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Package: NativeWidgetHelper$ImageRegistryServiceCustomizer
NativeWidgetHelper$ImageRegistryServiceCustomizer
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| addingService(ServiceReference) |
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| lambda$0(ImageRegistryService) |
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| lambda$1(ImageRegistryService) |
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| lambda$2() |
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| modifiedService(ServiceReference, ImageRegistryService) |
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| onUI(Runnable) |
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| removedService(ServiceReference, ImageRegistryService) |
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| updateImages(ImageRegistryService) |
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Coverage
1: /*******************************************************************************
2: * Copyright (c) 2011-2019 EclipseSource Muenchen GmbH and others.
3: *
4: * All rights reserved. This program and the accompanying materials
5: * are made available under the terms of the Eclipse Public License 2.0
6: * which accompanies this distribution, and is available at
7: * https://www.eclipse.org/legal/epl-2.0/
8: *
9: * SPDX-License-Identifier: EPL-2.0
10: *
11: * Contributors:
12: * jfaltermeier - initial API and implementation
13: * Christian W. Damus - bug 545686
14: ******************************************************************************/
15: /*******************************************************************************
16: * Copyright (c) 2006, 2014 Tom Schindl and others.
17: * All rights reserved. This program and the accompanying materials
18: * are made available under the terms of the Eclipse Public License 2.0
19: * which accompanies this distribution, and is available at
20: * https://www.eclipse.org/legal/epl-2.0/
21: *
22: * SPDX-License-Identifier: EPL-2.0
23: *
24: * Contributors:
25: * Tom Schindl <tom.schindl@bestsolution.at> - initial API and implementation
26: * Florian Potschka <signalrauschen@gmail.com> - Bug 260061
27: * Alexander Ljungberg <siker@norwinter.com> - Bug 260061
28: * Jeanderson Candido <http://jeandersonbc.github.io> - Bug 414565
29: *******************************************************************************/
30: package org.eclipse.emf.ecp.view.spi.table.celleditor.rcp;
31:
32: import java.util.concurrent.locks.Lock;
33: import java.util.concurrent.locks.ReentrantLock;
34:
35: import org.eclipse.emf.ecp.view.spi.util.swt.ImageRegistryService;
36: import org.eclipse.swt.SWT;
37: import org.eclipse.swt.graphics.Color;
38: import org.eclipse.swt.graphics.GC;
39: import org.eclipse.swt.graphics.Image;
40: import org.eclipse.swt.graphics.ImageData;
41: import org.eclipse.swt.graphics.Point;
42: import org.eclipse.swt.widgets.Button;
43: import org.eclipse.swt.widgets.Control;
44: import org.eclipse.swt.widgets.Display;
45: import org.eclipse.swt.widgets.Shell;
46: import org.osgi.framework.Bundle;
47: import org.osgi.framework.FrameworkUtil;
48: import org.osgi.framework.ServiceReference;
49: import org.osgi.util.tracker.ServiceTracker;
50: import org.osgi.util.tracker.ServiceTrackerCustomizer;
51:
52: /**
53: * Util class for faking native widgets.
54: *
55: * @author jfaltermeier
56: *
57: */
58: public final class NativeWidgetHelper {
59:
60: private static final String WS_CARBON = "carbon";//$NON-NLS-1$
61: private static final String WS_COCOA = "cocoa";//$NON-NLS-1$
62:
63: private static final String CHECKED_DEFAULT = "icons/checked.png"; //$NON-NLS-1$
64: private static final String UNCHECKED_DEFAULT = "icons/unchecked.png"; //$NON-NLS-1$
65:
66: private static final Lock LOCK = new ReentrantLock(true);
67: private static boolean initalized;
68:
69: private static final Bundle BUNDLE;
70: private static final ServiceTracker<ImageRegistryService, ImageRegistryService> IMAGE_REGISTRY_SERVICE_TRACKER;
71:
72: private static ImageData checked;
73: private static ImageData unchecked;
74:
75: private static Image defaultCheckedImage;
76: private static Image defaultUncheckedImage;
77:
78: static {
79: BUNDLE = FrameworkUtil.getBundle(NativeWidgetHelper.class);
80: IMAGE_REGISTRY_SERVICE_TRACKER = new ServiceTracker<>(BUNDLE.getBundleContext(), ImageRegistryService.class,
81: new ImageRegistryServiceCustomizer());
82: IMAGE_REGISTRY_SERVICE_TRACKER.open();
83: }
84:
85: private NativeWidgetHelper() {
86: // util
87: }
88:
89: /**
90: * Creates screenshots of the platform's native checkbox in checked and unchecked state. The images can be accessed
91: * via {@link NativeWidgetHelper#getCheckBoxImage(Control, CheckBoxState)}.
92: *
93: * @param control a control which provides the {@link org.eclipse.swt.widgets.Display Display} and {@link Shell} to
94: * create the screen shots
95: */
96: public static void initCheckBoxImages(Control control) {
97: try {
98: LOCK.lock();
99: if (!initalized) {
100: createCheckBoxImage(control, true);
101: createCheckBoxImage(control, false);
102: initalized = true;
103: }
104: } finally {
105: LOCK.unlock();
106: }
107: }
108:
109: /**
110: * Returns the image of a checkbox. If {@link NativeWidgetHelper#initCheckBoxImages(Control)} was called beforehand
111: * this will return images resembling the platform's native widgets. Otherwise a default image (Windows 7) will be
112: * returned.
