#[repr(transparent)]pub struct CellArea { /* private fields */ }
Expand description
The CellArea
is an abstract class for CellLayout
widgets
(also referred to as “layouting widgets”) to interface with an
arbitrary number of GtkCellRenderers
and interact with the user
for a given 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 CellArea
directly
unless they are implementing a cell-layouting widget themselves.
Requesting area sizes
As outlined in
[GtkWidget’s geometry management section][geometry-management],
GTK+ uses a height-for-width
geometry management system to compute the sizes of widgets and user
interfaces. CellArea
uses the same semantics to calculate the
size of an area for an arbitrary number of 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 TreeViewColumn
always lines up the areas from top to bottom while a 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 CellArea
uses a 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 CellAreaContext
is an opaque object specific to the
CellArea
which created it (see CellAreaExt::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 CellAreaContext
which
was used to request the sizes for a given 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 TreeModel
one would do the following:
⚠️ The following code is in C ⚠️
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 CellAreaContext
object and can be consulted
at any time.
This can be useful since CellLayout
widgets usually have to
support requesting and rendering rows in treemodels with an
exceedingly large amount of rows. The CellLayout
widget in
that case would calculate the required width of the rows in an
idle or timeout source (see g_timeout_add()
) and when the widget
is requested its actual width in GtkWidgetClass.get_preferred_width()
it can simply consult the width accumulated so far in the
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:
⚠️ The following code is in C ⚠️
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 CellAreaContext
.
Requesting the height for width (or width for height) of an area is
a similar task except in this case the 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 CellArea
).
In order to request the height for width of all the rows at the
root level of a TreeModel
one would do the following:
⚠️ The following code is in C ⚠️
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 GtkWidgetClass.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
GtkWidgetClass.draw()
time.
A crude example of how to render all the rows at the root level runs as follows:
⚠️ The following code is in C ⚠️
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
signal::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 CellAreaExt::event()
API as they come in. Usually 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 signal::CellArea::focus-changed
signal to fire; as well as
signal::CellArea::add-editable
in the case that an editable cell was
clicked and needs to start editing. You can call
CellAreaExt::stop_editing()
at any time to cancel any cell editing
that is currently in progress.
The CellArea
drives keyboard focus from cell to cell in a way
similar to Widget
. For layouting widgets that support giving
focus to cells it’s important to remember to pass 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
GtkWidgetClass.focus()
virtual method. The layouting widget is always
responsible for knowing where TreeModel
rows are rendered inside
the widget, so at GtkWidgetClass.focus()
time the layouting widget
should use the CellArea
methods to navigate focus inside the area
and then observe the GtkDirectionType to pass the focus to adjacent
rows and areas.
A basic example of how the GtkWidgetClass.focus()
virtual method
should be implemented:
⚠️ The following code is in C ⚠️
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 GtkDirectionType values to the way it lays out its cells.
Cell Properties
The CellArea
introduces cell properties for GtkCellRenderers
in very much the same way that Container
introduces
[child properties][child-properties]
for GtkWidgets
. This provides some general interfaces for defining
the relationship cell areas have with their cells. For instance in a
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 CellAreaContext
.
Use gtk_cell_area_class_install_cell_property()
to install cell
properties for a cell area class and gtk_cell_area_class_find_cell_property()
or gtk_cell_area_class_list_cell_properties()
to get information about
existing cell properties.
To set the value of a cell property, use CellAreaExt::cell_set_property()
,
gtk_cell_area_cell_set()
or gtk_cell_area_cell_set_valist()
. To obtain
the value of a cell property, use CellAreaExt::cell_get_property()
,
gtk_cell_area_cell_get()
or gtk_cell_area_cell_get_valist()
.
This is an Abstract Base Class, you cannot instantiate it.
