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       if (!renderer) {
  15         qCritical() << "Failed to create a viewfinder renderer";
  16         return;
  17       }
  18
  19       renderer->resize(q_ptr->size());
  20       QObject::connect(renderer, SIGNAL(updateRequested()), q_ptr, SLOT(updateRequested()));
  21     }
  22   }
  23
  24   void resetBackend() {
  25     if (renderer) {
  26       renderer->reset();
  27     }
  28   }
  29
  30   QtCamViewfinderRenderer *renderer;
  31   QtCamConfig *conf;
  32   QtCamDevice *dev;
  33   QtCamGraphicsViewfinder *q_ptr;
  34 };
  35
  36 QtCamGraphicsViewfinder::QtCamGraphicsViewfinder(QtCamConfig *config, QGraphicsItem *parent) :
  37   QGraphicsWidget(parent), d_ptr(new QtCamGraphicsViewfinderPrivate) {
  38   d_ptr->conf = config;
  39   d_ptr->dev = 0;
  40   d_ptr->renderer = 0;
  41   d_ptr->q_ptr = this;
  42 }
  43
  44 QtCamGraphicsViewfinder::~QtCamGraphicsViewfinder() {
  45   delete d_ptr; d_ptr = 0;
  46 }
  47
  48 GstElement *QtCamGraphicsViewfinder::sinkElement() {
  49   d_ptr->ensureBackend();
  50
  51   if (!d_ptr->renderer) {
  52     return 0;
  53   }
  54
  55   return d_ptr->renderer->sinkElement();
  56 }
  57
  58 bool QtCamGraphicsViewfinder::setDevice(QtCamDevice *device) {
  59   if (device && d_ptr->dev == device) {
  60     return true;
  61   }
  62
  63   if (d_ptr->dev) {
  64     qWarning() << "QtCamGraphicsViewfinder: viewfinder cannot be replaced.";
  65     return false;
  66   }
  67
  68   if (!device) {
  69     qWarning() << "QtCamGraphicsViewfinder: viewfinder cannot be unset.";
  70     return false;
  71   }
  72
  73   // This is to break the loop.
  74   d_ptr->dev = device;
  75   if (!device->setViewfinder(this)) {
  76     d_ptr->dev = 0;
  77     return false;
  78   }
  79
  80   d_ptr->resetBackend();
  81
  82   return true;
  83 }
  84
  85 void QtCamGraphicsViewfinder::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
  86                                     QWidget *widget) {
  87   Q_UNUSED(widget);
  88   Q_UNUSED(option);
  89
  90   painter->fillRect(boundingRect(), Qt::black);
  91
  92   if (!d_ptr->renderer) {
  93     return;
  94   }
  95
  96   d_ptr->renderer->paint(painter);
  97 }
  98
  99 void QtCamGraphicsViewfinder::resizeEvent(QGraphicsSceneResizeEvent *event) {
 100   QGraphicsWidget::resizeEvent(event);
 101
 102   if (!d_ptr->renderer) {
 103     return;
 104   }
 105
 106   d_ptr->renderer->resize(event->newSize());
 107 }
 108
 109 void QtCamGraphicsViewfinder::updateRequested() {
 110   update();
 111 }