@clr/angular
Version:
Angular components for Clarity
155 lines • 15.5 kB
JavaScript
/*
* Copyright (c) 2016-2023 VMware, Inc. All Rights Reserved.
* This software is released under MIT license.
* The full license information can be found in LICENSE in the root directory of this project.
*/
import { Injectable } from '@angular/core';
import { Subject } from 'rxjs';
import * as i0 from "@angular/core";
import * as i1 from "./state-debouncer.provider";
export class Page {
constructor(stateDebouncer) {
this.stateDebouncer = stateDebouncer;
this.activated = false;
/**
* Page size, a value of 0 means no pagination
*/
this._size = 0;
/**
* Current page
*/
this._current = 1;
/**
* The Observable that lets other classes subscribe to page changes
*/
this._change = new Subject();
this.preventEmit = false;
this._sizeChange = new Subject();
}
get size() {
return this._size;
}
set size(size) {
const oldSize = this._size;
if (size !== oldSize) {
if (!this.preventEmit) {
this.stateDebouncer.changeStart();
}
this._size = size;
if (size === 0) {
this._current = 1;
}
else {
// Yeap. That's the formula to keep the first item from the old page still
// displayed in the new one.
this._current = Math.floor((oldSize / size) * (this._current - 1)) + 1;
}
// We always emit an event even if the current page index didn't change, because
// the size changing means the items inside the page are different
if (!this.preventEmit) {
this._change.next(this._current);
this._sizeChange.next(this._size);
this.stateDebouncer.changeDone();
}
}
this.preventEmit = false;
}
get totalItems() {
return this._totalItems || 0; // remains 0 if not set to avoid breaking change
}
set totalItems(total) {
this._totalItems = total;
// If we have less items than before, we might need to change the current page
if (this.current > this.last) {
this.current = this.last;
}
}
get last() {
if (this._last) {
return this._last;
}
// If the last page isn't known, we compute it from the last item's index
if (this.size > 0 && this.totalItems) {
return Math.ceil(this.totalItems / this.size);
}
return 1;
}
set last(page) {
this._last = page;
}
// We do not want to expose the Subject itself, but the Observable which is read-only
get change() {
return this._change.asObservable();
}
get sizeChange() {
return this._sizeChange.asObservable();
}
get current() {
return this._current;
}
set current(page) {
if (page !== this._current) {
this.stateDebouncer.changeStart();
this._current = page;
this._change.next(page);
this.stateDebouncer.changeDone();
}
}
/**
* Index of the first item displayed on the current page, starting at 0, -1 if none displayed
*/
get firstItem() {
if (this._totalItems === 0) {
return -1;
}
if (this.size === 0) {
return 0;
}
return (this.current - 1) * this.size;
}
/**
* Index of the last item displayed on the current page, starting at 0, -1 if none displayed
*/
get lastItem() {
if (this._totalItems === 0) {
return -1;
}
if (this.size === 0) {
return this.totalItems - 1;
}
let lastInPage = this.current * this.size - 1;
if (this.totalItems) {
lastInPage = Math.min(lastInPage, this.totalItems - 1);
}
return lastInPage;
}
/**
* Moves to the previous page if it exists
*/
previous() {
if (this.current > 1) {
this.current--;
}
}
/**
* Moves to the next page if it exists
*/
next() {
if (this.current < this.last) {
this.current++;
}
}
/**
* Resets the page size to 0
*/
resetPageSize(preventEmit = false) {
this.preventEmit = preventEmit;
this.size = 0;
}
}
Page.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.2.2", ngImport: i0, type: Page, deps: [{ token: i1.StateDebouncer }], target: i0.ɵɵFactoryTarget.Injectable });
Page.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "15.2.2", ngImport: i0, type: Page });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.2.2", ngImport: i0, type: Page, decorators: [{
type: Injectable
}], ctorParameters: function () { return [{ type: i1.StateDebouncer }]; } });
