Struct zng::widget::builder::WidgetBuilderProperties

pub struct WidgetBuilderProperties { /* private fields */ }

Direct property access in WidgetBuilder and WidgetBuilding.

Implementations

impl WidgetBuilderProperties

pub fn property( &self, property_id: PropertyId, ) -> Option<BuilderPropertyRef<'_>>

Reference the property, if it is present.

pub fn property_mut( &mut self, property_id: PropertyId, ) -> Option<BuilderPropertyMut<'_>>

Modify the property, if it is present.

pub fn properties(&self) -> impl Iterator<Item = BuilderPropertyRef<'_>>

Iterate over the current properties.

The properties may not be sorted in the correct order if the builder has never built.

pub fn properties_mut(&mut self) -> impl Iterator<Item = BuilderPropertyMut<'_>>

iterate over mutable references to the current properties.

pub fn capture_value<T>(&mut self, property_id: PropertyId) -> Option<T>

where T: VarValue,

Flags the property as captured and downcast the input value.

Unlike other property kinds you can capture values in the WidgetBuilder, note that the value may not the final value, unless you are capturing on build.

Other property kinds can only be captured in WidgetBuilding as their values strongly depend on the final when blocks that are only applied after building starts.

pub fn capture_value_or_else<T>( &mut self, property_id: PropertyId, or_else: impl FnOnce() -> T, ) -> T

where T: VarValue,

Flags the property as captured and downcast the input value, or calls or_else to generate the value.

pub fn capture_value_or_default<T>(&mut self, property_id: PropertyId) -> T

where T: VarValue + Default,

Flags the property as captured and downcast the input value, or returns the default value.