KIO::PreviewJob Class Reference

#include <previewjob.h>

Inheritance diagram for KIO::PreviewJob:

Public Types
enum	ScaleType { Unscaled, Scaled, ScaledAndCached }
Public Types inherited from KCompositeJob
enum	Capability
enum	KillVerbosity
enum	Unit

Signals
void	failed (const KFileItem &item)
void	gotPreview (const KFileItem &item, const QPixmap &preview)
Signals inherited from KIO::Job
void	canceled (KJob *job)
void	connected (KIO::Job *job)
Signals inherited from KCompositeJob
void	description (KJob *job, const QString &title, const QPair< QString, QString > &field1=qMakePair(QString(), QString()), const QPair< QString, QString > &field2=qMakePair(QString(), QString()))
void	finished (KJob *job)
void	infoMessage (KJob *job, const QString &plain, const QString &rich=QString())
void	percent (KJob *job, unsigned long percent)
void	processedAmount (KJob *job, KJob::Unit unit, qulonglong amount)
void	processedSize (KJob *job, qulonglong size)
void	result (KJob *job)
void	resumed (KJob *job)
void	speed (KJob *job, unsigned long speed)
void	suspended (KJob *job)
void	totalAmount (KJob *job, KJob::Unit unit, qulonglong amount)
void	totalSize (KJob *job, qulonglong size)
void	warning (KJob *job, const QString &plain, const QString &rich=QString())

Public Member Functions
	PreviewJob (const KFileItemList &items, int width, int height, int iconSize, int iconAlpha, bool scale, bool save, const QStringList *enabledPlugins)
	PreviewJob (const KFileItemList &items, const QSize &size, const QStringList *enabledPlugins=0)
virtual	~PreviewJob ()
int	overlayIconAlpha () const
int	overlayIconSize () const
void	removeItem (const KUrl &url)
ScaleType	scaleType () const
int	sequenceIndex () const
void	setIgnoreMaximumSize (bool ignoreSize=true)
void	setOverlayIconAlpha (int alpha)
void	setOverlayIconSize (int size)
void	setScaleType (ScaleType type)
void	setSequenceIndex (int index)
Public Member Functions inherited from KIO::Job
virtual	~Job ()
void	addMetaData (const QString &key, const QString &value)
void	addMetaData (const QMap< QString, QString > &values)
QStringList	detailedErrorStrings (const KUrl *reqUrl=0L, int method=-1) const
QString	errorString () const
bool	isInteractive () const
void	mergeMetaData (const QMap< QString, QString > &values)
MetaData	metaData () const
MetaData	outgoingMetaData () const
Job *	parentJob () const
QString	queryMetaData (const QString &key)
void	setMetaData (const KIO::MetaData &metaData)
void	setParentJob (Job *parentJob)
void	showErrorDialog (QWidget *parent=0)
void	start ()
JobUiDelegate *	ui () const
Public Member Functions inherited from KCompositeJob
	KCompositeJob (QObject *parent=0)
virtual	~KCompositeJob ()
virtual	~KJob ()
Capabilities	capabilities () const
int	error () const
QString	errorText () const
bool	exec ()
bool	isAutoDelete () const
bool	isSuspended () const
	KJob (QObject *parent=0)
unsigned long	percent () const
qulonglong	processedAmount (Unit unit) const
void	setAutoDelete (bool autodelete)
void	setUiDelegate (KJobUiDelegate *delegate)
qulonglong	totalAmount (Unit unit) const
KJobUiDelegate *	uiDelegate () const
Public Member Functions inherited from QObject
	QObject (QObject *parent)
	QObject (QObject *parent, const char *name)
virtual	~QObject ()
bool	blockSignals (bool block)
QObject *	child (const char *objName, const char *inheritsClass, bool recursiveSearch) const
const QObjectList &	children () const
const char *	className () const
bool	connect (const QObject *sender, const char *signal, const char *method, Qt::ConnectionType type) const
void	deleteLater ()
void	destroyed (QObject *obj)
bool	disconnect (const QObject *receiver, const char *method)
bool	disconnect (const char *signal, const QObject *receiver, const char *method)
void	dumpObjectInfo ()
void	dumpObjectTree ()
QList< QByteArray >	dynamicPropertyNames () const
virtual bool	event (QEvent *e)
virtual bool	eventFilter (QObject *watched, QEvent *event)
T	findChild (const QString &name) const
QList< T >	findChildren (const QRegExp &regExp) const
QList< T >	findChildren (const QString &name) const
bool	inherits (const char *className) const
void	insertChild (QObject *object)
void	installEventFilter (QObject *filterObj)
bool	isA (const char *className) const
bool	isWidgetType () const
void	killTimer (int id)
virtual const QMetaObject *	metaObject () const
void	moveToThread (QThread *targetThread)
const char *	name () const
const char *	name (const char *defaultName) const
QString	objectName () const
QObject *	parent () const
QVariant	property (const char *name) const
void	removeChild (QObject *object)
void	removeEventFilter (QObject *obj)
void	setName (const char *name)
void	setObjectName (const QString &name)
void	setParent (QObject *parent)
bool	setProperty (const char *name, const QVariant &value)
bool	signalsBlocked () const
int	startTimer (int interval)
QThread *	thread () const

