Polish the Icons example.

- Remove unneeded member variables.
- Use new connection syntax in createActions()
  to assemble the menu there, removing the createMenus()
  function.
- Use a QButtonGroup for the sizes with the style metrics as id.
- Streamline code, rename variables for clarity.
- Introduce static functions returning the list of states/modes and
  their names in display order to IconPreviewArea, removing the
  duplicates.
- Split actions to open sample icons provided from source directory
  or standard pictures location to make sample icons more prominently
  visible.
- Check and display @2x images and add tooltips showing device pixel
  ratio and actual size.
- HighDPI: Add groupbox displaying screen name and device pixel
  ratio, connect to screen changed signal and update icons panel
  accordingly. Add check box for toggling Qt::AA_UseHighDpiPixmaps.
- Adjust documentation

Task-number: QTBUG-18680
Task-number: QTBUG-46615
Change-Id: Ice96e9898f168ef2a30e9f46cb260ed57ae015f0
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/examples/widgets/widgets/icons/iconpreviewarea.h b/examples/widgets/widgets/icons/iconpreviewarea.h
index c2e0a7b79d..693f8811d8 100644
--- a/examples/widgets/widgets/icons/iconpreviewarea.h
+++ b/examples/widgets/widgets/icons/iconpreviewarea.h
@@ -43,6 +43,8 @@
 
 #include <QIcon>
 #include <QWidget>
+#include <QStringList>
+#include <QVector>
 
 QT_BEGIN_NAMESPACE
 class QLabel;
@@ -54,11 +56,16 @@ class IconPreviewArea : public QWidget
     Q_OBJECT
 
 public:
-    IconPreviewArea(QWidget *parent = 0);
+    explicit IconPreviewArea(QWidget *parent = Q_NULLPTR);
 
     void setIcon(const QIcon &icon);
     void setSize(const QSize &size);
 
+    static QVector<QIcon::Mode> iconModes();
+    static QVector<QIcon::State> iconStates();
+    static QStringList iconModeNames();
+    static QStringList iconStateNames();
+
 private:
     QLabel *createHeaderLabel(const QString &text);
     QLabel *createPixmapLabel();