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Thread: [SOLVED] QMainWindow, QGLWidget - problems with QKeyEvents

  1. 21st November 2008, 04:25 #1
    xerionn
    xerionn is offline Novice
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    Post [SOLVED] QMainWindow, QGLWidget - problems with QKeyEvents

    Hey everyone,
    I am new to Qt and especially OpenGL...So here is my question.
    If i sublass QMainWindow to create main window with menus and status bar that also contains one and only centralwidget (a QGLWidget to be more specific) i cant grab of the events from that QGLWidget.
    If i just show the widget and dont use QMainWindow everything is ok !
    Any help ?

    mainwindow.h
    Qt Code: 
    1. #ifndef WINDOW_H
    2. #define WINDOW_H
    3.  
    4. #include <QtGui/QMainWindow>
    5. #include <QWidget>
    6.  
    7. class GLWidget;
    8. class QAction;
    9. class QMenu;
    10.  
    11. class Window : public QMainWindow
    12. {
    13. 	Q_OBJECT
    14.  
    15. public:
    16. 	Window();
    17.  
    18. private slots:
    19. void about();
    20.  
    21. private:
    22. 	void createActions();
    23. 	void createMenus();
    24. 	void createStatusBar();
    25.  
    26. 	QMenu *fileMenu;
    27. 	QMenu *helpMenu;
    28.  
    29. 	QAction *exitAction;
    30. 	QAction *aboutAction;
    31. 	QAction *aboutQtAction;
    32.  
    33. 	GLWidget *glWidget;
    34.  
    35. };
    36.  
    37. #endif
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    mainwindow.cpp
    Qt Code: 
    1. #include <QtGui>
    2. #include "mainwindow.h"
    3. #include "glwidget.h"
    4.  
    5. Window::Window()
    6. {
    7. 	glWidget = new GLWidget;
    8. 	setCentralWidget(glWidget);
    9.  
    10. 	createActions();
    11. 	createMenus();
    12. 	createStatusBar();
    13.  
    14. 	setWindowTitle(tr("Blank OpenGL Environment"));
    15. }
    16.  
    17. void Window::createActions()
    18. {
    19. 	exitAction = new QAction(tr("E&xit"), this);
    20. 	exitAction->setShortcut(tr("Ctrl+Q"));
    21. 	exitAction->setStatusTip(tr("Exit the application"));
    22. 	connect(exitAction, SIGNAL(triggered()), qApp, SLOT(closeAllWindows()));
    23.  
    24. 	aboutAction = new QAction(tr("&About"), this);
    25. 	aboutAction->setStatusTip(tr("Show the application's About box"));
    26. 	connect(aboutAction, SIGNAL(triggered()), this, SLOT(about()));
    27.  
    28. 	aboutQtAction = new QAction(tr("About &Qt"), this);
    29. 	aboutQtAction->setStatusTip(tr("Show the Qt library's About box"));
    30. 	connect(aboutQtAction, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
    31. }
    32.  
    33. void Window::createMenus()
    34. {
    35. 	fileMenu = menuBar()->addMenu(tr("&File"));
    36. 	fileMenu->addAction(exitAction);
    37.  
    38. 	helpMenu = menuBar()->addMenu(tr("&Help"));
    39. 	helpMenu->addAction(aboutAction);
    40. 	helpMenu->addAction(aboutQtAction);
    41. }
    42.  
    43. void Window::createStatusBar()
    44. {
    45. 	statusBar()->showMessage(tr("Ready"));
    46. }
    47.  
    48. void Window::about()
    49. {
    50. 	QMessageBox::about(this, tr("About OpenGL"),
    51. 			tr("<h2>OpenGL Learning</h2>"
    52. 					"<p>Copyright &copy;2008 xerion :D"));
    53. }
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    Now lets move to glwidget.h
    Qt Code: 
    1. #ifndef GLWIDGET_H
    2. #define GLWIDGET_H
    3.  
    4. #include <QGLWidget>
    5.  
    6. class QTimer;
    7.  
    8. class GLWidget : public QGLWidget
    9. {
    10. 	Q_OBJECT
    11.  
    12. public:
    13. 	GLWidget(QWidget *parent=0);
    14. 	~GLWidget();
    15.  
    16. 	public slots:
    17. 		void timeOutSlot();
    18.  
    19. protected:
    20. 	void initializeGL();
    21. 	void paintGL();
    22. 	void resizeGL(int width, int height);
    23. 	void timeOut();
    24. 	void keyPressEvent(QKeyEvent *e);
    25.  
    26. private:
    27. 	void makeObject();
    28. 	void loadGLTextures();
    29.  
    30. 	QTimer *m_timer;
    31.  
    32. 	GLfloat rotx, roty;
    33. 	GLfloat z;
    34. 	GLfloat drotx, droty;
    35.  
    36. 	GLfloat LightAmbient[4];
    37. 	GLfloat LightDiffuse[4];
    38. 	GLfloat LightPosition[4];
    39.  
    40. 	bool light;	
    41. 	GLuint  filter;	
    42. 	GLuint  texture[3];
    43. };
    44.  
    45. #endif
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    Qt Code: 