Implements
CellAreaExt
, glib::ObjectExt
, BuildableExt
, CellLayoutExt
, BuildableExtManual
Implementations
Trait Implementations
sourceimpl Ord for CellArea
impl Ord for CellArea
1.21.0 · sourceconst fn max(self, other: Self) -> Self
const fn max(self, other: Self) -> Self
1.21.0 · sourceconst fn min(self, other: Self) -> Self
const fn min(self, other: Self) -> Self
1.50.0 · sourceconst fn clamp(self, min: Self, max: Self) -> Selfwhere
Self: PartialOrd<Self>,
const fn clamp(self, min: Self, max: Self) -> Selfwhere
Self: PartialOrd<Self>,
sourceimpl ParentClassIs for CellArea
impl ParentClassIs for CellArea
sourceimpl<OT: ObjectType> PartialOrd<OT> for CellArea
impl<OT: ObjectType> PartialOrd<OT> for CellArea
sourcefn partial_cmp(&self, other: &OT) -> Option<Ordering>
fn partial_cmp(&self, other: &OT) -> Option<Ordering>
1.0.0 · sourceconst fn le(&self, other: &Rhs) -> bool
const fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresourceimpl StaticType for CellArea
impl StaticType for CellArea
sourcefn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for CellArea
impl IsA<Buildable> for CellArea
impl IsA<CellArea> for CellAreaBox
impl IsA<CellLayout> for CellArea
Auto Trait Implementations
impl RefUnwindSafe for CellArea
impl !Send for CellArea
impl !Sync for CellArea
impl Unpin for CellArea
impl UnwindSafe for CellArea
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
sourceimpl<T> Cast for Twhere
T: ObjectType,
impl<T> Cast for Twhere
T: ObjectType,
sourcefn upcast<T>(self) -> Twhere
T: ObjectType,
Self: IsA<T>,
fn upcast<T>(self) -> Twhere
T: ObjectType,
Self: IsA<T>,
T
. Read moresourcefn upcast_ref<T>(&self) -> &Twhere
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Self: IsA<T>,
fn upcast_ref<T>(&self) -> &Twhere
T: ObjectType,
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. Read moresourcefn downcast<T>(self) -> Result<T, Self>where
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impl<U> IsSubclassableExt for Uwhere
U: IsClass + ParentClassIs,
fn parent_class_init<T>(class: &mut Class<U>)where
T: ObjectSubclass,
<U as ParentClassIs>::Parent: IsSubclassable<T>,
fn parent_instance_init<T>(instance: &mut InitializingObject<T>)where
T: ObjectSubclass,
<U as ParentClassIs>::Parent: IsSubclassable<T>,
sourceimpl<T> ObjectExt for Twhere
T: ObjectType,
impl<T> ObjectExt for Twhere
T: ObjectType,
sourcefn is<U>(&self) -> boolwhere
U: StaticType,
fn is<U>(&self) -> boolwhere
U: StaticType,
true
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sourcefn set_property_from_value(&self, property_name: &str, value: &Value)
fn set_property_from_value(&self, property_name: &str, value: &Value)
sourcefn set_properties(&self, property_values: &[(&str, &dyn ToValue)])
fn set_properties(&self, property_values: &[(&str, &dyn ToValue)])
sourcefn set_properties_from_value(&self, property_values: &[(&str, Value)])
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V: 'static + for<'b> FromValue<'b>,
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V: 'static + for<'b> FromValue<'b>,
property_name
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ParamSpec
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fn list_properties(&self) -> PtrSlice<ParamSpec>
ParamSpec
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fn freeze_notify(&self) -> PropertyNotificationFreezeGuard
sourceunsafe fn set_qdata<QD>(&self, key: Quark, value: QD)where
QD: 'static,
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QD: 'static,
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QD: 'static,
key
. Read moresourceunsafe fn steal_qdata<QD>(&self, key: Quark) -> Option<QD>where
QD: 'static,
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QD: 'static,
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. Read moresourceunsafe fn set_data<QD>(&self, key: &str, value: QD)where
QD: 'static,
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QD: 'static,
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. Read moresourceunsafe fn steal_data<QD>(&self, key: &str) -> Option<QD>where
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. Read moresourcefn block_signal(&self, handler_id: &SignalHandlerId)
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sourcefn unblock_signal(&self, handler_id: &SignalHandlerId)
fn unblock_signal(&self, handler_id: &SignalHandlerId)
sourcefn stop_signal_emission(&self, signal_id: SignalId, detail: Option<Quark>)
fn stop_signal_emission(&self, signal_id: SignalId, detail: Option<Quark>)
sourcefn stop_signal_emission_by_name(&self, signal_name: &str)
fn stop_signal_emission_by_name(&self, signal_name: &str)
sourcefn connect<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: 'static + Fn(&[Value]) -> Option<Value> + Send + Sync,
