QVariantList/QVariantMap to QML ListModel

[volcano]

Hi,

I'm using an QAbstractItemModel to display data on a QML TreeView. I have a list of items for a particular column in the table.

I have saved those items in a QVariantList. Is it possible to display this on the UI as a ListView?

QVariant DiffModel::data(const QModelIndex &index, int role) const
{
	if (!index.isValid())
		return QVariant();
 
	DiffInfo* item = getItem(index);
 
	switch (role)
	{
	case ColumnRole:
		return item->rightColumn();//Return a QVariantList
	}
	return QVariant();
}

QVariant DiffModel::data(const QModelIndex &index, int role) const
{
	if (!index.isValid())
		return QVariant();

	DiffInfo* item = getItem(index);

	switch (role)
	{
	case ColumnRole:
		return item->rightColumn();//Return a QVariantList
	}
	return QVariant();
}

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Kindly advice

[anda_skoa]

A variant list is accessible as a JavaScript array on the QML side.

Cheers,
_

[volcano]

@anda_skoa thanks for ur reply

Could you provide me an example to access the qvariantlist in qml?

Is it possible to use qvariantlist in a qml list view?

[anda_skoa]

Could you provide me an example to access the qvariantlist in qml?

http://www.w3schools.com/js/js_arrays.asp

Is it possible to use qvariantlist in a qml list view?

Yes, just use it as the view's model.
Each delegate can access its respective entry as "model.modelData"

Cheers,
_

[volcano]

Thanks anda_skoa

If I use a qvariantmap, what role do I use for key and value?

Next problem I am facing is that, the items is the list view vary. As this list is displayed within a row of the table view, I require the each row to have variable height. Is it possible?

Kindly advice

[anda_skoa]

If I use a qvariantmap, what role do I use for key and value?

They key of the map is the role name in QML. I.e. you access the map like a JavaScript object

Next problem I am facing is that, the items is the list view vary. As this list is displayed within a row of the table view, I require the each row to have variable height. Is it possible?

Hmm, I haven't used TreeView myself yet, but I don't see why the item delegate couldn't have different height for different content.

Cheers,
_

[volcano]

Thanks anda_skoa

My qvariantmap has different keys for each item. I found a link http://doc.qt.io/qt-5/qtqml-cppinteg...ray-and-object which mentions how to use the qvariantmap using a for loop

However I am using this in a list view. So I am not sure what to specify for the key role and value role.

Regarding the variable height for each row, let's consider a table view. I am displaying 3 columns(one label, second a list view and third a list view) using tableviewcolumn. And each has its own delegate. So do i set the height in the itemdelegate ? Or is there a better way?

[anda_skoa]

TMy qvariantmap has different keys for each item.

Since you retrieve this from C++ it would be easier if you returned a list.

A map is only useful if you have more than one data aspect per item.

If you insist on using a less ideal data type, then you need to get the keys as a list to feed to the view's model property.
Inside the delegate you then use the current key as proivded by that list to do the data lookup.

Regarding the variable height for each row, let's consider a table view.

Originally you wrote TreeView, so you are using a TableView now?

I am displaying 3 columns(one label, second a list view and third a list view) using tableviewcolumn. And each has its own delegate. So do i set the height in the itemdelegate ? Or is there a better way?

Well, my first try would be to make the delegate as large as you want it to be.

Cheers,
_