checkbox.scss

@import "../../themes/ionic.globals";
@import "./checkbox.vars.scss";

// Checkbox
// --------------------------------------------------

:host {
  /**
   * @prop --size: Size of the checkbox icon
   *
   * @prop --checkbox-background: Background of the checkbox icon
   * @prop --checkbox-background-checked: Background of the checkbox icon when checked
   *
   * @prop --border-color: Border color of the checkbox icon
   * @prop --border-radius: Border radius of the checkbox icon
   * @prop --border-width: Border width of the checkbox icon
   * @prop --border-style: Border style of the checkbox icon
   * @prop --border-color-checked: Border color of the checkbox icon when checked
   *
   * @prop --transition: Transition of the checkbox icon
   *
   * @prop --checkmark-color: Color of the checkbox checkmark when checked
   * @prop --checkmark-width: Stroke width of the checkbox checkmark
   */
  --checkbox-background-checked: #{ion-color(primary, base)};
  --border-color-checked: #{ion-color(primary, base)};
  --checkmark-color: #{ion-color(primary, contrast)};
  --transition: none;

  display: inline-block;

  position: relative;

  cursor: pointer;

  user-select: none;
  z-index: $z-index-item-input;
}

:host(.in-item) {
  flex: 1 1 0;

  width: 100%;
  height: 100%;
}

/**
 * Checkbox 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 checkbox
  // is slotted to avoid growing the element larger
  // than its content.
  flex: initial;

  width: auto;
}

:host(.ion-color) {
  --checkbox-background-checked: #{current-color(base)};
  --border-color-checked: #{current-color(base)};
  --checkmark-color: #{current-color(contrast)};
}

.checkbox-wrapper {
  display: flex;

  flex-grow: 1;

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

  height: inherit;

  cursor: inherit;
}

.label-text-wrapper {
  text-overflow: ellipsis;

  white-space: nowrap;

  overflow: hidden;
}

// Checkboxes that are not slotted inside an item and are not used with a
// stacked label should have margins equal to those of the label.
:host(.in-item) .label-text-wrapper,
:host(.in-item:not(.checkbox-label-placement-stacked):not([slot])) .native-wrapper {
  @include margin($checkbox-item-label-margin-top, null, $checkbox-item-label-margin-bottom, null);
}

:host(.in-item.checkbox-label-placement-stacked) .label-text-wrapper {
  @include margin($checkbox-item-label-margin-top, null, $form-control-label-margin, null);
}

:host(.in-item.checkbox-label-placement-stacked) .native-wrapper {
  @include margin(null, null, $checkbox-item-label-margin-bottom, null);
}

/**
 * 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 {
  display: none;
}

/**
 * The native input must be hidden with display instead of visibility or 
 * aria-hidden to avoid accessibility issues with nested interactive elements.
 */
input {
  display: none;
}

.native-wrapper {
  display: flex;

  align-items: center;
}

.checkbox-icon {
  @include border-radius(var(--border-radius));

  position: relative;

  width: var(--size);
  height: var(--size);

  transition: var(--transition);

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

  background: var(--checkbox-background);

  box-sizing: border-box;
}

.checkbox-icon path {
  fill: none;
  stroke: var(--checkmark-color);
  stroke-width: var(--checkmark-width);

  opacity: 0;
}

// Checkbox Bottom Content
// ----------------------------------------------------------------

.checkbox-bottom {
  @include padding(4px, null, null, null);

  display: flex;

  justify-content: space-between;

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

  white-space: normal;
}

:host(.checkbox-label-placement-stacked) .checkbox-bottom {
  font-size: dynamic-font(16px);
}

// Checkbox Hint Text
// ----------------------------------------------------------------

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

  color: ion-color(danger, base);
}

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

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

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

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

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

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

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

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

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

  justify-content: start;
}

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

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

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

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

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

// Label Placement - Stacked
// ----------------------------------------------------------------

/**
 * Label is on top of the checkbox.
 */
:host(.checkbox-label-placement-stacked) .checkbox-wrapper {
  flex-direction: column;

  text-align: center;
}

:host(.checkbox-label-placement-stacked) .label-text-wrapper {
  @include transform(scale(#{$form-control-label-stacked-scale}));

  /**
   * The margin between the label and
   * the checkbox should be on the bottom
   * when the label sits at the top.
   */
  @include margin(null, 0, $form-control-label-margin, 0);

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

:host(.checkbox-label-placement-stacked.checkbox-alignment-start) .label-text-wrapper {
  @include transform-origin(start, top);
}

:host(.checkbox-label-placement-stacked.checkbox-alignment-center) .label-text-wrapper {
  @include transform-origin(center, top);
}

// Justify Content
// ---------------------------------------------

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

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

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

// Align Items
// ---------------------------------------------

:host(.checkbox-alignment-start) .checkbox-wrapper {
  align-items: start;
}

:host(.checkbox-alignment-center) .checkbox-wrapper {
  align-items: center;
}

// Justify Content & Align Items
// ---------------------------------------------

// The checkbox should be displayed as block when either justify
// or alignment is set; otherwise, these properties will have no
// visible effect.
:host(.checkbox-justify-space-between),
:host(.checkbox-justify-start),
:host(.checkbox-justify-end),
:host(.checkbox-alignment-start),
:host(.checkbox-alignment-center) {
  display: block;
}

// Checked / Indeterminate Checkbox
// ---------------------------------------------

:host(.checkbox-checked) .checkbox-icon,
:host(.checkbox-indeterminate) .checkbox-icon {
  border-color: var(--border-color-checked);

  background: var(--checkbox-background-checked);
}

:host(.checkbox-checked) .checkbox-icon path,
:host(.checkbox-indeterminate) .checkbox-icon path {
  opacity: 1;
}

// Disabled Checkbox
// ---------------------------------------------

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