pub struct FrameClock { /* private fields */ }
Expand description
A FrameClock
tells the application when to update and repaint
a surface.
This may be synced to the vertical refresh rate of the monitor, for example. Even when the frame clock uses a simple timer rather than a hardware-based vertical sync, the frame clock helps because it ensures everything paints at the same time (reducing the total number of frames).
The frame clock can also automatically stop painting when it knows the frames will not be visible, or scale back animation framerates.
FrameClock
is designed to be compatible with an OpenGL-based implementation
or with mozRequestAnimationFrame in Firefox, for example.
A frame clock is idle until someone requests a frame with
request_phase()
. At some later point that makes sense
for the synchronization being implemented, the clock will process a frame and
emit signals for each phase that has been requested. (See the signals of the
FrameClock
class for documentation of the phases.
FrameClockPhase::UPDATE
and the update
signal
are most interesting for application writers, and are used to update the
animations, using the frame time given by frame_time()
.
The frame time is reported in microseconds and generally in the same
timescale as g_get_monotonic_time(), however, it is not the same
as g_get_monotonic_time(). The frame time does not advance during
the time a frame is being painted, and outside of a frame, an attempt
is made so that all calls to frame_time()
that
are called at a “similar” time get the same value. This means that
if different animations are timed by looking at the difference in
time between an initial value from frame_time()
and the value inside the update
signal of the clock,
they will stay exactly synchronized.
This is an Abstract Base Class, you cannot instantiate it.
§Signals
§after-paint
This signal ends processing of the frame.
Applications should generally not handle this signal.
§before-paint
Begins processing of the frame.
Applications should generally not handle this signal.
§flush-events
Used to flush pending motion events that are being batched up and compressed together.
Applications should not handle this signal.
§layout
Emitted as the second step of toolkit and application processing of the frame.
Any work to update sizes and positions of application elements should be performed. GTK normally handles this internally.
§paint
Emitted as the third step of toolkit and application processing of the frame.
The frame is repainted. GDK normally handles this internally and
emits render
signals which are turned into
GtkWidget::snapshot signals
by GTK.
§resume-events
Emitted after processing of the frame is finished.
This signal is handled internally by GTK to resume normal event processing. Applications should not handle this signal.
§update
Emitted as the first step of toolkit and application processing of the frame.
Animations should be updated using FrameClock::frame_time()
.
Applications can connect directly to this signal, or use
gtk_widget_add_tick_callback()
as a more convenient interface.
GLib type: GObject with reference counted clone semantics.
Implementations§
Source§impl FrameClock
impl FrameClock
Sourcepub fn begin_updating(&self)
pub fn begin_updating(&self)
Starts updates for an animation.
Until a matching call to end_updating()
is made,
the frame clock will continually request a new frame with the
FrameClockPhase::UPDATE
phase. This function may be called multiple
times and frames will be requested until gdk_frame_clock_end_updating()
is called the same number of times.
Sourcepub fn end_updating(&self)
pub fn end_updating(&self)
Stops updates for an animation.
See the documentation for begin_updating()
.
Sourcepub fn current_timings(&self) -> Option<FrameTimings>
pub fn current_timings(&self) -> Option<FrameTimings>
Gets the frame timings for the current frame.
§Returns
the FrameTimings
for the
frame currently being processed, or even no frame is being
processed, for the previous frame. Before any frames have been
processed, returns None
.
Sourcepub fn fps(&self) -> f64
pub fn fps(&self) -> f64
Calculates the current frames-per-second, based on the frame timings of @self.
§Returns
the current fps, as a double
Sourcepub fn frame_counter(&self) -> i64
pub fn frame_counter(&self) -> i64
FrameClock
maintains a 64-bit counter that increments for
each frame drawn.
§Returns
inside frame processing, the value of the frame counter for the current frame. Outside of frame processing, the frame counter for the last frame.
Sourcepub fn frame_time(&self) -> i64
pub fn frame_time(&self) -> i64
Gets the time that should currently be used for animations.
Inside the processing of a frame, it’s the time used to compute the animation position of everything in a frame. Outside of a frame, it’s the time of the conceptual “previous frame,” which may be either the actual previous frame time, or if that’s too old, an updated time.
§Returns
a timestamp in microseconds, in the timescale of of g_get_monotonic_time().
Sourcepub fn history_start(&self) -> i64
pub fn history_start(&self) -> i64
Returns the frame counter for the oldest frame available in history.
FrameClock
internally keeps a history of FrameTimings
objects for recent frames that can be retrieved with
timings()
. The set of stored frames
is the set from the counter values given by
history_start()
and
frame_counter()
, inclusive.
