bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/color/ColorComposite.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.utils.ui.color;\r
  13 \r
  14 import org.eclipse.jface.layout.GridDataFactory;\r
  15 import org.eclipse.jface.layout.GridLayoutFactory;\r
  16 import org.eclipse.swt.SWT;\r
  17 import org.eclipse.swt.events.ModifyEvent;\r
  18 import org.eclipse.swt.events.ModifyListener;\r
  19 import org.eclipse.swt.events.MouseEvent;\r
  20 import org.eclipse.swt.events.MouseListener;\r
  21 import org.eclipse.swt.events.MouseMoveListener;\r
  22 import org.eclipse.swt.events.SelectionAdapter;\r
  23 import org.eclipse.swt.events.SelectionEvent;\r
  24 import org.eclipse.swt.graphics.GC;\r
  25 import org.eclipse.swt.graphics.Rectangle;\r
  26 import org.eclipse.swt.layout.GridLayout;\r
  27 import org.eclipse.swt.widgets.Button;\r
  28 import org.eclipse.swt.widgets.Composite;\r
  29 import org.eclipse.swt.widgets.Label;\r
  30 import org.eclipse.swt.widgets.TabFolder;\r
  31 import org.eclipse.swt.widgets.TabItem;\r
  32 import org.eclipse.swt.widgets.Text;\r
  33 \r
  34 /**\r
  35  * \r
  36  * Widget to edit colors\r
  37  * \r
  38  * @author Marko Luukkainen\r
  39  *\r
  40  */\r
  41 public class ColorComposite extends Composite{\r
  42         \r
  43         \r
  44         private Color color;\r
  45         private ColorGradient rGradient;\r
  46         private ColorGradient gGradient;\r
  47         private ColorGradient bGradient;\r
  48         private ColorGradient hGradient;\r
  49         private ColorGradient sGradient;\r
  50         private ColorGradient vGradient;\r
  51         private ColorGradient colorGradient;\r
  52         \r
  53         TabFolder tabFolder;\r
  54         \r
  55         Text rText;\r
  56         Text gText;\r
  57         Text bText;\r
  58         IntGradientWidget rCanvas;\r
  59         IntGradientWidget gCanvas;\r
  60         IntGradientWidget bCanvas;\r
  61         ColorGradientCanvas colorCanvas;\r
  62         \r
  63         Text hText;\r
  64         Text sText;\r
  65         Text vText;\r
  66         GradientWidget hCanvas;\r
  67         GradientWidget sCanvas;\r
  68         GradientWidget vCanvas;\r
  69         \r
  70         Button dynamicButton;\r
  71         \r
  72         boolean dynamic = true;\r
  73         \r
  74         \r
  75         public ColorComposite(Composite parent, int style) {\r
  76                 super(parent,style);\r
  77                 \r
  78                 GridLayout layout = new GridLayout();\r
  79                 layout.makeColumnsEqualWidth = true;\r
  80                 layout.numColumns = 1;\r
  81                 this.setLayout(layout);\r
  82                 \r
  83                 colorCanvas = new ColorGradientCanvas(this,SWT.BORDER|SWT.HORIZONTAL);\r
  84                 \r
  85                 tabFolder = new TabFolder(this, SWT.NONE);\r
  86                 \r
  87                 TabItem rgbTab = new TabItem(tabFolder, SWT.NONE);\r
  88                 rgbTab.setText("RGB");\r
  89                 Composite rgbComposite = new Composite(tabFolder, SWT.NONE);\r
  90                 \r
  91                 rgbTab.setControl(rgbComposite);\r
  92                 \r
  93                 Label rLabel = new Label(rgbComposite,SWT.NONE);\r
  94                 rLabel.setText("Red");\r
  95                 rCanvas = new IntGradientWidget(rgbComposite,SWT.BORDER|SWT.HORIZONTAL){\r
  96                         @Override\r
  97                         protected void updatePosition(int value) {\r
  98                                 Color newColor = new Color(value,color.getG(),color.getB());\r
  99                                 setColor(newColor);\r
 100                         }\r
 101                 };\r
 102                 rText = new Text(rgbComposite,SWT.BORDER);\r
 103                 rText.addModifyListener(new IntColorModifyListener() {\r
 104                         \r
 105                         @Override\r
 106                         void setValue(int value) {\r
 107                                 Color newColor = new Color(value,color.getG(),color.getB());\r
 108                                 setColor(newColor);\r
 109                         }\r
 110                 });\r
 111                 \r
 112                 Label gLabel = new Label(rgbComposite,SWT.NONE);\r
