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:
Qt Code: 
  1. #ifndef MAINWINDOW_H
  2. #define MAINWINDOW_H
  3.  
  4. #include <QMainWindow>
  5. #include <QLabel>
  6. #include <QTimer>
  7. #include <QSlider>
  8. namespace Ui {
  9. class MainWindow;
  10. }
  11.  
  12. class MainWindow : public QMainWindow
  13. {
  14.     Q_OBJECT
  15.  
  16. public:
  17.     QSlider *slider;
  18.     QLabel *tekst;
  19.     QTimer *timer;
  20.     explicit MainWindow(QWidget *parent = 0);
  21.     ~MainWindow();
  22. public slots:
  23.  void updated();
  24.  void paintEvent(QPaintEvent *event);
  25.  void predkosc(int a);
  26.  
  27. private:
  28.  
  29.     Ui::MainWindow *ui;
  30. };
  31.  
  32. #endif // MAINWINDOW_H
To copy to clipboard, switch view to plain text mode 


mainwindow.cpp:
Qt Code: 
  1. #include "mainwindow.h"
  2. #include "ui_mainwindow.h"
  3. #include <QPainter>
  4. int lol=0;
  5. int v=1;
  6. float ha;
  7. void MainWindow::predkosc(int a){
  8.     timer->start(15-a);
  9. }
  10. void MainWindow::updated(){
  11.     ha=lol/60.00;
  12.     tekst->setText(QString::number(lol/360));
  13.     lol++;
  14.     if (lol==21600)
  15.         lol=0;
  16.     update();
  17. }
  18. MainWindow::MainWindow(QWidget *parent) :
  19.     QMainWindow(parent),
  20.     ui(new Ui::MainWindow)
  21. {   this->setFixedSize(500,800);
  22.     timer = new QTimer(this);
  23.     slider= new QSlider(Qt::Horizontal, this);
  24.     slider->setValue(3);
  25.     slider->setMaximum (15);
  26.     slider->setMinimum (1);
  27.     slider->setGeometry(QRect((width()/2)-100, (height()*8/9), 200, 50));
  28.     tekst = new QLabel(this);
  29.     tekst->setStyleSheet("font: 38pt;");
  30.     tekst->setGeometry(QRect((width()/2)-10, (height()*7/9), 80, 80));
  31.     connect(timer, SIGNAL(timeout()), this, SLOT(updated()));
  32.     connect(slider, SIGNAL(valueChanged(int)), this, SLOT(predkosc(int)));
  33.     predkosc(3);
  34.     ui->setupUi(this);
  35. }
  36.  
  37. MainWindow::~MainWindow()
  38. {
  39.     delete ui;
  40. }
  41.  
  42.  
  43.  
  44. void MainWindow::paintEvent(QPaintEvent *){
  45.     QPainter painter(this);
  46.     static const QPoint hourHand[3] = {
  47.         QPoint(4, 4),
  48.         QPoint(-4, 4),
  49.         QPoint(0, -40)
  50.     };
  51.     static const QPoint minuteHand[3] = {
  52.         QPoint(4, 4),
  53.         QPoint(-4, 4),
  54.         QPoint(0, -90)
  55.     };
  56.  
  57.     QColor hourColor(127, 0, 127);
  58.     QColor minuteColor(0, 127, 127, 191);
  59.     int side = qMin(width(), height());
  60.     painter.setRenderHint(QPainter::Antialiasing);
  61.     painter.translate(width() / 2, height() / 2);
  62.     painter.scale(side / 200.0, side / 200.0);
  63.     painter.setPen(Qt::NoPen);
  64.     painter.setBrush(hourColor);
  65.     painter.rotate(ha);
  66.     painter.drawConvexPolygon(hourHand, 3);
  67.     painter.setBrush(minuteColor);
  68.     painter.rotate(lol);
  69.     painter.drawConvexPolygon(minuteHand, 3);
  70.  
  71. }
To copy to clipboard, switch view to plain text mode