Handles exports of elevation profiles in various formats in a background task. More...

#include <qgsprofileexporter.h>

Inheritance diagram for QgsProfileExporterTask:

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Public Types
enum class	ExportResult { Success , Empty , DeviceError , DxfExportFailed , LayerExportFailed , Canceled }
	Results of exporting the profile. 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
	QgsProfileExporterTask (const QList< QgsAbstractProfileSource * > &sources, const QgsProfileRequest &request, Qgis::ProfileExportType type, const QString &destination, const QgsCoordinateTransformContext &transformContext)
	Constructor for QgsProfileExporterTask, saving results to the specified destination file.

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

QStringList	createdFiles () const
	Returns a list of layer files created during the export.

QString	error () const
	Returns a descriptive error message, if available.

	Q_ENUM (ExportResult)

QgsProfileExporterTask::ExportResult	result () const
	Returns the result of the export operation.

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

QList< QgsVectorLayer * >	takeLayers ()
	Returns a list of vector layer containing the exported profile results.

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.

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.

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.

Detailed Description

Handles exports of elevation profiles in various formats in a background task.

Since: QGIS 3.32

Definition at line 93 of file qgsprofileexporter.h.

Member Enumeration Documentation

◆ ExportResult

enum class QgsProfileExporterTask::ExportResult

strong

Results of exporting the profile.

Enumerator
Success	Successful export.
Empty	Results were empty.
DeviceError	Could not open output file device.
DxfExportFailed	Generic error when outputting to DXF.
LayerExportFailed	Generic error when outputting to files.
Canceled	Export was canceled.

Definition at line 102 of file qgsprofileexporter.h.

Constructor & Destructor Documentation

◆ QgsProfileExporterTask()

QgsProfileExporterTask::QgsProfileExporterTask	(	const QList< QgsAbstractProfileSource * > &	sources,
		const QgsProfileRequest &	request,
		Qgis::ProfileExportType	type,
		const QString &	destination,
		const QgsCoordinateTransformContext &	transformContext
	)

Constructor for QgsProfileExporterTask, saving results to the specified destination file.

If destination is an empty string then the profile results will be generated only and can be retrieved by calling takeLayers().

Definition at line 133 of file qgsprofileexporter.cpp.

Member Function Documentation

◆ cancel()

void QgsProfileExporterTask::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 288 of file qgsprofileexporter.cpp.

◆ createdFiles()

QStringList QgsProfileExporterTask::createdFiles ( ) const

inline

Returns a list of layer files created during the export.

Definition at line 148 of file qgsprofileexporter.h.

◆ error()

QString QgsProfileExporterTask::error ( ) const

inline

Returns a descriptive error message, if available.

Definition at line 153 of file qgsprofileexporter.h.

◆ Q_ENUM()

QgsProfileExporterTask::Q_ENUM ( ExportResult )

◆ result()

QgsProfileExporterTask::ExportResult QgsProfileExporterTask::result ( ) const

Returns the result of the export operation.

See also: error()

Definition at line 309 of file qgsprofileexporter.cpp.

◆ run()

bool QgsProfileExporterTask::run ( )

overridevirtual

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 146 of file qgsprofileexporter.cpp.

◆ takeLayers()

QList< QgsVectorLayer * > QgsProfileExporterTask::takeLayers ( )

Returns a list of vector layer containing the exported profile results.

While this method attempts to condense all results into a single layer, multiple layers may be returned when the geometry types of exported features differs.

Ownership of the returned layers is transferred to the caller.

Definition at line 296 of file qgsprofileexporter.cpp.

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

/build/qgis-3.40.0+99sid/src/core/elevation/qgsprofileexporter.h
/build/qgis-3.40.0+99sid/src/core/elevation/qgsprofileexporter.cpp

Public Types

Public Member Functions

Additional Inherited Members