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Callout example: removed unnecessary variable
Marek Rosa -
r2379:9645dba0fec9
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@@ -1,104 +1,99
1 #include "callout.h"
1 #include "callout.h"
2 #include <QPainter>
2 #include <QPainter>
3 #include <QFontMetrics>
3 #include <QFontMetrics>
4 #include <QGraphicsSceneMouseEvent>
4 #include <QGraphicsSceneMouseEvent>
5 #include <QMouseEvent>
5 #include <QMouseEvent>
6
6
7 Callout::Callout(QGraphicsItem * parent):
7 Callout::Callout(QGraphicsItem * parent):
8 QGraphicsItem(parent)
8 QGraphicsItem(parent)
9 {
9 {
10 }
10 }
11
11
12 QRectF Callout::boundingRect() const
12 QRectF Callout::boundingRect() const
13 {
13 {
14 QPointF anchor = mapFromParent(m_anchor);
14 QPointF anchor = mapFromParent(m_anchor);
15 QRectF rect;
15 QRectF rect;
16 rect.setLeft(qMin(m_rect.left(), anchor.x()));
16 rect.setLeft(qMin(m_rect.left(), anchor.x()));
17 rect.setRight(qMax(m_rect.right(), anchor.x()));
17 rect.setRight(qMax(m_rect.right(), anchor.x()));
18 rect.setTop(qMin(m_rect.top(), anchor.y()));
18 rect.setTop(qMin(m_rect.top(), anchor.y()));
19 rect.setBottom(qMax(m_rect.bottom(), anchor.y()));
19 rect.setBottom(qMax(m_rect.bottom(), anchor.y()));
20 return rect;
20 return rect;
21 }
21 }
22
22
23 void Callout::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
23 void Callout::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
24 {
24 {
25 Q_UNUSED(option)
25 Q_UNUSED(option)
26 Q_UNUSED(widget)
26 Q_UNUSED(widget)
27 QPainterPath path;
27 QPainterPath path;
28 path.addRoundedRect(m_rect, 5, 5);
28 path.addRoundedRect(m_rect, 5, 5);
29
29
30 QPointF anchor = mapFromParent(m_anchor);
30 QPointF anchor = mapFromParent(m_anchor);
31 if (!m_rect.contains(anchor)) {
31 if (!m_rect.contains(anchor)) {
32 QPointF point1, point2;
32 QPointF point1, point2;
33
33
34 // establish the position of the anchor point in relation to m_textRect
34 // establish the position of the anchor point in relation to m_textRect
35 bool above = anchor.y() <= m_rect.top();
35 bool above = anchor.y() <= m_rect.top();
36 bool aboveCenter = anchor.y() > m_rect.top() && anchor.y() <= m_rect.center().y();
36 bool aboveCenter = anchor.y() > m_rect.top() && anchor.y() <= m_rect.center().y();
37 bool belowCenter = anchor.y() > m_rect.center().y() && anchor.y() <= m_rect.bottom();
37 bool belowCenter = anchor.y() > m_rect.center().y() && anchor.y() <= m_rect.bottom();
38 bool below = anchor.y() > m_rect.bottom();
38 bool below = anchor.y() > m_rect.bottom();
39
39
40 bool onLeft = anchor.x() <= m_rect.left();
40 bool onLeft = anchor.x() <= m_rect.left();
41 bool leftOfCenter = anchor.x() > m_rect.left() && anchor.x() <= m_rect.center().x();
41 bool leftOfCenter = anchor.x() > m_rect.left() && anchor.x() <= m_rect.center().x();
42 bool rightOfCenter = anchor.x() > m_rect.center().x() && anchor.x() <= m_rect.right();
42 bool rightOfCenter = anchor.x() > m_rect.center().x() && anchor.x() <= m_rect.right();
43 bool onRight = anchor.x() > m_rect.right();
43 bool onRight = anchor.x() > m_rect.right();
44
44
45 // get the nearest m_textRect corner.
45 // get the nearest m_textRect corner.
