Struct gtk4::TreeExpander
source · #[repr(transparent)]pub struct TreeExpander { /* private fields */ }
Expand description
TreeExpander
is a widget that provides an expander for a list.
It is typically placed as a bottommost child into a ListView
to allow users to expand and collapse children in a list with a
TreeListModel
. TreeExpander
provides the common UI
elements, gestures and keybindings for this purpose.
On top of this, the “listitem.expand”, “listitem.collapse” and “listitem.toggle-expand” actions are provided to allow adding custom UI for managing expanded state.
The TreeListModel
must be set to not be passthrough. Then it
will provide TreeListRow
items which can be set via
set_list_row()
on the expander.
The expander will then watch that row item automatically.
set_child()
sets the widget that displays
the actual row contents.
TreeExpander
can be modified with properties such as
indent-for-icon
,
indent-for-depth
, and
hide-expander
to achieve a different appearance.
This can even be done to influence individual rows, for example by binding
the hide-expander
property to the item count of
the model of the treelistrow, to hide the expander for rows without children,
even if the row is expandable.
CSS nodes
treeexpander
├── [indent]*
├── [expander]
╰── <child>
TreeExpander
has zero or one CSS nodes with the name “expander” that
should display the expander icon. The node will be :checked
when it
is expanded. If the node is not expandable, an “indent” node will be
displayed instead.
For every level of depth, another “indent” node is prepended.
Accessibility
TreeExpander
uses the AccessibleRole::Group
role. The expander icon
is represented as a AccessibleRole::Button
, labelled by the expander’s
child, and toggling it will change the AccessibleState::Expanded
state.
Properties
child
The child widget with the actual contents.
Readable | Writeable
hide-expander
Whether the expander icon should be hidden in a GtkTreeListRow. Note that this property simply hides the icon. The actions and keybinding (i.e. collapse and expand) are not affected by this property.
A common use for this property would be to bind to the number of children in a GtkTreeListRow’s model in order to hide the expander when a row has no children.
Readable | Writeable
indent-for-depth
TreeExpander indents the child according to its depth.
Readable | Writeable
indent-for-icon
TreeExpander indents the child by the width of an expander-icon if it is not expandable.
Readable | Writeable
item
The item held by this expander’s row.
Readable
list-row
The list row to track for expander state.
Readable | Writeable
Widget
can-focus
Whether the widget or any of its descendents can accept the input focus.
This property is meant to be set by widget implementations, typically in their instance init function.
Readable | Writeable
can-target
Whether the widget can receive pointer events.
Readable | Writeable
css-classes
A list of css classes applied to this widget.
Readable | Writeable
css-name
The name of this widget in the CSS tree.
This property is meant to be set by widget implementations, typically in their instance init function.
Readable | Writeable | Construct Only
cursor
The cursor used by @widget.
Readable | Writeable
focus-on-click
Whether the widget should grab focus when it is clicked with the mouse.
This property is only relevant for widgets that can take focus.
Readable | Writeable
focusable
Whether this widget itself will accept the input focus.
Readable | Writeable
halign
How to distribute horizontal space if widget gets extra space.
Readable | Writeable
has-default
Whether the widget is the default widget.
Readable
has-focus
Whether the widget has the input focus.
Readable
has-tooltip
Enables or disables the emission of the ::query-tooltip signal on @widget.
A value of true
indicates that @widget can have a tooltip, in this case
the widget will be queried using query-tooltip
to
determine whether it will provide a tooltip or not.
Readable | Writeable
height-request
Override for height request of the widget.
If this is -1, the natural request will be used.
Readable | Writeable
hexpand
Whether to expand horizontally.
Readable | Writeable
hexpand-set
Whether to use the hexpand
property.
Readable | Writeable
layout-manager
The LayoutManager
instance to use to compute the preferred size
of the widget, and allocate its children.
This property is meant to be set by widget implementations, typically in their instance init function.
Readable | Writeable
margin-bottom
Margin on bottom side of widget.
This property adds margin outside of the widget’s normal size
request, the margin will be added in addition to the size from
WidgetExt::set_size_request()
for example.
Readable | Writeable
margin-end
Margin on end of widget, horizontally.
This property supports left-to-right and right-to-left text directions.
This property adds margin outside of the widget’s normal size
request, the margin will be added in addition to the size from
WidgetExt::set_size_request()
for example.
Readable | Writeable
margin-start
Margin on start of widget, horizontally.
This property supports left-to-right and right-to-left text directions.
This property adds margin outside of the widget’s normal size
request, the margin will be added in addition to the size from
WidgetExt::set_size_request()
for example.
