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, 2 insertions, 19 deletions

diff --git a/examples/widgets/mainwindows/application/mainwindow.h b/examples/widgets/mainwindows/application/mainwindow.h
index cb791abf00..08b4aa17f5 100644
--- a/examples/widgets/mainwindows/application/mainwindow.h
+++ b/examples/widgets/mainwindows/application/mainwindow.h
@@ -57,6 +57,8 @@ class MainWindow : public QMainWindow
 public:
     MainWindow();
 
+    void loadFile(const QString &fileName);
+
 protected:
     void closeEvent(QCloseEvent *event) Q_DECL_OVERRIDE;
 
@@ -70,35 +72,16 @@ private slots:
 
 private:
     void createActions();
-    void createMenus();
-    void createToolBars();
     void createStatusBar();
     void readSettings();
     void writeSettings();
     bool maybeSave();
-    void loadFile(const QString &fileName);
     bool saveFile(const QString &fileName);
     void setCurrentFile(const QString &fileName);
     QString strippedName(const QString &fullFileName);
 
     QPlainTextEdit *textEdit;
     QString curFile;
-
-    QMenu *fileMenu;
-    QMenu *editMenu;
-    QMenu *helpMenu;
-    QToolBar *fileToolBar;
-    QToolBar *editToolBar;
-    QAction *newAct;
-    QAction *openAct;
-    QAction *saveAct;
-    QAction *saveAsAct;
-    QAction *exitAct;
-    QAction *cutAct;
-    QAction *copyAct;
-    QAction *pasteAct;
-    QAction *aboutAct;
-    QAction *aboutQtAct;
 };
 //! [0]