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Code Issues Releases Wiki Activity

improve transition performance

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This commit is contained in:
Rich Harris 2017-06-24 16:42:59 -04:00
parent 9b4550d2e8
commit 71f1ac91ba
1 changed files with 56 additions and 28 deletions
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84
src/shared/transitions.js
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@ -4,37 +4,31 @@ export function linear(t) {
return t;
}
export function generateKeyframes(
export function generateRule(
a,
b,
delta,
duration,
ease,
fn,
node,
style
fn
) {
var id = '__svelte' + ~~(Math.random() * 1e9); // TODO make this more robust
var keyframes = '@keyframes ' + id + '{\n';
var keyframes = '{\n';
for (var p = 0; p <= 1; p += 16.666 / duration) {
var t = a + delta * ease(p);
keyframes += p * 100 + '%{' + fn(t) + '}\n';
}
keyframes += '100% {' + fn(b) + '}\n}';
style.textContent += keyframes;
return keyframes + '100% {' + fn(b) + '}\n}';
}
document.head.appendChild(style);
// https://github.com/darkskyapp/string-hash/blob/master/index.js
export function hash(str) {
var hash = 5381;
var i = str.length;
node.style.animation = (node.style.animation || '')
.split(',')
.filter(function(anim) {
// when introing, discard old animations if there are any
return anim && (delta < 0 || !/__svelte/.test(anim));
})
.concat(id + ' ' + duration + 'ms linear 1 forwards')
.join(', ');
while (i--) hash = (hash * 33) ^ str.charCodeAt(i);
return hash >>> 0;
}
export function wrapTransition(node, fn, params, intro, outgroup) {
@ -43,9 +37,10 @@ export function wrapTransition(node, fn, params, intro, outgroup) {
var ease = obj.easing || linear;
var cssText;
// TODO share <style> tag between all transitions?
if (obj.css) {
if (obj.css && !transitionManager.stylesheet) {
var style = document.createElement('style');
document.head.appendChild(style);
transitionManager.stylesheet = style.sheet;
}
if (intro) {
@ -89,16 +84,26 @@ export function wrapTransition(node, fn, params, intro, outgroup) {
if (obj.css) {
if (obj.delay) node.style.cssText = cssText;
generateKeyframes(
program.rule = generateRule(
program.a,
program.b,
program.delta,
program.duration,
ease,
obj.css,
node,
style
obj.css
);
transitionManager.addRule(program.rule, program.name = '__svelte_' + hash(program.rule));
node.style.animation = (node.style.animation || '')
.split(', ')
.filter(function(anim) {
// when introing, discard old animations if there are any
return anim && (program.delta < 0 || !/__svelte/.test(anim));
})
.concat(program.name + ' ' + duration + 'ms linear 1 forwards')
.join(', ');
}
this.program = program;
@ -113,16 +118,17 @@ export function wrapTransition(node, fn, params, intro, outgroup) {
if (obj.tick) obj.tick(this.t);
},
done: function() {
this.t = this.program.b;
var program = this.program;
this.t = program.b;
if (obj.tick) obj.tick(this.t);
if (obj.css) document.head.removeChild(style);
this.program.callback();
this.program = null;
if (obj.css) transitionManager.deleteRule(node, program.name);
program.callback();
program = null;
this.running = !!this.pending;
},
abort: function() {
if (obj.tick) obj.tick(1);
if (obj.css) document.head.removeChild(style);
if (obj.css) transitionManager.deleteRule(node, this.program.name);
this.program = this.pending = null;
this.running = false;
}
@ -133,6 +139,8 @@ export var transitionManager = {
running: false,
transitions: [],
bound: null,
stylesheet: null,
activeRules: {},
add: function(transition) {
this.transitions.push(transition);
@ -143,6 +151,13 @@ export var transitionManager = {
}
},
addRule: function(rule, name) {
if (!this.activeRules[name]) {
this.activeRules[name] = true;
this.stylesheet.insertRule('@keyframes ' + name + ' ' + rule, this.stylesheet.cssRules.length);
}
},
next: function() {
this.running = false;
@ -170,6 +185,19 @@ export var transitionManager = {
if (this.running) {
requestAnimationFrame(this.bound || (this.bound = this.next.bind(this)));
} else if (this.stylesheet) {
var i = this.stylesheet.cssRules.length;
while (i--) this.stylesheet.deleteRule(i);
this.activeRules = {};
}
},
deleteRule: function(node, name) {
node.style.animation = node.style.animation
.split(', ')
.filter(function(anim) {
return anim.slice(0, name.length) !== name;
})
.join(', ');
}
};