chrome/browser/resources/print_preview/ui/copies_settings.ts

// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'chrome://resources/cr_elements/cr_checkbox/cr_checkbox.js';
import './number_settings_section.js';
import './print_preview_shared.css.js';

import {CrCheckboxElement} from 'chrome://resources/cr_elements/cr_checkbox/cr_checkbox.js';
import {loadTimeData} from 'chrome://resources/js/load_time_data.js';
import {PolymerElement} from 'chrome://resources/polymer/v3_0/polymer/polymer_bundled.min.js';

import {CopiesCapability} from '../data/cdd.js';

import {getTemplate} from './copies_settings.html.js';
import {SettingsMixin} from './settings_mixin.js';

/**
 * Maximum number of copies supported by the printer if not explicitly
 * specified.
 */
export const DEFAULT_MAX_COPIES: number = 999;

export interface PrintPreviewCopiesSettingsElement {
  $: {
    collate: CrCheckboxElement,
  };
}

const PrintPreviewCopiesSettingsElementBase = SettingsMixin(PolymerElement);

export class PrintPreviewCopiesSettingsElement extends
    PrintPreviewCopiesSettingsElementBase {
  static get is() {
    return 'print-preview-copies-settings';
  }

  static get template() {
    return getTemplate();
  }

  static get properties() {
    return {
      capability: Object,

      copiesMax_: {
        type: Number,
        computed: 'computeCopiesMax_(capability)',
      },

      currentValue_: {
        type: String,
        observer: 'onInputChanged_',
      },

      inputValid_: Boolean,

      disabled: Boolean,
    };
  }

  static get observers() {
    return ['onSettingsChanged_(settings.copies.value, settings.collate.*)'];
  }

  capability: CopiesCapability;
  disabled: boolean;
  private copiesMax_: number;
  private currentValue_: string;
  private inputValid_: boolean;

  /**
   * @return The maximum number of copies this printer supports.
   */
  private computeCopiesMax_(): number {
    return (this.capability && this.capability.max) ? this.capability.max :
                                                      DEFAULT_MAX_COPIES;
  }

  /**
   * @return The message to show as hint.
   */
  private getHintMessage_(): string {
    return loadTimeData.getStringF('copiesInstruction', this.copiesMax_);
  }

  /**
   * Updates the input string when the setting has been initialized.
   */
  private onSettingsChanged_() {
    const copies = this.getSetting('copies');
    if (this.inputValid_) {
      this.currentValue_ = (copies.value as number).toString();
    }
    const collate = this.getSetting('collate');
    this.$.collate.checked = collate.value as boolean;
  }

  /**
   * Updates model.copies and model.copiesInvalid based on the validity
   * and current value of the copies input.
   */
  private onInputChanged_() {
    if (this.currentValue_ !== '' &&
        this.currentValue_ !== this.getSettingValue('copies').toString()) {
      this.setSetting(
          'copies', this.inputValid_ ? parseInt(this.currentValue_, 10) : 1);
    }
    this.setSettingValid('copies', this.inputValid_);
  }

  /**
   * @return Whether collate checkbox should be hidden.
   */
  private collateHidden_(): boolean {
    return !this.getSetting('collate').available || !this.inputValid_ ||
        this.currentValue_ === '' || parseInt(this.currentValue_, 10) === 1;
  }

  private onCollateChange_() {
    this.setSetting('collate', this.$.collate.checked);
  }
}

declare global {
  interface HTMLElementTagNameMap {
    'print-preview-copies-settings': PrintPreviewCopiesSettingsElement;
  }
}

customElements.define(
    PrintPreviewCopiesSettingsElement.is, PrintPreviewCopiesSettingsElement);