@ux-aspects/ux-aspects
Version:
Open source user interface framework for building modern, responsive, mobile big data applications
103 lines • 14.5 kB
JavaScript
import { DOWN_ARROW, LEFT_ARROW, RIGHT_ARROW, UP_ARROW } from '@angular/cdk/keycodes';
import { Injectable } from '@angular/core';
import { BehaviorSubject, Subject } from 'rxjs';
import * as i0 from "@angular/core";
export class SankeyFocusManager {
constructor() {
/** Store the node that can currently be tabbed to */
this.active$ = new BehaviorSubject(null);
/** Emit whenever an item should receive focus */
this.focused$ = new Subject();
/** Store the nodes */
this._nodes = [];
}
/** Get the current active item */
get _active() {
return this.active$.value;
}
ngOnDestroy() {
this.active$.complete();
this.focused$.complete();
}
/** Update the list of possible nodes */
setNodes(nodes) {
this._nodes = nodes;
// check if there is currently a tabbable node, if not we should make the first node tabbable
if (!this.hasActiveNode()) {
this.setActiveItem(this._nodes[0]);
}
}
/** Set the current active item */
setActiveItem(node) {
this.active$.next(node);
}
/** Handle keyboard input from nodes */
onKeydown(event) {
switch (event.which) {
case UP_ARROW:
this.shiftFocusVertically(-1);
event.preventDefault();
break;
case DOWN_ARROW:
this.shiftFocusVertically(1);
event.preventDefault();
break;
case LEFT_ARROW:
this.shiftFocusHorizontally(-1);
event.preventDefault();
break;
case RIGHT_ARROW:
this.shiftFocusHorizontally(1);
event.preventDefault();
break;
}
}
setFocusedItem(item) {
this.setActiveItem(item);
this.focused$.next(item);
}
shiftFocusVertically(delta) {
const nodes = this.getNodesInColumn(this._active.column);
// get the node below or above the active node
const target = nodes[nodes.findIndex(node => node.node.id === this._active.node.id) + delta];
if (target) {
this.setFocusedItem(target);
}
}
/** Shift the focus to a node in a sibling column */
shiftFocusHorizontally(delta) {
// get nodes in the sibling column in the desired direction
const nodes = this.getNodesInColumn(this._active.column + delta);
// if there are no nodes then do nothing as we cannot reduce an empty array
if (nodes.length === 0) {
return;
}
// get the node with the most similar y position
const target = nodes.reduce((closest, node) => {
const closestDiff = Math.max(closest.y, this._active.y) - Math.min(closest.y, this._active.y);
const currentDiff = Math.max(node.y, this._active.y) - Math.min(node.y, this._active.y);
return closestDiff < currentDiff ? closest : node;
});
if (target) {
this.setFocusedItem(target);
}
}
/** Get a list of nodes that are in a given column */
getNodesInColumn(column) {
return this.getNodesInOrder(this._nodes.filter(node => node.column === column));
}
/** Sort the nodes based on the Y position */
getNodesInOrder(nodes) {
return [...nodes].sort((nodeOne, nodeTwo) => nodeOne.y - nodeTwo.y);
}
/** Determine whether or not there is a not that is tabbable */
hasActiveNode() {
return !!this.active$.value && !!this._nodes.find(node => node.node.id === this.active$.value.node.id);
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: SankeyFocusManager, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: SankeyFocusManager }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: SankeyFocusManager, decorators: [{
type: Injectable
}] });
