Sort QTreeView on multiple columns

[AntriX]

Hi,

I Have a tree view which contains data in table format like:
Col1 Col2 Col3 Col4 ...
H1
B C D
E F G
H2
H I J
K L M

I want to sort tree data based on multiple columns. Lets say on col1 and col2.
I am using QSortFilterProxyModel to sort. I have implemented my own lessThan to sort as per my requirements.
I have tried sorting like:
m_TreeView->sortByColumn(1, Qt::AscendingOrder);
m_TreeView->sortByColumn(0, Qt::AscendingOrder);
so that col2 will be sorted followed by col1 but it didn't worked.
Can Anyone please suggest right approach to implement this?

[AntriX]

@AntriX said in Sort QTreeView on multiple columns:

Col1 Col2 Col3 Col4 ...
H1
B C D
E F G
H2
H I J
K L M

Col1       Col2     Col3     Col4 
 H1
            B        C         D
            E        F         G
 H2
            H        I         J
            K        L         M

Tree structure looks like one shown above.

[JonB]

@AntriX said in Sort QTreeView on multiple columns:

but it didn't worked.

What happened?

sortByColumn() will only sort by one column. You cannot call it multiple times to produce sort by multiple columns. You have to implement that logic yourself (via your lessThan() taking into account secondary columns).

[AntriX]

@JonB @JonB Thank you. Yes I was also thinking to implement it through lessThan function.
I can sort columns by clicking on column header.
Can you please guide how can I always sort column1 first and then sort the clicked column accordingly or vice-versa. Please share if you have any refrence code.

[JonB]

@AntriX
You need to design your own way for the user to tell you that they want such-and-such column as the secondary sort column. Then in your lessThan() if 2 values compare equal on the primary column look up the values in the secondary column and compare those to determine what it should return when the primary columns are equal.

[AntriX]

@JonB Thank you. I have done by sorting the data while filling the model which is meeting my requirement.