Ben,
Item is of class Item
itemList model is of class QList<Item*>
Item has the property tags which is of type QStringList
Each item has ItemManager, the holder of itemList model, as parent
On toggleTag I’m doing this:
void DRCPatch::toggleTag(QString tag)
{
if (_tags.contains(tag))
_tags.removeOne(tag);
else
_tags.append(tag);
emit _manager->tagsChanged();
}
And in fact, the model is returned. I have confirmed that the model property
has been called. However, ListView doesn’t update or re-layout if the items are
exactly the same.
If here I do _tags.append(“something”) it will update and behave as expected.
QStringList ItemManager::tags()
{
return _tags;
}
Any ideas on how to work around this?
Regards,
Nuno
> On 28 Sep 2015, at 10:54, Ben Lau <xben...@gmail.com> wrote:
>
> How do you use the toggleTag? And what is the data type of element in
> itemList.model?
>
>
>
> On 28 September 2015 at 17:19, Nuno Santos <nunosan...@imaginando.pt
> <mailto:nunosan...@imaginando.pt>> wrote:
> Hi,
>
> I was trying to implement a tag cloud with a ListView but I'm facing some
> unexpected problems. My idea was the following:
>
> A ListView would have a model of tags, based on a QStringList. Other list
> view would have items (custom model), each item would have associated tags. I
> want to concentrate the tags in a single list in the UI. So, when you select
> an item, it will display all the tags, and the ones which are present in that
> item would get highlighted.
>
> Every time I click a tag, it will toggle that tag for the respective item.
> The problem is that for some reason, ListView seems to cache the data model
> and thus it doesn’t get redrawn. Because the tags are the exactly the same.
> What changed was item tags list.
>
> Is there anyway to bypass the model cache or force the ListView to redraw? I
> can’t find any suitable method on ListView documentation.
>
> I’m not finding an obvious solution for this problem and I believe that is a
> simple solution for it. Any ideas?
>
> ListView {
> id: tagsList
> model: tags
> delegate: Rectangle {
> color: "transparent"
> border.color: "white"
> border.width: 1
>
> Text {
> id: tagLabel
> color: "gray"
> text: "#"+modelData
> Component.onCompleted: {
> var tags = itemList.model[itemList.currentIndex].tags;
>
> for (var i=0;i<tags.length;i++)
> {
> if (tags[i]==modelData)
> color = "white"
> }
> }
> }
>
> MouseArea {
> anchors.fill: parent
> onClicked:
> itemList.model[itemList.currentIndex].toggleTag(modelData)
> }
> }
> }
>
> Thanks in advance,
>
> Regards,
>
> Nuno
>
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