Inheritance diagram for Goocanvas::Item:

Public Member Functions
	Item (Item&& src) noexcept
Item&	operator= (Item&& src) noexcept
virtual	~Item () noexcept
GooCanvasItem*	gobj ()
	Provides access to the underlying C GObject. More...
const GooCanvasItem*	gobj () const
	Provides access to the underlying C GObject. More...
Canvas*	get_canvas ()
	Returns: the Goo::Canvas. More...
const Canvas*	get_canvas () const
	Returns: the Goo::Canvas. More...
void	set_canvas (Canvas* canvas)
	This function is only intended to be used when implementing new canvas items, specifically container items such as Goo::CanvasGroup. More...
bool	is_visible () const
	Checks if the item is visible. More...
Glib::RefPtr< ItemModel >	get_model ()
	Gets the model of the given canvas item. More...
Glib::RefPtr< const ItemModel >	get_model () const
	Gets the model of the given canvas item. More...
void	set_model (const Glib::RefPtr< ItemModel >& model)
	Sets the model of the given canvas item. More...
Glib::RefPtr< Item >	get_parent ()
	Gets the parent of the given item. More...
Glib::RefPtr< const Item >	get_parent () const
	Gets the parent of the given item. More...
void	set_parent (const Glib::RefPtr< Item >& parent)
	This function is only intended to be used when implementing new canvas items (specifically container items such as Goo::CanvasGroup). More...
void	remove ()
	Removes an item from its parent. More...
bool	is_container () const
	Tests to see if the given item is a container. More...
int	get_n_children () const
	Gets the number of children of the container. More...
Glib::RefPtr< Item >	get_child (int child_num)
	Gets the child item at the given stack position. More...
Glib::RefPtr< const Item >	get_child (int child_num) const
	Gets the child item at the given stack position. More...
int	find_child (const Glib::RefPtr< Item >& child)
	Attempts to find the given child item with the container's stack. More...
void	add_child (const Glib::RefPtr< Item >& child, int pos)
	Adds a child item to a container item at the given stack position. More...
void	add_child (const Glib::RefPtr< Item >& child)
void	get_child_property_value (const Glib::RefPtr< Item >& child, const Glib::ustring& property_name, Glib::ValueBase& value) const
	Gets a child property of child. More...
void	set_child_property_value (const Glib::RefPtr< Item >& child, const Glib::ustring& property_name, const Glib::ValueBase& value)
	Sets a child property of child. More...
template<class PropertyType >
void	get_child_property (const Glib::RefPtr< Item >& child, const Glib::ustring& the_property_name, PropertyType& value) const
template<class PropertyType >
void	set_child_property (const Glib::RefPtr< Item >& child, const Glib::ustring& the_property_name, const PropertyType& value)
void	move_child (int old_position, int new_position)
	Moves a child item to a new stack position within the container. More...
void	remove_child (int child_num)
	Removes the child item at the given position. More...
void	raise (const Glib::RefPtr< Item >& above)
	Raises an item in the stacking order. More...
void	raise ()
	Raise the item to the top of the stack. More...
void	lower (const Glib::RefPtr< Item >& below)
	Lowers an item in the stacking order. More...
void	lower ()
	Lower the item to the bottom of the stack. More...
Bounds	get_bounds () const
void	request_update ()
	This function is only intended to be used when implementing new canvas items. More...
void	ensure_updated ()
	This function is only intended to be used when implementing new canvas items. More...
void	update (bool entire_tree, const Cairo::RefPtr< Cairo::Context >& context, Bounds& bounds)
	This function is only intended to be used when implementing new canvas items, specifically container items such as Goo::CanvasGroup. More...
void	paint (const Cairo::RefPtr< Cairo::Context >& context, const Bounds& bounds, double scale)
	This function is only intended to be used when implementing new canvas items, specifically container items such as Goo::CanvasGroup. More...
bool	get_requested_area (const Cairo::RefPtr< Cairo::Context >& context, Bounds& bounds) const
	This function is only intended to be used when implementing new canvas items, specifically layout items such as Goo::CanvasTable. More...
double	get_requested_height (const Cairo::RefPtr< Cairo::Context >& context, double width) const
	This function is only intended to be used when implementing new canvas items, specifically layout items such as Goo::CanvasTable. More...
void	allocate_area (const Cairo::RefPtr< Cairo::Context >& context, const Bounds& requested_area, const Bounds& allocated_area, double x_offset, double y_offset)
	This function is only intended to be used when implementing new canvas items, specifically layout items such as Goo::CanvasTable. More...
std::vector< Glib::RefPtr< Item > >	get_items_at (double x, double y, const Cairo::RefPtr< Cairo::Context >& context, bool is_pointer_event, bool parent_is_visible, const std::vector< Glib::RefPtr< Item > >& found_items)
	This function is only intended to be used when implementing new canvas items, specifically container items such as Goo::CanvasGroup. More...
std::vector< Glib::RefPtr< const Item > >	get_items_at (double x, double y, const Cairo::RefPtr< Cairo::Context >& context, bool is_pointer_event, bool parent_is_visible, const std::vector< Glib::RefPtr< const Item > >& found_items) const
	This function is only intended to be used when implementing new canvas items, specifically container items such as Goo::CanvasGroup. More...
std::vector< Glib::RefPtr< Item > >	get_items_at (double x, double y, const Cairo::RefPtr< Cairo::Context >& context, bool is_pointer_event, bool parent_is_visible)
std::vector< Glib::RefPtr< const Item > >	get_items_at (double x, double y, const Cairo::RefPtr< Cairo::Context >& context, bool is_pointer_event, bool parent_is_visible) const
bool	get_transform (Cairo::Matrix* matrix)
	Gets the transformation matrix of an item. More...
void	set_transform (const Cairo::Matrix* matrix)
	Sets the transformation matrix of an item. More...
void	set_simple_transform (double x, double y, double scale, double rotation)
	A convenience function to set the item's transformation matrix. More...
bool	get_simple_transform (double& x, double& y, double&scale, double& rotation) const
	This function can be used to get the position, scale and rotation of an item, providing that the item has a simple transformation matrix (e.g. set with set_simple_transform(), or using a combination of simple translate, scale and rotate operations). More...
void	translate (double tx, double ty)
	Translates the origin of the item's coordinate system by the given amounts. More...
void	scale (double sx, double sy)
	Scales the item's coordinate system by the given amounts. More...
void	rotate (double degrees, double cx, double cy)
	Rotates the item's coordinate system by the given amount, about the given origin. More...
