callout.cpp
119 lines
| 4.1 KiB
| text/x-c
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CppLexer
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r2435 | /**************************************************************************** | ||
** | ||||
** Copyright (C) 2013 Digia Plc | ||||
** All rights reserved. | ||||
** For any questions to Digia, please use contact form at http://qt.digia.com | ||||
** | ||||
** This file is part of the Qt Commercial Charts Add-on. | ||||
** | ||||
** $QT_BEGIN_LICENSE$ | ||||
** Licensees holding valid Qt Commercial licenses may use this file in | ||||
** accordance with the Qt Commercial License Agreement provided with the | ||||
** Software or, alternatively, in accordance with the terms contained in | ||||
** a written agreement between you and Digia. | ||||
** | ||||
** If you have questions regarding the use of this file, please use | ||||
** contact form at http://qt.digia.com | ||||
** $QT_END_LICENSE$ | ||||
** | ||||
****************************************************************************/ | ||||
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r2150 | #include "callout.h" | ||
#include <QPainter> | ||||
#include <QFontMetrics> | ||||
#include <QGraphicsSceneMouseEvent> | ||||
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r2346 | #include <QMouseEvent> | ||
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r2150 | |||
Callout::Callout(QGraphicsItem * parent): | ||||
QGraphicsItem(parent) | ||||
{ | ||||
} | ||||
QRectF Callout::boundingRect() const | ||||
{ | ||||
QPointF anchor = mapFromParent(m_anchor); | ||||
QRectF rect; | ||||
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r2378 | rect.setLeft(qMin(m_rect.left(), anchor.x())); | ||
rect.setRight(qMax(m_rect.right(), anchor.x())); | ||||
rect.setTop(qMin(m_rect.top(), anchor.y())); | ||||
rect.setBottom(qMax(m_rect.bottom(), anchor.y())); | ||||
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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; | ||||
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r2378 | path.addRoundedRect(m_rect, 5, 5); | ||
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r2150 | |||
QPointF anchor = mapFromParent(m_anchor); | ||||
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r2378 | if (!m_rect.contains(anchor)) { | ||
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r2150 | QPointF point1, point2; | ||
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r2393 | // establish the position of the anchor point in relation to m_rect | ||
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r2378 | bool above = anchor.y() <= m_rect.top(); | ||
bool aboveCenter = anchor.y() > m_rect.top() && anchor.y() <= m_rect.center().y(); | ||||
bool belowCenter = anchor.y() > m_rect.center().y() && anchor.y() <= m_rect.bottom(); | ||||
bool below = anchor.y() > m_rect.bottom(); | ||||
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r2150 | |||
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r2378 | bool onLeft = anchor.x() <= m_rect.left(); | ||
bool leftOfCenter = anchor.x() > m_rect.left() && anchor.x() <= m_rect.center().x(); | ||||
bool rightOfCenter = anchor.x() > m_rect.center().x() && anchor.x() <= m_rect.right(); | ||||
bool onRight = anchor.x() > m_rect.right(); | ||||
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r2150 | |||
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r2393 | // get the nearest m_rect corner. | ||
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r2378 | qreal x = (onRight + rightOfCenter) * m_rect.width(); | ||
qreal y = (below + belowCenter) * m_rect.height(); | ||||
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r2150 | 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); | ||||
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r2378 | painter->drawText(m_textRect, m_text); | ||
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r2150 | } | ||
void Callout::mousePressEvent(QGraphicsSceneMouseEvent *event) | ||||
{ | ||||
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r2379 | event->setAccepted(true); | ||
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r2150 | } | ||
void Callout::mouseMoveEvent(QGraphicsSceneMouseEvent *event) | ||||
{ | ||||
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r2378 | if (event->buttons() & Qt::LeftButton){ | ||
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r2379 | setPos(mapToParent(event->pos() - event->buttonDownPos(Qt::LeftButton))); | ||
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r2150 | event->setAccepted(true); | ||
} else { | ||||
event->setAccepted(false); | ||||
} | ||||
} | ||||
void Callout::setText(const QString &text) | ||||
{ | ||||
m_text = text; | ||||
QFontMetrics metrics(m_font); | ||||
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r2378 | m_textRect = metrics.boundingRect(QRect(0, 0, 150, 150), Qt::AlignLeft, m_text); | ||
m_textRect.translate(5, 5); | ||||
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r2379 | prepareGeometryChange(); | ||
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r2378 | m_rect = m_textRect.adjusted(-5, -5, 5, 5); | ||
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r2150 | } | ||
void Callout::setAnchor(QPointF point) | ||||
{ | ||||
m_anchor = point; | ||||
} | ||||