1 /**************************************************************************\
2 * Copyright (c) Kongsberg Oil & Gas Technologies AS
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31 \**************************************************************************/
32
33 // This class' purpose is to overload the Qt OpenGL widget, so we can
34 // do our own initialization and event handling on resizes and expose
35 // events.
36
37 #ifdef HAVE_CONFIG_H
38 #include <config.h>
39 #endif // HAVE_CONFIG_H
40 #include <qt-config.h>
41
42 #include <assert.h>
43
44 #include <qmetaobject.h>
45 #include <qnamespace.h>
46 #include <qevent.h>
47
48 #include <Inventor/errors/SoDebugError.h>
49
50 #include <Inventor/Qt/widgets/SoQtGLArea.h>
51 #include <Inventor/Qt/widgets/moc_SoQtGLArea.icc>
52 #include <soqtdefs.h>
53
54 // ************************************************************************
55
56 // Take care of namespace incompatibilities between Qt 3 and Qt 4.
57
58 #if QT_VERSION < 0x040000 // pre Qt 4
59 #define QTWIDGET_STRONGFOCUS QWidget::StrongFocus
60 #else // Qt 4.0.0+
61 #define QTWIDGET_STRONGFOCUS Qt::StrongFocus
62 #endif // Qt 4.0.0+
63
64 // *************************************************************************
65
66 #if SOQT_DEBUG && 0 // switch 0<->1 to toggle debugging info on/off
67
68 #define SOQT_GLAREA_DEBUG_INFO(_funcname_, _infostr_) \
69 do { \
70 SbString s("SoQtGLArea::"); \
71 s += SO__QUOTE(_funcname_); \
72 SoDebugError::postInfo(s.getString(), _infostr_); \
73 } while (0)
74
75 #define SOQT_GLAREA_DEBUG_START(_funcname_) SOQT_GLAREA_DEBUG_INFO(_funcname_, "start")
76 #define SOQT_GLAREA_DEBUG_DONE(_funcname_) SOQT_GLAREA_DEBUG_INFO(_funcname_, "done")
77
78 #else // !debug
79
80 #define SOQT_GLAREA_DEBUG_START(_funcname_)
81 #define SOQT_GLAREA_DEBUG_DONE(_funcname_)
82
83 #endif // !debug
84
85 // *************************************************************************
86
SoQtGLArea(QGLFormat * const format,QWidget * const parent,const QGLWidget * sharewidget,const char * const name)87 SoQtGLArea::SoQtGLArea(QGLFormat * const format,
88 QWidget * const parent,
89 const QGLWidget * sharewidget,
90 const char * const name)
91 #if QT_VERSION >= 0x040000
92 : inherited(*format, parent, sharewidget)
93 #else
94 : inherited(*format, parent, NULL, sharewidget, Qt::WResizeNoErase)
95 #endif
96 {
97 #if QT_VERSION >= 0x040000
98 this->setObjectName(name);
99 #else
100 this->setName(name);
101 #endif
102 #if HAVE_QGLWIDGET_SETAUTOBUFFERSWAP
103 // We'll handle the OpenGL buffer swapping ourselves, to support the
104 // different combinations of rendering options (doublebuffer with
105 // the "DrawToFront" flag is for instance hard to do within the
106 // QGLWidget model).
107 this->setAutoBufferSwap(FALSE);
108 #endif // HAVE_QGLWIDGET_SETAUTOBUFFERSWAP
109
110 this->keycb = NULL;
111 this->setFocusPolicy(QTWIDGET_STRONGFOCUS);
112 }
113
~SoQtGLArea()114 SoQtGLArea::~SoQtGLArea()
115 {
116 }
117
118 // Overridden from QGLWidget to emit a signal.
119 void
initializeGL(void)120 SoQtGLArea::initializeGL(void)
121 {
122 SOQT_GLAREA_DEBUG_START(initializeGL);
123 emit this->init_sig();
124 SOQT_GLAREA_DEBUG_DONE(initializeGL);
125 }
126
127 // Overridden from QtGLWidget to emit a signal.
128 void
resizeGL(int width,int height)129 SoQtGLArea::resizeGL(int width, int height)
130 {
131 SOQT_GLAREA_DEBUG_START(resizeGL);
132 emit this->reshape_sig(width, height);
133 SOQT_GLAREA_DEBUG_DONE(resizeGL);
134 }
135
136 // Overridden from QtGLWidget. Emit a signal whenever we need to
137 // repaint because of an expose event.
138 void
paintGL(void)139 SoQtGLArea::paintGL(void)
140 {
141 SOQT_GLAREA_DEBUG_START(paintGL);
142 emit this->expose_sig();
143 SOQT_GLAREA_DEBUG_DONE(paintGL);
144 }
145
146 // Overridden from QWidget to avoid update() being called when we
147 // enable another focuspolicy than QWidget::NoFocus.
148 void
focusInEvent(QFocusEvent * e)149 SoQtGLArea::focusInEvent(QFocusEvent * e)
150 {
151 // Here's what the QWidget implementation of this method does:
152
153 // if ( focusPolicy() != NoFocus || !isTopLevel() ) {
154 // update();
155 // if ( testWState(WState_AutoMask) )
156 // updateMask();
157 // setMicroFocusHint(width()/2, 0, 1, height(), FALSE);
158 // }
159
160 // QWidget::update() calls repaint(), which causes paintGL() to be
161 // invoked on all focus-in and focus-out events.
162 }
163
164 // See doc on focusInEvent() above.
165 void
focusOutEvent(QFocusEvent * e)166 SoQtGLArea::focusOutEvent(QFocusEvent * e)
167 {
168 }
169
170 // *************************************************************************
171
172 bool
event(QEvent * e)173 SoQtGLArea::event(QEvent * e)
174 {
175 if ((e->type() == QEvent::KeyPress) || (e->type() == QEvent::KeyRelease)) {
176 if (this->keycb) {
177 QKeyEvent * ke = (QKeyEvent *)e;
178 this->keycb(ke, this->keycbuserdata);
179 ke->accept();
180 return TRUE;
181 }
182 }
183
184 // The following is a workaround for what may be a Qt bug (or at
185 // least very peculiar behavior).
186 //
187 // In a Qt MDI application, with multiple windows, each containing a
188 // SoQtExaminerViewer, use of the mousewheel over a viewer that
189 // doesn't have the focus causes wheel events to end up in both the
190 // viewer under the mouse and the viewer that has the focus.
191 //
192 // Our workaround is thus to ignore a wheel event when the widget
193 // doesn't have the focus.
194 //
195 // Problem found with Win2000 and Qt 3.3.2.
196 if (e->type() == QEvent::Wheel && ! this->hasFocus()) { return FALSE; }
197
198 return QGLWidget::event(e);
199 }
200
201 // *************************************************************************
202