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