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Listing 5 17. Drawing the map and its markers void MapItemWidget::paintEvent(QPaintEvent *event) { QPainter painter(this); QPoint pt; pt.setX(size().width() /2 - mMap.size().width() /2); pt.setY(size().height()/2 - mMap.size().height()/2); painter.drawPixmap(pt, mMap); painter.setBrush(Qt::SolidPattern); for( int i = mMarkers.length(); i>0; i--) { QPair<QPoint, int> marker = mMarkers.at(i-1); pt = marker.first; int r = marker.second; painter.fillRect(pt.x()-r, pt.y()-r, 2*r, 2*r, QColor(255, 0, 0)); } }

Now let s build the user interface (UI) part of the shopping cart. After updating the storefront, you ll have Add to Cart buttons for each product and a View Cart link in the cart summary box in the left part of the page. If the visitor s cart is empty, the link isn t displayed anymore, as you can see in Figure 8-4.

To create an Ant builder, select Project Properties from the Eclipse menu (alternatively you can right-click and select Properties or press Alt+Enter on the project s top node in the Navigator or Package Explorer). Next, select the Builders node as shown in Figure 3-9.

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The code begins by calculating the upper-left-hand corner where to draw the map so it s centered horizontally and vertically. It then loops through the collection of map markers, painting a red-filled rectangle at each marker position. The rectangle s size is twice the magnitude of the earthquake on each axis, providing a slight idea as to the earthquake s relative magnitude without causing too much overlapping between adjacent earthquakes unless they re very close. The remaining methods of the map widget are largely bookkeeping to manage the map model itself, as you can see from Listing 5 18.

Figure 8-4. The View Cart link doesn t show up if the cart is empty. If you added PayPal integration as presented in 6, you ll already have these buttons on your site, and you ll update their functionality here. When clicking on View Cart, the shopping cart componentized template (which you ll build later) is loaded in index.tpl. You can see this componentized component in action in Figure 8-1, shown earlier. The mechanism for loading the shopping cart componentized template is the same one you already used in index.php to load other components. When the Add to Cart button is clicked, index.php is reloaded with an additional parameter (CartAction) in the query string: http://localhost/hatshop/index.php CartAction=1&ProductID=10 When clicking on View Cart, the CartAction parameter added to the query string doesn t take any value. The shopping cart will have five cart actions, which are described using the following self-explanatory constants in the configuration file (include/config.php): ADD_PRODUCT, REMOVE_PRODUCT, UPDATE_PRODUCTS_QUANTITIES, SAVE_PRODUCT_FOR_LATER, and MOVE_PRODUCT_TO_CART.

Before moving on, let s recap the main steps you ll take to implement the whole UI of the shopping cart: 1. Modify the Add to Cart buttons to use the custom shopping cart. 2. Add a shopping cart summary box to index.tpl instead of the View Cart button. 3. Modify index.php to recognize the CartAction query string parameter. 4. Implement the cart_details componentized template.

Figure 3-9. TechConf Eclipse project properties dialog To create a new builder, click New in the Builders property dialog. Another dialog will appear asking to select the type of builder to create, as shown in Figure 3-10. Select the Ant Build option and click OK. You should now be presented with the Ant builder property dialog as shown in Figure 3-11. Enter a suitable name for the builder in the Name field such as TechConf Ant Builder . The dialog consists of several tabs of options. In the Main tab you can select the Ant buildfile to be used by the builder. Under the Buildfile field click Browse Workspace and find the build.xml file at the root of the techconf project.

Listing 5 18. Managing the view s model and its signals void MapItemWidget::setModel(QAbstractItemModel* model) { if (mModel) { disconnect(mModel, 0, this, 0); } mModel = model; if (mModel) { connect(mModel, SIGNAL(dataChanged(QModelIndex,QModelIndex)), this, SLOT(itemsChanged(QModelIndex,QModelIndex))); connect(mModel, SIGNAL(modelReset()), this, SLOT(itemsReset())); } initMarkers(); update(); } void MapItemWidget::itemsChanged(const QModelIndex&, const QModelIndex &) { initMarkers(); update(); } void MapItemWidget::itemsReset() { initMarkers(); update(); }

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