I can't move my slider. Heelp

[Krystian]

I'm learning qt anc c++ and recently i wrote this using clock example. Everything is ok except i can't move slider using mouse, keyboard arrows works. What's wrong? :

main.cpp isn't modified


mainwindow.h:

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QLabel>
#include <QTimer>
#include <QSlider>
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    QSlider *slider;
    QLabel *tekst;
    QTimer *timer;
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
public slots:
 void updated();
 void paintEvent(QPaintEvent *event);
 void predkosc(int a);
 
private:
 
    Ui::MainWindow *ui;
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QLabel>
#include <QTimer>
#include <QSlider>
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    QSlider *slider;
    QLabel *tekst;
    QTimer *timer;
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
public slots:
 void updated();
 void paintEvent(QPaintEvent *event);
 void predkosc(int a);

private:

    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

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mainwindow.cpp:

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QPainter>
int lol=0;
int v=1;
float ha;
void MainWindow::predkosc(int a){
    timer->start(15-a);
}
void MainWindow::updated(){
    ha=lol/60.00;
    tekst->setText(QString::number(lol/360));
    lol++;
    if (lol==21600)
        lol=0;
    update();
}
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{   this->setFixedSize(500,800);
    timer = new QTimer(this);
    slider= new QSlider(Qt::Horizontal, this);
    slider->setValue(3);
    slider->setMaximum (15);
    slider->setMinimum (1);
    slider->setGeometry(QRect((width()/2)-100, (height()*8/9), 200, 50));
    tekst = new QLabel(this);
    tekst->setStyleSheet("font: 38pt;");
    tekst->setGeometry(QRect((width()/2)-10, (height()*7/9), 80, 80));
    connect(timer, SIGNAL(timeout()), this, SLOT(updated()));
    connect(slider, SIGNAL(valueChanged(int)), this, SLOT(predkosc(int)));
    predkosc(3);
    ui->setupUi(this);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
 
 
void MainWindow::paintEvent(QPaintEvent *){
    QPainter painter(this);
    static const QPoint hourHand[3] = {
        QPoint(4, 4),
        QPoint(-4, 4),
        QPoint(0, -40)
    };
    static const QPoint minuteHand[3] = {
        QPoint(4, 4),
        QPoint(-4, 4),
        QPoint(0, -90)
    };
 
    QColor hourColor(127, 0, 127);
    QColor minuteColor(0, 127, 127, 191);
    int side = qMin(width(), height());
    painter.setRenderHint(QPainter::Antialiasing);
    painter.translate(width() / 2, height() / 2);
    painter.scale(side / 200.0, side / 200.0);
    painter.setPen(Qt::NoPen);
    painter.setBrush(hourColor);
    painter.rotate(ha);
    painter.drawConvexPolygon(hourHand, 3);
    painter.setBrush(minuteColor);
    painter.rotate(lol);
    painter.drawConvexPolygon(minuteHand, 3);
 
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QPainter>
int lol=0;
int v=1;
float ha;
void MainWindow::predkosc(int a){
    timer->start(15-a);
}
void MainWindow::updated(){
    ha=lol/60.00;
    tekst->setText(QString::number(lol/360));
    lol++;
    if (lol==21600)
        lol=0;
    update();
}
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{   this->setFixedSize(500,800);
    timer = new QTimer(this);
    slider= new QSlider(Qt::Horizontal, this);
    slider->setValue(3);
    slider->setMaximum (15);
    slider->setMinimum (1);
    slider->setGeometry(QRect((width()/2)-100, (height()*8/9), 200, 50));
    tekst = new QLabel(this);
    tekst->setStyleSheet("font: 38pt;");
    tekst->setGeometry(QRect((width()/2)-10, (height()*7/9), 80, 80));
    connect(timer, SIGNAL(timeout()), this, SLOT(updated()));
    connect(slider, SIGNAL(valueChanged(int)), this, SLOT(predkosc(int)));
    predkosc(3);
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}



void MainWindow::paintEvent(QPaintEvent *){
    QPainter painter(this);
    static const QPoint hourHand[3] = {
        QPoint(4, 4),
        QPoint(-4, 4),
        QPoint(0, -40)
    };
    static const QPoint minuteHand[3] = {
        QPoint(4, 4),
        QPoint(-4, 4),
        QPoint(0, -90)
    };

    QColor hourColor(127, 0, 127);
    QColor minuteColor(0, 127, 127, 191);
    int side = qMin(width(), height());
    painter.setRenderHint(QPainter::Antialiasing);
    painter.translate(width() / 2, height() / 2);
    painter.scale(side / 200.0, side / 200.0);
    painter.setPen(Qt::NoPen);
    painter.setBrush(hourColor);
    painter.rotate(ha);
    painter.drawConvexPolygon(hourHand, 3);
    painter.setBrush(minuteColor);
    painter.rotate(lol);
    painter.drawConvexPolygon(minuteHand, 3);

}

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[myta212]

Hi,
What do you mean by can can't move slider ? are your program freeze ?
QMainWindow have update() method too. How about you cange your timer slot?

Best regards,

myta

[Krystian]

Without update() the clock won't move.
When i'm trying to move the slider using mouse nothing happens, no freeze etc. Like this slider is covered by something invisible therefore unclickable. I can still move the slider using keyboard arrows.

[wysota]

Use layouts to manage your ui instead of manual calls to setGeometry().

[myta212]

Hi,
The problem is you set the "initial mainWindow design" at top of your slider design. Please move location of

ui->setupUi(this);

ui->setupUi(this);

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at top of your constructor mainWindow. So, your constructor is like this :

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->setFixedSize(500,800);
    timer = new QTimer(this);
    slider= new QSlider(Qt::Horizontal, this);
    slider->setValue(3);
    slider->setMaximum (15);
    slider->setMinimum (1);
    slider->setGeometry(QRect((width()/2)-100, (height()*8/9), 200, 50));
    tekst = new QLabel(this);
    tekst->setStyleSheet("font: 38pt;");
    tekst->setGeometry(QRect((width()/2)-10, (height()*7/9), 80, 80));
    connect(timer, SIGNAL(timeout()), this, SLOT(updated()));
    connect(slider, SIGNAL(valueChanged(int)), this, SLOT(predkosc(int)));
    predkosc(3);
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->setFixedSize(500,800);
    timer = new QTimer(this);
    slider= new QSlider(Qt::Horizontal, this);
    slider->setValue(3);
    slider->setMaximum (15);
    slider->setMinimum (1);
    slider->setGeometry(QRect((width()/2)-100, (height()*8/9), 200, 50));
    tekst = new QLabel(this);
    tekst->setStyleSheet("font: 38pt;");
    tekst->setGeometry(QRect((width()/2)-10, (height()*7/9), 80, 80));
    connect(timer, SIGNAL(timeout()), this, SLOT(updated()));
    connect(slider, SIGNAL(valueChanged(int)), this, SLOT(predkosc(int)));
    predkosc(3);
}

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Best regards,

Toto

[Krystian]

It works, thanks!