The document discusses integrating persistence with SQLite and ORM binding in three main ways: 1. It loads dish objects from app storage if the dishes list is empty. 2. It uses a delete listener to refresh the UI after a deletion by removing any component representing a deleted dish. 3. It binds dish properties to the UI so that if properties change when data is persisted, those changes are reflected in the main dish list.

1. SQLite & ORM Binding - Part II

2. Integrating Persistence
✦If there are no dishes we load them from the app
storage in the dishes list
© Codename One 2017 all rights reserved
if(Restaurant.getInstance().menu.get().dishes.size() == 0) {
for(PropertyBusinessObject d : AppStorage.getInstance().fetchDishes()) {
Restaurant.getInstance().menu.get().dishes.add((Dish)d);
}
}
for(Dish d : Restaurant.getInstance().menu.get().dishes) {
addDish(app, d);
}

3. Integrating Persistence
✦We use the delete listener to refresh the UI after
deletion
© Codename One 2017 all rights reserved
AppStorage.getInstance().addDeleteListener(e -> {
for(Component cmp : getContentPane()) {
Dish d = (Dish)cmp.getClientProperty("dish");
if(d == e.getSource()) {
cmp.remove();
revalidate();
return;
}
}
});

4. Property Binding
✦If the properties change (when data is persisted) we
map that to the UI of the dish in the main dish list
© Codename One 2017 all rights reserved
public void addDish(AppSettings app, Dish d) {
ScaleImageButton sb = new ScaleImageButton(d.getFullSize());
sb.setBackgroundType(Style.BACKGROUND_IMAGE_SCALED_FILL);
Label title = new Label(d.name.get(), "DishName");
d.name.addChangeListener(pl -> title.setText(d.name.get()));
Label description = new Label(d.description.get(), "DishDescription");
d.description.addChangeListener(pl -> description.setText(d.description.get()));

5. delete.addActionListener(e -> {
previous.addShowListener(prev -> {
previous.removeAllShowListeners();
ToastBar.showMessage("Deleted " + d.name.get() + ". Undo?”,
FontImage.MATERIAL_UNDO, ee -> {
DishListForm dlf = (DishListForm)previous;
dlf.addDish(app, d);
d.id.set(null);
bld.addDish(app, d);
d.id.addChangeListener(pl -> AppStorage.getInstance().insert(d));
});
});
previous.showBack();
bld.deleteDish(app, d);
AppStorage.getInstance().delete(d);
});
DishEditForm

6. delete.addActionListener(e -> {
previous.addShowListener(prev -> {
previous.removeAllShowListeners();
ToastBar.showMessage("Deleted " + d.name.get() + ". Undo?”,
FontImage.MATERIAL_UNDO, ee -> {
DishListForm dlf = (DishListForm)previous;
dlf.addDish(app, d);
d.id.set(null);
bld.addDish(app, d);
d.id.addChangeListener(pl -> AppStorage.getInstance().insert(d));
});
});
previous.showBack();
bld.deleteDish(app, d);
AppStorage.getInstance().delete(d);
});
DishEditForm

7. delete.addActionListener(e -> {
previous.addShowListener(prev -> {
previous.removeAllShowListeners();
ToastBar.showMessage("Deleted " + d.name.get() + ". Undo?”,
FontImage.MATERIAL_UNDO, ee -> {
DishListForm dlf = (DishListForm)previous;
dlf.addDish(app, d);
d.id.set(null);
bld.addDish(app, d);
d.id.addChangeListener(pl -> AppStorage.getInstance().insert(d));
});
});
previous.showBack();
bld.deleteDish(app, d);
AppStorage.getInstance().delete(d);
});
DishEditForm

8. delete.addActionListener(e -> {
previous.addShowListener(prev -> {
previous.removeAllShowListeners();
ToastBar.showMessage("Deleted " + d.name.get() + ". Undo?”,
FontImage.MATERIAL_UNDO, ee -> {
DishListForm dlf = (DishListForm)previous;
dlf.addDish(app, d);
d.id.set(null);
bld.addDish(app, d);
d.id.addChangeListener(pl -> AppStorage.getInstance().insert(d));
});
});
previous.showBack();
bld.deleteDish(app, d);
AppStorage.getInstance().delete(d);
});
DishEditForm

9. delete.addActionListener(e -> {
previous.addShowListener(prev -> {
previous.removeAllShowListeners();
ToastBar.showMessage("Deleted " + d.name.get() + ". Undo?”,
FontImage.MATERIAL_UNDO, ee -> {
DishListForm dlf = (DishListForm)previous;
dlf.addDish(app, d);
d.id.set(null);
bld.addDish(app, d);
d.id.addChangeListener(pl -> AppStorage.getInstance().insert(d));
});
});
previous.showBack();
bld.deleteDish(app, d);
AppStorage.getInstance().delete(d);
});
DishEditForm

10. ok.addActionListener(e -> {
previous.showBack();
d.name.set(title.getText());
d.description.set(description.getText());
try {
d.price.set(Double.parseDouble(price.getText()));
} catch(NumberFormatException err) {
Log.e(err);
ToastBar.showErrorMessage("Malformed price");
}
bld.updateDish(app, d);
Restaurant.getInstance().menu.get().dishes.add(d);
if(d.id.get() != null) {
AppStorage.getInstance().update(d);
}
//bld.updateDishImage(app, d);
});
DishEditForm

11. TextField title = new TextField(app.name.get());
title.setUIID("NavigationTitle");
title.addActionListener(a -> {
app.name.set(title.getText());
AppStorage.getInstance().update(app);
});
TextField tagline = new TextField(app.tagline.get());
tagline.setUIID("Tagline");
tagline.addActionListener(a -> {
app.tagline.set(tagline.getText());
AppStorage.getInstance().update(app);
});
BaseNavigationForm

12. Thank You