 113                 gLabel.setText("Green");\r
 114                 gCanvas = new IntGradientWidget(rgbComposite,SWT.BORDER|SWT.HORIZONTAL) {\r
 115                         @Override\r
 116                         protected void updatePosition(int value) {\r
 117                                 Color newColor = new Color(color.getR(),value,color.getB());\r
 118                                 setColor(newColor);\r
 119                         }\r
 120                 };\r
 121                 gText = new Text(rgbComposite,SWT.BORDER);\r
 122                 gText.addModifyListener(new IntColorModifyListener() {\r
 123                         \r
 124                         @Override\r
 125                         void setValue(int value) {\r
 126                                 Color newColor = new Color(color.getR(),value,color.getB());\r
 127                                 setColor(newColor);\r
 128                         }\r
 129                 });\r
 130                 \r
 131                 Label bLabel = new Label(rgbComposite,SWT.NONE);\r
 132                 bLabel.setText("Blue");\r
 133                 bCanvas = new IntGradientWidget(rgbComposite,SWT.BORDER|SWT.HORIZONTAL) {\r
 134                         @Override\r
 135                         protected void updatePosition(int value) {\r
 136                                 Color newColor = new Color(color.getR(),color.getG(),value);\r
 137                                 setColor(newColor);\r
 138                         }\r
 139                 };\r
 140                 bText = new Text(rgbComposite,SWT.BORDER);\r
 141                 bText.addModifyListener(new IntColorModifyListener() {\r
 142                         \r
 143                         @Override\r
 144                         void setValue(int value) {\r
 145                                 Color newColor = new Color(color.getR(),color.getG(),value);\r
 146                                 setColor(newColor);\r
 147                         }\r
 148                 });\r
 149                 \r
 150                 TabItem hsvTab = new TabItem(tabFolder, SWT.NONE);\r
 151                 hsvTab.setText("HSV");\r
 152                 Composite hsvComposite = new Composite(tabFolder, SWT.NONE);\r
 153                 \r
 154                 hsvTab.setControl(hsvComposite);\r
 155                 \r
 156                 Label hLabel = new Label(hsvComposite,SWT.NONE);\r
 157                 hLabel.setText("Hue");\r
 158                 hCanvas = new GradientWidget(hsvComposite,SWT.BORDER|SWT.HORIZONTAL) {\r
 159                         @Override\r
 160                         protected boolean updatePosition(double d) {\r
 161                                 Color newColor = new Color(d*360.0,color.getS(),color.getV());\r
 162                                 setColor(newColor);\r
 163                                 return true;\r
 164                         }\r
 165                         \r
 166                         @Override\r
 167                         protected void setPosition(double d) {\r
 168                                 super.setPosition(d/360.0);\r
 169                         }\r
 170                 };\r
 171                 hText = new Text(hsvComposite,SWT.BORDER);\r
 172                 hText.addModifyListener(new DoubleColorModifyListener(0.,360.) {\r
 173                         \r
 174                         @Override\r
 175                         void setValue(double value) {\r
 176                                 Color newColor = new Color(value,color.getS(),color.getV());\r
 177                                 setColor(newColor);\r
 178                         }\r
 179                 });\r
 180                 \r
 181                 Label sLabel = new Label(hsvComposite,SWT.NONE);\r
 182                 sLabel.setText("Saturation");\r
 183                 sCanvas = new GradientWidget(hsvComposite,SWT.BORDER|SWT.HORIZONTAL) {\r
 184                         @Override\r
 185                         protected boolean updatePosition(double d) {\r
 186                                 Color newColor = new Color(color.getH(),d,color.getV());\r
 187                                 setColor(newColor);\r
 188                                 return true;\r
 189                         }\r
 190                 };\r
 191                 sText = new Text(hsvComposite,SWT.BORDER);\r