void	skew_x (double degrees, double cx, double cy)
	Skews the item's coordinate system along the x axis by the given amount, about the given origin. More...
void	skew_y (double degrees, double cx, double cy)
	Skews the item's coordinate system along the y axis by the given amount, about the given origin. More...
bool	get_transform_for_child (const Glib::RefPtr< Item >& child, Cairo::Matrix*transform)
	Gets the transformation matrix of an item combined with any special transform needed for the given child. More...
Glib::RefPtr< Style >	get_style ()
	Gets the item's style. More...
Glib::RefPtr< const Style >	get_style () const
	Gets the item's style. More...
void	set_style (const Glib::RefPtr< Style >& style)
	Sets the item's style, by copying the properties from the given style. More...
void	animate (double x, double y, double scale, double degrees, bool absolute, int duration, int step_time, GooCanvasAnimateType type)
	Animates an item from its current position to the given offsets, scale and rotation. More...
void	stop_animation ()
	Stops any current animation for the given item, leaving it at its current position. More...
bool	get_is_static () const
void	set_is_static (bool is_static=true)
Glib::SignalProxy2< bool, const Glib::RefPtr< Item >&, GdkEventCrossing* >	signal_enter_notify_event ()
Glib::SignalProxy2< bool, const Glib::RefPtr< Item >&, GdkEventCrossing* >	signal_leave_notify_event ()
Glib::SignalProxy2< bool, const Glib::RefPtr< Item >&, GdkEventMotion* >	signal_motion_notify_event ()
Glib::SignalProxy2< bool, const Glib::RefPtr< Item >&, GdkEventButton* >	signal_button_press_event ()
Glib::SignalProxy2< bool, const Glib::RefPtr< Item >&, GdkEventButton* >	signal_button_release_event ()
Glib::SignalProxy2< bool, const Glib::RefPtr< Item >&, GdkEventFocus* >	signal_focus_in_event ()
Glib::SignalProxy2< bool, const Glib::RefPtr< Item >&, GdkEventFocus* >	signal_focus_out_event ()
Glib::SignalProxy2< bool, const Glib::RefPtr< Item >&, GdkEventKey* >	signal_key_press_event ()
Glib::SignalProxy2< bool, const Glib::RefPtr< Item >&, GdkEventKey* >	signal_key_release_event ()
Glib::SignalProxy2< bool, const Glib::RefPtr< Item >&, GdkEventGrabBroken* >	signal_grab_broken_event ()
Glib::SignalProxy1< void, GParamSpec* >	signal_child_notify ()
Glib::SignalProxy1< void, bool >	signal_animation_finished ()
Glib::SignalProxy2< bool, const Glib::RefPtr< Item >&, GdkEventScroll* >	signal_scroll_event ()
Glib::PropertyProxy< Glib::RefPtr< Item > >	property_parent ()
	The parent item. More...
Glib::PropertyProxy_ReadOnly< Glib::RefPtr< Item > >	property_parent () const
	The parent item. More...
Glib::PropertyProxy< ItemVisibility >	property_visibility ()
	When the canvas item is visible. More...
Glib::PropertyProxy_ReadOnly< ItemVisibility >	property_visibility () const
	When the canvas item is visible. More...
Glib::PropertyProxy< double >	property_visibility_threshold ()
	The scale threshold at which the item becomes visible. More...
Glib::PropertyProxy_ReadOnly< double >	property_visibility_threshold () const
	The scale threshold at which the item becomes visible. More...
Glib::PropertyProxy< Cairo::Matrix* >	property_transform ()
	The transformation matrix of the item. More...
Glib::PropertyProxy_ReadOnly< Cairo::Matrix* >	property_transform () const
	The transformation matrix of the item. More...
Glib::PropertyProxy< PointerEvents >	property_pointer_events ()
	Specifies when the item receives pointer events. More...
Glib::PropertyProxy_ReadOnly< PointerEvents >	property_pointer_events () const
	Specifies when the item receives pointer events. More...
Glib::PropertyProxy< Glib::ustring >	property_title ()
	A short context-rich description of the item for use by assistive technologies. More...
Glib::PropertyProxy_ReadOnly< Glib::ustring >	property_title () const
	A short context-rich description of the item for use by assistive technologies. More...
Glib::PropertyProxy< Glib::ustring >	property_description ()
	A description of the item for use by assistive technologies. More...
Glib::PropertyProxy_ReadOnly< Glib::ustring >	property_description () const
	A description of the item for use by assistive technologies. More...
Glib::PropertyProxy< bool >	property_can_focus ()
	If the item can take the keyboard focus. More...
Glib::PropertyProxy_ReadOnly< bool >	property_can_focus () const
	If the item can take the keyboard focus. More...
Glib::PropertyProxy< double >	property_x ()
	The x coordinate of the left side of the item. More...
Glib::PropertyProxy_ReadOnly< double >	property_x () const
	The x coordinate of the left side of the item. More...
Glib::PropertyProxy< double >	property_y ()
	The y coordinate of the top of the item. More...
Glib::PropertyProxy_ReadOnly< double >	property_y () const
	The y coordinate of the top of the item. More...
Glib::PropertyProxy< double >	property_width ()
	The width of the item. More...
Glib::PropertyProxy_ReadOnly< double >	property_width () const
	The width of the item. More...
Glib::PropertyProxy< double >	property_height ()
	The height of the item. More...
Glib::PropertyProxy_ReadOnly< double >	property_height () const
	The height of the item. More...
Public Member Functions inherited from Glib::Interface
	Interface ()
	Interface (Interface &&src) noexcept
Interface &	operator= (Interface &&src) noexcept
	Interface (const Glib::Interface_Class &interface_class)
	Interface (GObject *castitem)
virtual	~Interface () noexcept
	Interface (const Interface &)=delete
Interface &	operator= (const Interface &)=delete
GObject *	gobj ()
const GObject *	gobj () const
Public Member Functions inherited from Glib::ObjectBase
	ObjectBase (const ObjectBase &)=delete
ObjectBase &	operator= (const ObjectBase &)=delete
void	set_property_value (const Glib::ustring &property_name, const Glib::ValueBase &value)
void	get_property_value (const Glib::ustring &property_name, Glib::ValueBase &value) const
void	set_property (const Glib::ustring &property_name, const PropertyType &value)
void	get_property (const Glib::ustring &property_name, PropertyType &value) const
void	connect_property_changed (const Glib::ustring &property_name, const sigc::slot< void > &slot)
sigc::connection	connect_property_changed_with_return (const Glib::ustring &property_name, const sigc::slot< void > &slot)
void	freeze_notify ()
void	thaw_notify ()
virtual void	reference () const
virtual void	unreference () const
GObject *	gobj ()
const GObject *	gobj () const
GObject *	gobj_copy () const
Public Member Functions inherited from sigc::trackable
	trackable ()
	trackable (const trackable &src)
	trackable (trackable &&src) noexcept
	~trackable ()
void	add_destroy_notify_callback (void *data, func_destroy_notify func) const
void	notify_callbacks ()
trackable &	operator= (const trackable &src)
trackable &	operator= (trackable &&src) noexcept
void	remove_destroy_notify_callback (void *data) const

