cgit.sxemacs.org Git - harmattan/cameraplus/blob - lib/qtcamgraphicsviewfinder.cpp

   1 #include "qtcamgraphicsviewfinder.h"
   2 #include "qtcamconfig.h"
   3 #include "qtcamdevice.h"
   4 #include <QDebug>
   5 #include "qtcamviewfinderrenderer.h"
   6 #include <QPainter>
   7 #include <QGraphicsSceneResizeEvent>
   8
   9 class QtCamGraphicsViewfinderPrivate {
  10 public:
  11   void ensureBackend() {
  12     if (!renderer) {
  13       renderer = QtCamViewfinderRenderer::create(conf, q_ptr);
  14       renderer->resize(q_ptr->size());
  15       QObject::connect(renderer, SIGNAL(updateRequested()), q_ptr, SLOT(updateRequested()));
  16     }
  17   }
  18
  19   void resetBackend() {
  20     if (renderer) {
  21       renderer->reset();
  22     }
  23   }
  24
  25   QtCamViewfinderRenderer *renderer;
  26   QtCamConfig *conf;
  27   QtCamDevice *dev;
  28   QtCamGraphicsViewfinder *q_ptr;
  29 };
  30
  31 QtCamGraphicsViewfinder::QtCamGraphicsViewfinder(QtCamConfig *config, QGraphicsItem *parent) :
  32   QGraphicsWidget(parent), d_ptr(new QtCamGraphicsViewfinderPrivate) {
  33   d_ptr->conf = config;
  34   d_ptr->dev = 0;
  35   d_ptr->renderer = 0;
  36   d_ptr->q_ptr = this;
  37 }
  38
  39 QtCamGraphicsViewfinder::~QtCamGraphicsViewfinder() {
  40   delete d_ptr; d_ptr = 0;
  41 }
  42
  43 GstElement *QtCamGraphicsViewfinder::sinkElement() {
  44   d_ptr->ensureBackend();
  45
  46   return d_ptr->renderer->sinkElement();
  47 }
  48
  49 bool QtCamGraphicsViewfinder::setDevice(QtCamDevice *device) {
  50   if (device && d_ptr->dev == device) {
  51     return true;
  52   }
  53
  54   if (d_ptr->dev) {
  55     qWarning() << "QtCamGraphicsViewfinder: viewfinder cannot be replaced.";
  56     return false;
  57   }
  58
  59   if (!device) {
  60     qWarning() << "QtCamGraphicsViewfinder: viewfinder cannot be unset.";
  61     return false;
  62   }
  63
  64   // This is to break the loop.
  65   d_ptr->dev = device;
  66   if (!device->setViewfinder(this)) {
  67     d_ptr->dev = 0;
  68     return false;
  69   }
  70
  71   d_ptr->resetBackend();
  72
  73   return true;
  74 }
  75
  76 void QtCamGraphicsViewfinder::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
  77                                     QWidget *widget) {
  78   Q_UNUSED(widget);
  79   Q_UNUSED(option);
  80
  81   painter->fillRect(boundingRect(), Qt::black);
  82
  83   if (!d_ptr->renderer) {
  84     return;
  85   }
  86
  87   d_ptr->renderer->paint(painter);
  88 }
  89
  90 void QtCamGraphicsViewfinder::resizeEvent(QGraphicsSceneResizeEvent *event) {
  91   QGraphicsWidget::resizeEvent(event);
  92
  93   if (!d_ptr->renderer) {
  94     return;
  95   }
  96
  97   d_ptr->renderer->resize(event->newSize());
  98 }
  99
 100 void QtCamGraphicsViewfinder::updateRequested() {
 101   update();
 102 }