[Qt-qml] Access to element property

[Tobias Renz]

Hi,

If your code example below is right I think you might be wrong on how to use the list view.

Typically you would set your values in the data model

ListModel {
     id: data

     ListElement {
	   value: "value1"
     }
     ListElement {
	   value: "value2"
     }
     ListElement {
	   value: "value3"
     }
 }

Setting it to the listView would be the same as you did:

    ListView {
        id: listView
        ...
        model: data

        delegate: rowComponent

    } // End of ListView id: listView

But then the delegate would only be one element of the list. The list itself would generate the elements in the "column".

    Component {
        id: rowComponent

        Text {
            id: element
            value: model.value
		text: model.value
        }

=> The ListView will now show three Text-Elements below each other in a List or "Column". Showing the value. The key is that you bind the value from the model to the element in the list.
   Then the value is already stored in the model which you call data. If you want to change the value you would directly change it in the model then the value in the list aka in the delegate will also change.

But I'm not sure if this is the intended use of your program or if you want to do something special with ListView?

Regards,
Tobias

Date: Fri, 25 Feb 2011 13:04:06 +0100
From: Thomas PABST <thomas.pabst at gmail.com>
Subject: [Qt-qml] Access to element property
To: "qt-qml.qt.nokia.com" <Qt-qml at qt.nokia.com>
Message-ID:
	<AANLkTinRX7EC1y5b8WubamG0obBvCXkZj8MDVy5f6yCz at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Hi,

I'm currently trying to get value from an QML element which is the delegate of a ListView, but the variable cannot be found.
With the function saveData() I would like to get the value from RowElement where the id is element1. But qmlViewer return a ReferenceError: Can't find
variable: element1.
Is there a way to get it ?

The following example implement only properties necessary to understand the problem.

thanks


Item {
    id: main

    property variant data

    function saveData()
    {
        data.value = element1.value;
        ...
    }

    ListView {
        id: listView
        ...
        model: data

        delegate: rowComponent

    } // End of ListView id: listView

    Component {
        id: rowComponent

        Column {
            id: topRow

            RowElement {
                id: element1
                value: "value1"
            }

            RowElement {
                id: element2
                value: "value2"
            }

            RowElement {
                id: element3
                value: "value3"
            }
        }// End of Column id: topRow
    } // End of Component id: rowComponent }

-----------------------------------------------------
Thomas PABST
thomas.pabst at gmail.com
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