Gtk.CellArea

g GObject.GInterface GObject.GInterface Gtk.Buildable Gtk.Buildable GObject.GInterface->Gtk.Buildable Gtk.CellLayout Gtk.CellLayout GObject.GInterface->Gtk.CellLayout GObject.InitiallyUnowned GObject.InitiallyUnowned Gtk.CellArea Gtk.CellArea GObject.InitiallyUnowned->Gtk.CellArea GObject.Object GObject.Object GObject.Object->GObject.InitiallyUnowned Gtk.Buildable->Gtk.CellArea Gtk.CellLayout->Gtk.CellArea

Subclasses

Gtk.CellAreaBox

Methods

Inherited

GObject.Object (37), Gtk.Buildable (10), Gtk.CellLayout (9)

Structs

Gtk.CellAreaClass (3), GObject.ObjectClass (5)

class

find_cell_property (property_name)

class

install_cell_property (property_id, pspec)

class

list_cell_properties ()

activate (context, widget, cell_area, flags, edit_only)

activate_cell (widget, renderer, event, cell_area, flags)

add (renderer)

add_focus_sibling (renderer, sibling)

apply_attributes (tree_model, iter, is_expander, is_expanded)

attribute_connect (renderer, attribute, column)

attribute_disconnect (renderer, attribute)

attribute_get_column (renderer, attribute)

cell_get_property (renderer, property_name, value)

cell_set_property (renderer, property_name, value)

copy_context (context)

create_context ()

event (context, widget, event, cell_area, flags)

focus (direction)

foreach (callback, *callback_data)

foreach_alloc (context, widget, cell_area, background_area, callback, *callback_data)

get_cell_allocation (context, widget, renderer, cell_area)

get_cell_at_position (context, widget, cell_area, x, y)

get_current_path_string ()

get_edit_widget ()

get_edited_cell ()

get_focus_cell ()

get_focus_from_sibling (renderer)

get_focus_siblings (renderer)

get_preferred_height (context, widget)

get_preferred_height_for_width (context, widget, width)

get_preferred_width (context, widget)

get_preferred_width_for_height (context, widget, height)

get_request_mode ()

has_renderer (renderer)

inner_cell_area (widget, cell_area)

is_activatable ()

is_focus_sibling (renderer, sibling)

remove (renderer)

remove_focus_sibling (renderer, sibling)

render (context, widget, cr, background_area, cell_area, flags, paint_focus)

request_renderer (renderer, orientation, widget, for_size)

set_focus_cell (renderer)

stop_editing (canceled)

Virtual Methods

Inherited

GObject.Object (7), Gtk.Buildable (10), Gtk.CellLayout (9)

do_activate (context, widget, cell_area, flags, edit_only)

do_add (renderer)

do_apply_attributes (tree_model, iter, is_expander, is_expanded)

do_copy_context (context)

do_create_context ()

do_event (context, widget, event, cell_area, flags)

do_focus (direction)

do_foreach (callback, callback_data)

do_foreach_alloc (context, widget, cell_area, background_area, callback, callback_data)

do_get_cell_property (renderer, property_id, value, pspec)

do_get_preferred_height (context, widget)

do_get_preferred_height_for_width (context, widget, width)

do_get_preferred_width (context, widget)

do_get_preferred_width_for_height (context, widget, height)

do_get_request_mode ()

do_is_activatable ()

do_remove (renderer)

do_render (context, widget, cr, background_area, cell_area, flags, paint_focus)

do_set_cell_property (renderer, property_id, value, pspec)

Properties

Name

Type

Flags

Short Description

edit-widget

Gtk.CellEditable

r

The widget currently editing the edited cell

edited-cell

Gtk.CellRenderer

r

The cell which is currently being edited

focus-cell

Gtk.CellRenderer

r/w

The cell which currently has focus

Signals

Inherited

GObject.Object (1)

Name

Short Description

add-editable

Indicates that editing has started on renderer and that editable should be added to the owning cell-layouting widget at cell_area.

apply-attributes

This signal is emitted whenever applying attributes to area from model

focus-changed

Indicates that focus changed on this area.

remove-editable

Indicates that editing finished on renderer and that editable should be removed from the owning cell-layouting widget.

Fields

Inherited

GObject.Object (1)

Name

Type

Access

Description

parent_instance

GObject.InitiallyUnowned

r

Class Details

class Gtk.CellArea(**kwargs)
Bases

GObject.InitiallyUnowned, Gtk.Buildable, Gtk.CellLayout

Abstract

Yes

Structure

Gtk.CellAreaClass

The Gtk.CellArea is an abstract class for Gtk.CellLayout widgets (also referred to as “layouting widgets”) to interface with an arbitrary number of Gtk.CellRenderers and interact with the user for a given Gtk.TreeModel row.

