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.
It is important to mention that you want to set the
focusable
property to FALSE when using this
widget, as you want the keyboard focus to be in the treexpander, and not
inside the list to make use of the keybindings.
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.
§Shortcuts and Gestures
TreeExpander
supports the following keyboard shortcuts:
- + or * expands the expander.
- - or / collapses the expander.
- Left and right arrow keys, when combined with Shift or Ctrl+Shift, will expand or collapse, depending on the locale’s text direction.
- Ctrl+␣ toggles the expander state.
The row can also expand on drag gestures.
§Actions
TreeExpander
defines a set of built-in actions:
listitem.expand
expands the expander if it can be expanded.listitem.collapse
collapses the expander.listitem.toggle-expand
tries to expand the expander if it was collapsed or collapses it if it was expanded.
§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
Until GTK 4.10, TreeExpander
used the GTK_ACCESSIBLE_ROLE_GROUP
role.
Since GTK 4.12, TreeExpander
uses the GTK_ACCESSIBLE_ROLE_BUTTON
role.
Toggling it will change the GTK_ACCESSIBLE_STATE_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
, [trait@glib::ObjectExt
], AccessibleExt
, BuildableExt
, ConstraintTargetExt
, WidgetExtManual
, AccessibleExtManual
GLib type: GObject with reference counted clone semantics.
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 HasParamSpec for TreeExpander
impl HasParamSpec for TreeExpander
type ParamSpec = ParamSpecObject
Source§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§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 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
Source§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 Freeze for TreeExpander
impl RefUnwindSafe for TreeExpander
impl !Send for TreeExpander
impl !Sync for TreeExpander
impl Unpin for TreeExpander
impl UnwindSafe for TreeExpander
Blanket Implementations§
Source§impl<O> AccessibleExt for Owhere
O: IsA<Accessible>,
impl<O> AccessibleExt for Owhere
O: IsA<Accessible>,
Source§fn announce(&self, message: &str, priority: AccessibleAnnouncementPriority)
fn announce(&self, message: &str, priority: AccessibleAnnouncementPriority)
v4_14
only.Source§fn accessible_parent(&self) -> Option<Accessible>
fn accessible_parent(&self) -> Option<Accessible>
v4_10
only.Source§fn accessible_role(&self) -> AccessibleRole
fn accessible_role(&self) -> AccessibleRole
Source§fn at_context(&self) -> ATContext
fn at_context(&self) -> ATContext
v4_10
only.Accessible
. Read moreSource§fn bounds(&self) -> Option<(i32, i32, i32, i32)>
fn bounds(&self) -> Option<(i32, i32, i32, i32)>
v4_10
only.Source§fn first_accessible_child(&self) -> Option<Accessible>
fn first_accessible_child(&self) -> Option<Accessible>
v4_10
only.Source§fn next_accessible_sibling(&self) -> Option<Accessible>
fn next_accessible_sibling(&self) -> Option<Accessible>
v4_10
only.Source§fn platform_state(&self, state: AccessiblePlatformState) -> bool
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v4_10
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fn reset_property(&self, property: AccessibleProperty)
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&self,
parent: Option<&impl IsA<Accessible>>,
next_sibling: Option<&impl IsA<Accessible>>,
)
fn set_accessible_parent( &self, parent: Option<&impl IsA<Accessible>>, next_sibling: Option<&impl IsA<Accessible>>, )
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&self,
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)
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Accessible
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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for Twhere
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details: Quark,
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&self,
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O: ObjectType,
fn bind_property<'a, 'f, 't, O>(
&'a self,
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&self,
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fn set_focus_on_click(&self, focus_on_click: bool)
Source§fn set_focusable(&self, focusable: bool)
fn set_focusable(&self, focusable: bool)
Source§fn set_font_map(&self, font_map: Option<&impl IsA<FontMap>>)
fn set_font_map(&self, font_map: Option<&impl IsA<FontMap>>)
Source§fn set_font_options(&self, options: Option<&FontOptions>)
fn set_font_options(&self, options: Option<&FontOptions>)
cairo::FontOptions
used for Pango rendering
in this widget. Read moreSource§fn set_halign(&self, align: Align)
fn set_halign(&self, align: Align)
Source§fn set_has_tooltip(&self, has_tooltip: bool)
fn set_has_tooltip(&self, has_tooltip: bool)
has-tooltip
property on @self to @has_tooltip. Read moreSource§fn set_hexpand(&self, expand: bool)
fn set_hexpand(&self, expand: bool)
Source§fn set_hexpand_set(&self, set: bool)
fn set_hexpand_set(&self, set: bool)
Source§fn set_layout_manager(&self, layout_manager: Option<impl IsA<LayoutManager>>)
fn set_layout_manager(&self, layout_manager: Option<impl IsA<LayoutManager>>)
