Cleanup StarDelegate example

Cleanup the StarDelegate example:
 - use QStyledItemDelegate instead QItemDelegate
 - use nullptr and other useful c++11 constructs
 - include the correct headers

Change-Id: If2f65fe7cbdcdd4571d10ffa98d36eeab7836bbb
Reviewed-by: Sze Howe Koh <szehowe.koh@gmail.com>
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Luca Beldi <v.ronin@yahoo.it>

1 files changed, 11 insertions, 16 deletions

diff --git a/examples/widgets/itemviews/stardelegate/starrating.cpp b/examples/widgets/itemviews/stardelegate/starrating.cpp
index 845e474de9..15e14965e3 100644
--- a/examples/widgets/itemviews/stardelegate/starrating.cpp
+++ b/examples/widgets/itemviews/stardelegate/starrating.cpp
@@ -48,19 +48,18 @@
 **
 ****************************************************************************/
 
+#include "starrating.h"
+
 #include <QtWidgets>
 #include <cmath>
 
-#include "starrating.h"
-
-const int PaintingScaleFactor = 20;
+constexpr int PaintingScaleFactor = 20;
 
 //! [0]
 StarRating::StarRating(int starCount, int maxStarCount)
+    : myStarCount(starCount),
+      myMaxStarCount(maxStarCount)
 {
-    myStarCount = starCount;
-    myMaxStarCount = maxStarCount;
-
     starPolygon << QPointF(1.0, 0.5);
     for (int i = 1; i < 5; ++i)
         starPolygon << QPointF(0.5 + 0.5 * std::cos(0.8 * i * 3.14),
@@ -87,23 +86,19 @@ void StarRating::paint(QPainter *painter, const QRect &rect,
 
     painter->setRenderHint(QPainter::Antialiasing, true);
     painter->setPen(Qt::NoPen);
+    painter->setBrush(mode == EditMode::Editable ?
+                          palette.highlight() :
+                          palette.foreground());
 
-    if (mode == Editable) {
-        painter->setBrush(palette.highlight());
-    } else {
-        painter->setBrush(palette.foreground());
-    }
-
-    int yOffset = (rect.height() - PaintingScaleFactor) / 2;
+    const int yOffset = (rect.height() - PaintingScaleFactor) / 2;
     painter->translate(rect.x(), rect.y() + yOffset);
     painter->scale(PaintingScaleFactor, PaintingScaleFactor);
 
     for (int i = 0; i < myMaxStarCount; ++i) {
-        if (i < myStarCount) {
+        if (i < myStarCount)
             painter->drawPolygon(starPolygon, Qt::WindingFill);
-        } else if (mode == Editable) {
+        else if (mode == EditMode::Editable)
             painter->drawPolygon(diamondPolygon, Qt::WindingFill);
-        }
         painter->translate(1.0, 0.0);
     }