QgsRasterBlockFeedback Class Reference

Feedback object tailored for raster block reading. More...

#include <qgsrasterinterface.h>

Inheritance diagram for QgsRasterBlockFeedback:

Public Member Functions
	QgsRasterBlockFeedback (QObject *parent=nullptr)
	Construct a new raster block feedback object.
void	appendError (const QString &error)
	Appends an error message to the stored list of errors.
QStringList	errors () const
	Returns a list of any errors encountered while retrieving the raster block.
bool	isPreviewOnly () const
	Whether the raster provider should return only data that are already available without waiting for full result.
virtual void	onNewData ()
	May be emitted by raster data provider to indicate that some partial data are available and a new preview image may be produced.
QgsRenderContext	renderContext () const
	Returns the render context of the associated block reading.
bool	renderPartialOutput () const
	Whether our painter is drawing to a temporary image used just by this layer.
void	setPreviewOnly (bool preview)
	set flag whether the block request is for preview purposes only
void	setRenderContext (const QgsRenderContext &renderContext)
	Sets the render context of the associated block reading.
void	setRenderPartialOutput (bool enable)
	Set whether our painter is drawing to a temporary image used just by this layer.
Public Member Functions inherited from QgsFeedback
	QgsFeedback (QObject *parent=nullptr)
	Construct a feedback object.
bool	isCanceled () const
	Tells whether the operation has been canceled already.
unsigned long long	processedCount () const
	Returns the current processed objects count reported by the feedback object.
double	progress () const
	Returns the current progress reported by the feedback object.
void	setProcessedCount (unsigned long long processedCount)
	Sets the current processed objects count for the feedback object.
void	setProgress (double progress)
	Sets the current progress for the feedback object.

Additional Inherited Members
Public Slots inherited from QgsFeedback
void	cancel ()
	Tells the internal routines that the current operation should be canceled. This should be run by the main thread.
Signals inherited from QgsFeedback
void	canceled ()
	Internal routines can connect to this signal if they use event loop.
void	processedCountChanged (unsigned long long processedCount)
	Emitted when the feedback object reports a change in the number of processed objects.
void	progressChanged (double progress)
	Emitted when the feedback object reports a progress change.

Detailed Description

Feedback object tailored for raster block reading.

Definition at line 41 of file qgsrasterinterface.h.

Constructor & Destructor Documentation

QgsRasterBlockFeedback()

QgsRasterBlockFeedback::QgsRasterBlockFeedback ( QObject *  parent = nullptr )

inline

Construct a new raster block feedback object.

Definition at line 47 of file qgsrasterinterface.h.

Member Function Documentation

appendError()

void QgsRasterBlockFeedback::appendError ( const QString &  error )

inline

Appends an error message to the stored list of errors.

Should be called whenever an error is encountered while retrieving a raster block.

See also

errors()

Since

QGIS 3.8.0

Definition at line 87 of file qgsrasterinterface.h.

errors()

QStringList QgsRasterBlockFeedback::errors ( ) const

inline

Returns a list of any errors encountered while retrieving the raster block.

See also

appendError()

Since

QGIS 3.8.0

Definition at line 95 of file qgsrasterinterface.h.

isPreviewOnly()

bool QgsRasterBlockFeedback::isPreviewOnly ( ) const

inline

Whether the raster provider should return only data that are already available without waiting for full result.

By default this flag is not enabled.

See also

setPreviewOnly()

Definition at line 60 of file qgsrasterinterface.h.

onNewData()

virtual void QgsRasterBlockFeedback::onNewData ( )

inlinevirtual

May be emitted by raster data provider to indicate that some partial data are available and a new preview image may be produced.

Definition at line 53 of file qgsrasterinterface.h.

renderContext()

QgsRenderContext QgsRasterBlockFeedback::renderContext

(

)

const

Returns the render context of the associated block reading.

See also

setRenderContext()

Since

QGIS 3.24.0

Definition at line 658 of file qgsrasterinterface.cpp.

renderPartialOutput()

bool QgsRasterBlockFeedback::renderPartialOutput ( ) const

inline

Whether our painter is drawing to a temporary image used just by this layer.

See also

setRenderPartialOutput()

Definition at line 72 of file qgsrasterinterface.h.

setPreviewOnly()

void QgsRasterBlockFeedback::setPreviewOnly ( bool  preview )

inline

set flag whether the block request is for preview purposes only

See also

isPreviewOnly()

Definition at line 66 of file qgsrasterinterface.h.

setRenderContext()

void QgsRasterBlockFeedback::setRenderContext

(

const QgsRenderContext &

renderContext

)

Sets the render context of the associated block reading.

See also

renderContext()

Since

QGIS 3.24.0

Definition at line 663 of file qgsrasterinterface.cpp.

setRenderPartialOutput()

void QgsRasterBlockFeedback::setRenderPartialOutput ( bool  enable )

inline

Set whether our painter is drawing to a temporary image used just by this layer.

See also

renderPartialOutput()

Definition at line 78 of file qgsrasterinterface.h.

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

• /build/qgis-3.41.0+git20241214+cea29feecf2+99sid/src/core/raster/qgsrasterinterface.h
• /build/qgis-3.41.0+git20241214+cea29feecf2+99sid/src/core/raster/qgsrasterinterface.cpp