Viadeo Twitter Google Bookmarks ! Facebook Digg del.icio.us MySpace Yahoo MyWeb Blinklist Netvouz Reddit Simpy StumbleUpon Bookmarks Windows Live Favorites 
Logo Documentation Qt ·  Page d'accueil  ·  Toutes les classes  ·  Toutes les fonctions  ·  Vues d'ensemble  · 

cameraexample.cpp Example File

demos/mobile/qcamera/cameraexample.cpp
 /****************************************************************************
 **
 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the demonstration applications of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "cameraexample.h"
 #include "messagehandling.h"
 #include "contactsdlg.h"
 #include "button.h"
 #include "businesscardhandling.h"
 #include <QDebug>

 /*****************************************************************************
 * MyVideoSurface
 */
 MyVideoSurface::MyVideoSurface(QWidget* widget, VideoIF* target, QObject* parent)
     : QAbstractVideoSurface(parent)
 {
     m_targetWidget = widget;
     m_target = target;
     m_imageFormat = QImage::Format_Invalid;
 }

 MyVideoSurface::~MyVideoSurface()
 {
 }

 bool MyVideoSurface::start(const QVideoSurfaceFormat &format)
 {
     m_videoFormat = format;
     const QImage::Format imageFormat = QVideoFrame::imageFormatFromPixelFormat(format.pixelFormat());
     const QSize size = format.frameSize();

     if (imageFormat != QImage::Format_Invalid && !size.isEmpty()) {
         m_imageFormat = imageFormat;
         QAbstractVideoSurface::start(format);
         return true;
     } else {
         return false;
     }
 }

 bool MyVideoSurface::present(const QVideoFrame &frame)
 {
     m_frame = frame;
     if (surfaceFormat().pixelFormat() != m_frame.pixelFormat() ||
             surfaceFormat().frameSize() != m_frame.size()) {
         stop();
         return false;
     } else {
         m_target->updateVideo();
         return true;
     }
 }

 void MyVideoSurface::paint(QPainter *painter)
  {
      if (m_frame.map(QAbstractVideoBuffer::ReadOnly)) {
          QImage image(
                  m_frame.bits(),
                  m_frame.width(),
                  m_frame.height(),
                  m_frame.bytesPerLine(),
                  m_imageFormat);

          QRect r = m_targetWidget->rect();
          QPoint centerPic((qAbs(r.size().width() - image.size().width())) / 2, (qAbs(
              r.size().height() - image.size().height())) / 2);

          if (!image.isNull()) {
             painter->drawImage(centerPic,image);
          }

          m_frame.unmap();
      }
  }

 QList<QVideoFrame::PixelFormat> MyVideoSurface::supportedPixelFormats(
             QAbstractVideoBuffer::HandleType handleType) const
 {
     if (handleType == QAbstractVideoBuffer::NoHandle) {
         return QList<QVideoFrame::PixelFormat>()
                 << QVideoFrame::Format_RGB32
                 << QVideoFrame::Format_ARGB32
                 << QVideoFrame::Format_ARGB32_Premultiplied
                 << QVideoFrame::Format_RGB565
                 << QVideoFrame::Format_RGB555;
     } else {
         return QList<QVideoFrame::PixelFormat>();
     }
 }

 /*****************************************************************************
 * CameraExample
 */
 CameraExample::CameraExample(QWidget *parent) :
     QMainWindow(parent)
 {
     setWindowTitle("QCameraExample");

     // Opitimizations for screen update and drawing qwidget
     setAutoFillBackground(false);

     // Prevent to screensaver to activate
     m_systemScreenSaver = new QSystemScreenSaver(this);
     m_systemScreenSaver->setScreenSaverInhibit();

     m_myVideoSurface = 0;
     pictureCaptured = false;
     showViewFinder = false;
     m_focusing = false;

     // MMS handling
     m_message = new Message(this);
     QObject::connect(m_message, SIGNAL(messageStateChanged(int)), this, SLOT(messageStateChanged(int)));
     QObject::connect(m_message, SIGNAL(messageReceived(QString,QString,QPixmap)), this, SLOT(messageReceived(QString,QString,QPixmap)));

     // Business card handling (Contact's avatar picture)
     m_businessCardHandling = new BusinessCardHandling(this);

     // Black background
     QPalette palette = this->palette();
     palette.setColor(QPalette::Background, Qt::black);
     setPalette(palette);

     // Main widget & layout
     QWidget* mainWidget = new QWidget(this);
     mainWidget->setPalette(palette);

     QHBoxLayout* hboxl = new QHBoxLayout;
     hboxl->setSpacing(0);
     hboxl->setMargin(0);

