Can someone help me, I need to update window in QTOpenGL ( if I press F10 I want to zoom, or change X or Y, but it doesnt update )

Qt Code: 
  1. #include <QtGui/QApplication>
  2. #include "mainwindow.h"
  3. #include <QtOpenGL/QGLWidget>
  4. #include <QtGui/QMouseEvent>
  5. #include <GL/glu.h>
  6.  
  7. int cameraX, cameraY, cameraZ;
  8.  
  9. class GLWidget : public QGLWidget{
  10. public:
  11.     void initializeGL();
  12.     void resizeGL(int w, int h);
  13.     void paintGL();
  14.     void mousePressEvent(QMouseEvent *event);
  15.     void mouseMoveEvent(QMouseEvent *event);
  16.     void keyPressEvent(QKeyEvent *event);
  17. };
  18.  
  19. void GLWidget::initializeGL() {
  20.     glDisable(GL_TEXTURE_2D);
  21.     glDisable(GL_DEPTH_TEST);
  22.     glDisable(GL_COLOR_MATERIAL);
  23.     glEnable(GL_BLEND);
  24.     glEnable(GL_POLYGON_SMOOTH);
  25.     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  26.     glClearColor(3, 3, 3, 0);
  27.     cameraX = 0;
  28.     cameraY = 0;
  29.     cameraZ = 0;
  30. }
  31.  
  32. void GLWidget::resizeGL(int w, int h) {
  33.     glViewport(0, 0, w, h);
  34.     glMatrixMode(GL_PROJECTION);
  35.     glLoadIdentity();
  36.     gluOrtho2D(0, w, 0, h); // set origin to bottom left corner
  37.     glMatrixMode(GL_MODELVIEW);
  38.     glLoadIdentity();
  39. }
  40.  
  41. void GLWidget::paintGL() {
  42.     glClear(GL_COLOR_BUFFER_BIT);
  43.     glColor3f(5,0,0);
  44.     glTranslatef(cameraX, cameraY, cameraZ);
  45.     glBegin(GL_POLYGON);
  46.         glVertex2f(0,0);
  47.         glVertex2f(0,500);
  48.         glVertex2f(500,0);
  49.     glEnd();
  50. }
  51. void GLWidget::mousePressEvent(QMouseEvent *event) {
  52.  
  53. }
  54. void GLWidget::mouseMoveEvent(QMouseEvent *event) {
  55.     printf("%d, %d\n", event->x(), event->y());
  56. }
  57.  
  58. void GLWidget::keyPressEvent(QKeyEvent* event) {
  59.     switch(event->key()) {
  60.     case Qt::Key_Escape:
  61.         close();
  62.         break;
  63.     case Qt::Key_F10:
  64.         cameraX += 0.5f;
  65.         break;
  66.     default:
  67.         event->ignore();
  68.         break;
  69.     }
  70. }
  71. int main(int argc, char *argv[])
  72. {
  73.     QApplication a(argc, argv);
  74.     GLWidget window;
  75.     window.resizeGL(800, 600);
  76.     window.show();
  77.     a.exec();
  78. }
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Thanks!