bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/color/ColorGradientAdjustingCanvas.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 java.util.ArrayList;\r
  15 import java.util.List;\r
  16 \r
  17 import org.eclipse.jface.viewers.ISelection;\r
  18 import org.eclipse.jface.viewers.ISelectionChangedListener;\r
  19 import org.eclipse.jface.viewers.ISelectionProvider;\r
  20 import org.eclipse.jface.viewers.SelectionChangedEvent;\r
  21 import org.eclipse.jface.viewers.StructuredSelection;\r
  22 import org.eclipse.swt.SWT;\r
  23 import org.eclipse.swt.events.MouseEvent;\r
  24 import org.eclipse.swt.events.MouseListener;\r
  25 import org.eclipse.swt.events.MouseMoveListener;\r
  26 import org.eclipse.swt.graphics.Color;\r
  27 import org.eclipse.swt.graphics.GC;\r
  28 import org.eclipse.swt.graphics.Image;\r
  29 import org.eclipse.swt.graphics.Rectangle;\r
  30 import org.eclipse.swt.widgets.Composite;\r
  31 import org.eclipse.swt.widgets.Display;\r
  32 \r
  33 /**\r
  34  * \r
  35  * Canvas that shows color gradients and color positions.\r
  36  * Without READ_ONLY style the canvas allows user to drag color positions.\r
  37  * \r
  38  * @author Marko Luukkainen\r
  39  *\r
  40  */\r
  41 public class ColorGradientAdjustingCanvas extends ColorGradientCanvas implements ISelectionProvider{\r
  42         \r
  43         ColorValue[] values;\r
  44         int last;\r
  45         int coords[];\r
  46         int size = 8;\r
  47         int sized2 = 4;\r
  48         int width;\r
  49         int height;\r
  50         \r
  51         int selectedValueIndex = -1;\r
  52         \r
  53         public ColorGradientAdjustingCanvas(Composite parent, int style) {\r
  54                 super(parent,style|SWT.DOUBLE_BUFFERED|SWT.NO_BACKGROUND);\r
  55                 addMouseListener(new MouseListener() {\r
  56                         \r
  57                         @Override\r
  58                         public void mouseUp(MouseEvent e) {\r
  59                                 \r
  60                         }\r
  61                         \r
  62                         @Override\r
  63                         public void mouseDown(MouseEvent e) {\r
  64                                 // store and reset selection\r
  65                                 int prev = selectedValueIndex;\r
  66                                 selectedValueIndex = -1;\r
  67                                 \r
  68                                 // locate closest ColorValue, and select it.\r
  69                                 int d = Integer.MAX_VALUE;\r
  70                                 for (int i = 0; i <= last; i++) {\r
  71                                         int x = coords[i*2];\r
  72                                 int y = coords[i*2+1];\r
  73                                 int dx = Math.abs(x - e.x);\r
  74                                 int dy = Math.abs(y - e.y);\r
  75                                 if ((dx < size) &&\r
  76                                         (dy < size)) {\r
  77                                         int dd = dx+dy;\r
  78                                         if (dd < d) {\r
  79                                                 selectedValueIndex = i;\r
  80                                                 d = dd;\r
  81                                         }\r
  82                                 }\r
  83                                 }\r
  84                                 // if selection was changed, update it.\r
  85                                 if (prev != selectedValueIndex) {\r
  86                                         updateSelection();\r
  87                                         redraw();\r
  88                                 }\r
  89                         }\r
  90                         \r
  91                         @Override\r
  92                         public void mouseDoubleClick(MouseEvent e) {\r
  93                                 \r
  94                         }\r
  95                 });\r
  96                 if ((style&SWT.READ_ONLY) == 0) {\r
  97                         addMouseMoveListener(new MouseMoveListener() {\r
  98                                 \r
  99                                 @Override\r
 100                                 public void mouseMove(MouseEvent e) {\r
 101                                         if ((e.stateMask & SWT.BUTTON1)>0) {\r
 102                                                 if (selectedValueIndex > 0 && selectedValueIndex < last) {\r
 103                                                         double d;\r
 104                                                         if ((ColorGradientAdjustingCanvas.this.style | SWT.HORIZONTAL) > 0) {\r
 105                                                                 d = (double)e.x/(double)width;\r
 106                                                         } else {\r
 107                                                                 d = (double)e.y/(double)height;\r
 108                                                         }\r
 109                                                         double r = max-min;\r
 110                                                         d *= r;\r
 111                                                         d += min;\r
 112                                                         double offset = r*0.015;\r
 113                                                         if (d <= values[selectedValueIndex-1].getValue()+offset)\r
 114                                                                 d = values[selectedValueIndex-1].getValue()+offset;\r
 115                                                         else if (d >= values[selectedValueIndex+1].getValue()-offset)\r
 116                                                                 d = values[selectedValueIndex+1].getValue()-offset;\r
 117                                                         values[selectedValueIndex]._setValue(d);\r
 118                                                         calculateCoords(width, height);\r
 119                                                         redraw();\r
 120                                                 }\r
 121                                         }\r
 122                                         \r
 123                                 }\r
