SQL/drilldown example: add new icons and misc cleanup

Cleanup the drilldown example:
 - use icons with the current style
 - remove unneeded QOverload<>
 - remove some empty lines which don't look good in the documentation
 - use Q_SLOTS/Q_SIGNALS instead slots/signals

Fixes: QTBUG-113696
Change-Id: I62476a8989c0abd1f424d1425cb05489491e2153
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

examples/sql/doc/src/drilldown.qdoc

@@ -46,8 +46,8 @@
     \snippet drilldown/informationwindow.h 0
 
     When we create an information window, we pass the associated
-    item ID, a parent, and a pointer to the database, to the
-    constructor. We will use the database pointer to populate our
+    item ID, a pointer to the model, and a parent to the
+    constructor. We will use the model pointer to populate our
     window with data, while passing the parent parameter on to the
     base class. The ID is stored for future reference.
 

examples/sql/drilldown/imageitem.cpp

@@ -54,7 +54,7 @@ void ImageItem::setFrame(int frame)
     QPointF center = boundingRect().center();
 
     setTransform(QTransform::fromTranslate(center.x(), center.y()), true);
-    setTransform(QTransform::fromScale(1 + frame / 330.0, 1 + frame / 330.0), true);
+    setTransform(QTransform::fromScale(1 + frame / 300.0, 1 + frame / 300.0), true);
     setTransform(QTransform::fromTranslate(-center.x(), -center.y()), true);
 }
 //! [3]
@@ -62,8 +62,8 @@ void ImageItem::setFrame(int frame)
 //! [4]
 void ImageItem::adjust()
 {
-    setTransform(QTransform::fromScale(120 / boundingRect().width(),
-                                       120 / boundingRect().height()));
+    setTransform(QTransform::fromScale(120.0 / boundingRect().width(),
+                                       120.0 / boundingRect().height()));
 }
 //! [4]
 

examples/sql/drilldown/imageitem.h

@@ -11,7 +11,6 @@
 class ImageItem : public QObject, public QGraphicsPixmapItem
 {
     Q_OBJECT
-
 public:
     enum { Type = UserType + 1 };
 
@@ -25,7 +24,7 @@ protected:
     void hoverEnterEvent(QGraphicsSceneHoverEvent *event) override;
     void hoverLeaveEvent(QGraphicsSceneHoverEvent *event) override;
 
-private slots:
+private Q_SLOTS:
     void setFrame(int frame);
     void updateItemPosition();
 

examples/sql/drilldown/informationwindow.cpp

@@ -37,8 +37,8 @@ InformationWindow::InformationWindow(int id, QSqlRelationalTableModel *items,
 //! [3]
 
 //! [4]
-    connect(descriptionEditor, &QTextEdit::textChanged, this, [this]() { enableButtons(); });
-    connect(imageFileEditor, &QComboBox::currentIndexChanged, this, [this]() { enableButtons(); });
+    connect(descriptionEditor, &QTextEdit::textChanged, this, [this]() { enableButtons(true); });
+    connect(imageFileEditor, &QComboBox::currentIndexChanged, this, [this]() { enableButtons(true); });
 
     QFormLayout *formLayout = new QFormLayout;
     formLayout->addRow(itemLabel, itemText);

examples/sql/drilldown/informationwindow.h

@@ -11,22 +11,20 @@
 class InformationWindow : public QDialog
 {
     Q_OBJECT
-
 public:
     InformationWindow(int id, QSqlRelationalTableModel *items,
                       QWidget *parent = nullptr);
-
     int id() const;
 
-signals:
+Q_SIGNALS:
     void imageChanged(int id, const QString &fileName);
 //! [0]
 
 //! [1]
-private slots:
+private Q_SLOTS:
     void revert();
     void submit();
-    void enableButtons(bool enable = true);
+    void enableButtons(bool enable);
 //! [1]
 
 //! [2]

examples/sql/drilldown/view.cpp

@@ -87,8 +87,8 @@ void View::showInformation(ImageItem *image)
     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));
+        connect(window, &InformationWindow::imageChanged,
+                this, &View::updateImage);
 
         window->move(pos() + QPoint(20, 40));
         window->show();

examples/sql/drilldown/view.h

@@ -14,7 +14,6 @@ class InformationWindow;
 class View : public QGraphicsView
 {
     Q_OBJECT
-
 public:
     View(const QString &items, const QString &images, QWidget *parent = nullptr);
 
@@ -23,7 +22,7 @@ protected:
 //! [0]
 
 //! [1]
-private slots:
+private Q_SLOTS:
     void updateImage(int id, const QString &fileName);
 //! [1]