Developer Documentation
zoomButton.cc
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49 
50 //== INCLUDES =================================================================
51 #include <QPixmap>
52 #include <QGraphicsItem>
53 #include <QGraphicsSceneMouseEvent>
54 
56 
57 #include "zoomButton.hh"
58 #include "graphicsScene.hh"
59 
60 //== NAMESPACES ===============================================================
61 namespace VSI {
62 
63 //=============================================================================
64 //
65 // CLASS VSI::ZoomButton - IMPLEMENTATION
66 //
67 //=============================================================================
68 
70 ZoomButton::ZoomButton (GraphicsScene *_scene, QGraphicsItem *_parent, Type _type) :
71  QGraphicsPixmapItem (_parent),
72  scene_ (_scene),
73  type_ (_type)
74 {
75 
76  // Load icon depending on type
77  switch (type_)
78  {
79  case In:
80  setPixmap (OpenFlipper::Options::iconDirStr()+OpenFlipper::Options::dirSeparator()+"zoom-in.png");
81  break;
82  case Out:
83  setPixmap (OpenFlipper::Options::iconDirStr()+OpenFlipper::Options::dirSeparator()+"zoom-out.png");
84  break;
85  }
86 
87  setOpacity (0.4);
88 
89  setAcceptHoverEvents (true);
90 
91  connect (&timer_, SIGNAL (timeout ()), this, SLOT (timeout ()));
92 }
93 
94 //------------------------------------------------------------------------------
95 
98 {
99 }
100 
101 //------------------------------------------------------------------------------
102 
103 // make the widget opaque if the mouse is over it
104 void ZoomButton::hoverEnterEvent (QGraphicsSceneHoverEvent * /*_event*/)
105 {
106  setOpacity (1.0);
107 }
108 
109 //------------------------------------------------------------------------------
110 
111 // make the widget transparent if the mouse leaves it
112 void ZoomButton::hoverLeaveEvent (QGraphicsSceneHoverEvent * /*_event*/)
113 {
114  setOpacity (0.4);
115 }
116 
117 //------------------------------------------------------------------------------
118 
119 // zoom the scene on mouse press
120 void ZoomButton::mousePressEvent (QGraphicsSceneMouseEvent *_event)
121 {
122  _event->accept ();
123 
124  switch (type_)
125  {
126  case In:
127  scene_->scaleElements (1.25);
128  break;
129  case Out:
130  scene_->scaleElements (0.8);
131  break;
132  }
133 
134  QRectF rect = scene_->sceneRect ();
135  pos_ = QPointF (rect.x () + (rect.width () / 2.0), rect.y () + (rect.height () / 2.0));
136 
137  // start timer for zooming during the mouse is pressed
138  timer_.start (500);
139 }
140 
141 //------------------------------------------------------------------------------
142 
143 // stop zooming on release
144 void ZoomButton::mouseReleaseEvent (QGraphicsSceneMouseEvent *_event)
145 {
146  _event->accept ();
147  timer_.stop ();
148 }
149 
150 //------------------------------------------------------------------------------
151 
152 // zoom on mouse wheel
153 void ZoomButton::wheelEvent (QGraphicsSceneWheelEvent *_event)
154 {
155  _event->accept ();
156 
157  qreal delta;
158 
159  if (_event->delta () > 0)
160  delta = 1.25;
161  else
162  delta = 0.8;
163 
164  scene_->scaleElements (delta);
165 }
166 
167 //------------------------------------------------------------------------------
168 
169 // zoom the scene on timeout
170 void ZoomButton::timeout ()
171 {
172  switch (type_)
173  {
174  case In:
175  scene_->scaleElements (1.25, pos_);
176  break;
177  case Out:
178  scene_->scaleElements (0.8, pos_);
179  break;
180  }
181 }
182 
183 //------------------------------------------------------------------------------
184 
186 void ZoomButton::activate (QPointF _pos)
187 {
188  pos_ = _pos;
189  setOpacity (1.0);
190  if (!timer_.isActive ())
191  timer_.start (500);
192 }
193 
194 //------------------------------------------------------------------------------
195 
198 {
199  setOpacity (0.4);
200  timer_.stop ();
201 }
202 
203 //------------------------------------------------------------------------------
204 
206 void ZoomButton::setGeometry (const QRectF &_rect)
207 {
208  QGraphicsPixmapItem::setPos (_rect.topLeft ());
209  QGraphicsLayoutItem::setGeometry (_rect);
210 }
211 
212 //------------------------------------------------------------------------------
213 
214 // size information for layouting
215 QSizeF ZoomButton::sizeHint (Qt::SizeHint _which, const QSizeF &/*_constraint*/) const
216 {
217  QSizeF sh;
218  switch (_which) {
219  case Qt::MinimumSize:
220  case Qt::PreferredSize:
221  case Qt::MaximumSize:
222  sh = QSizeF (pixmap ().width (), pixmap ().height ());
223  break;
224  default:
225  break;
226  }
227 
228  return sh;
229 }
230 
231 //------------------------------------------------------------------------------
232 }
virtual void setGeometry(const QRectF &_rect)
Sets the geometry.
Definition: zoomButton.cc:206
~ZoomButton()
Destructor.
Definition: zoomButton.cc:97
void scaleElements(qreal _delta)
Scale all elements with scaling center in the center of the scene.
void deactivate()
Stop the timer.
Definition: zoomButton.cc:197
ZoomButton(GraphicsScene *_scene, QGraphicsItem *_parent, Type _type)
Constructor.
Definition: zoomButton.cc:70
Type
Zoom type.
Definition: zoomButton.hh:74
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:186