IlvTimeScrollable Class Reference

Date and time-related abstract class. More...

#include <ilviews/graphics/timescale.h>

Inheritance diagram for IlvTimeScrollable:

Public Member Functions
virtual IlDate	getMaxVisibleTime () const =0
	Returns the maximum time that the time scrollable can show. More...
virtual IlDate	getMinVisibleTime () const =0
	Returns the minimum time that the time scrollable can show. More...
virtual IlvDuration	getVisibleDuration () const =0
	Returns the duration of the time interval displayed by the time scrollable. More...
virtual IlvTimeInterval	getVisibleInterval () const =0
	Returns the time interval displayed by the scale. More...
virtual IlDate	getVisibleTime () const =0
	Returns the beginning of the time interval displayed by the time scrollable. More...
virtual void	setMaxVisibleTime (IlDate d)=0
	Sets the maximum time that the time scrollable can show. More...
virtual void	setMinVisibleTime (IlDate d)=0
	Sets the minimum time that the time scrollable can show. More...
virtual void	setVisibleDuration (IlvDuration duration)=0
	Sets the duration of the time interval displayed by the time scrollable. More...
virtual void	setVisibleInterval (IlDate time, IlvDuration duration)=0
	Sets the time interval displayed by the scale. More...
virtual void	setVisibleTime (IlDate time)=0
	Sets the beginning of the time interval displayed by the time scrollable. More...

Detailed Description

Date and time-related abstract class.

Library: views

This interface defines the behavior of a component whose time interval can be scrolled.

Time scrolling is constrained by the "minimum visible time" setMinVisibleTime and the "maximum visible time" setMaxVisibleTime. Both values must be valid.

There are four interrelated time properties: minVisibleTime, maxVisibleTime, visibleTime, and visibleDuration. These four values define two nested ranges like this:

minVisibleTime <= visibleTime <= visibleTime+visibleDuration <= maxVisibleTime

The time-scrollable component enforces this relationship by correcting or trimming properties according to the following rules:

• The setMinVisibleTime and setMaxVisibleTime methods first validate that:

  minVisibleTime <= maxVisibleTime

  Next, the visible time and visible duration properties may be trimmed (in that order), to fit within the new min-max interval.

• The setVisibleTime and setVisibleDuration methods trim their argument to fit within the limits defined by the other three properties.

The time-scrollable component should use the method IlvTimeScrollUtil::trimInterval to perform consistent validation and trimming of the time value arguments.

Member Function Documentation

virtual IlDate IlvTimeScrollable::getMaxVisibleTime ( ) const

pure virtual

Returns the maximum time that the time scrollable can show.

Returns

The maximum visible time.

See Also

setMaxVisibleTime

Implemented in IlvTimeScale.

virtual IlDate IlvTimeScrollable::getMinVisibleTime ( ) const

pure virtual

Returns the minimum time that the time scrollable can show.

Returns

The minimum visible time.

See Also

setMinVisibleTime

Implemented in IlvTimeScale.

virtual IlvDuration IlvTimeScrollable::getVisibleDuration ( ) const

pure virtual

Returns the duration of the time interval displayed by the time scrollable.

See Also

setVisibleDuration

Implemented in IlvTimeScale.

virtual IlvTimeInterval IlvTimeScrollable::getVisibleInterval ( ) const

pure virtual

Returns the time interval displayed by the scale.

See Also

setVisibleInterval

Implemented in IlvTimeScale.

virtual IlDate IlvTimeScrollable::getVisibleTime ( ) const

pure virtual

Returns the beginning of the time interval displayed by the time scrollable.

See Also

setVisibleTime

Implemented in IlvTimeScale.

virtual void IlvTimeScrollable::setMaxVisibleTime ( IlDate  d )

pure virtual

Sets the maximum time that the time scrollable can show.

The current visible time and duration are trimmed to fit the new min-max interval by calling the IlvTimeScrollUtil::trimInterval method.

Parameters

d	The maximum visible time.

See Also

getMaxVisibleTime

getVisibleDuration

Implemented in IlvTimeScale.

virtual void IlvTimeScrollable::setMinVisibleTime ( IlDate  d )

pure virtual

Sets the minimum time that the time scrollable can show.

The current visible time and duration are trimmed to fit the new min-max interval by calling the IlvTimeScrollUtil::trimInterval method.

Parameters

d	The minimum visible time.

See Also

getMinVisibleTime

getVisibleDuration

Implemented in IlvTimeScale.

virtual void IlvTimeScrollable::setVisibleDuration ( IlvDuration  duration )

pure virtual

Sets the duration of the time interval displayed by the time scrollable.

The specified duration is compared against the min and max visible times and is trimmed if necessary by calling the IlvTimeScrollUtil::trimInterval method. If you are changing both the visible time and duration, it is preferable to use the setVisibleInterval method instead.

Parameters

duration

The new duration value.

See Also

getVisibleDuration

getMinVisibleTime

getMaxVisibleTime

Implemented in IlvTimeScale, and IlvCalendarScale.

virtual void IlvTimeScrollable::setVisibleInterval ( IlDate  time, IlvDuration  duration  )

pure virtual

Sets the time interval displayed by the scale.

The specified duration is compared against the min and max visible times and is trimmed if necessary by calling the IlvTimeScrollUtil::trimInterval method.

Parameters

time	The new time value.
duration	The new duration value.

See Also

getMinVisibleTime

getMaxVisibleTime

Implemented in IlvTimeScale, and IlvCalendarScale.

virtual void IlvTimeScrollable::setVisibleTime ( IlDate  time )

pure virtual

Sets the beginning of the time interval displayed by the time scrollable.

The specified time value is compared against the min and max visible times and is trimmed if necessary by calling the IlvTimeScrollUtil::trimInterval method. If you are changing both the visible time and duration, it is preferable to use the setVisibleInterval method instead.

Parameters

time	The new time value.

See Also

getVisibleTime

getMinVisibleTime

getMaxVisibleTime

setVisibleInterval

Implemented in IlvTimeScale.