shaka-player/ui/less/containers.less

/** @license
 * Shaka Player
 * Copyright 2016 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

/* All of the top-level containers into which various visible features go. */

@transparent: rgba(0, 0, 0, 0);

/* A container for the entire video + controls combo.  This is the auto-setup
 * div which we populate. */
.shaka-video-container {
  .overlay-parent();

  /* Without this, the container somehow winds up being a tad taller than it
   * should be (484px vs 480px). */
  display: flex;

  /* Set a special font for material design icons. */
  .material-icons-round {
    font-family: 'Material Icons Round';
    font-size: 24px;
  }

  /* Set the fonts for all other content. */
  * {
    font-family: Roboto-Regular, Roboto, sans-serif;
  }
}

/* Each browser has a different prefixed pseudo-class for fullscreened elements.
 * Define the properties of a fullscreened element in a mixin, then apply to
 * each of the browser-specific pseudo-classes.
 * NOTE: These fullscreen pseudo-classes can't be combined with commas into a
 * single delcaration.  Browsers ignore the rest of the list once they hit one
 * pseudo-class they don't support. */
.fullscreen-container() {
  .fill-container();

  background-color: black;

  .shaka-text-container {
    /* In fullscreen mode, the text displayer's font size should be relative to
     * the either window height or width (whichever is smaller), instead of a
     * fixed size. */
    font-size: 4.4vmin;
  }
}
.shaka-video-container:fullscreen { .fullscreen-container(); }
.shaka-video-container:-webkit-full-screen { .fullscreen-container(); }
.shaka-video-container:-moz-full-screen { .fullscreen-container(); }
.shaka-video-container:-ms-fullscreen { .fullscreen-container(); }

/* The actual video element.  Sits inside .shaka-video-container and gives it a
 * size in non-fullscreen mode.  In fullscreen mode, the sizing relationship
 * flips.  CSS is just great like that.  :-( */
.shaka-video {
  /* At the moment, nothing special is required here.
   * Note that this should NOT be an overlay-child, as its size could dictate
   * the size of the container for some applications. */
}

/* A container for all controls, including the giant play button, seek bar, etc.
 * Sits inside .shaka-video-container, on top of (Z axis) .shaka-video, and
 * below (Y axis) .shaka-play-button-container. */
.shaka-controls-container {
  .overlay-child();

  .hide-when-shaka-controls-disabled();

  /* Without this, the controls container overflows the video container. */
  box-sizing: border-box;

  /* A flex container, to make layout of children easier to reason about. */
  display: flex;

  /* Defines in which direction the children should flow. */
  flex-direction: column;

  /* Pushes the children toward the bottom of the container. */
  justify-content: flex-end;

  /* Centers children horizontally. */
  align-items: center;

  /* By default, do not allow any of our controls to shrink.
   * Specific controls can use .shrinkable() to override. */
  * { .unshrinkable(); }

  /* Position the controls container in front of the text container, so that
   * the text container doesn't interfere with the control buttons. */
  z-index: 1;

  &[casting="true"] {
    /* Hide fullscreen button while casting. */
    .shaka-fullscreen-button {
      .hidden();
    }
  }
}

/* Container for controls positioned at the bottom of the video container:
 * controls button panel and the seek bar. */
.shaka-bottom-controls {
  width: @bottom-controls-width;
  padding: 0;
  padding-bottom: 2.5%;

  /* Position the bottom panel in front of other controls (play button and
   * spinner containers).
   * TODO: A different layout arrangement might be a better solution for this.
   * Need to experiment.
   */
  z-index: 1;
}

/* This is the container for the horizontal row of controls above the seek bar.
 * It sits above (Y axis) the seek bar, and below (Y axis) the giant play button
 * in the middle. */
.shaka-controls-button-panel {
  /* Fill the space horizontally, with no extra padding or margin. */
  padding: 0;
  margin: 0;

  /* This is itself a flex container, with children layed out horizontally. */
  display: flex;
  flex-direction: row;

  /* Push children to the right. */
  justify-content: flex-end;

  /* Center children vertically. */
  align-items: center;

  /* TODO: Document why. */
  overflow: hidden;
  min-width: 48px;