The cell area handles events, focus navigation, drawing and size requests and allocations for a given row of data.

Usually users dont have to interact with the Gtk.CellArea directly unless they are implementing a cell-layouting widget themselves.

Requesting area sizes

As outlined in GtkWidget’s geometry management section, GTK+ uses a height-for-width geometry management system to compute the sizes of widgets and user interfaces. Gtk.CellArea uses the same semantics to calculate the size of an area for an arbitrary number of Gtk.TreeModel rows.

When requesting the size of a cell area one needs to calculate the size for a handful of rows, and this will be done differently by different layouting widgets. For instance a Gtk.TreeViewColumn always lines up the areas from top to bottom while a Gtk.IconView on the other hand might enforce that all areas received the same width and wrap the areas around, requesting height for more cell areas when allocated less width.

It’s also important for areas to maintain some cell alignments with areas rendered for adjacent rows (cells can appear “columnized” inside an area even when the size of cells are different in each row). For this reason the Gtk.CellArea uses a Gtk.CellAreaContext object to store the alignments and sizes along the way (as well as the overall largest minimum and natural size for all the rows which have been calculated with the said context).

The Gtk.CellAreaContext is an opaque object specific to the Gtk.CellArea which created it (see Gtk.CellArea.create_context()). The owning cell-layouting widget can create as many contexts as it wishes to calculate sizes of rows which should receive the same size in at least one orientation (horizontally or vertically), However, it’s important that the same Gtk.CellAreaContext which was used to request the sizes for a given Gtk.TreeModel row be used when rendering or processing events for that row.

In order to request the width of all the rows at the root level of a Gtk.TreeModel one would do the following:

GtkTreeIter iter;
gint        minimum_width;
gint        natural_width;

valid = gtk_tree_model_get_iter_first (model, &iter);
while (valid)
  {
    gtk_cell_area_apply_attributes (area, model, &iter, FALSE, FALSE);
    gtk_cell_area_get_preferred_width (area, context, widget, NULL, NULL);

    valid = gtk_tree_model_iter_next (model, &iter);
  }
gtk_cell_area_context_get_preferred_width (context, &minimum_width, &natural_width);

Note that in this example it’s not important to observe the returned minimum and natural width of the area for each row unless the cell-layouting object is actually interested in the widths of individual rows. The overall width is however stored in the accompanying Gtk.CellAreaContext object and can be consulted at any time.

This can be useful since Gtk.CellLayout widgets usually have to support requesting and rendering rows in treemodels with an exceedingly large amount of rows. The Gtk.CellLayout widget in that case would calculate the required width of the rows in an idle or timeout source (see GLib.timeout_add()) and when the widget is requested its actual width in Gtk.Widget.do_get_preferred_width() it can simply consult the width accumulated so far in the Gtk.CellAreaContext object.

A simple example where rows are rendered from top to bottom and take up the full width of the layouting widget would look like:

static void
foo_get_preferred_width (GtkWidget       *widget,
                         gint            *minimum_size,
                         gint            *natural_size)
{
  Foo        *foo  = FOO (widget);
  FooPrivate *priv = foo->priv;

  foo_ensure_at_least_one_handfull_of_rows_have_been_requested (foo);

  gtk_cell_area_context_get_preferred_width (priv->context, minimum_size, natural_size);
}

In the above example the Foo widget has to make sure that some row sizes have been calculated (the amount of rows that Foo judged was appropriate to request space for in a single timeout iteration) before simply returning the amount of space required by the area via the Gtk.CellAreaContext.

Requesting the height for width (or width for height) of an area is a similar task except in this case the Gtk.CellAreaContext does not store the data (actually, it does not know how much space the layouting widget plans to allocate it for every row. It’s up to the layouting widget to render each row of data with the appropriate height and width which was requested by the Gtk.CellArea).

In order to request the height for width of all the rows at the root level of a Gtk.TreeModel one would do the following:

GtkTreeIter iter;
gint        minimum_height;
gint        natural_height;
gint        full_minimum_height = 0;
gint        full_natural_height = 0;

valid = gtk_tree_model_get_iter_first (model, &iter);
while (valid)
  {
    gtk_cell_area_apply_attributes (area, model, &iter, FALSE, FALSE);
    gtk_cell_area_get_preferred_height_for_width (area, context, widget,
                                                  width, &minimum_height, &natural_height);

    if (width_is_for_allocation)
       cache_row_height (&iter, minimum_height, natural_height);

    full_minimum_height += minimum_height;
    full_natural_height += natural_height;

    valid = gtk_tree_model_iter_next (model, &iter);
  }

Note that in the above example we would need to cache the heights returned for each row so that we would know what sizes to render the areas for each row. However we would only want to really cache the heights if the request is intended for the layouting widgets real allocation.