§Returns
the frame counter value for the oldest frame
that is available in the internal frame history of the
FrameClock
Sourcepub fn refresh_info(&self, base_time: i64) -> (i64, i64)
pub fn refresh_info(&self, base_time: i64) -> (i64, i64)
Predicts a presentation time, based on history.
Using the frame history stored in the frame clock, finds the last known presentation time and refresh interval, and assuming that presentation times are separated by the refresh interval, predicts a presentation time that is a multiple of the refresh interval after the last presentation time, and later than @base_time.
§base_time
base time for determining a presentaton time
§Returns
§refresh_interval_return
a location to store the
determined refresh interval, or None
. A default refresh interval of
1/60th of a second will be stored if no history is present.
§presentation_time_return
a location to store the next candidate presentation time after the given base time. 0 will be will be stored if no history is present.
Sourcepub fn timings(&self, frame_counter: i64) -> Option<FrameTimings>
pub fn timings(&self, frame_counter: i64) -> Option<FrameTimings>
Retrieves a FrameTimings
object holding timing information
for the current frame or a recent frame.
The FrameTimings
object may not yet be complete: see
FrameTimings::is_complete()
and
history_start()
.
§frame_counter
the frame counter value identifying the frame to be received
§Returns
the FrameTimings
object
for the specified frame, or None
if it is not available
Sourcepub fn request_phase(&self, phase: FrameClockPhase)
pub fn request_phase(&self, phase: FrameClockPhase)
Asks the frame clock to run a particular phase.
The signal corresponding the requested phase will be emitted the next
time the frame clock processes. Multiple calls to
gdk_frame_clock_request_phase() will be combined together
and only one frame processed. If you are displaying animated
content and want to continually request the
FrameClockPhase::UPDATE
phase for a period of time,
you should use begin_updating()
instead,
since this allows GTK to adjust system parameters to get maximally
smooth animations.
§phase
the phase that is requested
Sourcepub fn connect_after_paint<F: Fn(&Self) + 'static>(
&self,
f: F,
) -> SignalHandlerId
pub fn connect_after_paint<F: Fn(&Self) + 'static>( &self, f: F, ) -> SignalHandlerId
This signal ends processing of the frame.
Applications should generally not handle this signal.
Sourcepub fn connect_before_paint<F: Fn(&Self) + 'static>(
&self,
f: F,
) -> SignalHandlerId
pub fn connect_before_paint<F: Fn(&Self) + 'static>( &self, f: F, ) -> SignalHandlerId
Begins processing of the frame.
Applications should generally not handle this signal.
Sourcepub fn connect_flush_events<F: Fn(&Self) + 'static>(
&self,
f: F,
) -> SignalHandlerId
pub fn connect_flush_events<F: Fn(&Self) + 'static>( &self, f: F, ) -> SignalHandlerId
Used to flush pending motion events that are being batched up and compressed together.
Applications should not handle this signal.
Sourcepub fn connect_layout<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
pub fn connect_layout<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
Emitted as the second step of toolkit and application processing of the frame.
Any work to update sizes and positions of application elements should be performed. GTK normally handles this internally.
Sourcepub fn connect_paint<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
pub fn connect_paint<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
Emitted as the third step of toolkit and application processing of the frame.
The frame is repainted. GDK normally handles this internally and
emits render
signals which are turned into
GtkWidget::snapshot signals
by GTK.
Sourcepub fn connect_resume_events<F: Fn(&Self) + 'static>(
&self,
f: F,
) -> SignalHandlerId
pub fn connect_resume_events<F: Fn(&Self) + 'static>( &self, f: F, ) -> SignalHandlerId
Emitted after processing of the frame is finished.
This signal is handled internally by GTK to resume normal event processing. Applications should not handle this signal.
Sourcepub fn connect_update<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
pub fn connect_update<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId
Emitted as the first step of toolkit and application processing of the frame.
Animations should be updated using frame_time()
.
Applications can connect directly to this signal, or use
gtk_widget_add_tick_callback()
as a more convenient interface.
