#[repr(transparent)]pub struct LevelBar { /* private fields */ }Expand description
LevelBar is a widget that can be used as a level indicator.
Typical use cases are displaying the strength of a password, or showing the charge level of a battery.
Use set_value() to set the current value, and
add_offset_value() to set the value offsets at which
the bar will be considered in a different state. GTK will add a few
offsets by default on the level bar: LEVEL_BAR_OFFSET_LOW,
LEVEL_BAR_OFFSET_HIGH and LEVEL_BAR_OFFSET_FULL, with
values 0.25, 0.75 and 1.0 respectively.
Note that it is your responsibility to update preexisting offsets when changing the minimum or maximum value. GTK will simply clamp them to the new range.
Adding a custom offset on the bar
⚠️ The following code is in c ⚠️
static GtkWidget *
create_level_bar (void)
{
GtkWidget *widget;
GtkLevelBar *bar;
widget = gtk_level_bar_new ();
bar = GTK_LEVEL_BAR (widget);
// This changes the value of the default low offset
gtk_level_bar_add_offset_value (bar,
GTK_LEVEL_BAR_OFFSET_LOW,
0.10);
// This adds a new offset to the bar; the application will
// be able to change its color CSS like this:
//
// levelbar block.my-offset {
// background-color: magenta;
// border-style: solid;
// border-color: black;
// border-style: 1px;
// }
gtk_level_bar_add_offset_value (bar, "my-offset", 0.60);
return widget;
}
The default interval of values is between zero and one, but it’s possible
to modify the interval using set_min_value() and
set_max_value(). The value will be always drawn in
proportion to the admissible interval, i.e. a value of 15 with a specified
interval between 10 and 20 is equivalent to a value of 0.5 with an interval
between 0 and 1. When LevelBarMode::Discrete is used, the bar level
is rendered as a finite number of separated blocks instead of a single one.
The number of blocks that will be rendered is equal to the number of units
specified by the admissible interval.
For instance, to build a bar rendered with five blocks, it’s sufficient to set the minimum value to 0 and the maximum value to 5 after changing the indicator mode to discrete.
GtkLevelBar as GtkBuildable
The LevelBar implementation of the Buildable interface supports a
custom
CSS nodes
levelbar[.discrete]
╰── trough
├── block.filled.level-name
┊
├── block.empty
┊
LevelBar has a main CSS node with name levelbar and one of the style
classes .discrete or .continuous and a subnode with name trough. Below the
trough node are a number of nodes with name block and style class .filled
or .empty. In continuous mode, there is exactly one node of each, in discrete
mode, the number of filled and unfilled nodes corresponds to blocks that are
drawn. The block.filled nodes also get a style class .level-name corresponding
to the level for the current value.
In horizontal orientation, the nodes are always arranged from left to right, regardless of text direction.
Accessibility
LevelBar uses the AccessibleRole::Meter role.
Implements
WidgetExt, glib::ObjectExt, AccessibleExt, BuildableExt, ConstraintTargetExt, AccessibleRangeExt, OrientableExt, WidgetExtManual, AccessibleExtManual
Implementations§
source§impl LevelBar
impl LevelBar
sourcepub fn for_interval(min_value: f64, max_value: f64) -> LevelBar
pub fn for_interval(min_value: f64, max_value: f64) -> LevelBar
sourcepub fn builder() -> LevelBarBuilder
pub fn builder() -> LevelBarBuilder
Creates a new builder-pattern struct instance to construct LevelBar objects.
This method returns an instance of LevelBarBuilder which can be used to create LevelBar objects.
sourcepub fn add_offset_value(&self, name: &str, value: f64)
pub fn add_offset_value(&self, name: &str, value: f64)
Adds a new offset marker on @self at the position specified by @value.
When the bar value is in the interval topped by @value (or between @value
and property::LevelBar::max-value in case the offset is the last one
on the bar) a style class named level-@name will be applied
when rendering the level bar fill.
If another offset marker named @name exists, its value will be replaced by @value.
name
the name of the new offset
value
the value for the new offset
sourcepub fn is_inverted(&self) -> bool
pub fn is_inverted(&self) -> bool
sourcepub fn mode(&self) -> LevelBarMode
pub fn mode(&self) -> LevelBarMode
sourcepub fn remove_offset_value(&self, name: Option<&str>)
pub fn remove_offset_value(&self, name: Option<&str>)
Removes an offset marker from a LevelBar.
The marker must have been previously added with
add_offset_value().
name
the name of an offset in the bar
sourcepub fn set_inverted(&self, inverted: bool)
pub fn set_inverted(&self, inverted: bool)
sourcepub fn set_max_value(&self, value: f64)
pub fn set_max_value(&self, value: f64)
sourcepub fn set_min_value(&self, value: f64)
pub fn set_min_value(&self, value: f64)
sourcepub fn set_mode(&self, mode: LevelBarMode)
pub fn set_mode(&self, mode: LevelBarMode)
sourcepub fn connect_offset_changed<F: Fn(&Self, &str) + 'static>(
&self,
detail: Option<&str>,
f: F
) -> SignalHandlerId
pub fn connect_offset_changed<F: Fn(&Self, &str) + 'static>(
&self,
detail: Option<&str>,
f: F
) -> SignalHandlerId
Emitted when an offset specified on the bar changes value.
This typically is the result of a add_offset_value()
call.
The signal supports detailed connections; you can connect to the detailed signal “changed::x” in order to only receive callbacks when the value of offset “x” changes.
name
the name of the offset that changed value
pub fn connect_inverted_notify<F: Fn(&Self) + 'static>(
&self,
f: F
) -> SignalHandlerId
pub fn connect_max_value_notify<F: Fn(&Self) + 'static>(
&self,
f: F
) -> SignalHandlerId
pub fn connect_min_value_notify<F: Fn(&Self) + 'static>(
&self,
f: F
) -> SignalHandlerId
pub fn connect_mode_notify<F: Fn(&Self) + 'static>(
&self,
f: F
) -> SignalHandlerId
pub fn connect_value_notify<F: Fn(&Self) + 'static>(
&self,
f: F
) -> SignalHandlerId
Trait Implementations§
source§impl Ord for LevelBar
impl Ord for LevelBar
source§impl<OT: ObjectType> PartialEq<OT> for LevelBar
impl<OT: ObjectType> PartialEq<OT> for LevelBar
source§impl<OT: ObjectType> PartialOrd<OT> for LevelBar
impl<OT: ObjectType> PartialOrd<OT> for LevelBar
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 LevelBar
impl StaticType for LevelBar
source§fn static_type() -> Type
fn static_type() -> Type
Self.impl Eq for LevelBar
impl IsA<Accessible> for LevelBar
impl IsA<AccessibleRange> for LevelBar
impl IsA<Buildable> for LevelBar
impl IsA<ConstraintTarget> for LevelBar
impl IsA<Orientable> for LevelBar
impl IsA<Widget> for LevelBar
Auto Trait Implementations§
impl RefUnwindSafe for LevelBar
impl !Send for LevelBar
impl !Sync for LevelBar
impl Unpin for LevelBar
impl UnwindSafe for LevelBar
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source§impl<O> AccessibleExtManual for Owhere
O: IsA<Accessible>,
impl<O> AccessibleExtManual for Owhere
O: IsA<Accessible>,
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fn update_property(&self, properties: &[Property<'_>])
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fn update_relation(&self, relations: &[Relation<'_>])
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