In some cases the layouting widget is requested the height for an arbitrary for_width, this is a special case for layouting widgets who need to request size for tens of thousands of rows. For this case it’s only important that the layouting widget calculate one reasonably sized chunk of rows and return that height synchronously. The reasoning here is that any layouting widget is at least capable of synchronously calculating enough height to fill the screen height (or scrolled window height) in response to a single call to Gtk.Widget.do_get_preferred_height_for_width(). Returning a perfect height for width that is larger than the screen area is inconsequential since after the layouting receives an allocation from a scrolled window it simply continues to drive the scrollbar values while more and more height is required for the row heights that are calculated in the background.

Rendering Areas

Once area sizes have been aquired at least for the rows in the visible area of the layouting widget they can be rendered at Gtk.Widget.do_draw() time.

A crude example of how to render all the rows at the root level runs as follows:

GtkAllocation allocation;
GdkRectangle  cell_area = { 0, };
GtkTreeIter   iter;
gint          minimum_width;
gint          natural_width;

gtk_widget_get_allocation (widget, &allocation);
cell_area.width = allocation.width;

valid = gtk_tree_model_get_iter_first (model, &iter);
while (valid)
  {
    cell_area.height = get_cached_height_for_row (&iter);

    gtk_cell_area_apply_attributes (area, model, &iter, FALSE, FALSE);
    gtk_cell_area_render (area, context, widget, cr,
                          &cell_area, &cell_area, state_flags, FALSE);

    cell_area.y += cell_area.height;

    valid = gtk_tree_model_iter_next (model, &iter);
  }

Note that the cached height in this example really depends on how the layouting widget works. The layouting widget might decide to give every row its minimum or natural height or, if the model content is expected to fit inside the layouting widget without scrolling, it would make sense to calculate the allocation for each row at Gtk.Widget ::size-allocate time using Gtk.distribute_natural_allocation().

Handling Events and Driving Keyboard Focus

Passing events to the area is as simple as handling events on any normal widget and then passing them to the Gtk.CellArea.event() API as they come in. Usually Gtk.CellArea is only interested in button events, however some customized derived areas can be implemented who are interested in handling other events. Handling an event can trigger the Gtk.CellArea ::focus-changed signal to fire; as well as Gtk.CellArea ::add-editable in the case that an editable cell was clicked and needs to start editing. You can call Gtk.CellArea.stop_editing() at any time to cancel any cell editing that is currently in progress.

The Gtk.CellArea drives keyboard focus from cell to cell in a way similar to Gtk.Widget. For layouting widgets that support giving focus to cells it’s important to remember to pass Gtk.CellRendererState.FOCUSED to the area functions for the row that has focus and to tell the area to paint the focus at render time.

Layouting widgets that accept focus on cells should implement the Gtk.Widget.do_focus() virtual method. The layouting widget is always responsible for knowing where Gtk.TreeModel rows are rendered inside the widget, so at Gtk.Widget.do_focus() time the layouting widget should use the Gtk.CellArea methods to navigate focus inside the area and then observe the Gtk.DirectionType to pass the focus to adjacent rows and areas.

A basic example of how the Gtk.Widget.do_focus() virtual method should be implemented:

static gboolean
foo_focus (GtkWidget       *widget,
           GtkDirectionType direction)
{
  Foo        *foo  = FOO (widget);
  FooPrivate *priv = foo->priv;
  gint        focus_row;
  gboolean    have_focus = FALSE;

  focus_row = priv->focus_row;

  if (!gtk_widget_has_focus (widget))
    gtk_widget_grab_focus (widget);

  valid = gtk_tree_model_iter_nth_child (priv->model, &iter, NULL, priv->focus_row);
  while (valid)
    {
      gtk_cell_area_apply_attributes (priv->area, priv->model, &iter, FALSE, FALSE);

      if (gtk_cell_area_focus (priv->area, direction))
        {
           priv->focus_row = focus_row;
           have_focus = TRUE;
           break;
        }
      else
        {
          if (direction == GTK_DIR_RIGHT ||
              direction == GTK_DIR_LEFT)
            break;
          else if (direction == GTK_DIR_UP ||
                   direction == GTK_DIR_TAB_BACKWARD)
           {
              if (focus_row == 0)
                break;
              else
               {
                  focus_row--;
                  valid = gtk_tree_model_iter_nth_child (priv->model, &iter, NULL, focus_row);
               }
            }
          else
            {
              if (focus_row == last_row)
                break;
              else
                {
                  focus_row++;
                  valid = gtk_tree_model_iter_next (priv->model, &iter);
                }
            }
        }
    }
    return have_focus;
}

Note that the layouting widget is responsible for matching the Gtk.DirectionType values to the way it lays out its cells.

