GtkCellRenderer: GTK+ 3 Reference Manual

GtkCellRenderer

GtkCellRenderer — An object for rendering a single cell

Functions

void	gtk_cell_renderer_class_set_accessible_type ()
void	gtk_cell_renderer_get_aligned_area ()
void	gtk_cell_renderer_get_size ()
void	gtk_cell_renderer_render ()
gboolean	gtk_cell_renderer_activate ()
GtkCellEditable *	gtk_cell_renderer_start_editing ()
void	gtk_cell_renderer_stop_editing ()
void	gtk_cell_renderer_get_fixed_size ()
void	gtk_cell_renderer_set_fixed_size ()
gboolean	gtk_cell_renderer_get_visible ()
void	gtk_cell_renderer_set_visible ()
gboolean	gtk_cell_renderer_get_sensitive ()
void	gtk_cell_renderer_set_sensitive ()
void	gtk_cell_renderer_get_alignment ()
void	gtk_cell_renderer_set_alignment ()
void	gtk_cell_renderer_get_padding ()
void	gtk_cell_renderer_set_padding ()
GtkStateFlags	gtk_cell_renderer_get_state ()
gboolean	gtk_cell_renderer_is_activatable ()
void	gtk_cell_renderer_get_preferred_height ()
void	gtk_cell_renderer_get_preferred_height_for_width ()
void	gtk_cell_renderer_get_preferred_size ()
void	gtk_cell_renderer_get_preferred_width ()
void	gtk_cell_renderer_get_preferred_width_for_height ()
GtkSizeRequestMode	gtk_cell_renderer_get_request_mode ()

Properties

char *	cell-background	Write
GdkColor *	cell-background-gdk	Read / Write
GdkRGBA *	cell-background-rgba	Read / Write
gboolean	cell-background-set	Read / Write
gboolean	editing	Read
int	height	Read / Write
gboolean	is-expanded	Read / Write
gboolean	is-expander	Read / Write
GtkCellRendererMode	mode	Read / Write
gboolean	sensitive	Read / Write
gboolean	visible	Read / Write
int	width	Read / Write
float	xalign	Read / Write
guint	xpad	Read / Write
float	yalign	Read / Write
guint	ypad	Read / Write

Signals

void	editing-canceled	Run First
void	editing-started	Run First

Types and Values

enum	GtkCellRendererState
enum	GtkCellRendererMode
struct	GtkCellRenderer
struct	GtkCellRendererClass

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GtkCellRenderer
            ├── GtkCellRendererText
            ├── GtkCellRendererPixbuf
            ├── GtkCellRendererProgress
            ├── GtkCellRendererSpinner
            ╰── GtkCellRendererToggle

Includes

#include <gtk/gtk.h>

Description

The GtkCellRenderer is a base class of a set of objects used for rendering a cell to a cairo_t. These objects are used primarily by the GtkTreeView widget, though they aren’t tied to them in any specific way. It is worth noting that GtkCellRenderer is not a GtkWidget and cannot be treated as such.

The primary use of a GtkCellRenderer is for drawing a certain graphical elements on a cairo_t. Typically, one cell renderer is used to draw many cells on the screen. To this extent, it isn’t expected that a CellRenderer keep any permanent state around. Instead, any state is set just prior to use using GObjects property system. Then, the cell is measured using gtk_cell_renderer_get_size(). Finally, the cell is rendered in the correct location using gtk_cell_renderer_render().

There are a number of rules that must be followed when writing a new GtkCellRenderer. First and foremost, it’s important that a certain set of properties will always yield a cell renderer of the same size, barring a GtkStyle change. The GtkCellRenderer also has a number of generic properties that are expected to be honored by all children.

Beyond merely rendering a cell, cell renderers can optionally provide active user interface elements. A cell renderer can be “activatable” like GtkCellRendererToggle, which toggles when it gets activated by a mouse click, or it can be “editable” like GtkCellRendererText, which allows the user to edit the text using a widget implementing the GtkCellEditable interface, e.g. GtkEntry. To make a cell renderer activatable or editable, you have to implement the GtkCellRendererClass.activate or GtkCellRendererClass.start_editing virtual functions, respectively.