fn connect<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: 'static + Fn(&[Value]) -> Option<Value> + Send + Sync,
signal_name
on this object. Read moresourcefn connect_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: 'static + Fn(&[Value]) -> Option<Value> + Send + Sync,
fn connect_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: 'static + Fn(&[Value]) -> Option<Value> + Send + Sync,
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&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerIdwhere
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fn connect_local<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: 'static + Fn(&[Value]) -> Option<Value>,
signal_name
on this object. Read moresourcefn connect_local_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: 'static + Fn(&[Value]) -> Option<Value>,
fn connect_local_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: 'static + Fn(&[Value]) -> Option<Value>,
signal_id
on this object. Read moresourceunsafe fn connect_unsafe<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value>,
unsafe fn connect_unsafe<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value>,
signal_name
on this object. Read moresourceunsafe fn connect_unsafe_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value>,
unsafe fn connect_unsafe_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value>,
signal_id
on this object. Read moresourcefn connect_closure(
&self,
signal_name: &str,
after: bool,
closure: RustClosure
) -> SignalHandlerId
fn connect_closure(
&self,
signal_name: &str,
after: bool,
closure: RustClosure
) -> SignalHandlerId
signal_name
on this object. Read moresourcefn connect_closure_id(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
closure: RustClosure
) -> SignalHandlerId
fn connect_closure_id(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
closure: RustClosure
) -> SignalHandlerId
signal_id
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fn watch_closure(&self, closure: &impl AsRef<Closure>)
closure
to the lifetime of the object. When
the object’s reference count drops to zero, the closure will be
invalidated. An invalidated closure will ignore any calls to
invoke_with_values
, or
invoke
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R: TryFromClosureReturnValue,
fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
sourcefn emit_with_values(&self, signal_id: SignalId, args: &[Value]) -> Option<Value>
fn emit_with_values(&self, signal_id: SignalId, args: &[Value]) -> Option<Value>
Self::emit
but takes Value
for the arguments.sourcefn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
sourcefn emit_by_name_with_values(
&self,
signal_name: &str,
args: &[Value]
) -> Option<Value>
fn emit_by_name_with_values(
&self,
signal_name: &str,
args: &[Value]
) -> Option<Value>
sourcefn emit_by_name_with_details<R>(
&self,
signal_name: &str,
details: Quark,
args: &[&dyn ToValue]
) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_by_name_with_details<R>(
&self,
signal_name: &str,
details: Quark,
args: &[&dyn ToValue]
) -> Rwhere
R: TryFromClosureReturnValue,
sourcefn emit_by_name_with_details_and_values(
&self,
signal_name: &str,
details: Quark,
args: &[Value]
) -> Option<Value>
fn emit_by_name_with_details_and_values(
&self,
signal_name: &str,
details: Quark,
args: &[Value]
) -> Option<Value>
sourcefn emit_with_details<R>(
&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue]
) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_with_details<R>(
&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue]
) -> Rwhere
R: TryFromClosureReturnValue,
sourcefn emit_with_details_and_values(
&self,
signal_id: SignalId,
details: Quark,
args: &[Value]
) -> Option<Value>
fn emit_with_details_and_values(
&self,
signal_id: SignalId,
details: Quark,
args: &[Value]
) -> Option<Value>
sourcefn disconnect(&self, handler_id: SignalHandlerId)
fn disconnect(&self, handler_id: SignalHandlerId)
sourcefn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere
F: 'static + Fn(&T, &ParamSpec) + Send + Sync,
fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere
F: 'static + Fn(&T, &ParamSpec) + Send + Sync,
notify
signal of the object. Read moresourcefn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere
F: 'static + Fn(&T, &ParamSpec),
fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere
F: 'static + Fn(&T, &ParamSpec),
notify
signal of the object. Read moresourceunsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F
) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec),
unsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F
) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec),
notify
signal of the object. Read more