blockly/core/toolbox/category.ts

/**
 * @license
 * Copyright 2020 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * A toolbox category used to organize blocks in the toolbox.
 *
 * @class
 */
// Former goog.module ID: Blockly.ToolboxCategory

import * as Css from '../css.js';
import type {ICollapsibleToolboxItem} from '../interfaces/i_collapsible_toolbox_item.js';
import type {ISelectableToolboxItem} from '../interfaces/i_selectable_toolbox_item.js';
import type {IToolbox} from '../interfaces/i_toolbox.js';
import type {IToolboxItem} from '../interfaces/i_toolbox_item.js';
import * as registry from '../registry.js';
import * as aria from '../utils/aria.js';
import * as colourUtils from '../utils/colour.js';
import * as dom from '../utils/dom.js';
import * as parsing from '../utils/parsing.js';
import type {
  CategoryInfo,
  DynamicCategoryInfo,
  FlyoutDefinition,
  FlyoutItemInfo,
  FlyoutItemInfoArray,
  StaticCategoryInfo,
} from '../utils/toolbox.js';
import * as toolbox from '../utils/toolbox.js';
import {Toolbox} from './toolbox.js';
import {ToolboxItem} from './toolbox_item.js';

/**
 * Class for a category in a toolbox.
 */
export class ToolboxCategory
  extends ToolboxItem
  implements ISelectableToolboxItem
{
  /** Name used for registering a toolbox category. */
  static registrationName = 'category';

  /** The number of pixels to move the category over at each nested level. */
  static nestedPadding = 19;

  /** The width in pixels of the strip of colour next to each category. */
  static borderWidth = 8;

  /**
   * The default colour of the category. This is used as the background colour
   * of the category when it is selected.
   */
  static defaultBackgroundColour = '#57e';

  // TODO(b/109816955): remove '!', see go/strict-prop-init-fix.
  override toolboxItemDef_!: CategoryInfo;

  /** The name that will be displayed on the category. */
  protected name_ = '';

  /** The colour of the category. */
  protected colour_ = '';

  /** The HTML container for the category. */
  protected htmlDiv_: HTMLDivElement | null = null;

  /** The HTML element for the category row. */
  protected rowDiv_: HTMLDivElement | null = null;

  /** The HTML element that holds children elements of the category row. */
  protected rowContents_: HTMLDivElement | null = null;

  /** The HTML element for the toolbox icon. */
  protected iconDom_: Element | null = null;

  /** The HTML element for the toolbox label. */
  protected labelDom_: Element | null = null;
  protected cssConfig_: CssConfig;

  /** True if the category is meant to be hidden, false otherwise. */
  protected isHidden_ = false;

  /** True if this category is disabled, false otherwise. */
  protected isDisabled_ = false;

  /** The flyout items for this category. */
  protected flyoutItems_: string | FlyoutItemInfoArray = [];

  /**
   * @param categoryDef The information needed to create a category in the
   *     toolbox.
   * @param parentToolbox The parent toolbox for the category.
   * @param opt_parent The parent category or null if the category does not have
   *     a parent.
   */
  constructor(
    categoryDef: CategoryInfo,
    parentToolbox: IToolbox,
    opt_parent?: ICollapsibleToolboxItem,
  ) {
    super(categoryDef, parentToolbox, opt_parent);

    /** All the css class names that are used to create a category. */
    this.cssConfig_ = this.makeDefaultCssConfig_();
  }

  /**
   * Initializes the toolbox item.
   * This includes creating the DOM and updating the state of any items based
   * on the info object.
   * Init should be called immediately after the construction of the toolbox
   * item, to ensure that the category contents are properly parsed.
   */
  override init() {
    this.parseCategoryDef_(this.toolboxItemDef_);
    this.parseContents_(this.toolboxItemDef_);
    this.createDom_();
    if (this.toolboxItemDef_['hidden'] === 'true') {
      this.hide();
    }
  }

  /**
   * Creates an object holding the default classes for a category.
   *
   * @returns The configuration object holding all the CSS classes for a
   *     category.
   */
  protected makeDefaultCssConfig_(): CssConfig {
    return {
      'container': 'blocklyToolboxCategoryContainer',
      'row': 'blocklyToolboxCategory',
      'rowcontentcontainer': 'blocklyTreeRowContentContainer',
      'icon': 'blocklyToolboxCategoryIcon',
      'label': 'blocklyToolboxCategoryLabel',
      'contents': 'blocklyToolboxCategoryGroup',
      'selected': 'blocklyToolboxSelected',
      'openicon': 'blocklyToolboxCategoryIconOpen',
      'closedicon': 'blocklyToolboxCategoryIconClosed',
    };
  }