 192                 sText.addModifyListener(new DoubleColorModifyListener(0.,1.) {\r
 193                         \r
 194                         @Override\r
 195                         void setValue(double value) {\r
 196                                 Color newColor = new Color(color.getH(),value,color.getV());\r
 197                                 setColor(newColor);\r
 198                         }\r
 199                 });\r
 200                 \r
 201                 Label vLabel = new Label(hsvComposite,SWT.NONE);\r
 202                 vLabel.setText("Value");\r
 203                 vCanvas = new GradientWidget(hsvComposite,SWT.BORDER|SWT.HORIZONTAL) {\r
 204                         @Override\r
 205                         protected boolean updatePosition(double d) {\r
 206                                 Color newColor = new Color(color.getH(),color.getS(),d);\r
 207                                 setColor(newColor);\r
 208                                 return true;\r
 209                         }\r
 210                 };\r
 211                 vText = new Text(hsvComposite,SWT.BORDER);\r
 212                 vText.addModifyListener(new DoubleColorModifyListener(0.,1.) {\r
 213                         \r
 214                         @Override\r
 215                         void setValue(double value) {\r
 216                                 Color newColor = new Color(color.getH(),color.getS(),value);\r
 217                                 setColor(newColor);\r
 218                         }\r
 219                 });\r
 220                 \r
 221                 TabItem settingsTab = new TabItem(tabFolder, SWT.NONE);\r
 222                 settingsTab.setText("Settings");\r
 223                 Composite settingsComposite = new Composite(tabFolder, SWT.NONE);\r
 224                 \r
 225                 settingsTab.setControl(settingsComposite);\r
 226                 \r
 227                 dynamicButton = new Button(settingsComposite, SWT.CHECK);\r
 228                 dynamicButton.setText("Dynamic widgets");\r
 229                 dynamicButton.setSelection(dynamic);\r
 230                 dynamicButton.addSelectionListener(new SelectionAdapter() {\r
 231                         @Override\r
 232                         public void widgetSelected(SelectionEvent e) {\r
 233                                 dynamic = dynamicButton.getSelection();\r
 234                                 updateWidgets();\r
 235                         }\r
 236                 });\r
 237 \r
 238                 GridLayoutFactory.fillDefaults().numColumns(3).equalWidth(false).applyTo(rgbComposite);\r
 239                 GridLayoutFactory.fillDefaults().numColumns(3).equalWidth(false).applyTo(hsvComposite);\r
 240                 GridLayoutFactory.fillDefaults().numColumns(3).equalWidth(false).applyTo(settingsComposite);\r
 241                 GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.TOP).applyTo(rgbComposite);\r
 242                 GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.TOP).applyTo(hsvComposite);\r
 243                 GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.TOP).applyTo(settingsComposite);\r
 244                 GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.TOP).applyTo(tabFolder);\r
 245                 \r
 246                 GridDataFactory.fillDefaults().hint(-1, 32).grab(true, false).align(SWT.FILL, SWT.TOP).applyTo(colorCanvas);\r
 247                 GridDataFactory.fillDefaults().hint(-1, 16).grab(true, false).align(SWT.FILL, SWT.TOP).applyTo(rCanvas);\r
 248                 GridDataFactory.fillDefaults().hint(-1, 16).grab(true, false).align(SWT.FILL, SWT.TOP).applyTo(gCanvas);\r
 249                 GridDataFactory.fillDefaults().hint(-1, 16).grab(true, false).align(SWT.FILL, SWT.TOP).applyTo(bCanvas);\r
 250                 GridDataFactory.fillDefaults().hint(-1, 16).grab(true, false).align(SWT.FILL, SWT.TOP).applyTo(hCanvas);\r
 251                 GridDataFactory.fillDefaults().hint(-1, 16).grab(true, false).align(SWT.FILL, SWT.TOP).applyTo(sCanvas);\r
 252                 GridDataFactory.fillDefaults().hint(-1, 16).grab(true, false).align(SWT.FILL, SWT.TOP).applyTo(vCanvas);\r
 253                 GridDataFactory.fillDefaults().hint(20, 15).grab(false, false).applyTo(rText);\r
 254                 GridDataFactory.fillDefaults().hint(20, 15).grab(false, false).applyTo(gText);\r
