@ux-aspects/ux-aspects
Version:
Open source user interface framework for building modern, responsive, mobile big data applications
101 lines • 16.3 kB
JavaScript
import { inject, Injectable } from '@angular/core';
import { Subject } from 'rxjs';
import { filter, takeUntil } from 'rxjs/operators';
import { DashboardService } from '../dashboard.service';
import * as i0 from "@angular/core";
export class DashboardGrabHandleService {
constructor() {
this._dashboard = inject(DashboardService);
/** Self-registered drag handles in the dashboard. */
this._handles = [];
/** Automatically unsubscribe from all observables when destroyed */
this._onDestroy = new Subject();
// if a drag is performed by the mouse we should update the focusable item to be the first again
this._dashboard.layout$.pipe(takeUntil(this._onDestroy), filter(() => !this._dashboard.isGrabbing$.value))
.subscribe(() => this.setFirstItemFocusable());
}
/** Perform unsubscriptions */
ngOnDestroy() {
this._onDestroy.next();
this._onDestroy.complete();
}
/** Register a new grab handle. */
addHandle(handle) {
this._handles = this.getHandlesInOrder([...this._handles, handle]);
// we want to make the first item focusable (raf to avoid expression changed error)
requestAnimationFrame(() => this.ensureFocusable());
}
/** Unregister a removed grab handle. */
removeHandle(handle) {
this._handles = this._handles.filter(h => h !== handle);
// Make sure there is still a focusable handle
this.ensureFocusable();
}
/** Make the first visual item in the list focusable */
setFirstItemFocusable() {
this.setItemFocus(0, false);
}
/** Set an item at a given index focused */
setItemFocus(index, focusElement = true) {
// if the list is empty then do nothing
if (!this._handles || this._handles.length === 0) {
return;
}
// check if the index is out of bounds
if (index < 0) {
return this.setItemFocus(0);
}
if (index > this._handles.length - 1) {
return this.setItemFocus(this._handles.length - 1);
}
// try focusing a specific index
this.getHandlesInOrder().forEach((handle, idx) => idx === index ? handle.focus(focusElement) : handle.blur());
// for safety we want to ensure one of the items is definitely still focusabled
this.ensureFocusable();
}
/** Focus the previous grab handle */
setPreviousItemFocus(handle) {
this.setItemFocus(this.getHandleIndex(handle) - 1);
}
/** Focus the next grab handle */
setNextItemFocus(handle) {
this.setItemFocus(this.getHandleIndex(handle) + 1);
}
/** Focus the grab handle on the widget above */
setSiblingItemFocus(widget, direction) {
// find all widgets that are directly above and have grab handles
const target = this._dashboard.getSurroundingWidgets(widget, direction)
.map(_widget => this._handles.find(handle => handle.widget === _widget))
.filter(handle => !!handle)
.reduce((handle, current) => !handle || current.widget.getColumn() > handle.widget.getColumn() ? current : handle, null);
// ensure we have a target before focusing
if (!target) {
return;
}
// get the index of the target handle
const index = this.getHandleIndex(target);
// focus the item
this.setItemFocus(index);
}
/** Get handles in the order they appear rather than the order they are in the DOM */
getHandlesInOrder(handles = this._handles) {
const widgets = this._dashboard.getWidgetsByOrder();
// sort the handles according to the position of the widget it belongs to
return handles.sort((handleOne, handleTwo) => widgets.indexOf(handleOne.widget) - widgets.indexOf(handleTwo.widget));
}
getHandleIndex(handle) {
return this.getHandlesInOrder().findIndex(_handle => _handle === handle);
}
/** If the current focusable handle is removed we need to make another one focusable */
ensureFocusable() {
if (!this._handles.find(handle => handle.tabIndex === 0)) {
this.setFirstItemFocusable();
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: DashboardGrabHandleService, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: DashboardGrabHandleService }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: DashboardGrabHandleService, decorators: [{
type: Injectable
}], ctorParameters: () => [] });
