asset_card.js

/**
 * @license
 * Copyright 2016 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


/**
 * Creates and contains an MDL card that presents info about the given asset.
 * @final
 */
class AssetCard {
  /**
   * @param {!Element} parentDiv
   * @param {!ShakaDemoAssetInfo} asset
   * @param {boolean} isFeatured True if this card should use the "featured"
   *   style, which use the asset's short name and have descriptions.
   * @param {function(!AssetCard)} remakeButtonsFn
   */
  constructor(parentDiv, asset, isFeatured, remakeButtonsFn) {
    /** @private {!Element} */
    this.card_ = document.createElement('div');
    /** @private {!ShakaDemoAssetInfo} */
    this.asset_ = asset;
    /** @private {!Element} */
    this.actions_ = document.createElement('div');
    /** @private {!Element} */
    this.featureIconsContainer_ = document.createElement('div');
    /** @private {!Element} */
    this.progressBar_ = document.createElement('progress');
    /** @private {function(!AssetCard)} */
    this.remakeButtonsFn_ = remakeButtonsFn;

    // Lay out the card.
    this.card_.classList.add('mdl-card-wide');
    this.card_.classList.add('mdl-card');
    this.card_.classList.add('mdl-shadow--2dp');
    this.card_.classList.add('asset-card');

    const titleDiv = document.createElement('div');
    titleDiv.classList.add('mdl-card__title');
    this.card_.appendChild(titleDiv);
    const titleText = document.createElement('h2');
    titleText.classList.add('mdl-card__title-text');
    titleText.textContent = asset.shortName || asset.name;
    titleDiv.appendChild(titleText);

    if (asset.iconUri) {
      const img = document.createElement('img');
      img.src = asset.iconUri;
      img.alt = '';  // Not necessary to understand the page
      this.card_.appendChild(img);
    }

    if (asset.description && isFeatured) {
      const supportingText = document.createElement('div');
      supportingText.classList.add('mdl-card__supporting-text');
      supportingText.textContent = asset.description;
      this.card_.appendChild(supportingText);
    }

    this.card_.appendChild(this.featureIconsContainer_);
    this.addFeatureIcons_(asset);

    this.actions_.classList.add('mdl-card__actions');
    this.actions_.classList.add('mdl-card--border');
    this.card_.appendChild(this.actions_);
    this.remakeButtons();

    const progressContainer = document.createElement('div');
    this.progressBar_.classList.add('hidden');
    this.progressBar_.setAttribute('max', 1);
    this.progressBar_.setAttribute('value', asset.storedProgress);
    progressContainer.appendChild(this.progressBar_);
    this.card_.appendChild(progressContainer);

    parentDiv.appendChild(this.card_);
  }

  /**
   * @param {string} icon
   * @param {string} title
   * @private
   */
  addFeatureIcon_(icon, title) {
    const iconDiv = document.createElement('div');
    iconDiv.classList.add('feature-icon');
    iconDiv.setAttribute('icon', icon);
    this.featureIconsContainer_.appendChild(iconDiv);

    ShakaDemoTooltips.make(this.featureIconsContainer_, iconDiv, title);
  }

  /**
   * @param {!ShakaDemoAssetInfo} asset
   * @private
   */
  addFeatureIcons_(asset) {
    const Feature = shakaAssets.Feature;
    const KeySystem = shakaAssets.KeySystem;

    const icons = new Map()
        .set(Feature.SUBTITLES, 'subtitles')
        .set(Feature.CAPTIONS, 'closed_caption')
        .set(Feature.LIVE, 'live')
        .set(Feature.TRICK_MODE, 'trick_mode')
        .set(Feature.HIGH_DEFINITION, 'high_definition')
        .set(Feature.ULTRA_HIGH_DEFINITION, 'ultra_high_definition')
        .set(Feature.SURROUND, 'surround_sound')
        .set(Feature.MULTIPLE_LANGUAGES, 'multiple_languages')
        .set(Feature.AUDIO_ONLY, 'audio_only');

    for (const feature of asset.features) {
      const icon = icons.get(feature);
      if (icon) {
        this.addFeatureIcon_(icon, feature);
      }
    }

    for (const drm of asset.drm) {
      switch (drm) {
        case KeySystem.WIDEVINE:
          this.addFeatureIcon_('widevine', 'Widevine DRM');
          break;
        case KeySystem.CLEAR_KEY:
          this.addFeatureIcon_('clear_key', 'Clear Key DRM');
          break;
        case KeySystem.PLAYREADY:
          this.addFeatureIcon_('playready', 'PlayReady DRM');
          break;
      }
    }
  }

