BotFramework-WebChat/packages/component/src/Transcript/TranscriptFocus/TranscriptFocus.module.css at 721513d8fbbc7c1447781c2c2bd66f3daf451bf5 · microsoft/BotFramework-WebChat · GitHub

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/* Focus area container */

:global(.webchat) .transcript-focus-area {
  display: grid;
  grid-template-areas: 'content';
  outline: 0;

  --webchat__transcript--spacing: 10px;

  .transcript-focus-area__indicator,
  .transcript-focus-area__transcript-indicator {
    box-sizing: border-box;
    font-size: 0;
    grid-area: content;
    isolation: isolate;
    min-height: 0;
    pointer-events: none;
  }

  .transcript-focus-area__root,
  .transcript-focus-area__content-root {
    grid-area: content;
    min-height: 0;
    min-width: 0;
  }

  &:focus
    .transcript-focus-area__content--focused
    > .transcript-focus-area__content-overlay
    .transcript-focus-area__indicator {
    border-color: var(--webchat__color--transcript-activity-visual-keyboard-indicator);
    border-style: var(--webchat__border-style--transcript-activity-visual-keyboard-indicator);
    border-width: var(--webchat__border-width--transcript-activity-visual-keyboard-indicator);
    inset: calc(var(--webchat__transcript--spacing) / -2) calc(var(--webchat__transcript--spacing) / 2)
      calc(var(--webchat__transcript--spacing) / -2) calc(var(--webchat__transcript--spacing) / 2);
    position: absolute;
  }

  &:focus-visible .transcript-focus-area__transcript-indicator,
  .transcript-focus-area__root:has(.transcript-focus-area__terminator:focus-visible)
    + .transcript-focus-area__transcript-indicator {
    border-color: var(--webchat__border-color--transcript-visual-keyboard-indicator);
    border-style: var(--webchat__border-style--transcript-visual-keyboard-indicator);
    border-width: var(--webchat__border-width--transcript-visual-keyboard-indicator);
  }

  .transcript-focus-area__activity-list {
    display: grid;
    gap: var(--webchat__transcript--spacing);
    padding-block: var(--webchat__transcript--spacing);
  }

  .transcript-focus-area__content {
    display: grid;
    grid-template-areas: 'content';
    min-height: 0;
    min-width: 0;

    > * {
      grid-area: content;
      min-width: 0;
    }
  }

  /*
    TODO: see if we can remove the wrapper along with absolute/relative positioning by:
    - Using intersection observer to observe a given activity is in the view
    - Supplying the edge we'd like the focus indicator to align with

    Browser handles differently both bounding boxes and scroll into view for static vs relative/absolute positioning.
    To account for the differences, we use absolute/relative positioning as the rest of our code assumes so.
  */
  .transcript-focus-area__content-overlay {
    min-height: 0;
    grid-area: content;
    /* The bounding box is expanded to both top and bottom to scroll focus indicator into view. */
    /* We should ignore clicks to make sure this expansion don't register click as focus. */
    /* Otherwise, when clicking on the very bottom edge of the activity, it will focus on next activity instead. */
    pointer-events: none;
    position: relative;
    width: 100%;
  }

  /* When the content is focused as active descendant, scrollIntoView() will scroll this invisible div into view. */
  .transcript-focus-area__content-active-descendant {
    inset: calc(var(--webchat__transcript--spacing) / -1) 0 calc(var(--webchat__transcript--spacing) / -1) 0;
    position: absolute;
  }

  .transcript-focus-area__terminator {
    height: 0;
    outline: 0;
    position: relative;
    width: 100%;
  }

  .transcript-focus-area__terminator-body {
    display: flex;
    inset: auto 0 0 0;
    justify-content: center;
    position: absolute;
  }

  .transcript-focus-area__terminator:not(:focus) .transcript-focus-area__terminator-body {
    display: none;
  }

  .transcript-focus-area__terminator-text {
    background: var(--webchat__background--transcript-terminator);
    border-radius: var(--webchat__border-radius--transcript-terminator);
    color: var(--webchat__color--transcript-terminator);
    font-family: var(--webchat__font--primary);
    font-size: var(--webchat__font-size--transcript-terminator);
    margin: calc(var(--webchat__transcript--spacing) / 2);
    padding: calc(var(--webchat__transcript--spacing) / 2);
  }
}