Unable to change the property after using Loader

[rannamal]

Hi ,

I am new to QML, please pardon me if its a very obvious question.

I have created a progress bar element using QML and i am able to update the value of the progress bar by the following code.

QDeclarativeView* progressView = new QDeclarativeView;
  progressView->setSource(QUrl("Progressbar.qml"));
  setCentralWidget(progressView);
 
  QObject *rootObject = dynamic_cast<QObject *>(progressView->rootObject());
  QObject *progressQml = rootObject->findChild<QObject *>(QString("progressBar")); //progressBar is the name of the progressbar object.
  image->setProperty("value", 99);

QDeclarativeView* progressView = new QDeclarativeView;
  progressView->setSource(QUrl("Progressbar.qml"));
  setCentralWidget(progressView);

  QObject *rootObject = dynamic_cast<QObject *>(progressView->rootObject());
  QObject *progressQml = rootObject->findChild<QObject *>(QString("progressBar")); //progressBar is the name of the progressbar object.
  image->setProperty("value", 99);

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The issue is, I am not able to update the view if i load the "Progressbar.qml" from another file "Main.qml" using the loader functionality. Code with issue is as follows.

QDeclarativeView* mainView = new QDeclarativeView;
  mainView->setSource(QUrl("main.qml"));
  setCentralWidget(mainView);
 
 QDeclarativeView* progressView = new QDeclarativeView;
  progressView->setSource(QUrl("Progressbar.qml"));
  QObject *rootObject = dynamic_cast<QObject *>(progressView->rootObject());
  QObject *progressQml = rootObject->findChild<QObject *>(QString("progressBar"));
  image->setProperty("value", 99);

QDeclarativeView* mainView = new QDeclarativeView;
  mainView->setSource(QUrl("main.qml"));
  setCentralWidget(mainView);

 QDeclarativeView* progressView = new QDeclarativeView;
  progressView->setSource(QUrl("Progressbar.qml"));
  QObject *rootObject = dynamic_cast<QObject *>(progressView->rootObject());
  QObject *progressQml = rootObject->findChild<QObject *>(QString("progressBar"));
  image->setProperty("value", 99);

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The main.qml file contents are as follwos.

import QtQuick 1.0
 
 Rectangle {
     id: rect
     width: 400; height: 400
     color: "yellow"
 
    Loader {
	id:someLoader
    }
 
     MouseArea {
         anchors.fill: parent
         onClicked: {
			someLoader.source = "Progressbar.qml" 
	  }
     }
 }

import QtQuick 1.0

 Rectangle {
     id: rect
     width: 400; height: 400
     color: "yellow"

    Loader {
	id:someLoader
    }

     MouseArea {
         anchors.fill: parent
         onClicked: {
			someLoader.source = "Progressbar.qml" 
	  }
     }
 }

To copy to clipboard, switch view to plain text mode 

Please let me know how i can overcome this problem.

[rannamal]

Hi ,

I am new to QML, please pardon me if its a very obvious question.

I have created a progress bar element using QML and i am able to update the value of the progress bar by the following code.

QDeclarativeView* progressView = new QDeclarativeView;
  progressView->setSource(QUrl("Progressbar.qml"));
  setCentralWidget(progressView);
 
  QObject *rootObject = dynamic_cast<QObject *>(progressView->rootObject());
  QObject *progressQml = rootObject->findChild<QObject *>(QString("progressBar")); //progressBar is the name of the progressbar object.
  progressQML->setProperty("value", 99);

QDeclarativeView* progressView = new QDeclarativeView;
  progressView->setSource(QUrl("Progressbar.qml"));
  setCentralWidget(progressView);

  QObject *rootObject = dynamic_cast<QObject *>(progressView->rootObject());
  QObject *progressQml = rootObject->findChild<QObject *>(QString("progressBar")); //progressBar is the name of the progressbar object.
  progressQML->setProperty("value", 99);

To copy to clipboard, switch view to plain text mode 

The issue is, I am not able to update the view if i load the "Progressbar.qml" from another file "Main.qml" using the loader functionality. Code with issue is as follows.

QDeclarativeView* mainView = new QDeclarativeView;
  mainView->setSource(QUrl("main.qml"));
  setCentralWidget(mainView);
 
 QDeclarativeView* progressView = new QDeclarativeView;
  progressView->setSource(QUrl("Progressbar.qml"));
  QObject *rootObject = dynamic_cast<QObject *>(progressView->rootObject());
  QObject *progressQml = rootObject->findChild<QObject *>(QString("progressBar"));
  progressQml->setProperty("value", 99);

QDeclarativeView* mainView = new QDeclarativeView;
  mainView->setSource(QUrl("main.qml"));
  setCentralWidget(mainView);

 QDeclarativeView* progressView = new QDeclarativeView;
  progressView->setSource(QUrl("Progressbar.qml"));
  QObject *rootObject = dynamic_cast<QObject *>(progressView->rootObject());
  QObject *progressQml = rootObject->findChild<QObject *>(QString("progressBar"));
  progressQml->setProperty("value", 99);

To copy to clipboard, switch view to plain text mode 

The main.qml file contents are as follwos.

import QtQuick 1.0
 
 Rectangle {
     id: rect
     width: 400; height: 400
     color: "yellow"
 
    Loader {
	id:someLoader
    }
 
     MouseArea {
         anchors.fill: parent
         onClicked: {
			someLoader.source = "Progressbar.qml" 
	  }
     }
 }

import QtQuick 1.0

 Rectangle {
     id: rect
     width: 400; height: 400
     color: "yellow"

    Loader {
	id:someLoader
    }

     MouseArea {
         anchors.fill: parent
         onClicked: {
			someLoader.source = "Progressbar.qml" 
	  }
     }
 }

To copy to clipboard, switch view to plain text mode 

Please let me know how i can overcome this problem.

Please find the above modified code.

Is it just because i am updating a view which is different from the one loaded in the main.qml ?