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AtkComponent

AtkComponent — The ATK interface provided by UI components which occupy a physical area on the screen. which the user can activate/interact with.

Signals

void bounds-changed Run Last

Types and Values

Object Hierarchy

    GInterface
    ╰── AtkComponent

Known Implementations

AtkComponent is implemented by AtkNoOpObject.

Description

AtkComponent should be implemented by most if not all UI elements with an actual on-screen presence, i.e. components which can be said to have a screen-coordinate bounding box. Virtually all widgets will need to have AtkComponent implementations provided for their corresponding AtkObject class. In short, only UI elements which are *not* GUI elements will omit this ATK interface.

A possible exception might be textual information with a transparent background, in which case text glyph bounding box information is provided by AtkText.

Functions

AtkFocusHandler ()

void
(*AtkFocusHandler) (AtkObject *object,
                    gboolean focus_in);

AtkFocusHandler has been deprecated since version 2.9.4 and should not be used in newly-written code.

Deprecated with atk_component_add_focus_handler() and atk_component_remove_focus_handler(). See those methods for more information.

The type of callback function used for atk_component_add_focus_handler() and atk_component_remove_focus_handler()

Parameters

object

the AtkObject that receives/lose the focus

 

focus_in

TRUE if the object receives the focus

 

atk_component_add_focus_handler ()

guint
atk_component_add_focus_handler (AtkComponent *component,
                                 AtkFocusHandler handler);

atk_component_add_focus_handler has been deprecated since version 2.9.4 and should not be used in newly-written code.

If you need to track when an object gains or lose the focus, use the “state-change” "focused" notification instead.

Add the specified handler to the set of functions to be called when this object receives focus events (in or out). If the handler is already added it is not added again

[skip]

Parameters

component

The AtkComponent to attach the handler to

 

handler

The AtkFocusHandler to be attached to component

 

Returns

a handler id which can be used in atk_component_remove_focus_handler() or zero if the handler was already added.


atk_component_contains ()

gboolean
atk_component_contains (AtkComponent *component,
                        gint x,
                        gint y,
                        AtkCoordType coord_type);

Checks whether the specified point is within the extent of the component .

Toolkit implementor note: ATK provides a default implementation for this virtual method. In general there are little reason to re-implement it.

Parameters

component

the AtkComponent

 

x

x coordinate

 

y

y coordinate

 

coord_type

specifies whether the coordinates are relative to the screen or to the components top level window

 

Returns

TRUE or FALSE indicating whether the specified point is within the extent of the component or not


atk_component_get_extents ()

void
atk_component_get_extents (AtkComponent *component,
                           gint *x,
                           gint *y,
                           gint *width,
                           gint *height,
                           AtkCoordType coord_type);

Gets the rectangle which gives the extent of the component .

Parameters

component

an AtkComponent

 

x

address of gint to put x coordinate.

[out][optional]

y

address of gint to put y coordinate.

[out][optional]

width

address of gint to put width.

[out][optional]

height

address of gint to put height.

[out][optional]

coord_type

specifies whether the coordinates are relative to the screen or to the components top level window

 

atk_component_get_layer ()

AtkLayer
atk_component_get_layer (AtkComponent *component);

Gets the layer of the component.

Parameters

component

an AtkComponent

 

Returns

an AtkLayer which is the layer of the component


atk_component_get_mdi_zorder ()

gint
atk_component_get_mdi_zorder (AtkComponent *component);

Gets the zorder of the component. The value G_MININT will be returned if the layer of the component is not ATK_LAYER_MDI or ATK_LAYER_WINDOW.

Parameters

component

an AtkComponent

 

Returns

a gint which is the zorder of the component, i.e. the depth at which the component is shown in relation to other components in the same container.


atk_component_get_position ()

void
atk_component_get_position (AtkComponent *component,
                            gint *x,
                            gint *y,
                            AtkCoordType coord_type);

atk_component_get_position is deprecated and should not be used in newly-written code.

Since 2.12. Use atk_component_get_extents() instead.

Gets the position of component in the form of a point specifying component 's top-left corner.

Parameters

component

an AtkComponent

 

x

address of gint to put x coordinate position.

[out][optional]

y

address of gint to put y coordinate position.

[out][optional]

coord_type

specifies whether the coordinates are relative to the screen or to the components top level window

 

atk_component_get_size ()

void
atk_component_get_size (AtkComponent *component,
                        gint *width,
                        gint *height);

atk_component_get_size is deprecated and should not be used in newly-written code.

Since 2.12. Use atk_component_get_extents() instead.

Gets the size of the component in terms of width and height.

Parameters

component

an AtkComponent

 

width

address of gint to put width of component .

[out][optional]

height

address of gint to put height of component .

[out][optional]

atk_component_grab_focus ()

gboolean
atk_component_grab_focus (AtkComponent *component);

Grabs focus for this component .

Parameters

component

an AtkComponent

 

Returns

TRUE if successful, FALSE otherwise.


atk_component_ref_accessible_at_point ()

AtkObject *
atk_component_ref_accessible_at_point (AtkComponent *component,
                                       gint x,
                                       gint y,
                                       AtkCoordType coord_type);

Gets a reference to the accessible child, if one exists, at the coordinate point specified by x and y .

Parameters

component

the AtkComponent

 

x

x coordinate

 

y

y coordinate

 

coord_type

specifies whether the coordinates are relative to the screen or to the components top level window

 

Returns

a reference to the accessible child, if one exists.

[nullable][transfer full]


atk_component_remove_focus_handler ()

void
atk_component_remove_focus_handler (AtkComponent *component,
                                    guint handler_id);

atk_component_remove_focus_handler has been deprecated since version 2.9.4 and should not be used in newly-written code.