Many properties of GtkCellRenderer and its subclasses have a corresponding “set” property, e.g. “cell-background-set” corresponds to “cell-background”. These “set” properties reflect whether a property has been set or not. You should not set them independently.

Functions

gtk_cell_renderer_class_set_accessible_type ()

void
gtk_cell_renderer_class_set_accessible_type
                               (GtkCellRendererClass *renderer_class,
                                GType type);

Sets the type to be used for creating accessibles for cells rendered by cell renderers of renderer_class . Note that multiple accessibles will be created.

This function should only be called from class init functions of cell renderers.

Parameters

renderer_class	class to set the accessible type for
type	The object type that implements the accessible for `widget_class` . The type must be a subtype of GtkRendererCellAccessible

gtk_cell_renderer_get_aligned_area ()

void
gtk_cell_renderer_get_aligned_area (GtkCellRenderer *cell,
                                    GtkWidget *widget,
                                    GtkCellRendererState flags,
                                    const GdkRectangle *cell_area,
                                    GdkRectangle *aligned_area);

Gets the aligned area used by cell inside cell_area . Used for finding the appropriate edit and focus rectangle.

Parameters

cell	a GtkCellRenderer instance
widget	the GtkWidget this cell will be rendering to
flags	render flags
cell_area	cell area which would be passed to `gtk_cell_renderer_render()`
aligned_area	the return location for the space inside `cell_area` that would acually be used to render.	[out]

Since: 3.0

gtk_cell_renderer_get_size ()

void
gtk_cell_renderer_get_size (GtkCellRenderer *cell,
                            GtkWidget *widget,
                            const GdkRectangle *cell_area,
                            gint *x_offset,
                            gint *y_offset,
                            gint *width,
                            gint *height);

gtk_cell_renderer_get_size has been deprecated since version 3.0 and should not be used in newly-written code.

Use gtk_cell_renderer_get_preferred_size() instead.

Obtains the width and height needed to render the cell. Used by view widgets to determine the appropriate size for the cell_area passed to gtk_cell_renderer_render(). If cell_area is not NULL, fills in the x and y offsets (if set) of the cell relative to this location.

Please note that the values set in width and height , as well as those in x_offset and y_offset are inclusive of the xpad and ypad properties.

Parameters

cell	a GtkCellRenderer
widget	the widget the renderer is rendering to
cell_area	The area a cell will be allocated, or `NULL`.	[allow-none]
x_offset	location to return x offset of cell relative to `cell_area` , or `NULL`.	[out][allow-none]
y_offset	location to return y offset of cell relative to `cell_area` , or `NULL`.	[out][allow-none]
width	location to return width needed to render a cell, or `NULL`.	[out][allow-none]
height	location to return height needed to render a cell, or `NULL`.	[out][allow-none]

gtk_cell_renderer_render ()

void
gtk_cell_renderer_render (GtkCellRenderer *cell,
                          cairo_t *cr,
                          GtkWidget *widget,
                          const GdkRectangle *background_area,
                          const GdkRectangle *cell_area,
                          GtkCellRendererState flags);

Invokes the virtual render function of the GtkCellRenderer. The three passed-in rectangles are areas in cr . Most renderers will draw within cell_area ; the xalign, yalign, xpad, and ypad fields of the GtkCellRenderer should be honored with respect to cell_area . background_area includes the blank space around the cell, and also the area containing the tree expander; so the background_area rectangles for all cells tile to cover the entire window .

Parameters

cell	a GtkCellRenderer
cr	a cairo context to draw to
widget	the widget owning `window`
background_area	entire cell area (including tree expanders and maybe padding on the sides)
cell_area	area normally rendered by a cell renderer
flags	flags that affect rendering

gtk_cell_renderer_activate ()

gboolean
gtk_cell_renderer_activate (GtkCellRenderer *cell,
                            GdkEvent *event,
                            GtkWidget *widget,
                            const gchar *path,
                            const GdkRectangle *background_area,
                            const GdkRectangle *cell_area,
                            GtkCellRendererState flags);

Passes an activate event to the cell renderer for possible processing. Some cell renderers may use events; for example, GtkCellRendererToggle toggles when it gets a mouse click.