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All Rights Reserved.\n * This software is released under MIT license.\n * The full license information can be found in LICENSE in the root directory of this project.\n */\n\nimport { Injectable } from '@angular/core';\nimport { Observable } from 'rxjs';\nimport { Subject } from 'rxjs';\n\nimport { StateDebouncer } from './state-debouncer.provider';\n\n@Injectable()\nexport class Page {\n  activated = false;\n\n  /**\n   * Page size, a value of 0 means no pagination\n   */\n  private _size = 0;\n\n  /**\n   * Total items (needed to guess the last page)\n   */\n  private _totalItems?: number;\n\n  /**\n   * Last page\n   */\n  private _last: number;\n\n  /**\n   * Current page\n   */\n  private _current = 1;\n\n  /**\n   * The Observable that lets other classes subscribe to page changes\n   */\n  private _change = new Subject<number>();\n\n  private preventEmit = false;\n  private _sizeChange = new Subject<number>();\n\n  constructor(private stateDebouncer: StateDebouncer) {}\n\n  get size(): number {\n    return this._size;\n  }\n  set size(size: number) {\n    const oldSize = this._size;\n    if (size !== oldSize) {\n      if (!this.preventEmit) {\n        this.stateDebouncer.changeStart();\n      }\n      this._size = size;\n      if (size === 0) {\n        this._current = 1;\n      } else {\n        // Yeap. That's the formula to keep the first item from the old page still\n        // displayed in the new one.\n        this._current = Math.floor((oldSize / size) * (this._current - 1)) + 1;\n      }\n      // We always emit an event even if the current page index didn't change, because\n      // the size changing means the items inside the page are different\n      if (!this.preventEmit) {\n        this._change.next(this._current);\n        this._sizeChange.next(this._size);\n        this.stateDebouncer.changeDone();\n      }\n    }\n    this.preventEmit = false;\n  }\n\n  get totalItems(): number {\n    return this._totalItems || 0; // remains 0 if not set to avoid breaking change\n  }\n  set totalItems(total: number) {\n    this._totalItems = total;\n    // If we have less items than before, we might need to change the current page\n    if (this.current > this.last) {\n      this.current = this.last;\n    }\n  }\n\n  get last(): number {\n    if (this._last) {\n      return this._last;\n    }\n    // If the last page isn't known, we compute it from the last item's index\n    if (this.size > 0 && this.totalItems) {\n      return Math.ceil(this.totalItems / this.size);\n    }\n    return 1;\n  }\n  set last(page: number) {\n    this._last = page;\n  }\n\n  // We do not want to expose the Subject itself, but the Observable which is read-only\n  get change(): Observable<number> {\n    return this._change.asObservable();\n  }\n\n  get sizeChange(): Observable<number> {\n    return this._sizeChange.asObservable();\n  }\n\n  get current(): number {\n    return this._current;\n  }\n  set current(page: number) {\n    if (page !== this._current) {\n      this.stateDebouncer.changeStart();\n      this._current = page;\n      this._change.next(page);\n      this.stateDebouncer.changeDone();\n    }\n  }\n\n  /**\n   * Index of the first item displayed on the current page, starting at 0, -1 if none displayed\n   */\n  get firstItem(): number {\n    if (this._totalItems === 0) {\n      return -1;\n    }\n\n    if (this.size === 0) {\n      return 0;\n    }\n    return (this.current - 1) * this.size;\n  }\n\n  /**\n   * Index of the last item displayed on the current page, starting at 0, -1 if none displayed\n   */\n  get lastItem(): number {\n    if (this._totalItems === 0) {\n      return -1;\n    }\n\n    if (this.size === 0) {\n      return this.totalItems - 1;\n    }\n    let lastInPage = this.current * this.size - 1;\n    if (this.totalItems) {\n      lastInPage = Math.min(lastInPage, this.totalItems - 1);\n    }\n    return lastInPage;\n  }\n\n  /**\n   * Moves to the previous page if it exists\n   */\n  previous() {\n    if (this.current > 1) {\n      this.current--;\n    }\n  }\n\n  /**\n   * Moves to the next page if it exists\n   */\n  next() {\n    if (this.current < this.last) {\n      this.current++;\n    }\n  }\n\n  /**\n   * Resets the page size to 0\n   */\n  resetPageSize(preventEmit = false): void {\n    this.preventEmit = preventEmit;\n    this.size = 0;\n  }\n}\n"]}