content.scss

@use "../../themes/mixins" as mixins;
@use "../../themes/functions.color" as color;

// Content
// --------------------------------------------------

:host {
  /**
   * @prop --ion-content-background: Background of the content
   *
   * @prop --ion-content-color: Color of the content
   *
   * @prop --ion-content-font-family: Font family of the content
   *
   * @prop --ion-content-overflow: Overflow behavior of the scrollable area
   *
   * @prop --ion-content-padding-top: Top padding of the content
   * @prop --ion-content-padding-end: Right padding if direction is left-to-right, and left padding if direction is right-to-left of the content
   * @prop --ion-content-padding-bottom: Bottom padding of the content
   * @prop --ion-content-padding-start: Left padding if direction is left-to-right, and right padding if direction is right-to-left of the content
   */
  --internal-keyboard-offset: 0px;
  --internal-offset-top: 0px;
  --internal-offset-bottom: 0px;

  display: block;
  position: relative;

  flex: 1;

  width: 100%;
  height: 100%;

  /* stylelint-disable */
  margin: 0 !important;

  padding: 0 !important;
  /* stylelint-enable */

  font-family: var(--ion-content-font-family);

  contain: size style;
}

// Content Inner Scroll
// ---------------------------------------------

.inner-scroll {
  @include mixins.position(calc(var(--internal-offset-top) * -1), 0px, calc(var(--internal-offset-bottom) * -1), 0px);
  @include mixins.padding(
    calc(var(--ion-content-padding-top) + var(--internal-offset-top)),
    var(--ion-content-padding-end),
    calc(var(--ion-content-padding-bottom) + var(--internal-keyboard-offset) + var(--internal-offset-bottom)),
    var(--ion-content-padding-start)
  );

  position: absolute;

  color: var(--ion-content-color);

  box-sizing: border-box;

  overflow: hidden;

  /**
   * touch-action: manipulation is an alias
   * for this, but WebKit has an issue
   * where pointercancel events are not fired
   * when scrolling: https://bugs.webkit.org/show_bug.cgi?id=240917
   * Using the long form below avoids the issue.
   */
  touch-action: pan-x pan-y pinch-zoom;
}

:host(.ion-color) .inner-scroll {
  background: color.current-color(base);
  color: color.current-color(contrast);
}

// Content Scroll
// ---------------------------------------------

.scroll-y,
.scroll-x {
  /**
   * This adds `.inner-scroll` as part of the
   * stacking context in WebKit. Without it,
   * children of ion-content are treated as
   * siblings rather than descendants. This
   * can result in the children being put
   * into their own layers, degrading
   * scrolling performance.
   *
   * An optimization called "layer backing
   * sharing" usually kicks in to prevent
   * this, but having translate3d defeats
   * this optimization.
   *
   * See: https://bugs.webkit.org/show_bug.cgi?id=216701
   */
  z-index: 0;

  will-change: scroll-position;
}

.scroll-y {
  overflow-y: var(--ion-content-overflow);
  overscroll-behavior-y: contain;
}

.scroll-x {
  overflow-x: var(--ion-content-overflow);
  overscroll-behavior-x: contain;
}

// Content Background
// ---------------------------------------------

#background-content {
  @include mixins.position(calc(var(--internal-offset-top) * -1), 0px, calc(var(--internal-offset-bottom) * -1), 0px);

  position: absolute;

  background: var(--ion-content-background);
}

// Content Overscroll
// ---------------------------------------------

.overscroll::before,
.overscroll::after {
  position: absolute;

  width: 1px;
  height: 1px;

  content: "";
}

.overscroll::before {
  bottom: -1px;
}

.overscroll::after {
  top: -1px;
}

// Content Sizing
// ---------------------------------------------

:host(.content-sizing) {
  display: flex;

  flex-direction: column;

  /**
   * This resolves a sizing issue in popovers where extra long content
   * would overflow the popover's height, preventing scrolling. It's a
   * quirk of flexbox that forces the content to shrink to fit.
   *
   * overflow: hidden can't be used here because it prevents the visual
   * effect from showing on translucent headers.
   */
  min-height: 0;

  contain: none;
}

:host(.content-sizing) .inner-scroll {
  position: relative;

  /**
   * Because the outer content has display: flex here (to help enable
   * scrolling in a popover), offsetting via `top` (such as when using
   * a translucent header) creates white space under the content. Use
   * a negative margin instead to keep the bottom in place. (A similar
   * thing happens with `bottom` and footers.)
   */
  top: 0;
  bottom: 0;

  margin-top: calc(var(--internal-offset-top) * -1);
  margin-bottom: calc(var(--internal-offset-bottom) * -1);
}

// Content Slotted Elements
// ---------------------------------------------

// Elements with the "fixed" slot
::slotted([slot="fixed"]) {
  position: absolute;

  /**
   * When presenting ion-content inside of an ion-modal, the .inner-scroll
   * element is composited. In WebKit, the fixed content is not composited
   * causing it to appear under the main scrollable content as a result.
   * The fixed content is correctly composited in other browsers. Adding
   * the translateZ forces the fixed content to be composited so it correctly
   * shows on top of the scrollable content. Setting a negative z-index will
   * still allow the fixed content to appear under the scroll content if specified.
   */
  transform: translateZ(0);
}

// Content: iOS Mode Transition
// The transition shadow effect is only animated by the iOS transition
// builder, so these styles are only rendered in iOS mode.
// ---------------------------------------------

.transition-effect {
  display: none;
  position: absolute;

  width: 100%;
  height: 100vh;

  opacity: 0;

  pointer-events: none;
}

:host(.content-ltr) .transition-effect {
  /* stylelint-disable property-disallowed-list */
  left: -100%;
  /* stylelint-enable property-disallowed-list */
}

:host(.content-rtl) .transition-effect {
  /* stylelint-disable property-disallowed-list */
  right: -100%;
  /* stylelint-enable property-disallowed-list */
}

.transition-cover {
  position: absolute;

  /* stylelint-disable property-disallowed-list */
  right: 0;
  /* stylelint-enable property-disallowed-list */

  width: 100%;
  height: 100%;

  background: black;

  opacity: 0.1;
}

.transition-shadow {
  display: block;
  position: absolute;

  width: 100%;
  height: 100%;

  box-shadow: inset -9px 0 9px 0 rgba(0, 0, 100, 0.03);
}

:host(.content-ltr) .transition-shadow {
  /* stylelint-disable property-disallowed-list */
  right: 0;
  /* stylelint-enable property-disallowed-list */
}

:host(.content-rtl) .transition-shadow {
  /* stylelint-disable property-disallowed-list */
  left: 0;
  /* stylelint-enable property-disallowed-list */

  transform: scaleX(-1);
}