blob: b59c02edb0f07457647abb2738d67e6ae58b6d97 (
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
|
/*******************************************************************************
* Copyright (c) 2011, 2012 Wind River Systems and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.tests.viewer.model;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IVirtualItemValidator;
import org.eclipse.debug.internal.ui.viewers.model.provisional.VirtualItem;
import org.eclipse.debug.internal.ui.viewers.model.provisional.VirtualTree;
/**
* Item validator for the virtual viewer which specifies that the given
* range of items should be treated as visible.
*/
public class VisibleVirtualItemValidator implements IVirtualItemValidator {
private int fStart = 0;
private int fEnd = 0;
public VisibleVirtualItemValidator(int startPosition, int length) {
setVisibleRange(startPosition, length);
}
public void setVisibleRange(int startPosition, int length) {
fStart = startPosition;
fEnd = startPosition + length;
}
public int getStartPosition() {
return fStart;
}
public int getLength() {
return fEnd - fStart;
}
@Override
public boolean isItemVisible(VirtualItem item) {
int position = 0;
while (item.getParent() != null) {
position += item.getIndex().intValue();
item = item.getParent();
}
return position >= fStart && position < fEnd || isSelected(item);
}
@Override
public void showItem(VirtualItem item) {
int length = fEnd - fStart;
fStart = calcPosition(item);
fEnd = fStart + length;
}
private int calcPosition(VirtualItem item) {
int position = 0;
while (item.getParent() != null) {
position += item.getIndex().intValue();
item = item.getParent();
}
return position;
}
private boolean isSelected(VirtualItem item) {
VirtualItem[] selection = getSelection(item);
for (int i = 0; i < selection.length; i++) {
VirtualItem selectionItem = selection[i];
while (selectionItem != null) {
if (item.equals(selectionItem)) {
return true;
}
selectionItem = selectionItem.getParent();
}
}
return false;
}
private VirtualItem[] getSelection(VirtualItem item) {
VirtualTree tree = getTree(item);
if (tree != null) {
return tree.getSelection();
}
return new VirtualItem[0];
}
private VirtualTree getTree(VirtualItem item) {
while (item != null && !(item instanceof VirtualTree)) {
item = item.getParent();
}
return (VirtualTree)item;
}
}
|
