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#include "callout.h"
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#include <QPainter>
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#include <QFontMetrics>
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#include <QGraphicsSceneMouseEvent>
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#include <QMouseEvent>
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Callout::Callout(QGraphicsItem * parent):
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QGraphicsItem(parent)
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{
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}
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QRectF Callout::boundingRect() const
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{
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QPointF anchor = mapFromParent(m_anchor);
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QRectF rect;
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rect.setLeft(qMin(m_textRect.left(), anchor.x()));
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rect.setRight(qMax(m_textRect.right() + 8, anchor.x()));
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rect.setTop(qMin(m_textRect.top(), anchor.y()));
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rect.setBottom(qMax(m_textRect.bottom() + 8, anchor.y()));
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return rect;
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}
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void Callout::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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Q_UNUSED(option)
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Q_UNUSED(widget)
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QPainterPath path;
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path.addRoundedRect(m_textRect, 5, 5);
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QPointF anchor = mapFromParent(m_anchor);
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if (!m_textRect.contains(anchor)) {
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QPointF point1, point2;
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// establish the position of the anchor point in relation to m_textRect
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bool above = anchor.y() <= m_textRect.top();
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bool aboveCenter = anchor.y() > m_textRect.top() && anchor.y() <= m_textRect.center().y();
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bool belowCenter = anchor.y() > m_textRect.center().y() && anchor.y() <= m_textRect.bottom();
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bool below = anchor.y() > m_textRect.bottom();
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bool onLeft = anchor.x() <= m_textRect.left();
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bool leftOfCenter = anchor.x() > m_textRect.left() && anchor.x() <= m_textRect.center().x();
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bool rightOfCenter = anchor.x() > m_textRect.center().x() && anchor.x() <= m_textRect.right();
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bool onRight = anchor.x() > m_textRect.right();
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// get the nearest m_textRect corner.
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qreal x = (onRight + rightOfCenter) * m_textRect.width();
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qreal y = (below + belowCenter) * m_textRect.height();
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bool cornerCase = (above && onLeft) || (above && onRight) || (below && onLeft) || (below && onRight);
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bool vertical = qAbs(anchor.x() - x) > qAbs(anchor.y() - y);
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qreal x1 = x + leftOfCenter * 10 - rightOfCenter * 20 + cornerCase * !vertical * (onLeft * 10 - onRight * 20);
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qreal y1 = y + aboveCenter * 10 - belowCenter * 20 + cornerCase * vertical * (above * 10 - below * 20);;
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point1.setX(x1);
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point1.setY(y1);
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qreal x2 = x + leftOfCenter * 20 - rightOfCenter * 10 + cornerCase * !vertical * (onLeft * 20 - onRight * 10);;
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qreal y2 = y + aboveCenter * 20 - belowCenter * 10 + cornerCase * vertical * (above * 20 - below * 10);;
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point2.setX(x2);
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point2.setY(y2);
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path.moveTo(point1);
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path.lineTo(mapFromParent(m_anchor));
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path.lineTo(point2);
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path = path.simplified();
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}
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painter->setBrush(QColor(255, 255, 255));
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painter->drawPath(path);
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painter->drawText(m_textRect.adjusted(4, 4, 0, 0), m_text);
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}
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void Callout::mousePressEvent(QGraphicsSceneMouseEvent *event)
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{
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if (m_textRect.contains(event->pos())) {
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m_clickOffset = event->pos();
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event->setAccepted(true);
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} else {
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event->setAccepted(false);
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}
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}
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void Callout::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
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{
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if (m_textRect.contains(event->pos())){
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setPos(mapToParent(event->pos() - m_clickOffset));
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event->setAccepted(true);
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} else {
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event->setAccepted(false);
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}
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}
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void Callout::setText(const QString &text)
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{
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m_text = text;
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QFontMetrics metrics(m_font);
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prepareGeometryChange();
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m_textRect = metrics.boundingRect(QRect(0, 0, 150, 150), Qt::AlignLeft, m_text).adjusted(0, 0, 4, 4);
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}
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void Callout::setAnchor(QPointF point)
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{
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m_anchor = point;
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}
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