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{ DOWN_ARROW, LEFT_ARROW, RIGHT_ARROW, UP_ARROW } from '@angular/cdk/keycodes';\nimport { Injectable, OnDestroy } from '@angular/core';\nimport { BehaviorSubject, Subject } from 'rxjs';\nimport { SankeyNodeLink } from './interfaces/node-link.interface';\n\n@Injectable()\nexport class SankeyFocusManager<T> implements OnDestroy {\n\n    /** Store the node that can currently be tabbed to */\n    active$ = new BehaviorSubject<SankeyNodeLink<T>>(null);\n\n    /** Emit whenever an item should receive focus */\n    focused$ = new Subject<SankeyNodeLink<T>>();\n\n    /** Store the nodes  */\n    private _nodes: ReadonlyArray<SankeyNodeLink<T>> = [];\n\n    /** Get the current active item */\n    private get _active(): SankeyNodeLink<T> {\n        return this.active$.value;\n    }\n\n    ngOnDestroy(): void {\n        this.active$.complete();\n        this.focused$.complete();\n    }\n\n    /** Update the list of possible nodes */\n    setNodes(nodes: ReadonlyArray<SankeyNodeLink<T>>): void {\n        this._nodes = nodes;\n\n        // check if there is currently a tabbable node, if not we should make the first node tabbable\n        if (!this.hasActiveNode()) {\n            this.setActiveItem(this._nodes[0]);\n        }\n    }\n\n    /** Set the current active item */\n    setActiveItem(node: SankeyNodeLink<T>): void {\n        this.active$.next(node);\n    }\n\n    /** Handle keyboard input from nodes */\n    onKeydown(event: KeyboardEvent): void {\n\n        switch (event.which) {\n            case UP_ARROW:\n                this.shiftFocusVertically(-1);\n                event.preventDefault();\n                break;\n\n            case DOWN_ARROW:\n                this.shiftFocusVertically(1);\n                event.preventDefault();\n                break;\n\n            case LEFT_ARROW:\n                this.shiftFocusHorizontally(-1);\n                event.preventDefault();\n                break;\n\n            case RIGHT_ARROW:\n                this.shiftFocusHorizontally(1);\n                event.preventDefault();\n                break;\n        }\n    }\n\n    private setFocusedItem(item: SankeyNodeLink<T>): void {\n        this.setActiveItem(item);\n        this.focused$.next(item);\n    }\n\n    private shiftFocusVertically(delta: number): void {\n        const nodes = this.getNodesInColumn(this._active.column);\n\n        // get the node below or above the active node\n        const target = nodes[nodes.findIndex(node => node.node.id === this._active.node.id) + delta];\n\n        if (target) {\n            this.setFocusedItem(target);\n        }\n    }\n\n    /** Shift the focus to a node in a sibling column */\n    private shiftFocusHorizontally(delta: number): void {\n\n        // get nodes in the sibling column in the desired direction\n        const nodes = this.getNodesInColumn(this._active.column + delta);\n\n        // if there are no nodes then do nothing as we cannot reduce an empty array\n        if (nodes.length === 0) {\n            return;\n        }\n\n        // get the node with the most similar y position\n        const target = nodes.reduce((closest, node) => {\n            const closestDiff = Math.max(closest.y, this._active.y) - Math.min(closest.y, this._active.y);\n            const currentDiff = Math.max(node.y, this._active.y) - Math.min(node.y, this._active.y);\n            return closestDiff < currentDiff ? closest : node;\n        });\n\n        if (target) {\n            this.setFocusedItem(target);\n        }\n    }\n\n    /** Get a list of nodes that are in a given column */\n    private getNodesInColumn(column: number): ReadonlyArray<SankeyNodeLink<T>> {\n        return this.getNodesInOrder(this._nodes.filter(node => node.column === column));\n    }\n\n    /** Sort the nodes based on the Y position */\n    private getNodesInOrder(nodes: ReadonlyArray<SankeyNodeLink<T>>): ReadonlyArray<SankeyNodeLink<T>> {\n        return [...nodes].sort((nodeOne, nodeTwo) => nodeOne.y - nodeTwo.y);\n    }\n\n    /** Determine whether or not there is a not that is tabbable */\n    private hasActiveNode(): boolean {\n        return !!this.active$.value && !!this._nodes.find(node => node.node.id === this.active$.value.node.id);\n    }\n\n}\n"]}