1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.utils.ui.color;
14 import java.util.ArrayList;
15 import java.util.List;
17 import org.eclipse.jface.viewers.ISelection;
18 import org.eclipse.jface.viewers.ISelectionChangedListener;
19 import org.eclipse.jface.viewers.ISelectionProvider;
20 import org.eclipse.jface.viewers.SelectionChangedEvent;
21 import org.eclipse.jface.viewers.StructuredSelection;
22 import org.eclipse.swt.SWT;
23 import org.eclipse.swt.events.MouseEvent;
24 import org.eclipse.swt.events.MouseListener;
25 import org.eclipse.swt.events.MouseMoveListener;
26 import org.eclipse.swt.graphics.Color;
27 import org.eclipse.swt.graphics.GC;
28 import org.eclipse.swt.graphics.Image;
29 import org.eclipse.swt.graphics.Rectangle;
30 import org.eclipse.swt.widgets.Composite;
31 import org.eclipse.swt.widgets.Display;
35 * Canvas that shows color gradients and color positions.
36 * Without READ_ONLY style the canvas allows user to drag color positions.
38 * @author Marko Luukkainen
41 public class ColorGradientAdjustingCanvas extends ColorGradientCanvas implements ISelectionProvider{
51 int selectedValueIndex = -1;
53 public ColorGradientAdjustingCanvas(Composite parent, int style) {
54 super(parent,style|SWT.DOUBLE_BUFFERED|SWT.NO_BACKGROUND);
55 addMouseListener(new MouseListener() {
58 public void mouseUp(MouseEvent e) {
63 public void mouseDown(MouseEvent e) {
64 // store and reset selection
65 int prev = selectedValueIndex;
66 selectedValueIndex = -1;
68 // locate closest ColorValue, and select it.
69 int d = Integer.MAX_VALUE;
70 for (int i = 0; i <= last; i++) {
72 int y = coords[i*2+1];
73 int dx = Math.abs(x - e.x);
74 int dy = Math.abs(y - e.y);
79 selectedValueIndex = i;
84 // if selection was changed, update it.
85 if (prev != selectedValueIndex) {
92 public void mouseDoubleClick(MouseEvent e) {
96 if ((style&SWT.READ_ONLY) == 0) {
97 addMouseMoveListener(new MouseMoveListener() {
100 public void mouseMove(MouseEvent e) {
101 if ((e.stateMask & SWT.BUTTON1)>0) {
102 if (selectedValueIndex > 0 && selectedValueIndex < last) {
104 if ((ColorGradientAdjustingCanvas.this.style | SWT.HORIZONTAL) > 0) {
105 d = (double)e.x/(double)width;
107 d = (double)e.y/(double)height;
112 double offset = r*0.015;
113 if (d <= values[selectedValueIndex-1].getValue()+offset)
114 d = values[selectedValueIndex-1].getValue()+offset;
115 else if (d >= values[selectedValueIndex+1].getValue()-offset)
116 d = values[selectedValueIndex+1].getValue()-offset;
117 values[selectedValueIndex]._setValue(d);
118 calculateCoords(width, height);
129 public void setGradient(ColorGradient gradient) {
132 prevSize = values.length;
134 values = gradient.getColorValueArray();
135 last = values.length-1;
136 coords = new int[values.length*2];
137 super.setGradient(gradient);
138 if (selectedValueIndex >= 0 && prevSize != values.length) {
139 selectedValueIndex = -1;
149 private void calculateCoords(int width, int height) {
151 this.height = height;
153 min = values[0].getValue();
154 max = values[last].getValue();
156 if ((ColorGradientAdjustingCanvas.this.style & SWT.HORIZONTAL) > 0) {
157 for (int i = 0; i <= last ; i++) {
159 double d = values[i].getValue();
160 int x = (int)(((d-min)/(max-min))*(double)width);
165 for (int i = 0; i <= last ; i++) {
167 double d = values[i].getValue();
168 int y = (int)(((d-min)/(max-min))*(double)height);
177 protected void paintGradient(GC gc, Rectangle clip) {
178 if (values != null && values.length > 0) {
179 Image image = gradient.getGradientImage(clip.width,clip.height,ColorGradientAdjustingCanvas.this.style);
180 gc.drawImage(image, 0, 0);
182 calculateCoords(clip.width, clip.height);
184 Color white = new Color(gc.getDevice(), 255,255,255);
185 Color yellow = new Color(gc.getDevice(), 255,230,0);
186 Color black = new Color(gc.getDevice(), 0, 0, 0);
187 for (int i = 0; i <= last ; i++) {
189 int y = coords[i*2+1];
190 gc.setForeground(black);
191 if (selectedValueIndex == i)
192 gc.setBackground(yellow);
194 gc.setBackground(white);
195 if (i == 0 || i == last ) {
196 gc.fillRectangle(x-sized2, y-sized2, size, size);
197 gc.drawRectangle(x-sized2, y-sized2, size, size);
199 gc.fillOval(x-sized2, y-sized2, size, size);
200 gc.drawOval(x-sized2, y-sized2, size, size);
208 gc.setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_WHITE));
209 gc.fillRectangle(clip);
213 private ISelection selection = new StructuredSelection();
214 private List<ISelectionChangedListener> listeners = new ArrayList<>();
217 public void addSelectionChangedListener(ISelectionChangedListener listener) {
218 listeners.add(listener);
222 public ISelection getSelection() {
227 public void removeSelectionChangedListener(ISelectionChangedListener listener) {
228 listeners.remove(listener);
232 public void setSelection(ISelection selection) {
233 ColorValue value = (ColorValue)((StructuredSelection)selection).getFirstElement();
234 selectedValueIndex = gradient.getColorValues().indexOf(value);
237 private void updateSelection() {
238 if (selectedValueIndex < 0)
239 selection = new StructuredSelection();
241 selection = new StructuredSelection(values[selectedValueIndex]);
243 for (ISelectionChangedListener l : listeners) {
244 l.selectionChanged(new SelectionChangedEvent(this, selection));
248 public int getPointSize() {
252 public void setPointSize(int size) {
254 this.sized2 = size/2;