QTableWidget problem

[wysota]

The former inherits the latter, thus the choice is yours. I'd go for QItemDelegate or even QStyledItemDelegate if you use a recent version of Qt.

[MarkoSan]

Will the result be as in first post?

P.S.:QStyledDelegate has no reference to known class, the link reports "object not found...".

[wysota]

Will the result be as in first post?

If you implement it correctly, then yes.

P.S.:QStyledDelegate has no reference to known class, the link reports "object not found...".

QStyledItemDelegate a Qt 4.4 class, so the reference won't be valid until 4.4.0 comes out.

[MarkoSan]

Ok, I try to set QTableWidget's item delegate using method setItemDelegate:

m_pShoppingCartTableWidget->setItemDelegate(m_pShoppingCartItemDelegate);    // sets delegate

m_pShoppingCartTableWidget->setItemDelegate(m_pShoppingCartItemDelegate);    // sets delegate

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In the last line of method, I get following error:

mingw32-make
mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory `C:/Documents and Settings/markofr/workspace/Client'
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_SQL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\..\..\Qt\4.3.4\include\QtCore" -I"..\..\..\..\Qt\4.3.4\include\QtCore" -I"..\..\..\..\Qt\4.3.4\include\QtGui" -I"..\..\..\..\Qt\4.3.4\include\QtGui" -I"..\..\..\..\Qt\4.3.4\include\QtSql" -I"..\..\..\..\Qt\4.3.4\include\QtSql" -I"..\..\..\..\Qt\4.3.4\include" -I"c:\Qt\4.3.4\include\ActiveQt" -I"debug" -I"." -I"..\..\..\..\Qt\4.3.4\mkspecs\win32-g++" -o debug\COperationWIndow.o COperationWIndow.cpp
COperationWIndow.cpp: In member function `void COperationWIndow::createShoppingCartTableWidget()' :
COperationWIndow.cpp:336: error: `QAbstractItemDelegate' is an inaccessible base of `CShoppingCartDelegate'
mingw32-make[1]: *** [debug/COperationWIndow.o] Error 1
mingw32-make[1]: Leaving directory `C:/Documents and Settings/markofr/workspace/Client'
mingw32-make: *** [debug] Error 2

Why I cannot set my own delegate??

[jacek]

Why I cannot set my own delegate??

Make sure you use public inheritance in CShoppingCartDelegate.

[MarkoSan]

So, wysota, I've finnaly setup the table view. It is blank rectangle with white background. Now, like your hint was telling me, I used QModelIndex (not subclassed). How do I notify now the model about data source, which is QList of:

typedef struct
{
    qint16 iMerchandizeID;
    QString strMerchandizeName;
    qreal rMerchandizePrice;
    qint16 iMerchandizeQuantity;
    qreal rSubtotal;
} structOrder;

typedef struct
{
    qint16 iMerchandizeID;
    QString strMerchandizeName;
    qreal rMerchandizePrice;
    qint16 iMerchandizeQuantity;
    qreal rSubtotal;
} structOrder;

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And I've setup the view with:

m_pShoppingCartTableView->setShowGrid(false);
    m_pShoppingCartTableView->setModel(m_pShoppingCartModel);
    m_pShoppingCartTableView->setItemDelegate(m_pShoppingCartItemDelegate);
    m_pShoppingCartTableView->horizontalHeader()->hide();
    m_pShoppingCartTableView->verticalHeader()->hide();
    m_pShoppingCartTableView->horizontalHeader()->setMinimumSectionSize(1);
    m_pShoppingCartTableView->verticalHeader()->setMinimumSectionSize(1);

m_pShoppingCartTableView->setShowGrid(false);
    m_pShoppingCartTableView->setModel(m_pShoppingCartModel);
    m_pShoppingCartTableView->setItemDelegate(m_pShoppingCartItemDelegate);
    m_pShoppingCartTableView->horizontalHeader()->hide();
    m_pShoppingCartTableView->verticalHeader()->hide();
    m_pShoppingCartTableView->horizontalHeader()->setMinimumSectionSize(1);
    m_pShoppingCartTableView->verticalHeader()->setMinimumSectionSize(1);

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I've copied this chunk of code from pixelator example and I've reused it. If i comment the first line, I still do not get grid (for instance). Does this mean view is not setup properly?