  /**
   * Parses the contents array depending on if the category is a dynamic
   * category, or if its contents are meant to be shown in the flyout.
   *
   * @param categoryDef The information needed to create a category.
   */
  protected parseContents_(categoryDef: CategoryInfo) {
    if ('custom' in categoryDef) {
      this.flyoutItems_ = categoryDef['custom'];
    } else {
      const contents = categoryDef['contents'];
      if (!contents) return;

      for (let i = 0; i < contents.length; i++) {
        const itemDef = contents[i];
        const flyoutItem = itemDef as FlyoutItemInfo;
        if (Array.isArray(this.flyoutItems_)) {
          this.flyoutItems_.push(flyoutItem);
        }
      }
    }
  }

  /**
   * Parses the non-contents parts of the category def.
   *
   * @param categoryDef The information needed to create a category.
   */
  protected parseCategoryDef_(categoryDef: CategoryInfo) {
    this.name_ =
      'name' in categoryDef
        ? parsing.replaceMessageReferences(categoryDef['name'])
        : '';
    this.colour_ = this.getColour_(categoryDef);
    Object.assign(
      this.cssConfig_,
      categoryDef['cssconfig'] || (categoryDef as any)['cssConfig'],
    );
  }

  /**
   * Creates the DOM for the category.
   *
   * @returns The parent element for the category.
   */
  protected createDom_(): HTMLDivElement {
    this.htmlDiv_ = this.createContainer_();
    aria.setRole(this.htmlDiv_, aria.Role.TREEITEM);
    aria.setState(this.htmlDiv_, aria.State.SELECTED, false);
    aria.setState(this.htmlDiv_, aria.State.LEVEL, this.level_ + 1);
    (this.parentToolbox_ as Toolbox).recomputeAriaOwners();

    this.rowDiv_ = this.createRowContainer_();
    this.rowDiv_.style.pointerEvents = 'auto';
    this.htmlDiv_.appendChild(this.rowDiv_);

    this.rowContents_ = this.createRowContentsContainer_();
    this.rowContents_.style.pointerEvents = 'none';
    this.rowDiv_.appendChild(this.rowContents_);

    this.iconDom_ = this.createIconDom_();
    aria.setRole(this.iconDom_, aria.Role.PRESENTATION);
    this.rowContents_.appendChild(this.iconDom_);

    this.labelDom_ = this.createLabelDom_(this.name_);
    this.rowContents_.appendChild(this.labelDom_);

    const id = this.labelDom_.getAttribute('id');
    if (id) {
      aria.setState(this.htmlDiv_, aria.State.LABELLEDBY, id);
    }

    this.addColourBorder_(this.colour_);

    return this.htmlDiv_;
  }

  /**
   * Creates the container that holds the row and any subcategories.
   *
   * @returns The div that holds the icon and the label.
   */
  protected createContainer_(): HTMLDivElement {
    const container = document.createElement('div');
    // Ensure that the category has a tab index to ensure it receives focus when
    // clicked (since clicking isn't managed by the toolbox).
    container.tabIndex = -1;
    container.id = this.getId();
    const className = this.cssConfig_['container'];
    if (className) {
      dom.addClass(container, className);
    }
    return container;
  }

  /**
   * Creates the parent of the contents container. All clicks will happen on
   * this div.
   *
   * @returns The div that holds the contents container.
   */
  protected createRowContainer_(): HTMLDivElement {
    const rowDiv = document.createElement('div');
    const className = this.cssConfig_['row'];
    if (className) {
      dom.addClass(rowDiv, className);
    }
    const nestedPadding = `${
      ToolboxCategory.nestedPadding * this.getLevel()
    }px`;
    if (this.workspace_.RTL) {
      rowDiv.style.paddingRight = nestedPadding;
    } else {
      rowDiv.style.paddingLeft = nestedPadding;
    }
    return rowDiv;
  }

  /**
   * Creates the container for the label and icon.
   * This is necessary so we can set all subcategory pointer events to none.
   *
   * @returns The div that holds the icon and the label.
   */
  protected createRowContentsContainer_(): HTMLDivElement {
    const contentsContainer = document.createElement('div');
    const className = this.cssConfig_['rowcontentcontainer'];
    if (className) {
      dom.addClass(contentsContainer, className);
    }
    return contentsContainer;
  }