113: *
114: * @param control a control which provides the {@link org.eclipse.swt.widgets.Display Display} to create the image
115: * @param state the state of the checkbox
116: * @return the image
117: */
118: public static Image getCheckBoxImage(Control control, CheckBoxState state) {
119: try {
120: LOCK.lock();
121: switch (state) {
122:
123: case checked:
124: if (checked != null) {
125: return new Image(control.getDisplay(), checked);
126: }
127: return defaultCheckedImage;
128: case unchecked:
129: if (unchecked != null) {
130: return new Image(control.getDisplay(), unchecked);
131: }
132: return defaultUncheckedImage;
133: default:
134: break;
135:
136: }
137: } finally {
138: LOCK.unlock();
139: }
140:
141: return null;
142:
143: }
144:
145: /**
146: * <p>
147: * Fills the image cache for checkboxes.
148: * </p>
149: * <p>
150: * This is based on org.eclipse.jface.snippets.viewers.Snippet061FakedNativeCellEditor
151: * </p>
152: *
153: * @param control the control
154: * @param type <code>true</code> for checked state, <code>false</code> otherwise
155: */
156: private static void createCheckBoxImage(Control control, boolean type) {
157: // Hopefully no platform uses exactly this color because we'll make
158: // it transparent in the image.
159:
160: final Display display = Display.getDefault();
161: final Color greenScreen = new Color(display, 3, 223, 7);
162:
163: final Shell shell = new Shell(control.getShell());
164: ImageData imageData = null;
165:
166: // otherwise we have a default gray color
167: shell.setBackground(greenScreen);
168:
169: if (isMac()) {
170: final Button button2 = new Button(shell, SWT.CHECK);
171: final Point bsize = button2.computeSize(SWT.DEFAULT, SWT.DEFAULT);
172:
173: // otherwise an image is stretched by width
174: bsize.x = Math.max(bsize.x - 1, bsize.y - 1);
175: bsize.y = Math.max(bsize.x - 1, bsize.y - 1);
176: button2.setSize(bsize);
177: button2.setLocation(100, 100);
178: }
179:
180: final Button button = new Button(shell, SWT.CHECK);
181: button.setBackground(greenScreen);
182: button.setSelection(type);
183:
184: // otherwise an image is located in a corner
185: button.setLocation(1, 1);
186: final Point bsize = button.computeSize(SWT.DEFAULT, SWT.DEFAULT);
187:
188: // otherwise an image is stretched by width
189: bsize.x = Math.max(bsize.x - 1, bsize.y - 1);
190: bsize.y = Math.max(bsize.x - 1, bsize.y - 1);
191: button.setSize(bsize);
192:
193: shell.setSize(bsize);
194: shell.setVisible(false);
195:
196: shell.open();
197:
198: final GC gc = new GC(shell);
199: final Image image = new Image(display, bsize.x, bsize.y);
200: gc.copyArea(image, 0, 0);
201: gc.dispose();
202: shell.close();
203:
204: imageData = image.getImageData();
205: imageData.transparentPixel = imageData.palette.getPixel(greenScreen
206: .getRGB());
207:
208: if (type) {
209: checked = imageData;
210: } else {
211: unchecked = imageData;
212: }
213:
214: image.dispose();
215: }
216:
217: private static boolean isMac() {
218: final String ws = SWT.getPlatform();
219: return WS_CARBON.equals(ws) || WS_COCOA.equals(ws);
220: }
221:
222: /**
223: * Enum describing the state of a checkbox.
224: *
225: * @author jfaltermeier
226: *
227: */
228: public enum CheckBoxState {
229: /**
230: * The enabled, visible, checked state.
231: */
232: checked,
233:
234: /**
235: * The enabled, visible, uncheched state.
236: */
237: unchecked
238: }
239:
240: /**
241: * Service-tracker customizer that uses the image-registry service, when it is
242: * discovered or updated, to get and cache the default checked and unchecked images.
243: */
244: private static final class ImageRegistryServiceCustomizer
245: implements ServiceTrackerCustomizer<ImageRegistryService, ImageRegistryService> {
246:
247: @Override
248: public ImageRegistryService addingService(ServiceReference<ImageRegistryService> reference) {
249: final ImageRegistryService result = BUNDLE.getBundleContext().getService(reference);
250:
251: onUI(() -> updateImages(result));
252:
253: return result;
254: }
255:
256: @Override
257: public void modifiedService(ServiceReference<ImageRegistryService> reference, ImageRegistryService service) {
258: onUI(() -> updateImages(service));
259: }
260:
261: @Override
262: public void removedService(ServiceReference<ImageRegistryService> reference, ImageRegistryService service) {
263: onUI(() -> updateImages(null));
264: }
265:
266: private void onUI(Runnable action) {
267: final Display display = Display.getCurrent();
268:• if (display != null) {
269: action.run();
270: } else {
271: Display.getDefault().syncExec(action);
272: }
273: }
274:
275: private void updateImages(ImageRegistryService imageRegistryService) {
276: LOCK.lock();
277:
278: try {
279:• if (imageRegistryService != null) {
280: defaultCheckedImage = imageRegistryService.getImage(BUNDLE, CHECKED_DEFAULT);
281: defaultUncheckedImage = imageRegistryService.getImage(BUNDLE, UNCHECKED_DEFAULT);
282: } else {
283: defaultCheckedImage = null;
284: defaultUncheckedImage = null;
285: }
286: } finally {
287: LOCK.unlock();
288: }
289: }
290: }
291: }