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GtkCellLayout

GtkCellLayout — An interface for packing cells

Types and Values

Object Hierarchy

    GInterface
    ╰── GtkCellLayout

Prerequisites

GtkCellLayout requires GObject.

Known Implementations

GtkCellLayout is implemented by GtkCellView, GtkComboBox, GtkComboBoxEntry, GtkComboBoxText, GtkEntryCompletion, GtkIconView and GtkTreeViewColumn.

Includes

#include <gtk/gtk.h>

Description

GtkCellLayout is an interface to be implemented by all objects which want to provide a GtkTreeViewColumn-like API for packing cells, setting attributes and data funcs.

One of the notable features provided by implementations of GtkCellLayout are attributes. Attributes let you set the properties in flexible ways. They can just be set to constant values like regular properties. But they can also be mapped to a column of the underlying tree model with gtk_cell_layout_set_attributes(), which means that the value of the attribute can change from cell to cell as they are rendered by the cell renderer. Finally, it is possible to specify a function with gtk_cell_layout_set_cell_data_func() that is called to determine the value of the attribute for each cell that is rendered.

GtkCellLayouts as GtkBuildable

Implementations of GtkCellLayout which also implement the GtkBuildable interface (GtkCellView, GtkIconView, GtkComboBox, GtkComboBoxEntry, GtkEntryCompletion, GtkTreeViewColumn) accept GtkCellRenderer objects as <child> elements in UI definitions. They support a custom <attributes> element for their children, which can contain multiple <attribute> elements. Each <attribute> element has a name attribute which specifies a property of the cell renderer; the content of the element is the attribute value.

Example 21. A UI definition fragment specifying attributes

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<object class="GtkCellView">
  <child>
    <object class="GtkCellRendererText"/>
    <attributes>
      <attribute name="text">0</attribute>
    </attributes>
  </child>"
</object>

Functions

GtkCellLayoutDataFunc ()

void
(*GtkCellLayoutDataFunc) (GtkCellLayout *cell_layout,
                          GtkCellRenderer *cell,
                          GtkTreeModel *tree_model,
                          GtkTreeIter *iter,
                          gpointer data);

A function which should set the value of cell_layout's cell renderer(s) as appropriate.

Parameters

cell_layout

a GtkCellLayout

 

cell

the cell renderer whose value is to be set

 

tree_model

the model

 

iter

a GtkTreeIter indicating the row to set the value for

 

data

user data passed to gtk_cell_layout_set_cell_data_func()

 

gtk_cell_layout_pack_start ()

void
gtk_cell_layout_pack_start (GtkCellLayout *cell_layout,
                            GtkCellRenderer *cell,
                            gboolean expand);

Packs the cell into the beginning of cell_layout . If expand is FALSE, then the cell is allocated no more space than it needs. Any unused space is divided evenly between cells for which expand is TRUE.

Note that reusing the same cell renderer is not supported.

Parameters

cell_layout

A GtkCellLayout.

 

cell

A GtkCellRenderer.

 

expand

TRUE if cell is to be given extra space allocated to cell_layout .

 

Since: 2.4


gtk_cell_layout_pack_end ()

void
gtk_cell_layout_pack_end (GtkCellLayout *cell_layout,
                          GtkCellRenderer *cell,
                          gboolean expand);

Adds the cell to the end of cell_layout . If expand is FALSE, then the cell is allocated no more space than it needs. Any unused space is divided evenly between cells for which expand is TRUE.

Note that reusing the same cell renderer is not supported.

Parameters

cell_layout

A GtkCellLayout.

 

cell

A GtkCellRenderer.

 

expand

TRUE if cell is to be given extra space allocated to cell_layout .

 

Since: 2.4


gtk_cell_layout_get_cells ()

GList *
gtk_cell_layout_get_cells (GtkCellLayout *cell_layout);

Returns the cell renderers which have been added to cell_layout .

Parameters

cell_layout

a GtkCellLayout

 

Returns

a list of cell renderers. The list, but not the renderers has been newly allocated and should be freed with g_list_free() when no longer needed.

[element-type GtkCellRenderer][transfer container]

Since: 2.12


gtk_cell_layout_reorder ()

void
gtk_cell_layout_reorder (GtkCellLayout *cell_layout,
                         GtkCellRenderer *cell,
                         gint position);

Re-inserts cell at position . Note that cell has already to be packed into cell_layout for this to function properly.