     // UI stack
     m_stackedWidget = new QStackedWidget();
     m_stackedWidget->setPalette(palette);

     // First widget to stack
     m_videoWidget = new QWidget();
     m_videoWidget->setPalette(palette);
     m_stackedWidget->addWidget(m_videoWidget);

     // Second widget to stack
     QWidget* secondWidget = new QWidget(this);
     secondWidget->setPalette(palette);
     m_stackedWidget->addWidget(secondWidget);
     m_stackedWidget->setCurrentIndex(0);

     hboxl->addWidget(m_stackedWidget);

     // Buttons
     QSize iconSize(80, 80);
     QVBoxLayout* vboxl = new QVBoxLayout;
     vboxl->setSpacing(0);
     vboxl->setMargin(0);

     // Exit button
     m_exit = new Button(this);
     QObject::connect(m_exit, SIGNAL(pressed()), qApp, SLOT(quit()));
     QPixmap p = QPixmap(":/icons/exit.png");
     m_exit->setPixmap(p.scaled(iconSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
     vboxl->addWidget(m_exit);
     vboxl->setAlignment(m_exit, Qt::AlignHCenter | Qt::AlignTop);

     // Camera button
     m_cameraBtn = new Button(this);
     QObject::connect(m_cameraBtn, SIGNAL(pressed()), this, SLOT(searchAndLock()));
     p = QPixmap(":/icons/camera.png");
     m_cameraBtn->setPixmap(p.scaled(iconSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
     vboxl->addWidget(m_cameraBtn);
     vboxl->setAlignment(m_cameraBtn, Qt::AlignCenter);

     // Send MMS button
     m_mms = new Button(this);
     QObject::connect(m_mms, SIGNAL(pressed()), this, SLOT(openContactsDlg()));
     p = QPixmap(":/icons/mms.png");
     m_mms->setPixmap(p.scaled(iconSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
     vboxl->addWidget(m_mms);
     vboxl->setAlignment(m_mms, Qt::AlignHCenter | Qt::AlignBottom);
 #ifndef MESSAGING_ENABLED
     m_mms->disableBtn(true);
     m_mms->setEnabled(false);
 #endif

     hboxl->addLayout(vboxl);
     mainWidget->setLayout(hboxl);

     setCentralWidget(mainWidget);

     // Enable camera after 1s, so that the application is started
     // and widget is created to landscape orientation
     QTimer::singleShot(1000,this,SLOT(enableCamera()));
 }

 CameraExample::~CameraExample()
 {
 if (m_myVideoSurface)
     m_myVideoSurface->stop();
     m_camera->stop();
     delete m_stackedWidget;
     delete m_stillImageCapture;
     delete m_camera;
 }

 void CameraExample::enableCamera()
 {
     m_camera = new QCamera();
     m_camera->setCaptureMode(QCamera::CaptureStillImage);
     connect(m_camera, SIGNAL(error(QCamera::Error)), this, SLOT(error(QCamera::Error)));
     connect(m_camera, SIGNAL(lockStatusChanged(QCamera::LockStatus,QCamera::LockChangeReason)), this, SLOT(lockStatusChanged(QCamera::LockStatus,QCamera::LockChangeReason)));

     // Own video output drawing that shows camera view finder pictures
     QMediaService* ms = m_camera->service();
     QVideoRendererControl* vrc = ms->requestControl<QVideoRendererControl*>();
     m_myVideoSurface = new MyVideoSurface(this,this,this);
     vrc->setSurface(m_myVideoSurface);
     // Image capturer
     m_stillImageCapture = new QCameraImageCapture(m_camera);
     connect(m_stillImageCapture, SIGNAL(imageCaptured(int,QImage)), this, SLOT(imageCaptured(int,QImage)));

     // Start camera
     if (m_camera->state() == QCamera::ActiveState) {
         m_camera->stop();
     }
     m_videoWidget->show();
     m_camera->start();
     showViewFinder = true;
 }

 void CameraExample::mousePressEvent(QMouseEvent *event)
 {
     QMainWindow::mousePressEvent(event);

     if (pictureCaptured) {
         // Starting view finder
         pictureCaptured = false;
         m_stackedWidget->setCurrentIndex(0);
         if (m_myVideoSurface) {
             showViewFinder = true;
         }
     }
 }

 void CameraExample::searchAndLock()
 {
     m_focusing = false;
     m_focusMessage.clear();