Cell Properties

The Gtk.CellArea introduces cell properties for Gtk.CellRenderers in very much the same way that Gtk.Container introduces ‘child properties [child-properties]’ for Gtk.Widgets. This provides some general interfaces for defining the relationship cell areas have with their cells. For instance in a Gtk.CellAreaBox a cell might “expand” and receive extra space when the area is allocated more than its full natural request, or a cell might be configured to “align” with adjacent rows which were requested and rendered with the same Gtk.CellAreaContext.

Use Gtk.CellAreaClass.install_cell_property() to install cell properties for a cell area class and Gtk.CellAreaClass.find_cell_property() or Gtk.CellAreaClass.list_cell_properties() to get information about existing cell properties.

To set the value of a cell property, use Gtk.CellArea.cell_set_property(), gtk_cell_area_cell_set() or gtk_cell_area_cell_set_valist(). To obtain the value of a cell property, use Gtk.CellArea.cell_get_property(), gtk_cell_area_cell_get() or gtk_cell_area_cell_get_valist().

classmethod find_cell_property(property_name)
Parameters

property_name (str) – the name of the child property to find

Returns

the GObject.ParamSpec of the child property or None if self has no child property with that name.

Return type

GObject.ParamSpec

Finds a cell property of a cell area class by name.

New in version 3.0.

classmethod install_cell_property(property_id, pspec)
Parameters

Installs a cell property on a cell area class.

New in version 3.0.

classmethod list_cell_properties()
Returns

a newly allocated None-terminated array of GObject.ParamSpec. The array must be freed with GLib.free().

Return type

[GObject.ParamSpec]

Returns all cell properties of a cell area class.

New in version 3.0.

activate(context, widget, cell_area, flags, edit_only)[source]
Parameters
Returns

Whether self was successfully activated.

Return type

bool

Activates self, usually by activating the currently focused cell, however some subclasses which embed widgets in the area can also activate a widget if it currently has the focus.

New in version 3.0.

activate_cell(widget, renderer, event, cell_area, flags)[source]
Parameters
Returns

whether cell activation was successful

Return type

bool

This is used by Gtk.CellArea subclasses when handling events to activate cells, the base Gtk.CellArea class activates cells for keyboard events for free in its own Gtk.CellArea->activate() implementation.

New in version 3.0.

add(renderer)[source]
Parameters

renderer (Gtk.CellRenderer) – the Gtk.CellRenderer to add to self

Adds renderer to self with the default child cell properties.

New in version 3.0.

add_focus_sibling(renderer, sibling)[source]
Parameters

Adds sibling to renderer’s focusable area, focus will be drawn around renderer and all of its siblings if renderer can focus for a given row.

Events handled by focus siblings can also activate the given focusable renderer.

New in version 3.0.

apply_attributes(tree_model, iter, is_expander, is_expanded)[source]
Parameters

Applies any connected attributes to the renderers in self by pulling the values from tree_model.

New in version 3.0.

attribute_connect(renderer, attribute, column)[source]
Parameters

Connects an attribute to apply values from column for the Gtk.TreeModel in use.

New in version 3.0.

attribute_disconnect(renderer, attribute)[source]
Parameters

Disconnects attribute for the renderer in self so that attribute will no longer be updated with values from the model.

New in version 3.0.

attribute_get_column(renderer, attribute)[source]
Parameters
Returns

the model column, or -1

Return type

int

Returns the model column that an attribute has been mapped to, or -1 if the attribute is not mapped.

New in version 3.14.

cell_get_property(renderer, property_name, value)[source]
Parameters

Gets the value of a cell property for renderer in self.

New in version 3.0.

cell_set_property(renderer, property_name, value)[source]
Parameters

Sets a cell property for renderer in self.

New in version 3.0.

copy_context(context)[source]
Parameters

context (Gtk.CellAreaContext) – the Gtk.CellAreaContext to copy

Returns

a newly created Gtk.CellAreaContext copy of context.

Return type

Gtk.CellAreaContext

This is sometimes needed for cases where rows need to share alignments in one orientation but may be separately grouped in the opposing orientation.

For instance, Gtk.IconView creates all icons (rows) to have the same width and the cells theirin to have the same horizontal alignments. However each row of icons may have a separate collective height. Gtk.IconView uses this to request the heights of each row based on a context which was already used to request all the row widths that are to be displayed.