Static Public Member Functions
static QStringList	availablePlugins ()
static KIO::filesize_t	maximumFileSize ()
static QStringList	supportedMimeTypes ()
Static Public Member Functions inherited from QObject
bool	connect (const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type)
bool	connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type)
bool	disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *method)
bool	disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method)
QString	tr (const char *sourceText, const char *disambiguation, int n)
QString	trUtf8 (const char *sourceText, const char *disambiguation, int n)

Protected Slots
virtual void	slotResult (KJob *job)
Protected Slots inherited from KCompositeJob
virtual void	slotInfoMessage (KJob *job, const QString &plain, const QString &rich)
virtual void	slotResult (KJob *job)

Additional Inherited Members
Public Slots inherited from KCompositeJob
bool	kill (KillVerbosity verbosity=Quietly)
bool	resume ()
bool	suspend ()
Protected Member Functions inherited from KIO::Job
	Job ()
	Job (JobPrivate &dd)
virtual bool	addSubjob (KJob *job)
virtual bool	doKill ()
virtual bool	doResume ()
virtual bool	doSuspend ()
virtual bool	removeSubjob (KJob *job)
Protected Member Functions inherited from KCompositeJob
	KCompositeJob (KCompositeJobPrivate &dd, QObject *parent)
void	clearSubjobs ()
void	emitPercent (qulonglong processedAmount, qulonglong totalAmount)
void	emitResult ()
void	emitSpeed (unsigned long speed)
bool	hasSubjobs ()
	KJob (KJobPrivate &dd, QObject *parent)
void	setCapabilities (Capabilities capabilities)
void	setError (int errorCode)
void	setErrorText (const QString &errorText)
void	setPercent (unsigned long percentage)
void	setProcessedAmount (Unit unit, qulonglong amount)
void	setTotalAmount (Unit unit, qulonglong amount)
const QList< KJob * > &	subjobs () const
Protected Member Functions inherited from QObject
bool	checkConnectArgs (const char *signal, const QObject *object, const char *method)
virtual void	childEvent (QChildEvent *event)
virtual void	connectNotify (const char *signal)
virtual void	customEvent (QEvent *event)
virtual void	disconnectNotify (const char *signal)
int	receivers (const char *signal) const
QObject *	sender () const
int	senderSignalIndex () const
virtual void	timerEvent (QTimerEvent *event)
Static Protected Member Functions inherited from QObject
QByteArray	normalizeSignalSlot (const char *signalSlot)
Protected Attributes inherited from KCompositeJob
KJobPrivate *const	d_ptr
Properties inherited from QObject
	objectName

Detailed Description

KIO Job to get a thumbnail picture.

This class catches a preview (thumbnail) for files.

Definition at line 38 of file previewjob.h.

Member Enumeration Documentation

enum KIO::PreviewJob::ScaleType

Specifies the type of scaling that is applied to the generated preview.

Since

4.7

Enumerator
Unscaled	The original size of the preview will be returned. Most previews will return a size of 256 x 256 pixels.
Scaled	The preview will be scaled to the size specified when constructing the PreviewJob. The aspect ratio will be kept.
ScaledAndCached	The preview will be scaled to the size specified when constructing the PreviewJob. The result will be cached for later use. Per default ScaledAndCached is set.

Definition at line 46 of file previewjob.h.

Constructor & Destructor Documentation

PreviewJob::PreviewJob	(	const KFileItemList &	items,
		int	width,
		int	height,
		int	iconSize,
		int	iconAlpha,
		bool	scale,
		bool	save,
		const QStringList *	enabledPlugins
	)

Creates a new PreviewJob.

Parameters

items	a list of files to create previews for
width	the desired width
height	the desired height, 0 to use the width
iconSize	the size of the mimetype icon to overlay over the preview or zero to not overlay an icon. This has no effect if the preview plugin that will be used doesn't use icon overlays.
iconAlpha	transparency to use for the icon overlay
scale	if the image is to be scaled to the requested size or returned in its original size
save	if the image should be cached for later use
enabledPlugins	If non-zero, this points to a list containing the names of the plugins that may be used. If enabledPlugins is zero all available plugins are used.

Deprecated:

Use PreviewJob(KFileItemList, QSize, QStringList) in combination with the setter-methods instead. Note that the semantics of enabledPlugins has been slightly changed.

Definition at line 134 of file previewjob.cpp.

