FilePreview Class Reference

#include <addPhotosDialog.h>

Inheritance diagram for FilePreview:

Collaboration diagram for FilePreview:

Public Member Functions
	FilePreview (QWidget *parent=0)
	~FilePreview ()
QSize	minimumSizeHint () const
void	previewUrl (const Q3Url &)
	declared to make base class happy. we'll use an updatePreview function instead
void	updatePreview (const QString &path)
	call this function to update the file preview

Protected Member Functions
void	customEvent (QCustomEvent *e)
	handle update events that come from the GeneratePreviewThread

Private Attributes
QLabel *	filePreview
	preview of last selected file
QLabel *	fileDetails
	details about last selected file
GeneratePreviewThread *	generatorThread
	a worker thread that actually generates the file preview image and details information that is displayed.

Detailed Description

Definition at line 59 of file addPhotosDialog.h.

Constructor & Destructor Documentation

FilePreview()

FilePreview::FilePreview

(

QWidget *

parent = 0

)

Definition at line 176 of file addPhotosDialog.cpp.

                                        : QWidget(parent) 
{
  //create widgets for display preview image and details
  filePreview = new QLabel( this );  
  fileDetails = new QLabel( this );  
  
  Q3GridLayout* grid = new Q3GridLayout( this, 4, 3 );
  grid->setRowStretch( 0, 1 );
  grid->addWidget( filePreview, 1, 1, Qt::AlignHCenter );
  grid->addWidget( fileDetails, 2, 1, Qt::AlignHCenter );
  grid->setRowStretch( 3, 1 );
 
  grid->setColStretch( 0, 1 );
  grid->setColStretch( 2, 1 );
 
  //create a generator thread that will be used for actually generating 
  //preview images and constructing details strings
  generatorThread = new GeneratePreviewThread(this);
}

References fileDetails, filePreview, and generatorThread.

~FilePreview()

FilePreview::~FilePreview

(

)

Definition at line 196 of file addPhotosDialog.cpp.

{
  //make sure generator thread is done!
  generatorThread->wait();
  delete generatorThread;
  generatorThread = NULL;
}

References generatorThread.

Member Function Documentation

customEvent()

void FilePreview::customEvent ( QCustomEvent * e )

protected

handle update events that come from the GeneratePreviewThread

Definition at line 210 of file addPhotosDialog.cpp.

{
  //handle UpdatePrevewEvents that are sent from the worker thread
  //by update the preview image and details that are shown
  if ( e->type() == UPDATE_PREVIEW_DETAILS ) 
  {  
    UpdatePreviewEvent* upe = (UpdatePreviewEvent*)e;
 
    if( !upe->getImage().isNull() )
    {
      QPixmap scaledPixmap;
      scaledPixmap.convertFromImage( upe->getImage() );
      filePreview->setPixmap( scaledPixmap );
    }
    
    fileDetails->setText( upe->getDetails() );
  }
}

References fileDetails, filePreview, UpdatePreviewEvent::getDetails(), UpdatePreviewEvent::getImage(), and UPDATE_PREVIEW_DETAILS.

minimumSizeHint()

QSize FilePreview::minimumSizeHint

(

)

const

Definition at line 204 of file addPhotosDialog.cpp.

{
  QFontMetrics fm( font() );
  return QSize(MIN_WIDTH, MIN_HEIGHT + 2*fm.height() );
}

References MIN_HEIGHT, and MIN_WIDTH.

previewUrl()

void FilePreview::previewUrl ( const Q3Url & )

inline

declared to make base class happy. we'll use an updatePreview function instead

Definition at line 67 of file addPhotosDialog.h.

{}

updatePreview()

void FilePreview::updatePreview

(

const QString &

path

)

call this function to update the file preview

Definition at line 229 of file addPhotosDialog.cpp.

{
  //handle requests to update the preview information by asking
  //the generator thread to handle them. by using
  //an auxiallary thread we can process requests very quickly while
  //any current work being done to generate an image preview continues
  if( generatorThread != NULL)
  {
    generatorThread->start( filename );
  }
}

References generatorThread, and GeneratePreviewThread::start().

Referenced by AddPhotosDialog::updatePreview().

Member Data Documentation

fileDetails

QLabel* FilePreview::fileDetails

private

details about last selected file

Definition at line 81 of file addPhotosDialog.h.

Referenced by customEvent(), and FilePreview().

filePreview

QLabel* FilePreview::filePreview

private

preview of last selected file

Definition at line 78 of file addPhotosDialog.h.

Referenced by customEvent(), and FilePreview().

generatorThread

GeneratePreviewThread* FilePreview::generatorThread

private

a worker thread that actually generates the file preview image and details information that is displayed.

Definition at line 86 of file addPhotosDialog.h.

Referenced by FilePreview(), updatePreview(), and ~FilePreview().

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

• addPhotosDialog.h
• addPhotosDialog.cpp