 255                 GridDataFactory.fillDefaults().hint(20, 15).grab(false, false).applyTo(bText);\r
 256                 GridDataFactory.fillDefaults().hint(20, 15).grab(false, false).applyTo(hText);\r
 257                 GridDataFactory.fillDefaults().hint(20, 15).grab(false, false).applyTo(sText);\r
 258                 GridDataFactory.fillDefaults().hint(20, 15).grab(false, false).applyTo(vText);\r
 259                 \r
 260                 if (color == null)\r
 261                         setColor(new Color(255,255,255));\r
 262                 else\r
 263                         setColor(color);\r
 264         }\r
 265         \r
 266         private abstract class IntColorModifyListener implements ModifyListener {\r
 267                 boolean modify = false;\r
 268                 @Override\r
 269                 public void modifyText(ModifyEvent e) {\r
 270                         if (internalUpdate)\r
 271                                 return;\r
 272                         if (modify)\r
 273                                 return;\r
 274                         modify = true;\r
 275                         Text text = (Text)e.widget;\r
 276                         try {\r
 277                                 int value = Integer.parseInt(text.getText());\r
 278                                 if (value < 0)\r
 279                                         value = 0;\r
 280                                 if (value > 255)\r
 281                                         value = 255;\r
 282                                 setValue(value);\r
 283                         } catch (NumberFormatException err) {\r
 284                                 \r
 285                         }\r
 286                         modify = false;\r
 287                         \r
 288                 }\r
 289                 \r
 290                 abstract void setValue(int value);\r
 291         }\r
 292 \r
 293         private abstract class DoubleColorModifyListener implements ModifyListener {\r
 294                 boolean modify = false;\r
 295                 double min;\r
 296                 double max;\r
 297                 \r
 298                 public DoubleColorModifyListener( double min, double max) {\r
 299                         this.min = min;\r
 300                         this.max = max;\r
 301                 }\r
 302                 \r
 303                 @Override\r
 304                 public void modifyText(ModifyEvent e) {\r
 305                         if (internalUpdate)\r
 306                                 return;\r
 307                         if (modify)\r
 308                                 return;\r
 309                         modify = true;\r
 310                         Text text = (Text)e.widget;\r
 311                         try {\r
 312                                 double value = Integer.parseInt(text.getText());\r
 313                                 if (value < min) {\r
 314                                         value = min;\r
 315                                 } else if (value > max)\r
 316                                         value = max;\r
 317                                 setValue(value);\r
 318                         } catch (NumberFormatException err) {\r
 319                                 \r
 320                         }\r
 321                         modify = false;                 \r
 322                 }\r
 323 \r
 324                 \r
 325                 abstract void setValue(double value);\r
 326         }\r
 327         \r
 328         public void setColor(Color color) {\r
 329                 this.color = color;\r
 330                 updateWidgets();\r
 331         }\r
 332         \r
 333         public Color getColor() {\r
 334                 return color;\r
 335         }\r
 336         \r
 337         private void updateGradients() {\r
 338                 if (dynamic) {\r
 339                         rGradient = new ColorGradient(new ColorValue[]{\r
 340                                                 new ColorValue(new Color(0,color.getG(),color.getB()),0.0),\r
 341                                                 new ColorValue(new Color(255,color.getG(),color.getB()),1.0)});\r
 342                         gGradient = new ColorGradient(new ColorValue[]{\r
 343                                         new ColorValue(new Color(color.getR(),0,color.getB()),0.0),\r