     if (pictureCaptured) {
         // Starting view finder again
         pictureCaptured = false;
         m_stackedWidget->setCurrentIndex(0);
         if (m_myVideoSurface) {
             showViewFinder = true;
         }
     }
     else {
         // Search and lock picture (=focus)
         if (m_camera->supportedLocks() & QCamera::LockFocus) {
             m_focusing = true;
             m_focusMessage = "Focusing...";
             m_camera->searchAndLock(QCamera::LockFocus);
         } else {
         // No focus functionality, take picture right away
             captureImage();
         }
     }
 }

 void CameraExample::lockStatusChanged(QCamera::LockStatus status, QCamera::LockChangeReason reason)
 {
     if (status == QCamera::Locked) {
         if (reason == QCamera::LockAcquired) {
             // Focus locked
             m_focusMessage.clear();
             m_focusing = false;
             // Capture new image
             captureImage();
             // Unlock camera
             m_camera->unlock();
         } else {
             if (m_focusing)
                 m_focusMessage = "No focus, try again";
         }
     } else if (status == QCamera::Unlocked && m_focusing) {
         m_focusMessage = "No focus, try again";
     }
 }

 void CameraExample::captureImage()
 {
     if (pictureCaptured) {
         // Starting view finder again
         pictureCaptured = false;
         m_stackedWidget->setCurrentIndex(0);
         showViewFinder = true;
     }
     else {
         // Capturing image
         showViewFinder = false;
         // Get picture location where to store captured images
         QString path(QDesktopServices::storageLocation(QDesktopServices::PicturesLocation));
         QDir dir(path);

         // Get next filename
         QStringList files = dir.entryList(QStringList() << "camera_*.jpg");
         int lastImage = 0;
         foreach ( QString fileName, files ) {
                 int imgNumber = fileName.mid(7, fileName.size() - 11).toInt();
                 lastImage = qMax(lastImage, imgNumber);
             }
         // Capture image
         if (m_stillImageCapture->isReadyForCapture()) {
             m_imageName = QString("camera_%1.jpg").arg(lastImage+1);
             m_stillImageCapture->capture(m_imageName);
         }
     }
 }

 void CameraExample::imageCaptured(int id, const QImage &preview)
 {
     showViewFinder = false;
     m_focusing = false;

     // Image captured, show it to the user
     m_stackedWidget->setCurrentIndex(1);

     // Get picture location
     QString path(QDesktopServices::storageLocation(QDesktopServices::PicturesLocation));
     m_imageName.prepend(path + "/");

     m_capturedImage = preview;

     // Set suitable size to the image
     QSize s = m_videoWidget->size();
     s = s - QSize(20, 20);
     m_capturedImage = m_capturedImage.scaled(s, Qt::KeepAspectRatio, Qt::SmoothTransformation);

     pictureCaptured = true;
     update();
 }

 void CameraExample::error(QCamera::Error e)
 {
     switch (e) {
     case QCamera::NoError:
     {
         break;
     }
     case QCamera::CameraError:
     {
         QMessageBox::warning(this, "QCameraExample", "General Camera error");
         break;
     }
     case QCamera::InvalidRequestError:
     {
         QMessageBox::warning(this, "QCameraExample", "Camera invalid request error");
         break;
     }
     case QCamera::ServiceMissingError:
     {
         QMessageBox::warning(this, "QCameraExample", "Camera service missing error");
         break;
     }
     case QCamera::NotSupportedFeatureError :
     {
         QMessageBox::warning(this, "QCameraExample", "Camera not supported error");
         break;
     }
     };
 }

 void CameraExample::openContactsDlg()
 {
     // Open dialog for showing contacts
     if (!m_contactsDialog) {

         if (m_capturedImage.isNull()) {
             QMessageBox::information(this, "QCameraExample", "Take picture first");
             return;
         }

         // Show dialog
         m_contactsDialog = new ContactsDialog(this);
         QObject::connect(m_contactsDialog, SIGNAL(contactSelected(QString)),
         this, SLOT(contactSelected(QString)));
         m_contactsDialog->exec();
         QObject::disconnect(m_contactsDialog, SIGNAL(contactSelected(QString)),
         this, SLOT(contactSelected(QString)));

         delete m_contactsDialog;
         m_contactsDialog = 0;
     }
 }

 void CameraExample::contactSelected(QString phoneNumber)
 {
     m_phoneNumber = phoneNumber;
     QTimer::singleShot(1000,this,SLOT(sendMMS()));
 }

 void CameraExample::sendMMS()
 {
 #ifdef MESSAGING_ENABLED
     m_message->sendMMS(m_imageName, m_phoneNumber);
 #endif
 }

 void CameraExample::messageStateChanged(int /*error*/)
 {
 }

 void CameraExample::updateVideo()
 {
     if (showViewFinder) {
         repaint();
     }
 }

 void CameraExample::paintEvent(QPaintEvent *event)
 {
     //QMainWindow::paintEvent(event);

