Developer Documentation
button.cc
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41 
42 
43 
44 //== INCLUDES =================================================================
45 
46 #include <QPolygonF>
47 #include <QGraphicsItem>
48 #include <QFontMetrics>
49 #include <QPen>
50 #include <QPainter>
51 #include <QGraphicsSceneMouseEvent>
52 
53 #include "button.hh"
54 
55 #define BACK_OFFSET 2
56 
57 //== NAMESPACES ===============================================================
58 namespace VSI {
59 
60 //=============================================================================
61 //
62 // CLASS VSI::Button - IMPLEMENTATION
63 //
64 //=============================================================================
65 
67 Button::Button (QGraphicsItem *_parent) :
68  Text (_parent),
69  glow_ (false)
70 {
71  setBackground (true, true);
72  setAcceptHoverEvents (true);
73 }
74 
75 //------------------------------------------------------------------------------
76 
78 Button::Button (const QString &_text, QGraphicsItem *_parent) :
79  Text (_text, _parent),
80  glow_ (false)
81 {
82  setBackground (true, true);
83  setAcceptHoverEvents (true);
84 }
85 
86 //------------------------------------------------------------------------------
87 
90 {
91 }
92 
93 //------------------------------------------------------------------------------
94 
95 // glow on mouse enter
96 void Button::hoverEnterEvent (QGraphicsSceneHoverEvent * /*_event*/)
97 {
98  glow_ = true;
99  update ();
100 
101  QPen pen = backgroundPen_;
102  pen.setWidthF (1.0);
103  pen.setColor (QColor (127, 166, 218));
105 }
106 
107 //------------------------------------------------------------------------------
108 
109 // stop glowing on mouse leave
110 void Button::hoverLeaveEvent (QGraphicsSceneHoverEvent * /*_event*/)
111 {
112  glow_ = false;
113  update ();
114 
115  Text::setBackgroundPen (backgroundPen_);
116 }
117 
118 //------------------------------------------------------------------------------
119 
120 // emit pressed () on mouse press
121 void Button::mousePressEvent (QGraphicsSceneMouseEvent *_event)
122 {
123  QBrush brush = backgroundBrush_;
124 
125  brush.setColor (brush.color ().lighter (50));
126  Text::setBackgroundBrush (brush);
127  emit pressed ();
128  _event->accept ();
129 }
130 
131 //------------------------------------------------------------------------------
132 
133 // change brush back to normal
134 void Button::mouseReleaseEvent (QGraphicsSceneMouseEvent *_event)
135 {
136  Text::setBackgroundBrush (backgroundBrush_);
137  _event->accept ();
138 }
139 
140 //------------------------------------------------------------------------------
141 
143 void Button::setBackgroundBrush(QBrush _brush)
144 {
145  backgroundBrush_ = _brush;
146  Text::setBackgroundBrush (_brush);
147 }
148 
149 //------------------------------------------------------------------------------
150 
153 {
154  backgroundPen_ = _pen;
155  Text::setBackgroundPen (_pen);
156 }
157 
158 //------------------------------------------------------------------------------
159 
161 void Button::paint (QPainter *_painter, const QStyleOptionGraphicsItem *_option, QWidget *_widget)
162 {
163  if (glow_)
164  {
165  QPainterPath path = shape ();
166  QPen curr = _painter->pen ();
167 
168  QPen pen = backgroundPen_;
169  pen.setCapStyle(Qt::RoundCap);
170  pen.setJoinStyle(Qt::RoundJoin);
171 
172  pen.setColor (QColor (127, 166, 218, 64));
173  pen.setWidthF (7.0);
174  _painter->setPen (pen);
175  _painter->drawPath (path);
176  pen.setColor (QColor (127, 166, 218, 128));
177  pen.setWidthF (5.0);
178  _painter->setPen (pen);
179  _painter->drawPath (path);
180  pen.setColor (QColor (127, 166, 218, 192));
181  pen.setWidthF (3.0);
182  _painter->setPen (pen);
183  _painter->drawPath (path);
184 
185  _painter->setPen (curr);
186  }
187  Text::paint (_painter, _option, _widget);
188 }
189 
190 //------------------------------------------------------------------------------
191 
193 QRectF Button::boundingRect() const
194 {
195  QRectF rect = Text::boundingRect ();
196 
197  if (rect.width () && rect.height ())
198  rect.adjust(-3, -3, 3, 3);
199 
200  return rect;
201 }
202 
203 //------------------------------------------------------------------------------
204 
206 void Button::setGeometry(const QRectF & _rect)
207 {
208  Text::setGeometry (_rect);
209 }
210 
211 //------------------------------------------------------------------------------
212 }
void setBackgroundBrush(QBrush _brush)
Sets the background brush.
Definition: button.cc:143
virtual QRectF boundingRect() const
Bounding rectangle.
Definition: text.cc:342
void paint(QPainter *_painter, const QStyleOptionGraphicsItem *_option, QWidget *_widget=0)
Button glow painting.
Definition: button.cc:161
void pressed()
emmited if the button gets pressed
~Button()
Destructor.
Definition: button.cc:89
virtual void setBackgroundBrush(QBrush _brush)
Sets the background brush.
Definition: text.cc:379
Button(QGraphicsItem *_parent=0)
Constructor.
Definition: button.cc:67
virtual void setBackgroundPen(QPen _pen)
Sets the background pen.
Definition: text.cc:388
void setBackgroundPen(QPen _pen)
Sets the background pen.
Definition: button.cc:152
void setBackground(bool _leftOut, bool _rightOut)
Enables background painting.
Definition: text.cc:300
virtual void setGeometry(const QRectF &_rect)
Sets the geometry.
Definition: text.cc:102
void setGeometry(const QRectF &_rect)
Sets the geometry.
Definition: button.cc:206
virtual void paint(QPainter *_painter, const QStyleOptionGraphicsItem *_option, QWidget *_widget=0)
Background painting.
Definition: text.cc:185
QRectF boundingRect() const
Bounding rectangle.
Definition: button.cc:193
QPainterPath shape() const
Returns the shape for proper repainting/event handling.
Definition: text.cc:397