Interupt monitor for long computations. More...

#include <MComputation.h>

Public Member Functions
	MComputation ()
	Constructor for MComputation. More...

virtual	~MComputation ()
	Class destructor.

void	beginComputation (bool showProgressBar=false, bool isInterruptable=true, bool useWaitCursor=true)
	Mark the beginning of a long computation. More...

bool	isInterruptRequested ()
	Query whether a user-interrupt has occurred. More...

void	endComputation ()
	Mark the ending of a long computation. More...

MStatus	setProgressRange (const int minValue, const int maxValue)
	Sets the range (minValue, maxValue) of the progress indicator. More...

int	progressMin (MStatus *ReturnStatus=NULL) const
	Get the minimum progress value. More...

int	progressMax (MStatus *ReturnStatus=NULL) const
	Get the maximum progress value. More...

MStatus	setProgress (const int amount)
	Sets the progress value. More...

int	progress (MStatus *ReturnStatus=NULL) const
	Get the progress value. More...

MStatus	setProgressStatus (const MString &)
	Sets the progress status string. More...

Static Public Member Functions
static const char *	className ()
	Returns the name of this class. More...

Detailed Description

Interupt monitor for long computations.

An MComputation allows long computations to check for user interrupts. It is very simple to use. Create a new MComputation object and call the beginComputation method at the beginning of the computation and call the endComputation method when you finish. Then, during the computation, use the isInterruptRequested method to check if the user has requested that the computation terminate.

Example: (of a simple traversal)

MComputation computation;
computation.beginComputation();
for (int i= 1; i<1000; i++) {
    Computation();  // Some expensive operation
    if  (computation.isInterruptRequested()) break ;
}
computation.endComputation();

An alternate form of computation with a progress indicator is supported. In this case, the beginProgressiveComputation method is called along with the progress methods.

Example: (of a simple progressive traversal)

MComputation computation;
computation.beginComputation( true );
computation.setProgressRange( 0, 100 );
for (int i= 1; i<1000; i++) {
    Computation();  // Some expensive operation
    if  (computation.isInterruptRequested()) break ;
    computation.setProgress( (int)(i/1000.0 * 100.0) );
}
computation.endComputation();

Examples:: AbcBullet/AbcBullet.cpp, AbcExport/AbcExport.cpp, and animInfoCmd/animInfoCmd.cpp.

Constructor & Destructor Documentation

OPENMAYA_MAJOR_NAMESPACE_OPEN MComputation ( )

Constructor for MComputation.

Instantiate an MComputation before entering a long computation that should be interruptible.

Member Function Documentation

void beginComputation	(	bool	showProgressBar = `false`,
		bool	isInterruptable = `true`,
		bool	useWaitCursor = `true`
	)

Mark the beginning of a long computation.

The application will begin looking for user interupts.

Parameters

[in]	showProgressBar	if true a progress bar is displayed
[in]	isInterruptable	ESC can be used in conjunction with the isInterruptRequested() method to stop the computation. In this case setProgressStatus() should not be called.
[in]	useWaitCursor	if true, cursor goes busy during computation

Examples:: AbcBullet/AbcBullet.cpp, AbcExport/AbcExport.cpp, and animInfoCmd/animInfoCmd.cpp.

bool isInterruptRequested ( )

Query whether a user-interrupt has occurred.

Returns: true if an interrupt has occurred

Examples:: AbcBullet/AbcBullet.cpp, AbcExport/AbcExport.cpp, and animInfoCmd/animInfoCmd.cpp.

void endComputation ( )

Mark the ending of a long computation.

The application will stop looking for user interupts.

Examples:: AbcBullet/AbcBullet.cpp, AbcExport/AbcExport.cpp, and animInfoCmd/animInfoCmd.cpp.

MStatus setProgressRange	(	const int	minValue,
		const int	maxValue
	)

Sets the range (minValue, maxValue) of the progress indicator.

When the progress value is set to a value of minValue, the progress bar is displayed as empty. When the progress value is set to a value of maxValue, the progress bar is displayed as full. Intermediate progress values are displayed as intermediate positions of the progress bar.

Parameters

[in]	minValue	Minimum progress value
[in]	maxValue	Maximum progress value

Returns: Status code

Status Codes:

MS::kSuccess The range was set successfully.
MS::kInvalidParameter max is less than or equal to min.
MS::kFailure Progress has not been started or computation was not started with a progress bar.

Examples:: animInfoCmd/animInfoCmd.cpp.

int progressMin ( MStatus * ReturnStatus = NULL ) const

Get the minimum progress value.

Parameters

[out] ReturnStatus Status code

Returns: Minimum progress value. Returns -1 if query fails.

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred or the computation was not started with a progress bar.

int progressMax ( MStatus * ReturnStatus = NULL ) const

Get the maximum progress value.

Parameters

[out] ReturnStatus Status code

Returns: Maximum progress value. Returns -1 if query fails.

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred or the computation was not started with a progress bar.

MStatus setProgress ( const int amount )

Sets the progress value.

Advancing the progress value updates the progress bar to show the new amount of progress.

Parameters

[in] amount New progress value

Returns: Status code

Status Codes:

MS::kSuccess Progress value set.
MS::kFailure Progress has not been started or computation was not started with progress bar.

Examples:: animInfoCmd/animInfoCmd.cpp.

int progress ( MStatus * ReturnStatus = NULL ) const

Get the progress value.

Parameters

[out] ReturnStatus Status code

Returns: Progress value. Returns -1 if query fails.

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred or the computation was not started with a progress bar.

MStatus setProgressStatus ( const MString & progressString )

Sets the progress status string.

For example, you could use this to display the percentage of the computation which has been completed.

Parameters

[in] progressString New status string

Returns: Status code

Status Codes:

MS::kSuccess Progress status set.
MS::kFailure Progress has not been started or the computation was not started with a progress bar.

const char * className ( )

static

Returns the name of this class.

Returns: Name of this class.

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

MComputation.h
MComputation.cpp

Public Member Functions

Static Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation