blob: 2fc7d439c2846c5ed9e2f34751a60bf974793950 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/*******************************************************************************
* Copyright (c) 2004, 2007 Mylyn project committers and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.ui.views;
import java.util.LinkedHashSet;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.jface.viewers.TreeSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.mylyn.commons.core.StatusHandler;
import org.eclipse.mylyn.internal.tasks.ui.TasksUiPlugin;
import org.eclipse.mylyn.internal.tasks.ui.util.TreeWalker;
import org.eclipse.mylyn.internal.tasks.ui.util.TreeWalker.TreeVisitor;
import org.eclipse.mylyn.tasks.core.AbstractTask;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.widgets.TreeItem;
import org.eclipse.ui.progress.WorkbenchJob;
/**
* @author Steffen Pingel
*/
abstract class DelayedRefreshJob extends WorkbenchJob {
static final long REFRESH_DELAY_DEFAULT = 200;
static final long REFRESH_DELAY_MAX = 500;
private final TreeViewer treeViewer;
private static final int NOT_SCHEDULED = -1;
private final LinkedHashSet<Object> queue = new LinkedHashSet<Object>();
private long scheduleTime = NOT_SCHEDULED;
public DelayedRefreshJob(TreeViewer treeViewer, String name) {
super(name);
this.treeViewer = treeViewer;
setSystem(true);
}
public void forceRefresh() {
queue.add(null);
runInUIThread(new NullProgressMonitor());
}
public synchronized void refresh() {
refreshTask(null);
}
public synchronized void refreshTask(Object element) {
queue.add(element);
if (scheduleTime == NOT_SCHEDULED) {
scheduleTime = System.currentTimeMillis();
schedule(REFRESH_DELAY_DEFAULT);
} else if (System.currentTimeMillis() - scheduleTime < REFRESH_DELAY_MAX - REFRESH_DELAY_DEFAULT) {
// reschedule to aggregate more refreshes
cancel();
schedule(REFRESH_DELAY_DEFAULT);
}
}
@Override
public IStatus runInUIThread(IProgressMonitor monitor) {
if (treeViewer.getControl() == null || treeViewer.getControl().isDisposed()) {
return Status.CANCEL_STATUS;
}
final Object[] items;
synchronized (this) {
if (queue.contains(null)) {
items = null;
} else {
items = queue.toArray(new Object[0]);
}
queue.clear();
scheduleTime = NOT_SCHEDULED;
}
// in case the refresh removes the currently selected item,
// remember the next item in the tree to restore the selection
TreeItem[] selection = treeViewer.getTree().getSelection();
TreePath treePath = null;
if (selection.length > 0) {
TreeWalker treeWalker = new TreeWalker(treeViewer);
treePath = treeWalker.walk(new TreeVisitor() {
@Override
public boolean visit(Object object) {
return true;
}
}, selection[selection.length - 1]);
}
refresh(items);
if (treePath != null) {
ISelection newSelection = treeViewer.getSelection();
if (newSelection == null || newSelection.isEmpty()) {
treeViewer.setSelection(new TreeSelection(treePath), true);
}
}
return Status.OK_STATUS;
}
protected void refresh(final Object[] items) {
if (items == null) {
treeViewer.refresh(true);
} else if (items.length > 0) {
try {
for (Object item : items) {
if (item instanceof AbstractTask) {
AbstractTask task = (AbstractTask) item;
treeViewer.refresh(task, true);
} else {
treeViewer.refresh(item, true);
}
updateExpansionState(item);
}
} catch (SWTException e) {
StatusHandler.log(new Status(IStatus.ERROR, TasksUiPlugin.ID_PLUGIN, "Failed to refresh viewer: "
+ treeViewer, e));
}
}
}
protected abstract void updateExpansionState(Object item);
}
|
