input.scss

@import "./input.vars";

// Input
// --------------------------------------------------

:host {
  /**
   * @prop --background: Background of the input
   *
   * @prop --color: Color of the input text
   *
   * @prop --padding-top: Top padding of the input
   * @prop --padding-end: Right padding if direction is left-to-right, and left padding if direction is right-to-left of the input
   * @prop --padding-bottom: Bottom padding of the input
   * @prop --padding-start: Left padding if direction is left-to-right, and right padding if direction is right-to-left of the input
   *
   * @prop --placeholder-color: Color of the input placeholder text
   * @prop --placeholder-font-style: Font style of the input placeholder text
   * @prop --placeholder-font-weight: Font weight of the input placeholder text
   * @prop --placeholder-opacity: Opacity of the input placeholder text
   *
   * @prop --highlight-height: The height of the highlight on the input. Only applies to md mode.
   * @prop --highlight-color-focused: The color of the highlight on the input when focused
   * @prop --highlight-color-valid: The color of the highlight on the input when valid
   * @prop --highlight-color-invalid: The color of the highlight on the input when invalid
   *
   * @prop --border-color: Color of the border below the input when using helper text, error text, or counter
   * @prop --border-radius: Radius of the input. A large radius may display unevenly when using fill="outline"; if needed, use shape="round" instead or increase --padding-start.
   * @prop --border-style: Style of the border below the input when using helper text, error text, or counter
   * @prop --border-width: Width of the border below the input when using helper text, error text, or counter
   */
  --placeholder-color: initial;
  --placeholder-font-style: initial;
  --placeholder-font-weight: initial;
  --placeholder-opacity: #{$placeholder-opacity};
  --padding-top: 0px;
  --padding-end: 0px;
  --padding-bottom: 0px;
  --padding-start: 0px;
  --background: transparent;
  --color: initial;
  --border-style: solid;
  --highlight-color-focused: #{ion-color(primary, base)};
  --highlight-color-valid: #{ion-color(success, base)};
  --highlight-color-invalid: #{ion-color(danger, base)};

  /**
   * This is a private API that is used to switch
   * out the highlight color based on the state
   * of the component without having to write
   * different selectors for different fill variants.
   */
  --highlight-color: var(--highlight-color-focused);

  display: block;

  position: relative;

  width: 100%;

  min-height: 44px;

  /* stylelint-disable-next-line all */
  padding: 0 !important;

  color: var(--color);

  font-family: $font-family-base;

  z-index: $z-index-item-input;
}

:host-context(ion-item)[slot="start"],
:host-context(ion-item)[slot="end"] {
  width: auto;
}

:host(.ion-color) {
  --highlight-color-focused: #{current-color(base)};
}

// Input Wrapper
// ----------------------------------------------------------------

/**
 * Since the label sits on top of the element,
 * the component needs to be taller otherwise the
 * label will appear too close to the input text.
 */
:host(.input-label-placement-floating),
:host(.input-label-placement-stacked) {
  min-height: 56px;
}

// Native Text Input
// --------------------------------------------------

.native-input {
  @include padding(0, 0, 0, 0);
  @include text-inherit();

  display: inline-block;

  position: relative;

  flex: 1;

  width: 100%;
  max-width: 100%;
  max-height: 100%;

  border: 0;

  outline: none;

  background: transparent;

  box-sizing: border-box;
  appearance: none;

  /**
   * This ensures the input
   * remains on top of any decoration
   * that we render (particularly the
   * outline border when fill="outline").
   * If we did not do this then Axe would
   * be unable to determine the color
   * contrast of the input.
   */
  z-index: 1;

  &::placeholder {
    color: var(--placeholder-color);

    font-family: inherit;
    font-style: var(--placeholder-font-style);
    font-weight: var(--placeholder-font-weight);

    opacity: var(--placeholder-opacity);
  }

  &:-webkit-autofill {
    background-color: transparent;
  }

  &:invalid {
    box-shadow: none;
  }

  &::-ms-clear {
    display: none;
  }
}

// Input Cover: Unfocused
// --------------------------------------------------
// The input cover is the div that actually receives the
// tap/click event when scroll assist is configured to true.
// This make it so the native input element is not clickable.
// This will only show when the scroll assist is configured
// otherwise the .input-cover will not be rendered at all
// The input cover is not clickable when the input is disabled
.cloned-input {
  @include position(0, null, 0, 0);

  position: absolute;

  pointer-events: none;
}

/**
 * The cloned input needs to be disabled on
 * Android otherwise the viewport will still
 * shift when running scroll assist.
 */
.cloned-input:disabled {
  opacity: 1;
}

