popup text balloons above instance of vtkProp when hovering occurs More...

#include <vtkBalloonWidget.h>

Inheritance diagram for vtkBalloonWidget:

Collaboration diagram for vtkBalloonWidget:

Public Member Functions
virtual void	SetEnabled (int)
void	CreateDefaultRepresentation ()

void	SetRepresentation (vtkBalloonRepresentation *r)

vtkBalloonRepresentation *	GetBalloonRepresentation ()

void	AddBalloon (vtkProp prop, vtkStdString str, vtkImageData *img)
void	AddBalloon (vtkProp prop, const char str, vtkImageData *img)
void	AddBalloon (vtkProp prop, const char str)
void	RemoveBalloon (vtkProp *prop)

const char *	GetBalloonString (vtkProp *prop)
vtkImageData *	GetBalloonImage (vtkProp *prop)

void	UpdateBalloonString (vtkProp prop, const char str)
void	UpdateBalloonImage (vtkProp prop, vtkImageData image)

virtual vtkProp *	GetCurrentProp ()

void	SetPicker (vtkAbstractPropPicker *)
virtual vtkAbstractPropPicker *	GetPicker ()
Static Public Member Functions
static vtkBalloonWidget *	New ()
Protected Member Functions
	vtkBalloonWidget ()
	~vtkBalloonWidget ()
virtual int	SubclassEndHoverAction ()
virtual int	SubclassHoverAction ()
virtual void	RegisterPickers ()
Protected Attributes
vtkPropMap *	PropMap
vtkAbstractPropPicker *	Picker
vtkProp *	CurrentProp
typedef vtkHoverWidget	Superclass
static int	IsTypeOf (const char *type)
static vtkBalloonWidget *	SafeDownCast (vtkObjectBase *o)
virtual int	IsA (const char *type)
vtkBalloonWidget *	NewInstance () const
void	PrintSelf (ostream &os, vtkIndent indent)
virtual vtkObjectBase *	NewInstanceInternal () const

Detailed Description

popup text balloons above instance of vtkProp when hovering occurs

The vtkBalloonWidget is used to popup text and/or an image when the mouse hovers over an instance of vtkProp. The widget keeps track of (vtkProp,vtkBalloon) pairs (where the internal vtkBalloon class is defined by a pair of vtkStdString and vtkImageData), and when the mouse stops moving for a user-specified period of time over the vtkProp, then the vtkBalloon is drawn nearby the vtkProp. Note that an instance of vtkBalloonRepresentation is used to draw the balloon.

To use this widget, specify an instance of vtkBalloonWidget and a representation (e.g., vtkBalloonRepresentation). Then list all instances of vtkProp, a text string, and/or an instance of vtkImageData to be associated with each vtkProp. (Note that you can specify both text and an image, or just one or the other.) You may also wish to specify the hover delay (i.e., set in the superclass vtkHoverWidget).

Event Bindings:

By default, the widget observes the following VTK events (i.e., it watches the vtkRenderWindowInteractor for these events):

   MouseMoveEvent - occurs when mouse is moved in render window.
   TimerEvent - occurs when the time between events (e.g., mouse move)
                is greater than TimerDuration.
   KeyPressEvent - when the "Enter" key is pressed after the balloon appears,
                   a callback is activated (e.g., WidgetActivateEvent).

Event Bindings:

Note that the event bindings described above can be changed using this class's vtkWidgetEventTranslator. This class translates VTK events into the vtkBalloonWidget's widget events:

   vtkWidgetEvent::Move -- start the timer
   vtkWidgetEvent::TimedOut -- when hovering occurs,
   vtkWidgetEvent::SelectAction -- activate any callbacks associated
                                   with the balloon.

Event Bindings:

This widget invokes the following VTK events on itself (which observers can listen for):

   vtkCommand::TimerEvent (when hovering is determined to occur)
   vtkCommand::EndInteractionEvent (after a hover has occurred and the
                                    mouse begins moving again).
   vtkCommand::WidgetActivateEvent (when the balloon is selected with a
                                    keypress).

See also:: vtkAbstractWidget

Examples:: vtkBalloonWidget (Examples)

Tests:: vtkBalloonWidget (Tests)

Definition at line 90 of file vtkBalloonWidget.h.

Member Typedef Documentation

typedef vtkHoverWidget vtkBalloonWidget::Superclass

Standard methods for a VTK class.

Reimplemented from vtkHoverWidget.

Definition at line 98 of file vtkBalloonWidget.h.

Constructor & Destructor Documentation

vtkBalloonWidget::vtkBalloonWidget ( ) [protected]

vtkBalloonWidget::~vtkBalloonWidget ( ) [protected]

Member Function Documentation

static vtkBalloonWidget* vtkBalloonWidget::New ( ) [static]

Instantiate this class.

Reimplemented from vtkHoverWidget.

static int vtkBalloonWidget::IsTypeOf ( const char * type ) [static]

Standard methods for a VTK class.

