Hi there;
i'm struggling with the behavior of ApplicationWindow and I found that
it only opens a window when used directly from main() but not from a
custom class. Let's explain with an example:
----
main.qml:
import QtQuick 2.2
import QtQuick.Controls 1.1
ApplicationWindow {
visible: true
width: 640
height: 480
Text {
text: "Hello World"
anchors.centerIn: parent
}
}
----
main.cpp:
#include <QApplication>
#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QObject>
#include <QWidget>
#include <QUrl>
class MainWindow1
{
public:
MainWindow1()
{ QQmlApplicationEngine engine("main.qml"); }
};
class MainWindow2 : public QObject
{
public:
MainWindow2(QObject* parent = 0)
: QObject(parent)
{ QQmlApplicationEngine engine("main.qml"); }
};
class MainWindow3 : public QWidget
{
public:
MainWindow3(QWidget* parent = 0, Qt::WindowFlags flags = 0)
: QWidget(parent, flags)
{ QQmlApplicationEngine engine("main.qml"); }
};
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
// MainWindow1 window;
// MainWindow2 window;
// MainWindow3 window;
QQmlApplicationEngine engine("main.qml");
return app.exec();
}
----
Check the main() function: only with the uncommented code I get to see
a new Window which shows the "Hello World" text. If we comment that
and uncomment any of the other 3 options, which use a custom
"MainWindow" class, then nothing will come out. I derived MainWindow
from QObject and QWidget in hopes to find some solution, but I
actually would think that a standalone MainWindow class should suffice
for this basic usage scenario.
Is it a bug or I am misusing this class?
Also, extracting the inner QQuickWindow and forcing a call to show()
doesn't work; ie:
MainWindow1()
{
QQmlApplicationEngine engine("main.qml");
Q_ASSERT(engine.rootObjects().size() > 0);
QQuickWindow* window =
qobject_cast<QQuickWindow*>(engine.rootObjects().at(0));
window->show();
}
doesn't work.
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