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GTK+ Reference Manual | |
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GtkCellRendererGtkCellRenderer — An object for rendering a single cell on a GdkDrawable |
#include <gtk/gtk.h> enum GtkCellRendererState; enum GtkCellRendererMode; GtkCellRenderer; void gtk_cell_renderer_get_size (GtkCellRenderer *cell, GtkWidget *widget, GdkRectangle *cell_area, gint *x_offset, gint *y_offset, gint *width, gint *height); void gtk_cell_renderer_render (GtkCellRenderer *cell, GdkWindow *window, GtkWidget *widget, GdkRectangle *background_area, GdkRectangle *cell_area, GdkRectangle *expose_area, GtkCellRendererState flags); gboolean gtk_cell_renderer_activate (GtkCellRenderer *cell, GdkEvent *event, GtkWidget *widget, const gchar *path, GdkRectangle *background_area, GdkRectangle *cell_area, GtkCellRendererState flags); GtkCellEditable* gtk_cell_renderer_start_editing (GtkCellRenderer *cell, GdkEvent *event, GtkWidget *widget, const gchar *path, GdkRectangle *background_area, GdkRectangle *cell_area, GtkCellRendererState flags); void gtk_cell_renderer_editing_canceled (GtkCellRenderer *cell); void gtk_cell_renderer_stop_editing (GtkCellRenderer *cell, gboolean canceled); void gtk_cell_renderer_get_fixed_size (GtkCellRenderer *cell, gint *width, gint *height); void gtk_cell_renderer_set_fixed_size (GtkCellRenderer *cell, gint width, gint height);
GObject
+----GInitiallyUnowned
+----GtkObject
+----GtkCellRenderer
+----GtkCellRendererText
+----GtkCellRendererPixbuf
+----GtkCellRendererProgress
+----GtkCellRendererToggle
"cell-background" gchararray : Write "cell-background-gdk" GdkColor : Read / Write "cell-background-set" gboolean : Read / Write "height" gint : Read / Write "is-expanded" gboolean : Read / Write "is-expander" gboolean : Read / Write "mode" GtkCellRendererMode : Read / Write "sensitive" gboolean : Read / Write "visible" gboolean : Read / Write "width" gint : Read / Write "xalign" gfloat : Read / Write "xpad" guint : Read / Write "yalign" gfloat : Read / Write "ypad" guint : Read / Write
The GtkCellRenderer is a base class of a set of objects used for rendering a cell to a GdkDrawable. 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 GdkDrawable. 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 formost, 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 GtkEntry.
To make a cell renderer activatable or editable, you have to
implement the activate or start_editing virtual functions,
respectively.
typedef enum
{
GTK_CELL_RENDERER_SELECTED = 1 << 0,
GTK_CELL_RENDERER_PRELIT = 1 << 1,
GTK_CELL_RENDERER_INSENSITIVE = 1 << 2,
/* this flag means the cell is in the sort column/row */
GTK_CELL_RENDERER_SORTED = 1 << 3,
GTK_CELL_RENDERER_FOCUSED = 1 << 4
} GtkCellRendererState;
Tells how a cell is to be rendererd.
typedef enum
{
GTK_CELL_RENDERER_MODE_INERT,
GTK_CELL_RENDERER_MODE_ACTIVATABLE,
GTK_CELL_RENDERER_MODE_EDITABLE
} GtkCellRendererMode;
Identifies how the user can interact with a particular cell.
void gtk_cell_renderer_get_size (GtkCellRenderer *cell, GtkWidget *widget, GdkRectangle *cell_area, gint *x_offset, gint *y_offset, gint *width, gint *height);
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.
cell : |
a GtkCellRenderer |
widget : |
the widget the renderer is rendering to |
cell_area : |
The area a cell will be allocated, or NULL
|
x_offset : |
location to return x offset of cell relative to cell_area, or NULL
|
y_offset : |
location to return y offset of cell relative to cell_area, or NULL
|
width : |
location to return width needed to render a cell, or NULL
|
height : |
location to return height needed to render a cell, or NULL
|
void gtk_cell_renderer_render (GtkCellRenderer *cell, GdkWindow *window, GtkWidget *widget, GdkRectangle *background_area, GdkRectangle *cell_area, GdkRectangle *expose_area, GtkCellRendererState flags);
Invokes the virtual render function of the GtkCellRenderer. The three
passed-in rectangles are areas of window. 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. expose_area is a clip rectangle.