New in version 3.0.

create_context()[source]
Returns

a newly created Gtk.CellAreaContext which can be used with self.

Return type

Gtk.CellAreaContext

Creates a Gtk.CellAreaContext to be used with self for all purposes. Gtk.CellAreaContext stores geometry information for rows for which it was operated on, it is important to use the same context for the same row of data at all times (i.e. one should render and handle events with the same Gtk.CellAreaContext which was used to request the size of those rows of data).

New in version 3.0.

event(context, widget, event, cell_area, flags)[source]
Parameters
Returns

True if the event was handled by self.

Return type

int

Delegates event handling to a Gtk.CellArea.

New in version 3.0.

focus(direction)[source]
Parameters

direction (Gtk.DirectionType) – the Gtk.DirectionType

Returns

True if focus remains inside self as a result of this call.

Return type

bool

This should be called by the self’s owning layout widget when focus is to be passed to self, or moved within self for a given direction and row data.

Implementing Gtk.CellArea classes should implement this method to receive and navigate focus in its own way particular to how it lays out cells.

New in version 3.0.

foreach(callback, *callback_data)[source]
Parameters

Calls callback for every Gtk.CellRenderer in self.

New in version 3.0.

foreach_alloc(context, widget, cell_area, background_area, callback, *callback_data)[source]
Parameters

Calls callback for every Gtk.CellRenderer in self with the allocated rectangle inside cell_area.

New in version 3.0.

get_cell_allocation(context, widget, renderer, cell_area)[source]
Parameters
Returns

where to store the allocation for renderer

Return type

allocation: Gdk.Rectangle

Derives the allocation of renderer inside self if self were to be renderered in cell_area.

New in version 3.0.

get_cell_at_position(context, widget, cell_area, x, y)[source]
Parameters
Returns

the Gtk.CellRenderer at x and y.

alloc_area

where to store the inner allocated area of the returned cell renderer, or None.

Return type

(Gtk.CellRenderer, alloc_area: Gdk.Rectangle)

Gets the Gtk.CellRenderer at x and y coordinates inside self and optionally returns the full cell allocation for it inside cell_area.

New in version 3.0.

get_current_path_string()[source]
Returns

The current Gtk.TreePath string for the current attributes applied to self. This string belongs to the area and should not be freed.

Return type

str

Gets the current Gtk.TreePath string for the currently applied Gtk.TreeIter, this is implicitly updated when Gtk.CellArea.apply_attributes() is called and can be used to interact with renderers from Gtk.CellArea subclasses.

New in version 3.0.

get_edit_widget()[source]
Returns

The currently active Gtk.CellEditable widget

Return type

Gtk.CellEditable

Gets the Gtk.CellEditable widget currently used to edit the currently edited cell.

New in version 3.0.

get_edited_cell()[source]
Returns

The currently edited Gtk.CellRenderer

Return type

Gtk.CellRenderer

Gets the Gtk.CellRenderer in self that is currently being edited.

New in version 3.0.

get_focus_cell()[source]
Returns

the currently focused cell in self.

Return type

Gtk.CellRenderer

Retrieves the currently focused cell for self

New in version 3.0.

get_focus_from_sibling(renderer)[source]
Parameters

renderer (Gtk.CellRenderer) – the Gtk.CellRenderer

Returns

the Gtk.CellRenderer for which renderer is a sibling, or None.

Return type

Gtk.CellRenderer or None

Gets the Gtk.CellRenderer which is expected to be focusable for which renderer is, or may be a sibling.

This is handy for Gtk.CellArea subclasses when handling events, after determining the renderer at the event location it can then chose to activate the focus cell for which the event cell may have been a sibling.

New in version 3.0.

get_focus_siblings(renderer)[source]
Parameters

renderer (Gtk.CellRenderer) – the Gtk.CellRenderer expected to have focus

Returns

A GLib.List of Gtk.CellRenderers. The returned list is internal and should not be freed.

Return type

[Gtk.CellRenderer]

Gets the focus sibling cell renderers for renderer.

New in version 3.0.

get_preferred_height(context, widget)[source]
Parameters
Returns

minimum_height

location to store the minimum height, or None

natural_height

location to store the natural height, or None

Return type

(minimum_height: int, natural_height: int)

Retrieves a cell area’s initial minimum and natural height.

self will store some geometrical information in context along the way; when requesting sizes over an arbitrary number of rows, it’s not important to check the minimum_height and natural_height of this call but rather to consult Gtk.CellAreaContext.get_preferred_height() after a series of requests.