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{ inject, Injectable, OnDestroy } from '@angular/core';\nimport { Subject } from 'rxjs';\nimport { filter, takeUntil } from 'rxjs/operators';\nimport { ActionDirection, DashboardService } from '../dashboard.service';\nimport { DashboardWidgetComponent } from '../widget/dashboard-widget.component';\nimport { DashboardGrabHandleDirective } from './grab-handle.directive';\n\n@Injectable()\nexport class DashboardGrabHandleService implements OnDestroy {\n\n    private readonly _dashboard = inject(DashboardService);\n\n    /** Self-registered drag handles in the dashboard. */\n    private _handles: DashboardGrabHandleDirective[] = [];\n\n    /** Automatically unsubscribe from all observables when destroyed */\n    private readonly _onDestroy = new Subject<void>();\n\n    constructor() {\n\n        // if a drag is performed by the mouse we should update the focusable item to be the first again\n        this._dashboard.layout$.pipe(takeUntil(this._onDestroy), filter(() => !this._dashboard.isGrabbing$.value))\n            .subscribe(() => this.setFirstItemFocusable());\n    }\n\n    /** Perform unsubscriptions */\n    ngOnDestroy(): void {\n        this._onDestroy.next();\n        this._onDestroy.complete();\n    }\n\n    /** Register a new grab handle. */\n    addHandle(handle: DashboardGrabHandleDirective): void {\n        this._handles = this.getHandlesInOrder([...this._handles, handle]);\n\n        // we want to make the first item focusable (raf to avoid expression changed error)\n        requestAnimationFrame(() => this.ensureFocusable());\n    }\n\n    /** Unregister a removed grab handle. */\n    removeHandle(handle: DashboardGrabHandleDirective): void {\n        this._handles = this._handles.filter(h => h !== handle);\n\n        // Make sure there is still a focusable handle\n        this.ensureFocusable();\n    }\n\n    /** Make the first visual item in the list focusable */\n    setFirstItemFocusable(): void {\n        this.setItemFocus(0, false);\n    }\n\n    /** Set an item at a given index focused */\n    setItemFocus(index: number, focusElement: boolean = true): void {\n\n        // if the list is empty then do nothing\n        if (!this._handles || this._handles.length === 0) {\n            return;\n        }\n\n        // check if the index is out of bounds\n        if (index < 0) {\n            return this.setItemFocus(0);\n        }\n\n        if (index > this._handles.length - 1) {\n            return this.setItemFocus(this._handles.length - 1);\n        }\n\n        // try focusing a specific index\n        this.getHandlesInOrder().forEach((handle, idx) => idx === index ? handle.focus(focusElement) : handle.blur());\n\n        // for safety we want to ensure one of the items is definitely still focusabled\n        this.ensureFocusable();\n    }\n\n    /** Focus the previous grab handle */\n    setPreviousItemFocus(handle: DashboardGrabHandleDirective): void {\n        this.setItemFocus(this.getHandleIndex(handle) - 1);\n    }\n\n    /** Focus the next grab handle */\n    setNextItemFocus(handle: DashboardGrabHandleDirective): void {\n        this.setItemFocus(this.getHandleIndex(handle) + 1);\n    }\n\n    /** Focus the grab handle on the widget above */\n    setSiblingItemFocus(widget: DashboardWidgetComponent, direction: ActionDirection): void {\n\n        // find all widgets that are directly above and have grab handles\n        const target = this._dashboard.getSurroundingWidgets(widget, direction)\n            .map(_widget => this._handles.find(handle => handle.widget === _widget))\n            .filter(handle => !!handle)\n            .reduce((handle, current) => !handle || current.widget.getColumn() > handle.widget.getColumn() ? current : handle, null);\n\n        // ensure we have a target before focusing\n        if (!target) {\n            return;\n        }\n\n        // get the index of the target handle\n        const index = this.getHandleIndex(target);\n\n        // focus the item\n        this.setItemFocus(index);\n    }\n\n    /** Get handles in the order they appear rather than the order they are in the DOM */\n    getHandlesInOrder(handles = this._handles): DashboardGrabHandleDirective[] {\n        const widgets = this._dashboard.getWidgetsByOrder();\n\n        // sort the handles according to the position of the widget it belongs to\n        return handles.sort((handleOne, handleTwo) => widgets.indexOf(handleOne.widget) - widgets.indexOf(handleTwo.widget));\n    }\n\n    private getHandleIndex(handle: DashboardGrabHandleDirective): number {\n        return this.getHandlesInOrder().findIndex(_handle => _handle === handle);\n    }\n\n    /** If the current focusable handle is removed we need to make another one focusable */\n    private ensureFocusable(): void {\n        if (!this._handles.find(handle => handle.tabIndex === 0)) {\n            this.setFirstItemFocusable();\n        }\n    }\n\n}"]}