Add multipage example to pdf.pro; work with 5.14; fix main.cpp

- build the multipage example by default
- don't import anything that won't work with Qt 5.14
- set application attributes before creating an instance
  (to fix the warning about that)

Change-Id: I265f49ca75cae1908d4c23848cba8c42e5e3824b
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

examples/pdf/multipage/main.cpp

@@ -53,10 +53,11 @@
 
 int main(int argc, char* argv[])
 {
-    QApplication app(argc, argv);
     QCoreApplication::setApplicationName("Qt Quick Multi-page PDF Viewer Example");
     QCoreApplication::setOrganizationName("QtProject");
     QCoreApplication::setApplicationVersion(QT_VERSION_STR);
+    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+    QApplication app(argc, argv);
 
     QQmlApplicationEngine engine;
     engine.load(QUrl(QStringLiteral("qrc:///pdfviewer/viewer.qml")));

examples/pdf/pdf.pro

 TEMPLATE=subdirs
 
-SUBDIRS += pdfviewer
+SUBDIRS += pdfviewer multipage

examples/pdf/pdfviewer/main.cpp

@@ -53,11 +53,11 @@
 
 int main(int argc, char* argv[])
 {
-    QApplication app(argc, argv);
     QCoreApplication::setApplicationName("Qt Quick PDF Viewer Example");
     QCoreApplication::setOrganizationName("QtProject");
     QCoreApplication::setApplicationVersion(QT_VERSION_STR);
     QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+    QApplication app(argc, argv);
 
     QQmlApplicationEngine engine;
     engine.load(QUrl(QStringLiteral("qrc:///pdfviewer/viewer.qml")));

examples/pdf/pdfviewer/viewer.qml

@@ -47,12 +47,12 @@
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
-import QtQuick 2.15
-import QtQuick.Controls 2.15
-import QtQuick.Layouts 1.15
+import QtQuick 2.14
+import QtQuick.Controls 2.14
+import QtQuick.Layouts 1.14
 import QtQuick.Pdf 5.15
-import QtQuick.Shapes 1.15
-import QtQuick.Window 2.15
+import QtQuick.Shapes 1.14
+import QtQuick.Window 2.14
 import Qt.labs.platform 1.1 as Platform
 
 ApplicationWindow {