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Java > Open Source Codes > jimm > datavision > gui > DropListenerTextArea


1 package jimm.datavision.gui;
2 import jimm.datavision.*;
3 import jimm.datavision.field.SpecialField;
4 import jimm.datavision.source.Column;
5 import java.awt.dnd.*;
6 import java.awt.datatransfer.*;
7 import javax.swing.JTextArea JavaDoc;
8
9 /**
10  * A text area that accepts drags containing report fields. Used by
11  * {@link CodeEditorWin}s.
12  *
13  * @author Jim Menard, <a HREF="mailto:jimm@io.com">jimm@io.com</a>
14  */
15 public class DropListenerTextArea
16     extends JTextArea JavaDoc
17     implements DropTargetListener
18 {
19
20 protected Report report;
21
22 public DropListenerTextArea(Report report, String JavaDoc text) {
23     super(text);
24     this.report = report;
25     new DropTarget(this, // component
26 DnDConstants.ACTION_COPY_OR_MOVE, // actions
27 this); // DropTargetListener
28 }
29
30 public void drop(DropTargetDropEvent e) {
31     try {
32     DataFlavor stringFlavor = DataFlavor.stringFlavor;
33     Transferable tr = e.getTransferable();
34     if (e.isDataFlavorSupported(stringFlavor)) {
35         String JavaDoc str = (String JavaDoc)tr.getTransferData(stringFlavor);
36         if (str.startsWith("column:")) {
37         Column col = report.findColumn(str.substring(7));
38         replaceSelection("{" + col.fullName() + "}");
39         }
40         else if (str.startsWith("parameter:")) {
41         Parameter param = report.findParameter(str.substring(10));
42         replaceSelection(param.designLabel());
43         }
44         else if (str.startsWith("formula:")) {
45         Formula formula = report.findFormula(str.substring(8));
46         replaceSelection(formula.designLabel());
47         }
48         else if (str.startsWith("usercol:")) {
49         UserColumn uc = report.findUserColumn(str.substring(8));
50         replaceSelection(uc.designLabel());
51         }
52         else if (str.startsWith("special:")) {
53         SpecialField sf = new SpecialField(null, report, null,
54                            str.substring(8), false);
55         replaceSelection(sf.formulaString());
56         }
57         else
58         replaceSelection(str);
59
60         e.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
61         e.dropComplete(true);
62     }
63     else
64         e.rejectDrop();
65     }
66     catch(Exception JavaDoc ex) {
67     ErrorHandler.error(ex);
68     }
69 }
70
71 public void dragEnter(DropTargetDragEvent e) { }
72 public void dragExit(DropTargetEvent e) { }
73 public void dragOver(DropTargetDragEvent e) { }
74 public void dropActionChanged(DropTargetDragEvent e) { }
75 }
76
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