Creating a keypress signal from application button

[maxmotor]

I get this error when trying to build:

error: 'QTableView& QTableView::operator=(const QTableView&)' is private

The header file of MyTableView looks like this:

@#include "qtableview.h"

class MyTableView: public QTableView {

Q_OBJECT;

public:
MyTableView(QWidget* parent = 0);
virtual ~MyTableView();
public slots:
void key_down();
void key_up();

};@

Do I need to change something here? Or does it look right?

[vsorokin]

First, not related with your problem things:

1. ';' not needed after Q_OBJECT - it's macros
2. 'virtual' keyword for destructor not needed in your class, because it's already defined as virtual in base class.

Second, your error:
Can you show line where error was happen?
For subclasses of QObject assignment operator and copy constructor always are private.

[maxmotor]

1. Okay - I'll correct that.
2. When I remove the virtual keyword I get a warning:

"Class "MyTableView" has virtual method 'qt_metacall' but non-virtual destructor"

3. I get the error in line 3 in the code showed in my previous post. I will add the code again, with the changes you mentioned.

@#include "qtableview.h"

class MyTableView: public QTableView {

Q_OBJECT

public:
MyTableView(QWidget* parent = 0);
~MyTableView();
public slots:
void key_down();
void key_up();

};@

Thank you for your time.

[vsorokin]

2. didn't you forget implement destructor body?
3. Ok, please, show code line where you create instance of MyTableView class or line where you use this instance as parameter of method

[ludde]

I think the build error probably has nothing to do with the definition of your MyTableView class, but rather how you use it. Maybe you are using an assignment with a MyTableView object somewhere, where you should really be assigning a pointer?

[maxmotor]

My setup.h file:

@#include "ui_setup.h"
#include "parent_ui.h"
#include "mytableview.h"

class Setup: public Parent_ui {
Q_OBJECT

public:
Setup(QWidget *parent = 0);
~Setup();
MyTableView myTableViewInstance;

private:
Ui::SetupClass ui;
void createActions();

private slots:
void up();
void down();
void enter();
void back();

};@

My setup.cpp file:

@#include "setup.h"
#include <QListWidget>

Setup::Setup(QWidget *parent) :
Parent_ui(parent) {

ui.setupUi(this);
Parent_ui::ui.headerLabel->setText("SETUP");

myTableViewInstance = new MyTableView();
}

Setup::~Setup() {

}
@

The error I get when calling "myTableViewInstance = new MyTableView();":

'QWidget' is an inaccessible base of 'MyTableView'

[ludde]

It's because you are assigning a pointer to an object. myTableViewInstance has to be a pointer.

[vsorokin]

ludde are right:
in your setup.h file
@
...
MyTableView *myTableViewInstance;
...
@

[maxmotor]

That was it, thank you :)

Okay to get back to the subject (Which I slowly turned away from introducing other challenges :) ).

I have made a slot in MyTableView:

@void MyTableView::key_down(){
QTableView::moveCursor(QAbstractItemView::MoveDown, Qt::NoModifier);
}@

This is then used in my setup.cpp file:

@void Setup::createActions() {

QObject::connect(ui.buttonTwo, SIGNAL(clicked()), this, SLOT(myTableViewInstance->key_down()));

}@

This has no effect on my QTableWidget though. But I guess it's me and my coding which is faulty again. Can you see from my code snippets what I'm doing wrong?

[vsorokin]

@ connect(ui.buttonTwo, SIGNAL(clicked()), myTableViewInstance, SLOT(key_down()));
@

[maxmotor]

I get this error: 'QObject' is an inaccessible base of 'MyTableView'

[vsorokin]

Please show MyTableView constructor implementation

[maxmotor]

It is empty :/

@MyTableView::MyTableView(QWidget* parent) : QTableView(parent){

}@

[vsorokin]

oh... I haven't more ideas :)

Try change
@#include "qtableview.h"@
to

@#include <QTableView>@

if nothing changes, just put all your sources to file hosting and get me link :)

[maxmotor]

I have sent you a link :)

[vsorokin]

Oh... many points:

1. In your sources
   @class MyTableView: private QTableView {@

although, in example above you wrote:
@class MyTableView: public QTableView {@

2. You don't needed MyTableView, you already have QTabletWidget on form
3. You don't needed inheritance in this case.
4. In setup.cpp
   I rewrite some things:
   It's for local slot, because MyTableView not needed anymore
   @connect(ui.buttonTwo, SIGNAL(clicked()), this, SLOT(down()));@

in slot, as example, you can add any checks and other logic to their:
@void Setup::down() {
Parent_ui::ui.tableWidget->selectRow(Parent_ui::ui.tableWidget->currentRow() + 1);
}@

same for up slot:
@void Setup::up() {
Parent_ui::ui.tableWidget->selectRow(Parent_ui::ui.tableWidget->currentRow() -1);

}@

[maxmotor]

Vass you are very kind!

I will have a look at this the first thing in the morning.

Especially you and ludde have been a big help so far dealing with my lack of Qt/C++ skills.

Thank you guys!

[maxmotor]

I just wanted to tell you that my code is now working as intended! - Thanks to you!

I'm very impressed of the willingness to help out on this forum. And the fast response was superb.

I'm almost positive that we will talk again! ;)

Thank you so much for your time!

[vsorokin]

[quote author="maxmotor" date="1316166090"]I just wanted to tell you that my code is now working as intended![/quote]

Glad to hear! :)
However, I highly recommend you learning C++ - it just save your time in future