[Qt-qml] QDeclarativePropertyMap: bug or mistake?

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Sven Anderson

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Feb 14, 2012, 8:49:40 AM2/14/12

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Hi,

I'm using QDeclarativePropertyMap in my C++ extension, and I am
experiencing some binding proplems depending on the order of the items
in my QML file. The following test code produces a window with the text
"before.map.key1 = XXX, after.map.key4 = undefined", although the only
difference between the "before" and "after" item is their relative
position to the text item. Also any updates on the map work only on the
"before" item. I think this is a bug, but maybe I did a mistake, that I
don't see. (The problem is not, that the map property is a (QObject *)
instead of a (QDeclarativePropertyMap *), or that it is CONSTANT without
NOTIFY, I tried that already.)

Here is the code:
( alternatively here: http://pastebin.com/zZChEzBj )

#include <QtGui/QApplication>
#include <QtDeclarative>
#include <QDeclarativePropertyMap>
#include "qmlapplicationviewer.h"

class MyItem : public QObject {
Q_OBJECT
Q_PROPERTY(QStringList keys READ Keys WRITE SetKeys)
Q_PROPERTY(QObject *map READ Map CONSTANT)
public:
MyItem(QObject *parent = 0) : QObject(parent) {}

QStringList Keys() const { return map_.keys(); }
QDeclarativePropertyMap *Map() { return &map_; }

void SetKeys(const QStringList &keys) {
Q_FOREACH(QString key, keys) {
if (!map_.contains(key)) {
map_.insert(key, QVariant(QString("XXX")));
}
}
}
private:
QDeclarativePropertyMap map_;
};

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

QmlApplicationViewer viewer;
qmlRegisterType<MyItem>("Test", 1, 0, "MyItem");

viewer.setMainQmlFile(QLatin1String("qml/qmltest2/main.qml"));
viewer.showExpanded();

return app.exec();
}

#include "main.moc"

-------------------------------------------------------------------------------------------

import QtQuick 1.0
import Test 1.0

Rectangle {
width: 400
height: 200

MyItem {
id: before
keys: ["key1", "key2", "key3"]
Component.onCompleted: console.log("before item completed: " + keys)
}

Text {
text: "before.map.key1 = " + before.map.key1 + ", after.map.key4
= " + after.map.key4
anchors.centerIn: parent
}

MyItem {
id: after
keys: ["key4", "key5", "key6"]
Component.onCompleted: console.log("after item completed: " + keys)
}
}
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Sven Anderson

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Feb 24, 2012, 6:23:53 AM2/24/12

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Hi,

since nobody answered, I filed a bug now:
https://bugreports.qt-project.org/browse/QTBUG-24495

Regards

Sven

--
Dr. Sven Anderson
|-- Software Development --|
snom technology AG
tel: +49 30 39833 - 451
fax: +49 30 39833 - 111

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