ionic-framework/core/src/components/picker-column/picker-column.scss

@import "../../themes/ionic.globals";

// Picker Column
// --------------------------------------------------

:host {
  display: flex;
  position: relative;

  align-items: center;

  justify-content: center;

  max-width: 100%;

  height: 200px;

  font-size: 22px;

  text-align: center;
}

/**
 * Renders an invisible element on top of the column that receives focus
 * events. This allows screen readers to navigate the column.
 */
.assistive-focusable {
  @include position(0, 0, 0, 0);
  position: absolute;

  z-index: 1;
  pointer-events: none;
}

// Hide the focus ring since screen readers will show their own
.assistive-focusable:focus {
  outline: none;
}

.picker-opts {
  /**
   * This padding must be set here and not on the
   * host to ensure that the focus highlight on the
   * column is not overly narrow.
   */
  @include padding(0px, 16px, 0px, 16px);

  /**
   * When using reactive data, such as in datetime's
   * wheel picker, there may be layout shifts between
   * individual columns in a picker as the columns
   * shrink to fit the widest item in the column.
   * Setting a minimum width avoids this layout shifting.
   *
   * Note that we need this min-width set on the same
   * element as the vertical padding (i.e. not on the
   * host).
   */
  min-width: 26px;
  max-height: 200px;

  outline: none;

  /**
   * Added so that text-align can be set on the host
   * from external components. For example, datetime
   * changes the alignment of specific columns in its
   * wheel pickers.
   */
  text-align: inherit;

  scroll-snap-type: y mandatory;

  /**
   * Need to explicitly set overflow-x: hidden
   * for older implementations of scroll snapping.
   */
  overflow-x: hidden;
  overflow-y: scroll;

  // Hide scrollbars on Firefox
  scrollbar-width: none;
}

.picker-item-empty {
  @include padding(0);
  @include margin(0);

  display: block;

  width: 100%;

  height: 34px;

  border: 0px;

  outline: none;

  background: transparent;

  color: inherit;

  font-family: $font-family-base;

  font-size: inherit;

  line-height: 34px;

  text-align: inherit;

  text-overflow: ellipsis;

  white-space: nowrap;

  overflow: hidden;
}

/**
 * Hide scrollbars on Chrome and Safari
 */
.picker-opts::-webkit-scrollbar {
  display: none;
}

::slotted(ion-picker-column-option) {
  display: block;

  scroll-snap-align: center;
}

.picker-item-empty,
:host(:not([disabled])) ::slotted(ion-picker-column-option.option-disabled) {
  scroll-snap-align: none;
}

::slotted([slot="prefix"]), ::slotted([slot="suffix"]) {
  max-width: 200px;

  text-overflow: ellipsis;

  white-space: nowrap;

  overflow: hidden;
}

::slotted([slot="prefix"]) {
  /**
   * This is added in addition to the column's own padding so that there is white
   * space between the slot and the column's focus highlight.
   */
  @include padding(0, 16px);

  justify-content: end;
}

::slotted([slot="suffix"]) {
  /**
   * This is added in addition to the column's own padding so that there is white
   * space between the slot and the column's focus highlight.
   */
  @include padding(0, 16px);

  justify-content: start;
}

:host(.picker-column-disabled) .picker-opts {
  overflow-y: hidden;
}

/**
 * When the column is disabled, none of the options
 * should be interactive. However, we do not disable
 * the buttons because that would require overriding the
 * app's preference for each option. In this case,
 * the picker column interactive as a whole is
 * disabled, not individual options.
 */
:host(.picker-column-disabled) ::slotted(ion-picker-column-option) {
  cursor: default;
  opacity: 0.4;
  pointer-events: none;
}

@media (any-hover: hover) {
  :host(:focus) .picker-opts {
    outline: none;

    background: current-color(base, 0.2);
  }
}