view.cpp Example File

drilldown/view.cpp
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#include "informationwindow.h" #include "imageitem.h" #include "view.h" View::View(const QString &items, const QString &images, QWidget *parent) : QGraphicsView(parent) { itemTable = new QSqlRelationalTableModel(this); itemTable->setTable(items); itemTable->setRelation(1, QSqlRelation(images, "itemid", "file")); itemTable->select(); scene = new QGraphicsScene(this); scene->setSceneRect(0, 0, 465, 365); setScene(scene); addItems(); setMinimumSize(470, 370); setMaximumSize(470, 370); QLinearGradient gradient(QPointF(0, 0), QPointF(0, 370)); gradient.setColorAt(0, QColor("#868482")); gradient.setColorAt(1, QColor("#5d5b59")); setBackgroundBrush(gradient); } void View::addItems() { int itemCount = itemTable->rowCount(); int imageOffset = 150; int leftMargin = 70; int topMargin = 40; for (int i = 0; i < itemCount; i++) { QSqlRecord record = itemTable->record(i); int id = record.value("id").toInt(); QString file = record.value("file").toString(); QString item = record.value("itemtype").toString(); int columnOffset = ((i % 2) * 37); int x = ((i % 2) * imageOffset) + leftMargin + columnOffset; int y = ((i / 2) * imageOffset) + topMargin; ImageItem *image = new ImageItem(id, QPixmap(":/" + file)); image->setData(0, i); image->setPos(x, y); scene->addItem(image); QGraphicsTextItem *label = scene->addText(item); label->setDefaultTextColor(QColor("#d7d6d5")); QPointF labelOffset((120 - 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 >= itemTable->rowCount()) return; InformationWindow *window = findWindow(id); if (!window) { window = new InformationWindow(id, itemTable, this); connect(window, QOverload<int,const QString &>::of(&InformationWindow::imageChanged), this, QOverload<int,const QString &>::of(&View::updateImage)); window->move(pos() + QPoint(20, 40)); window->show(); informationWindows.append(window); } if (window->isVisible()) { window->raise(); window->activateWindow(); } else window->show(); } 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) const { for (auto window : informationWindows) { if (window && (window->id() == id)) return window; } return nullptr; }