Trait Implementations§
Source§impl Clone for FrameClock
impl Clone for FrameClock
Source§impl Debug for FrameClock
impl Debug for FrameClock
Source§impl HasParamSpec for FrameClock
impl HasParamSpec for FrameClock
type ParamSpec = ParamSpecObject
Source§type SetValue = FrameClock
type SetValue = FrameClock
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, FrameClock>
fn param_spec_builder() -> Self::BuilderFn
Source§impl Hash for FrameClock
impl Hash for FrameClock
Source§impl Ord for FrameClock
impl Ord for FrameClock
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 FrameClock
impl ParentClassIs for FrameClock
Source§impl<OT: ObjectType> PartialEq<OT> for FrameClock
impl<OT: ObjectType> PartialEq<OT> for FrameClock
Source§impl<OT: ObjectType> PartialOrd<OT> for FrameClock
impl<OT: ObjectType> PartialOrd<OT> for FrameClock
Source§impl StaticType for FrameClock
impl StaticType for FrameClock
Source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for FrameClock
Auto Trait Implementations§
impl Freeze for FrameClock
impl RefUnwindSafe for FrameClock
impl !Send for FrameClock
impl !Sync for FrameClock
impl Unpin for FrameClock
impl UnwindSafe for FrameClock
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on this object. Read moreSource§fn connect_local<F>(
&self,
signal_name: &str,
after: bool,
callback: F,
) -> SignalHandlerId
fn connect_local<F>( &self, signal_name: &str, after: bool, callback: F, ) -> SignalHandlerId
signal_name
on this object. Read moreSource§fn connect_local_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F,
) -> SignalHandlerId
fn connect_local_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F, ) -> SignalHandlerId
signal_id
on this object. Read moreSource§unsafe fn connect_unsafe<F>(
&self,
signal_name: &str,
after: bool,
callback: F,
) -> SignalHandlerId
unsafe fn connect_unsafe<F>( &self, signal_name: &str, after: bool, callback: F, ) -> SignalHandlerId
signal_name
on this object. Read moreSource§unsafe fn connect_unsafe_id<F>(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
callback: F,
) -> SignalHandlerId
unsafe fn connect_unsafe_id<F>( &self, signal_id: SignalId, details: Option<Quark>, after: bool, callback: F, ) -> SignalHandlerId
signal_id
on this object. Read moreSource§fn connect_closure(
&self,
signal_name: &str,
after: bool,
closure: RustClosure,
) -> SignalHandlerId
fn connect_closure( &self, signal_name: &str, after: bool, closure: RustClosure, ) -> SignalHandlerId
signal_name
on this object. Read moreSource§fn connect_closure_id(
&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
closure: RustClosure,
) -> SignalHandlerId
fn connect_closure_id( &self, signal_id: SignalId, details: Option<Quark>, after: bool, closure: RustClosure, ) -> SignalHandlerId
signal_id
on this object. Read moreSource§fn watch_closure(&self, closure: &impl AsRef<Closure>)
fn watch_closure(&self, closure: &impl AsRef<Closure>)
closure
to the lifetime of the object. When
the object’s reference count drops to zero, the closure will be
invalidated. An invalidated closure will ignore any calls to
invoke_with_values
, or
invoke
when using Rust closures.Source§fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
fn emit<R>(&self, signal_id: SignalId, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
Source§fn emit_with_values(&self, signal_id: SignalId, args: &[Value]) -> Option<Value>
fn emit_with_values(&self, signal_id: SignalId, args: &[Value]) -> Option<Value>
Self::emit
but takes Value
for the arguments.Source§fn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_by_name<R>(&self, signal_name: &str, args: &[&dyn ToValue]) -> Rwhere
R: TryFromClosureReturnValue,
Source§fn emit_by_name_with_values(
&self,
signal_name: &str,
args: &[Value],
) -> Option<Value>
fn emit_by_name_with_values( &self, signal_name: &str, args: &[Value], ) -> Option<Value>
Source§fn emit_by_name_with_details<R>(
&self,
signal_name: &str,
details: Quark,
args: &[&dyn ToValue],
) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_by_name_with_details<R>(
&self,
signal_name: &str,
details: Quark,
args: &[&dyn ToValue],
) -> Rwhere
R: TryFromClosureReturnValue,
Source§fn emit_by_name_with_details_and_values(
&self,
signal_name: &str,
details: Quark,
args: &[Value],
) -> Option<Value>
fn emit_by_name_with_details_and_values( &self, signal_name: &str, details: Quark, args: &[Value], ) -> Option<Value>
Source§fn emit_with_details<R>(
&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue],
) -> Rwhere
R: TryFromClosureReturnValue,
fn emit_with_details<R>(
&self,
signal_id: SignalId,
details: Quark,
args: &[&dyn ToValue],
) -> Rwhere
R: TryFromClosureReturnValue,
Source§fn emit_with_details_and_values(
&self,
signal_id: SignalId,
details: Quark,
args: &[Value],
) -> Option<Value>
fn emit_with_details_and_values( &self, signal_id: SignalId, details: Quark, args: &[Value], ) -> Option<Value>
Source§fn disconnect(&self, handler_id: SignalHandlerId)
fn disconnect(&self, handler_id: SignalHandlerId)
Source§fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
notify
signal of the object. Read moreSource§fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
fn connect_notify_local<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
notify
signal of the object. Read moreSource§unsafe fn connect_notify_unsafe<F>(
&self,
name: Option<&str>,
f: F,
) -> SignalHandlerId
unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F, ) -> SignalHandlerId
notify
signal of the object. Read more