 124                         });\r
 125                 }\r
 126 \r
 127         }\r
 128         \r
 129         public void setGradient(ColorGradient gradient) {\r
 130                 int prevSize = 0;\r
 131                 if (values != null)\r
 132                         prevSize = values.length;\r
 133                 \r
 134                 values = gradient.getColorValueArray();\r
 135                 last = values.length-1;\r
 136                 coords = new int[values.length*2];\r
 137                 super.setGradient(gradient);\r
 138                 if (selectedValueIndex >= 0 && prevSize != values.length) {\r
 139                         selectedValueIndex = -1;\r
 140                         updateSelection();\r
 141                 } else {\r
 142                         updateSelection();\r
 143                 }\r
 144         }\r
 145         \r
 146         double min;\r
 147         double max;\r
 148         \r
 149         private void calculateCoords(int width, int height) {\r
 150                 this.width = width;\r
 151                 this.height = height;\r
 152                 \r
 153                 min = values[0].getValue();\r
 154                 max = values[last].getValue();\r
 155                 \r
 156                 if ((ColorGradientAdjustingCanvas.this.style & SWT.HORIZONTAL) > 0) {\r
 157                         for (int i = 0; i <= last ; i++) {\r
 158                                 int y = height / 2;\r
 159                                 double d =  values[i].getValue();\r
 160                                 int x = (int)(((d-min)/(max-min))*(double)width);\r
 161                                 coords[i*2] = x;\r
 162                                 coords[i*2+1] = y;\r
 163                         }\r
 164                 } else {\r
 165                         for (int i = 0; i <= last ; i++) {\r
 166                                 int x = width / 2;\r
 167                                 double d =  values[i].getValue();\r
 168                                 int y = (int)(((d-min)/(max-min))*(double)height);\r
 169                                 coords[i*2] = x;\r
 170                                 coords[i*2+1] = y;\r
 171                         }\r
 172                 }\r
 173         }\r
 174 \r
 175         \r
 176         @Override\r
 177         protected void paintGradient(GC gc, Rectangle clip) {\r
 178                 if (values != null && values.length > 0) {\r
 179                         Image image = gradient.getGradientImage(clip.width,clip.height,ColorGradientAdjustingCanvas.this.style);\r
 180                         gc.drawImage(image, 0, 0);\r
 181                         image.dispose();        \r
 182                         calculateCoords(clip.width, clip.height);\r
 183 \r
 184                         Color white = new Color(gc.getDevice(), 255,255,255);\r
 185                         Color yellow = new Color(gc.getDevice(), 255,230,0);\r
 186                         Color black = new Color(gc.getDevice(), 0, 0, 0);\r
 187                         for (int i = 0; i <= last ; i++) {\r
 188                                 int x = coords[i*2];\r
 189                                 int y = coords[i*2+1];\r
 190                                 gc.setForeground(black);\r
 191                                 if (selectedValueIndex == i)\r
 192                                         gc.setBackground(yellow);\r
 193                                 else\r
 194                                         gc.setBackground(white);\r
 195                                 if (i == 0 || i == last ) {\r
 196                                         gc.fillRectangle(x-sized2, y-sized2, size, size);\r
 197                                         gc.drawRectangle(x-sized2, y-sized2, size, size);\r
 198                                 } else {\r
 199                                         gc.fillOval(x-sized2, y-sized2, size, size);\r
 200                                         gc.drawOval(x-sized2, y-sized2, size, size);\r
 201                                 }\r
 202                         }\r
 203                         \r
 204                         white.dispose();\r
 205                         black.dispose();\r
 206                         yellow.dispose();\r
 207                 } else {\r
 208                         gc.setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_WHITE));\r
 209                         gc.fillRectangle(clip);\r
 210                 }\r
 211         }\r
 212         \r
 213         private ISelection selection = new StructuredSelection();\r
 214         private List<ISelectionChangedListener> listeners = new ArrayList<>();\r
 215 \r
 216         @Override\r
 217         public void addSelectionChangedListener(ISelectionChangedListener listener) {\r
 218                 listeners.add(listener);\r
 219         }\r
 220 \r
 221         @Override\r
 222         public ISelection getSelection() {\r
 223         return selection;\r
 224         }\r
 225 \r
 226         @Override\r
 227         public void removeSelectionChangedListener(ISelectionChangedListener listener) {\r
 228                 listeners.remove(listener);\r
 229         }\r
 230 \r
 231         @Override\r
 232         public void setSelection(ISelection selection) {\r
 233                 ColorValue value = (ColorValue)((StructuredSelection)selection).getFirstElement();\r
 234                 selectedValueIndex = gradient.getColorValues().indexOf(value);\r
 235         }\r
 236         \r
 237         private void updateSelection() {\r
 238                 if (selectedValueIndex < 0)\r
 239                         selection = new StructuredSelection();\r
 240                 else\r
 241                         selection = new StructuredSelection(values[selectedValueIndex]);\r
 242                 \r
 243                 for (ISelectionChangedListener l : listeners) {\r
 244                         l.selectionChanged(new SelectionChangedEvent(this, selection));\r
 245                 }\r
 246         }\r
 247         \r
 248         public int getPointSize() {\r
 249                 return size;\r
 250         }\r
 251         \r
 252         public void setPointSize(int size) {\r
 253                 this.size = size;\r
 254                 this.sized2 = size/2;\r
 255         }\r
 256         \r
 257 \r
 258 }\r