cell : |
a GtkCellRenderer |
window : |
a GdkDrawable 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 |
expose_area : |
area that actually needs updating |
flags : |
flags that affect rendering |
gboolean gtk_cell_renderer_activate (GtkCellRenderer *cell, GdkEvent *event, GtkWidget *widget, const gchar *path, GdkRectangle *background_area, 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.
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
|
GtkCellEditable* gtk_cell_renderer_start_editing (GtkCellRenderer *cell, GdkEvent *event, GtkWidget *widget, const gchar *path, GdkRectangle *background_area, GdkRectangle *cell_area, GtkCellRendererState flags);
Passes an activate event to the cell renderer for possible processing.
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 : | A new GtkCellEditable, or NULL
|
void gtk_cell_renderer_editing_canceled (GtkCellRenderer *cell);
gtk_cell_renderer_editing_canceled has been deprecated since version 2.6 and should not be used in newly-written code. Use gtk_cell_renderer_stop_editing() instead
Causes the cell renderer to emit the "editing-canceled" signal. This function is for use only by implementations of cell renderers that need to notify the client program that an editing process was canceled and the changes were not committed.
cell : |
A GtkCellRenderer |
Since 2.4
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.
cell : |
A GtkCellRenderer |
canceled : |
TRUE if the editing has been canceled
|
Since 2.6
void gtk_cell_renderer_get_fixed_size (GtkCellRenderer *cell, gint *width, gint *height);
Fills in width and height with the appropriate size of cell.
cell : |
A GtkCellRenderer |
width : |
location to fill in with the fixed width of the widget, or NULL
|
height : |
location to fill in with the fixed height of the widget, or NULL
|
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.
cell : |
A GtkCellRenderer |
width : |
the width of the cell renderer, or -1 |
height : |
the height of the cell renderer, or -1 |
cell-background" property"cell-background" gchararray : Write
Cell background color as a string.
Default value: NULL
cell-background-gdk" property"cell-background-gdk" GdkColor : Read / Write
Cell background color as a GdkColor.
cell-background-set" property"cell-background-set" gboolean : Read / Write
Whether this tag affects the cell background color.
Default value: FALSE
height" property"height" gint : Read / Write
The fixed height.
Allowed values: >= -1
Default value: -1
is-expanded" property"is-expanded" gboolean : Read / Write
Row is an expander row, and is expanded.
Default value: FALSE
is-expander" property"is-expander" gboolean : Read / Write
Row has children.
Default value: FALSE
mode" property"mode" GtkCellRendererMode : Read / Write
Editable mode of the CellRenderer.
Default value: GTK_CELL_RENDERER_MODE_INERT
sensitive" property"sensitive" gboolean : Read / Write
Display the cell sensitive.
Default value: TRUE
width" property"width" gint : Read / Write
The fixed width.
Allowed values: >= -1
Default value: -1
xalign" property"xalign" gfloat : Read / Write
The x-align.
Allowed values: [0,1]
Default value: 0.5
yalign" property"yalign" gfloat : Read / Write
The y-align.
Allowed values: [0,1]
Default value: 0.5
void user_function (GtkCellRenderer *renderer, gpointer user_data) : Run First
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.
See also: gtk_cell_renderer_editing_canceled()
renderer : |
the object which received the signal |
user_data : |
user data set when the signal handler was connected. |
Since 2.4
void user_function (GtkCellRenderer *renderer, GtkCellEditable *editable, gchar *path, gpointer user_data) : Run First
This signal gets emitted when a cell starts to be edited.
The indended use of this signal is to do special setup
on editable, e.g. adding a GtkEntryCompletion or setting
up additional columns in a GtkComboBox.
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);
}
}
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. |
Since 2.6