New in version 3.0.

get_preferred_height_for_width(context, widget, width)[source]
Parameters
Returns

minimum_height

location to store the minimum height, or None

natural_height

location to store the natural height, or None

Return type

(minimum_height: int, natural_height: int)

Retrieves a cell area’s minimum and natural height if it would be given the specified width.

self stores some geometrical information in context along the way while calling Gtk.CellArea.get_preferred_width(). It’s important to perform a series of Gtk.CellArea.get_preferred_width() requests with context first and then call Gtk.CellArea.get_preferred_height_for_width() on each cell area individually to get the height for width of each fully requested row.

If at some point, the width of a single row changes, it should be requested with Gtk.CellArea.get_preferred_width() again and then the full width of the requested rows checked again with Gtk.CellAreaContext.get_preferred_width().

New in version 3.0.

get_preferred_width(context, widget)[source]
Parameters
Returns

minimum_width

location to store the minimum width, or None

natural_width

location to store the natural width, or None

Return type

(minimum_width: int, natural_width: int)

Retrieves a cell area’s initial minimum and natural width.

self will store some geometrical information in context along the way; when requesting sizes over an arbitrary number of rows, it’s not important to check the minimum_width and natural_width of this call but rather to consult Gtk.CellAreaContext.get_preferred_width() after a series of requests.

New in version 3.0.

get_preferred_width_for_height(context, widget, height)[source]
Parameters
Returns

minimum_width

location to store the minimum width, or None

natural_width

location to store the natural width, or None

Return type

(minimum_width: int, natural_width: int)

Retrieves a cell area’s minimum and natural width if it would be given the specified height.

self stores some geometrical information in context along the way while calling Gtk.CellArea.get_preferred_height(). It’s important to perform a series of Gtk.CellArea.get_preferred_height() requests with context first and then call Gtk.CellArea.get_preferred_width_for_height() on each cell area individually to get the height for width of each fully requested row.

If at some point, the height of a single row changes, it should be requested with Gtk.CellArea.get_preferred_height() again and then the full height of the requested rows checked again with Gtk.CellAreaContext.get_preferred_height().

New in version 3.0.

get_request_mode()[source]
Returns

The Gtk.SizeRequestMode preferred by self.

Return type

Gtk.SizeRequestMode

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

New in version 3.0.

has_renderer(renderer)[source]
Parameters

renderer (Gtk.CellRenderer) – the Gtk.CellRenderer to check

Returns

True if renderer is in the self.

Return type

bool

Checks if self contains renderer.

New in version 3.0.

inner_cell_area(widget, cell_area)[source]
Parameters
  • widget (Gtk.Widget) – the Gtk.Widget that self is rendering onto

  • cell_area (Gdk.Rectangle) – the widget relative coordinates where one of self’s cells is to be placed

Returns

the return location for the inner cell area

Return type

inner_area: Gdk.Rectangle

This is a convenience function for Gtk.CellArea implementations to get the inner area where a given Gtk.CellRenderer will be rendered. It removes any padding previously added by Gtk.CellArea.request_renderer().

New in version 3.0.

is_activatable()[source]
Returns

whether self can do anything when activated.

Return type

bool

Returns whether the area can do anything when activated, after applying new attributes to self.

New in version 3.0.

is_focus_sibling(renderer, sibling)[source]
Parameters
Returns

True if sibling is a focus sibling of renderer

Return type

bool

Returns whether sibling is one of renderer’s focus siblings (see Gtk.CellArea.add_focus_sibling()).

New in version 3.0.

remove(renderer)[source]
Parameters

renderer (Gtk.CellRenderer) – the Gtk.CellRenderer to remove from self

Removes renderer from self.

New in version 3.0.

remove_focus_sibling(renderer, sibling)[source]
Parameters

Removes sibling from renderer’s focus sibling list (see Gtk.CellArea.add_focus_sibling()).

New in version 3.0.

render(context, widget, cr, background_area, cell_area, flags, paint_focus)[source]
Parameters

Renders self’s cells according to self’s layout onto widget at the given coordinates.

New in version 3.0.

request_renderer(renderer, orientation, widget, for_size)[source]
Parameters
Returns

minimum_size

location to store the minimum size, or None

natural_size

location to store the natural size, or None

Return type

(minimum_size: int, natural_size: int)

This is a convenience function for Gtk.CellArea implementations to request size for cell renderers. It’s important to use this function to request size and then use Gtk.CellArea.inner_cell_area() at render and event time since this function will add padding around the cell for focus painting.

New in version 3.0.

set_focus_cell(renderer)[source]
Parameters

renderer (Gtk.CellRenderer) – the Gtk.CellRenderer to give focus to

Explicitly sets the currently focused cell to renderer.

