QTableWidget case sensitive sort

[Raccoon29]

Hi all,
I have to sort a QTableWidget, and I achieve this with QTableView::setSortingEnabled(bool); but this sorting seems to be case sensitive, so the table is ordered in this way:
a....zA.....Z and so on.

Is there a way to make it NOT case sensitive? Maybe a flag or something like that...

[wysota]

Yes, reimplement operator< in QTableWidgetItem.

[Raccoon29]

Yes, reimplement operator< in QTableWidgetItem.

Thank you, brilliant idea

[Raccoon29]

oops... where should I overload it?
Have I to inherit from QTableWidget and replace the existing table (i'm using QtDesigner)?

[wysota]

No, you have to subclass QTableWidgetItem, reimplement the operator and use your subclass instead of QTableWidgetItem.

[Raccoon29]

No, you have to subclass QTableWidgetItem, reimplement the operator and use your subclass instead of QTableWidgetItem.

Ok, you are right.
Thank you again

[Raccoon29]

Ahi, my custom items seem to be ignored...
Here is some code:
CTableWidgetItem.h

#include <QtGui>
 
/** Subclass definition **/
class CTableWidgetItem: public QTableWidgetItem
{
	public:
		CTableWidgetItem();
		bool operator<(const CTableWidgetItem &item);
};

#include <QtGui>

/** Subclass definition **/
class CTableWidgetItem: public QTableWidgetItem
{
	public:
		CTableWidgetItem();
		bool operator<(const CTableWidgetItem &item);
};

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CTableWidgetItem.cpp

#include "CTableWidgetItem.h"
 
CTableWidgetItem::CTableWidgetItem()
{
}
 
bool CTableWidgetItem::operator<(const CTableWidgetItem &item)
{
	if(text().toUpper()<item.text().toUpper())
		return true;
	else
		return false;
}

#include "CTableWidgetItem.h"

CTableWidgetItem::CTableWidgetItem()
{
}

bool CTableWidgetItem::operator<(const CTableWidgetItem &item)
{
	if(text().toUpper()<item.text().toUpper())
		return true;
	else
		return false;
}

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then I used my CTableWidgetItem instead of QTableWidgetItem in the table, like this:

QString id;
int row=0;
...
CTableWidgetItem *idvar=new CTableWidgetItem;
idvar->setText(id);
ui.tbwvariations->setItem(row,0,idvar); //tbwvariations is a GUI QTableWidget

QString id;
int row=0;
...
CTableWidgetItem *idvar=new CTableWidgetItem;
idvar->setText(id);
ui.tbwvariations->setItem(row,0,idvar); //tbwvariations is a GUI QTableWidget

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when I click the table's headbar they get sorted case insensitive like always.
I tried a MessageBox in the operator method, but it get no ever called, so application never passes through it.
What is the mistake...?

[wysota]

You have to reimplement the existing operator< (the one that takes QTableWidgetItem), not implement yours that takes your item.

[jpn]

Also, notice the constness of the method.

[Raccoon29]

...right... now it works...

what a stupid mistake... Bjarne Stroustrup would hurt me...
Well, thank you both for the Nth time

[jay]

the above posts in this thread helped me to do sorting in case sensitive manner.
Thanks for this.

If an item contains both text and an icon,
is there any way to do sorting based on icon and also the text?
(In my application, i am displaying system files and folders. so i need to sort folders first, then files)

can anyone help me to do this.

I am using Qt4.4.0 in windows

[wysota]

The contents of the comparison operator is totally up to you, so you can sort based on any criteria you choose. In your case you need a mechanism to decide which icon is "smaller".