    1. #include <QtGui>
    2. #include <QtOpenGL>
    3. #include <math.h>
    4. #include "glwidget.h"
    5. #include <qapplication.h>
    6. #include <qtimer.h>
    7.  
    8. //constructor
    9. GLWidget::GLWidget(QWidget *parent)
    10. : QGLWidget(parent)
    11. {
    12. 	m_timer = new QTimer( this );
    13. 	connect( m_timer, SIGNAL(timeout()), this, SLOT(timeOutSlot()) );
    14. 	m_timer->start( 50 );
    15.  
    16. 	LightAmbient[0]=  0.5f;
    17. 	LightAmbient[1]= 0.5f;
    18. 	LightAmbient[2]=  0.5f;
    19. 	LightAmbient[3]=	 1.0f;
    20.  
    21. 	LightDiffuse[0]= 1.0f;
    22. 	LightDiffuse[1]= 1.0f;
    23. 	LightDiffuse[2]= 1.0f;
    24. 	LightDiffuse[3]= 1.0f;
    25.  
    26. 	LightPosition[0]= 0.0f;
    27. 	LightPosition[1]=0.0f;
    28. 	LightPosition[2]=2.0f;
    29. 	LightPosition[3]=1.0f;
    30.  
    31. 	rotx = roty = 0.0f;
    32. 	z = -5.0f;
    33. 	drotx = droty = 0.0f;
    34. 	filter = 0;
    35. 	light = true;
    36. }
    37.  
    38. //destructor
    39. GLWidget::~GLWidget()
    40. {
    41. 	makeCurrent();
    42. }
    43.  
    44. void GLWidget::initializeGL()
    45. {
    46. 	loadGLTextures();
    47.  
    48. 	glEnable(GL_TEXTURE_2D);
    49. 	glShadeModel(GL_SMOOTH);
    50.  
    51. 	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    52. 	glClearDepth(1.0f);
    53.  
    54. 	glEnable(GL_DEPTH_TEST);
    55. 	glDepthFunc(GL_LEQUAL);
    56.  
    57. 	glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
    58.  
    59. 	glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient);
    60. 	glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse); 
    61. 	glLightfv(GL_LIGHT1, GL_POSITION,LightPosition);
    62. 	glEnable(GL_LIGHT1);
    63.  
    64. }
    65.  
    66. void GLWidget::resizeGL( int width, int height )
    67. {
    68. 	height = height?height:1;
    69.  
    70. 	glViewport( 0, 0, (GLint)width, (GLint)height );
    71.  
    72. 	glMatrixMode(GL_PROJECTION);
    73. 	glLoadIdentity();
    74. 	gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f);
    75.  
    76. 	glMatrixMode(GL_MODELVIEW);
    77. 	glLoadIdentity();
    78. }
    79.  
    80. void GLWidget::paintGL()
    81. {
    82. 	glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); 
    83. 	glLoadIdentity();				
    84.  
    85. 	makeObject();  //create our object
    86. }
    87.  
    88. void GLWidget::makeObject()
    89. {	
    90. 	glTranslatef(0.0f,0.0f,z);
    91.  
    92. 	glRotatef(rotx,1.0f,0.0f,0.0f);
    93. 	glRotatef(roty,0.0f,1.0f,0.0f);
    94.  
    95. 	glBindTexture(GL_TEXTURE_2D, texture[filter]);  
    96.  
    97. 	glBegin(GL_QUADS);
    98. 	// Front Face
    99. 	glNormal3f( 0.0f, 0.0f, 1.0f);
    100. 	glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
    101. 	glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
    102. 	glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
    103. 	glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
    104. 	// Back Face
    105. 	glNormal3f( 0.0f, 0.0f,-1.0f);
    106. 	glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
    107. 	glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);
    108. 	glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);
    109. 	glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
    110. 	// Top Face
    111. 	glNormal3f( 0.0f, 1.0f, 0.0f);
    112. 	glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);
    113. 	glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
    114. 	glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
    115. 	glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);
    116. 	// Bottom Face
    117. 	glNormal3f( 0.0f,-1.0f, 0.0f);
    118. 	glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
    119. 	glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
    120. 	glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
    121. 	glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
    122. 	// Right face
    123. 	glNormal3f( 1.0f, 0.0f, 0.0f);
    124. 	glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
    125. 	glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);
    126. 	glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
    127. 	glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
    128. 	// Left Face
    129. 	glNormal3f(-1.0f, 0.0f, 0.0f);