Static Public Member Functions
static void	add_interface (GType gtype_implementer)
static GType	get_type ()
	Get the GType for this class, for use with the underlying GObject type system. More...

Protected Member Functions
	Item ()
	You should derive from this class to use it. More...
virtual int	get_n_children_vfunc () const
virtual Glib::RefPtr< Item >	get_child_vfunc (int child_num) const
virtual void	request_update_vfunc ()
virtual Canvas*	get_canvas_vfunc () const
virtual void	set_canvas_vfunc (Canvas* canvas)
virtual void	add_child_vfunc (const Glib::RefPtr< Item >& child, int position)
virtual void	move_child_vfunc (int old_position, int new_position)
virtual void	remove_child_vfunc (int child_num)
virtual void	get_child_property_vfunc (const Glib::RefPtr< Item >& child, guint property_id, Glib::ValueBase& value, GParamSpec* pspec) const
virtual void	set_child_property_vfunc (const Glib::RefPtr< Item >& child, guint property_id, const Glib::ValueBase& value, GParamSpec* pspec)
virtual bool	get_transform_for_child_vfunc (const Glib::RefPtr< Item >& child, Cairo::Matrix*transform) const
virtual Glib::RefPtr< Item >	get_parent_vfunc () const
virtual void	set_parent_vfunc (const Glib::RefPtr< Item >& parent)
virtual void	get_bounds_vfunc (Bounds& bounds) const
virtual std::vector< Glib::RefPtr< Item > >	get_items_at_vfunc (double x, double y, const Cairo::RefPtr< Cairo::Context >& context, bool is_pointer_event, bool is_parent_visible, const std::vector< Glib::RefPtr< Item > >& found_items)
virtual void	update_vfunc (bool entire_tree, const Cairo::RefPtr< Cairo::Context >& cr, Bounds& bounds)
virtual void	paint_vfunc (const Cairo::RefPtr< Cairo::Context >& cr, const Bounds& bounds, double scale)
virtual bool	get_requested_area_vfunc (const Cairo::RefPtr< Cairo::Context >& cr, GooCanvasBounds* requested_area) const
virtual void	allocate_area_vfunc (const Cairo::RefPtr< Cairo::Context >& cr, const Bounds& requested_area, const Bounds& allocated_area, double x_offset, double y_offset)
virtual bool	get_transform_vfunc (Cairo::Matrix*transform) const
virtual void	set_transform_vfunc (const Cairo::Matrix*transform)
virtual Glib::RefPtr< Style >	get_style_vfunc () const
virtual void	set_style_vfunc (const Glib::RefPtr< Style >& style)
virtual bool	is_visible_vfunc () const
virtual double	get_requested_height_vfunc (const Cairo::RefPtr< Cairo::Context >& cr, double width)
virtual bool	get_is_static_vfunc () const
virtual void	set_is_static_vfunc (bool is_static)
virtual Glib::RefPtr< ItemModel >	get_model_vfunc () const
virtual void	set_model_vfunc (const Glib::RefPtr< ItemModel >& model)
virtual bool	on_enter_notify_event (const Glib::RefPtr< Item >& target, GdkEventCrossing* event)
	This is a default handler for the signal signal_enter_notify_event(). More...
virtual bool	on_leave_notify_event (const Glib::RefPtr< Item >& target, GdkEventCrossing* event)
	This is a default handler for the signal signal_leave_notify_event(). More...
virtual bool	on_motion_notify_event (const Glib::RefPtr< Item >& target, GdkEventMotion* event)
	This is a default handler for the signal signal_motion_notify_event(). More...
virtual bool	on_button_press_event (const Glib::RefPtr< Item >& target, GdkEventButton* event)
	This is a default handler for the signal signal_button_press_event(). More...
virtual bool	on_button_release_event (const Glib::RefPtr< Item >& target, GdkEventButton* event)
	This is a default handler for the signal signal_button_release_event(). More...
virtual bool	on_focus_in_event (const Glib::RefPtr< Item >& target, GdkEventFocus* event)
	This is a default handler for the signal signal_focus_in_event(). More...
virtual bool	on_focus_out_event (const Glib::RefPtr< Item >& target, GdkEventFocus* event)
	This is a default handler for the signal signal_focus_out_event(). More...
virtual bool	on_key_press_event (const Glib::RefPtr< Item >& target, GdkEventKey* event)
	This is a default handler for the signal signal_key_press_event(). More...
virtual bool	on_key_release_event (const Glib::RefPtr< Item >& target, GdkEventKey* event)
	This is a default handler for the signal signal_key_release_event(). More...
virtual bool	on_grab_broken_event (const Glib::RefPtr< Item >& target, GdkEventGrabBroken* event)
	This is a default handler for the signal signal_grab_broken_event(). More...
virtual void	on_child_notify (GParamSpec* pspec)
	This is a default handler for the signal signal_child_notify(). More...
virtual void	on_animation_finished (bool stopped)
	This is a default handler for the signal signal_animation_finished(). More...
virtual bool	on_scroll_event (const Glib::RefPtr< Item >& target, GdkEventScroll* event)
	This is a default handler for the signal signal_scroll_event(). More...
Protected Member Functions inherited from Glib::ObjectBase
	ObjectBase ()
	ObjectBase (const char *custom_type_name)
	ObjectBase (const std::type_info &custom_type_info)
	ObjectBase (ObjectBase &&src) noexcept
ObjectBase &	operator= (ObjectBase &&src) noexcept
virtual	~ObjectBase () noexcept=0
void	initialize (GObject *castitem)
void	initialize_move (GObject *castitem, Glib::ObjectBase *previous_wrapper)

Related Functions
(Note that these are not member functions.)
Glib::RefPtr< Goocanvas::Item >	wrap (GooCanvasItem* object, bool take_copy=false)
	A Glib::wrap() method for this object. More...