// Clear Input Icon
// --------------------------------------------------

.input-clear-icon {
  @include margin(auto);
  @include padding(0);
  @include background-position(center);

  display: flex;

  align-items: center;
  justify-content: center;

  width: 30px;
  height: 30px;

  border: 0;

  outline: none;

  background-color: transparent;
  background-repeat: no-repeat;

  color: $text-color-step-400;

  visibility: hidden;
  appearance: none;
}

:host(.in-item-color) .input-clear-icon {
  color: inherit;
}

/**
 * Normally, we would not want to use :focus
 * here because that would mean tapping the button
 * on mobile would focus it (and keep it focused).
 * However, the clear button always disappears after
 * being activated, so we never get to that state.
 */
.input-clear-icon:focus {
  opacity: 0.5;
}

:host(.has-value) .input-clear-icon {
  visibility: visible;
}

// Input Wrapper
// ----------------------------------------------------------------

.input-wrapper {
  @include padding(var(--padding-top), var(--padding-end), var(--padding-bottom), var(--padding-start));
  @include border-radius(var(--border-radius));

  display: flex;

  position: relative;

  flex-grow: 1;

  align-items: stretch;

  height: inherit;

  min-height: inherit;

  transition: background-color 15ms linear;

  background: var(--background);

  line-height: normal;
}

// Input Native Wrapper
// ----------------------------------------------------------------

.native-wrapper {
  display: flex;

  position: relative;

  flex-grow: 1;

  // ensure start/end slot content is vertically centered
  align-items: center;

  width: 100%;
}

// Input Highlight
// ----------------------------------------------------------------

:host(.ion-touched.ion-invalid) {
  --highlight-color: var(--highlight-color-invalid);
}

/**
 * The component highlight is only shown
 * on focus, so we can safely set the valid
 * color state when valid. If we
 * set it when .has-focus is present then
 * the highlight color would change
 * from the valid color to the component's
 * color during the transition after the
 * component loses focus.
 */
:host(.ion-valid) {
  --highlight-color: var(--highlight-color-valid);
}

// Input Bottom Content
// ----------------------------------------------------------------

.input-bottom {
  /**
   * The bottom content should take on the start and end
   * padding so it is always aligned with either the label
   * or the start of the text input.
   */
  @include padding(5px, var(--padding-end), 0, var(--padding-start));

  display: flex;

  justify-content: space-between;

  border-top: var(--border-width) var(--border-style) var(--border-color);

  font-size: dynamic-font(12px);
}

/**
 * If the input has a validity state, the
 * border and label should reflect that as a color.
 * The invalid state should show if the input is
 * invalid and has already been touched.
 * The valid state should show if the input
 * is valid, has already been touched, and
 * is currently focused. Do not show the valid
 * highlight when the input is blurred.
 */
:host(.has-focus.ion-valid),
:host(.ion-touched.ion-invalid) {
  --border-color: var(--highlight-color);
}

// Input Hint Text
// ----------------------------------------------------------------

/**
 * Error text should only be shown when .ion-invalid is
 * present on the input. Otherwise the helper text should
 * be shown.
 */
.input-bottom .error-text {
  display: none;

  color: var(--highlight-color-invalid);
}

.input-bottom .helper-text {
  display: block;

  color: #{$text-color-step-450};
}

:host(.ion-touched.ion-invalid) .input-bottom .error-text {
  display: block;
}

:host(.ion-touched.ion-invalid) .input-bottom .helper-text {
  display: none;
}

// Input Max Length Counter
// ----------------------------------------------------------------

.input-bottom .counter {
  /**
   * Counter should always be at
   * the end of the container even
   * when no helper/error texts are used.
   */
  @include margin-horizontal(auto, null);

  color: #{$text-color-step-450};

  white-space: nowrap;

  padding-inline-start: 16px;
}

// Input Native
// ----------------------------------------------------------------

:host(.has-focus) input {
  caret-color: var(--highlight-color);
}

// Input Label
// ----------------------------------------------------------------

.label-text-wrapper {
  /**
   * This causes the label to take up
   * the entire height of its container
   * while still keeping the text centered.
   */
  display: flex;

  align-items: center;

  /**
   * Label text should not extend
   * beyond the bounds of the input.
   * However, we do not set the max
   * width to 100% because then
   * only the label would show and users
   * would not be able to see what they are typing.
   */
  max-width: 200px;

  transition: color 150ms cubic-bezier(.4, 0, .2, 1), transform 150ms cubic-bezier(.4, 0, .2, 1);

  /**
   * This ensures that double tapping this text
   * clicks the <label> and focuses the input
   * when a screen reader is enabled.
   */
  pointer-events: none;
}