Parameters

cell	a GtkCellRenderer
event	a GdkEvent
widget	widget that received the event
path	widget-dependent string representation of the event location; e.g. for GtkTreeView, a string representation of GtkTreePath
background_area	background area as passed to `gtk_cell_renderer_render()`
cell_area	cell area as passed to `gtk_cell_renderer_render()`
flags	render flags

Returns

TRUE if the event was consumed/handled

gtk_cell_renderer_start_editing ()

GtkCellEditable *
gtk_cell_renderer_start_editing (GtkCellRenderer *cell,
                                 GdkEvent *event,
                                 GtkWidget *widget,
                                 const gchar *path,
                                 const GdkRectangle *background_area,
                                 const GdkRectangle *cell_area,
                                 GtkCellRendererState flags);

Starts editing the contents of this cell , through a new GtkCellEditable widget created by the GtkCellRendererClass.start_editing virtual function.

Parameters

cell	a GtkCellRenderer
event	a GdkEvent.	[nullable]
widget	widget that received the event
path	widget-dependent string representation of the event location; e.g. for GtkTreeView, a string representation of GtkTreePath
background_area	background area as passed to `gtk_cell_renderer_render()`
cell_area	cell area as passed to `gtk_cell_renderer_render()`
flags	render flags

Returns

A new GtkCellEditable for editing this cell , or NULL if editing is not possible.

[nullable][transfer none]

gtk_cell_renderer_stop_editing ()

void
gtk_cell_renderer_stop_editing (GtkCellRenderer *cell,
                                gboolean canceled);

Informs the cell renderer that the editing is stopped. If canceled is TRUE, the cell renderer will emit the “editing-canceled” signal.

This function should be called by cell renderer implementations in response to the “editing-done” signal of GtkCellEditable.

Parameters

cell	A GtkCellRenderer
canceled	`TRUE` if the editing has been canceled

Since: 2.6

gtk_cell_renderer_get_fixed_size ()

void
gtk_cell_renderer_get_fixed_size (GtkCellRenderer *cell,
                                  gint *width,
                                  gint *height);

Fills in width and height with the appropriate size of cell .

Parameters

cell	A GtkCellRenderer
width	location to fill in with the fixed width of the cell, or `NULL`.	[out][allow-none]
height	location to fill in with the fixed height of the cell, or `NULL`.	[out][allow-none]

gtk_cell_renderer_set_fixed_size ()

void
gtk_cell_renderer_set_fixed_size (GtkCellRenderer *cell,
                                  gint width,
                                  gint height);

Sets the renderer size to be explicit, independent of the properties set.

Parameters

cell	A GtkCellRenderer
width	the width of the cell renderer, or -1
height	the height of the cell renderer, or -1

gtk_cell_renderer_get_visible ()

gboolean
gtk_cell_renderer_get_visible (GtkCellRenderer *cell);

Returns the cell renderer’s visibility.

Parameters

cell

A GtkCellRenderer

Returns

TRUE if the cell renderer is visible

Since: 2.18

gtk_cell_renderer_set_visible ()

void
gtk_cell_renderer_set_visible (GtkCellRenderer *cell,
                               gboolean visible);

Sets the cell renderer’s visibility.

Parameters

cell	A GtkCellRenderer
visible	the visibility of the cell

Since: 2.18

gtk_cell_renderer_get_sensitive ()

gboolean
gtk_cell_renderer_get_sensitive (GtkCellRenderer *cell);

Returns the cell renderer’s sensitivity.

Parameters

cell

A GtkCellRenderer

Returns

TRUE if the cell renderer is sensitive

Since: 2.18

gtk_cell_renderer_set_sensitive ()

void
gtk_cell_renderer_set_sensitive (GtkCellRenderer *cell,
                                 gboolean sensitive);

Sets the cell renderer’s sensitivity.

