ionic-framework/core/src/components/select/select.scss

@import "./select.vars";

// Select
// --------------------------------------------------

:host {
  /**
   * @prop --background: Background of the select
   * @prop --padding-top: Top padding of the select
   * @prop --padding-end: Right padding if direction is left-to-right, and left padding if direction is right-to-left of the select
   * @prop --padding-bottom: Bottom padding of the select
   * @prop --padding-start: Left padding if direction is left-to-right, and right padding if direction is right-to-left of the select
   *
   * @prop --placeholder-color: Color of the select placeholder text
   * @prop --placeholder-opacity: Opacity of the select placeholder text
   *
   * @prop --highlight-height: The height of the highlight on the select. Only applies to md mode.
   * @prop --highlight-color-focused: The color of the highlight on the select when focused
   * @prop --highlight-color-invalid: The color of the highlight on the select when invalid
   * @prop --highlight-color-valid: The color of the highlight on the select when valid
   *
   * @prop --border-color: Color of the select border
   * @prop --border-radius: Radius of the select border. 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 select border
   * @prop --border-width: Width of the select border
   *
   * @prop --ripple-color: The color of the ripple effect on MD mode.
   */
  --padding-top: 0px;
  --padding-end: 0px;
  --padding-bottom: 0px;
  --padding-start: 0px;
  --placeholder-color: currentColor;
  --placeholder-opacity: #{$placeholder-opacity};
  --background: transparent;
  --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;

  font-family: $font-family-base;

  white-space: nowrap;

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

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

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

// Select Used in ion-item
// --------------------------------------------------

// The flex property is required here in order to allow
// the select to shrink inside of an item otherwise it
// always wraps to the next line even when it can shrink
:host(.in-item) {
  flex: 1 1 0;
}

:host(.select-disabled) {
  pointer-events: none;
}

:host(.has-focus) button {
  border: 2px solid #5e9ed6;
}

/**
 * Select can be slotted
 * in components such as item and
 * toolbar which is why we do not
 * limit the below behavior to just ion-item.
 */
:host([slot="start"]),
:host([slot="end"]) {
  // Reset the flex property when the select
  // is slotted to avoid growing the element larger
  // than its content.
  flex: initial;

  width: auto;
}

.select-placeholder {
  color: var(--placeholder-color);

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

button {
  @include visually-hidden();
}

// Select Icon
// --------------------------------------------------

.select-icon {
  @include margin(0, 0, 0, $select-icon-margin-start);

  position: relative;

  /**
   * Prevent the icon from shrinking when the label and/or
   * selected item text is long enough to fill the rest of
   * the container.
   */
  flex-shrink: 0;
}

/**
 * Ensure that the select icon has
 * the correct color contrast when
 * used inside of an item.
 */
:host(.in-item-color) .select-icon {
  color: inherit;
}

/**
 * The select icon should be centered with
 * the entire container not just the control
 * with floating/stacked labels.
 */
:host(.select-label-placement-stacked) .select-icon,
:host(.select-label-placement-floating) .select-icon {
  position: absolute;

  height: 100%;
}

/**
 * This positions the icon at the correct
 * edge of the component with LTR and RTL
 * text directions. The position mixin cannot be
 * used here because the icon is in the Shadow DOM.
 */
:host(.select-ltr.select-label-placement-stacked) .select-icon,
:host(.select-ltr.select-label-placement-floating) .select-icon {
  // stylelint-disable-next-line property-disallowed-list
  right: var(--padding-end, 0);
}

:host(.select-rtl.select-label-placement-stacked) .select-icon,
:host(.select-rtl.select-label-placement-floating) .select-icon {
  // stylelint-disable-next-line property-disallowed-list
  left: var(--padding-start, 0);
}

// Select Text
// --------------------------------------------------
.select-text {
  flex: 1;

  min-width: 16px;

  font-size: inherit;

  text-overflow: ellipsis;

  white-space: inherit;

  overflow: hidden;
}

// Select Wrapper
// --------------------------------------------------

.select-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: center;
  justify-content: space-between;

  height: inherit;

  /**
   * This allows developers to set the height
   * on the host of the element but still have
   * the label take up the full height
   * of the parent.
   */
  min-height: inherit;

  transition: background-color 15ms linear;

  background: var(--background);

  line-height: normal;

  cursor: inherit;

  box-sizing: border-box;
}

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

.select-wrapper-inner {
  display: flex;

  align-items: center;

  overflow: hidden;
}

:host(.select-label-placement-stacked) .select-wrapper-inner,
:host(.select-label-placement-floating) .select-wrapper-inner {
  /**
   * When using a stacked/floating label, the inner wrapper is
   * stacked vertically under the label container. This line
   * ensures that the inner wrapper fills all the remaining height
   * of the component.
   */
  flex-grow: 1;
}

