pub struct CellLayout { /* private fields */ }
Expand description
List views use widgets to display their contents.
See LayoutManager
for layout manager delegate objects
An interface for packing cells
CellLayout
is an interface to be implemented by all objects which
want to provide a TreeViewColumn
like API for packing cells,
setting attributes and data funcs.
One of the notable features provided by implementations of
CellLayout
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 (CellView
, IconView
, ComboBox
,
EntryCompletion
, TreeViewColumn
) accept CellRenderer
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.
This is an example of a UI definition fragment specifying attributes:
<object class="GtkCellView">
<child>
<object class="GtkCellRendererText"/>
<attributes>
<attribute name="text">0</attribute>
</attributes>
</child>
</object>
Furthermore for implementations of CellLayout
that use a CellArea
to lay out cells (all CellLayout
s in GTK use a CellArea
)
cell properties can also be defined
in the format by specifying the custom <cell-packing>
attribute which can
contain multiple <property>
elements.
Here is a UI definition fragment specifying cell properties:
<object class="GtkTreeViewColumn">
<child>
<object class="GtkCellRendererText"/>
<cell-packing>
<property name="align">True</property>
<property name="expand">False</property>
</cell-packing>
</child>
</object>
§Subclassing GtkCellLayout implementations
When subclassing a widget that implements CellLayout
like
IconView
or ComboBox
, there are some considerations related
to the fact that these widgets internally use a CellArea
.
The cell area is exposed as a construct-only property by these
widgets. This means that it is possible to e.g. do
⚠️ The following code is in c ⚠️
GtkWIdget *combo =
g_object_new (GTK_TYPE_COMBO_BOX, "cell-area", my_cell_area, NULL);
to use a custom cell area with a combo box. But construct properties
are only initialized after instance init()
functions have run, which means that using functions which rely on
the existence of the cell area in your subclass init()
function will
cause the default cell area to be instantiated. In this case, a provided
construct property value will be ignored (with a warning, to alert
you to the problem).
⚠️ The following code is in c ⚠️
static void
my_combo_box_init (MyComboBox *b)
{
GtkCellRenderer *cell;
cell = gtk_cell_renderer_pixbuf_new ();
// The following call causes the default cell area for combo boxes,
// a GtkCellAreaBox, to be instantiated
gtk_cell_layout_pack_start (GTK_CELL_LAYOUT (b), cell, FALSE);
...
}
GtkWidget *
my_combo_box_new (GtkCellArea *area)
{
// This call is going to cause a warning about area being ignored
return g_object_new (MY_TYPE_COMBO_BOX, "cell-area", area, NULL);
}
If supporting alternative cell areas with your derived widget is
not important, then this does not have to concern you. If you want
to support alternative cell areas, you can do so by moving the
problematic calls out of init()
and into a constructor()
for your class.
§Implements
CellLayoutExt
, CellLayoutExtManual
GLib type: GObject with reference counted clone semantics.
Implementations§
source§impl CellLayout
impl CellLayout
pub const NONE: Option<&'static CellLayout> = None
Trait Implementations§
source§impl Clone for CellLayout
impl Clone for CellLayout
source§impl Debug for CellLayout
impl Debug for CellLayout
source§impl HasParamSpec for CellLayout
impl HasParamSpec for CellLayout
type ParamSpec = ParamSpecObject
source§type SetValue = CellLayout
type SetValue = CellLayout
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, CellLayout>
fn param_spec_builder() -> Self::BuilderFn
source§impl Hash for CellLayout
impl Hash for CellLayout
source§impl<T: CellLayoutImpl> IsImplementable<T> for CellLayout
impl<T: CellLayoutImpl> IsImplementable<T> for CellLayout
source§fn interface_init(iface: &mut Interface<Self>)
fn interface_init(iface: &mut Interface<Self>)
source§fn instance_init(_instance: &mut InitializingObject<T>)
fn instance_init(_instance: &mut InitializingObject<T>)
source§impl Ord for CellLayout
impl Ord for CellLayout
source§fn cmp(&self, other: &Self) -> Ordering
fn cmp(&self, other: &Self) -> Ordering
Comparison for two GObjects.