Parameters

cell	A GtkCellRenderer
sensitive	the sensitivity of the cell

Since: 2.18

gtk_cell_renderer_get_alignment ()

void
gtk_cell_renderer_get_alignment (GtkCellRenderer *cell,
                                 gfloat *xalign,
                                 gfloat *yalign);

Fills in xalign and yalign with the appropriate values of cell .

Parameters

cell	A GtkCellRenderer
xalign	location to fill in with the x alignment of the cell, or `NULL`.	[out][allow-none]
yalign	location to fill in with the y alignment of the cell, or `NULL`.	[out][allow-none]

Since: 2.18

gtk_cell_renderer_set_alignment ()

void
gtk_cell_renderer_set_alignment (GtkCellRenderer *cell,
                                 gfloat xalign,
                                 gfloat yalign);

Sets the renderer’s alignment within its available space.

Parameters

cell	A GtkCellRenderer
xalign	the x alignment of the cell renderer
yalign	the y alignment of the cell renderer

Since: 2.18

gtk_cell_renderer_get_padding ()

void
gtk_cell_renderer_get_padding (GtkCellRenderer *cell,
                               gint *xpad,
                               gint *ypad);

Fills in xpad and ypad with the appropriate values of cell .

Parameters

cell	A GtkCellRenderer
xpad	location to fill in with the x padding of the cell, or `NULL`.	[out][allow-none]
ypad	location to fill in with the y padding of the cell, or `NULL`.	[out][allow-none]

Since: 2.18

gtk_cell_renderer_set_padding ()

void
gtk_cell_renderer_set_padding (GtkCellRenderer *cell,
                               gint xpad,
                               gint ypad);

Sets the renderer’s padding.

Parameters

cell	A GtkCellRenderer
xpad	the x padding of the cell renderer
ypad	the y padding of the cell renderer

Since: 2.18

gtk_cell_renderer_get_state ()

GtkStateFlags
gtk_cell_renderer_get_state (GtkCellRenderer *cell,
                             GtkWidget *widget,
                             GtkCellRendererState cell_state);

Translates the cell renderer state to GtkStateFlags, based on the cell renderer and widget sensitivity, and the given GtkCellRendererState.

Parameters

cell	a GtkCellRenderer, or `NULL`.	[nullable]
widget	a GtkWidget, or `NULL`.	[nullable]
cell_state	cell renderer state

Returns

the widget state flags applying to cell

Since: 3.0

gtk_cell_renderer_is_activatable ()

gboolean
gtk_cell_renderer_is_activatable (GtkCellRenderer *cell);

Checks whether the cell renderer can do something when activated.

Parameters

cell

A GtkCellRenderer

Returns

TRUE if the cell renderer can do anything when activated

Since: 3.0

gtk_cell_renderer_get_preferred_height ()

void
gtk_cell_renderer_get_preferred_height
                               (GtkCellRenderer *cell,
                                GtkWidget *widget,
                                gint *minimum_size,
                                gint *natural_size);

Retreives a renderer’s natural size when rendered to widget .

Parameters

cell	a GtkCellRenderer instance
widget	the GtkWidget this cell will be rendering to
minimum_size	location to store the minimum size, or `NULL`.	[out][allow-none]
natural_size	location to store the natural size, or `NULL`.	[out][allow-none]

Since: 3.0

gtk_cell_renderer_get_preferred_height_for_width ()

void
gtk_cell_renderer_get_preferred_height_for_width
                               (GtkCellRenderer *cell,
                                GtkWidget *widget,
                                gint width,
                                gint *minimum_height,
                                gint *natural_height);

Retreives a cell renderers’s minimum and natural height if it were rendered to widget with the specified width .

