Polish the mdi example.

Add a command line parser to be able to pass on files.

Task-number: QTBUG-35146
Change-Id: I32cbb9ec1e87667076e40a81c66674cf16836b54
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

examples/widgets/mainwindows/mdi/main.cpp

@@ -39,6 +39,8 @@
 ****************************************************************************/
 
 #include <QApplication>
+#include <QCommandLineParser>
+#include <QCommandLineOption>
 
 #include "mainwindow.h"
 
@@ -47,7 +49,17 @@ int main(int argc, char *argv[])
     Q_INIT_RESOURCE(mdi);
 
     QApplication app(argc, argv);
+    QCoreApplication::setApplicationVersion(QT_VERSION_STR);
+    QCommandLineParser parser;
+    parser.setApplicationDescription("Qt MDI Example");
+    parser.addHelpOption();
+    parser.addVersionOption();
+    parser.addPositionalArgument("file", "The file to open.");
+    parser.process(app);
+
     MainWindow mainWin;
+    foreach (const QString &fileName, parser.positionalArguments())
+        mainWin.openFile(fileName);
     mainWin.show();
     return app.exec();
 }

examples/widgets/mainwindows/mdi/mainwindow.cpp

@@ -95,16 +95,22 @@ void MainWindow::open()
             return;
         }
 
-        MdiChild *child = createMdiChild();
-        if (child->loadFile(fileName)) {
+        if (openFile(fileName))
             statusBar()->showMessage(tr("File loaded"), 2000);
-            child->show();
-        } else {
-            child->close();
-        }
     }
 }
 
+bool MainWindow::openFile(const QString &fileName)
+{
+    MdiChild *child = createMdiChild();
+    const bool succeeded = child->loadFile(fileName);
+    if (succeeded)
+        child->show();
+    else
+        child->close();
+    return succeeded;
+}
+
 void MainWindow::save()
 {
     if (activeMdiChild() && activeMdiChild()->save())

examples/widgets/mainwindows/mdi/mainwindow.h

@@ -59,6 +59,8 @@ class MainWindow : public QMainWindow
 public:
     MainWindow();
 
+    bool openFile(const QString &fileName);
+
 protected:
     void closeEvent(QCloseEvent *event) Q_DECL_OVERRIDE;