Compares the memory addresses of the provided objects.
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl<OT: ObjectType> PartialEq<OT> for CellLayout
impl<OT: ObjectType> PartialEq<OT> for CellLayout
source§impl<OT: ObjectType> PartialOrd<OT> for CellLayout
impl<OT: ObjectType> PartialOrd<OT> for CellLayout
source§impl StaticType for CellLayout
impl StaticType for CellLayout
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for CellLayout
impl IsA<CellLayout> for CellArea
impl IsA<CellLayout> for CellAreaBox
impl IsA<CellLayout> for CellView
impl IsA<CellLayout> for ComboBox
impl IsA<CellLayout> for ComboBoxText
impl IsA<CellLayout> for EntryCompletion
impl IsA<CellLayout> for IconView
impl IsA<CellLayout> for TreeViewColumn
Auto Trait Implementations§
impl Freeze for CellLayout
impl RefUnwindSafe for CellLayout
impl !Send for CellLayout
impl !Sync for CellLayout
impl Unpin for CellLayout
impl UnwindSafe for CellLayout
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T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
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unconditionally. Read moresource§impl<O> CellLayoutExt for Owhere
O: IsA<CellLayout>,
impl<O> CellLayoutExt for Owhere
O: IsA<CellLayout>,
source§fn add_attribute(
&self,
cell: &impl IsA<CellRenderer>,
attribute: &str,
column: i32,
)
fn add_attribute( &self, cell: &impl IsA<CellRenderer>, attribute: &str, column: i32, )
source§fn clear(&self)
fn clear(&self)
source§fn clear_attributes(&self, cell: &impl IsA<CellRenderer>)
fn clear_attributes(&self, cell: &impl IsA<CellRenderer>)
source§fn cells(&self) -> Vec<CellRenderer>
fn cells(&self) -> Vec<CellRenderer>
source§fn pack_start(&self, cell: &impl IsA<CellRenderer>, expand: bool)
fn pack_start(&self, cell: &impl IsA<CellRenderer>, expand: bool)
source§fn reorder(&self, cell: &impl IsA<CellRenderer>, position: i32)
fn reorder(&self, cell: &impl IsA<CellRenderer>, position: i32)
source§fn set_cell_data_func<P: Fn(&CellLayout, &CellRenderer, &TreeModel, &TreeIter) + 'static>(
&self,
cell: &impl IsA<CellRenderer>,
func: P,
)
fn set_cell_data_func<P: Fn(&CellLayout, &CellRenderer, &TreeModel, &TreeIter) + 'static>( &self, cell: &impl IsA<CellRenderer>, func: P, )
CellLayout
DataFunc to use for @self. Read moresource§impl<O> CellLayoutExtManual for Owhere
O: IsA<CellLayout>,
impl<O> CellLayoutExtManual for Owhere
O: IsA<CellLayout>,
source§fn set_attributes(
&self,
cell: &impl IsA<CellRenderer>,
attributes: &[(&str, i32)],
)
fn set_attributes( &self, cell: &impl IsA<CellRenderer>, attributes: &[(&str, i32)], )
source§fn unset_cell_data_func(&self, cell: &impl IsA<CellRenderer>)
fn unset_cell_data_func(&self, cell: &impl IsA<CellRenderer>)
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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
when using Rust closures.source§fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
source§fn 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.source§fn 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,
source§fn 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>
source§fn 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,
source§fn 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>
source§fn 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,
source§fn 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>
source§fn disconnect(&self, handler_id: SignalHandlerId)
fn disconnect(&self, handler_id: SignalHandlerId)
source§fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
notify
signal of the object. Read moresource§fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
notify
signal of the object. Read moresource§unsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F,
) -> SignalHandlerId
unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F, ) -> SignalHandlerId
notify
signal of the object. Read more