Parameters

cell	a GtkCellRenderer instance
widget	the GtkWidget this cell will be rendering to
width	the size which is available for allocation
minimum_height	location for storing the minimum size, or `NULL`.	[out][allow-none]
natural_height	location for storing the preferred size, or `NULL`.	[out][allow-none]

Since: 3.0

gtk_cell_renderer_get_preferred_size ()

void
gtk_cell_renderer_get_preferred_size (GtkCellRenderer *cell,
                                      GtkWidget *widget,
                                      GtkRequisition *minimum_size,
                                      GtkRequisition *natural_size);

Retrieves the minimum and natural size of a cell taking into account the widget’s preference for height-for-width management.

Parameters

cell	a GtkCellRenderer instance
widget	the GtkWidget this cell will be rendering to
minimum_size	location for storing the minimum size, or `NULL`.	[out][allow-none]
natural_size	location for storing the natural size, or `NULL`.	[out][allow-none]

Since: 3.0

gtk_cell_renderer_get_preferred_width ()

void
gtk_cell_renderer_get_preferred_width (GtkCellRenderer *cell,
                                       GtkWidget *widget,
                                       gint *minimum_size,
                                       gint *natural_size);

Retreives a renderer’s natural size when rendered to widget .

Parameters

cell	a GtkCellRenderer instance
widget	the GtkWidget this cell will be rendering to
minimum_size	location to store the minimum size, or `NULL`.	[out][allow-none]
natural_size	location to store the natural size, or `NULL`.	[out][allow-none]

Since: 3.0

gtk_cell_renderer_get_preferred_width_for_height ()

void
gtk_cell_renderer_get_preferred_width_for_height
                               (GtkCellRenderer *cell,
                                GtkWidget *widget,
                                gint height,
                                gint *minimum_width,
                                gint *natural_width);

Retreives a cell renderers’s minimum and natural width if it were rendered to widget with the specified height .

Parameters

cell	a GtkCellRenderer instance
widget	the GtkWidget this cell will be rendering to
height	the size which is available for allocation
minimum_width	location for storing the minimum size, or `NULL`.	[out][allow-none]
natural_width	location for storing the preferred size, or `NULL`.	[out][allow-none]

Since: 3.0

gtk_cell_renderer_get_request_mode ()

GtkSizeRequestMode
gtk_cell_renderer_get_request_mode (GtkCellRenderer *cell);

Gets whether the cell renderer prefers a height-for-width layout or a width-for-height layout.

Parameters

cell

a GtkCellRenderer instance

Returns

The GtkSizeRequestMode preferred by this renderer.

Since: 3.0

Types and Values

enum GtkCellRendererState

Tells how a cell is to be rendered.

Members

GTK_CELL_RENDERER_SELECTED	The cell is currently selected, and probably has a selection colored background to render to.
GTK_CELL_RENDERER_PRELIT	The mouse is hovering over the cell.
GTK_CELL_RENDERER_INSENSITIVE	The cell is drawn in an insensitive manner
GTK_CELL_RENDERER_SORTED	The cell is in a sorted row
GTK_CELL_RENDERER_FOCUSED	The cell is in the focus row.
GTK_CELL_RENDERER_EXPANDABLE	The cell is in a row that can be expanded. Since 3.4
GTK_CELL_RENDERER_EXPANDED	The cell is in a row that is expanded. Since 3.4

enum GtkCellRendererMode

Identifies how the user can interact with a particular cell.

Members

GTK_CELL_RENDERER_MODE_INERT	The cell is just for display and cannot be interacted with. Note that this doesn’t mean that eg. the row being drawn can’t be selected -- just that a particular element of it cannot be individually modified.
GTK_CELL_RENDERER_MODE_ACTIVATABLE	The cell can be clicked.
GTK_CELL_RENDERER_MODE_EDITABLE	The cell can be edited or otherwise modified.

