LoadImageFromUrl Class Reference

Load QImage from url. This is trivial for a file, but requires an asynchronous download step for http urls. More...

#include <LoadImageFromUrl.h>

Inheritance diagram for LoadImageFromUrl:

Collaboration diagram for LoadImageFromUrl:

Signals
void	signalImportImage (QString, QImage)
	Send the imported image to MainWindow. This completes the asynchronous loading of the image.

Public Member Functions
	LoadImageFromUrl (MainWindow &mainWindow)
	Single constructor.
	~LoadImageFromUrl ()
void	startLoadImage (const UrlDirty &url)
	Start the asynchronous loading of an image from the specified url.

Detailed Description

Load QImage from url. This is trivial for a file, but requires an asynchronous download step for http urls.

Definition at line 21 of file LoadImageFromUrl.h.

Constructor & Destructor Documentation

LoadImageFromUrl()

LoadImageFromUrl::LoadImageFromUrl

(

MainWindow &

mainWindow

)

Single constructor.

Definition at line 19 of file LoadImageFromUrl.cpp.

                                                          :
  m_mainWindow (mainWindow),
#ifdef NETWORKING
  m_http (this),
  m_reply (nullptr),
#endif
  m_buffer (nullptr)
{
  connect (this, SIGNAL (signalImportImage (QString, QImage)), &m_mainWindow, SLOT (slotFileImportImage (QString, QImage)));
}

~LoadImageFromUrl()

LoadImageFromUrl::~LoadImageFromUrl

(

)

Definition at line 30 of file LoadImageFromUrl.cpp.

{
  deallocate ();
}

Member Function Documentation

signalImportImage

void LoadImageFromUrl::signalImportImage ( QString , QImage  )

signal

Send the imported image to MainWindow. This completes the asynchronous loading of the image.

startLoadImage()

void LoadImageFromUrl::startLoadImage

(

const UrlDirty &

url

)

Start the asynchronous loading of an image from the specified url.

Definition at line 75 of file LoadImageFromUrl.cpp.

{
  LOG4CPP_INFO_S ((*mainCat)) << "LoadImageFromUrl::startLoadImage url=" << url.toString ().toLatin1 ().data ();
 
  m_url = url;
  if (url.isLocalFile ()) {
 
    QFileInfo fileInfo (url.toLocalFile ());
 
    // Load local file. This is done synchronously
    QImage image;
    if (image.load (url.toLocalFile ())) {
 
      emit signalImportImage (fileInfo.fileName (),
                              image);
 
    } else {
 
      // Probably a bad file type
 
      QString message;
      QTextStream str (&message);
 
      str << tr ("Unable to load image from") << " " << url.toLocalFile ();
 
      QMessageBox::critical (&m_mainWindow,
                             engaugeWindowTitle(),
                             message,
                             QMessageBox::Ok);
    }
 
  } else {
 
    // Drop on the floor if networking is not enabled
#ifdef NETWORKING
    // Asynchronous read from url
    deallocate ();
    m_buffer = new QByteArray;
    QNetworkRequest request (url);
    m_reply = m_http.get (request);
 
    connect (m_reply, SIGNAL (readyRead()), this, SLOT (slotReadData()));
    connect (m_reply, SIGNAL (finished ()), this, SLOT (slotFinished ()));
#endif
  }
}

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The documentation for this class was generated from the following files:

• Load/LoadImageFromUrl.h
• Load/LoadImageFromUrl.cpp