|
1
|
/*******************************************************************************
|
|
2
|
* Copyright (c) 2000, 2010 IBM Corporation and others.
|
|
3
|
* All rights reserved. This program and the accompanying materials
|
|
4
|
* are made available under the terms of the Eclipse Public License v1.0
|
|
5
|
* which accompanies this distribution, and is available at
|
|
6
|
* http://www.eclipse.org/legal/epl-v10.html
|
|
7
|
*
|
|
8
|
* Contributors:
|
|
9
|
* IBM Corporation - initial API and implementation
|
|
10
|
*******************************************************************************/
|
|
11
|
package org.eclipse.gef.dnd;
|
|
12
|
|
|
13
|
import org.eclipse.swt.dnd.DND;
|
|
14
|
|
|
15
|
import org.eclipse.gef.EditPart;
|
|
16
|
import org.eclipse.gef.EditPartViewer;
|
|
17
|
import org.eclipse.gef.Request;
|
|
18
|
import org.eclipse.gef.requests.CreateRequest;
|
|
19
|
import org.eclipse.gef.requests.CreationFactory;
|
|
20
|
import org.eclipse.gef.requests.SimpleFactory;
|
|
21
|
|
|
22
|
/**
|
|
23
|
* Performs a native Drop using the {@link TemplateTransfer}. The Drop is
|
|
24
|
* performed by using a {@link CreateRequest} to obtain a <code>Command</code>
|
|
25
|
* from the targeted <code>EditPart</code>.
|
|
26
|
* <P>
|
|
27
|
* This class is <code>abstract</code>. Subclasses are responsible for providing
|
|
28
|
* the appropriate <code>Factory</code> object based on the template that is
|
|
29
|
* being dragged.
|
|
30
|
*
|
|
31
|
* @since 2.1
|
|
32
|
* @author Eric Bordeau
|
|
33
|
*/
|
|
34
|
public class TemplateTransferDropTargetListener extends
|
|
35
|
AbstractTransferDropTargetListener {
|
|
36
|
|
|
37
|
/**
|
|
38
|
* Constructs a listener on the specified viewer.
|
|
39
|
*
|
|
40
|
* @param viewer
|
|
41
|
* the EditPartViewer
|
|
42
|
*/
|
|
43
|
public TemplateTransferDropTargetListener(EditPartViewer viewer) {
|
|
44
|
super(viewer, TemplateTransfer.getInstance());
|
|
45
|
}
|
|
46
|
|
|
47
|
/**
|
|
48
|
* @see org.eclipse.gef.dnd.AbstractTransferDropTargetListener#createTargetRequest()
|
|
49
|
*/
|
|
50
|
protected Request createTargetRequest() {
|
|
51
|
// Look at the data on templatetransfer.
|
|
52
|
// Create factory
|
|
53
|
CreateRequest request = new CreateRequest();
|
|
54
|
request.setFactory(getFactory(TemplateTransfer.getInstance()
|
|
55
|
.getTemplate()));
|
|
56
|
return request;
|
|
57
|
}
|
|
58
|
|
|
59
|
/**
|
|
60
|
* A helper method that casts the target Request to a CreateRequest.
|
|
61
|
*
|
|
62
|
* @return CreateRequest
|
|
63
|
*/
|
|
64
|
protected final CreateRequest getCreateRequest() {
|
|
65
|
return ((CreateRequest) getTargetRequest());
|
|
66
|
}
|
|
67
|
|
|
68
|
/**
|
|
69
|
* Returns the appropriate Factory object to be used for the specified
|
|
70
|
* template. This Factory is used on the CreateRequest that is sent to the
|
|
71
|
* target EditPart.
|
|
72
|
*
|
|
73
|
* @param template
|
|
74
|
* the template Object
|
|
75
|
* @return a Factory
|
|
76
|
*/
|
|
77
|
protected CreationFactory getFactory(Object template) {
|
|
78
|
if (template instanceof CreationFactory) {
|
|
79
|
return ((CreationFactory) template);
|
|
80
|
} else if (template instanceof Class) {
|
|
81
|
return new SimpleFactory((Class) template);
|
|
82
|
} else
|
|
83
|
return null;
|
|
84
|
}
|
|
85
|
|
|
86
|
/**
|
|
87
|
* The purpose of a template is to be copied. Therefore, the drop operation
|
|
88
|
* can't be anything but <code>DND.DROP_COPY</code>.
|
|
89
|
*
|
|
90
|
* @see AbstractTransferDropTargetListener#handleDragOperationChanged()
|
|
91
|
*/
|
|
92
|
protected void handleDragOperationChanged() {
|
|
93
|
getCurrentEvent().detail = DND.DROP_COPY;
|
|
94
|
super.handleDragOperationChanged();
|
|
95
|
}
|
|
96
|
|
|
97
|
/**
|
|
98
|
* The purpose of a template is to be copied. Therefore, the Drop operation
|
|
99
|
* is set to <code>DND.DROP_COPY</code> by default.
|
|
100
|
*
|
|
101
|
* @see org.eclipse.gef.dnd.AbstractTransferDropTargetListener#handleDragOver()
|
|
102
|
*/
|
|
103
|
protected void handleDragOver() {
|
|
104
|
getCurrentEvent().detail = DND.DROP_COPY;
|
|
105
|
getCurrentEvent().feedback = DND.FEEDBACK_SCROLL | DND.FEEDBACK_EXPAND;
|
|
106
|
super.handleDragOver();
|
|
107
|
}
|
|
108
|
|
|
109
|
/**
|
|
110
|
* Overridden to select the created object.
|
|
111
|
*
|
|
112
|
* @see org.eclipse.gef.dnd.AbstractTransferDropTargetListener#handleDrop()
|
|
113
|
*/
|
|
114
|
protected void handleDrop() {
|
|
115
|
super.handleDrop();
|
|
116
|
selectAddedObject();
|
|
117
|
}
|
|
118
|
|
|
119
|
private void selectAddedObject() {
|
|
120
|
Object model = getCreateRequest().getNewObject();
|
|
121
|
if (model == null)
|
|
122
|
return;
|
|
123
|
EditPartViewer viewer = getViewer();
|
|
124
|
viewer.getControl().forceFocus();
|
|
125
|
Object editpart = viewer.getEditPartRegistry().get(model);
|
|
126
|
if (editpart instanceof EditPart) {
|
|
127
|
// Force a layout first.
|
|
128
|
getViewer().flush();
|
|
129
|
viewer.select((EditPart) editpart);
|
|
130
|
}
|
|
131
|
}
|
|
132
|
|
|
133
|
/**
|
|
134
|
* Assumes that the target request is a {@link CreateRequest}.
|
|
135
|
*/
|
|
136
|
protected void updateTargetRequest() {
|
|
137
|
CreateRequest request = getCreateRequest();
|
|
138
|
request.setLocation(getDropLocation());
|
|
139
|
}
|
|
140
|
|
|
141
|
}
|