[wysota]

It means the model is not set up incorrectly.

[MarkoSan]

Ok, but how do I make model aware of its QList datasource?

[wysota]

If you don't feel confident in creating your own model, use QStandardItemModel and reimplement QStandardItem by adding your structure to it. I think the docs explain how to do this.

[MarkoSan]

Well, my friends, I've done that:

#ifndef CSHOPPINGCARTITEM_H_
#define CSHOPPINGCARTITEM_H_
 
#include <QStandardItem>
 
class CShoppingCartItem : public QStandardItem
{
    Q_OBJECT
 
public:
    CShoppingCartItem(QObject* parent=0);
};
 
#endif /*CSHOPPINGCARTITEM_H_*/

#ifndef CSHOPPINGCARTITEM_H_
#define CSHOPPINGCARTITEM_H_

#include <QStandardItem>

class CShoppingCartItem : public QStandardItem
{
    Q_OBJECT

public:
    CShoppingCartItem(QObject* parent=0);
};

#endif /*CSHOPPINGCARTITEM_H_*/

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and its .cpp companion:

#include "CShoppingCartItem.h"
 
CShoppingCartItem::CShoppingCartItem(QObject* parent)
    : QStandardItem()
{
}

#include "CShoppingCartItem.h"

CShoppingCartItem::CShoppingCartItem(QObject* parent)
    : QStandardItem()
{
}

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and I get these errors:

mingw32-make 
mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory `C:/Documents and Settings/markofr/workspace/Client'
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_SQL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\..\..\Qt\4.3.4\include\QtCore" -I"..\..\..\..\Qt\4.3.4\include\QtCore" -I"..\..\..\..\Qt\4.3.4\include\QtGui" -I"..\..\..\..\Qt\4.3.4\include\QtGui" -I"..\..\..\..\Qt\4.3.4\include\QtSql" -I"..\..\..\..\Qt\4.3.4\include\QtSql" -I"..\..\..\..\Qt\4.3.4\include" -I"c:\Qt\4.3.4\include\ActiveQt" -I"debug" -I"." -I"..\..\..\..\Qt\4.3.4\mkspecs\win32-g++" -o debug\moc_CShoppingCartItem.o debug\moc_CShoppingCartItem.cpp
debug\moc_CShoppingCartItem.cpp:37: error: `staticMetaObject' is not a member of `QStandardItem'
debug\moc_CShoppingCartItem.cpp: In member function `virtual void* CShoppingCartItem::qt_metacast(const char*)':
debug\moc_CShoppingCartItem.cpp:51: error: `qt_metacast' is not a member of `QStandardItem'
debug\moc_CShoppingCartItem.cpp: In member function `virtual int CShoppingCartItem::qt_metacall(QMetaObject::Call, int, void**)':
debug\moc_CShoppingCartItem.cpp:56: error: `qt_metacall' is not a member of `QStandardItem'
mingw32-make[1]: *** [debug/moc_CShoppingCartItem.o] Error 1
mingw32-make[1]: Leaving directory `C:/Documents and Settings/markofr/workspace/Client'
mingw32-make: *** [debug] Error 2

mingw32-make 
mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory `C:/Documents and Settings/markofr/workspace/Client'
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_SQL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\..\..\Qt\4.3.4\include\QtCore" -I"..\..\..\..\Qt\4.3.4\include\QtCore" -I"..\..\..\..\Qt\4.3.4\include\QtGui" -I"..\..\..\..\Qt\4.3.4\include\QtGui" -I"..\..\..\..\Qt\4.3.4\include\QtSql" -I"..\..\..\..\Qt\4.3.4\include\QtSql" -I"..\..\..\..\Qt\4.3.4\include" -I"c:\Qt\4.3.4\include\ActiveQt" -I"debug" -I"." -I"..\..\..\..\Qt\4.3.4\mkspecs\win32-g++" -o debug\moc_CShoppingCartItem.o debug\moc_CShoppingCartItem.cpp
debug\moc_CShoppingCartItem.cpp:37: error: `staticMetaObject' is not a member of `QStandardItem'
debug\moc_CShoppingCartItem.cpp: In member function `virtual void* CShoppingCartItem::qt_metacast(const char*)':
debug\moc_CShoppingCartItem.cpp:51: error: `qt_metacast' is not a member of `QStandardItem'
debug\moc_CShoppingCartItem.cpp: In member function `virtual int CShoppingCartItem::qt_metacall(QMetaObject::Call, int, void**)':
debug\moc_CShoppingCartItem.cpp:56: error: `qt_metacall' is not a member of `QStandardItem'
mingw32-make[1]: *** [debug/moc_CShoppingCartItem.o] Error 1
mingw32-make[1]: Leaving directory `C:/Documents and Settings/markofr/workspace/Client'
mingw32-make: *** [debug] Error 2

