118 lines
4.4 KiB
TypeScript
118 lines
4.4 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {AnimationAnimateMetadata, AnimationGroupMetadata, AnimationKeyframesSequenceMetadata, AnimationMetadata, AnimationSequenceMetadata, AnimationStateMetadata, AnimationStyleMetadata, AnimationTransitionMetadata, ɵStyleData} from '@angular/animations';
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import {copyStyles, normalizeStyles} from '../util';
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import {AnimationDslVisitor, visitAnimationNode} from './animation_dsl_visitor';
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import {parseTransitionExpr} from './animation_transition_expr';
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import {AnimationTransitionFactory} from './animation_transition_factory';
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import {AnimationTransitionInstruction, createTransitionInstruction} from './animation_transition_instruction';
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import {validateAnimationSequence} from './animation_validator_visitor';
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/**
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* @experimental Animation support is experimental.
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*/
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export function buildTrigger(name: string, definitions: AnimationMetadata[]): AnimationTrigger {
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return new AnimationTriggerVisitor().buildTrigger(name, definitions);
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}
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/**
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* @experimental Animation support is experimental.
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*/
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export class AnimationTrigger {
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public transitionFactories: AnimationTransitionFactory[] = [];
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public states: {[stateName: string]: ɵStyleData} = {};
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constructor(
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public name: string, states: {[stateName: string]: ɵStyleData},
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private _transitionAsts: AnimationTransitionMetadata[]) {
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Object.keys(states).forEach(
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stateName => { this.states[stateName] = copyStyles(states[stateName], false); });
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const errors: string[] = [];
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_transitionAsts.forEach(ast => {
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const exprs = parseTransitionExpr(ast.expr, errors);
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const sequenceErrors = validateAnimationSequence(ast);
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if (sequenceErrors.length) {
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errors.push(...sequenceErrors);
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} else {
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this.transitionFactories.push(
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new AnimationTransitionFactory(this.name, ast, exprs, states));
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}
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});
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if (errors.length) {
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const LINE_START = '\n - ';
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throw new Error(
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`Animation parsing for the ${name} trigger have failed:${LINE_START}${errors.join(LINE_START)}`);
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}
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}
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createFallbackInstruction(currentState: any, nextState: any): AnimationTransitionInstruction {
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const backupStateStyles = this.states['*'] || {};
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const currentStateStyles = this.states[currentState] || backupStateStyles;
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const nextStateStyles = this.states[nextState] || backupStateStyles;
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return createTransitionInstruction(
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this.name, currentState, nextState, nextState == 'void', currentStateStyles,
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nextStateStyles, []);
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}
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matchTransition(currentState: any, nextState: any): AnimationTransitionInstruction|null {
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for (let i = 0; i < this.transitionFactories.length; i++) {
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let result = this.transitionFactories[i].match(currentState, nextState);
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if (result) return result;
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}
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return null;
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}
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}
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class AnimationTriggerContext {
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public errors: string[] = [];
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public states: {[stateName: string]: ɵStyleData} = {};
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public transitions: AnimationTransitionMetadata[] = [];
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}
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class AnimationTriggerVisitor implements AnimationDslVisitor {
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buildTrigger(name: string, definitions: AnimationMetadata[]): AnimationTrigger {
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const context = new AnimationTriggerContext();
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definitions.forEach(def => visitAnimationNode(this, def, context));
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return new AnimationTrigger(name, context.states, context.transitions);
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}
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visitState(ast: AnimationStateMetadata, context: any): any {
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const styles = normalizeStyles(ast.styles.styles);
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ast.name.split(/\s*,\s*/).forEach(name => { context.states[name] = styles; });
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}
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visitTransition(ast: AnimationTransitionMetadata, context: any): any {
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context.transitions.push(ast);
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}
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visitSequence(ast: AnimationSequenceMetadata, context: any) {
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// these values are not visited in this AST
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}
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visitGroup(ast: AnimationGroupMetadata, context: any) {
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// these values are not visited in this AST
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}
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visitAnimate(ast: AnimationAnimateMetadata, context: any) {
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// these values are not visited in this AST
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}
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visitStyle(ast: AnimationStyleMetadata, context: any) {
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// these values are not visited in this AST
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}
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visitKeyframeSequence(ast: AnimationKeyframesSequenceMetadata, context: any) {
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// these values are not visited in this AST
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}
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}
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