 344                                         new ColorValue(new Color(color.getR(),255,color.getB()),1.0)});\r
 345                         bGradient = new ColorGradient(new ColorValue[]{\r
 346                                         new ColorValue(new Color(color.getR(),color.getG(),0),0.0),\r
 347                                         new ColorValue(new Color(color.getR(),color.getG(),255),1.0)});\r
 348                         // hue is interpolated along the shortest route, using just 0 and 360 would result in constant color. \r
 349                         hGradient = new ColorGradient(new ColorValue[]{\r
 350                                         new ColorValue(new Color(0.0,color.getS(),color.getV()),0.0),\r
 351                                         new ColorValue(new Color(90.0,color.getS(),color.getV()),0.25),\r
 352                                         new ColorValue(new Color(180.0,color.getS(),color.getV()),0.5),\r
 353                                         new ColorValue(new Color(270.0,color.getS(),color.getV()),0.75),\r
 354                                         new ColorValue(new Color(360.0,color.getS(),color.getV()),1.0)}, ColorGradient.HSV);\r
 355                         sGradient = new ColorGradient(new ColorValue[]{\r
 356                                         new ColorValue(new Color(color.getH(),0.0,color.getV()),0.0),\r
 357                                         new ColorValue(new Color(color.getH(),1.0,color.getV()),1.0)}, ColorGradient.HSV);\r
 358                         vGradient = new ColorGradient(new ColorValue[]{\r
 359                                         new ColorValue(new Color(color.getH(),color.getS(),0.0),0.0),\r
 360                                         new ColorValue(new Color(color.getH(),color.getS(),1.0),1.0)}, ColorGradient.HSV);\r
 361                 } else {\r
 362                         rGradient = new ColorGradient(new ColorValue[]{\r
 363                                         new ColorValue(new Color(0,0,0),0.0),\r
 364                                         new ColorValue(new Color(255,0,0),1.0)});\r
 365                         gGradient = new ColorGradient(new ColorValue[]{\r
 366                                         new ColorValue(new Color(0,0,0),0.0),\r
 367                                         new ColorValue(new Color(0,255,0),1.0)});\r
 368                         bGradient = new ColorGradient(new ColorValue[]{\r
 369                                         new ColorValue(new Color(0,0,0),0.0),\r
 370                                         new ColorValue(new Color(0,0,255),1.0)});\r
 371                         // hue is interpolated along the shortest route, using just 0 and 360 would result in constant color. \r
 372                         hGradient = new ColorGradient(new ColorValue[]{\r
 373                                         new ColorValue(new Color(0.0,1.0,1.0),0.0),\r
 374                                         new ColorValue(new Color(90.0,1.0,1.0),0.25),\r
 375                                         new ColorValue(new Color(180.0,1.0,1.0),0.5),\r
 376                                         new ColorValue(new Color(270.0,1.0,1.0),0.75),\r
 377                                         new ColorValue(new Color(360.0,1.0,1.0),1.0)}, ColorGradient.HSV);\r
 378                         sGradient = new ColorGradient(new ColorValue[]{\r
 379                                         new ColorValue(new Color(color.getH(),0.0,1.0),0.0),\r
 380                                         new ColorValue(new Color(color.getH(),1.0,1.0),1.0)}, ColorGradient.HSV);\r
 381                         vGradient = new ColorGradient(new ColorValue[]{\r
 382                                         new ColorValue(new Color(color.getH(),1.0,0.0),0.0),\r
 383                                         new ColorValue(new Color(color.getH(),1.0,1.0),1.0)}, ColorGradient.HSV);\r
 384                 }\r
 385                 \r
 386                 colorGradient = new ColorGradient(new ColorValue[]{\r
 387                                 new ColorValue(new Color(color.getR(),color.getG(),color.getB()),0.0)});\r
 388         \r
 389         }\r
 390         \r
 391         private boolean internalUpdate = false;\r
 392         \r
 393         private void updateWidgets() {\r
 394                 if (internalUpdate)\r