Additional Inherited Members
Public Types inherited from sigc::trackable
typedef internal::func_destroy_notify	func_destroy_notify

Constructor & Destructor Documentation

Goocanvas::Item::Item ( )

protected

You should derive from this class to use it.

Goocanvas::Item::Item ( Item&&  src )

noexcept

virtual Goocanvas::Item::~Item ( )

virtualnoexcept

Member Function Documentation

void Goocanvas::Item::add_child	(	const Glib::RefPtr< Item >&	child,
		int	pos
	)

Adds a child item to a container item at the given stack position.

Parameters

child	The item to add.
pos	The position of the item, or -1 to place it last (at the top of the stacking order).

void Goocanvas::Item::add_child

(

const Glib::RefPtr< Item >&

child

)

virtual void Goocanvas::Item::add_child_vfunc ( const Glib::RefPtr< Item >&  child, int  position  )

protectedvirtual

static void Goocanvas::Item::add_interface ( GType  gtype_implementer )

static

void Goocanvas::Item::allocate_area	(	const Cairo::RefPtr< Cairo::Context > &	context,
		const Bounds&	requested_area,
		const Bounds&	allocated_area,
		double	x_offset,
		double	y_offset
	)

This function is only intended to be used when implementing new canvas items, specifically layout items such as Goo::CanvasTable.

It allocates an area to a child Goo::CanvasItem.

Note that the parent layout item will use a transform to move each of its children for the layout, so there is no need for the child item to reposition itself. It only needs to recalculate its device bounds.

To help recalculate the item's device bounds, the x_offset and y_offset of the child item's allocated position from its requested position are provided. Simple items can just add these to their bounds.

Parameters

context	A cairo context.
requested_area	The area that the item originally requested, in the parent's coordinate space.
allocated_area	The area that the item has been allocated, in the parent's coordinate space.
x_offset	The x offset of the allocated area from the requested area in the device coordinate space.
y_offset	The y offset of the allocated area from the requested area in the device coordinate space.

virtual void Goocanvas::Item::allocate_area_vfunc ( const Cairo::RefPtr< Cairo::Context > &  cr, const Bounds&  requested_area, const Bounds&  allocated_area, double  x_offset, double  y_offset  )

protectedvirtual

void Goocanvas::Item::animate	(	double	x,
		double	y,
		double	scale,
		double	degrees,
		bool	absolute,
		int	duration,
		int	step_time,
		GooCanvasAnimateType	type
	)

Animates an item from its current position to the given offsets, scale and rotation.

Parameters

x	The final x coordinate.
y	The final y coordinate.
scale	The final scale.
degrees	The final rotation. This can be negative to rotate anticlockwise, and can also be greater than 360 to rotate a number of times.
absolute	If the x, y, scale and degrees values are absolute, or relative to the current transform. Note that absolute animations only work if the item currently has a simple transform. If the item has a shear or some other complicated transform it may result in strange animations.
duration	The duration of the animation, in milliseconds (1/1000ths of a second).
step_time	The time between each animation step, in milliseconds.
type	Specifies what happens when the animation finishes.

void Goocanvas::Item::ensure_updated

(

)

This function is only intended to be used when implementing new canvas items.

It updates the canvas immediately, if an update is scheduled. This ensures that all item bounds are up-to-date.

int Goocanvas::Item::find_child

(

const Glib::RefPtr< Item >&

child

)

Attempts to find the given child item with the container's stack.

Parameters

child

The child item to find.

Returns

The position of the given child item, or -1 if it isn't found.

Bounds Goocanvas::Item::get_bounds

(

)

const

virtual void Goocanvas::Item::get_bounds_vfunc ( Bounds&  bounds ) const

protectedvirtual

Canvas* Goocanvas::Item::get_canvas

(

)

Returns: the Goo::Canvas.

Returns

The Goo::Canvas.

const Canvas* Goocanvas::Item::get_canvas

(

)

const

Returns: the Goo::Canvas.

Returns

The Goo::Canvas.

virtual Canvas* Goocanvas::Item::get_canvas_vfunc ( ) const

protectedvirtual

Glib::RefPtr<Item> Goocanvas::Item::get_child

(

int

child_num

)

Gets the child item at the given stack position.

Parameters

child_num

The position of a child in the container's stack.

Returns

The child item at the given stack position, or 0 if child_num is out of range.

Glib::RefPtr<const Item> Goocanvas::Item::get_child

(

int

child_num

)

const

Gets the child item at the given stack position.

Parameters

child_num

The position of a child in the container's stack.

Returns

The child item at the given stack position, or 0 if child_num is out of range.

template <class PropertyType >

void Goocanvas::Item::get_child_property	(	const Glib::RefPtr< Item >&	child,
		const Glib::ustring &	the_property_name,
		PropertyType &	value
	)		const

void Goocanvas::Item::get_child_property_value	(	const Glib::RefPtr< Item >&	child,
		const Glib::ustring &	property_name,
		Glib::ValueBase &	value
	)		const

Gets a child property of child.

Parameters

child	A child Goo::CanvasItem.
property_name	The name of the child property to get.
value	A location to return the value.

virtual void Goocanvas::Item::get_child_property_vfunc ( const Glib::RefPtr< Item >&  child, guint  property_id, Glib::ValueBase &  value, GParamSpec *  pspec  ) const

protectedvirtual

virtual Glib::RefPtr<Item> Goocanvas::Item::get_child_vfunc ( int  child_num ) const

protectedvirtual

bool Goocanvas::Item::get_is_static

(

)

const

virtual bool Goocanvas::Item::get_is_static_vfunc ( ) const

protectedvirtual

std::vector< Glib::RefPtr<Item> > Goocanvas::Item::get_items_at	(	double	x,
		double	y,
		const Cairo::RefPtr< Cairo::Context > &	context,
		bool	is_pointer_event,
		bool	parent_is_visible,
		const std::vector< Glib::RefPtr< Item > >&	found_items
	)

This function is only intended to be used when implementing new canvas items, specifically container items such as Goo::CanvasGroup.

