Developer Documentation

QtGraphicsButton.cc
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40 \*===========================================================================*/
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45
46 //=============================================================================
47 //
48 // CLASS QtGraphicsButton - IMPLEMENTATION
49 //
50 //=============================================================================
51
52 //== INCLUDES =================================================================
53
54 #include <QPainter>
55 #include <QGraphicsSceneMouseEvent>
56
57 #include "QtGraphicsButton.hh"
58
59 //== IMPLEMENTATION ==========================================================
60
61 QtGraphicsButton::QtGraphicsButton (const QImage &_image, QGraphicsItem *_parent, int _width, int _height) :
62 QGraphicsItem (_parent),
63 checkable_(false),
64 checked_(false),
65 pressed_(false),
66 over_(false),
67 width_(_width),
68 height_(_height)
69 {
70 if (width_ <= 0)
71 width_ = _image.width ();
72 if (height_ <= 0)
73 height_ = _image.height ();
74
75 // scale image to button dimensions
76 QImage i = _image.scaled (width_, height_, Qt::IgnoreAspectRatio, Qt::SmoothTransformation).convertToFormat (QImage::Format_ARGB32);
77
78 checkedPix_ = QPixmap::fromImage (i);
79
80 // generate black/white and transparent images for the other button states
81 QImage normal (width_, height_, QImage::Format_ARGB32);
82 QImage over (width_, height_, QImage::Format_ARGB32);
83
84 for (int x = 0; x < width_; x++)
85 for (int y = 0; y < height_; y++)
86 {
87 QRgb pix = i.pixel (x, y);
88 over.setPixel (x, y, qRgba (qRed (pix), qGreen (pix), qBlue (pix), qAlpha (pix) * 0.5));
89 normal.setPixel (x, y, qRgba (qGray (pix), qGray (pix), qGray (pix), qAlpha (pix) * 0.3));
90 }
91 overPix_ = QPixmap::fromImage (over);
92 normalPix_ = QPixmap::fromImage (normal);
93
94 setAcceptHoverEvents (true);
95 }
96
97 //-----------------------------------------------------------------------------
98
99 QRectF QtGraphicsButton::boundingRect () const
100 {
101 return QRectF (QPointF(0, 0), QSizeF (width_, height_));
102 }
103
104 //-----------------------------------------------------------------------------
105
106 void QtGraphicsButton::paint (QPainter *_painter, const QStyleOptionGraphicsItem *, QWidget *)
107 {
108 _painter->setClipping (false);
109 if (pressed_ || checked_)
110 _painter->drawPixmap (0, 0, checkedPix_);
111 else if (over_)
112 _painter->drawPixmap (0, 0, overPix_);
113 else
114 _painter->drawPixmap (0, 0, normalPix_);
115 }
116
117 //-----------------------------------------------------------------------------
118
119 void QtGraphicsButton::setCheckable (bool _value)
120 {
121 checkable_ = _value;
122 }
123
124 //-----------------------------------------------------------------------------
125
126 void QtGraphicsButton::setChecked (bool _value)
127 {
128 checked_ = _value;
129 }
130
131 //-----------------------------------------------------------------------------
132
133 bool QtGraphicsButton::isChecked () const
134 {
135 return checked_;
136 }
137
138 //-----------------------------------------------------------------------------
139
140 void QtGraphicsButton::hoverEnterEvent (QGraphicsSceneHoverEvent *)
141 {
142 over_ = true;
143 update ();
144 }
145
146 //-----------------------------------------------------------------------------
147
148 void QtGraphicsButton::hoverLeaveEvent (QGraphicsSceneHoverEvent *)
149 {
150 over_ = false;
151 update ();
152 }
153
154 //-----------------------------------------------------------------------------
155
156 void QtGraphicsButton::mousePressEvent ( QGraphicsSceneMouseEvent *_event)
157 {
158 _event->accept ();
159 pressed_ = true;
160 if (checkable_)
161 checked_ = !checked_;
162 update ();
163
164 emit pressed ();
165 }
166
167 //-----------------------------------------------------------------------------
168
169 void QtGraphicsButton::mouseReleaseEvent (QGraphicsSceneMouseEvent *_event)
170 {
171 _event->accept ();
172 pressed_ = false;
173 update ();
174 }
175
176 //-----------------------------------------------------------------------------
177
178 QVariant QtGraphicsButton::itemChange (GraphicsItemChange _change, const QVariant &_value)
179 {
180 // reset state if button was hidden
181 if (_change == QGraphicsItem::ItemVisibleHasChanged)
182 {
183 pressed_ = false;
184 over_ = false;
185 }
186 return QGraphicsItem::itemChange (_change, _value);
187 }
188
189 //=============================================================================
QtGraphicsButton::setChecked
void setChecked(bool _value)
sets button checked state
Definition: QtGraphicsButton.cc:126
QtGraphicsButton::boundingRect
virtual QRectF boundingRect() const
returns the bounding rect
Definition: QtGraphicsButton.cc:99
QtGraphicsButton::QtGraphicsButton
QtGraphicsButton(const QImage &_image, QGraphicsItem *_parent=0, int _width=-1, int _height=-1)
Definition: QtGraphicsButton.cc:61
QtGraphicsButton::checkable_
bool checkable_
button state
Definition: QtGraphicsButton.hh:114
QtGraphicsButton::normalPix_
QPixmap normalPix_
pixmaps for different button states
Definition: QtGraphicsButton.hh:124
QtGraphicsButton::hoverEnterEvent
virtual void hoverEnterEvent(QGraphicsSceneHoverEvent *_event)
event tracking
Definition: QtGraphicsButton.cc:140
QtGraphicsButton::width_
int width_
button size
Definition: QtGraphicsButton.hh:120
QtGraphicsButton::isChecked
bool isChecked() const
returns button checked state
Definition: QtGraphicsButton.cc:133
QtGraphicsButton::paint
virtual void paint(QPainter *_painter, const QStyleOptionGraphicsItem *_option, QWidget *_widget=0)
paints the button
Definition: QtGraphicsButton.cc:106
QtGraphicsButton::pressed
void pressed()
signals a button press
QtGraphicsButton::setCheckable
void setCheckable(bool _value)
makes the button checkable
Definition: QtGraphicsButton.cc:119