Error signal connection between 2 classes

[jpn]

I'd say, don't waste your time replicating the DOM tree structure to QTreeWidgetItems. Rather, use the model-view approach and wrap the existing DOM tree to a QAbstractItemModel.

PS. There's an example available: Simple DOM Model.

PPS. The solution to your signal-slot connection problem is to refactor

void DomParser(const QString *fileName);

void DomParser(const QString *fileName);

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as

void DomParser(const QString &fileName);

void DomParser(const QString &fileName);

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[mattia]

I got it, but i have some problems to understand what's the parent id and what's its functions.
For example if I have created a layout wiht QT Designer and i want to implement other function i have to include the ui_class.h into my class.h, i'll add some functions into class.h and i'll implement them in class.cpp.
Now i want to modify, for example a Widget, that is declared in ui_class.h but to do this i want to create another class just to handling the data into the Widget, what have i to do to have a riferiment at the elements in ui_class.h?
I hope you understant it cos i know that my english isn't so good

[jpn]

I got it, but i have some problems to understand what's the parent id and what's its functions.

I'm sorry, what parent id are you talking about?

For example if I have created a layout wiht QT Designer and i want to implement other function i have to include the ui_class.h into my class.h, i'll add some functions into class.h and i'll implement them in class.cpp.

Correct.

Now i want to modify, for example a Widget, that is declared in ui_class.h but to do this i want to create another class just to handling the data into the Widget, what have i to do to have a riferiment at the elements in ui_class.h?

Yes, you might want to implement the model in separate files. In this case you would place a QTreeView on the form in Qt Designer. Then, in class.cpp you would a) include model.h (or whatever it's called), b) create an instance of the model, and c) anywhere after calling setupUi() (which creates the treeview) you would set the model to the treeview with QAbstractItemView::setModel().

// class.cpp
#include "class.h"
#include "model.h" // <-- a
 
Class::Class(QWidget* parent) : QWidget(parent)
{
    ui.setupUi(this);
 
    Model* model = new Model(ui.treeView); // <-- b
    ui.treeView->setModel(model); // <-- c
}

// class.cpp
#include "class.h"
#include "model.h" // <-- a

Class::Class(QWidget* parent) : QWidget(parent)
{
    ui.setupUi(this);
    
    Model* model = new Model(ui.treeView); // <-- b
    ui.treeView->setModel(model); // <-- c
}

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I hope you understant it cos i know that my english isn't so good

It's ok. Mine is not that good either..

[mattia]

Ok, thanks so much for your suggestion, I made as you told me and if I pass a Widget to another class i can modify it.
But what's happen if i want to pass to another class a pointer to QMainWindow to have acces at all the interface members(I mean the ui_class Widget put with QT Designer).
Down here the code.
In ui_guiwid.h I just added a QLabel labelPark and an menù action actionChangeLabel.
On doSmt.cpp the main error.
Thanks

guiwid.h

#include <QtGui/QWidget>
#include "ui_guiwid.h"
 
class guiwid : public QMainWindow
{
    Q_OBJECT
 
public:
    guiwid();
    ~guiwid();
private slots:
	void callDoStm();
private:
    Ui::MainWindow ui;
};

#include <QtGui/QWidget>
#include "ui_guiwid.h"

class guiwid : public QMainWindow
{
    Q_OBJECT

public:
    guiwid();
    ~guiwid();
private slots:
	void callDoStm();
private:
    Ui::MainWindow ui;
};

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guiwid.cpp

#include "guiwid.h"
#include "doSmt.h"
#include <QtGui/QWidget>
 
guiwid::guiwid()
{
	ui.setupUi(this);
	connect(ui.actionChangeLabel, SIGNAL(triggered()), this, SLOT(callDoStm()));
}
 
guiwid::~guiwid()
{
 
}
 
void guiwid::callDoStm(){
	doSmt *ds = new doSmt(ui.MainWindow);
	ds->changeLabel();
}

#include "guiwid.h"
#include "doSmt.h"
#include <QtGui/QWidget>

guiwid::guiwid()
{
	ui.setupUi(this);
	connect(ui.actionChangeLabel, SIGNAL(triggered()), this, SLOT(callDoStm()));
}

guiwid::~guiwid()
{

}

void guiwid::callDoStm(){
	doSmt *ds = new doSmt(ui.MainWindow);
	ds->changeLabel();
}

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doSmt.h

#include <QtGui/QWidget>
#include <QMainWindow>
 
class doSmt 
{
public:
    doSmt(QMainWindow *mainWindow);
    ~doSmt(); 	
public:
	void changeLabel();
	QMainWindow *mainWindow;
};

#include <QtGui/QWidget>
#include <QMainWindow>

class doSmt 
{
public:
    doSmt(QMainWindow *mainWindow);
    ~doSmt(); 	
public:
	void changeLabel();
	QMainWindow *mainWindow;
};

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doSmt.cpp

#include "doSmt.h"
#include <QtGui/QWidget>
#include <QLabel>
 
doSmt::doSmt(QMainWindow *mainWindow)
{
	this->mainWindow = mainWindow;
}
 
doSmt::~doSmt()
{
 
}
 
void doSmt::changeLabel()
{
	mainWindow->labelPark->setText("Yeap!"); //I can't access on this member
}

#include "doSmt.h"
#include <QtGui/QWidget>
#include <QLabel>

doSmt::doSmt(QMainWindow *mainWindow)
{
	this->mainWindow = mainWindow;
}

doSmt::~doSmt()
{

}

void doSmt::changeLabel()
{
	mainWindow->labelPark->setText("Yeap!"); //I can't access on this member
}

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[jpn]

Well, to be honest, I think that's quite bad design. Contents of "Ui::MainWindow ui" is private part of "guiwid". Nobody else should be able to access them, really. Rather, "guiwid" should provide an interface to allow needed tasks to be done. Thanks to Qt's signals and slots, you could even keep "doSmt" unware of "guiwid". "doSmt" could for example just emit a signal which is connected to a slot in "guiwid".

[mattia]

Ok, i got it. Thanks so much again, now i know something more about how to design class on QT.