[Solved] How to call refresh method(s) in QML/C++

[shav]

Hi guys!

I have a problem with refresh all components in my QML app. I have created a many QML files as small visual component for design. The application must get access to the files in the user's folder. So, I need to use open file for read informations from it and display it to user using QML components. I don't know how I can do it using C++ or QML. The source of main.qml file looks like this:

@import QtQuick 1.1
import Qt 4.7
import Mdl 1.0

Rectangle {
id: mainWindow
width: 1024
height: 768
color: "transparent"
clip: true

MdlLogViewerManager {
    property variant geoIp
    id: viewer
    objectName: "viewer"

parser: MdlLogParser {
// logFilePath: ":/log_map_MdlTest_1347293543.mdl"

        onParserDidFinished: {
            console.log("Refresh method(s) must be called here!!!");
        }

}
}

Rectangle {
    anchors.fill: parent
    color: "transparent"
    clip: true

    LeftSideBar {
        id: leftBar
        color: "black"
        width: 400
        height: parent.height
        x: -leftBar.width

        NumberAnimation {
            running: true
            target: leftBar
            property: "x"
            duration: 700
            easing.type: Easing.InOutBack
            to: 0
        }
     }

    ContentView {

id:contentView
width: parent.width - 400
height: parent.height
x: leftBar.width
y: -parent.width
color: "transparent"

        NumberAnimation { running: true
            target: contentView
            property: "y"
            duration: 1000
            easing.type: Easing.InOutBack
            to: 0
        }
    }
}

}
@

The MdlLogViewerManager is a QObject subclass which work with file contents. When object is finished work his send a signal about it and main QML component received it. So, what I must added to my QML or C++ code for redraw all components? Thanks.

P.S. The method for opening file looks like this:
@ QString fileName = QFileDialog::getOpenFileName(this, tr("Open MDL Log"),
"",
tr("MDL Files (*.mdl)"));

if(!fileName.isEmpty())
{
    QDeclarativeItem *rootObject = dynamic_cast<QDeclarativeItem *>(viewer->rootObject());
    viewerManager = (MdlLogViewerManager*)rootObject->findChild<QObject *>(QString("viewer"));
    viewerManager->getParser()->setLogFilePath(fileName);
    //rootObject->update(rootObject->x(), rootObject->y(), rootObject->width(), rootObject->height());
    viewer->update();
    //viewer->setMainQmlFile&#40;QLatin1String("qml/MdlViewer/main.qml"&#41;&#41;;
}

@

Please tell me what I do wrong. Thanks for the any help!

[dmcr]

Hello,

An update or redraw is not really a solution, i think, as you may later need to keep some value of your ui.

If you want to call a C++ function, you can use a contexed object, ie use QDeclarativeContext to reach a C++ object from QML.

Then, if your method is declared as Q_INVOKABLE (or is a slot) you can interact with it from QML easily.

really an update seems a bad idea!

[shav]

[quote author="dmcr" date="1352974106"]Hello,

An update or redraw is not really a solution, i think, as you may later need to keep some value of your ui.

If you want to call a C++ function, you can use a contexed object, ie use QDeclarativeContext to reach a C++ object from QML.

Then, if your method is declared as Q_INVOKABLE (or is a slot) you can interact with it from QML easily.

really an update seems a bad idea!
[/quote]

Thanks for the reply!

I have a methods for get all informations from C++ objects but I don't know how I can change values for QML component which using it. For example, I have a component which show some parameter as table. When I load app it's clear and when user opened a some file this component must show a new data. In C++ object all data was updated correctly. So, the question is how I can change value in QML? Must I added code like this:

@ QDeclarativeItem item = qobject_cast<QDeclarativeItem>(object);
item->setWidth(500);@

for update every data or exist more powerfully way? I need update a may component, and some of them is created from QML files.

[dmcr]

You have many ways to interact with QML.
The two main ones are :

A Context* myContext which is a QObject, which could be an object that keeps all the data you want to share with QML.
and inside it have some properties like :
@
Q_PROPERTY(int progressBarDuration READ getProgressBarDuration WRITE setProgressBarDuration NOTIFY progressBarDurationChanged)@
then with @yourDeclarativeView->rootContext()->setContextProperty("Context", myContext);@
and inside
you can access throught Context.progressBarDuration

A QDeclarativeItem is rarely created in Cpp, but you could, however.
You could also declare it, and then using in QML like any other component with some import.

In your example i think the first approach may be better, ie using a kind of Context.logViewerManager.
Then, if you have some lists, use setContextProperty(my model....

However everything is in the doc :)

[shav]

[quote author="dmcr" date="1352988312"]You have many ways to interact with QML.
The two main ones are :

A Context* myContext which is a QObject, which could be an object that keeps all the data you want to share with QML.
and inside it have some properties like :
@
Q_PROPERTY(int progressBarDuration READ getProgressBarDuration WRITE setProgressBarDuration NOTIFY progressBarDurationChanged)@
then with @yourDeclarativeView->rootContext()->setContextProperty("Context", myContext);@
and inside
you can access throught Context.progressBarDuration

A QDeclarativeItem is rarely created in Cpp, but you could, however.
You could also declare it, and then using in QML like any other component with some import.

In your example i think the first approach may be better, ie using a kind of Context.logViewerManager.
Then, if you have some lists, use setContextProperty(my model....

However everything is in the doc :)
[/quote]

Thanks! It's exactly what I need! Thanks for the help!