QgsRasterBlockFeedback class

Feedback object tailored for raster block reading.

Base classes

class QgsFeedback: Base class for feedback objects to be used for cancelation of something running in a worker thread.

QgsRasterBlockFeedback(QObject* parent = nullptr): Construct a new raster block feedback object.

auto isPreviewOnly() const -> bool: Whether the raster provider should return only data that are already available without waiting for full result.
void onNewData() virtual: May be emitted by raster data provider to indicate that some partial data are available and a new preview image may be produced.
auto renderPartialOutput() const -> bool: 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 setRenderPartialOutput(bool enable): Set whether our painter is drawing to a temporary image used just by this layer.

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

By default this flag is not enabled.

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

set flag whether the block request is for preview purposes only

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