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connect(left,SIGNAL(clicked()),this,SLOT(previousWeek()));

public slots:
    void previousWeek();
    void nextWeek();

#include "week2.h"
#include"QDate"
#include"QDebug"

week2::week2(QWidget *parent)
: QWidget(parent)
{
    width=100;
    numberOfWeek=0;
    setGeometry(0,0,700,30);
    setMaximumWidth(2000);
    left=new QPushButton(this);
    left->setGeometry(0,0,10,30);
    connect(left,SIGNAL(clicked()),this,SLOT(previousWeek()));
    right=new QPushButton(this);
    connect(right,SIGNAL(clicked()),this,SLOT(nextWeek()));
}

week2::~week2(){
    delete left;
    }

void week2::paintEvent(QPaintEvent *){
        QStylePainter p(this);
        QDate date;
        int dayOfWeek=date.currentDate().dayOfWeek();
        QStyleOptionButton monday,tuesday,wednesday,thursday,friday,saturday,sunday;

        monday.initFrom(this);
        monday.state=QStyle::State_Raised | QStyle::State_Enabled;
        monday.rect=QRect(10,0,width-10,30);
        monday.text=(date.currentDate().addDays(1-dayOfWeek+numberOfWeek).toString());

        tuesday.initFrom(this);
        tuesday.state=QStyle::State_Raised | QStyle::State_Enabled;
        tuesday.rect=QRect(width,0,width,30);
        tuesday.text=(date.currentDate().addDays(2-dayOfWeek+numberOfWeek).toString());

        wednesday.initFrom(this);
        wednesday.state=QStyle::State_Raised | QStyle::State_Enabled;
        wednesday.rect=QRect(width*2,0,width,30);
        wednesday.text=(date.currentDate().addDays(3-dayOfWeek+numberOfWeek).toString());

        thursday.initFrom(this);
        thursday.state=QStyle::State_Raised | QStyle::State_Enabled;
        thursday.rect=QRect(width*3,0,width,30);
        thursday.text=(date.currentDate().addDays(4-dayOfWeek+numberOfWeek).toString());

        friday.initFrom(this);
        friday.state=QStyle::State_Raised | QStyle::State_Enabled;
        friday.rect=QRect(width*4,0,width,30);
        friday.text=(date.currentDate().addDays(5-dayOfWeek+numberOfWeek).toString());

        saturday.initFrom(this);
        saturday.state=QStyle::State_Raised | QStyle::State_Enabled;
        saturday.rect=QRect(width*5,0,width,30);
        saturday.text=(date.currentDate().addDays(6-dayOfWeek+numberOfWeek).toString());

        sunday.initFrom(this);
        sunday.state=QStyle::State_Raised | QStyle::State_Enabled;
        sunday.rect=QRect(width*6,0,width-10,30);
        sunday.text=(date.currentDate().addDays(7-dayOfWeek+numberOfWeek).toString());
        right->setGeometry(width*7-10,0,10,30);
        p.drawControl(QStyle::CE_PushButton,monday);
        p.drawControl(QStyle::CE_PushButton,tuesday);
        p.drawControl(QStyle::CE_PushButton,wednesday);
        p.drawControl(QStyle::CE_PushButton,thursday);
        p.drawControl(QStyle::CE_PushButton,friday);
        p.drawControl(QStyle::CE_PushButton,saturday);
        p.drawControl(QStyle::CE_PushButton,sunday);

}

void week2::nextWeek(){
    numberOfWeek+=7;
    qDebug()<<numberOfWeek;
    update();
}
void week2::previousWeek(){
    numberOfWeek-=7;
    qDebug()<<numberOfWeek;
    update();
}

void week2::resize(int w){
    width=w;
    update();
}