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# view.cpp Example File
sql/drilldown/view.cpp

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     ** This file is part of the documentation of the Qt Toolkit.
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     ** This file may be used under the terms of the GNU General Public
    ** License versions 2.0 or 3.0 as published by the Free Software
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     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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     #include "informationwindow.h"
     #include "imageitem.h"
     #include "view.h"

     View::View(const QString &offices, const QString &images, QWidget *parent)
         : QGraphicsView(parent)
     {
         officeTable = new QSqlRelationalTableModel(this);
         officeTable->setTable(offices);
         officeTable->setRelation(1, QSqlRelation(images, "locationid", "file"));
         officeTable->select();

         scene = new QGraphicsScene(this);
         scene->setSceneRect(0, 0, 465, 615);
         setScene(scene);

         addItems();

         QGraphicsPixmapItem *logo = scene->addPixmap(QPixmap(":/logo.png"));
         logo->setPos(30, 515);

         setMinimumSize(470, 620);
         setMaximumSize(470, 620);
         setWindowTitle(tr("Trolltech World Wide"));
     }

     void View::addItems()
     {
         int officeCount = officeTable->rowCount();

         int imageOffset = 150;
         int leftMargin = 70;
         int topMargin = 40;

         for (int i = 0; i < officeCount; i++) {
             ImageItem *image;
             QGraphicsTextItem *label;
             QSqlRecord record = officeTable->record(i);

             int id = record.value("id").toInt();
             QString file = record.value("file").toString();
             QString location = record.value("location").toString();

             int columnOffset = ((i / 3) * 37);
             int x = ((i / 3) * imageOffset) + leftMargin + columnOffset;
             int y = ((i % 3) * imageOffset) + topMargin;

             image = new ImageItem(id, QPixmap(":/" + file));
             image->setData(0, i);
             image->setPos(x, y);
             scene->addItem(image);

             label = scene->addText(location);
             QPointF labelOffset((150 - label->boundingRect().width()) / 2, 120.0);
             label->setPos(QPointF(x, y) + labelOffset);
         }
     }

     void View::mouseReleaseEvent(QMouseEvent *event)
     {
         if (QGraphicsItem *item = itemAt(event->pos())) {
             if (ImageItem *image = qgraphicsitem_cast<ImageItem *>(item))
                 showInformation(image);
         }
         QGraphicsView::mouseReleaseEvent(event);
     }

     void View::showInformation(ImageItem *image)
     {
         int id = image->id();
         if (id < 0 || id >= officeTable->rowCount())
             return;

         InformationWindow *window = findWindow(id);
         if (window && window->isVisible()) {
             window->raise();
             window->activateWindow();
         } else if (window && !window->isVisible()) {
             window->show();
         } else {
             InformationWindow *window;
             window = new InformationWindow(id, officeTable, this);

             connect(window, SIGNAL(imageChanged(int, QString)),
                     this, SLOT(updateImage(int, QString)));

             window->move(pos() + QPoint(20, 40));
             window->show();
             informationWindows.append(window);
         }
     }

     void View::updateImage(int id, const QString &fileName)
     {
         QList<QGraphicsItem *> items = scene->items();

         while(!items.empty()) {
             QGraphicsItem *item = items.takeFirst();

             if (ImageItem *image = qgraphicsitem_cast<ImageItem *>(item)) {
                 if (image->id() == id){
                     image->setPixmap(QPixmap(":/" +fileName));
                     image->adjust();
                     break;
                 }
             }
         }
     }

     InformationWindow* View::findWindow(int id)
     {
         QList<InformationWindow*>::iterator i, beginning, end;

         beginning = informationWindows.begin();
         end = informationWindows.end();

         for (i = beginning; i != end; ++i) {
             InformationWindow *window = (*i);
             if (window && (window->id() == id))
                 return window;
         }
         return 0;
     }