If you need to track when an object gains or lose the focus, use the “state-change” "focused" notification instead.

Remove the handler specified by handler_id from the list of functions to be executed when this object receives focus events (in or out).

Parameters

component

the AtkComponent to remove the focus handler from

 

handler_id

the handler id of the focus handler to be removed from component

 

atk_component_set_extents ()

gboolean
atk_component_set_extents (AtkComponent *component,
                           gint x,
                           gint y,
                           gint width,
                           gint height,
                           AtkCoordType coord_type);

Sets the extents of component .

Parameters

component

an AtkComponent

 

x

x coordinate

 

y

y coordinate

 

width

width to set for component

 

height

height to set for component

 

coord_type

specifies whether the coordinates are relative to the screen or to the components top level window

 

Returns

TRUE or FALSE whether the extents were set or not


atk_component_set_position ()

gboolean
atk_component_set_position (AtkComponent *component,
                            gint x,
                            gint y,
                            AtkCoordType coord_type);

Sets the postition of component .

Parameters

component

an AtkComponent

 

x

x coordinate

 

y

y coordinate

 

coord_type

specifies whether the coordinates are relative to the screen or to the components top level window

 

Returns

TRUE or FALSE whether or not the position was set or not


atk_component_set_size ()

gboolean
atk_component_set_size (AtkComponent *component,
                        gint width,
                        gint height);

Set the size of the component in terms of width and height.

Parameters

component

an AtkComponent

 

width

width to set for component

 

height

height to set for component

 

Returns

TRUE or FALSE whether the size was set or not


atk_component_get_alpha ()

gdouble
atk_component_get_alpha (AtkComponent *component);

Returns the alpha value (i.e. the opacity) for this component , on a scale from 0 (fully transparent) to 1.0 (fully opaque).

Parameters

component

an AtkComponent

 

Returns

An alpha value from 0 to 1.0, inclusive.

Since: 1.12

Types and Values

AtkComponent

typedef struct _AtkComponent AtkComponent;

struct AtkComponentIface

struct AtkComponentIface {
  GTypeInterface parent;

  guint          (* add_focus_handler)  (AtkComponent          *component,
                                         AtkFocusHandler        handler);

  gboolean       (* contains)           (AtkComponent          *component,
                                         gint                   x,
                                         gint                   y,
                                         AtkCoordType           coord_type);

  AtkObject*    (* ref_accessible_at_point)  (AtkComponent     *component,
                                         gint                   x,
                                         gint                   y,
                                         AtkCoordType           coord_type);
  void          (* get_extents)         (AtkComponent          *component,
                                         gint                  *x,
                                         gint                  *y,
                                         gint                  *width,
                                         gint                  *height,
                                         AtkCoordType          coord_type);
  void                     (* get_position)     (AtkComponent   *component,
                                                 gint           *x,
                                                 gint           *y,
                                                 AtkCoordType   coord_type);
  void                     (* get_size)                 (AtkComponent   *component,
                                                         gint           *width,
                                                         gint           *height);
  gboolean                 (* grab_focus)               (AtkComponent   *component);
  void                     (* remove_focus_handler)      (AtkComponent  *component,
                                                          guint         handler_id);
  gboolean                 (* set_extents)      (AtkComponent   *component,
                                                 gint           x,
                                                 gint           y,
                                                 gint           width,
                                                 gint           height,
                                                 AtkCoordType   coord_type);
  gboolean                 (* set_position)     (AtkComponent   *component,
                                                 gint           x,
                                                 gint           y,
                                                 AtkCoordType   coord_type);
  gboolean                 (* set_size)         (AtkComponent   *component,
                                                 gint           width,
                                                 gint           height);
  	
  AtkLayer                 (* get_layer)        (AtkComponent   *component);
  gint                     (* get_mdi_zorder)   (AtkComponent   *component);

  /*
   * signal handlers
   */
  void                     (* bounds_changed)   (AtkComponent   *component,
                                                 AtkRectangle   *bounds);
  gdouble                  (* get_alpha)        (AtkComponent   *component);
};

Members

GTypeInterface parent;

   

add_focus_handler ()

This virtual function is deprecated since 2.9.4 and it should not be overriden. See atk_component_add_focus_handler() for more information.

 

contains ()

   

ref_accessible_at_point ()

   

get_extents ()

   

get_position ()

This virtual function is deprecated since 2.12 and it should not be overriden. Use get_extents instead.

 

get_size ()

This virtual function is deprecated since 2.12 and it should not be overriden. Use get_extents instead.

 

grab_focus ()

   

remove_focus_handler ()

This virtual function is deprecated since 2.9.4 and it should not be overriden. See atk_component_remove_focus_handler() for more information.

 

set_extents ()

   

set_position ()

   

set_size ()

   

get_layer ()

   

get_mdi_zorder ()

   

bounds_changed ()

   

get_alpha ()

   

struct AtkRectangle

struct AtkRectangle {
  gint x;
  gint y;
  gint width;
  gint height;
};

A data structure for holding a rectangle. Those coordinates are relative to the component top-level parent.

Members

gint x;

X coordinate of the left side of the rectangle.

 

gint y;

Y coordinate of the top side of the rectangle.

 

gint width;

width of the rectangle.

 

gint height;

height of the rectangle.

 

Signal Details

The “bounds-changed” signal

void
user_function (AtkComponent *atkcomponent,
               AtkRectangle *arg1,
               gpointer      user_data)

The 'bounds-changed" signal is emitted when the bposition or size of the component changes.

Parameters

atkcomponent

the object which received the signal.

 

arg1

The AtkRectangle giving the new position and size.

 

user_data

user data set when the signal handler was connected.

 

Flags: Run Last

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