It gets the items at the given point.

Parameters

x	The x coordinate of the point.
y	The y coordinate of the point.
context	A cairo contect.
is_pointer_event	true if the "pointer-events" properties of items should be used to determine which parts of the item are tested.
parent_is_visible	true if the parent item is visible (which implies that all ancestors are also visible).
found_items	The list of items found so far.

Returns

The found_items list, with any more found items added onto the start of the list, leaving the top item first.

std::vector< Glib::RefPtr<const Item> > Goocanvas::Item::get_items_at	(	double	x,
		double	y,
		const Cairo::RefPtr< Cairo::Context > &	context,
		bool	is_pointer_event,
		bool	parent_is_visible,
		const std::vector< Glib::RefPtr< const Item > >&	found_items
	)		const

This function is only intended to be used when implementing new canvas items, specifically container items such as Goo::CanvasGroup.

It gets the items at the given point.

Parameters

x	The x coordinate of the point.
y	The y coordinate of the point.
context	A cairo contect.
is_pointer_event	true if the "pointer-events" properties of items should be used to determine which parts of the item are tested.
parent_is_visible	true if the parent item is visible (which implies that all ancestors are also visible).
found_items	The list of items found so far.

Returns

The found_items list, with any more found items added onto the start of the list, leaving the top item first.

std::vector< Glib::RefPtr<Item> > Goocanvas::Item::get_items_at	(	double	x,
		double	y,
		const Cairo::RefPtr< Cairo::Context > &	context,
		bool	is_pointer_event,
		bool	parent_is_visible
	)

std::vector< Glib::RefPtr<const Item> > Goocanvas::Item::get_items_at	(	double	x,
		double	y,
		const Cairo::RefPtr< Cairo::Context > &	context,
		bool	is_pointer_event,
		bool	parent_is_visible
	)		const

virtual std::vector<Glib::RefPtr<Item> > Goocanvas::Item::get_items_at_vfunc ( double  x, double  y, const Cairo::RefPtr< Cairo::Context > &  context, bool  is_pointer_event, bool  is_parent_visible, const std::vector< Glib::RefPtr< Item > >&  found_items  )

protectedvirtual

Glib::RefPtr<ItemModel> Goocanvas::Item::get_model

(

)

Gets the model of the given canvas item.

Returns

The item's model, or 0 if it has no model.

Glib::RefPtr<const ItemModel> Goocanvas::Item::get_model

(

)

const

Gets the model of the given canvas item.

Returns

The item's model, or 0 if it has no model.

virtual Glib::RefPtr<ItemModel> Goocanvas::Item::get_model_vfunc ( ) const

protectedvirtual

int Goocanvas::Item::get_n_children

(

)

const

Gets the number of children of the container.

Returns

The number of children.

virtual int Goocanvas::Item::get_n_children_vfunc ( ) const

protectedvirtual

Glib::RefPtr<Item> Goocanvas::Item::get_parent

(

)

Gets the parent of the given item.

Returns

The parent item, or 0 if the item has no parent.

Glib::RefPtr<const Item> Goocanvas::Item::get_parent

(

)

const

Gets the parent of the given item.

Returns

The parent item, or 0 if the item has no parent.

virtual Glib::RefPtr<Item> Goocanvas::Item::get_parent_vfunc ( ) const

protectedvirtual

bool Goocanvas::Item::get_requested_area	(	const Cairo::RefPtr< Cairo::Context > &	context,
		Bounds&	bounds
	)		const

This function is only intended to be used when implementing new canvas items, specifically layout items such as Goo::CanvasTable.

It gets the requested area of a child item.

Parameters

context	A cairo context.
bounds	A Goo::CanvasBounds to return the requested area in, in the parent's coordinate space.

Returns

true if the item should be allocated space.

virtual bool Goocanvas::Item::get_requested_area_vfunc ( const Cairo::RefPtr< Cairo::Context > &  cr, GooCanvasBounds *  requested_area  ) const

protectedvirtual

double Goocanvas::Item::get_requested_height	(	const Cairo::RefPtr< Cairo::Context > &	context,
		double	width
	)		const

This function is only intended to be used when implementing new canvas items, specifically layout items such as Goo::CanvasTable.

It gets the requested height of a child item, assuming it is allocated the given width. This is useful for text items whose requested height may change depending on the allocated width.

Parameters

context	A cairo context.
width	The width that the item may be allocated.

Returns

The requested height of the item, given the allocated width, or %-1 if the item doesn't support this method or its height doesn't change when allocated different widths.

virtual double Goocanvas::Item::get_requested_height_vfunc ( const Cairo::RefPtr< Cairo::Context > &  cr, double  width  )

protectedvirtual

bool Goocanvas::Item::get_simple_transform	(	double &	x,
		double &	y,
		double &	scale,
		double &	rotation
	)		const

This function can be used to get the position, scale and rotation of an item, providing that the item has a simple transformation matrix (e.g. set with set_simple_transform(), or using a combination of simple translate, scale and rotate operations).

If the item has a complex transformation matrix the results will be incorrect.

Parameters

x	Returns the x coordinate of the origin of the item's coordinate space.
y	Returns the y coordinate of the origin of the item's coordinate space.
scale	Returns the scale of the item.
rotation	Returns the clockwise rotation of the item, in degrees (0-360).

Returns

true if a transform is set.

Glib::RefPtr<Style> Goocanvas::Item::get_style

(

)

Gets the item's style.

If the item doesn't have its own style it will return its parent's style.

Returns

The item's style.

Glib::RefPtr<const Style> Goocanvas::Item::get_style

(

)

const

Gets the item's style.

If the item doesn't have its own style it will return its parent's style.

Returns

The item's style.

virtual Glib::RefPtr<Style> Goocanvas::Item::get_style_vfunc ( ) const

protectedvirtual

bool Goocanvas::Item::get_transform

(

Cairo::Matrix *

matrix

)

Gets the transformation matrix of an item.

Parameters

matrix

The place to store the transform.

