style: Support animation-direction.

This commit is contained in:
Emilio Cobos Álvarez 2016-06-22 19:24:25 +02:00
parent 9cf2e52d36
commit 33f581883b
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GPG key ID: 056B727BB9C1027C
2 changed files with 97 additions and 32 deletions

View file

@ -13,7 +13,7 @@ use script_layout_interface::restyle_damage::RestyleDamage;
use script_traits::{AnimationState, LayoutMsg as ConstellationMsg}; use script_traits::{AnimationState, LayoutMsg as ConstellationMsg};
use std::collections::HashMap; use std::collections::HashMap;
use std::sync::mpsc::Receiver; use std::sync::mpsc::Receiver;
use style::animation::{Animation, KeyframesIterationState, update_style_for_animation}; use style::animation::{Animation, update_style_for_animation};
use time; use time;
/// Processes any new animations that were discovered after style recalculation. /// Processes any new animations that were discovered after style recalculation.
@ -42,11 +42,11 @@ pub fn update_animation_state(constellation_chan: &IpcSender<ConstellationMsg>,
match *anim { match *anim {
Animation::Keyframes(_, _, ref mut anim_state) => { Animation::Keyframes(_, _, ref mut anim_state) => {
// NB: The important part is not touching // NB: The important part is not touching
// the started_at field. // the started_at field, since we don't want
anim_state.duration = state.duration; // to restart the animation.
anim_state.iteration_state = state.iteration_state.clone(); let old_started_at = anim_state.started_at;
anim_state.paused = state.paused; *anim_state = state.clone();
anim_state.delay = state.delay; anim_state.started_at = old_started_at;
false false
} }
_ => unreachable!(), _ => unreachable!(),
@ -84,18 +84,7 @@ pub fn update_animation_state(constellation_chan: &IpcSender<ConstellationMsg>,
Animation::Keyframes(_, _, ref mut state) => { Animation::Keyframes(_, _, ref mut state) => {
// This animation is still running, or we need to keep // This animation is still running, or we need to keep
// iterating. // iterating.
now < state.started_at + state.duration || now < state.started_at + state.duration || state.tick()
match state.iteration_state {
KeyframesIterationState::Finite(ref mut current, ref max) => {
*current += 1;
*current < *max
}
// Just tick it again.
KeyframesIterationState::Infinite => {
state.started_at += state.duration + state.delay;
true
}
}
} }
}; };