This is generally called by implementations of Gtk.CellArea.do_focus() or Gtk.CellArea.do_event(), however it can also be used to implement functions such as Gtk.TreeView.set_cursor_on_cell().

New in version 3.0.

stop_editing(canceled)[source]
Parameters

canceled (bool) – whether editing was canceled.

Explicitly stops the editing of the currently edited cell.

If canceled is True, the currently edited cell renderer will emit the ::editing-canceled signal, otherwise the the ::editing-done signal will be emitted on the current edit widget.

See Gtk.CellArea.get_edited_cell() and Gtk.CellArea.get_edit_widget().

New in version 3.0.

do_activate(context, widget, cell_area, flags, edit_only) virtual
Parameters
Returns

Whether area was successfully activated.

Return type

bool

Activates area, usually by activating the currently focused cell, however some subclasses which embed widgets in the area can also activate a widget if it currently has the focus.

New in version 3.0.

do_add(renderer) virtual
Parameters

renderer (Gtk.CellRenderer) – the Gtk.CellRenderer to add to area

Adds renderer to area with the default child cell properties.

New in version 3.0.

do_apply_attributes(tree_model, iter, is_expander, is_expanded) virtual
Parameters

Applies any connected attributes to the renderers in area by pulling the values from tree_model.

New in version 3.0.

do_copy_context(context) virtual
Parameters

context (Gtk.CellAreaContext) – the Gtk.CellAreaContext to copy

Returns

a newly created Gtk.CellAreaContext copy of context.

Return type

Gtk.CellAreaContext

This is sometimes needed for cases where rows need to share alignments in one orientation but may be separately grouped in the opposing orientation.

For instance, Gtk.IconView creates all icons (rows) to have the same width and the cells theirin to have the same horizontal alignments. However each row of icons may have a separate collective height. Gtk.IconView uses this to request the heights of each row based on a context which was already used to request all the row widths that are to be displayed.

New in version 3.0.

do_create_context() virtual
Returns

a newly created Gtk.CellAreaContext which can be used with area.

Return type

Gtk.CellAreaContext

Creates a Gtk.CellAreaContext to be used with area for all purposes. Gtk.CellAreaContext stores geometry information for rows for which it was operated on, it is important to use the same context for the same row of data at all times (i.e. one should render and handle events with the same Gtk.CellAreaContext which was used to request the size of those rows of data).

New in version 3.0.

do_event(context, widget, event, cell_area, flags) virtual
Parameters
Returns

True if the event was handled by area.

Return type

int

Delegates event handling to a Gtk.CellArea.

New in version 3.0.

do_focus(direction) virtual
Parameters

direction (Gtk.DirectionType) – the Gtk.DirectionType

Returns

True if focus remains inside area as a result of this call.

Return type

bool

This should be called by the area’s owning layout widget when focus is to be passed to area, or moved within area for a given direction and row data.

Implementing Gtk.CellArea classes should implement this method to receive and navigate focus in its own way particular to how it lays out cells.

New in version 3.0.

do_foreach(callback, callback_data) virtual
Parameters

Calls callback for every Gtk.CellRenderer in area.

New in version 3.0.

do_foreach_alloc(context, widget, cell_area, background_area, callback, callback_data) virtual
Parameters

Calls callback for every Gtk.CellRenderer in area with the allocated rectangle inside cell_area.

New in version 3.0.

do_get_cell_property(renderer, property_id, value, pspec) virtual
Parameters
do_get_preferred_height(context, widget) virtual
Parameters
Returns

minimum_height

location to store the minimum height, or None

natural_height

location to store the natural height, or None

Return type

(minimum_height: int, natural_height: int)

Retrieves a cell area’s initial minimum and natural height.

area will store some geometrical information in context along the way; when requesting sizes over an arbitrary number of rows, it’s not important to check the minimum_height and natural_height of this call but rather to consult Gtk.CellAreaContext.get_preferred_height() after a series of requests.

New in version 3.0.

do_get_preferred_height_for_width(context, widget, width) virtual
Parameters
Returns

minimum_height

location to store the minimum height, or None

natural_height

location to store the natural height, or None

Return type

(minimum_height: int, natural_height: int)

Retrieves a cell area’s minimum and natural height if it would be given the specified width.

area stores some geometrical information in context along the way while calling Gtk.CellArea.get_preferred_width(). It’s important to perform a series of Gtk.CellArea.get_preferred_width() requests with context first and then call Gtk.CellArea.get_preferred_height_for_width() on each cell area individually to get the height for width of each fully requested row.

If at some point, the width of a single row changes, it should be requested with Gtk.CellArea.get_preferred_width() again and then the full width of the requested rows checked again with Gtk.CellAreaContext.get_preferred_width().

