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#include <QtGui>

#include "paintarea.h"

PaintArea::PaintArea(QWidget *parent)
     : QWidget(parent)
 {
     m_bitmap = QImage(this->size(), QImage::Format_ARGB32);
     // enable mouse tracking
     this->setMouseTracking(true);
     // enable keyboard focus
     setFocusPolicy(Qt::StrongFocus);

 }

void PaintArea::resizeEvent(QResizeEvent *event)
{
    m_bitmap = QImage(this->size(), QImage::Format_ARGB32);
    //qDebug() << "paintarea resize" << this->size();
}
void PaintArea::paintEvent(QPaintEvent *)
{

    QPainter painter(this);
    QPainter pxpainter(&m_bitmap);

     emit needsPainting(pxpainter);
     painter.drawImage(rect(), m_bitmap);
}

void PaintArea::mousePressEvent ( QMouseEvent * event )
{
    m_lastDown = event->pos();
    //emit mouseClick(event->pos());
}

void PaintArea::mouseMoveEvent( QMouseEvent * event )
{
    if (event->buttons() == Qt::LeftButton)
        setCursor(Qt::ClosedHandCursor);
    emit mouseMove(event->pos());
}

void PaintArea::wheelEvent ( QWheelEvent * event )
{
    emit mouseWheel(event->pos(), event->delta() / 120);
}

void PaintArea::mouseReleaseEvent ( QMouseEvent * event )
{
    setCursor(Qt::CrossCursor);

    if ( (event->pos()-m_lastDown).manhattanLength() > 2) {
        emit mouseDrag(m_lastDown, event->pos(), event->button());
    } else {
        // a click event...
        emit mouseClick(event->pos());
    }
}

void PaintArea::keyPressEvent(QKeyEvent *event)
{
    // emulate mouse actions with the keyboard
    QPoint mousepos = this->rect().center();
    switch (event->key()) {
        case Qt::Key_Plus:
        case Qt::Key_PageUp:  // zoom in
            emit mouseWheel(mousepos, 1);
            break;

        case Qt::Key_PageDown: // zoom out
        case Qt::Key_Minus:
            emit mouseWheel(mousepos, -1);
            break;
        // pan with cursor keys
        case Qt::Key_Left:
            emit mouseDrag(mousepos, mousepos + QPoint(20, 0), Qt::MidButton); break;
        case Qt::Key_Right:
            emit mouseDrag(mousepos, mousepos + QPoint(-20, 0), Qt::MidButton); break;

        case Qt::Key_Up:
            emit mouseDrag(mousepos, mousepos + QPoint(0, 20), Qt::MidButton); break;
        case Qt::Key_Down:
            emit mouseDrag(mousepos, mousepos + QPoint(0, -20), Qt::MidButton); break;
        }
}