@import '../style/variables';


@mixin cdk-overlay() {
  .cdk-overlay-container, .cdk-global-overlay-wrapper {
    // Disable events from being captured on the overlay container.
    pointer-events: none;

    // The container should be the size of the viewport.
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
  }

  // The overlay-container is an invisible element which contains all individual overlays.
  .cdk-overlay-container {
    position: fixed;
    z-index: $cdk-z-index-overlay-container;
  }

  // We use an extra wrapper element in order to use make the overlay itself a flex item.
  // This makes centering the overlay easy without running into the subpixel rendering
  // problems tied to using `transform` and without interfering with the other position
  // strategies.
  .cdk-global-overlay-wrapper {
    display: flex;
    position: absolute;
    z-index: $cdk-z-index-overlay;
  }

  // A single overlay pane.
  .cdk-overlay-pane {
    position: absolute;
    pointer-events: auto;
    box-sizing: border-box;
    z-index: $cdk-z-index-overlay;
  }

  .cdk-overlay-backdrop {
    // TODO(jelbourn): reuse sidenav fullscreen mixin.
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;

    z-index: $cdk-z-index-overlay-backdrop;
    pointer-events: auto;

    // TODO(jelbourn): figure out if there are actually spec'ed colors for both light and dark
    // themes here. Currently using the values from AngularJS Material.
    transition: opacity $swift-ease-out-duration $swift-ease-out-timing-function;
    opacity: 0;

    &.cdk-overlay-backdrop-showing {
      opacity: 0.48;
    }
  }

  .cdk-overlay-dark-backdrop {
    background: $cdk-overlay-dark-backdrop-background;
  }

  .cdk-overlay-transparent-backdrop {
    background: none;
  }

  // Used when disabling global scrolling.
  .cdk-global-scrollblock {
    position: fixed;

    // Necessary for the content not to lose its width. Note that we're using 100%, instead of
    // 100vw, because 100vw includes the width plus the scrollbar, whereas 100% is the width
    // that the element had before we made it `fixed`.
    width: 100%;

    // Note: this will always add a scrollbar to whatever element it is on, which can
    // potentially result in double scrollbars. It shouldn't be an issue, because we won't
    // block scrolling on a page that doesn't have a scrollbar in the first place.
    overflow-y: scroll;
  }
}