Parameters

cell_layout

A GtkCellLayout.

 

cell

A GtkCellRenderer to reorder.

 

position

New position to insert cell at.

 

Since: 2.4


gtk_cell_layout_clear ()

void
gtk_cell_layout_clear (GtkCellLayout *cell_layout);

Unsets all the mappings on all renderers on cell_layout and removes all renderers from cell_layout .

Parameters

cell_layout

A GtkCellLayout.

 

Since: 2.4


gtk_cell_layout_set_attributes ()

void
gtk_cell_layout_set_attributes (GtkCellLayout *cell_layout,
                                GtkCellRenderer *cell,
                                ...);

Sets the attributes in list as the attributes of cell_layout . The attributes should be in attribute/column order, as in gtk_cell_layout_add_attribute(). All existing attributes are removed, and replaced with the new attributes.

Parameters

cell_layout

A GtkCellLayout.

 

cell

A GtkCellRenderer.

 

Since: 2.4


gtk_cell_layout_add_attribute ()

void
gtk_cell_layout_add_attribute (GtkCellLayout *cell_layout,
                               GtkCellRenderer *cell,
                               const gchar *attribute,
                               gint column);

Adds an attribute mapping to the list in cell_layout . The column is the column of the model to get a value from, and the attribute is the parameter on cell to be set from the value. So for example if column 2 of the model contains strings, you could have the "text" attribute of a GtkCellRendererText get its values from column 2.

Parameters

cell_layout

A GtkCellLayout.

 

cell

A GtkCellRenderer.

 

attribute

An attribute on the renderer.

 

column

The column position on the model to get the attribute from.

 

Since: 2.4


gtk_cell_layout_set_cell_data_func ()

void
gtk_cell_layout_set_cell_data_func (GtkCellLayout *cell_layout,
                                    GtkCellRenderer *cell,
                                    GtkCellLayoutDataFunc func,
                                    gpointer func_data,
                                    GDestroyNotify destroy);

Sets the GtkCellLayoutDataFunc to use for cell_layout . This function is used instead of the standard attributes mapping for setting the column value, and should set the value of cell_layout 's cell renderer(s) as appropriate. func may be NULL to remove and older one.

Parameters

cell_layout

A GtkCellLayout.

 

cell

A GtkCellRenderer.

 

func

The GtkCellLayoutDataFunc to use.

 

func_data

The user data for func .

 

destroy

The destroy notification for func_data .

 

Since: 2.4


gtk_cell_layout_clear_attributes ()

void
gtk_cell_layout_clear_attributes (GtkCellLayout *cell_layout,
                                  GtkCellRenderer *cell);

Clears all existing attributes previously set with gtk_cell_layout_set_attributes().

Parameters

cell_layout

A GtkCellLayout.

 

cell

A GtkCellRenderer to clear the attribute mapping on.

 

Since: 2.4

Types and Values

GtkCellLayout

typedef struct _GtkCellLayout GtkCellLayout;


struct GtkCellLayoutIface

struct GtkCellLayoutIface {
  GTypeInterface g_iface;

  /* Virtual Table */
  void (* pack_start)         (GtkCellLayout         *cell_layout,
                               GtkCellRenderer       *cell,
                               gboolean               expand);
  void (* pack_end)           (GtkCellLayout         *cell_layout,
                               GtkCellRenderer       *cell,
                               gboolean               expand);
  void (* clear)              (GtkCellLayout         *cell_layout);
  void (* add_attribute)      (GtkCellLayout         *cell_layout,
                               GtkCellRenderer       *cell,
                               const gchar           *attribute,
                               gint                   column);
  void (* set_cell_data_func) (GtkCellLayout         *cell_layout,
                               GtkCellRenderer       *cell,
                               GtkCellLayoutDataFunc  func,
                               gpointer               func_data,
                               GDestroyNotify         destroy);
  void (* clear_attributes)   (GtkCellLayout         *cell_layout,
                               GtkCellRenderer       *cell);
  void (* reorder)            (GtkCellLayout         *cell_layout,
                               GtkCellRenderer       *cell,
                               gint                   position);
  GList* (* get_cells)        (GtkCellLayout         *cell_layout);
};

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