Is VBarModelMapper supposed to update the chart for me?
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I didn't find any search results for VBarModelMapper and HBarModelMapper on the forums, so this might be a tricky problem.
I'm using a QAbstractListModel-derived class to provide data to a QML ListView and Chart. Whenever I add data to my model, the ListView is updated correctly with the new rows. But when I use VBarModelMapper, the chart only shows the initial data, not the data I added later.
According to https://code.woboq.org/qt5/qtcharts/src/charts/barchart/qbarmodelmapper.cpp.html it looks like the VBarModelMapper handles the
rowsInsertedsignal, but my chart never changes on the screen.I made a simple version that shows my problem, it's on https://bitbucket.org/johnwoltman/chartmodelmappertest and a GIF of what I'm experiencing is at https://imgur.com/a/YKaY4
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Does anyone think I should file a bug report about this?
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Hi,
Isn't your beginInsertRows call wrong ? You start and end at the same point which looks strange. Note it's just from a cursory look, I haven't tested your code.
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I don't believe so, but I could be misreading the documentation. The way I think my code uses beginInsertRows is to insert a single row at the very end of the list.
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My bad, you're right. I remembered wrongly the documentation of the function (always better to double check...)
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I submitted a bug report, so maybe we'll hear back from the Qt team telling us if this is expected behaviour.
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Can you share the report link please ? That will make it easier to find.
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