Returns

true if a transform is set.

bool Goocanvas::Item::get_transform_for_child	(	const Glib::RefPtr< Item >&	child,
		Cairo::Matrix *	transform
	)

Gets the transformation matrix of an item combined with any special transform needed for the given child.

These special transforms are used by layout items such as Goo::CanvasTable.

Parameters

child	A child of item.
transform	The place to store the transform.

Returns

true if a transform is set.

virtual bool Goocanvas::Item::get_transform_for_child_vfunc ( const Glib::RefPtr< Item >&  child, Cairo::Matrix *  transform  ) const

protectedvirtual

virtual bool Goocanvas::Item::get_transform_vfunc ( Cairo::Matrix *  transform ) const

protectedvirtual

static GType Goocanvas::Item::get_type ( )

static

Get the GType for this class, for use with the underlying GObject type system.

GooCanvasItem* Goocanvas::Item::gobj ( )

inline

Provides access to the underlying C GObject.

const GooCanvasItem* Goocanvas::Item::gobj ( ) const

inline

Provides access to the underlying C GObject.

bool Goocanvas::Item::is_container

(

)

const

Tests to see if the given item is a container.

Returns

true if the item is a container.

bool Goocanvas::Item::is_visible

(

)

const

Checks if the item is visible.

This entails checking the item's own visibility setting, as well as those of its ancestors.

Note that the item may be scrolled off the screen and so may not be actually visible to the user.

Returns

true if the item is visible.

virtual bool Goocanvas::Item::is_visible_vfunc ( ) const

protectedvirtual

void Goocanvas::Item::lower

(

const Glib::RefPtr< Item >&

below

)

Lowers an item in the stacking order.

Parameters

below

The item to lower item below, or 0 to lower item to the bottom of the stack.

void Goocanvas::Item::lower

(

)

Lower the item to the bottom of the stack.

void Goocanvas::Item::move_child	(	int	old_position,
		int	new_position
	)

Moves a child item to a new stack position within the container.

Parameters

old_position	The current position of the child item.
new_position	The new position of the child item.

virtual void Goocanvas::Item::move_child_vfunc ( int  old_position, int  new_position  )

protectedvirtual

virtual void Goocanvas::Item::on_animation_finished ( bool  stopped )

protectedvirtual

This is a default handler for the signal signal_animation_finished().

virtual bool Goocanvas::Item::on_button_press_event ( const Glib::RefPtr< Item >&  target, GdkEventButton *  event  )

protectedvirtual

This is a default handler for the signal signal_button_press_event().

virtual bool Goocanvas::Item::on_button_release_event ( const Glib::RefPtr< Item >&  target, GdkEventButton *  event  )

protectedvirtual

This is a default handler for the signal signal_button_release_event().

virtual void Goocanvas::Item::on_child_notify ( GParamSpec *  pspec )

protectedvirtual

This is a default handler for the signal signal_child_notify().

virtual bool Goocanvas::Item::on_enter_notify_event ( const Glib::RefPtr< Item >&  target, GdkEventCrossing *  event  )

protectedvirtual

This is a default handler for the signal signal_enter_notify_event().

virtual bool Goocanvas::Item::on_focus_in_event ( const Glib::RefPtr< Item >&  target, GdkEventFocus *  event  )

protectedvirtual

This is a default handler for the signal signal_focus_in_event().

virtual bool Goocanvas::Item::on_focus_out_event ( const Glib::RefPtr< Item >&  target, GdkEventFocus *  event  )

protectedvirtual

This is a default handler for the signal signal_focus_out_event().

virtual bool Goocanvas::Item::on_grab_broken_event ( const Glib::RefPtr< Item >&  target, GdkEventGrabBroken *  event  )

protectedvirtual

This is a default handler for the signal signal_grab_broken_event().

virtual bool Goocanvas::Item::on_key_press_event ( const Glib::RefPtr< Item >&  target, GdkEventKey *  event  )

protectedvirtual

This is a default handler for the signal signal_key_press_event().

virtual bool Goocanvas::Item::on_key_release_event ( const Glib::RefPtr< Item >&  target, GdkEventKey *  event  )

protectedvirtual

This is a default handler for the signal signal_key_release_event().

virtual bool Goocanvas::Item::on_leave_notify_event ( const Glib::RefPtr< Item >&  target, GdkEventCrossing *  event  )

protectedvirtual

This is a default handler for the signal signal_leave_notify_event().

virtual bool Goocanvas::Item::on_motion_notify_event ( const Glib::RefPtr< Item >&  target, GdkEventMotion *  event  )

protectedvirtual

This is a default handler for the signal signal_motion_notify_event().

virtual bool Goocanvas::Item::on_scroll_event ( const Glib::RefPtr< Item >&  target, GdkEventScroll *  event  )

protectedvirtual

This is a default handler for the signal signal_scroll_event().

Item& Goocanvas::Item::operator= ( Item&&  src )

noexcept

void Goocanvas::Item::paint	(	const Cairo::RefPtr< Cairo::Context > &	context,
		const Bounds&	bounds,
		double	scale
	)

This function is only intended to be used when implementing new canvas items, specifically container items such as Goo::CanvasGroup.

It paints the item and all children if they intersect the given bounds.

Note that the scale argument may be different to the current scale in the Goo::CanvasItem, e.g. when the canvas is being printed.

Parameters

context	A cairo context.
bounds	The bounds that need to be repainted.
scale	The scale to use to determine whether an item should be painted. See Goo::CanvasItem::property_visibility_threshold().

virtual void Goocanvas::Item::paint_vfunc ( const Cairo::RefPtr< Cairo::Context > &  cr, const Bounds&  bounds, double  scale  )

protectedvirtual

Glib::PropertyProxy< bool > Goocanvas::Item::property_can_focus

(

)

If the item can take the keyboard focus.

Returns

A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy_ReadOnly< bool > Goocanvas::Item::property_can_focus

(

)

const

If the item can take the keyboard focus.

Returns

A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy< Glib::ustring > Goocanvas::Item::property_description

(

)

A description of the item for use by assistive technologies.

Returns

A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy_ReadOnly< Glib::ustring > Goocanvas::Item::property_description

(

)

const

A description of the item for use by assistive technologies.

Returns

A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy< double > Goocanvas::Item::property_height

(

)

The height of the item.

Returns

A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy_ReadOnly< double > Goocanvas::Item::property_height

(

)

const

The height of the item.

