Keeping a DataModel object through several pages of QML

Hello

I have a simple question, but so far I have not been able to grasp the exact application. So I have a DataModel.cpp object that loads data from a JSON data file.

On my page main qml, the data model object is charged by attaching it with the following code...

      // The model itself is a QListDataModel defined in       // mydatamodel.h and registered as a type in the       // creation of the application.
      MyDataModel
      {
        id: dataModel

        // The path to the JSON file with initial data, this file         // will be moved to the data folder on the first launch         // of the application (in order to be able to get write access).
        jsonAssetPath: "app/native/assets/data/mydata.json"
      }

Now, from the Main.qml page, I can launch methods, get / set properties, attached signals etc...  for the dataModel object. This is perfect, but in case my application consists of several pages... ie:

Main.QML > AddNewItem.qml
           
On the Add QML page, I add a new object to the object MyDataModel.

> ViewItems.qml

On the points of view, a ListView is bound to the MyDataModel object.

> EditItem.qml

The edit page is called, and the user to apply changes to the MyDataModel

> ViewGraph.qml

On the graphic page, the data is distributed to the MyDataModel to display a graph.

I can re-gasket the MyDataModel on every pages, but this requires a complete reading of the JSON data set, but this isn't the right approach and leads in data refresh issue when adding, editing and deleting items.

QML, how can an object RPC be passed from one page to another qml... I quickly tried to set a property on the ViewItems.qml variant, but it generates a qml error: the value of the property Type mismatch "dataModel". Expecting DataModel and found zero.

Page
{
  property variant data

  ...
}

A simpler solution might be creating the dataModel once in the C++ code and the injection of the instance (not type) as a context for QML property. It will be accessible from all pages.

The above code, try to declare the property as regarding:

property alias data : listViewId.dataModel

then you can assign the qml outside:
qmlpage. Data = dataModelId

Tags: BlackBerry Developers

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