QTableView sorting when using a model

[steg90]

Hi,

Having to do some modifications to some code someone did well over 10 months ago. Part of this is to sort some data in ascending order within a QTableView. Now I noticed it uses a model ( QAbstractTableModel ). The data seems to be stored within a QList. The objects that are stored in this QList are of the following :

class ASignal 
	{
	public:
		ASignal() { }
		char name[256];
		char unit[256];
		char strECU[20];
		double dmaximum;
		double dminimum;
		double dfactor;
		double doffset;
		UINT istartbit;
		UINT ilength;
		double realvalue;
		long rawvalue;
		double byteorder;
	};

class ASignal 
	{
	public:
		ASignal() { }
		char name[256];
		char unit[256];
		char strECU[20];
		double dmaximum;
		double dminimum;
		double dfactor;
		double doffset;
		UINT istartbit;
		UINT ilength;
		double realvalue;
		long rawvalue;
		double byteorder;
	};

To copy to clipboard, switch view to plain text mode 

I want to sort this QList<ASignal*> on the member name. What is the best and quickest way of achieving this? Before the data is inserted into the QList should I do some checking and use swap etc?

Kind regards,
Steve

[jacek]

Use the three parameter version of qSort from QtAlgorithms.

[Conel]

I would suggest not sorting data in model if you need only to display sorted data in QTableView.

There is another good solution: use QSortFilterProxyModel as a proxy between your model and QTableView. If you want to have some specific sorting then you only need to re-implement one virtual method

bool QSortFilterProxyModel::lessThan

But in most case its default implementation will be enough (see Qt help & examples on QSortFilterProxyModel)