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#include "interactiveview.hpp"
#define VIEW_CENTER viewport()->rect().center()
#define VIEW_WIDTH viewport()->rect().width()
#define VIEW_HEIGHT viewport()->rect().height()
InteractiveView::InteractiveView(QWidget * parent) :
QGraphicsView(parent)
{
// setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
// setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setMaxSize();
centerOn(0, 0);
zoomDelta = 0.1;
panSpeed = 4;
_doMousePanning = false;
_doKeyZoom = false;
_scale = 1.0;
panButton = Qt::MiddleButton;
zoomKey = Qt::Key_Z;
/* QGraphicsView turns it on for some reason,
* switching it back off to let BrowserTab handle it -krkk */
setAcceptDrops(false);
}
qreal InteractiveView::getScale() const
{
return _scale;
}
void InteractiveView::keyPressEvent(QKeyEvent * event)
{
qint32 key = event->key();
if(key == zoomKey){
_doKeyZoom = true;
}
if (_doKeyZoom){
if (key == Qt::Key_Up)
zoomIn();
else if (key == Qt::Key_Down)
zoomOut();
}
else{
QGraphicsView::keyPressEvent(event);
}
}
void InteractiveView::keyReleaseEvent(QKeyEvent * event)
{
if (event->key() == zoomKey){
_doKeyZoom = false;
}
QGraphicsView::keyReleaseEvent(event);
}
void InteractiveView::mouseMoveEvent(QMouseEvent * event)
{
if (_doMousePanning){
QPointF mouseDelta = mapToScene(event->pos()) - mapToScene(_lastMousePos);
pan(mouseDelta);
}
QGraphicsView::mouseMoveEvent(event);
_lastMousePos = event->pos();
}
void InteractiveView::mousePressEvent(QMouseEvent * event)
{
if (event->button() == panButton){
_lastMousePos = event->pos();
_doMousePanning = true;
}
QGraphicsView::mousePressEvent(event);
}
void InteractiveView::mouseReleaseEvent(QMouseEvent * event)
{
if (event->button() == panButton){
_doMousePanning = false;
}
QGraphicsView::mouseReleaseEvent(event);
}
void InteractiveView::wheelEvent(QWheelEvent *event)
{
QPoint scrollAmount = event->angleDelta();
// Apply zoom.
scrollAmount.y() > 0 ? zoomIn() : zoomOut();
}
void InteractiveView::setMaxSize()
{
setSceneRect(INT_MIN/2, INT_MIN/2, INT_MAX, INT_MAX);
}
void InteractiveView::zoom(float scaleFactor)
{
scale(scaleFactor, scaleFactor);
_scale *= scaleFactor;
}
void InteractiveView::zoomIn()
{
zoom(1 + zoomDelta);
}
void InteractiveView::zoomOut()
{
zoom (1 - zoomDelta);
}
void InteractiveView::pan(QPointF delta)
{
// Scale the pan amount by the current zoom.
delta *= _scale;
delta *= panSpeed;
// Have panning be anchored from the mouse.
setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
QPoint newCenter(VIEW_WIDTH / 2 - delta.x(), VIEW_HEIGHT / 2 - delta.y());
centerOn(mapToScene(newCenter));
// For zooming to anchor from the view center.
setTransformationAnchor(QGraphicsView::AnchorViewCenter);
}
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