Polish the widgets/mainwindows/application example.

- Introduce Qt 5 signals & slot syntax
- Use QCommandLineParser to obtain file arguments
- Merge MainWindow::createMenus()/createQToolBars()
  into MainWindow::createActions(), removing the need
  to store the actions as member variables.
  Use QMenu::addAction() for brevity.
- Use QIcon::fromTheme() to obtain system icons and use
  resource icons as fallback.
- Rewrite settings code to use
  QWidget::saveGeometry(), Widget::restoreGeometry() since
  saving size and position does not work well with multiple
  screens. Query the available size when determining
  the initial size instead of using hard-coded values
  for High-DPI screens.
- Fix minor issues in code, use multi-argument version
  of QString::arg(), QDir::toNativeSeparators() to
  present file paths to the user.
- Fix snippet references accordingly.

Change-Id: I1bc49a8913aa6d669e0e666f04be3f1f42eaba10
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@theqtcompany.com>
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>

1 files changed, 14 insertions, 2 deletions

diff --git a/examples/widgets/mainwindows/application/main.cpp b/examples/widgets/mainwindows/application/main.cpp
index 41913db07e..73c1cf57d3 100644
--- a/examples/widgets/mainwindows/application/main.cpp
+++ b/examples/widgets/mainwindows/application/main.cpp
@@ -40,6 +40,8 @@
 
 //! [0]
 #include <QApplication>
+#include <QCommandLineParser>
+#include <QCommandLineOption>
 
 #include "mainwindow.h"
 
@@ -48,9 +50,19 @@ int main(int argc, char *argv[])
     Q_INIT_RESOURCE(application);
 
     QApplication app(argc, argv);
-    app.setOrganizationName("QtProject");
-    app.setApplicationName("Application Example");
+    QCoreApplication::setOrganizationName("QtProject");
+    QCoreApplication::setApplicationName("Application Example");
+    QCoreApplication::setApplicationVersion(QT_VERSION_STR);
+    QCommandLineParser parser;
+    parser.setApplicationDescription(QCoreApplication::applicationName());
+    parser.addHelpOption();
+    parser.addVersionOption();
+    parser.addPositionalArgument("file", "The file to open.");
+    parser.process(app);
+
     MainWindow mainWin;
+    if (!parser.positionalArguments().isEmpty())
+        mainWin.loadFile(parser.positionalArguments().first());
     mainWin.show();
     return app.exec();
 }