Change the properties of qml with cpp in run*time

[AcerExtensa]

Can you just copy the whole error here?
Delete "this->" or delete whole emit statement it is not relevant in this example....

[Guest]

Can u help me with this example. I understand this better.
.qml file
@Rectangle {
id:rect1
signal dataRequired;
signal onchangecolor;
width:250
height:250

function updateData(text) { dataText.text = text}  // slot
function updatecolor(color){rect1.color="red"}

anchors.fill: parent; color: "black"

Text {
    id: dataText
    anchors.centerIn: parent; color: "white"
}

MouseArea {
    anchors.fill: parent
    onClicked:[ dataRequired(),
        onchangecolor()]
}

}@

[Guest]

@#include <QApplication>
#include <QGraphicsObject>
#include <QDeclarativeView>
#include "MyClass.h"

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

MyClass myClass;

QDeclarativeView view;
view.setSource(QUrl("MyItem.qml"));
view.show();
view.setResizeMode(QDeclarativeView::SizeRootObjectToView);

QObject *rootObject = dynamic_cast<QObject*>(view.rootObject());

QObject::connect(rootObject, SIGNAL(dataRequired()), &myClass, SLOT(getData()));
QObject::connect(&myClass, SIGNAL(data(QVariant)), rootObject, SLOT(updateData(QVariant)));

return app.exec();

}
@

[Guest]

@#ifndef MYCLASS_H
#define MYCLASS_H

#include <QObject>
#include <QVariant>

class MyClass : public QObject
{
Q_OBJECT

public:
MyClass() {}

public slots:
void getData() {
QString nm("Hello");
emit data(QVariant(nm));
}

signals:
void data(QVariant data);

};

#endif // MYCLASS_H
@

[Guest]

@Acerextensa: I want to change the color of the rectange using signals and slots cud u help me with the code or an idea. I tried this but could not understandt the concept. Thanks a ton for the help..:) I added the signal oncolorchange

[AcerExtensa]

Pack your project in archive and load somewhere on the web. Don't forget to post the link.

[Guest]

http://www.file-upload.net/download-4697440/binding.zip.html

[AcerExtensa]

You have already done signal/slot connection for text in your code. Which concept do you not understand?

"binding.zip":http://vip2006.net/binding.zip

[Guest]

I know, that was an example. what should I do if i have to change the color of rectangle rect1, how should the property, function and signal be defined. say I want to change rect1 to yellow.

[AcerExtensa]

Why can't you just read links I've posted for you?
Examples there, is exactly what you are asking here!

bq. The child could be located like this:
@ QObject rect = object->findChild<QObject>("rect");
if (rect)
rect->setProperty("color", "red");@

Just change the name of object in findChild function from "rect" to "rect1" that's all. Please read it! I would not help you anymore if you will ask question which already explained in examples from tutorials again... Sorry...