New in version 3.0.

do_get_preferred_width(context, widget) virtual
Parameters
Returns

minimum_width

location to store the minimum width, or None

natural_width

location to store the natural width, or None

Return type

(minimum_width: int, natural_width: int)

Retrieves a cell area’s initial minimum and natural width.

area will store some geometrical information in context along the way; when requesting sizes over an arbitrary number of rows, it’s not important to check the minimum_width and natural_width of this call but rather to consult Gtk.CellAreaContext.get_preferred_width() after a series of requests.

New in version 3.0.

do_get_preferred_width_for_height(context, widget, height) virtual
Parameters
Returns

minimum_width

location to store the minimum width, or None

natural_width

location to store the natural width, or None

Return type

(minimum_width: int, natural_width: int)

Retrieves a cell area’s minimum and natural width if it would be given the specified height.

area stores some geometrical information in context along the way while calling Gtk.CellArea.get_preferred_height(). It’s important to perform a series of Gtk.CellArea.get_preferred_height() requests with context first and then call Gtk.CellArea.get_preferred_width_for_height() on each cell area individually to get the height for width of each fully requested row.

If at some point, the height of a single row changes, it should be requested with Gtk.CellArea.get_preferred_height() again and then the full height of the requested rows checked again with Gtk.CellAreaContext.get_preferred_height().

New in version 3.0.

do_get_request_mode() virtual
Returns

The Gtk.SizeRequestMode preferred by area.

Return type

Gtk.SizeRequestMode

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

New in version 3.0.

do_is_activatable() virtual
Returns

whether area can do anything when activated.

Return type

bool

Returns whether the area can do anything when activated, after applying new attributes to area.

New in version 3.0.

do_remove(renderer) virtual
Parameters

renderer (Gtk.CellRenderer) – the Gtk.CellRenderer to remove from area

Removes renderer from area.

New in version 3.0.

do_render(context, widget, cr, background_area, cell_area, flags, paint_focus) virtual
Parameters

Renders area’s cells according to area’s layout onto widget at the given coordinates.

New in version 3.0.

do_set_cell_property(renderer, property_id, value, pspec) virtual
Parameters

Signal Details

Gtk.CellArea.signals.add_editable(cell_area, renderer, editable, cell_area, path)
Signal Name

add-editable

Flags

RUN_FIRST

Parameters

Indicates that editing has started on renderer and that editable should be added to the owning cell-layouting widget at cell_area.

New in version 3.0.

Gtk.CellArea.signals.apply_attributes(cell_area, model, iter, is_expander, is_expanded)
Signal Name

apply-attributes

Flags

RUN_FIRST

Parameters
  • cell_area (Gtk.CellArea) – The object which received the signal

  • model (Gtk.TreeModel) – the Gtk.TreeModel to apply the attributes from

  • iter (Gtk.TreeIter) – the Gtk.TreeIter indicating which row to apply the attributes of

  • is_expander (bool) – whether the view shows children for this row

  • is_expanded (bool) – whether the view is currently showing the children of this row

This signal is emitted whenever applying attributes to area from model

New in version 3.0.

Gtk.CellArea.signals.focus_changed(cell_area, renderer, path)
Signal Name

focus-changed

Flags

RUN_FIRST

Parameters

Indicates that focus changed on this area. This signal is emitted either as a result of focus handling or event handling.

It’s possible that the signal is emitted even if the currently focused renderer did not change, this is because focus may change to the same renderer in the same cell area for a different row of data.

New in version 3.0.

Gtk.CellArea.signals.remove_editable(cell_area, renderer, editable)
Signal Name

remove-editable

Flags

RUN_FIRST

Parameters

Indicates that editing finished on renderer and that editable should be removed from the owning cell-layouting widget.

New in version 3.0.

Property Details

Gtk.CellArea.props.edit_widget
Name

edit-widget

Type

Gtk.CellEditable

Default Value

None

Flags

READABLE

The widget currently editing the edited cell

This property is read-only and only changes as a result of a call Gtk.CellArea.activate_cell().

New in version 3.0.

Gtk.CellArea.props.edited_cell
Name

edited-cell

Type

Gtk.CellRenderer

Default Value

None

Flags

READABLE

The cell in the area that is currently edited

This property is read-only and only changes as a result of a call Gtk.CellArea.activate_cell().

New in version 3.0.

Gtk.CellArea.props.focus_cell
Name

focus-cell

Type

Gtk.CellRenderer

Default Value

None

Flags

READABLE, WRITABLE

The cell in the area that currently has focus

New in version 3.0.