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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Eclipse Public License, Version 1.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.eclipse.org/org/documents/epl-v10.php
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.ide.eclipse.adt.internal.editors.layout.gle2;
import com.android.ide.common.api.INode;
import com.android.ide.common.api.InsertType;
import com.android.ide.common.layout.BaseLayoutRule;
import com.android.ide.eclipse.adt.internal.editors.descriptors.DescriptorsUtils;
import com.android.ide.eclipse.adt.internal.editors.layout.gre.NodeProxy;
import com.android.ide.eclipse.adt.internal.editors.layout.uimodel.UiViewElementNode;
import com.android.ide.eclipse.adt.internal.editors.uimodel.UiElementNode;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.ViewerDropAdapter;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.TransferData;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/** Drop listener for the outline page */
/*package*/ class OutlineDropListener extends ViewerDropAdapter {
private final OutlinePage mOutlinePage;
public OutlineDropListener(OutlinePage outlinePage, TreeViewer treeViewer) {
super(treeViewer);
mOutlinePage = outlinePage;
}
@Override
public void dragEnter(DropTargetEvent event) {
if (event.detail == DND.DROP_NONE && GlobalCanvasDragInfo.getInstance().isDragging()) {
// For some inexplicable reason, we get DND.DROP_NONE from the palette
// even though in its drag start we set DND.DROP_COPY, so correct that here...
int operation = DND.DROP_COPY;
event.detail = operation;
}
super.dragEnter(event);
}
@Override
public boolean performDrop(Object data) {
final DropTargetEvent event = getCurrentEvent();
if (event == null) {
return false;
}
int location = determineLocation(event);
if (location == LOCATION_NONE) {
return false;
}
final SimpleElement[] elements;
SimpleXmlTransfer sxt = SimpleXmlTransfer.getInstance();
if (sxt.isSupportedType(event.currentDataType)) {
if (data instanceof SimpleElement[]) {
elements = (SimpleElement[]) data;
} else {
return false;
}
} else {
return false;
}
if (elements.length == 0) {
return false;
}
// Determine target:
CanvasViewInfo parent = OutlinePage.getViewInfo(event.item.getData());
if (parent == null) {
return false;
}
int index = -1;
UiViewElementNode parentNode = parent.getUiViewNode();
if (location == LOCATION_BEFORE || location == LOCATION_AFTER) {
UiViewElementNode node = parentNode;
parent = parent.getParent();
if (parent == null) {
return false;
}
parentNode = parent.getUiViewNode();
// Determine index
index = 0;
for (UiElementNode child : parentNode.getUiChildren()) {
if (child == node) {
break;
}
index++;
}
if (location == LOCATION_AFTER) {
index++;
}
}
// Copy into new position.
final LayoutCanvas canvas = mOutlinePage.getEditor().getCanvasControl();
final NodeProxy targetNode = canvas.getNodeFactory().create(parentNode);
// Record children of the target right before the drop (such that we can
// find out after the drop which exact children were inserted)
Set<INode> children = new HashSet<INode>();
for (INode node : targetNode.getChildren()) {
children.add(node);
}
String label = MoveGesture.computeUndoLabel(targetNode, elements, event.detail);
final int indexFinal = index;
canvas.getEditorDelegate().getEditor().wrapUndoEditXmlModel(label, new Runnable() {
@Override
public void run() {
InsertType insertType = MoveGesture.getInsertType(event, targetNode);
canvas.getRulesEngine().setInsertType(insertType);
Object sourceCanvas = GlobalCanvasDragInfo.getInstance().getSourceCanvas();
boolean createNew = event.detail == DND.DROP_COPY || sourceCanvas != canvas;
BaseLayoutRule.insertAt(targetNode, elements, createNew, indexFinal);
targetNode.applyPendingChanges();
// Clean up drag if applicable
if (event.detail == DND.DROP_MOVE) {
GlobalCanvasDragInfo.getInstance().removeSource();
}
}
});
// Now find out which nodes were added, and look up their corresponding
// CanvasViewInfos
final List<INode> added = new ArrayList<INode>();
for (INode node : targetNode.getChildren()) {
if (!children.contains(node)) {
added.add(node);
}
}
// Select the newly dropped nodes
final SelectionManager selectionManager = canvas.getSelectionManager();
selectionManager.setOutlineSelection(added);
canvas.redraw();
return true;
}
@Override
public boolean validateDrop(Object target, int operation,
TransferData transferType) {
DropTargetEvent event = getCurrentEvent();
if (event == null) {
return false;
}
int location = determineLocation(event);
if (location == LOCATION_NONE) {
return false;
}
SimpleXmlTransfer sxt = SimpleXmlTransfer.getInstance();
if (!sxt.isSupportedType(transferType)) {
return false;
}
CanvasViewInfo parent = OutlinePage.getViewInfo(event.item.getData());
if (parent == null) {
return false;
}
UiViewElementNode parentNode = parent.getUiViewNode();
if (location == LOCATION_ON) {
// Targeting the middle of an item means to add it as a new child
// of the given element. This is only allowed on some types of nodes.
if (!DescriptorsUtils.canInsertChildren(parentNode.getDescriptor(),
parent.getViewObject())) {
return false;
}
}
// Check that the drop target position is not a child or identical to
// one of the dragged items
SelectionItem[] sel = GlobalCanvasDragInfo.getInstance().getCurrentSelection();
if (sel != null) {
for (SelectionItem item : sel) {
if (isAncestor(item.getViewInfo().getUiViewNode(), parentNode)) {
return false;
}
}
}
return true;
}
/** Returns true if the given parent node is an ancestor of the given child node */
private boolean isAncestor(UiElementNode parent, UiElementNode child) {
while (child != null) {
if (child == parent) {
return true;
}
child = child.getUiParent();
}
return false;
}
}
|