struct GtkCellRenderer

struct GtkCellRenderer;

struct GtkCellRendererClass

struct GtkCellRendererClass {
  /* vtable - not signals */
  GtkSizeRequestMode (* get_request_mode)                (GtkCellRenderer      *cell);
  void               (* get_preferred_width)             (GtkCellRenderer      *cell,
                                                          GtkWidget            *widget,
                                                          gint                 *minimum_size,
                                                          gint                 *natural_size);
  void               (* get_preferred_height_for_width)  (GtkCellRenderer      *cell,
                                                          GtkWidget            *widget,
                                                          gint                  width,
                                                          gint                 *minimum_height,
                                                          gint                 *natural_height);
  void               (* get_preferred_height)            (GtkCellRenderer      *cell,
                                                          GtkWidget            *widget,
                                                          gint                 *minimum_size,
                                                          gint                 *natural_size);
  void               (* get_preferred_width_for_height)  (GtkCellRenderer      *cell,
                                                          GtkWidget            *widget,
                                                          gint                  height,
                                                          gint                 *minimum_width,
                                                          gint                 *natural_width);
  void               (* get_aligned_area)                (GtkCellRenderer      *cell,
                                                          GtkWidget            *widget,
							  GtkCellRendererState  flags,
                                                          const GdkRectangle   *cell_area,
                                                          GdkRectangle         *aligned_area);
  void               (* get_size)                        (GtkCellRenderer      *cell,
                                                          GtkWidget            *widget,
                                                          const GdkRectangle   *cell_area,
                                                          gint                 *x_offset,
                                                          gint                 *y_offset,
                                                          gint                 *width,
                                                          gint                 *height);
  void               (* render)                          (GtkCellRenderer      *cell,
                                                          cairo_t              *cr,
                                                          GtkWidget            *widget,
                                                          const GdkRectangle   *background_area,
                                                          const GdkRectangle   *cell_area,
                                                          GtkCellRendererState  flags);
  gboolean           (* activate)                        (GtkCellRenderer      *cell,
                                                          GdkEvent             *event,
                                                          GtkWidget            *widget,
                                                          const gchar          *path,
                                                          const GdkRectangle   *background_area,
                                                          const GdkRectangle   *cell_area,
                                                          GtkCellRendererState  flags);
  GtkCellEditable *  (* start_editing)                   (GtkCellRenderer      *cell,
                                                          GdkEvent             *event,
                                                          GtkWidget            *widget,
                                                          const gchar          *path,
                                                          const GdkRectangle   *background_area,
                                                          const GdkRectangle   *cell_area,
                                                          GtkCellRendererState  flags);

  /* Signals */
  void (* editing_canceled) (GtkCellRenderer *cell);
  void (* editing_started)  (GtkCellRenderer *cell,
			     GtkCellEditable *editable,
			     const gchar     *path);
};

Members

`get_request_mode` ()	Called to gets whether the cell renderer prefers a height-for-width layout or a width-for-height layout.
`get_preferred_width` ()	Called to get a renderer’s natural width.
`get_preferred_height_for_width` ()	Called to get a renderer’s natural height for width.
`get_preferred_height` ()	Called to get a renderer’s natural height.
`get_preferred_width_for_height` ()	Called to get a renderer’s natural width for height.
`get_aligned_area` ()	Called to get the aligned area used by `cell` inside `cell_area` .
`get_size` ()	Called to get the width and height needed to render the cell. Deprecated: 3.0.
`render` ()	Called to render the content of the GtkCellRenderer.
`activate` ()	Called to activate the content of the GtkCellRenderer.
`start_editing` ()	Called to initiate editing the content of the GtkCellRenderer.
`editing_canceled` ()	Signal gets emitted when the user cancels the process of editing a cell.
`editing_started` ()	Signal gets emitted when a cell starts to be edited.

Property Details

The `“cell-background”` property

  “cell-background”          char *

Cell background color as a string.

Owner: GtkCellRenderer

Flags: Write

Default value: NULL

The `“cell-background-gdk”` property

  “cell-background-gdk”      GdkColor *

Cell background as a GdkColor

GtkCellRenderer:cell-background-gdk has been deprecated since version 3.4 and should not be used in newly-written code.

Use “cell-background-rgba” instead.