     QPainter painter(this);
     QRect r = this->rect();

     QFont font = painter.font();
     font.setPixelSize(20);
     painter.setFont(font);
     painter.setPen(Qt::white);

     if (showViewFinder && m_myVideoSurface && m_myVideoSurface->isActive()) {
         // Show view finder
         m_myVideoSurface->paint(&painter);

         // Paint focus message
         if (!m_focusMessage.isEmpty())
             painter.drawText(r, Qt::AlignCenter, m_focusMessage);

     } else {
         // Draw black
         painter.fillRect(event->rect(), palette().background());
         // Show captured image
         if (pictureCaptured) {
             // Paint captured image
             QPoint centerPic((qAbs(r.size().width() - m_capturedImage.size().width())) / 2, (qAbs(
                 r.size().height() - m_capturedImage.size().height())) / 2);

             painter.drawImage(centerPic, m_capturedImage);

             // Paint filename
             painter.drawText(r, Qt::AlignBottom | Qt::AlignCenter, m_imageName);
         }
     }

 }

 void CameraExample::messageReceived(QString phoneNumber, QString filename, QPixmap pixmap)
 {
 #ifdef MESSAGING_ENABLED
     // MMS message received
     // Check that is came from some of our contact
     QContact contact;
     if (m_businessCardHandling->findContact(phoneNumber, contact)) {
         // Ask from user to store it as sender avatar picture into contacts
         if (QMessageBox::question(
             this,
             "QCameraExample",
             QString(
                 "MMS picture message received from %1. Do you want to store it as sender avatar picture?").arg(
                 contact.displayLabel()), QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes) {

             m_businessCardHandling->storeAvatarToContact(phoneNumber, filename, pixmap);
         }
     }
 #endif
 }
Publicité

Best Of

Actualités les plus lues

Semaine
Mois
Année
  1. Microsoft ouvre aux autres compilateurs C++ AMP, la spécification pour la conception d'applications parallèles C++ utilisant le GPU 22
  2. Les développeurs ignorent-ils trop les failles découvertes dans leur code ? Prenez-vous en compte les remarques des autres ? 17
  3. « Quelque chose ne va vraiment pas avec les développeurs "modernes" », un développeur à "l'ancienne" critique la multiplication des bibliothèques 17
  4. RIM : « 13 % des développeurs ont gagné plus de 100 000 $ sur l'AppWord », Qt et open-source au menu du BlackBerry DevCon Europe 0
  5. BlackBerry 10 : premières images du prochain OS de RIM qui devrait intégrer des widgets et des tuiles inspirées de Windows Phone 0
  6. Adieu qmake, bienvenue qbs : Qt Building Suite, un outil déclaratif et extensible pour la compilation de projets Qt 17
  7. Quelles nouveautés de C++11 Visual C++ doit-il rapidement intégrer ? Donnez-nous votre avis 10
Page suivante

Le blog Digia au hasard

Logo

Déploiement d'applications Qt Commercial sur les tablettes Windows 8

Le blog Digia est l'endroit privilégié pour la communication sur l'édition commerciale de Qt, où des réponses publiques sont apportées aux questions les plus posées au support. Lire l'article.

Communauté

Ressources

Liens utiles

Contact

  • Vous souhaitez rejoindre la rédaction ou proposer un tutoriel, une traduction, une question... ? Postez dans le forum Contribuez ou contactez-nous par MP ou par email (voir en bas de page).

Qt dans le magazine

Cette page est une traduction d'une page de la documentation de Qt, écrite par Nokia Corporation and/or its subsidiary(-ies). Les éventuels problèmes résultant d'une mauvaise traduction ne sont pas imputables à Nokia. Qt 4.7-snapshot
Copyright © 2012 Developpez LLC. Tous droits réservés Developpez LLC. Aucune reproduction, même partielle, ne peut être faite de ce site et de l'ensemble de son contenu : textes, documents et images sans l'autorisation expresse de Developpez LLC. Sinon, vous encourez selon la loi jusqu'à 3 ans de prison et jusqu'à 300 000 E de dommages et intérêts. Cette page est déposée à la SACD.
Vous avez déniché une erreur ? Un bug ? Une redirection cassée ? Ou tout autre problème, quel qu'il soit ? Ou bien vous désirez participer à ce projet de traduction ? N'hésitez pas à nous contacter ou par MP !
 
 
 
 
Partenaires

Hébergement Web