IlvPanZoomInteractor Class Reference

An interactor designed for translation, zooming in, and zooming out on an IlvView. More...

#include <ilviews/manager/paninter.h>

Inheritance diagram for IlvPanZoomInteractor:

Public Member Functions
	IlvPanZoomInteractor (IlvManager *manager, IlvView *view, IlvCursor *handup=0, IlvCursor *handdown=0, IlvCursor *zoomin=0, IlvCursor *zoomout=0)
	Constructor. More...
	IlvPanZoomInteractor (IlvCursor *handup=0, IlvCursor *handdown=0, IlvCursor *zoomin=0, IlvCursor *zoomout=0)
	Constructor. More...
virtual void	abort ()
	Aborts the interaction. More...
void	allocateBitmap ()
	Allocates an IlvBitmap to simulate double buffering. More...
virtual void	drawGhost ()
	Draws a ghost rectangle representing the translation. More...
IlvCursor *	getDefaultCursor () const
	Returns the default IlvCursor set on the associated view when no mouse drag is performed. More...
IlvCursor *	getDragCursor () const
	Returns the drag IlvCursor. More...
IlFloat	getMaxZoomingFactor () const
	Returns the maximum zooming factor. More...
IlFloat	getMinZoomingFactor () const
	Returns the minimum zooming factor. More...
IlvCursor *	getZoomInCursor () const
	Returns the "zoom in" IlvCursor. More...
IlFloat	getZoomingRatio () const
	Returns the zooming ratio used by the zoomView method. More...
IlvCursor *	getZoomOutCursor () const
	Returns the "zoom out" IlvCursor. More...
virtual void	handleEvent (IlvEvent &event)
	Handles events for the manager view. More...
virtual void	init ()
	Initialization, when the interactor is attached to a view. More...
IlBoolean	isDrawingBitmap () const
	Returns whether the interactor is drawing a bitmap or not before the translation.
IlBoolean	isOpaqueMove () const
	Returns whether the interactor is in Opaque Move mode. More...
virtual void	setDefaultCursor (IlvCursor *c)
	Sets the cursor for this interactor. More...
virtual void	setDragCursor (IlvCursor *c)
	Sets the drag cursor. More...
void	setDrawingBitmap (IlBoolean set)
	Sets the "drawing bitmap" mode. More...
void	setMaxZoomingFactor (IlFloat sx)
	Sets the maximum "zooming in" factors. More...
void	setMinZoomingFactor (IlFloat sx)
	Sets the minimum zooming factor. More...
void	setOpaqueMove (IlBoolean set)
	Sets the interactor in Opaque Move mode. More...
virtual void	setZoomInCursor (IlvCursor *c)
	Sets the "Zooming in" cursor. More...
void	setZoomingRatio (IlFloat sx)
	Sets the zooming ratio used by the zoomView method. More...
virtual void	setZoomOutCursor (IlvCursor *c)
	Sets the "Zooming out" cursor. More...
Public Member Functions inherited from IlvManagerViewInteractor
	IlvManagerViewInteractor (IlvManager *manager, IlvView *view)
	Constructor. More...
virtual void	ensureVisible (const IlvPoint &point)
	Ensures the visibility of a given location. More...
IlvDisplay *	getDisplay () const
	Returns the display of the manager view. More...
IlvManager *	getManager () const
	Returns the manager. More...
IlvTransformer *	getTransformer () const
	Returns the transformer used with the manager view. More...
IlvView *	getView () const
	Returns the manager view. More...
virtual void	handleExpose (IlvRegion *clip=0)
	Called when the manager view receives an expose event. More...

Protected Member Functions
virtual void	doTranslate (IlvPos dx, IlvPos dy, IlBoolean reDraw)
	Called by the handleEvent method in order to translate the view. More...
virtual void	doZoom (const IlvPoint &center, IlFloat scalex, IlBoolean reDraw)
	Called by the handleEvent method in order to zoom the view. More...
virtual void	drawBitmap ()
	Called to draw a bitmap simulating the translation. More...

Detailed Description

An interactor designed for translation, zooming in, and zooming out on an IlvView.

Library: ilvmgr

The translation is done while dragging the mouse.
The zooming action is performing by dragging the mouse with the middle or the right button pressed down. The view will zoom in if the mouse is dragged downwards, and zoom out if the mouse is dragged upwards.
In addition, in a Microsoft Windows environment, the zooming action can be performed using the mouse wheel.

Constructor & Destructor Documentation

IlvPanZoomInteractor::IlvPanZoomInteractor	(	IlvManager *	manager,
		IlvView *	view,
		IlvCursor *	handup = 0,
		IlvCursor *	handdown = 0,
		IlvCursor *	zoomin = 0,
		IlvCursor *	zoomout = 0
	)

Constructor.

