Gesture Filter

Data Structures
class	GeisFilter
	Selects a subset of possible gestures in a subscription. More...

Typedefs
typedef enum _GeisFilterFacility	GeisFilterFacility
	Indicates the type of filter. More...
typedef enum _GeisFilterOperation	GeisFilterOperation
	Indicates the type of filter operation. More...

Enumerations
enum	_GeisFilterFacility { GEIS_FILTER_DEVICE, GEIS_FILTER_CLASS, GEIS_FILTER_REGION, GEIS_FILTER_SPECIAL }
	Indicates the type of filter. More...
enum	_GeisFilterOperation {   GEIS_FILTER_OP_EQ, GEIS_FILTER_OP_NE, GEIS_FILTER_OP_GT, GEIS_FILTER_OP_GE,   GEIS_FILTER_OP_LT, GEIS_FILTER_OP_LE }
	Indicates the type of filter operation. More...

Functions
GeisFilter	geis_filter_new (Geis geis, GeisString name)
	Creates a new, empty filter. More...
GeisFilter	geis_filter_clone (GeisFilter original, GeisString name)
	Creates a new filter by copying an existing filter. More...
GeisStatus	geis_filter_delete (GeisFilter filter)
	Destroys a GeisFilter. More...
GeisString	geis_filter_name (GeisFilter filter)
	Gets the name given to the filter when it was created. More...
GEIS_VARARG GeisStatus	geis_filter_add_term (GeisFilter filter, GeisFilterFacility facility,...)
	Adds a term to a filter. More...

Detailed Description

Typedef Documentation

typedef enum _GeisFilterFacility GeisFilterFacility

Indicates the type of filter.

typedef enum _GeisFilterOperation GeisFilterOperation

Indicates the type of filter operation.

Enumeration Type Documentation

enum _GeisFilterFacility

Indicates the type of filter.

Enumerator
GEIS_FILTER_DEVICE	Filters on device attributes.
GEIS_FILTER_CLASS	Filters on gesture class and gesture attributes.
GEIS_FILTER_REGION	Filters on region attributes.
GEIS_FILTER_SPECIAL	Filters on special attributes.

enum _GeisFilterOperation

Indicates the type of filter operation.

Enumerator
GEIS_FILTER_OP_EQ	Compares for equality.
GEIS_FILTER_OP_NE	Compares for inequality.
GEIS_FILTER_OP_GT	Compares for greater-than.
GEIS_FILTER_OP_GE	Compares for greater-than-or-equal.
GEIS_FILTER_OP_LT	Compares for less-than.
GEIS_FILTER_OP_LE	Compares for less-tha-or-equal.

Function Documentation

GEIS_VARARG GeisStatus geis_filter_add_term	(	GeisFilter	filter,
		GeisFilterFacility	facility,
			...
	)

Adds a term to a filter.

Parameters

[in]	filter	The filter.
[in]	facility	The term facility.
[in]	...	A list of zero or more term descriptions.

A term description is generally a (attr-name, filter-op, value) triple in which the meaning of the filter-op and value depend on the type of the attr.

The term description list must be terminated by a NULL.

In the following example we add terms to filter drag gestures made with three touch points:

geis_filter_add_term(filter,
  GEIS_FILTER_CLASS,
  GEIS_CLASS_ATTRIBUTE_NAME, GEIS_FILTER_OP_EQ, GEIS_GESTURE_DRAG,
  GEIS_GESTURE_ATTRIBUTE_TOUCHES, GEIS_FILTER_OP_EQ, 3,
  NULL);

Term descriptions are usually ANDed together, so that specifying a class name and a number of touches will filter only for gestures that have both characteristics. But if you specify several class names (e.g. drag and pinch), those classes are ORed together instead. So you can receive events from a gesture that belongs to either drag, drag&pinch or only pinch classes.

Examples:

geis2.c.

GeisFilter geis_filter_clone	(	GeisFilter	original,
		GeisString	name
	)

Creates a new filter by copying an existing filter.

Parameters

[in]	original	An existing geisFilter instance.
[in]	name	A name.

The original filter remains unchanged.

Returns

a GeisFilter object or NULL on failure.

GeisStatus geis_filter_delete

(

GeisFilter

filter

)

Destroys a GeisFilter.

Parameters

[in]

filter

The filter.

GeisString geis_filter_name

(

GeisFilter

filter

)

Gets the name given to the filter when it was created.

Parameters

[in]

filter

The filter.

GeisFilter geis_filter_new	(	Geis	geis,
		GeisString	name
	)

Creates a new, empty filter.

Parameters

[in]	geis	The GEIS API instance.
[in]	name	A name.

Returns

a GeisFilter object or NULL on failure.

Examples:

geis2.c.