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What am I doing wrong?

[wysota]

QStandardItem is not a QObject.

[MarkoSan]

If you don't feel confident in creating your own model, use QStandardItemModel and reimplement QStandardItem by adding your structure to it. I think the docs explain how to do this.

I've been searching docs and two books regarind adding custom structore to QStandardItem, however, I did not find it. I do not know how to continue, please help ... Does anyone has example?

[wysota]

QStandardItem docs, section "Subclassing".

[MarkoSan]

I've read it, wysota, but I still do not know how to integrate my struct into subclassed QStandardItem. Here is what I've done so far (it is very little), I really would need some deeper help. The header:

#ifndef CSHOPPINGCARTITEM_H_
#define CSHOPPINGCARTITEM_H_
 
// qt includes
#include <QStandardItem>
 
static const int STRUCT_ORDER_TYPE=1001;
 
class CShoppingCartItem : public QStandardItem
{
public:
    CShoppingCartItem(QObject* parent=0);
 
    int type() const;
};
 
#endif /*CSHOPPINGCARTITEM_H_*/

#ifndef CSHOPPINGCARTITEM_H_
#define CSHOPPINGCARTITEM_H_

// qt includes
#include <QStandardItem>

static const int STRUCT_ORDER_TYPE=1001;

class CShoppingCartItem : public QStandardItem
{
public:
    CShoppingCartItem(QObject* parent=0);
    
    int type() const;
};

#endif /*CSHOPPINGCARTITEM_H_*/

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Implementation:

#include "CShoppingCartItem.h"
 
CShoppingCartItem::CShoppingCartItem(QObject* parent)
    : QStandardItem()
{
}
 
int CShoppingCartItem::type() const
{
    return STRUCT_ORDER_TYPE;
}

#include "CShoppingCartItem.h"

CShoppingCartItem::CShoppingCartItem(QObject* parent)
    : QStandardItem()
{
}

int CShoppingCartItem::type() const
{
    return STRUCT_ORDER_TYPE;
}

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Where do I put my struct?!

[wysota]

Either as a member variable or as a superclass. Either way you'll have to reimplement other methods mentioned in the docs if you want to use the structure for anything. But before you do, think if you do need the structure at all. You might use QStandardItem without subclassing - just use custom roles and set your data.

[MarkoSan]

How do I use custom roles? I've been reading docs but I still do not see the way how to do this task.

[wysota]

Role is simply a number. Just use setData() and data() with a number of your choice but not less than Qt::UserRole. I think the docs are quite clear about it. You can also take a look at the wiki article about [wiki=QAbstractItemModel]models[/wiki].

[MarkoSan]

Well, I've reimplemented QAbstractTableModel and QTableView, it works ok. The last step is to reimplement QStandardItem for delegate get to work. But right now I am confused regarding layouts. In the attachemnt there is a GUI of my application module. Well, widgets named "QPUSHBUTTON1" and "QTABLEVIEW" are connected via QVBoxLayout. This vertical layout resided with main operation's window (wich is also vertical layouted with 3 pushbuttons placed under it - the 3 pushbuttons are horiz. layouted) vertical layout in horizontal layout. Now, the layout of QPUSHBUTTON1 and QTABLEVIEW is too wide. Now, how can I make main operation window wider and QPUSHBUTTON1 with QTABLEVIEW narrower. Do I have to begin experiment with layouts or the widgets inside "actor" layouts?

[wysota]

You can adjust horizontal stretches and/or size policies of widgets.

[MarkoSan]

Well, I used resize function, but there are no results ...