JGridView (Part 2)
- by Geertjan
The second sample in the JGrid download is a picture viewer that needs to be seen to be believed. Here it is, integrated into a NetBeans Platform application (click to enlarge it):
When you mouse over the images, they change, showing several different images instantaneously.
Here's the explorer view above, mainly making use of code from the sample:
public class JGridView extends JScrollPane {
@Override
public void addNotify() {
super.addNotify();
final ExplorerManager em = ExplorerManager.find(this);
if (em != null) {
final JGrid grid = new JGrid();
Node root = em.getRootContext();
final Node[] nodes = root.getChildren().getNodes();
final PicViewerObject[] pics = new PicViewerObject[nodes.length];
for (int i = 0; i < nodes.length; i++) {
Node node = nodes[i];
pics[i] = node.getLookup().lookup(PicViewerObject.class);
}
grid.getCellRendererManager().setDefaultRenderer(new PicViewerRenderer());
grid.setModel(new DefaultListModel() {
@Override
public int getSize() {
return pics.length;
}
@Override
public Object getElementAt(int i) {
return pics[i];
}
});
grid.setFixedCellDimension(160);
grid.addMouseMotionListener(new MouseAdapter() {
int lastIndex = -1;
@Override
public void mouseMoved(MouseEvent e) {
if (lastIndex >= 0) {
Object o = grid.getModel().getElementAt(lastIndex);
if (o instanceof PicViewerObject) {
Rectangle r = grid.getCellBounds(lastIndex);
if (r != null && !r.contains(e.getPoint())) {
((PicViewerObject) o).setMarker(false);
grid.repaint(r);
}
}
}
int index = grid.getCellAt(e.getPoint());
if (index >= 0) {
Object o = grid.getModel().getElementAt(index);
if (o instanceof PicViewerObject) {
Rectangle r = grid.getCellBounds(index);
if (r != null) {
((PicViewerObject) o).setFraction(((float) e.getPoint().x - (float) r.x)
/ (float) r.width);
((PicViewerObject) o).setMarker(true);
lastIndex = index;
grid.repaint(r);
}
}
}
}
});
grid.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
@Override
public void valueChanged(ListSelectionEvent e) {
//Somehow compare the selected item
//with the list of books and find a matching book:
int selectedIndex = grid.getSelectedIndex();
for (int i = 0; i < nodes.length; i++) {
int picId = pics[i].getId();
if (selectedIndex == picId) {
try {
em.setSelectedNodes(new Node[]{nodes[i]});
} catch (PropertyVetoException ex) {
Exceptions.printStackTrace(ex);
}
}
}
}
});
setViewportView(grid);
}
}
}
The next step is to create a generic JGridView that will handle any kind of object automatically.
