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1
11 package org.eclipse.pde.internal.ui.editor.schema;
12
13 import java.util.ArrayList  ;
14 import java.util.Iterator ;
15
16 import org.eclipse.jface.viewers.ISelectionProvider;
17 import org.eclipse.jface.viewers.IStructuredSelection;
18 import org.eclipse.pde.internal.core.ischema.ISchemaObject;
19 import org.eclipse.pde.internal.ui.editor.ModelDataTransfer;
20 import org.eclipse.swt.dnd.DragSource;
21 import org.eclipse.swt.dnd.DragSourceAdapter;
22 import org.eclipse.swt.dnd.DragSourceEvent;
23 import org.eclipse.swt.dnd.TextTransfer;
24 import org.eclipse.swt.widgets.Control;
25
26 public class ElementSectionDragAdapter extends DragSourceAdapter {
27 private ISelectionProvider fSelectionProvider;
28 private Object fDragData;
29
30
33 public ElementSectionDragAdapter(ISelectionProvider provider) {
34 fSelectionProvider = provider;
35
36 }
37
38
42 public void dragSetData(DragSourceEvent event) {
43 if (event.doit == false)
44 return;
45 if (ModelDataTransfer.getInstance().isSupportedType(event.dataType)) {
46 event.data = getSelectedModelObjects();
47 fDragData = event.data;
48 return;
49 }
50 if (TextTransfer.getInstance().isSupportedType(event.dataType)) {
51 event.data =
52 createTextualRepresentation(
53 (IStructuredSelection) fSelectionProvider.getSelection());
54 fDragData = null;
55 return;
56 }
57 }
58
59 private String createTextualRepresentation(IStructuredSelection sel) {
60 StringBuffer buf = new StringBuffer ();
61 for (Iterator iter = sel.iterator(); iter.hasNext();) {
62 String name = iter.next().toString();
63 buf.append(name);
64 buf.append(" "); }
66 return buf.toString();
67 }
68
71 public void dragStart(DragSourceEvent event) {
72
73 DragSource dragSource = (DragSource) event.widget;
75 Control control = dragSource.getControl();
76 if (control != control.getDisplay().getFocusControl()) {
77 event.doit = false;
78 return;
79 }
80
81 event.doit = canDrag();
82 }
83
84 public void dragFinished(DragSourceEvent event) {
85 if (event.doit == false || fDragData == null)
86 return;
87 fDragData = null;
88 }
89
90 private boolean canDrag() {
91 return canCopy((IStructuredSelection) fSelectionProvider.getSelection());
92 }
93
94 private boolean canCopy(IStructuredSelection selection) {
95 Object prev = null;
96 for (Iterator iter = selection.iterator(); iter.hasNext();) {
97 Object obj = iter.next();
98 if (!(obj instanceof ISchemaObject))
99 return false;
100 if (prev != null) {
101 if (prev.getClass().equals(obj.getClass()) == false)
102 return false;
103 } else
104 prev = obj;
105 }
106 return true;
107 }
108
109 private ISchemaObject[] getSelectedModelObjects() {
110 return createObjectRepresentation(
111 (IStructuredSelection) fSelectionProvider.getSelection());
112 }
113
114 private ISchemaObject[] createObjectRepresentation(IStructuredSelection selection) {
115 ArrayList objects = new ArrayList ();
116 for (Iterator iter = selection.iterator(); iter.hasNext();) {
117 Object obj = iter.next();
118 if (obj instanceof ISchemaObject)
119 objects.add(obj);
120 else
121 return new ISchemaObject[0];
122 }
123 return (ISchemaObject[]) objects.toArray(
124 new ISchemaObject[objects.size()]);
125 }
126
127 public Object [] getDragData() {
128 if (fDragData instanceof Object [])
129 return (Object [])fDragData;
130 return new Object [] { fDragData };
131 }
132 }
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