Parameters

manager	The IlvManager of the interactor.
view	The IlvView where the pan is done.
handup	The IlvCursor set on the view when no event occurs. If this parameter is not specified, a default internal IlvCursor is used.
handdown	The IlvCursor set on the view when drag events occurs. If this parameter is not specified, a default internal IlvCursor is used.
zoomin	The IlvCursor set on the view when a "zooming in" transformation occurs. If this parameter is not specified, a default internal IlvCursor is used.
zoomout	The IlvCursor set on the view when a "zooming out" transformation occurs. If this parameter is not specified, a default internal IlvCursor is used.

IlvPanZoomInteractor::IlvPanZoomInteractor	(	IlvCursor *	handup = 0,
		IlvCursor *	handdown = 0,
		IlvCursor *	zoomin = 0,
		IlvCursor *	zoomout = 0
	)

Constructor.

Parameters

handup	The IlvCursor set on the view when no event occurs. If this parameter is not specified, a default internal IlvCursor is used.
handdown	the IlvCursor set on the view when drag events occurs. If this parameter is not specified, a default internal IlvCursor is used.
zoomin	the IlvCursor set on the view when a "zooming in" transformation occurs. If this parameter is not specified, a default internal IlvCursor is used.
zoomout	the IlvCursor set on the view when a "zooming out" transformation occurs. If this parameter is not specified, a default internal IlvCursor is used.

Member Function Documentation

virtual void IlvPanZoomInteractor::abort ( )

virtual

Aborts the interaction.

Called by the manager when the user changes the current interactor. It resets the interactor to a state in which it appears to have never been launched. A common implementation is to erase the ghost image. Call this member function to inhibit the interactor action in particular circumstances.

Reimplemented from IlvManagerViewInteractor.

void IlvPanZoomInteractor::allocateBitmap

(

)

Allocates an IlvBitmap to simulate double buffering.

Allocates an IlvBitmap to simulate double buffering if the view is in simple buffering mode for the case of non-opaque zoom (for example, we allocate an IlvBitmap in order to draw the manager's content inside it and then to zoom this bitmap). Note that this method is for internal use only.

virtual void IlvPanZoomInteractor::doTranslate ( IlvPos  dx, IlvPos  dy, IlBoolean  reDraw  )

protectedvirtual

Called by the handleEvent method in order to translate the view.

Parameters

dx	The x translation factor.
dy	The y translation factor.
reDraw	If IlTrue, the view must be redrawn.

virtual void IlvPanZoomInteractor::doZoom ( const IlvPoint &  center, IlFloat  scalex, IlBoolean  reDraw  )

protectedvirtual

Called by the handleEvent method in order to zoom the view.

The default zooming factor used by the handleEvent is 1.5 for the zoom in operation and 1 / 1.5 for the zoom out. Note that the performed zoom keeps the aspect ratio (for example, scaley = scalex).

Parameters

center	The point that is left unchanged by the zoom operation. The default point used by the handleEvent method is the center of the view.
scalex	The x zooming factor.
reDraw	If IlTrue, the view must be redrawn.

virtual void IlvPanZoomInteractor::drawBitmap ( )

protectedvirtual

Called to draw a bitmap simulating the translation.

In non-opaque mode, this method is called in order to draw a bitmap simulating the translation or the zooming of the manager's contents before it is actually done.

virtual void IlvPanZoomInteractor::drawGhost ( )

virtual

Draws a ghost rectangle representing the translation.

Draws a ghost rectangle representing the translation before it is done. It is used in non-opaque mode.

See Also

IlvManagerViewInteractor::drawGhost.

Reimplemented from IlvManagerViewInteractor.

IlvCursor* IlvPanZoomInteractor::getDefaultCursor

(

)

const

Returns the default IlvCursor set on the associated view when no mouse drag is performed.

See Also

setDefaultCursor.

IlvCursor* IlvPanZoomInteractor::getDragCursor

(

)

const

Returns the drag IlvCursor.

See Also

setDragCursor.

IlFloat IlvPanZoomInteractor::getMaxZoomingFactor

(

)

const

Returns the maximum zooming factor.

Returns the maximum zooming factor beyond which the interactor will not zoom in anymore (used for the non-opaque zoom mode to prevent the bitmap zooming from becoming too large).

IlFloat IlvPanZoomInteractor::getMinZoomingFactor

(

)

const

Returns the minimum zooming factor.

Returns the minimum zooming factor beyond which the interactor will not zoom out anymore (used for the non-opaque zoom mode to prevent the bitmap zooming from becoming too small).

