Improve example so that we can demonstrate custom layout items.

Should show better how to reimplement setGeometry(), sizeHint()

2 files changed, 49 insertions, 13 deletions

diff --git a/examples/graphicsview/basicgraphicslayouts/layoutitem.cpp b/examples/graphicsview/basicgraphicslayouts/layoutitem.cpp
index 8216b6e..7311b65 100644
--- a/examples/graphicsview/basicgraphicslayouts/layoutitem.cpp
+++ b/examples/graphicsview/basicgraphicslayouts/layoutitem.cpp
@@ -43,19 +43,18 @@
 
 //! [0]
 LayoutItem::LayoutItem(QGraphicsItem *parent/* = 0*/)
-    : QGraphicsWidget(parent)
+    : QGraphicsLayoutItem(), QGraphicsItem(parent)
 {
-    pix = new QPixmap(QLatin1String(":/images/block.png"));
-    // Do not allow a size smaller than the pixmap with two frames around it.
-    setMinimumSize(pix->size() + QSize(12, 12));
+    m_pix = new QPixmap(QLatin1String(":/images/block.png"));
+    setGraphicsItem(this);
 }
 //! [0]
 
 LayoutItem::~LayoutItem()
 {
-    delete pix;
+    delete m_pix;
 }
- 
+
 //! [1]
 void LayoutItem::paint(QPainter *painter,
     const QStyleOptionGraphicsItem *option, QWidget *widget /*= 0*/)
@@ -64,8 +63,8 @@ void LayoutItem::paint(QPainter *painter,
     Q_UNUSED(option);
 
     QRectF frame(QPointF(0,0), geometry().size());
-    qreal w = pix->width();
-    qreal h = pix->height();
+    qreal w = m_pix->width();
+    qreal h = m_pix->height();
     QGradientStops stops;
 //! [1]
 
@@ -94,6 +93,39 @@ void LayoutItem::paint(QPainter *painter,
     gradient.setStops(stops);
     painter->setBrush(QBrush(gradient));
     painter->drawRoundedRect(innerFrame, 10.0, 10.0);
-    painter->drawPixmap(pixpos, *pix);
+    painter->drawPixmap(pixpos, *m_pix);
 }
 //! [2]
+
+//! [3]
+QRectF LayoutItem::boundingRect() const
+{
+    return QRectF(QPointF(0,0), geometry().size());
+}
+//! [3]
+
+//! [4]
+void LayoutItem::setGeometry(const QRectF &geom)
+{
+    prepareGeometryChange();
+    QGraphicsLayoutItem::setGeometry(geom);
+    setPos(geom.topLeft());
+}
+//! [4]
+
+//! [5]
+QSizeF LayoutItem::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
+{
+    switch (which) {
+    case Qt::MinimumSize:
+    case Qt::PreferredSize:
+        // Do not allow a size smaller than the pixmap with two frames around it.
+        return m_pix->size() + QSize(12, 12);
+    case Qt::MaximumSize:
+        return QSizeF(1000,1000);
+    default:
+        break;
+    }
+    return constraint;
+}
+//! [5]
diff --git a/examples/graphicsview/basicgraphicslayouts/layoutitem.h b/examples/graphicsview/basicgraphicslayouts/layoutitem.h
index cbda636..8ec9038 100644
--- a/examples/graphicsview/basicgraphicslayouts/layoutitem.h
+++ b/examples/graphicsview/basicgraphicslayouts/layoutitem.h
@@ -44,18 +44,22 @@
 #include <QtGui>
 
 //! [0]
-class LayoutItem : public QGraphicsWidget
+class LayoutItem : public QGraphicsLayoutItem, public QGraphicsItem
 {
-    Q_OBJECT
-
 public:
     LayoutItem(QGraphicsItem *parent = 0);
     ~LayoutItem();
+    // Inherited from QGraphicsLayoutItem
+    void setGeometry(const QRectF &geom);
+    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
+
+    // Inherited from QGraphicsItem
+    QRectF boundingRect() const;
     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
         QWidget *widget = 0);
 
 private:
-    QPixmap *pix;
+    QPixmap *m_pix;
 };
 //! [0]