A task for warping a vector layer in a background thread. More...

#include <qgsvectorwarper.h>

Inheritance diagram for QgsVectorWarperTask:

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Public Types
enum class	Result { Success , Canceled , Error }
	Task results. More...

Public Types inherited from QgsTask
enum	Flag { CanCancel = 1 << 1 , CancelWithoutPrompt = 1 << 2 , Hidden = 1 << 3 , Silent = 1 << 4 , AllFlags = CanCancel }
	Task flags. More...

typedef QFlags< Flag >	Flags

enum	SubTaskDependency { SubTaskIndependent = 0 , ParentDependsOnSubTask }
	Controls how subtasks relate to their parent task. More...

enum	TaskStatus { Queued , OnHold , Running , Complete , Terminated }
	Status of tasks. More...

Public Member Functions
	QgsVectorWarperTask (QgsGcpTransformerInterface::TransformMethod method, const QList< QgsGcpPoint > &points, const QgsCoordinateReferenceSystem &destinationCrs, QgsVectorLayer *layer, const QString &fileName)
	Constructor for QgsVectorWarperTask.

void	cancel () override
	Notifies the task that it should terminate.

QString	errorMessage () const
	Returns the descriptive error message, if an error occurred.

Result	result () const
	Returns the result of running the task.

Public Member Functions inherited from QgsTask
	QgsTask (const QString &description=QString(), QgsTask::Flags flags=AllFlags)
	Constructor for QgsTask.

	~QgsTask () override

void	addSubTask (QgsTask *subTask, const QgsTaskList &dependencies=QgsTaskList(), SubTaskDependency subTaskDependency=SubTaskIndependent)
	Adds a subtask to this task.

bool	canCancel () const
	Returns `true` if the task can be canceled.

QList< QgsMapLayer * >	dependentLayers () const
	Returns the list of layers on which the task depends.

QString	description () const
	Returns the task's description.

qint64	elapsedTime () const
	Returns the elapsed time since the task commenced, in milliseconds.

Flags	flags () const
	Returns the flags associated with the task.

void	hold ()
	Places the task on hold.

bool	isActive () const
	Returns `true` if the task is active, ie it is not complete and has not been canceled.

double	progress () const
	Returns the task's progress (between 0.0 and 100.0)

void	setDependentLayers (const QList< QgsMapLayer * > &dependentLayers)
	Sets a list of layers on which the task depends.

void	setDescription (const QString &description)
	Sets the task's description.

TaskStatus	status () const
	Returns the current task status.

void	unhold ()
	Releases the task from being held.

bool	waitForFinished (int timeout=30000)
	Blocks the current thread until the task finishes or a maximum of timeout milliseconds.

Protected Member Functions
bool	run () override
	Performs the task's operation.

Protected Member Functions inherited from QgsTask
virtual void	finished (bool result)
	If the task is managed by a QgsTaskManager, this will be called after the task has finished (whether through successful completion or via early termination).

bool	isCanceled () const
	Will return `true` if task should terminate ASAP.

Additional Inherited Members
Signals inherited from QgsTask
void	begun ()
	Will be emitted by task to indicate its commencement.

void	progressChanged (double progress)
	Will be emitted by task when its progress changes.

void	statusChanged (int status)
	Will be emitted by task when its status changes.

void	taskCompleted ()
	Will be emitted by task to indicate its successful completion.

void	taskTerminated ()
	Will be emitted by task if it has terminated for any reason other then completion (e.g., when a task has been canceled or encountered an internal error).

Protected Slots inherited from QgsTask
void	setProgress (double progress)
	Sets the task's current progress.

Detailed Description

A task for warping a vector layer in a background thread.

Since: QGIS 3.26

Definition at line 81 of file qgsvectorwarper.h.

Member Enumeration Documentation

◆ Result

enum class QgsVectorWarperTask::Result

strong

Task results.

Enumerator
Success	Warping completed successfully.
Canceled	Task was canceled before completion.
Error	An error occurred while warping.

Definition at line 104 of file qgsvectorwarper.h.

Constructor & Destructor Documentation

◆ QgsVectorWarperTask()

QgsVectorWarperTask::QgsVectorWarperTask	(	QgsGcpTransformerInterface::TransformMethod	method,
		const QList< QgsGcpPoint > &	points,
		const QgsCoordinateReferenceSystem &	destinationCrs,
		QgsVectorLayer *	layer,
		const QString &	fileName
	)

Constructor for QgsVectorWarperTask.

Parameters

method	transformation method
points	GCP point list
destinationCrs	destination layer CRS
layer	source layer
fileName	filename for destination layer

Definition at line 95 of file qgsvectorwarper.cpp.

Member Function Documentation

◆ cancel()

void QgsVectorWarperTask::cancel ( )

overridevirtual

Notifies the task that it should terminate.

Calling this is not guaranteed to immediately end the task, rather it sets the isCanceled() flag which task subclasses can check and terminate their operations at an appropriate time. Any subtasks owned by this task will also be canceled. Derived classes must ensure that the base class implementation is called from any overridden version.

See also: isCanceled()

Reimplemented from QgsTask.

Definition at line 114 of file qgsvectorwarper.cpp.

◆ errorMessage()

QString QgsVectorWarperTask::errorMessage ( ) const

inline

Returns the descriptive error message, if an error occurred.

Definition at line 119 of file qgsvectorwarper.h.

◆ result()

Result QgsVectorWarperTask::result ( ) const

inline

Returns the result of running the task.

Definition at line 114 of file qgsvectorwarper.h.

◆ run()

bool QgsVectorWarperTask::run ( )

overrideprotectedvirtual

Performs the task's operation.

This method will be called when the task commences (ie via calling start() ), and subclasses should implement the operation they wish to perform in the background within this method.

A task must return a boolean value to indicate whether the task was completed successfully or terminated before completion.

Implements QgsTask.

Definition at line 122 of file qgsvectorwarper.cpp.

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

/home/fischer/src/qgis-3.38/src/analysis/georeferencing/qgsvectorwarper.h
/home/fischer/src/qgis-3.38/src/analysis/georeferencing/qgsvectorwarper.cpp

Public Types

Public Member Functions

Protected Member Functions

Additional Inherited Members