Trait druid::piet::cairo::glib::ToValue

pub trait ToValue {
    // Required methods
    fn to_value(&self) -> Value;
    fn value_type(&self) -> Type;
}

Expand description

Trait to convert a value to a Value.

Similar to other common conversion traits, the following invariants are guaranteed:

Invertibility: x.to_value().get().unwrap() == x. In words, FromValue is the inverse of ToValue.
Idempotence: x.to_value() == x.to_value().to_value(). In words, applying ToValue multiple times yields the same result as applying it once. Idempotence also applies the other way around: value.get::<Value>() is a no-op.

There is also the possibility to wrap values within values, see BoxedValue. All (un-)boxing needs to be done manually, and will be preserved under the conversion methods.

The conversion methods may cause values to be cloned, which may result in reference counter changes or heap allocations depending on the source and target type.

Required Methods§

fn to_value(&self) -> Value

Convert a value to a Value.

Trait druid::piet::cairo::glib::ToValue

Required Methods§

fn to_value(&self) -> Value

fn value_type(&self) -> Type

Implementations on Foreign Types§

impl ToValue for PrintDuplex

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for ApplicationInhibitFlags

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for PanDirection

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for Align

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for TextSearchFlags

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for RecentChooserError

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for PrintError

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for DeleteType

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for InputPurpose

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for PrintOperationAction

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for PolicyType

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for TargetFlags

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for CornerType

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for DialogFlags

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for WindowType

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for PrintQuality

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for InputHints

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for ButtonsType

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for StateFlags

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for Orientation

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for SortType

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for License

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for IconViewDropPosition

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for TextDirection

fn to_value(&self) -> Value

fn value_type(&self) -> Type

impl ToValue for RegionFlags

fn to_value(&self) -> Value

fn value_type(&self) -> Type