getPreferredSize().height;
 408
 409             boolean showVsb =
 410               (vsb != null)
 411               && ((vsbPolicy == VERTICAL_SCROLLBAR_ALWAYS)
 412                   || (vsbPolicy == VERTICAL_SCROLLBAR_AS_NEEDED
 413                       && viewSize.height > (y3 - y2)));
 414
 415             boolean showHsb =
 416               (hsb != null)
 417               && ((hsbPolicy == HORIZONTAL_SCROLLBAR_ALWAYS)
 418                   || (hsbPolicy == HORIZONTAL_SCROLLBAR_AS_NEEDED
 419                       && viewSize.width > (x3 - x2)));
 420
 421             if (!showVsb)
 422               x3 = x4;
 423
 424             if (!showHsb)
 425               y3 = y4;
 426
 427             // now set the layout
 428
 429             if (viewport != null)
 430               viewport.setBounds(new Rectangle(x2, y2, x3-x2, y3-y2));
 431
 432             if (colHead != null)
 433               colHead.setBounds(new Rectangle(x2, y1, x3-x2, y2-y1));
 434
 435             if (rowHead != null)
 436               rowHead.setBounds(new Rectangle(x1, y2, x2-x1, y3-y2));
 437
 438             if (showVsb)
 439               {
 440                 vsb.setVisible(true);
 441               vsb.setBounds(new Rectangle(x3, y2, x4-x3, y3-y2));
 442               }
 443             else if (vsb != null)
 444               vsb.setVisible(false);
 445
 446             if (showHsb)
 447               {
 448                 hsb.setVisible(true);
 449               hsb.setBounds(new Rectangle(x2, y3, x3-x2, y4-y3));
 450               }
 451             else if (hsb != null)
 452               hsb.setVisible(false);
 453
 454             if (upperLeft != null)
 455               upperLeft.setBounds(new Rectangle(x1, y1, x2-x1, y2-y1));
 456
 457             if (upperRight != null)
 458               upperRight.setBounds(new Rectangle(x3, y1, x4-x3, y2-y1));
 459
 460             if (lowerLeft != null)
 461               lowerLeft.setBounds(new Rectangle(x1, y3, x2-x1, y4-y3));
 462
 463             if (lowerRight != null)
 464               lowerRight.setBounds(new Rectangle(x3, y3, x4-x3, y4-y3));
 465
 466           }
 467       }
 468   }
 469
 470   public Rectangle getViewportBorderBounds(JScrollPane scrollPane) {
 471     return null;
 472   }
 473
 474
 475 }