View file

@ -11,6 +11,7 @@ use dom::{OpaqueNode, TRestyleDamage};
use euclid::point::Point2D; use euclid::point::Point2D;
use keyframes::KeyframesStep; use keyframes::KeyframesStep;
use properties::animated_properties::{AnimatedProperty, TransitionProperty}; use properties::animated_properties::{AnimatedProperty, TransitionProperty};
use properties::longhands::animation_direction::computed_value::AnimationDirection;
use properties::longhands::animation_iteration_count::computed_value::AnimationIterationCount; use properties::longhands::animation_iteration_count::computed_value::AnimationIterationCount;
use properties::longhands::animation_play_state::computed_value::AnimationPlayState; use properties::longhands::animation_play_state::computed_value::AnimationPlayState;
use properties::longhands::transition_timing_function::computed_value::StartEnd; use properties::longhands::transition_timing_function::computed_value::StartEnd;
@ -42,11 +43,55 @@ pub enum KeyframesIterationState {
// TODO: unify the use of f32/f64 in this file. // TODO: unify the use of f32/f64 in this file.
#[derive(Debug, Clone)] #[derive(Debug, Clone)]
pub struct KeyframesAnimationState { pub struct KeyframesAnimationState {
/// The time this animation started at.
pub started_at: f64, pub started_at: f64,
/// The duration of this animation.
pub duration: f64, pub duration: f64,
/// The delay of the animation.
pub delay: f64, pub delay: f64,
/// The current iteration state for the animation.
pub iteration_state: KeyframesIterationState, pub iteration_state: KeyframesIterationState,
/// Werther this animation is paused.
pub paused: bool, pub paused: bool,
/// The declared animation direction of this animation.
pub direction: AnimationDirection,
/// The current animation direction. This can only be `normal` or `reverse`.
pub current_direction: AnimationDirection,
}
impl KeyframesAnimationState {
/// Performs a tick in the animation state, i.e., increments the counter of
/// the current iteration count, updates times and then toggles the
/// direction if appropriate.
///
/// Returns true if the animation should keep running.
pub fn tick(&mut self) -> bool {
let still_running = match self.iteration_state {
KeyframesIterationState::Finite(ref mut current, ref max) => {
*current += 1;
*current < *max
}
KeyframesIterationState::Infinite => true,
};
// Just tick it again updating the started_at field.
self.started_at += self.duration + self.delay;
// Update the next iteration direction if applicable.
match self.direction {
AnimationDirection::alternate |
AnimationDirection::alternate_reverse => {
self.current_direction = match self.current_direction {
AnimationDirection::normal => AnimationDirection::reverse,
AnimationDirection::reverse => AnimationDirection::normal,
_ => unreachable!(),
};
}
_ => {},
}
still_running
}
} }
/// State relating to an animation. /// State relating to an animation.
@ -287,6 +332,16 @@ pub fn maybe_start_animations<Impl: SelectorImplExt>(context: &SharedStyleContex
AnimationIterationCount::Infinite => KeyframesIterationState::Infinite, AnimationIterationCount::Infinite => KeyframesIterationState::Infinite,
AnimationIterationCount::Number(n) => KeyframesIterationState::Finite(0, n), AnimationIterationCount::Number(n) => KeyframesIterationState::Finite(0, n),
}; };
let animation_direction = *box_style.animation_direction.0.get_mod(i);
let initial_direction = match animation_direction {
AnimationDirection::normal |
AnimationDirection::alternate => AnimationDirection::normal,
AnimationDirection::reverse |
AnimationDirection::alternate_reverse => AnimationDirection::reverse,
};
let paused = *box_style.animation_play_state.0.get_mod(i) == AnimationPlayState::paused; let paused = *box_style.animation_play_state.0.get_mod(i) == AnimationPlayState::paused;
context.new_animations_sender context.new_animations_sender
@ -297,6 +352,8 @@ pub fn maybe_start_animations<Impl: SelectorImplExt>(context: &SharedStyleContex
delay: delay as f64, delay: delay as f64,
iteration_state: iteration_state, iteration_state: iteration_state,
paused: paused, paused: paused,
direction: animation_direction,
current_direction: initial_direction,
})).unwrap(); })).unwrap();
had_animations = true; had_animations = true;
} }
@ -393,20 +450,31 @@ where Impl: SelectorImplExt,
debug!("update_style_for_animation: anim \"{}\", steps: {:?}, state: {:?}, progress: {}", debug!("update_style_for_animation: anim \"{}\", steps: {:?}, state: {:?}, progress: {}",
name, animation.steps, state, total_progress); name, animation.steps, state, total_progress);
let mut last_keyframe_position = None; // Get the target and the last keyframe position.
let mut target_keyframe_position = None; let last_keyframe_position;
let target_keyframe_position;
match state.current_direction {
AnimationDirection::normal => {
target_keyframe_position =
animation.steps.iter().position(|step| {
total_progress as f32 <= step.start_percentage.0
});
// TODO: we could maybe binary-search this? Also, find is probably a last_keyframe_position = target_keyframe_position.and_then(|pos| {
// bit more idiomatic here? if pos != 0 { Some(pos - 1) } else { None }
for i in 0..animation.steps.len() { });
if total_progress as f32 <= animation.steps[i].start_percentage.0 {
// We might have found our current keyframe.
target_keyframe_position = Some(i);
if i != 0 {
last_keyframe_position = Some(i - 1);
}
break;
} }
AnimationDirection::reverse => {
target_keyframe_position =
animation.steps.iter().rev().position(|step| {
total_progress as f32 <= 1. - step.start_percentage.0
}).map(|pos| animation.steps.len() - pos - 1);
last_keyframe_position = target_keyframe_position.and_then(|pos| {
if pos != animation.steps.len() - 1 { Some(pos + 1) } else { None }
});
}
_ => unreachable!(),
} }
debug!("update_style_for_animation: keyframe from {:?} to {:?}", debug!("update_style_for_animation: keyframe from {:?} to {:?}",
@ -432,9 +500,17 @@ where Impl: SelectorImplExt,
} }
}; };
let relative_timespan = target_keyframe.start_percentage.0 - last_keyframe.start_percentage.0; let relative_timespan = (target_keyframe.start_percentage.0 - last_keyframe.start_percentage.0).abs();
let relative_duration = relative_timespan as f64 * duration; let relative_duration = relative_timespan as f64 * duration;
let last_keyframe_ended_at = state.started_at + (total_duration * last_keyframe.start_percentage.0 as f64); let last_keyframe_ended_at = match state.current_direction {
AnimationDirection::normal => {
state.started_at + (total_duration * last_keyframe.start_percentage.0 as f64)
}
AnimationDirection::reverse => {
state.started_at + (total_duration * (1. - last_keyframe.start_percentage.0 as f64))
}
_ => unreachable!(),
};
let relative_progress = (now - last_keyframe_ended_at) / relative_duration; let relative_progress = (now - last_keyframe_ended_at) / relative_duration;
// TODO: How could we optimise it? Is it such a big deal? // TODO: How could we optimise it? Is it such a big deal?