SectionFieldPanel


1   package jimm.datavision.gui;
2   import jimm.datavision.ErrorHandler;
3   import jimm.datavision.gui.cmd.NewDraggedFieldCommand;
4   import java.awt.Color  ;
5   import java.awt.Component  ;
6   import java.awt.dnd.*;
7   import java.awt.datatransfer.*;
8   import javax.swing.JPanel  ;
9   
10  /**
11   * This is the panel that holds {@link FieldWidget}s within a {@link
12   * SectionWidget}. It can handle dragged fields.
13   *
14   * @author Jim Menard, <a HREF="mailto:jimm@io.com">jimm@io.com</a>
15   */
16  public class SectionFieldPanel extends JPanel   implements DropTargetListener {
17  
18  protected SectionWidget sectionWidget;
19  
20  /**
21   * Constructor.
22   *
23   * @param sw the section widget
24   */
25  public SectionFieldPanel(SectionWidget sw) {
26      super();
27      sectionWidget = sw;
28      new DropTarget(this,    // component
29             DnDConstants.ACTION_COPY_OR_MOVE, // actions
30             this);   // DropTargetListener
31  }
32  
33  /**
34   * Accepts fields dragged from the field picker window.
35   */
36  public void drop(DropTargetDropEvent e) {
37      try {
38      DataFlavor stringFlavor = DataFlavor.stringFlavor;
39      Transferable tr = e.getTransferable();
40      if (e.isDataFlavorSupported(stringFlavor)) {
41          addField(e, (String  )tr.getTransferData(stringFlavor));
42          e.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
43          e.dropComplete(true);
44      }
45      else {
46          e.rejectDrop();
47      }
48      }
49      catch(Exception   ex) {
50      ErrorHandler.error(ex);
51      }
52  }
53  
54  public void dragEnter(DropTargetDragEvent e) { }
55  public void dragExit(DropTargetEvent e) { }
56  public void dragOver(DropTargetDragEvent e) { }
57  public void dropActionChanged(DropTargetDragEvent e) { }
58  
59  /**
60   * Creates and adds a new field. The type and contents of the field are
61   * determined by the string that was dropped. If the field is a
62   * <code>ColumnField</code> and this is a detail section, add a text title
63   * field as well.
64   *
65   * @param e the drop event
66   * @param dropString the string received from the field picker window
67   */
68  protected void addField(DropTargetDropEvent e, String   dropString) {
69      sectionWidget.performCommand(new NewDraggedFieldCommand(sectionWidget,
70                                  dropString, e));
71  }
72  
73  /**
74   * Performs visual changes that reflect the "hidden" state of the section.
75   * Called by the command that edits the suppression proc of a section.
76   *
77   * @param isHidden new suppressed state
78   */
79  public void setHidden(boolean isHidden) {
80      Color   c = isHidden ? SectionWidget.SUPPRESSED_COLOR
81      : SectionWidget.NORMAL_COLOR;
82      setBackground(c);
83      Component  [] kids = getComponents();
84      for (int i = 0; i < kids.length; ++i)
85      kids[i].setBackground(c);
86  }
87  
88  }
89
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