I want to get the Min and Max values of QStandardItemModel.

[IknowQT]

appendRow to the value of QStandardItemModel.
I want to get the Min and Max values based on the column line.

Do I have to access the index every time to find Min and Max? Please let me know if there is a simpler way

[Christian Ehrlicher]

@IknowQT said in I want to get the Min and Max values of QStandardItemModel.:

Do I have to access the index every time to find Min and Max?

Yes

[JonB]

@IknowQT
There are 3 ways you can accomplish this:

1. Visit every index to determine the min/max in a column. This is presumably the way databases implement MIN/MAX(column), unless column has a database INDEX on it.

2. Add a QSortFilterProxyModel on top of the QStandardItemModel, sorted by the numeric desired column. Ensure dynamicSortFilter is on, so that it retains the correct, updated sort order when you add a row. Then you know you want the first and the last indexes into the sort filter proxy model.

3. Maintain your own min & max variables, presumably in a subclass of the QStandardItemModel. Initially calculate them by visiting every index. When you append a row you only need to compare that against your current min/max variables to see if they need updating. Be careful to clear them out and recalculate if you re-fill the model, change its other rows' values, or similar.