Sorry I forgot to indicate that I'm using latest Qt release, installed
from the official Qt 5.3 online installer, using Ubuntu 14.04.
On Mon, May 26, 2014 at 4:04 PM, Juan Navarro <oneorj...@gmail.com> wrote:
> 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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