Connect not working

[xgoan]

I'm working in a program that draws in a QPainter surface objects. I want to connect 2 scrollbars with translate() of QPainter and it isn't working.
Can you say me what i'm doing wrong?

Canvas.h file:

#pragma once
 
#include <QWidget>
#include <QPainter>
 
class Canvas:public QWidget{
    public:
        Canvas(QWidget *parent=0);
        ~Canvas();
    public slots:
        void translateX(int x);
        void translateY(int y);
    private:
        void paintEvent(QPaintEvent *);
 
        qreal trans_x,trans_y;
};
 
class wCanvas:public QWidget{
    public:
        wCanvas(QWidget *parent=0);
        ~wCanvas();
    private:
        Canvas *canvas;
};

#pragma once

#include <QWidget>
#include <QPainter>

class Canvas:public QWidget{
    public:
        Canvas(QWidget *parent=0);
        ~Canvas();
    public slots:
        void translateX(int x);
        void translateY(int y);
    private:
        void paintEvent(QPaintEvent *);
        
        qreal trans_x,trans_y;
};

class wCanvas:public QWidget{
    public:
        wCanvas(QWidget *parent=0);
        ~wCanvas();
    private:
        Canvas *canvas;
};

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Canvas.cpp file:

#include "Canvas.h"
 
#include <QGridLayout>
#include <QScrollBar>
 
// Implementación de Canvas
Canvas::Canvas(QWidget *parent):QWidget(parent),trans_x(0),trans_y(0){
    setPalette(QPalette(Qt::white));
    setAutoFillBackground(true);
}
 
Canvas::~Canvas(){
}
 
void Canvas::paintEvent(QPaintEvent *){
    QPainter painter(this);
 
    painter.translate(trans_x,trans_y);
    // Fondo transparente
    painter.setPen(Qt::lightGray);
    painter.setBrush(Qt::lightGray);
    painter.drawRect(0,0,width()/2-1,height()/2-1);
    painter.drawRect(width()/2,height()/2,width()/2,height()/2);
    // Fin fondo transparente
 
}
 
void Canvas::translateX(int x){
    trans_x+=x;
}
 
void Canvas::translateY(int y){
    trans_y+=y;
}
 
// Implementación de QCanvas
wCanvas::wCanvas(QWidget *parent):QWidget(parent){
    canvas=new Canvas;
    canvas->setMinimumSize(800,600);
    QScrollBar *hScrollBar=new QScrollBar(Qt::Horizontal);
    hScrollBar->setRange(-100,100);
    hScrollBar->setValue(0);
    QScrollBar *vScrollBar=new QScrollBar(Qt::Vertical);
    vScrollBar->setRange(-100,100);
    vScrollBar->setValue(0);
 
    connect(hScrollBar,SIGNAL(sliderMoved(int)),canvas,SLOT(translateX(int)));
    connect(vScrollBar,SIGNAL(sliderMoved(int)),canvas,SLOT(translateY(int)));
 
    QGridLayout *gridLayout=new QGridLayout;
    gridLayout->setMargin(0);
    gridLayout->setSpacing(0);
    gridLayout->addWidget(canvas,0,0);
    gridLayout->addWidget(vScrollBar,0,1);
    gridLayout->addWidget(hScrollBar,1,0);
    setLayout(gridLayout);
}
 
wCanvas::~wCanvas(){
    delete canvas;
}

#include "Canvas.h"

#include <QGridLayout>
#include <QScrollBar>

// Implementación de Canvas
Canvas::Canvas(QWidget *parent):QWidget(parent),trans_x(0),trans_y(0){
    setPalette(QPalette(Qt::white));
    setAutoFillBackground(true);
}

Canvas::~Canvas(){
}

void Canvas::paintEvent(QPaintEvent *){
    QPainter painter(this);

    painter.translate(trans_x,trans_y);
    // Fondo transparente
    painter.setPen(Qt::lightGray);
    painter.setBrush(Qt::lightGray);
    painter.drawRect(0,0,width()/2-1,height()/2-1);
    painter.drawRect(width()/2,height()/2,width()/2,height()/2);
    // Fin fondo transparente
    
}

void Canvas::translateX(int x){
    trans_x+=x;
}

void Canvas::translateY(int y){
    trans_y+=y;
}

// Implementación de QCanvas
wCanvas::wCanvas(QWidget *parent):QWidget(parent){
    canvas=new Canvas;
    canvas->setMinimumSize(800,600);
    QScrollBar *hScrollBar=new QScrollBar(Qt::Horizontal);
    hScrollBar->setRange(-100,100);
    hScrollBar->setValue(0);
    QScrollBar *vScrollBar=new QScrollBar(Qt::Vertical);
    vScrollBar->setRange(-100,100);
    vScrollBar->setValue(0);

    connect(hScrollBar,SIGNAL(sliderMoved(int)),canvas,SLOT(translateX(int)));
    connect(vScrollBar,SIGNAL(sliderMoved(int)),canvas,SLOT(translateY(int)));

    QGridLayout *gridLayout=new QGridLayout;
    gridLayout->setMargin(0);
    gridLayout->setSpacing(0);
    gridLayout->addWidget(canvas,0,0);
    gridLayout->addWidget(vScrollBar,0,1);
    gridLayout->addWidget(hScrollBar,1,0);
    setLayout(gridLayout);
}

wCanvas::~wCanvas(){
    delete canvas;
}

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Many thanks

[amulya]

u have to set "setSliderDown (true)"..this is responsible for sending the SliderMoved events

[xgoan]

With hScrollBar->setSliderDown(true) it's the same. I have tried valueChanged(int) too and nothing

[evgenM]

u forgot Q_OBJECT

[xgoan]

Ouch! Hehehe I thinked that Q_OBJECT is only needed when using signals in a class.

Thanks