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, 26 insertions, 0 deletions

diff --git a/examples/widgets/widgets/icons/main.cpp b/examples/widgets/widgets/icons/main.cpp
index 842a474405..d6a823f1c7 100644
--- a/examples/widgets/widgets/icons/main.cpp
+++ b/examples/widgets/widgets/icons/main.cpp
@@ -39,13 +39,39 @@
 ****************************************************************************/
 
 #include <QApplication>
+#include <QCommandLineParser>
+#include <QDesktopWidget>
 
 #include "mainwindow.h"
 
+//! [45]
 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
+    QCoreApplication::setApplicationName(MainWindow::tr("Icons"));
+    QCoreApplication::setApplicationVersion(QT_VERSION_STR);
+    QCommandLineParser commandLineParser;
+    commandLineParser.setSingleDashWordOptionMode(QCommandLineParser::ParseAsLongOptions);
+    commandLineParser.addHelpOption();
+    commandLineParser.addVersionOption();
+    QCommandLineOption noHighDpiPixmapOption("no-highdpi-pixmaps",
+                                             "Disable High DPI image loading (Qt::AA_UseHighDpiPixmaps)");
+    commandLineParser.addOption(noHighDpiPixmapOption);
+        commandLineParser.addPositionalArgument(MainWindow::tr("[file]"), MainWindow::tr("Icon file(s) to open."));
+    commandLineParser.process(QCoreApplication::arguments());
+
+    if (!commandLineParser.isSet(noHighDpiPixmapOption))
+        QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
+
     MainWindow mainWin;
+    if (!commandLineParser.positionalArguments().isEmpty())
+        mainWin.loadImages(commandLineParser.positionalArguments());
+
+    const QRect availableGeometry = QApplication::desktop()->availableGeometry(&mainWin);
+    mainWin.resize(availableGeometry.width() / 2, availableGeometry.height() * 2 / 3);
+    mainWin.move((availableGeometry.width() - mainWin.width()) / 2, (availableGeometry.height() - mainWin.height()) / 2);
+
     mainWin.show();
     return app.exec();
 }
+//! [45]