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Package: EMFFormsSWTLayoutDelayed
EMFFormsSWTLayoutDelayed
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| EMFFormsSWTLayoutDelayed() |
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| exchangeRequestedLayouts() |
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| getReportService() |
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| getRequestedLayouts() |
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| lambda$0(Display) |
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| lambda$1(Set) |
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| layout(Composite) |
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| layoutDelayed() |
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| setRequestedLayouts(Set) |
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Coverage
1: /*******************************************************************************
2: * Copyright (c) 2011-2017 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: * Eugen Neufeld - initial API and implementation
13: ******************************************************************************/
14: package org.eclipse.emfforms.spi.swt.core.layout;
15:
16: import java.util.LinkedHashSet;
17: import java.util.Set;
18:
19: import org.eclipse.emfforms.spi.common.report.AbstractReport;
20: import org.eclipse.emfforms.spi.common.report.ReportService;
21: import org.eclipse.swt.widgets.Composite;
22: import org.eclipse.swt.widgets.Display;
23: import org.osgi.framework.Bundle;
24: import org.osgi.framework.BundleContext;
25: import org.osgi.framework.FrameworkUtil;
26: import org.osgi.framework.ServiceReference;
27:
28: /**
29: * This Layout Optimizer caches the incoming layout request for 200ms before triggering the layout.
30: *
31: * @author Eugen Neufeld
32: * @since 1.12
33: *
34: */
35: public class EMFFormsSWTLayoutDelayed implements EMFFormsSWTLayoutOptimizer {
36:
37: private Set<Composite> requestedLayouts = new LinkedHashSet<Composite>();
38: private Thread thread;
39: private ReportService reportService;
40:
41: /**
42: * <p>
43: * This method will collect layoutrequest that happen in the same 200ms. When there are multiple layoutrequest for
44: * the same composite in this time frame, the composite will only be layouted once.
45: * </p>
46: * <p>
47: * This will help to improve performance as layout request are usually expensive. Also it might be quite common that
48: * e.g. multiple hide rules are triggered by the same condition.
49: * </p>
50: *
51: * @param parent the composite to layout
52: */
53: @Override
54: public synchronized void layout(Composite parent) {
55: getRequestedLayouts().add(parent);
56: layoutDelayed();
57: }
58:
59: private synchronized void layoutDelayed() {
60:• if (thread != null || getRequestedLayouts().isEmpty()) {
61: return;
62: }
63: final Display defaultDisplay = Display.getDefault();
64: thread = new Thread(() -> {
65: try {
66: Thread.sleep(200);
67: } catch (final InterruptedException ex) {
68: /* silent */
69: }
70: final Set<Composite> toLayout = exchangeRequestedLayouts();
71:
72: defaultDisplay.asyncExec(() -> {
73: // BEGIN COMPLEX CODE
74: try {
75:• for (final Composite composite : toLayout) {
76:• if (composite.isDisposed()) {
77: continue;
78: }
79: composite.layout(true, true);
80: }
81: } catch (final Exception ex) {
82: getReportService().report(new AbstractReport(ex, "An exception occurred during re-layouting")); //$NON-NLS-1$
83: } finally {
84: // To avoid memory leaks we need to reset the thread in any case.
85: thread = null;
86: layoutDelayed();
87: }
88: // END COMPLEX CODE
89: });
90:
91: });
92: thread.start();
93: }
94:
95: private ReportService getReportService() {
96:• if (reportService == null) {
97: final Bundle bundle = FrameworkUtil.getBundle(EMFFormsSWTLayoutDelayed.class);
98:• if (bundle == null) {
99: return null;
100: }
101: final BundleContext bundleContext = bundle.getBundleContext();
102:• if (bundleContext == null) {
103: return null;
104: }
105: final ServiceReference<ReportService> serviceReference = bundleContext
106: .getServiceReference(ReportService.class);
107: reportService = bundleContext.getService(serviceReference);
108: }
109: return reportService;
110: }
111:
112: private synchronized Set<Composite> getRequestedLayouts() {
113: return requestedLayouts;
114: }
115:
116: private synchronized void setRequestedLayouts(Set<Composite> requestedLayouts) {
117: this.requestedLayouts = requestedLayouts;
118: }
119:
120: private synchronized Set<Composite> exchangeRequestedLayouts() {
121: final Set<Composite> toLayout = new LinkedHashSet<Composite>(getRequestedLayouts());
122: setRequestedLayouts(new LinkedHashSet<Composite>());
123: return toLayout;
124: }
125: }