  /* Make sure we don't inherit odd font sizes and styles from the environment.
   * TODO: When did this happen?  What forced us to do this? */
  font-size: 12px;
  font-weight: normal;
  font-style: normal;

  /* Make sure contents cannot be selected. */
  .unselectable();

  .show-when-controls-shown();

  /* All buttons, divs, and other controls directly inside this panel should
   * have these characteristics by default. */
  & > * {
    /* White text or button icons. */
    color: white;

    /* 32px tall controls. */
    height: 32px;

    /* Consistent margins (external) and padding (internal) between controls. */
    .bottom-panels-elements-margin();

    padding: 0;

    /* Transparent backgrounds, no borders, and a pointer when you mouse over
     * them. */
    background: transparent;
    border: 0;
    cursor: pointer;
  }
}

/* The container for the giant play button.  Sits above (Y axis) the
 * other video controls and seek bar, in the middle of the video frame, on top
 * of (Z axis) the video. */
.shaka-play-button-container {
  /* Take up as much space as possible, but shrink (vertically) to accomodate
   * the controls at the bottom. */
  margin: 0;
  .fill-container();
  .shrinkable();
  .absolute-position();

  /* Keep the play button in the middle of this container. */
  display: flex;
  justify-content: center;
  align-items: center;
}

.shaka-scrim-container {
  margin: 0;
  .fill-container();
  .shrinkable();
  .absolute-position();
  .show-when-controls-shown();

  /* A black gradient at the bottom, behind the controls, but only so high. */
  background: linear-gradient(to top, rgba(0, 0, 0, 1) 0, @transparent 15%);
}

.shaka-text-container {
  .absolute-position();

  bottom: 0%;
  width: 100%;
  min-width: 48px;
  text-align: center;

  /* When the controls fade in or out, it takes 600ms. Thus, when the text
   * container adjusts to the presence or absence of controls, we should wait
   * briefly, so the captions don't end up appearing behind the controls.
   * Instead of being a gradual animation, this is a fast animation with a
   * significant delay, since the captions moving around is a little
   * distracting. */
  transition: bottom cubic-bezier(0.4, 0, 0.6, 1) 100ms;
  transition-delay: 500ms;

  /* Set the captions in the middle horizontally by default. */
  display: flex;
  flex-direction: column;
  align-items: center;

  /* Set the captions at the bottom by default. */
  justify-content: flex-end;

  /* These are defaults which are overridden by JS or cue styles. */
  font-size: 20px;
  line-height: 1.4;  // relative to font size.

  /* This makes nested elements have this specific font size, too.  Without
   * this, defaults at the app level for generic elements like <p> may be
   * specific enough to override font size for those elements in captions. */
  * {
    font-size: 20px;
    line-height: 1.4;  // relative to font size.
  }

  span {
    /* These are defaults which are overridden by JS or cue styles. */
    background-color: rgba(0, 0, 0, 0.8);
    color: rgb(255, 255, 255);
    display: inline-block;
  }

  .shaka-nested-cue:not(:last-of-type):after {
    content: " ";
    white-space: pre;
  }
}

.shaka-controls-container[shown="true"] ~ .shaka-text-container {
  /* While the controls are shown, the text container should avoid the 15%
   * at the bottom of the video, to avoid overlapping with controls. */
  bottom: 15%;

  /* Disable the transition delay when moving the captions up, so that the
   * controls don't appear over the captions. */
  transition-delay: 0ms;
}

/* The buffering spinner. */
.shaka-spinner-container {
  .absolute-position();
  .fill-container();
  .hide-when-shaka-controls-disabled();

  flex-shrink: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

@spinner-size-percentage: 15.6%;

.shaka-spinner {
  /* This uses the same trickery as the big play button define
  the spinner's width and height. See .shaka-play-button
  for the detailed explanation. */

  /* For the padding thing to work, spinner div needs to be an
  overlay-parent and spinner svg - an overlay child. */
  .overlay-parent();

  margin: 0;
  box-sizing: border-box;
  padding: @spinner-size-percentage / 2;
  width: 0;
  height: 0;

  /* Add a bit of a white shadow to keep our black spinner visible
  on a black background. */
  filter: drop-shadow(0 0 2px rgba(255, 255, 255, 0.5));
}