/**
 * We need to use two elements instead of
 * one. The .label-text-wrapper is responsible
 * for centering the label text vertically regardless
 * of the input height using flexbox.
 *
 * The .label-text element is responsible for controlling
 * overflow when label-placement="fixed".
 * We want the ellipses to show up when the
 * fixed label overflows, but text-overflow: ellipsis only
 * works on block-level elements. A flex item is
 * considered blockified (https://www.w3.org/TR/css-display-3/#blockify).
 */
.label-text,
::slotted([slot="label"]) {
  text-overflow: ellipsis;

  white-space: nowrap;

  overflow: hidden;
}

/**
 * If no label text is placed into the slot
 * then the element should be hidden otherwise
 * there will be additional margins added.
 */
.label-text-wrapper-hidden,
.input-outline-notch-hidden {
  display: none;
}

.input-wrapper input {
  /**
   * When the floating label appears on top of the
   * input, we need to fade the input out so that the
   * label does not overlap with the placeholder.
   */
  transition: opacity 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

// Input Label Placement - Start
// ----------------------------------------------------------------

/**
 * Label is on the left of the input in LTR and
 * on the right in RTL.
 */
:host(.input-label-placement-start) .input-wrapper {
  flex-direction: row;
}

:host(.input-label-placement-start) .label-text-wrapper {
  /**
   * The margin between the label and
   * the input should be on the end
   * when the label sits at the start.
   */
  @include margin(0, $form-control-label-margin, 0, 0);
}

// Input Label Placement - End
// ----------------------------------------------------------------

/**
 * Label is on the right of the input in LTR and
 * on the left in RTL.
 */
:host(.input-label-placement-end) .input-wrapper {
  flex-direction: row-reverse;
}

/**
 * The margin between the label and
 * the input should be on the start
 * when the label sits at the end.
 */
:host(.input-label-placement-end) .label-text-wrapper {
  @include margin(0, 0, 0, $form-control-label-margin);
}

// Input Label Placement - Fixed
// ----------------------------------------------------------------

:host(.input-label-placement-fixed) .label-text-wrapper {
  /**
   * The margin between the label and
   * the input should be on the end
   * when the label sits at the start.
   */
  @include margin(0, $form-control-label-margin, 0, 0);
}

/**
 * Label is on the left of the input in LTR and
 * on the right in RTL. Label also has a fixed width.
 */
:host(.input-label-placement-fixed) .label-text {
  flex: 0 0 100px;

  width: 100px;
  min-width: 100px;
  max-width: 200px;
}

// Input Label Placement - Stacked and Floating
// ----------------------------------------------------------------

/**
 * Stacked: Label sits above the input and is scaled down.
 * Floating: Label sits over the input when the input has no
 * value and is blurred. Label sits above the input and is scaled
 * down when the input is focused or has a value.
 *
 */
:host(.input-label-placement-stacked) .input-wrapper,
:host(.input-label-placement-floating) .input-wrapper {
  flex-direction: column;
  align-items: start;
}

/**
 * Ensures that the label animates
 * up and to the left in LTR or
 * up and to the right in RTL.
 */
:host(.input-label-placement-stacked) .label-text-wrapper,
:host(.input-label-placement-floating) .label-text-wrapper {
  @include transform-origin(start, top);

  max-width: 100%;

  /**
   * The 2 ensures the label
   * remains on top of any browser
   * autofill background too.
   */
  z-index: 2;
}

/**
 * Ensures the input does not
 * overlap the label.
 */
:host(.input-label-placement-stacked) input,
:host(.input-label-placement-floating) input {
  @include margin(1px, 0, 0, 0);
}

/**
 * This makes the label sit over the input
 * when the input is blurred and has no value.
 */
:host(.input-label-placement-floating) .label-text-wrapper {
  @include transform(translateY(100%), scale(1));
}

/**
 * The input should be hidden when the label
 * is on top of the input. This prevents the label
 * from overlapping any placeholder value.
 */
:host(.input-label-placement-floating) input {
  opacity: 0;
}

:host(.has-focus.input-label-placement-floating) input,
:host(.has-value.input-label-placement-floating) input {
  opacity: 1;
}

/**
 * This makes the label sit above the input.
 */
:host(.label-floating) .label-text-wrapper {
  @include transform(translateY(50%), scale(#{$form-control-label-stacked-scale}));

  /**
   * Label text should not extend
   * beyond the bounds of the input.
   */
  max-width: calc(100% / #{$form-control-label-stacked-scale});
}

// Start/End Slots
// ----------------------------------------------------------------

::slotted([slot="start"]:last-of-type) {
  margin-inline-end: $form-control-label-margin;
  margin-inline-start: 0;
}

::slotted([slot="end"]:first-of-type) {
  margin-inline-start: $form-control-label-margin;
  margin-inline-end: 0;
}

/**
 * The input password toggle component should be hidden when the input is readonly/disabled
 * because it is not possible to edit a password.
 */
:host([disabled]) ::slotted(ion-input-password-toggle),
:host([readonly]) ::slotted(ion-input-password-toggle) {
  display: none;
}