Returns

A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy< Glib::RefPtr<Item> > Goocanvas::Item::property_parent

(

)

The parent item.

Returns

A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy_ReadOnly< Glib::RefPtr<Item> > Goocanvas::Item::property_parent

(

)

const

The parent item.

Returns

A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy< PointerEvents > Goocanvas::Item::property_pointer_events

(

)

Specifies when the item receives pointer events.

Returns

A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy_ReadOnly< PointerEvents > Goocanvas::Item::property_pointer_events

(

)

const

Specifies when the item receives pointer events.

Returns

A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy< Glib::ustring > Goocanvas::Item::property_title

(

)

A short context-rich description of the item for use by assistive technologies.

Returns

A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy_ReadOnly< Glib::ustring > Goocanvas::Item::property_title

(

)

const

A short context-rich description of the item for use by assistive technologies.

Returns

A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy< Cairo::Matrix* > Goocanvas::Item::property_transform

(

)

The transformation matrix of the item.

Returns

A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy_ReadOnly< Cairo::Matrix* > Goocanvas::Item::property_transform

(

)

const

The transformation matrix of the item.

Returns

A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy< ItemVisibility > Goocanvas::Item::property_visibility

(

)

When the canvas item is visible.

Returns

A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy_ReadOnly< ItemVisibility > Goocanvas::Item::property_visibility

(

)

const

When the canvas item is visible.

Returns

A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy< double > Goocanvas::Item::property_visibility_threshold

(

)

The scale threshold at which the item becomes visible.

Returns

A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy_ReadOnly< double > Goocanvas::Item::property_visibility_threshold

(

)

const

The scale threshold at which the item becomes visible.

Returns

A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy< double > Goocanvas::Item::property_width

(

)

The width of the item.

Returns

A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy_ReadOnly< double > Goocanvas::Item::property_width

(

)

const

The width of the item.

Returns

A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy< double > Goocanvas::Item::property_x

(

)

The x coordinate of the left side of the item.

Returns

A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy_ReadOnly< double > Goocanvas::Item::property_x

(

)

const

The x coordinate of the left side of the item.

Returns

A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy< double > Goocanvas::Item::property_y

(

)

The y coordinate of the top of the item.

Returns

A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.

Glib::PropertyProxy_ReadOnly< double > Goocanvas::Item::property_y

(

)

const

The y coordinate of the top of the item.

Returns

A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

void Goocanvas::Item::raise

(

const Glib::RefPtr< Item >&

above

)

Raises an item in the stacking order.

Parameters

above

The item to raise item above, or 0 to raise item to the top of the stack.

void Goocanvas::Item::raise

(

)

Raise the item to the top of the stack.

void Goocanvas::Item::remove

(

)

Removes an item from its parent.

If the item is in a canvas it will be removed.

This would normally also result in the item being freed.

void Goocanvas::Item::remove_child

(

int

child_num

)

Removes the child item at the given position.

Parameters

child_num

The position of the child item to remove.

virtual void Goocanvas::Item::remove_child_vfunc ( int  child_num )

protectedvirtual

void Goocanvas::Item::request_update

(

)

This function is only intended to be used when implementing new canvas items.

It requests that an update of the item is scheduled. It will be performed as soon as the application is idle, and before the canvas is redrawn.

virtual void Goocanvas::Item::request_update_vfunc ( )

protectedvirtual

void Goocanvas::Item::rotate	(	double	degrees,
		double	cx,
		double	cy
	)

Rotates the item's coordinate system by the given amount, about the given origin.

Parameters

degrees	The clockwise angle of rotation.
cx	The x coordinate of the origin of the rotation.
cy	The y coordinate of the origin of the rotation.

void Goocanvas::Item::scale	(	double	sx,
		double	sy
	)

Scales the item's coordinate system by the given amounts.

Parameters

sx	The amount to scale the horizontal axis.
sy	The amount to scale the vertical axis.

void Goocanvas::Item::set_canvas

(

Canvas*

canvas

)

This function is only intended to be used when implementing new canvas items, specifically container items such as Goo::CanvasGroup.

It sets the canvas of the item.

Parameters

canvas

A Goo::Canvas.

virtual void Goocanvas::Item::set_canvas_vfunc ( Canvas*  canvas )

protectedvirtual

template <class PropertyType >

void Goocanvas::Item::set_child_property	(	const Glib::RefPtr< Item >&	child,
		const Glib::ustring &	the_property_name,
		const PropertyType &	value
	)

void Goocanvas::Item::set_child_property_value	(	const Glib::RefPtr< Item >&	child,
		const Glib::ustring &	property_name,
		const Glib::ValueBase &	value
	)

Sets a child property of child.

Parameters

child	A child Goo::CanvasItem.
property_name	The name of the child property to set.
value	The value to set the property to.

virtual void Goocanvas::Item::set_child_property_vfunc ( const Glib::RefPtr< Item >&  child, guint  property_id, const Glib::ValueBase &  value, GParamSpec *  pspec  )

protectedvirtual

void Goocanvas::Item::set_is_static

(

bool

is_static = true

)

virtual void Goocanvas::Item::set_is_static_vfunc ( bool  is_static )

protectedvirtual

void Goocanvas::Item::set_model

(

const Glib::RefPtr< ItemModel >&

model

)

Sets the model of the given canvas item.

Parameters

model

A Goo::CanvasItemModel.

virtual void Goocanvas::Item::set_model_vfunc ( const Glib::RefPtr< ItemModel >&  model )

protectedvirtual

void Goocanvas::Item::set_parent

(

const Glib::RefPtr< Item >&

parent

)

This function is only intended to be used when implementing new canvas items (specifically container items such as Goo::CanvasGroup).

It sets the parent of the child item. <!–PARAMETERS–> <note><para> This function cannot be used to add an item to a group or to change the parent of an item. To do that use the Goo::CanvasItem::property_parent() property. </para></note>

Parameters

parent

The new parent item.

virtual void Goocanvas::Item::set_parent_vfunc ( const Glib::RefPtr< Item >&  parent )

protectedvirtual

void Goocanvas::Item::set_simple_transform	(	double	x,
		double	y,
		double	scale,
		double	rotation
	)

A convenience function to set the item's transformation matrix.