46 qreal x = (onRight + rightOfCenter) * m_rect.width();
46 qreal x = (onRight + rightOfCenter) * m_rect.width();
47 qreal y = (below + belowCenter) * m_rect.height();
47 qreal y = (below + belowCenter) * m_rect.height();
48 bool cornerCase = (above && onLeft) || (above && onRight) || (below && onLeft) || (below && onRight);
48 bool cornerCase = (above && onLeft) || (above && onRight) || (below && onLeft) || (below && onRight);
49 bool vertical = qAbs(anchor.x() - x) > qAbs(anchor.y() - y);
49 bool vertical = qAbs(anchor.x() - x) > qAbs(anchor.y() - y);
50
50
51 qreal x1 = x + leftOfCenter * 10 - rightOfCenter * 20 + cornerCase * !vertical * (onLeft * 10 - onRight * 20);
51 qreal x1 = x + leftOfCenter * 10 - rightOfCenter * 20 + cornerCase * !vertical * (onLeft * 10 - onRight * 20);
52 qreal y1 = y + aboveCenter * 10 - belowCenter * 20 + cornerCase * vertical * (above * 10 - below * 20);;
52 qreal y1 = y + aboveCenter * 10 - belowCenter * 20 + cornerCase * vertical * (above * 10 - below * 20);;
53 point1.setX(x1);
53 point1.setX(x1);
54 point1.setY(y1);
54 point1.setY(y1);
55
55
56 qreal x2 = x + leftOfCenter * 20 - rightOfCenter * 10 + cornerCase * !vertical * (onLeft * 20 - onRight * 10);;
56 qreal x2 = x + leftOfCenter * 20 - rightOfCenter * 10 + cornerCase * !vertical * (onLeft * 20 - onRight * 10);;
57 qreal y2 = y + aboveCenter * 20 - belowCenter * 10 + cornerCase * vertical * (above * 20 - below * 10);;
57 qreal y2 = y + aboveCenter * 20 - belowCenter * 10 + cornerCase * vertical * (above * 20 - below * 10);;
58 point2.setX(x2);
58 point2.setX(x2);
59 point2.setY(y2);
59 point2.setY(y2);
60
60
61 path.moveTo(point1);
61 path.moveTo(point1);
62 path.lineTo(mapFromParent(m_anchor));
62 path.lineTo(mapFromParent(m_anchor));
63 path.lineTo(point2);
63 path.lineTo(point2);
64 path = path.simplified();
64 path = path.simplified();
65 }
65 }
66 painter->setBrush(QColor(255, 255, 255));
66 painter->setBrush(QColor(255, 255, 255));
67 painter->drawPath(path);
67 painter->drawPath(path);
68 painter->drawText(m_textRect, m_text);
68 painter->drawText(m_textRect, m_text);
69 }
69 }
70
70
71 void Callout::mousePressEvent(QGraphicsSceneMouseEvent *event)
71 void Callout::mousePressEvent(QGraphicsSceneMouseEvent *event)
72 {
72 {
73 if (m_rect.contains(event->pos())) {
74 m_clickOffset = event->pos();
75 event->setAccepted(true);
73 event->setAccepted(true);
76 } else {
77 event->setAccepted(false);
78 }
79 }
74 }
80
75
81 void Callout::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
76 void Callout::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
82 {
77 {
83 if (event->buttons() & Qt::LeftButton){
78 if (event->buttons() & Qt::LeftButton){
84 setPos(mapToParent(event->pos() - m_clickOffset));
79 setPos(mapToParent(event->pos() - event->buttonDownPos(Qt::LeftButton)));
85 event->setAccepted(true);
80 event->setAccepted(true);
86 } else {
81 } else {
87 event->setAccepted(false);
82 event->setAccepted(false);
88 }
83 }
89 }
84 }
90
85
91 void Callout::setText(const QString &text)
86 void Callout::setText(const QString &text)
92 {
87 {
93 m_text = text;
88 m_text = text;
94 QFontMetrics metrics(m_font);
89 QFontMetrics metrics(m_font);
95 m_textRect = metrics.boundingRect(QRect(0, 0, 150, 150), Qt::AlignLeft, m_text);
90 m_textRect = metrics.boundingRect(QRect(0, 0, 150, 150), Qt::AlignLeft, m_text);
96 m_textRect.translate(5, 5);
91 m_textRect.translate(5, 5);
97 prepareGeometryChange();
92 prepareGeometryChange();
98 m_rect = m_textRect.adjusted(-5, -5, 5, 5);
93 m_rect = m_textRect.adjusted(-5, -5, 5, 5);
99 }
94 }
100
95
101 void Callout::setAnchor(QPointF point)
96 void Callout::setAnchor(QPointF point)
102 {
97 {
103 m_anchor = point;
98 m_anchor = point;
104 }
99 }
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@@ -1,33 +1,32
1 #ifndef CALLOUT_H
1 #ifndef CALLOUT_H
2 #define CALLOUT_H
2 #define CALLOUT_H
3
3
4 #include <QGraphicsItem>
4 #include <QGraphicsItem>
5 #include <QFont>
5 #include <QFont>
6
6
7 class QGraphicsSceneMouseEvent;
7 class QGraphicsSceneMouseEvent;
8
8
9 class Callout : public QGraphicsItem
9 class Callout : public QGraphicsItem
10 {
10 {
11 public:
11 public:
12 Callout(QGraphicsItem * parent = 0);
12 Callout(QGraphicsItem * parent = 0);
13
13
14 void setText(const QString &text);
14 void setText(const QString &text);
15 void setAnchor(QPointF point);
15 void setAnchor(QPointF point);
16
16
17 QRectF boundingRect() const;
17 QRectF boundingRect() const;
18 void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,QWidget *widget);
18 void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,QWidget *widget);
19
19
20 protected:
20 protected:
21 void mousePressEvent(QGraphicsSceneMouseEvent *event);
21 void mousePressEvent(QGraphicsSceneMouseEvent *event);
22 void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
22 void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
23
23
24 private:
24 private:
25 QString m_text;
25 QString m_text;
26 QRectF m_textRect;
26 QRectF m_textRect;
27 QRectF m_rect;
27 QRectF m_rect;
28 QPointF m_anchor;
28 QPointF m_anchor;
29 QFont m_font;
29 QFont m_font;
30 QPointF m_clickOffset;
31 };
30 };
32
31
33 #endif // CALLOUT_H
32 #endif // CALLOUT_H
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