CODEWITHSUNDEEP
c++qtqml
krzysztof
krzysztof

Reputation: 89

QQuickWindow subclass, visibilityChanged and closing signals

I'm trying to create own window class and use it in QML. In first steps I'm trying to subclass QQuickWindow in this way:

class TestWindow : public QQuickWindow {
Q_OBJECT
...
};

then in main.cpp file:

qmlRegisterType<TestWindow>("test.components", 1, 0, "TestWindow");

now in QML I can simply use it in such way:

import test.components 1.0
TestWindow {
    //onClosing: console.log("closing")
    //onVisibilityChanged: console.log(visibility)
}

The problem appears when I'll try to uncomment one of these lines. QML engine says that: ""TestWindow.onVisibilityChanged" is not available in test.components 1.0." Similar thing happens in case of "onClosing". I should be inherited from QWindow/QQuickWindow but I tried to create own anyway.

  //connect(this, QQuickWindow::visibilityChanged, this, TestWindow::visibilityChanged);

and declare appropriate Q_PROPERTY with READ/WRITE and NOTIFY section defined as well. I replaced closing signal with "closingEvent" and did something like this:

//connect(this, SIGNAL(closing(QQuickCloseEvent*)), this, SIGNAL(closingEvent(QQuickCloseEvent*)));

which is also strange cuz when I try to use new signals/slots syntax, the compiler complains about incomplete QQuickCloseEvent which isn't described anywhere and seems to be something from Qt internals. So I had to stick with older code version.

After these treatments, The other "Window" (not TestWindow) from import QtQuick.Window 2.2 says that "x" and "y" properties are undefined. The more warnings/errors I'll try to fix, the more other things stops to work properly.

Has anyone had a similar problem?

edit: I find out that it has something to do with Q_REVISION macro used in case of some signals/slots/properties for both QWindow and QQuickWindow. I even tried to use these lines:

//qmlRegisterType<TestWindow>("test.components", 1, 0, "TestWindow");
//qmlRegisterType<TestWindow, 1>("test.components", 1, 0, "TestWindow");
qmlRegisterType<TestWindow, 2>("test.components", 1, 0, "TestWindow");

still without success.

Upvotes: 1

Views: 1033

Answers (1)

krzysztof
krzysztof

Reputation: 89

I found a solution.

  qmlRegisterType<TestWindow>("test.components", 1, 0, "TestWindow");
  qmlRegisterRevision<QWindow, 1>("test.components", 1, 0);
  qmlRegisterRevision<QQuickWindow, 1>("test.components", 1, 0);

I had to register revisions of base classes as well. The explanation described here: https://bugreports.qt.io/browse/QTBUG-22688 in comment.

Upvotes: 4

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