Skip to main content
aboutsummaryrefslogtreecommitdiffstats
blob: a2336fb93b8d4e792f517a404ae33097848ac1d8 (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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
/*******************************************************************************
 * Copyright (c) 2006, 2011 Brad Reynolds.
 * 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
 *
 * Contributors:
 *    Brad Reynolds - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.tests.viewers;

import java.util.ArrayList;
import java.util.List;

import junit.framework.TestCase;

import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.ListViewer;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

public class ListViewerRefreshTest extends TestCase {
	/**
	 * Used for viewing the UI. Set to 0 if not wanting to see the UI.
	 */
	private static final int DELAY = 0;

	private Shell shell = null;

	private Label label = null;

	private ListViewer<String,List<String>> viewer = null;

	private ArrayList<String> input = null;

	protected void setUp() throws Exception {
		shell = new Shell();
		shell.setSize(400, 200);
		shell.setLayout(new FillLayout());
		label = new Label(shell, SWT.WRAP);
		viewer = new ListViewer<String,List<String>>(shell);
		input = new ArrayList<String>();

		for (int i = 0; i < 50; i++) {
			input.add("item " + i); //$NON-NLS-1$
		}

		viewer.setContentProvider(new ContentProvider());
		viewer.setInput(input);
		shell.layout();
		shell.open();
	}

	protected void tearDown() throws Exception {
		shell.dispose();
		shell = null;
	}

	/**
	 * Asserts the ability to refresh without a selection and preserve the
	 * scrolled to position.
	 *
	 * @throws Exception
	 */
	public void testNoSelectionRefresh() throws Exception {
		shell.setText("Lost Scrolled Position Test"); //$NON-NLS-1$
		readAndDispatch();

		run("Scrolled to position 30.", new Runnable() { //$NON-NLS-1$
					public void run() {
						viewer.reveal(input.get(30));
					}
				});

		run("Refreshed viewer without a selection.", new Runnable() { //$NON-NLS-1$
					public void run() {
						viewer.refresh();
					}
				});

		// BUG: The top index should not be the first item.
		assertTrue(viewer.getList().getTopIndex() != 0);
	}

	/**
	 * Asserts the ability to refresh with a selection and preserve the scrolled
	 * to position.
	 *
	 * @throws Exception
	 */
	public void testSelectionRefresh() throws Exception {
		shell.setText("Preserved Scrolled Position Test"); //$NON-NLS-1$
		readAndDispatch();

		run("Setting selection to index 30.", new Runnable() { //$NON-NLS-1$
					public void run() {
						viewer.setSelection(new StructuredSelection(input
								.get(30)));
					}
				});

		// Ensure that to index is 0
		viewer.getList().setTopIndex(0);

		run("Refreshed viewer with selection.", new Runnable() { //$NON-NLS-1$
					public void run() {
						viewer.refresh();
					}
				});

		// Checking that the viewer is not scrolling
		assertTrue(viewer.getList().getTopIndex() == 0);

		viewer.getList().showSelection();

		assertTrue(viewer.getList().getTopIndex() != 0);
	}

	/**
	 * Runs the runnable and displays the description.
	 *
	 * @param description
	 * @param runnable
	 */
	private void run(String description, Runnable runnable) {
		runnable.run();
		label.setText(description);

		readAndDispatch();
	}

	/**
	 * Flush UI events and {@link #DELAY delays}.
	 */
	private void readAndDispatch() {
		Display display = Display.getCurrent();
		while(display.readAndDispatch());

		try {
			Thread.sleep(DELAY);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}

	private class ContentProvider implements IStructuredContentProvider<String,List<String>> {

		public String[] getElements(List<String> inputElement) {
			String[] results = new String[inputElement.size()];
			return inputElement.toArray(results);
		}

		public void dispose() {
		}

		public void inputChanged(Viewer<? extends List<String>> viewer, List<String> oldInput, List<String> newInput) {
		}
	}
}

Back to the top