Source§fn set_margin_bottom(&self, margin: i32)
fn set_margin_bottom(&self, margin: i32)
Source§fn set_margin_end(&self, margin: i32)
fn set_margin_end(&self, margin: i32)
Source§fn set_margin_start(&self, margin: i32)
fn set_margin_start(&self, margin: i32)
Source§fn set_margin_top(&self, margin: i32)
fn set_margin_top(&self, margin: i32)
Source§fn set_widget_name(&self, name: &str)
fn set_widget_name(&self, name: &str)
Source§fn set_opacity(&self, opacity: f64)
fn set_opacity(&self, opacity: f64)
Source§fn set_overflow(&self, overflow: Overflow)
fn set_overflow(&self, overflow: Overflow)
Source§fn set_parent(&self, parent: &impl IsA<Widget>)
fn set_parent(&self, parent: &impl IsA<Widget>)
Source§fn set_receives_default(&self, receives_default: bool)
fn set_receives_default(&self, receives_default: bool)
Source§fn set_sensitive(&self, sensitive: bool)
fn set_sensitive(&self, sensitive: bool)
Source§fn set_size_request(&self, width: i32, height: i32)
fn set_size_request(&self, width: i32, height: i32)
Source§fn set_state_flags(&self, flags: StateFlags, clear: bool)
fn set_state_flags(&self, flags: StateFlags, clear: bool)
Source§fn set_tooltip_markup(&self, markup: Option<&str>)
fn set_tooltip_markup(&self, markup: Option<&str>)
Source§fn set_tooltip_text(&self, text: Option<&str>)
fn set_tooltip_text(&self, text: Option<&str>)
Source§fn set_valign(&self, align: Align)
fn set_valign(&self, align: Align)
Source§fn set_vexpand(&self, expand: bool)
fn set_vexpand(&self, expand: bool)
Source§fn set_vexpand_set(&self, set: bool)
fn set_vexpand_set(&self, set: bool)
Source§fn set_visible(&self, visible: bool)
fn set_visible(&self, visible: bool)
Source§fn should_layout(&self) -> bool
fn should_layout(&self) -> bool
Source§fn size_allocate(&self, allocation: &Allocation, baseline: i32)
fn size_allocate(&self, allocation: &Allocation, baseline: i32)
Source§fn snapshot_child(
&self,
child: &impl IsA<Widget>,
snapshot: &impl IsA<Snapshot>,
)
fn snapshot_child( &self, child: &impl IsA<Widget>, snapshot: &impl IsA<Snapshot>, )
Source§fn translate_coordinates(
&self,
dest_widget: &impl IsA<Widget>,
src_x: f64,
src_y: f64,
) -> Option<(f64, f64)>
fn translate_coordinates( &self, dest_widget: &impl IsA<Widget>, src_x: f64, src_y: f64, ) -> Option<(f64, f64)>
Source§fn trigger_tooltip_query(&self)
fn trigger_tooltip_query(&self)
Source§fn unrealize(&self)
fn unrealize(&self)
Source§fn unset_state_flags(&self, flags: StateFlags)
fn unset_state_flags(&self, flags: StateFlags)
Source§fn height_request(&self) -> i32
fn height_request(&self) -> i32
Source§fn set_height_request(&self, height_request: i32)
fn set_height_request(&self, height_request: i32)
Source§fn width_request(&self) -> i32
fn width_request(&self) -> i32
Source§fn set_width_request(&self, width_request: i32)
fn set_width_request(&self, width_request: i32)
Source§fn connect_destroy<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
fn connect_destroy<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
Source§fn connect_direction_changed<F: Fn(&Self, TextDirection) + 'static>(
&self,
f: F,
) -> SignalHandlerId
fn connect_direction_changed<F: Fn(&Self, TextDirection) + 'static>( &self, f: F, ) -> SignalHandlerId
Source§fn connect_hide<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
fn connect_hide<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
Source§fn connect_map<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
fn connect_map<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
Source§fn connect_mnemonic_activate<F: Fn(&Self, bool) -> Propagation + 'static>(
&self,
f: F,
) -> SignalHandlerId
fn connect_mnemonic_activate<F: Fn(&Self, bool) -> Propagation + 'static>( &self, f: F, ) -> SignalHandlerId
Source§fn connect_move_focus<F: Fn(&Self, DirectionType) + 'static>(
&self,
f: F,
) -> SignalHandlerId
fn connect_move_focus<F: Fn(&Self, DirectionType) + 'static>( &self, f: F, ) -> SignalHandlerId
fn emit_move_focus(&self, direction: DirectionType)
Source§fn connect_query_tooltip<F: Fn(&Self, i32, i32, bool, &Tooltip) -> bool + 'static>(
&self,
f: F,
) -> SignalHandlerId
fn connect_query_tooltip<F: Fn(&Self, i32, i32, bool, &Tooltip) -> bool + 'static>( &self, f: F, ) -> SignalHandlerId
Source§fn connect_realize<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
fn connect_realize<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
gdk::Surface
. Read moreSource§fn connect_show<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
fn connect_show<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
Source§fn connect_state_flags_changed<F: Fn(&Self, StateFlags) + 'static>(
&self,
f: F,
) -> SignalHandlerId
fn connect_state_flags_changed<F: Fn(&Self, StateFlags) + 'static>( &self, f: F, ) -> SignalHandlerId
Source§fn connect_unmap<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
fn connect_unmap<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
Source§fn connect_unrealize<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
fn connect_unrealize<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
gdk::Surface
associated with @widget is destroyed. Read more