Reimplemented from vtkHoverWidget.

virtual int vtkBalloonWidget::IsA ( const char * type ) [virtual]

Standard methods for a VTK class.

Reimplemented from vtkHoverWidget.

static vtkBalloonWidget* vtkBalloonWidget::SafeDownCast ( vtkObjectBase * o ) [static]

Standard methods for a VTK class.

Reimplemented from vtkHoverWidget.

virtual vtkObjectBase* vtkBalloonWidget::NewInstanceInternal ( ) const [protected, virtual]

Standard methods for a VTK class.

Reimplemented from vtkHoverWidget.

vtkBalloonWidget* vtkBalloonWidget::NewInstance ( ) const

Standard methods for a VTK class.

Reimplemented from vtkHoverWidget.

void vtkBalloonWidget::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)		`[virtual]`

Standard methods for a VTK class.

Reimplemented from vtkHoverWidget.

virtual void vtkBalloonWidget::SetEnabled ( int ) [virtual]

The method for activating and deactivating this widget. This method must be overridden because it performs special timer-related operations.

Reimplemented from vtkHoverWidget.

void vtkBalloonWidget::SetRepresentation ( vtkBalloonRepresentation * r ) [inline]

Specify an instance of vtkWidgetRepresentation used to represent this widget in the scene. Note that the representation is a subclass of vtkProp so it can be added to the renderer independent of the widget.

Definition at line 111 of file vtkBalloonWidget.h.

vtkBalloonRepresentation* vtkBalloonWidget::GetBalloonRepresentation ( ) [inline]

Return the representation as a vtkBalloonRepresentation.

Definition at line 117 of file vtkBalloonWidget.h.

void vtkBalloonWidget::CreateDefaultRepresentation ( ) [virtual]

Create the default widget representation if one is not set.

Reimplemented from vtkHoverWidget.

void vtkBalloonWidget::AddBalloon	(	vtkProp *	prop,
		vtkStdString *	str,
		vtkImageData *	img
	)

Add and remove text and/or an image to be associated with a vtkProp. You may add one or both of them.

void vtkBalloonWidget::AddBalloon	(	vtkProp *	prop,
		const char *	str,
		vtkImageData *	img
	)

Add and remove text and/or an image to be associated with a vtkProp. You may add one or both of them.

void vtkBalloonWidget::AddBalloon	(	vtkProp *	prop,
		const char *	str
	)		`[inline]`

Add and remove text and/or an image to be associated with a vtkProp. You may add one or both of them.

Definition at line 129 of file vtkBalloonWidget.h.

void vtkBalloonWidget::RemoveBalloon ( vtkProp * prop )

Add and remove text and/or an image to be associated with a vtkProp. You may add one or both of them.

const char* vtkBalloonWidget::GetBalloonString ( vtkProp * prop )

Methods to retrieve the information associated with each vtkProp (i.e., the information that makes up each balloon). A NULL will be returned if the vtkProp does not exist, or if a string or image have not been associated with the specified vtkProp.

vtkImageData* vtkBalloonWidget::GetBalloonImage ( vtkProp * prop )

Methods to retrieve the information associated with each vtkProp (i.e., the information that makes up each balloon). A NULL will be returned if the vtkProp does not exist, or if a string or image have not been associated with the specified vtkProp.

void vtkBalloonWidget::UpdateBalloonString	(	vtkProp *	prop,
		const char *	str
	)

Update the balloon string or image. If the specified prop does not exist, then nothing is added not changed.

void vtkBalloonWidget::UpdateBalloonImage	(	vtkProp *	prop,
		vtkImageData *	image
	)

Update the balloon string or image. If the specified prop does not exist, then nothing is added not changed.

virtual vtkProp* vtkBalloonWidget::GetCurrentProp ( ) [inline, virtual]

Return the current vtkProp that is being hovered over. Note that the value may be NULL (if hovering over nothing or the mouse is moving).

Definition at line 153 of file vtkBalloonWidget.h.

void vtkBalloonWidget::SetPicker ( vtkAbstractPropPicker * )

Set/Get the object used to perform pick operations. Since the vtkBalloonWidget operates on vtkProps, the picker must be a subclass of vtkAbstractPropPicker. (Note: if not specified, an instance of vtkPropPicker is used.)

virtual vtkAbstractPropPicker* vtkBalloonWidget::GetPicker ( ) [virtual]

Set/Get the object used to perform pick operations. Since the vtkBalloonWidget operates on vtkProps, the picker must be a subclass of vtkAbstractPropPicker. (Note: if not specified, an instance of vtkPropPicker is used.)

virtual int vtkBalloonWidget::SubclassEndHoverAction ( ) [protected, virtual]

Reimplemented from vtkHoverWidget.

virtual int vtkBalloonWidget::SubclassHoverAction ( ) [protected, virtual]

Reimplemented from vtkHoverWidget.

virtual void vtkBalloonWidget::RegisterPickers ( ) [protected, virtual]

Register internal Pickers in the Picking Manager. Must be reimplemented by concrete widgets to register their pickers.

Reimplemented from vtkInteractorObserver.