Struct Backend

pub struct Backend(/* private fields */);

Implementations

impl Backend

pub fn get_font_options(&self) -> Option<FontOptions>

Retrieves the font options for self.

Returns

the font options of the Backend. The returned cairo::FontOptions is owned by the backend and should not be modified or freed

pub fn get_resolution(&self) -> f64

Gets the resolution for font handling on the screen.

The resolution is a scale factor between points specified in a pango::FontDescription and cairo units. The default value is 96.0, meaning that a 10 point font will be 13 units high (10 * 96. / 72. = 13.3).

Clutter will set the resolution using the current backend when initializing; the resolution is also stored in the Settings:font-dpi property.

Returns

the current resolution, or -1 if no resolution has been set.

pub fn set_font_options(&self, options: &FontOptions)

Sets the new font options for self. The Backend will copy the cairo::FontOptions.

If options is None, the first following call to Backend::get_font_options will return the default font options for self.

This function is intended for actors creating a Pango layout using the PangoCairo API.

options

Cairo font options for the backend, or None

pub fn connect_font_changed<F: Fn(&Backend) + 'static>( &self, f: F, ) -> SignalHandlerId

The ::font-changed signal is emitted each time the font options have been changed through Settings.

pub fn connect_resolution_changed<F: Fn(&Backend) + 'static>( &self, f: F, ) -> SignalHandlerId

The ::resolution-changed signal is emitted each time the font resolutions has been changed through Settings.

pub fn connect_settings_changed<F: Fn(&Backend) + 'static>( &self, f: F, ) -> SignalHandlerId

The ::settings-changed signal is emitted each time the Settings properties have been changed.

Trait Implementations

impl Clone for Backend

fn clone(&self) -> Backend

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Backend

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for Backend

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Hash for Backend

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Backend

fn cmp(&self, other: &Backend) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<T: ObjectType> PartialEq<T> for Backend

fn eq(&self, other: &T) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: ObjectType> PartialOrd<T> for Backend

fn partial_cmp(&self, other: &T) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StaticType for Backend

fn static_type() -> Type

Returns the type identifier of Self.

impl Eq for Backend