IlvCursor* IlvPanZoomInteractor::getZoomInCursor

(

)

const

Returns the "zoom in" IlvCursor.

See Also

setZoomInCursor.

IlFloat IlvPanZoomInteractor::getZoomingRatio

(

)

const

Returns the zooming ratio used by the zoomView method.

Returns the zooming factor used by the zoomView method. The default value is 1.5. The zooming out factor is 1 / sx.

IlvCursor* IlvPanZoomInteractor::getZoomOutCursor

(

)

const

Returns the "zoom out" IlvCursor.

See Also

setZoomOutCursor.

virtual void IlvPanZoomInteractor::handleEvent ( IlvEvent &  event )

virtual

Handles events for the manager view.

Called by the manager for which the interactor was created with every event it receives in the interactor view.

Implements IlvManagerViewInteractor.

virtual void IlvPanZoomInteractor::init ( )

virtual

Initialization, when the interactor is attached to a view.

Resets the interactor to its initial state.
Called by the manager whenever the interactor is associated with a view. An association of this kind is established by the member function IlvManager::setInteractor.

Reimplemented from IlvManagerViewInteractor.

IlBoolean IlvPanZoomInteractor::isOpaqueMove

(

)

const

Returns whether the interactor is in Opaque Move mode.

The interactor has two modes to translate or zoom the attached view: The Opaque Move mode and the Ghost Move mode. In Opaque Move mode, the transformation is applied to the view for each drag event. In the Ghost Move mode, the view is transformed only when the user releases the mouse button. The default mode is the Opaque Move mode.

Returns

A Boolean specifying whether this interactor is in Opaque Move mode.

virtual void IlvPanZoomInteractor::setDefaultCursor ( IlvCursor *  c )

virtual

Sets the cursor for this interactor.

Sets the default IlvCursor on the associated view while this view is not being translated (the left mouse button is not pressed).

Parameters

c	The cursor object.

See Also

getDefaultCursor.

virtual void IlvPanZoomInteractor::setDragCursor ( IlvCursor *  c )

virtual

Sets the drag cursor.

Sets the drag IlvCursor on the associated view while the left mouse button is pressed (while dragging for instance).

Parameters

c	The cursor object.

See Also

getDragCursor.

void IlvPanZoomInteractor::setDrawingBitmap

(

IlBoolean

set

)

Sets the "drawing bitmap" mode.

Sets the "drawing bitmap" mode. If set to IlTrue, the drawBitmap method is called in order to simulate the translation of the manager contents before it is actually done (it is done after the IlvButtonUp).
If set to IlFalse, the drawGhost method is used.

Parameters

set	The Boolean value of the drawing bitmap flag.

void IlvPanZoomInteractor::setMaxZoomingFactor

(

IlFloat

sx

)

Sets the maximum "zooming in" factors.

Sets the maximum zooming in factor beyond which the interactor will not zoom in anymore (used for the non-opaque zoom mode to prevent the bitmap zooming from becoming too large).

Parameters

sx	The new maximum zooming factor.

void IlvPanZoomInteractor::setMinZoomingFactor

(

IlFloat

sx

)

Sets the minimum zooming factor.

Sets the minimum zooming factor beyond which the interactor will not zoom out anymore (used for the non-opaque zoom mode to prevent the bitmap zooming from becoming too small).

Parameters

sx	The new minimum zooming factor.

void IlvPanZoomInteractor::setOpaqueMove

(

IlBoolean

set

)

Sets the interactor in Opaque Move mode.

The interactor has two modes to translate or zoom the attached view: the Opaque Move mode and the Ghost Move mode. In Opaque Move mode, the transformation is applied to the view for each drag event. In the Ghost Move mode, the view is transformed only when the user releases the mouse button. The default mode is the Opaque Move mode.

Parameters

set	A Boolean specifying whether the Opaque Move mode is to be set.

virtual void IlvPanZoomInteractor::setZoomInCursor ( IlvCursor *  c )

virtual

Sets the "Zooming in" cursor.

Sets the zooming in IlvCursor on the associated view when zooming in transformation occurs (middle or right mouse button vertical drag from north to south).

Parameters

c	The new cursor.

See Also

getZoomInCursor.

void IlvPanZoomInteractor::setZoomingRatio

(

IlFloat

sx

)

Sets the zooming ratio used by the zoomView method.

The zooming out factor is 1 / sx.

Parameters

sx	The new zooming ratio.

virtual void IlvPanZoomInteractor::setZoomOutCursor ( IlvCursor *  c )

virtual

Sets the "Zooming out" cursor.

Sets the zooming out IlvCursor on the associated view when zooming out transformation occurs (middle or right mouse button vertical drag from south to north).

Parameters

c	The cursor object.

See Also

getZoomOutCursor.