blob: 90ed8e2ea80c24e554e994934d3786922532bccd (
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
|
/*******************************************************************************
* Copyright (c) 2000, 2007 IBM Corporation 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
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.compare;
import org.eclipse.compare.internal.Utilities;
import org.eclipse.core.runtime.IAdaptable;
/**
* Supports cross-pane navigation through the differences of a compare container.
* <p>
* Clients may subclass this class.
* </p>
* @see INavigatable
* @since 3.3
*/
public abstract class CompareNavigator implements ICompareNavigator {
/* (non-Javadoc)
* @see org.eclipse.compare.ICompareNavigator#selectChange(boolean)
*/
public boolean selectChange(boolean next) {
// find most down stream CompareViewerPane
INavigatable[] navigators= getNavigatables();
Object downStreamInput = null;
for (int i = navigators.length - 1; i >=0; i--) {
INavigatable navigatable = navigators[i];
if (navigatable.getInput() == downStreamInput) {
// Skip to up stream pane if it has the same input
continue;
}
if (navigatable.selectChange(next ? INavigatable.NEXT_CHANGE : INavigatable.PREVIOUS_CHANGE)) {
// at end of this navigator
downStreamInput = navigatable.getInput();
continue;
}
// not at end
if (i + 1 < navigators.length && navigators[i+1] != null && navigators[i+1].getInput() != downStreamInput) {
// The navigation has invoked a change in a downstream pane.
// Set the selected change depending on the direction we are navigating
navigators[i+1].selectChange(next ? INavigatable.FIRST_CHANGE : INavigatable.LAST_CHANGE);
}
return false;
}
return true;
}
protected abstract INavigatable[] getNavigatables();
/**
* Return the {@link INavigatable} for the given object.
* If the object implements {@link INavigatable}, then
* the object is returned. Otherwise, if the object
* implements {@link IAdaptable}, the object is
* adapted to {@link INavigatable}.
* @param object the object
* @return the {@link INavigatable} for the given object or <code>null</code>
*/
protected final INavigatable getNavigator(Object object) {
if (object == null)
return null;
Object data= Utilities.getAdapter(object, INavigatable.class);
if (data instanceof INavigatable)
return (INavigatable) data;
return null;
}
/**
* Return whether a call to {@link ICompareNavigator#selectChange(boolean)} with the same parameter
* would succeed.
* @param next if <code>true</code> the next change is selected, otherwise the previous change
* @return whether a call to {@link ICompareNavigator#selectChange(boolean)} with the same parameter
* would succeed.
* @since 3.3
*/
public boolean hasChange(boolean next) {
INavigatable[] navigators= getNavigatables();
Object downStreamInput = null;
for (int i = navigators.length - 1; i >=0; i--) {
INavigatable navigatable = navigators[i];
if (navigatable.getInput() == downStreamInput) {
// Skip to up stream pane if it has the same input
continue;
}
if (navigatable.hasChange(next ? INavigatable.NEXT_CHANGE : INavigatable.PREVIOUS_CHANGE)) {
return true;
}
// at end of this navigator
downStreamInput = navigatable.getInput();
}
return false;
}
}
|