  /**
   * Modify an asset to make it clear that it is unsupported.
   * @param {?string} unsupportedReason
   */
  markAsUnsupported(unsupportedReason) {
    this.card_.classList.add('asset-card-unsupported');
    this.makeUnsupportedButton_('Not Available', unsupportedReason);
  }

  /**
   * Make a button that represents the lack of a working button.
   * @param {string} buttonName
   * @param {?string} unsupportedReason
   * @private
   */
  makeUnsupportedButton_(buttonName, unsupportedReason) {
    const button = this.addButton(buttonName, () => {});
    button.setAttribute('disabled', '');

    // Place the tooltip into the parent container of the card, so that the
    // tooltip won't be clipped by other asset cards.
    // Also, tooltips don't work on disabled buttons (on some platforms), so
    // the button itself has to be "uprooted" and placed in a synthetic div
    // specifically to attach the tooltip to.
    const tooltipContainer = this.card_.parentElement;
    if (tooltipContainer && unsupportedReason) {
      const attachPoint = document.createElement('div');
      if (button.parentElement) {
        button.parentElement.removeChild(button);
      }
      attachPoint.classList.add('tooltip-attach-point');
      attachPoint.appendChild(button);
      this.actions_.appendChild(attachPoint);
      ShakaDemoTooltips.make(tooltipContainer, attachPoint, unsupportedReason);
    }
  }

  /**
   * Select this card if the card's asset matches |asset|.
   * Used to simplify the implementation of "shaka-main-selected-asset-changed"
   * handlers.
   * @param {ShakaDemoAssetInfo} asset
   */
  selectByAsset(asset) {
    this.card_.classList.remove('selected');
    if (this.asset_ == asset) {
      this.card_.classList.add('selected');
    }
  }

  /** Remake the buttons of the card. */
  remakeButtons() {
    shaka.ui.Utils.removeAllChildren(this.actions_);
    this.remakeButtonsFn_(this);
  }

  /**
   * Adds a button to the bottom of the card that controls storage behavior.
   * This is a separate function because it involves a significant amount of
   * custom behavior, such as the download bar.
   */
  addStoreButton() {
    const unsupportedReason = shakaDemoMain.getAssetUnsupportedReason(
        this.asset_, /* needOffline= */ true);
    if (unsupportedReason || !this.asset_.storeCallback) {
      // This can't be stored.
      this.makeUnsupportedButton_('Download', unsupportedReason);
      return;
    }
    if (this.asset_.isStored()) {
      const deleteButton = this.addButton('Delete', async () => {
        deleteButton.disabled = true;
        await this.asset_.unstoreCallback();
        this.remakeButtons();
      });
    } else {
      const downloadButton = this.addButton('Download', async () => {
        downloadButton.disabled = true;
        await this.asset_.storeCallback();
        this.remakeButtons();
      });
    }
  }

  /**
   * Updates the progress bar on the card.
   */
  updateProgress() {
    if (this.asset_.storedProgress < 1) {
      this.progressBar_.classList.remove('hidden');
      for (const button of this.actions_.childNodes) {
        button.disabled = true;
      }
    } else {
      this.progressBar_.classList.add('hidden');
      for (const button of this.actions_.childNodes) {
        button.disabled = false;
      }
    }
    this.progressBar_.setAttribute('value', this.asset_.storedProgress);
  }

  /**
   * Adds a button to the bottom of the card that will call |onClick| when
   * clicked. For example, a play or delete button.
   * @param {string} name
   * @param {function()} onclick
   * @return {!Element}
   */
  addButton(name, onclick) {
    const button = document.createElement('button');
    button.classList.add('mdl-button');
    button.classList.add('mdl-button--colored');
    button.classList.add('mdl-js-button');
    button.classList.add('mdl-js-ripple-effect');
    button.textContent = name;
    button.addEventListener('click', () => {
      if (!button.hasAttribute('disabled')) {
        onclick();
      }
    });
    this.actions_.appendChild(button);
    return button;
  }
}