  /**
   * Creates the span that holds the category icon.
   *
   * @returns The span that holds the category icon.
   */
  protected createIconDom_(): Element {
    const toolboxIcon = document.createElement('span');
    if (!this.parentToolbox_.isHorizontal()) {
      const className = this.cssConfig_['icon'];
      if (className) {
        dom.addClass(toolboxIcon, className);
      }
    }

    toolboxIcon.style.display = 'inline-block';
    return toolboxIcon;
  }

  /**
   * Creates the span that holds the category label.
   * This should have an ID for accessibility purposes.
   *
   * @param name The name of the category.
   * @returns The span that holds the category label.
   */
  protected createLabelDom_(name: string): Element {
    const toolboxLabel = document.createElement('span');
    toolboxLabel.setAttribute('id', this.getId() + '.label');
    toolboxLabel.textContent = name;
    const className = this.cssConfig_['label'];
    if (className) {
      dom.addClass(toolboxLabel, className);
    }
    return toolboxLabel;
  }

  /** Updates the colour for this category. */
  refreshTheme() {
    this.colour_ = this.getColour_(this.toolboxItemDef_);
    this.addColourBorder_(this.colour_);
  }

  /**
   * Add the strip of colour to the toolbox category.
   *
   * @param colour The category colour.
   */
  protected addColourBorder_(colour: string) {
    if (colour) {
      const border =
        ToolboxCategory.borderWidth + 'px solid ' + (colour || '#ddd');
      if (this.workspace_.RTL) {
        this.rowDiv_!.style.borderRight = border;
      } else {
        this.rowDiv_!.style.borderLeft = border;
      }
    }
  }

  /**
   * Gets either the colour or the style for a category.
   *
   * @param categoryDef The object holding information on the category.
   * @returns The hex colour for the category.
   */
  protected getColour_(categoryDef: CategoryInfo): string {
    const styleName =
      categoryDef['categorystyle'] || (categoryDef as any)['categoryStyle'];
    const colour = categoryDef['colour'];

    if (colour && styleName) {
      console.warn(
        'Toolbox category "' +
          this.name_ +
          '" must not have both a style and a colour',
      );
    } else if (styleName) {
      return this.getColourfromStyle(styleName);
    } else if (colour) {
      return this.parseColour(colour);
    }
    return '';
  }

  /**
   * Sets the colour for the category using the style name and returns the new
   * colour as a hex string.
   *
   * @param styleName Name of the style.
   * @returns The hex colour for the category.
   */
  private getColourfromStyle(styleName: string): string {
    const theme = this.workspace_.getTheme();
    if (styleName && theme) {
      const style = theme.categoryStyles[styleName];
      if (style && style.colour) {
        return this.parseColour(style.colour);
      } else {
        console.warn(
          'Style "' + styleName + '" must exist and contain a colour value',
        );
      }
    }
    return '';
  }

  /**
   * Gets the HTML element that is clickable.
   * The parent toolbox element receives clicks. The parent toolbox will add an
   * ID to this element so it can pass the onClick event to the correct
   * toolboxItem.
   *
   * @returns The HTML element that receives clicks.
   */
  override getClickTarget(): Element {
    return this.rowDiv_ as Element;
  }

  /**
   * Parses the colour on the category.
   *
   * @param colourValue HSV hue value (0 to 360), #RRGGBB string, or a message
   *     reference string pointing to one of those two values.
   * @returns The hex colour for the category.
   */
  private parseColour(colourValue: number | string): string {
    // Decode the colour for any potential message references
    // (eg. `%{BKY_MATH_HUE}`).
    const colour = parsing.replaceMessageReferences(colourValue);
    if (colour == null || colour === '') {
      // No attribute. No colour.
      return '';
    } else {
      const hue = Number(colour);
      if (!isNaN(hue)) {
        return colourUtils.hueToHex(hue);
      } else {
        const hex = colourUtils.parse(colour);
        if (hex) {
          return hex;
        } else {
          console.warn(
            'Toolbox category "' +
              this.name_ +
              '" has unrecognized colour attribute: ' +
              colour,
          );
          return '';
        }
      }
    }
  }

