IlvGanttScaleInteractor Class Reference

Interactor to change the time interval of a Gantt scale. More...

#include <ilviews/gantt/ganttint.h>

Inheritance diagram for IlvGanttScaleInteractor:

Public Member Functions
	IlvGanttScaleInteractor ()
	Constructor. More...
virtual void	drawGhost (IlvContainer *view, IlvGraphic *scale, const IlvRect &timeRect, const IlvTransformer *t=0)
	Draws the interval dragged by the user. More...
IlvGanttChart *	getGanttChart (const IlvGraphic *scale) const
	Returns the Gantt chart managing a given scale. More...
virtual IlBoolean	handleEvent (IlvGraphic *scale, IlvEvent &event, const IlvTransformer *t)
	Handles incoming events. More...
virtual void	validate (IlvGraphic *scale, const IlvRect &timeRect, IlInt &shownStart, IlInt &shownEnd)
	Controls the scale time interval. More...

Detailed Description

Interactor to change the time interval of a Gantt scale.

Library: ilvgantt

Use the IlvGanttScaleInteractor class to zoom in the Gantt grapher views on the time axis. This interactor is attached by default to the Gantt scales.

The registered name of this interactor is "GanttScale".

See also

IlvGanttChart, IlvRectangularScale.

Constructor & Destructor Documentation

IlvGanttScaleInteractor()

IlvGanttScaleInteractor::IlvGanttScaleInteractor

(

)

Constructor.

The constructor initializes an instance of the IlvGanttScaleInteractor class.

Member Function Documentation

drawGhost()

virtual void IlvGanttScaleInteractor::drawGhost ( IlvContainer *  view, IlvGraphic *  scale, const IlvRect &  timeRect, const IlvTransformer *  t = 0  )

virtual

Draws the interval dragged by the user.

Draws the rectangle specifying the time interval in XOR mode.

Parameters

view	The view where the scale is displayed.
scale	The considered Gantt scale.
timeRect	The rectangle specifying the time interval.
t	The transformer applied to the view view.

getGanttChart()

IlvGanttChart* IlvGanttScaleInteractor::getGanttChart

(

const IlvGraphic *

scale

)

const

Returns the Gantt chart managing a given scale.

Parameters

scale

The Gantt scale.

Returns

The Gantt chart managing the scale scale.

handleEvent()

virtual IlBoolean IlvGanttScaleInteractor::handleEvent ( IlvGraphic *  scale, IlvEvent &  event, const IlvTransformer *  t  )

virtual

Handles incoming events.

Computes and sets the new shown start and shown end of the pointed scale object. The interval is controlled by the IlvGanttScaleInteractor::validate method. When the button is released, the IlvGanttChart::showInterval is used.

Parameters

scale	The considered Gantt scale.
event	The received event.
t	The transformer applied to the view where the event occurred.

Returns

IlTrue if the event is consumed, IlFalse otherwise.

Implements IlvInteractor.

validate()

virtual void IlvGanttScaleInteractor::validate ( IlvGraphic *  scale, const IlvRect &  timeRect, IlInt &  shownStart, IlInt &  shownEnd  )

virtual

Controls the scale time interval.

Modifies the shown start time and shown end time of the Gantt chart scale scale. The provided values are computed from the timeRect rectangle drawn by the user. The default implementation does nothing.

Parameters

scale	The considered Gantt scale.
timeRect	The rectangle specifying the time interval.
shownStart	The computed start time for the scale.
shownEnd	The computed end time for the scale.