Functions
gtk_cell_area_context_get_area ()
GtkCellArea *
gtk_cell_area_context_get_area (GtkCellAreaContext *context);
Fetches the GtkCellArea this context
was created by.
This is generally unneeded by layouting widgets; however,
it is important for the context implementation itself to
fetch information about the area it is being used for.
For instance at GtkCellAreaContextClass.allocate() time
it’s important to know details about any cell spacing
that the GtkCellArea is configured with in order to
compute a proper allocation.
Returns
the GtkCellArea this context was created by.
[transfer none]
Since: 3.0
gtk_cell_area_context_allocate ()
void
gtk_cell_area_context_allocate (GtkCellAreaContext *context,
gint width,
gint height);
Allocates a width and/or a height for all rows which are to be
rendered with context
.
Usually allocation is performed only horizontally or sometimes
vertically since a group of rows are usually rendered side by
side vertically or horizontally and share either the same width
or the same height. Sometimes they are allocated in both horizontal
and vertical orientations producing a homogeneous effect of the
rows. This is generally the case for GtkTreeView when
“fixed-height-mode” is enabled.
Since 3.0
gtk_cell_area_context_reset ()
void
gtk_cell_area_context_reset (GtkCellAreaContext *context);
Resets any previously cached request and allocation
data.
When underlying GtkTreeModel data changes its
important to reset the context if the content
size is allowed to shrink. If the content size
is only allowed to grow (this is usually an option
for views rendering large data stores as a measure
of optimization), then only the row that changed
or was inserted needs to be (re)requested with
gtk_cell_area_get_preferred_width().
When the new overall size of the context requires
that the allocated size changes (or whenever this
allocation changes at all), the variable row
sizes need to be re-requested for every row.
For instance, if the rows are displayed all with
the same width from top to bottom then a change
in the allocated width necessitates a recalculation
of all the displayed row heights using
gtk_cell_area_get_preferred_height_for_width().
Since 3.0
gtk_cell_area_context_get_preferred_width ()
void
gtk_cell_area_context_get_preferred_width
(GtkCellAreaContext *context,
gint *minimum_width,
gint *natural_width);
Gets the accumulative preferred width for all rows which have been
requested with this context.
After gtk_cell_area_context_reset() is called and/or before ever
requesting the size of a GtkCellArea, the returned values are 0.
Since: 3.0
gtk_cell_area_context_get_preferred_height ()
void
gtk_cell_area_context_get_preferred_height
(GtkCellAreaContext *context,
gint *minimum_height,
gint *natural_height);
Gets the accumulative preferred height for all rows which have been
requested with this context.
After gtk_cell_area_context_reset() is called and/or before ever
requesting the size of a GtkCellArea, the returned values are 0.
Since: 3.0
gtk_cell_area_context_get_preferred_height_for_width ()
void
gtk_cell_area_context_get_preferred_height_for_width
(GtkCellAreaContext *context,
gint width,
gint *minimum_height,
gint *natural_height);
Gets the accumulative preferred height for width
for all rows
which have been requested for the same said width
with this context.
After gtk_cell_area_context_reset() is called and/or before ever
requesting the size of a GtkCellArea, the returned values are -1.
Since: 3.0
gtk_cell_area_context_get_preferred_width_for_height ()
void
gtk_cell_area_context_get_preferred_width_for_height
(GtkCellAreaContext *context,
gint height,
gint *minimum_width,
gint *natural_width);
Gets the accumulative preferred width for height
for all rows which
have been requested for the same said height
with this context.
After gtk_cell_area_context_reset() is called and/or before ever
requesting the size of a GtkCellArea, the returned values are -1.
Since: 3.0
gtk_cell_area_context_get_allocation ()
void
gtk_cell_area_context_get_allocation (GtkCellAreaContext *context,
gint *width,
gint *height);
Fetches the current allocation size for context
.
If the context was not allocated in width or height, or if the
context was recently reset with gtk_cell_area_context_reset(),
the returned value will be -1.
Since: 3.0
gtk_cell_area_context_push_preferred_width ()
void
gtk_cell_area_context_push_preferred_width
(GtkCellAreaContext *context,
gint minimum_width,
gint natural_width);
Causes the minimum and/or natural width to grow if the new
proposed sizes exceed the current minimum and natural width.
This is used by GtkCellAreaContext implementations during
the request process over a series of GtkTreeModel rows to
progressively push the requested width over a series of
gtk_cell_area_get_preferred_width() requests.
Since: 3.0
gtk_cell_area_context_push_preferred_height ()
void
gtk_cell_area_context_push_preferred_height
(GtkCellAreaContext *context,
gint minimum_height,
gint natural_height);
Causes the minimum and/or natural height to grow if the new
proposed sizes exceed the current minimum and natural height.
This is used by GtkCellAreaContext implementations during
the request process over a series of GtkTreeModel rows to
progressively push the requested height over a series of
gtk_cell_area_get_preferred_height() requests.
Since: 3.0
Property Details
The “area” property
“area” GtkCellArea *
The GtkCellArea this context was created by
Owner: GtkCellAreaContext
Flags: Read / Write / Construct Only
Since: 3.0