 395                         return;\r
 396                 internalUpdate = true;\r
 397                 updateGradients();\r
 398                 rCanvas.setGradient(rGradient);\r
 399                 gCanvas.setGradient(gGradient);\r
 400                 bCanvas.setGradient(bGradient);\r
 401                 hCanvas.setGradient(hGradient);\r
 402                 sCanvas.setGradient(sGradient);\r
 403                 vCanvas.setGradient(vGradient);\r
 404                 colorCanvas.setGradient(colorGradient);\r
 405                 \r
 406                 rCanvas.setPosition(color.getR());\r
 407                 gCanvas.setPosition(color.getG());\r
 408                 bCanvas.setPosition(color.getB());\r
 409                 hCanvas.setPosition(color.getH());\r
 410                 sCanvas.setPosition(color.getS());\r
 411                 vCanvas.setPosition(color.getV());\r
 412                 \r
 413                 if(!rText.isFocusControl())\r
 414                         rText.setText(Integer.toString(color.getR()));\r
 415                 if(!gText.isFocusControl())\r
 416                         gText.setText(Integer.toString(color.getG()));\r
 417                 if(!bText.isFocusControl())\r
 418                         bText.setText(Integer.toString(color.getB()));\r
 419                 if(!hText.isFocusControl())\r
 420                         hText.setText(Double.toString(color.getH()));\r
 421                 if(!sText.isFocusControl())\r
 422                         sText.setText(Double.toString(color.getS()));\r
 423                 if(!vText.isFocusControl())\r
 424                         vText.setText(Double.toString(color.getV()));   \r
 425                 internalUpdate = false;\r
 426         }\r
 427         \r
 428         private abstract static class IntGradientWidget extends GradientWidget {\r
 429 \r
 430                 public IntGradientWidget(Composite parent, int style) {\r
 431                         super(parent, style);\r
 432                 }\r
 433                 \r
 434                 @Override\r
 435                 protected boolean updatePosition(double d) {\r
 436                         int value = (int)(d * 255);\r
 437                         if (value < 0)\r
 438                                 value = 0;\r
 439                         if (value > 255)\r
 440                                 value = 255;\r
 441                         updatePosition(value);\r
 442                         return true;\r
 443                 }\r
 444                 protected abstract void updatePosition(int value);\r
 445                 \r
 446                 protected void setPosition(int value) {\r
 447                         double d = ((double)value)/255.0;\r
 448                         setPosition(d);\r
 449                 }\r
 450                 \r
 451         }\r
 452         \r
 453         private abstract static class GradientWidget extends ColorGradientCanvas {\r
 454 \r
 455                 int pos = -1;\r
 456                 double posD = -1.0;\r
 457                 \r
 458                 int size = 8;\r
 459                 int sized2 = 4;\r
 460                 \r
 461                 \r
 462                 \r
 463                 public GradientWidget(Composite parent, int style) {\r
 464                         super(parent, style);\r
 465                         this.addMouseListener(new MouseListener() {                     \r
 466                                 @Override\r
 467                                 public void mouseDown(MouseEvent e) {\r
 468                                         if (e.button == 1) {\r
 469                                                 update(e);\r
 470                                         }\r
 471                                 }\r
 472                                 \r
 473                                 @Override\r
 474                                 public void mouseUp(MouseEvent e) {}\r
 475                                 @Override\r
 476                                 public void mouseDoubleClick(MouseEvent e) {}\r
 477                         });\r
 478                         this.addMouseMoveListener(new MouseMoveListener() {\r
 479                                 \r
 480                                 @Override\r
 481                                 public void mouseMove(MouseEvent e) {\r