Readable | Writeable
margin-top
Margin on top side of widget.
This property adds margin outside of the widget’s normal size
request, the margin will be added in addition to the size from
WidgetExt::set_size_request()
for example.
Readable | Writeable
name
The name of the widget.
Readable | Writeable
opacity
The requested opacity of the widget.
Readable | Writeable
overflow
How content outside the widget’s content area is treated.
This property is meant to be set by widget implementations, typically in their instance init function.
Readable | Writeable
parent
The parent widget of this widget.
Readable
receives-default
Whether the widget will receive the default action when it is focused.
Readable | Writeable
root
The Root
widget of the widget tree containing this widget.
This will be None
if the widget is not contained in a root widget.
Readable
scale-factor
The scale factor of the widget.
Readable
sensitive
Whether the widget responds to input.
Readable | Writeable
tooltip-markup
Sets the text of tooltip to be the given string, which is marked up with Pango markup.
Also see Tooltip::set_markup()
.
This is a convenience property which will take care of getting the
tooltip shown if the given string is not None
:
has-tooltip
will automatically be set to true
and there will be taken care of query-tooltip
in
the default signal handler.
Note that if both tooltip-text
and
tooltip-markup
are set, the last one wins.
Readable | Writeable
tooltip-text
Sets the text of tooltip to be the given string.
Also see Tooltip::set_text()
.
This is a convenience property which will take care of getting the
tooltip shown if the given string is not None
:
has-tooltip
will automatically be set to true
and there will be taken care of query-tooltip
in
the default signal handler.
Note that if both tooltip-text
and
tooltip-markup
are set, the last one wins.
Readable | Writeable
valign
How to distribute vertical space if widget gets extra space.
Readable | Writeable
vexpand
Whether to expand vertically.
Readable | Writeable
vexpand-set
Whether to use the vexpand
property.
Readable | Writeable
visible
Whether the widget is visible.
Readable | Writeable
width-request
Override for width request of the widget.
If this is -1, the natural request will be used.
Readable | Writeable
Accessible
accessible-role
The accessible role of the given Accessible
implementation.
The accessible role cannot be changed once set.
Readable | Writeable
Implements
WidgetExt
, glib::ObjectExt
, AccessibleExt
, BuildableExt
, ConstraintTargetExt
, WidgetExtManual
, AccessibleExtManual
Implementations§
source§impl TreeExpander
impl TreeExpander
sourcepub fn new() -> TreeExpander
pub fn new() -> TreeExpander
sourcepub fn builder() -> TreeExpanderBuilder
pub fn builder() -> TreeExpanderBuilder
Creates a new builder-pattern struct instance to construct TreeExpander
objects.
This method returns an instance of TreeExpanderBuilder
which can be used to create TreeExpander
objects.
sourcepub fn hides_expander(&self) -> bool
Available on crate feature v4_10
only.
pub fn hides_expander(&self) -> bool
v4_10
only.Gets whether the TreeExpander should be hidden in a GtkTreeListRow.
Returns
TRUE if the expander icon should be hidden. Otherwise FALSE.
sourcepub fn is_indent_for_depth(&self) -> bool
Available on crate feature v4_10
only.
pub fn is_indent_for_depth(&self) -> bool
v4_10
only.TreeExpander indents each level of depth with an additional indent.
Returns
TRUE if the child should be indented . Otherwise FALSE.
sourcepub fn is_indent_for_icon(&self) -> bool
Available on crate feature v4_6
only.
pub fn is_indent_for_icon(&self) -> bool
v4_6
only.TreeExpander indents the child by the width of an expander-icon if it is not expandable.
Returns
TRUE if the child should be indented when not expandable. Otherwise FALSE.
sourcepub fn item(&self) -> Option<Object>
pub fn item(&self) -> Option<Object>
Forwards the item set on the TreeListRow
that @self is managing.