Parameters

x	The x coordinate of the origin of the item's coordinate space.
y	The y coordinate of the origin of the item's coordinate space.
scale	The scale of the item.
rotation	The clockwise rotation of the item, in degrees.

void Goocanvas::Item::set_style

(

const Glib::RefPtr< Style >&

style

)

Sets the item's style, by copying the properties from the given style.

Parameters

style

A style.

virtual void Goocanvas::Item::set_style_vfunc ( const Glib::RefPtr< Style >&  style )

protectedvirtual

void Goocanvas::Item::set_transform

(

const Cairo::Matrix *

matrix

)

Sets the transformation matrix of an item.

Parameters

matrix

The new transformation matrix, or 0 to reset the transformation to the identity matrix.

virtual void Goocanvas::Item::set_transform_vfunc ( const Cairo::Matrix *  transform )

protectedvirtual

Glib::SignalProxy1< void,bool > Goocanvas::Item::signal_animation_finished

(

)

Slot Prototype:

void on_my_animation_finished(bool stopped)

Glib::SignalProxy2< bool,const Glib::RefPtr<Item>&,GdkEventButton* > Goocanvas::Item::signal_button_press_event

(

)

Slot Prototype:

bool on_my_button_press_event(const Glib::RefPtr<Item>& target, GdkEventButton* event)

Glib::SignalProxy2< bool,const Glib::RefPtr<Item>&,GdkEventButton* > Goocanvas::Item::signal_button_release_event

(

)

Slot Prototype:

bool on_my_button_release_event(const Glib::RefPtr<Item>& target, GdkEventButton* event)

Glib::SignalProxy1< void,GParamSpec* > Goocanvas::Item::signal_child_notify

(

)

Slot Prototype:

void on_my_child_notify(GParamSpec* pspec)

Glib::SignalProxy2< bool,const Glib::RefPtr<Item>&,GdkEventCrossing* > Goocanvas::Item::signal_enter_notify_event

(

)

Slot Prototype:

bool on_my_enter_notify_event(const Glib::RefPtr<Item>& target, GdkEventCrossing* event)

Glib::SignalProxy2< bool,const Glib::RefPtr<Item>&,GdkEventFocus* > Goocanvas::Item::signal_focus_in_event

(

)

Slot Prototype:

bool on_my_focus_in_event(const Glib::RefPtr<Item>& target, GdkEventFocus* event)

Glib::SignalProxy2< bool,const Glib::RefPtr<Item>&,GdkEventFocus* > Goocanvas::Item::signal_focus_out_event

(

)

Slot Prototype:

bool on_my_focus_out_event(const Glib::RefPtr<Item>& target, GdkEventFocus* event)

Glib::SignalProxy2< bool,const Glib::RefPtr<Item>&,GdkEventGrabBroken* > Goocanvas::Item::signal_grab_broken_event

(

)

Slot Prototype:

bool on_my_grab_broken_event(const Glib::RefPtr<Item>& target, GdkEventGrabBroken* event)

Glib::SignalProxy2< bool,const Glib::RefPtr<Item>&,GdkEventKey* > Goocanvas::Item::signal_key_press_event

(

)

Slot Prototype:

bool on_my_key_press_event(const Glib::RefPtr<Item>& target, GdkEventKey* event)

Glib::SignalProxy2< bool,const Glib::RefPtr<Item>&,GdkEventKey* > Goocanvas::Item::signal_key_release_event

(

)

Slot Prototype:

bool on_my_key_release_event(const Glib::RefPtr<Item>& target, GdkEventKey* event)

Glib::SignalProxy2< bool,const Glib::RefPtr<Item>&,GdkEventCrossing* > Goocanvas::Item::signal_leave_notify_event

(

)

Slot Prototype:

bool on_my_leave_notify_event(const Glib::RefPtr<Item>& target, GdkEventCrossing* event)

Glib::SignalProxy2< bool,const Glib::RefPtr<Item>&,GdkEventMotion* > Goocanvas::Item::signal_motion_notify_event

(

)

Slot Prototype:

bool on_my_motion_notify_event(const Glib::RefPtr<Item>& target, GdkEventMotion* event)

Glib::SignalProxy2< bool,const Glib::RefPtr<Item>&,GdkEventScroll* > Goocanvas::Item::signal_scroll_event

(

)

Slot Prototype:

bool on_my_scroll_event(const Glib::RefPtr<Item>& target, GdkEventScroll* event)

void Goocanvas::Item::skew_x	(	double	degrees,
		double	cx,
		double	cy
	)

Skews the item's coordinate system along the x axis by the given amount, about the given origin.

Parameters

degrees	The skew angle.
cx	The x coordinate of the origin of the skew transform.
cy	The y coordinate of the origin of the skew transform.

void Goocanvas::Item::skew_y	(	double	degrees,
		double	cx,
		double	cy
	)

Skews the item's coordinate system along the y axis by the given amount, about the given origin.

Parameters

degrees	The skew angle.
cx	The x coordinate of the origin of the skew transform.
cy	The y coordinate of the origin of the skew transform.

void Goocanvas::Item::stop_animation

(

)

Stops any current animation for the given item, leaving it at its current position.

void Goocanvas::Item::translate	(	double	tx,
		double	ty
	)

Translates the origin of the item's coordinate system by the given amounts.

Parameters

tx	The amount to move the origin in the horizontal direction.
ty	The amount to move the origin in the vertical direction.

void Goocanvas::Item::update	(	bool	entire_tree,
		const Cairo::RefPtr< Cairo::Context > &	context,
		Bounds&	bounds
	)

This function is only intended to be used when implementing new canvas items, specifically container items such as Goo::CanvasGroup.

Updates the item, if needed, and any children.

Parameters

entire_tree	If the entire subtree should be updated.
context	A cairo context.
bounds	A Goo::CanvasBounds to return the new bounds in.

virtual void Goocanvas::Item::update_vfunc ( bool  entire_tree, const Cairo::RefPtr< Cairo::Context > &  cr, Bounds&  bounds  )

protectedvirtual

Friends And Related Function Documentation

Glib::RefPtr< Goocanvas::Item > wrap ( GooCanvasItem *  object, bool  take_copy = false  )

related

A Glib::wrap() method for this object.

Parameters

object	The C instance.
take_copy	False if the result should take ownership of the C instance. True if it should take a new copy or ref.

Returns

A C++ instance that wraps this C instance.

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The documentation for this class was generated from the following file:

• goocanvasmm/item.h