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Package: MasterDetailSelectionProvider
MasterDetailSelectionProvider
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| MasterDetailSelectionProvider(ISelectionProvider) |
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| addPostSelectionChangedListener(ISelectionChangedListener) |
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| addSelectionChangedListener(ISelectionChangedListener) |
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| forward(ListenerList, ISelection) |
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| getActiveSelectionProvider() |
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| getSelection() |
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| hookListeners(ISelectionProvider) |
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| lambda$0(SelectionChangedEvent) |
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| lambda$1(SelectionChangedEvent) |
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| lambda$2(SelectionChangedEvent, ISelectionChangedListener) |
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| pumpSelection() |
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| removePostSelectionChangedListener(ISelectionChangedListener) |
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| removeSelectionChangedListener(ISelectionChangedListener) |
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| setDetailSelectionProvider(ISelectionProvider) |
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| setSelection(ISelection) |
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| unhookListeners(ISelectionProvider) |
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Coverage
1: /*******************************************************************************
2: * Copyright (c) 2019 Christian W. Damus 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: * Christian W. Damus - initial API and implementation
13: ******************************************************************************/
14: package org.eclipse.emf.ecp.view.spi.swt.selection;
15:
16: import org.eclipse.core.runtime.ListenerList;
17: import org.eclipse.jface.viewers.IPostSelectionProvider;
18: import org.eclipse.jface.viewers.ISelection;
19: import org.eclipse.jface.viewers.ISelectionChangedListener;
20: import org.eclipse.jface.viewers.ISelectionProvider;
21: import org.eclipse.jface.viewers.SelectionChangedEvent;
22:
23: /**
24: * Default implementation of a master-detail selection provider.
25: *
26: * @since 1.21
27: */
28: public class MasterDetailSelectionProvider implements IMasterDetailSelectionProvider, IPostSelectionProvider {
29: private final ListenerList<ISelectionChangedListener> listeners = new ListenerList<>();
30: private final ListenerList<ISelectionChangedListener> postListeners = new ListenerList<>();
31:
32: private final ISelectionChangedListener forwarder = event -> forward(listeners, event.getSelection());
33: private final ISelectionChangedListener postForwarder = event -> forward(postListeners, event.getSelection());
34:
35: private final ISelectionProvider master;
36: private ISelectionProvider detail;
37:
38: /**
39: * Initializes me with the {@code master} selection provider to which I delegate.
40: *
41: * @param master my master selection provider
42: */
43: public MasterDetailSelectionProvider(ISelectionProvider master) {
44: super();
45:
46: this.master = master;
47:
48: hookListeners(master);
49: }
50:
51: /**
52: * Get the currently active selection provider.
53: *
54: * @return the active selection provider
55: */
56: protected final ISelectionProvider getActiveSelectionProvider() {
57:• return detail != null ? detail : master;
58: }
59:
60: @Override
61: public ISelection getSelection() {
62: return getActiveSelectionProvider().getSelection();
63: }
64:
65: @Override
66: public void setSelection(ISelection selection) {
67: getActiveSelectionProvider().setSelection(selection);
68: }
69:
70: @Override
71: public void addSelectionChangedListener(ISelectionChangedListener listener) {
72: listeners.add(listener);
73: }
74:
75: @Override
76: public void removeSelectionChangedListener(ISelectionChangedListener listener) {
77: listeners.remove(listener);
78: }
79:
80: @Override
81: public void addPostSelectionChangedListener(ISelectionChangedListener listener) {
82: postListeners.add(listener);
83: }
84:
85: @Override
86: public void removePostSelectionChangedListener(ISelectionChangedListener listener) {
87: postListeners.remove(listener);
88: }
89:
90: @Override
91: public void setDetailSelectionProvider(ISelectionProvider selectionProvider) {
92:• if (selectionProvider != detail) {
93: unhookListeners(getActiveSelectionProvider());
94:
95: detail = selectionProvider;
96:
97: hookListeners(getActiveSelectionProvider());
98:
99: pumpSelection();
100: } // else nothing changed
101: }
102:
103: private void hookListeners(ISelectionProvider delegate) {
104: delegate.addSelectionChangedListener(forwarder);
105:• if (delegate instanceof IPostSelectionProvider) {
106: ((IPostSelectionProvider) delegate).addPostSelectionChangedListener(postForwarder);
107: }
108: }
109:
110: private void unhookListeners(ISelectionProvider delegate) {
111:• if (delegate instanceof IPostSelectionProvider) {
112: ((IPostSelectionProvider) delegate).removePostSelectionChangedListener(postForwarder);
113: }
114: delegate.removeSelectionChangedListener(forwarder);
115: }
116:
117: /**
118: * Distribute my current selection to listeners.
119: */
120: protected final void pumpSelection() {
121: final ISelection selection = getSelection();
122: forward(listeners, selection);
123: forward(postListeners, selection);
124: }
125:
126: private void forward(ListenerList<? extends ISelectionChangedListener> listeners, ISelection selection) {
127:• if (!listeners.isEmpty()) {
128: final SelectionChangedEvent forward = new SelectionChangedEvent(this, selection);
129: listeners.forEach(l -> l.selectionChanged(forward));
130: }
131: }
132:
133: }