This call is essentially equivalent to calling:
⚠️ The following code is in c ⚠️
gtk_tree_list_row_get_item (gtk_tree_expander_get_list_row (@self));
Returns
The item of the row
sourcepub fn list_row(&self) -> Option<TreeListRow>
pub fn list_row(&self) -> Option<TreeListRow>
sourcepub fn set_hide_expander(&self, hide_expander: bool)
Available on crate feature v4_10
only.
pub fn set_hide_expander(&self, hide_expander: bool)
v4_10
only.Sets whether the expander icon should be visible in a GtkTreeListRow.
hide_expander
TRUE if the expander should be hidden. Otherwise FALSE.
sourcepub fn set_indent_for_depth(&self, indent_for_depth: bool)
Available on crate feature v4_10
only.
pub fn set_indent_for_depth(&self, indent_for_depth: bool)
v4_10
only.Sets if the TreeExpander should indent the child according to its depth.
indent_for_depth
TRUE if the child should be indented. Otherwise FALSE.
sourcepub fn set_indent_for_icon(&self, indent_for_icon: bool)
Available on crate feature v4_6
only.
pub fn set_indent_for_icon(&self, indent_for_icon: bool)
v4_6
only.Sets if the TreeExpander should indent the child by the width of an expander-icon when it is not expandable.
indent_for_icon
TRUE if the child should be indented without expander. Otherwise FALSE.
sourcepub fn set_list_row(&self, list_row: Option<&TreeListRow>)
pub fn set_list_row(&self, list_row: Option<&TreeListRow>)
pub fn connect_child_notify<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId
pub fn connect_hide_expander_notify<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId
v4_10
only.pub fn connect_indent_for_depth_notify<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId
v4_10
only.pub fn connect_indent_for_icon_notify<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId
v4_6
only.pub fn connect_item_notify<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId
pub fn connect_list_row_notify<F: Fn(&Self) + 'static>( &self, f: F ) -> SignalHandlerId
Trait Implementations§
source§impl Clone for TreeExpander
impl Clone for TreeExpander
source§impl Debug for TreeExpander
impl Debug for TreeExpander
source§impl Default for TreeExpander
impl Default for TreeExpander
source§impl Display for TreeExpander
impl Display for TreeExpander
source§impl HasParamSpec for TreeExpander
impl HasParamSpec for TreeExpander
type ParamSpec = ParamSpecObject
§type SetValue = TreeExpander
type SetValue = TreeExpander
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, TreeExpander>
fn param_spec_builder() -> Self::BuilderFn
source§impl Hash for TreeExpander
impl Hash for TreeExpander
source§impl Ord for TreeExpander
impl Ord for TreeExpander
source§impl ParentClassIs for TreeExpander
impl ParentClassIs for TreeExpander
source§impl<OT: ObjectType> PartialEq<OT> for TreeExpander
impl<OT: ObjectType> PartialEq<OT> for TreeExpander
source§impl<OT: ObjectType> PartialOrd<OT> for TreeExpander
impl<OT: ObjectType> PartialOrd<OT> for TreeExpander
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresource§impl StaticType for TreeExpander
impl StaticType for TreeExpander
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for TreeExpander
impl IsA<Accessible> for TreeExpander
impl IsA<Buildable> for TreeExpander
impl IsA<ConstraintTarget> for TreeExpander
impl IsA<Widget> for TreeExpander
Auto Trait Implementations§
impl RefUnwindSafe for TreeExpander
impl !Send for TreeExpander
impl !Sync for TreeExpander
impl Unpin for TreeExpander
impl UnwindSafe for TreeExpander
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source§fn unblock_signal(&self, handler_id: &SignalHandlerId)
fn unblock_signal(&self, handler_id: &SignalHandlerId)
source§fn stop_signal_emission(&self, signal_id: SignalId, detail: Option<Quark>)
fn stop_signal_emission(&self, signal_id: SignalId, detail: Option<Quark>)
source§fn stop_signal_emission_by_name(&self, signal_name: &str)
fn stop_signal_emission_by_name(&self, signal_name: &str)
source§fn connect<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static,
fn connect<F>( &self, signal_name: &str, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static,
signal_name
on this object. Read moresource§fn connect_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static,
fn connect_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static,
signal_id
on this object. Read moresource§fn connect_local<F>(
&self,
signal_name: &str,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value> + 'static,
fn connect_local<F>( &self, signal_name: &str, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value> + 'static,
signal_name
on this object. Read moresource§fn connect_local_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F
) -> SignalHandlerIdwhere
F: Fn(&[Value]) -> Option<Value> + 'static,
fn connect_local_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F ) -> SignalHandlerIdwhere F: Fn(&[Value]) -> Option<Value> + 'static,
signal_id
on this object. Read moresource§unsafe 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 moresource§unsafe 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 moresource§fn 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 moresource§fn 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
on this object. Read moresource§fn watch_closure(&self, closure: &impl AsRef<Closure>)
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
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) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec) + Send + Sync + 'static,
fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + Send + Sync + 'static,
notify
signal of the object. Read moresource§fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec) + 'static,
fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec) + 'static,
notify
signal of the object. Read moresource§unsafe 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