PreviewJob::PreviewJob	(	const KFileItemList &	items,
		const QSize &	size,
		const QStringList *	enabledPlugins = 0
	)

Parameters

items	List of files to create previews for.
size	Desired size of the preview.
enabledPlugins	If non-zero it defines the list of plugins that are considered for generating the preview. If enabledPlugins is zero the plugins specified in the KConfigGroup "PreviewSettings" are used.

Since

4.7

Definition at line 165 of file previewjob.cpp.

PreviewJob::~PreviewJob ( )

virtual

Definition at line 203 of file previewjob.cpp.

Member Function Documentation

QStringList PreviewJob::availablePlugins ( )

static

Returns a list of all available preview plugins.

The list contains the basenames of the plugins' .desktop files (no path, no .desktop).

Returns

the list of plugins

Definition at line 735 of file previewjob.cpp.

void KIO::PreviewJob::failed ( const KFileItem &  item )

signal

Emitted when a thumbnail for item could not be created, either because a ThumbCreator for its MIME type does not exist, or because something went wrong.

Parameters

item	the file that failed

void KIO::PreviewJob::gotPreview ( const KFileItem &  item, const QPixmap &  preview  )

signal

Emitted when a thumbnail picture for item has been successfully retrieved.

Parameters

item	the file of the preview
preview	the preview image

KIO::filesize_t PreviewJob::maximumFileSize ( )

static

Returns the default "maximum file size", in bytes, used by PreviewJob.

This is useful for applications providing a GUI for letting the user change the size.

Since

4.1

Deprecated:

PreviewJob uses different maximum file sizes dependent on the URL since 4.5. The returned file size is only valid for local URLs.

Definition at line 783 of file previewjob.cpp.

int PreviewJob::overlayIconAlpha

(

)

const

Returns

The alpha-value for the MIME-type icon which overlays the preview. Per default 70 is returned.

See also

PreviewJob::setOverlayIconAlpha()

Since

4.7

Definition at line 232 of file previewjob.cpp.

int PreviewJob::overlayIconSize

(

)

const

Returns

The size of the MIME-type icon which overlays the preview.

See also

PreviewJob::setOverlayIconSize()

Since

4.7

Definition at line 220 of file previewjob.cpp.

void PreviewJob::removeItem

(

const KUrl &

url

)

Removes an item from preview processing.

Use this if you passed an item to filePreview and want to delete it now.

Parameters

url	the url of the item that should be removed from the preview queue

Definition at line 381 of file previewjob.cpp.

PreviewJob::ScaleType PreviewJob::scaleType

(

)

const

Returns

The scale type for the generated preview.

See also

PreviewJob::ScaleType

Since

4.7

Definition at line 259 of file previewjob.cpp.

int KIO::PreviewJob::sequenceIndex

(

)

const

Returns the currently set sequence index.

Since

KDE 4.3

Definition at line 404 of file previewjob.cpp.

void PreviewJob::setIgnoreMaximumSize

(

bool

ignoreSize = true

)

If ignoreSize is true, then the preview is always generated regardless of the settings.

Definition at line 408 of file previewjob.cpp.

void PreviewJob::setOverlayIconAlpha

(

int

alpha

)

Sets the alpha-value for the MIME-type icon which overlays the preview.

The alpha-value may range from 0 (= fully transparent) to 255 (= opaque). Per default the value is set to 70.

See also

PreviewJob::setOverlayIconSize()

Since

4.7

Definition at line 226 of file previewjob.cpp.

void PreviewJob::setOverlayIconSize

(

int

size

)

Sets the size of the MIME-type icon which overlays the preview.

If zero is passed no overlay will be shown at all. The setting has no effect if the preview plugin that will be used does not use icon overlays. Per default the size is set to 0.

Since

4.7

Definition at line 214 of file previewjob.cpp.

void PreviewJob::setScaleType

(

ScaleType

type

)

Sets the scale type for the generated preview.

Per default PreviewJob::ScaledAndCached is set.

See also

PreviewJob::ScaleType

Since

4.7

Definition at line 238 of file previewjob.cpp.

void KIO::PreviewJob::setSequenceIndex

(

int

index

)

Sets the sequence index given to the thumb creators.

Use the sequence index, it is possible to create alternative icons for the same item. For example it may allow iterating through the items of a directory, or the frames of a video.

Since

KDE 4.3

Definition at line 400 of file previewjob.cpp.

void PreviewJob::slotResult ( KJob *  job )

protectedvirtualslot

Definition at line 440 of file previewjob.cpp.

QStringList PreviewJob::supportedMimeTypes ( )

static

Returns a list of all supported MIME types.

The list can contain entries like text/ * (without the space).

Returns

the list of mime types

Definition at line 745 of file previewjob.cpp.

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

• previewjob.h
• previewjob.cpp