  /**
   * Adds appropriate classes to display an open icon.
   *
   * @param iconDiv The div that holds the icon.
   */
  protected openIcon_(iconDiv: Element | null) {
    if (!iconDiv) {
      return;
    }
    const closedIconClass = this.cssConfig_['closedicon'];
    if (closedIconClass) {
      dom.removeClasses(iconDiv, closedIconClass);
    }
    const className = this.cssConfig_['openicon'];
    if (className) {
      dom.addClass(iconDiv, className);
    }
  }

  /**
   * Adds appropriate classes to display a closed icon.
   *
   * @param iconDiv The div that holds the icon.
   */
  protected closeIcon_(iconDiv: Element | null) {
    if (!iconDiv) {
      return;
    }
    const openIconClass = this.cssConfig_['openicon'];
    if (openIconClass) {
      dom.removeClasses(iconDiv, openIconClass);
    }
    const className = this.cssConfig_['closedicon'];
    if (className) {
      dom.addClass(iconDiv, className);
    }
  }

  /**
   * Sets whether the category is visible or not.
   * For a category to be visible its parent category must also be expanded.
   *
   * @param isVisible True if category should be visible.
   */
  override setVisible_(isVisible: boolean) {
    this.htmlDiv_!.style.display = isVisible ? 'block' : 'none';
    this.isHidden_ = !isVisible;

    if (this.parentToolbox_.getSelectedItem() === this) {
      this.parentToolbox_.clearSelection();
    }
  }

  /** Hide the category. */
  hide() {
    this.setVisible_(false);
  }

  /**
   * Show the category. Category will only appear if its parent category is also
   * expanded.
   */
  show() {
    this.setVisible_(true);
  }

  /**
   * Whether the category is visible.
   * A category is only visible if all of its ancestors are expanded and
   * isHidden_ is false.
   *
   * @returns True if the category is visible, false otherwise.
   */
  isVisible(): boolean {
    return !this.isHidden_ && this.allAncestorsExpanded_();
  }

  /**
   * Whether all ancestors of a category (parent and parent's parent, etc.) are
   * expanded.
   *
   * @returns True only if every ancestor is expanded
   */
  protected allAncestorsExpanded_(): boolean {
    /* eslint-disable-next-line @typescript-eslint/no-this-alias */
    let category: IToolboxItem = this;
    while (category.getParent()) {
      category = category.getParent()!;
      if (!(category as ICollapsibleToolboxItem).isExpanded()) {
        return false;
      }
    }
    return true;
  }

  override isSelectable() {
    return this.isVisible() && !this.isDisabled_;
  }

  /**
   * Handles when the toolbox item is clicked.
   *
   * @param _e Click event to handle.
   */
  onClick(_e: Event) {}
  // No-op

  /**
   * Sets the current category as selected.
   *
   * @param isSelected True if this category is selected, false otherwise.
   */
  setSelected(isSelected: boolean) {
    if (!this.rowDiv_) {
      return;
    }
    const className = this.cssConfig_['selected'];
    if (isSelected) {
      const defaultColour = this.parseColour(
        ToolboxCategory.defaultBackgroundColour,
      );
      this.rowDiv_.style.backgroundColor = this.colour_ || defaultColour;
      if (className) {
        dom.addClass(this.rowDiv_, className);
      }
    } else {
      this.rowDiv_.style.backgroundColor = '';
      if (className) {
        dom.removeClass(this.rowDiv_, className);
      }
    }
    aria.setState(this.htmlDiv_ as Element, aria.State.SELECTED, isSelected);
  }

  /**
   * Sets whether the category is disabled.
   *
   * @param isDisabled True to disable the category, false otherwise.
   */
  setDisabled(isDisabled: boolean) {
    this.isDisabled_ = isDisabled;
    this.getDiv()!.setAttribute('disabled', `${isDisabled}`);
    if (isDisabled) {
      this.getDiv()!.setAttribute('disabled', 'true');
    } else {
      this.getDiv()!.removeAttribute('disabled');
    }
  }

  /**
   * Gets the name of the category. Used for emitting events.
   *
   * @returns The name of the toolbox item.
   */
  getName(): string {
    return this.name_;
  }

  override getParent() {
    return this.parent_;
  }

  override getDiv() {
    return this.htmlDiv_;
  }

  /**
   * Gets the contents of the category. These are items that are meant to be
   * displayed in the flyout.
   *
   * @returns The definition of items to be displayed in the flyout.
   */
  getContents(): FlyoutItemInfoArray | string {
    return this.flyoutItems_;
  }

