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62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
#include <QPainter>
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#include "slideritem.h"
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#define SIZE 10
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SliderItem::SliderItem(QGraphicsItem *parent) : QGraphicsObject(parent)
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{
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setFlag(ItemIsMovable);
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setFlag(ItemSendsGeometryChanges);
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}
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QRectF SliderItem::boundingRect() const
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{
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return QRectF(-SIZE/2, -_area.height(), SIZE, _area.height());
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}
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void SliderItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
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QWidget *widget)
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{
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Q_UNUSED(option);
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Q_UNUSED(widget);
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painter->setRenderHint(QPainter::Antialiasing, false);
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painter->setPen(Qt::red);
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painter->drawLine(0, 0, 0, -_area.height());
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// painter->drawRect(boundingRect());
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}
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QVariant SliderItem::itemChange(GraphicsItemChange change, const QVariant &value)
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{
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if (change == ItemPositionChange && scene()) {
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QPointF pos = value.toPointF();
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if (!_area.contains(QRectF(pos, boundingRect().size()))) {
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pos.setX(qMin(_area.right(), qMax(pos.x(), _area.left())));
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pos.setY(qMin(_area.bottom(), qMax(pos.y(), _area.top()
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+ boundingRect().height())));
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return pos;
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}
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}
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if (change == ItemPositionHasChanged && scene())
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emit positionChanged(value.toPointF());
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return QGraphicsItem::itemChange(change, value);
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}
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void SliderItem::clear()
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{
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_area = QRectF();
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setPos(QPointF());
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}
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void SliderItem::setArea(const QRectF &area)
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{
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prepareGeometryChange();
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_area = area;
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}
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