// Select 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 touched/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);
}

// Select Bottom Content
// ----------------------------------------------------------------

.select-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 select.
   */
  @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);

  white-space: normal;
}

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

// Select Hint Text
// ----------------------------------------------------------------

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

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

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

  color: $text-color-step-300;
}

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

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

// Select 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 select.
   * 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,
.select-outline-notch-hidden {
  display: none;
}

// Select Native Wrapper
// ----------------------------------------------------------------

.native-wrapper {
  display: flex;

  align-items: center;

  /**
   * 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);

  /**
   * This ensures that the .select-text gets
   * truncated with ellipses when the text is
   * too long for the screen.
   */
  overflow: hidden;
}

// Select Justify
// --------------------------------------------------

:host(.select-justify-space-between) .select-wrapper {
  justify-content: space-between;
}

:host(.select-justify-start) .select-wrapper {
  justify-content: start;
}

:host(.select-justify-end) .select-wrapper {
  justify-content: end;
}

// Select Label Placement - Start
// ----------------------------------------------------------------

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

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

// Select Label Placement - End
// ----------------------------------------------------------------

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

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

// Select Label Placement - Fixed
// ----------------------------------------------------------------

:host(.select-label-placement-fixed) .label-text-wrapper {
  /**
   * The margin between the label and
   * the select 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 select in LTR and
 * on the right in RTL. Label also has a fixed width.
 */
:host(.select-label-placement-fixed) .label-text-wrapper {
  flex: 0 0 100px;

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

// Select Label Placement - Stacked and Floating
// ----------------------------------------------------------------

/**
 * Stacked: Label sits above the select and is scaled down.
 * Floating: Label sits over the select when the select has no
 * value and is blurred. Label sits above the input and is scaled
 * down when the select is focused or has a value.
 *
 */
:host(.select-label-placement-stacked) .select-wrapper,
:host(.select-label-placement-floating) .select-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(.select-label-placement-stacked) .label-text-wrapper,
:host(.select-label-placement-floating) .label-text-wrapper {
  max-width: 100%;
}

:host(.select-ltr.select-label-placement-stacked) .label-text-wrapper,
:host(.select-ltr.select-label-placement-floating) .label-text-wrapper {
  // stylelint-disable-next-line property-disallowed-list
  transform-origin: left top;
}

:host(.select-rtl.select-label-placement-stacked) .label-text-wrapper,
:host(.select-rtl.select-label-placement-floating) .label-text-wrapper {
  // stylelint-disable-next-line property-disallowed-list
  transform-origin: right top;
}

/**
 * Ensures the select does not
 * overlap the label.
 * Also ensure that the native wrapper
 * takes up the remaining available height and width.
 */
:host(.select-label-placement-stacked) .native-wrapper,
:host(.select-label-placement-floating) .native-wrapper {
  @include margin(1px, 0, 0, 0);

  flex-grow: 1;

  width: 100%;
}

/**
 * This makes the label sit over the select
 * when the select is blurred and has no value.
 * The label should not sit over the select if the
 * select has a placeholder.
 * Note: This is different from what ion-input does
 * because the activating the select causes an overlay
 * to appear. This makes it hard to read the placeholder.
 * With ion-input, the input just focuses and the placeholder
 * is still easy to read.
 */
:host(.select-label-placement-floating) .label-text-wrapper {
  @include transform(translateY(100%), scale(1));
}

/**
 * The placeholder should be hidden when the label
 * is on top of the select. This prevents the label
 * from overlapping any placeholder value.
 *
 * TODO(FW-5592): Remove :not(.label-floating) piece
 */
:host(.select-label-placement-floating:not(.label-floating)) .native-wrapper .select-placeholder {
  opacity: 0;
}

/**
 * We don't use .label-floating here because that would
 * also include the case where the label is floating due
 * to content in the start/end slot. We want the opacity
 * to remain at the default in this case, since the select
 * isn't being actively interacted with.
 *
 * TODO(FW-5592): Change entire selector to:
 * :host(.label-floating.select-label-placement-floating) .native-wrapper .select-placeholder
 */
:host(.select-expanded.select-label-placement-floating) .native-wrapper .select-placeholder,
:host(.has-focus.select-label-placement-floating) .native-wrapper .select-placeholder,
:host(.has-value.select-label-placement-floating) .native-wrapper .select-placeholder {
  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"]), ::slotted([slot="end"]) {
  /**
   * Prevent the slots from shrinking when the label and/or
   * selected item text is long enough to fill the rest of
   * the container.
   */
  flex-shrink: 0;
}

::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;
}