  /**
   * Updates the contents to be displayed in the flyout.
   * If the flyout is open when the contents are updated, refreshSelection on
   * the toolbox must also be called.
   *
   * @param contents The contents to be displayed in the flyout. A string can be
   *     supplied to create a dynamic category.
   */
  updateFlyoutContents(contents: FlyoutDefinition | string) {
    this.flyoutItems_ = [];

    if (typeof contents === 'string') {
      const newDefinition: DynamicCategoryInfo = {
        kind: this.toolboxItemDef_.kind,
        custom: contents,
        id: this.toolboxItemDef_.id,
        categorystyle: this.toolboxItemDef_.categorystyle,
        colour: this.toolboxItemDef_.colour,
        cssconfig: this.toolboxItemDef_.cssconfig,
        hidden: this.toolboxItemDef_.hidden,
      };
      this.toolboxItemDef_ = newDefinition;
    } else {
      const newDefinition: StaticCategoryInfo = {
        kind: this.toolboxItemDef_.kind,
        name:
          'name' in this.toolboxItemDef_ ? this.toolboxItemDef_['name'] : '',
        contents: toolbox.convertFlyoutDefToJsonArray(contents),
        id: this.toolboxItemDef_.id,
        categorystyle: this.toolboxItemDef_.categorystyle,
        colour: this.toolboxItemDef_.colour,
        cssconfig: this.toolboxItemDef_.cssconfig,
        hidden: this.toolboxItemDef_.hidden,
      };
      this.toolboxItemDef_ = newDefinition;
    }
    this.parseContents_(this.toolboxItemDef_);
  }

  override dispose() {
    dom.removeNode(this.htmlDiv_);
  }
}

export namespace ToolboxCategory {
  /** All the CSS class names that are used to create a category. */
  export interface CssConfig {
    container?: string;
    row?: string;
    rowcontentcontainer?: string;
    icon?: string;
    label?: string;
    contents?: string;
    selected?: string;
    openicon?: string;
    closedicon?: string;
  }
}

export type CssConfig = ToolboxCategory.CssConfig;

/** CSS for Toolbox.  See css.js for use. */
Css.register(`
.blocklyToolboxCategory:not(.blocklyToolboxSelected):hover {
  background-color: rgba(255, 255, 255, .2);
}

.blocklyToolbox[layout="h"] .blocklyToolboxCategoryContainer {
  margin: 1px 5px 1px 0;
}

.blocklyToolbox[dir="RTL"][layout="h"] .blocklyToolboxCategoryContainer {
  margin: 1px 0 1px 5px;
}

.blocklyToolboxCategory {
  height: 22px;
  line-height: 22px;
  margin-bottom: 3px;
  padding-right: 8px;
  white-space: nowrap;
}

.blocklyToolbox[dir="RTL"] .blocklyToolboxCategory {
  margin-left: 8px;
  padding-right: 0;
}

.blocklyToolboxCategoryIcon {
  background-image: url(<<<PATH>>>/sprites.png);
  height: 16px;
  vertical-align: middle;
  visibility: hidden;
  width: 16px;
}

.blocklyToolboxCategoryIconClosed {
  background-position: -32px -1px;
}

.blocklyToolbox[dir="RTL"] .blocklyToolboxCategoryIconClosed {
  background-position: 0 -1px;
}

.blocklyToolboxSelected>.blocklyToolboxCategoryIconClosed {
  background-position: -32px -17px;
}

.blocklyToolbox[dir="RTL"] .blocklyToolboxSelected>.blocklyToolboxCategoryIconClosed {
  background-position: 0 -17px;
}

.blocklyToolboxCategoryIconOpen {
  background-position: -16px -1px;
}

.blocklyToolboxSelected>.blocklyToolboxCategoryIconOpen {
  background-position: -16px -17px;
}

.blocklyToolboxCategoryLabel {
  cursor: default;
  font: 16px sans-serif;
  padding: 0 3px;
  vertical-align: middle;
}

.blocklyToolboxDelete .blocklyToolboxCategoryLabel {
  cursor: url("<<<PATH>>>/handdelete.cur"), auto;
}

.blocklyToolboxSelected .blocklyToolboxCategoryLabel {
  color: #fff;
}
`);

registry.register(
  registry.Type.TOOLBOX_ITEM,
  ToolboxCategory.registrationName,
  ToolboxCategory,
);