callout.cpp
102 lines
| 3.5 KiB
| text/x-c
|
CppLexer
Marek Rosa
|
r2150 | #include "callout.h" | ||
| #include <QPainter> | ||||
| #include <QFontMetrics> | ||||
| #include <QGraphicsSceneMouseEvent> | ||||
| #include <QCursor> | ||||
| 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())); | ||||
|
Marek Rosa
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r2152 | rect.setRight(qMax(m_textRect.right() + 4, anchor.x())); | ||
|
Marek Rosa
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r2150 | rect.setTop(qMin(m_textRect.top(), anchor.y())); | ||
|
Marek Rosa
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r2152 | rect.setBottom(qMax(m_textRect.bottom() + 4, anchor.y())); | ||
|
Marek Rosa
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r2150 | 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(2, 2, 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; | ||||
| } | ||||