Owner: GtkCellRenderer

Flags: Read / Write

The `“cell-background-rgba”` property

  “cell-background-rgba”     GdkRGBA *

Cell background as a GdkRGBA

Owner: GtkCellRenderer

Flags: Read / Write

Since: 3.0

The `“cell-background-set”` property

  “cell-background-set”      gboolean

Whether the cell background color is set.

Owner: GtkCellRenderer

Flags: Read / Write

Default value: FALSE

The `“editing”` property

  “editing”                  gboolean

Whether the cell renderer is currently in editing mode.

Owner: GtkCellRenderer

Flags: Read

Default value: FALSE

The `“height”` property

  “height”                   int

The fixed height.

Owner: GtkCellRenderer

Flags: Read / Write

Allowed values: >= -1

Default value: -1

The `“is-expanded”` property

  “is-expanded”              gboolean

Row is an expander row, and is expanded.

Owner: GtkCellRenderer

Flags: Read / Write

Default value: FALSE

The `“is-expander”` property

  “is-expander”              gboolean

Row has children.

Owner: GtkCellRenderer

Flags: Read / Write

Default value: FALSE

The `“mode”` property

  “mode”                     GtkCellRendererMode

Editable mode of the CellRenderer.

Owner: GtkCellRenderer

Flags: Read / Write

Default value: GTK_CELL_RENDERER_MODE_INERT

The `“sensitive”` property

  “sensitive”                gboolean

Display the cell sensitive.

Owner: GtkCellRenderer

Flags: Read / Write

Default value: TRUE

The `“visible”` property

  “visible”                  gboolean

Display the cell.

Owner: GtkCellRenderer

Flags: Read / Write

Default value: TRUE

The `“width”` property

  “width”                    int

The fixed width.

Owner: GtkCellRenderer

Flags: Read / Write

Allowed values: >= -1

Default value: -1

The `“xalign”` property

  “xalign”                   float

The x-align.

Owner: GtkCellRenderer

Flags: Read / Write

Allowed values: [0,1]

Default value: 0.5

The `“xpad”` property

  “xpad”                     guint

The xpad.

Owner: GtkCellRenderer

Flags: Read / Write

Default value: 0

The `“yalign”` property

  “yalign”                   float

The y-align.

Owner: GtkCellRenderer

Flags: Read / Write

Allowed values: [0,1]

Default value: 0.5

The `“ypad”` property

  “ypad”                     guint

The ypad.

Owner: GtkCellRenderer

Flags: Read / Write

Default value: 0

Signal Details

The `“editing-canceled”` signal

void
user_function (GtkCellRenderer *renderer,
               gpointer         user_data)

This signal gets emitted when the user cancels the process of editing a cell. For example, an editable cell renderer could be written to cancel editing when the user presses Escape.

Parameters

renderer	the object which received the signal
user_data	user data set when the signal handler was connected.

Flags: Run First

Since: 2.4

The `“editing-started”` signal

void
user_function (GtkCellRenderer *renderer,
               GtkCellEditable *editable,
               char            *path,
               gpointer         user_data)

This signal gets emitted when a cell starts to be edited. The intended use of this signal is to do special setup on editable , e.g. adding a GtkEntryCompletion or setting up additional columns in a GtkComboBox.

See gtk_cell_editable_start_editing() for information on the lifecycle of the editable and a way to do setup that doesn’t depend on the renderer .

Note that GTK+ doesn't guarantee that cell renderers will continue to use the same kind of widget for editing in future releases, therefore you should check the type of editable before doing any specific setup, as in the following example:

static void
text_editing_started (GtkCellRenderer *cell,
                      GtkCellEditable *editable,
                      const gchar     *path,
                      gpointer         data)
{
  if (GTK_IS_ENTRY (editable))

    {
      GtkEntry *entry = GTK_ENTRY (editable);

      // ... create a GtkEntryCompletion

      gtk_entry_set_completion (entry, completion);
    }
}

Parameters

renderer	the object which received the signal
editable	the GtkCellEditable
path	the path identifying the edited cell
user_data	user data set when the signal handler was connected.

Flags: Run First

Since: 2.6