LibQQt/examples/qqtchartexample/mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMouseEvent>
#include <QKeyEvent>
#include <qqtcore.h>
#include <qcustomplot.h>
#include <QTime>

QCPGraph* g0 = NULL;
QTime start;

MainWindow::MainWindow ( QWidget* parent ) :
    QMainWindow ( parent ),
    ui ( new Ui::MainWindow )
{
    ui->setupUi ( this );

    value = 0;
    curmaxValue = 80;

    ui->hs0->setRange ( 0, 100 );


    connect ( ui->hs0, SIGNAL ( valueChanged ( int ) ), this, SLOT ( setValue ( int ) ) );

    ui->hs0->installEventFilter ( this );

    m_timer = new QTimer ( this );
    m_timer->setSingleShot ( false );

    m_timer_down = new QTimer ( this );
    m_timer_down->setSingleShot ( false );

    connect ( m_timer_down, SIGNAL ( timeout() ), this, SLOT ( setValueDown() ) );
    connect ( m_timer, SIGNAL ( timeout() ), this, SLOT ( setValue() ) );

    m_timer_down->start ( 10 );

    ui->w99->xAxis->setTickLabelType ( QCPAxis::ltNumber );
    ui->w99->xAxis->setAutoTickStep ( true );
    ui->w99->xAxis->setTickStep ( 5 );
    ui->w99->xAxis->setRange ( 0, 100 );
    ui->w99->yAxis->setRange ( 0, 200 );


    g0 = ui->w99->addGraph ( ui->w99->xAxis, ui->w99->yAxis );
    start = QTime::currentTime();
}


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

void MainWindow::setValue ( int value )
{
    this->value = value;

    QTime ecl = QTime::currentTime();
    int key = -ecl.msecsTo ( start ) / 10;
    g0->addData ( key, ui->hs0->value() );
    ui->w99->xAxis->setRange ( 0, key + 100, Qt::AlignLeft );
    ui->w99->replot();
    //pline() << key;
}

void MainWindow::setValue()
{
    //pline() << value;
    if ( value > curmaxValue )
        return;

    if ( value < curmaxValue )
        value++;

    ui->hs0->setValue ( value );
}

void MainWindow::setValueDown()
{
    if ( value > 0 )
        value--;

    ui->hs0->setValue ( value );
}


void MainWindow::keyPressEvent ( QKeyEvent* event )
{
    //pline() << hex << event->key();
    if ( event->key() == Qt::Key_Up )
    {
        m_timer_down->stop();
        m_timer->start ( 10 );
        event->accept();
    }

    QMainWindow::keyPressEvent ( event );

}

void MainWindow::keyReleaseEvent ( QKeyEvent* event )
{
    if ( event->key() == Qt::Key_Up )
    {
        m_timer_down->start ( 10 );
        m_timer->stop();
        event->accept();
    }

    QMainWindow::keyReleaseEvent ( event );
}

bool MainWindow::eventFilter ( QObject* watched, QEvent* event )
{
    if ( event->type() != QEvent::Paint )
        ;//pline() << watched << hex << event->type();

    if ( watched == ui->hs0 )
    {
        if ( event->type() == QEvent::MouseButtonPress )
        {
            QMouseEvent* e = ( QMouseEvent* ) event;

            //pline() << hex << e->button();
            if ( e->button() == Qt::LeftButton )
            {
                curmaxValue = ui->hs0->minimum() + ( ui->hs0->maximum() - ui->hs0->minimum() ) * e->x() / ui->hs0->width();
                m_timer_down->stop();
                m_timer->start ( 10 );
                // not necessary because of the bug later.
                event->accept();
                // bug:in theory this return is not necessary, after accept, parent won't handle this e continue;
                // but, it handled. handled once, but child has no action any.
                // then, use return ,don't goto parent, well to use.
                return true;
            }
        }

        if ( event->type() == QEvent::MouseButtonRelease )
        {
            QMouseEvent* e = ( QMouseEvent* ) event;

            //pline() << hex << e->button();
            if ( e->button() == Qt::LeftButton )
            {
                curmaxValue = 80;
                m_timer->stop();
                m_timer_down->start ( 10 );
                event->accept();
                /*!
                 * linux
                 * after click slider, all key event come here....
                 * because, focus hasn't coming back,
                 * but on mac, focus has coming back.
                !*/
                ui->w99->setFocus();
                return true;
            }
        }

        if ( event->type() == QEvent::MouseMove )
        {
            QMouseEvent* e = ( QMouseEvent* ) event;

            //pline() << hex << e->button();
            if ( e->button() == Qt::NoButton )
            {
                curmaxValue = ui->hs0->minimum() + ( ui->hs0->maximum() - ui->hs0->minimum() ) * e->x() / ui->hs0->width();
                value = curmaxValue - 1;
                //pline() << curmaxValue;
                event->accept();
                return true;
            }
        }

        /*fix the parent handled bug terminally*/
        if ( event->type() == QEvent::Paint )
        {
            return QMainWindow::eventFilter ( watched, event );
        }

        //+ fix bug
        return true;
    }

    return QMainWindow::eventFilter ( watched, event );
}