Reimplementation of QAbstractItemModel::setData

Zoptune

Hi,

I have a QTableView that display the content of a QSqlQueryModel. But now i need to merge some rows.
I decided to merge the content of the rows but i can't modify the QSqlQueryModel.

I use a custom QSortFilterProxyModel.
But I don't know how to reimplement the setData function. I also need to reimplement the data function to get the content to merge.

Thx

VRonin

@Zoptune said in Reimplementation of QAbstractItemModel::setData:

merge some rows

error C2065: 'merge some rows' : undeclared identifier

Please define what you mean

Zoptune

Hi @VRonin ,

I have rows in my TableView that represent real objects. Special objects can be created in pair. This is why i want to merge rows.
These special object have the same name but not the same length.

Example :
At the begining i have two row with name XXXXX and length 5m and 10m.
At the end, i want to have one row with name XXXXX and length 5m + 10m.

I hope I was clear in my explanations.

Thx

VRonin

Would you like the data in your original model to be kept separate or merged?

Are name and length 2 different columns?

Zoptune

@VRonin

I don't care if the data is merged or not in the original model and yes name and length are separated columns.

VRonin

Last question, I promise: does the model need to editable?

Zoptune

@VRonin

If you ask me if the user can edit the model, the answer is no. I just want to display the data but i need to merge some of them before.

VRonin

implemented here: http://pastebin.com/K3Xmquyz

example usage:

#include <QApplication>
#include <QStandardItemModel>
#include <QTableView>
#include <QHBoxLayout>
#include "mergeproxy.h"
int main(int argc, char **argv)
{

    QApplication app(argc,argv);
    QStandardItemModel baseModel;
    baseModel.insertRows(0, 5);
    baseModel.insertColumns(0, 2);
    baseModel.setHeaderData(0, Qt::Horizontal, "Col1");
    baseModel.setHeaderData(1, Qt::Horizontal, "Col2");
    baseModel.setData(baseModel.index(0, 0), "Test");
    baseModel.setData(baseModel.index(0, 1), 1);
    baseModel.setData(baseModel.index(1, 0), "Test");
    baseModel.setData(baseModel.index(1, 1), 2);
    baseModel.setData(baseModel.index(2, 0), "Test2");
    baseModel.setData(baseModel.index(2, 1), 3);
    baseModel.setData(baseModel.index(3, 0), "Test2");
    baseModel.setData(baseModel.index(3, 1), 4);
    baseModel.setData(baseModel.index(4, 0), "Alone");
    baseModel.setData(baseModel.index(4, 1), 100);

    MergeProxy baseProxy;
    baseProxy.setSourceModel(&baseModel);
    baseProxy.setMergeKeyColumn(0);

    QWidget mainWidget;
    QTableView* savedView=new QTableView(&mainWidget);
    savedView->setModel(&baseModel);
    QTableView* loadedView=new QTableView(&mainWidget);
    loadedView->setModel(&baseProxy);
    QHBoxLayout* mainLay = new QHBoxLayout(&mainWidget);
    mainLay->addWidget(savedView);
    mainLay->addWidget(loadedView);
    mainWidget.show();
    return app.exec();
}

Zoptune

@VRonin

Wow there's a lot of things i don't understand or that i have never used ^^

Thank you very much it seems to be what i want !
I need to work and understand now :)

Zoptune

@VRonin

Hi, it's me again.

I not sure i understood, in what function do you change the data ?

From what I understood, this is the MergeProxy::data function that edit the data.

Because now i'm working with a bigger table and more complex treatment.

I need to merge rows using two mergeKeyColumn.

Example :

alt text

Here the two last columns are the two mergeKeyColumn (first one is "pair_id" and second one is "id")
And "AKSA" from row 2 col 3 need to go at col 4.

Result :
alt text

Thx

Zoptune

Please i need help ^^

VRonin

What you need is 100% data dependant, there is no way of implementing it in a general way.
You are better off just executing the query manually and fill a QStandardItemModel manually meging the cells when necessary instead of using QSqlQueryModel

Zoptune

Ok, i thought was an another way to merge rows.

Thank you