 482                                         if ((e.stateMask & SWT.BUTTON1)>0) {\r
 483                                                 update(e);\r
 484                                         }\r
 485                                 }\r
 486                         });\r
 487                 }\r
 488                 \r
 489                 protected void update(MouseEvent e) {\r
 490                         Rectangle r = getClientArea();\r
 491                         double d;\r
 492                         if ((style & SWT.HORIZONTAL) > 0) {\r
 493                                 d = (double)e.x / (double)r.width;\r
 494                         } else {\r
 495                                 d = (double)e.y / (double)r.height;\r
 496                         }\r
 497                         if (d < 0.0)\r
 498                                 d = 0.0;\r
 499                         else if (d > 1.0)\r
 500                                 d = 1.0;\r
 501                         if (updatePosition(d)) {\r
 502                                 if ((style & SWT.HORIZONTAL) > 0) {\r
 503                                         pos = (int)(d*((double)r.width));\r
 504                                 } else {\r
 505                                         pos = (int)(d*((double)r.height));\r
 506                                 }\r
 507                                 posD = d;\r
 508                         }\r
 509                 }\r
 510                 \r
 511                 protected abstract boolean updatePosition(double d);\r
 512                 \r
 513                 protected void setPosition(double d) {\r
 514                         if (d == posD)\r
 515                                 return;\r
 516                         _setPosition(d);                                                \r
 517                 }\r
 518                 \r
 519                 private void _setPosition(double d) {\r
 520                         Rectangle r = getClientArea();\r
 521                         posD = d;\r
 522                         if (posD >= 0.0) {\r
 523                                 if ((style & SWT.HORIZONTAL) > 0) {\r
 524                                         pos = (int)(d * (double)r.width);\r
 525                                 } else {\r
 526                                         pos = (int)(d * (double)r.height);\r
 527                                 }\r
 528                         } else {\r
 529                                 pos = -1;\r
 530                         }\r
 531                 }\r
 532                 \r
 533                 Rectangle prevClip;\r
 534                 @Override\r
 535                 protected void paintGradient(GC gc, Rectangle clip) {\r
 536                         super.paintGradient(gc, clip);\r
 537                         if (!clip.equals(prevClip)) {\r
 538                                 prevClip = clip;\r
 539                                 _setPosition(posD);\r
 540                         }\r
 541                         \r
 542                         if (pos >= 0) {\r
 543                                 org.eclipse.swt.graphics.Color white = new org.eclipse.swt.graphics.Color(gc.getDevice(), 255,255,255);\r
 544                                 org.eclipse.swt.graphics.Color black = new org.eclipse.swt.graphics.Color(gc.getDevice(), 0, 0, 0);\r
 545                                 gc.setForeground(black);\r
 546                                 gc.setBackground(white);\r
 547                                 int x;\r
 548                                 int y;\r
 549                                 if ((style & SWT.HORIZONTAL) > 0) {\r
 550                                         x = pos;\r
 551                                         y = clip.height / 2;\r
 552                                 } else {\r
 553                                         x = clip.width / 2;\r
 554                                         y = pos;\r
 555                                 }\r
 556                                 gc.fillOval(x-sized2, y-sized2, size, size);\r
 557                                 gc.drawOval(x-sized2, y-sized2, size, size);\r
 558                                 \r
 559                                 white.dispose();\r
 560                                 black.dispose();\r
 561                         }\r
 562                 }\r
 563                 \r
 564         }\r
 565 }\r