    130. 	glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
    131. 	glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
    132. 	glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
    133. 	glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);
    134. 	glEnd(); 
    135. }
    136.  
    137. void GLWidget::timeOutSlot()
    138. {
    139. 	timeOut();
    140. }
    141.  
    142. void GLWidget::timeOut()
    143. {
    144. 	rotx+=drotx;
    145. 	roty+=droty;
    146.  
    147. 	updateGL();
    148. }
    149.  
    150. void GLWidget::loadGLTextures()
    151. {
    152. 	QImage t;
    153. 	QImage b;
    154.  
    155. 	if ( !b.load( "../images/crate.bmp" ) )
    156. 	{
    157. 		b = QImage( 16, 16, QImage::Format_ARGB32 );
    158. 		b.fill( Qt::green);
    159. 	}
    160.  
    161. 	t = QGLWidget::convertToGLFormat( b );
    162. 	glGenTextures( 3, &texture[0] );
    163.  
    164. 	glBindTexture( GL_TEXTURE_2D, texture[0] );
    165. 	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
    166. 	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
    167. 	glTexImage2D( GL_TEXTURE_2D, 0, 3, t.width(), t.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, t.bits() );
    168.  
    169. 	glBindTexture(GL_TEXTURE_2D, texture[1]);
    170. 	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
    171. 	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
    172. 	glTexImage2D( GL_TEXTURE_2D, 0, 3, t.width(), t.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, t.bits() );
    173.  
    174. 	glBindTexture(GL_TEXTURE_2D, texture[2]);
    175. 	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
    176. 	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST);
    177. 	gluBuild2DMipmaps(GL_TEXTURE_2D, 3, t.width(), t.height(), GL_RGBA, GL_UNSIGNED_BYTE, t.bits());
    178. }
    179.  
    180. void GLWidget::keyPressEvent( QKeyEvent *e )
    181. {
    182. 	switch( e->key() )
    183. 	{
    184. 	case Qt::Key_L:
    185. 		light = !light;
    186.  
    187. 		if( light )
    188. 			glEnable( GL_LIGHTING );
    189. 		else		
    190. 			glDisable( GL_LIGHTING );
    191.  
    192. 		break;
    193.  
    194. 	case Qt::Key_F:
    195. 		filter++;
    196. 		if( filter > 2 )
    197. 			filter = 0;
    198.  
    199. 		break;
    200.  
    201. 	case Qt::Key_Left:
    202. 		droty -= 0.01f;
    203.  
    204. 		break;
    205.  
    206. 	case Qt::Key_Right:
    207. 		droty += 0.01f;
    208.  
    209. 		break;
    210.  
    211. 	case Qt::Key_Up:
    212. 		drotx -= 0.01f;
    213.  
    214. 		break;
    215.  
    216. 	case Qt::Key_Down:
    217. 		drotx += 0.01f;
    218.  
    219. 		break;
    220.  
    221. 	case Qt::Key_PageDown:
    222. 		z -= 0.02f;
    223.  
    224. 		break;
    225.  
    226. 	case Qt::Key_PageUp:
    227. 		z += 0.02f;
    228.  
    229. 	case Qt::Key_Escape:
    230. 		close();
    231. 	}
    232. }
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    Last our main.cpp
    Qt Code: 
    1. #include <QApplication>
    2. #include <QtGui>
    3. #include "mainwindow.h"
    4.  
    5. int main(int argc, char *argv[])
    6. {
    7. 	QApplication app(argc, argv);
    8.  
    9. 	Window window;
    10. 	window.resize( 400, 350 );
    11. 	window.show();
    12. 	return app.exec();
    13. }
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    If i instead use this and dont use at all the mainwindow.h and mainwindow.cpp the QKey Evnts work

    Qt Code: 
    1. #include <QApplication>
    2. #include <QtGui>
    3. #include <QGLWidget>
    4. #include "glwidget.h"
    5.  
    6. int main(int argc, char *argv[])
    7. {
    8. 	QApplication app(argc, argv);
    9. 	QGLWidget *glWidget = new GLWidget;
    10. 	glWidget->show();
    11. 	return app.exec();
    12. }
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    So my question is why they dont work when i use QMainWindow
    Last edited by xerionn; 21st November 2008 at 07:03.
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  2. 21st November 2008, 07:00 #2
    xerionn
    xerionn is offline Novice
    Join Date
    Nov 2008
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    Platforms
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    Default Re: QMainWindow, QGLWidget - problems with QKeyEvents

    Duh Silly me, i had the setFocus to a wrong position !
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