Developer Documentation
zoomButton.cc
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41 
42 
43 
44 //== INCLUDES =================================================================
45 #include <QPixmap>
46 #include <QGraphicsItem>
47 #include <QGraphicsSceneMouseEvent>
48 
50 
51 #include "zoomButton.hh"
52 #include "graphicsScene.hh"
53 
54 //== NAMESPACES ===============================================================
55 namespace VSI {
56 
57 //=============================================================================
58 //
59 // CLASS VSI::ZoomButton - IMPLEMENTATION
60 //
61 //=============================================================================
62 
64 ZoomButton::ZoomButton (GraphicsScene *_scene, QGraphicsItem *_parent, Type _type) :
65  QGraphicsPixmapItem (_parent),
66  scene_ (_scene),
67  type_ (_type)
68 {
69 
70  // Load icon depending on type
71  switch (type_)
72  {
73  case In:
74  setPixmap (OpenFlipper::Options::iconDirStr()+OpenFlipper::Options::dirSeparator()+"zoom-in.png");
75  break;
76  case Out:
77  setPixmap (OpenFlipper::Options::iconDirStr()+OpenFlipper::Options::dirSeparator()+"zoom-out.png");
78  break;
79  }
80 
81  setOpacity (0.4);
82 
83  setAcceptHoverEvents (true);
84 
85  connect (&timer_, SIGNAL (timeout ()), this, SLOT (timeout ()));
86 }
87 
88 //------------------------------------------------------------------------------
89 
92 {
93 }
94 
95 //------------------------------------------------------------------------------
96 
97 // make the widget opaque if the mouse is over it
98 void ZoomButton::hoverEnterEvent (QGraphicsSceneHoverEvent * /*_event*/)
99 {
100  setOpacity (1.0);
101 }
102 
103 //------------------------------------------------------------------------------
104 
105 // make the widget transparent if the mouse leaves it
106 void ZoomButton::hoverLeaveEvent (QGraphicsSceneHoverEvent * /*_event*/)
107 {
108  setOpacity (0.4);
109 }
110 
111 //------------------------------------------------------------------------------
112 
113 // zoom the scene on mouse press
114 void ZoomButton::mousePressEvent (QGraphicsSceneMouseEvent *_event)
115 {
116  _event->accept ();
117 
118  switch (type_)
119  {
120  case In:
121  scene_->scaleElements (1.25);
122  break;
123  case Out:
124  scene_->scaleElements (0.8);
125  break;
126  }
127 
128  QRectF rect = scene_->sceneRect ();
129  pos_ = QPointF (rect.x () + (rect.width () / 2.0), rect.y () + (rect.height () / 2.0));
130 
131  // start timer for zooming during the mouse is pressed
132  timer_.start (500);
133 }
134 
135 //------------------------------------------------------------------------------
136 
137 // stop zooming on release
138 void ZoomButton::mouseReleaseEvent (QGraphicsSceneMouseEvent *_event)
139 {
140  _event->accept ();
141  timer_.stop ();
142 }
143 
144 //------------------------------------------------------------------------------
145 
146 // zoom on mouse wheel
147 void ZoomButton::wheelEvent (QGraphicsSceneWheelEvent *_event)
148 {
149  _event->accept ();
150 
151  qreal delta;
152 
153  if (_event->delta () > 0)
154  delta = 1.25;
155  else
156  delta = 0.8;
157 
158  scene_->scaleElements (delta);
159 }
160 
161 //------------------------------------------------------------------------------
162 
163 // zoom the scene on timeout
164 void ZoomButton::timeout ()
165 {
166  switch (type_)
167  {
168  case In:
169  scene_->scaleElements (1.25, pos_);
170  break;
171  case Out:
172  scene_->scaleElements (0.8, pos_);
173  break;
174  }
175 }
176 
177 //------------------------------------------------------------------------------
178 
180 void ZoomButton::activate (QPointF _pos)
181 {
182  pos_ = _pos;
183  setOpacity (1.0);
184  if (!timer_.isActive ())
185  timer_.start (500);
186 }
187 
188 //------------------------------------------------------------------------------
189 
192 {
193  setOpacity (0.4);
194  timer_.stop ();
195 }
196 
197 //------------------------------------------------------------------------------
198 
200 void ZoomButton::setGeometry (const QRectF &_rect)
201 {
202  QGraphicsPixmapItem::setPos (_rect.topLeft ());
203  QGraphicsLayoutItem::setGeometry (_rect);
204 }
205 
206 //------------------------------------------------------------------------------
207 
208 // size information for layouting
209 QSizeF ZoomButton::sizeHint (Qt::SizeHint _which, const QSizeF &/*_constraint*/) const
210 {
211  QSizeF sh;
212  switch (_which) {
213  case Qt::MinimumSize:
214  case Qt::PreferredSize:
215  case Qt::MaximumSize:
216  sh = QSizeF (pixmap ().width (), pixmap ().height ());
217  break;
218  default:
219  break;
220  }
221 
222  return sh;
223 }
224 
225 //------------------------------------------------------------------------------
226 }
~ZoomButton()
Destructor.
Definition: zoomButton.cc:91
void activate(QPointF _pos)
Activates the timer for zoom with center at _pos (will be called if an element is moved above) ...
Definition: zoomButton.cc:180
Type
Zoom type.
Definition: zoomButton.hh:68
virtual void setGeometry(const QRectF &_rect)
Sets the geometry.
Definition: zoomButton.cc:200
void scaleElements(qreal _delta)
Scale all elements with scaling center in the center of the scene.
ZoomButton(GraphicsScene *_scene, QGraphicsItem *_parent, Type _type)
Constructor.
Definition: zoomButton.cc:64
void deactivate()
Stop the timer.
Definition: zoomButton.cc:191