material-design-lite/src/checkbox/_checkbox.scss

/**
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

@import "../variables";
@import "../mixins";

.mdl-checkbox {
  position: relative;

  z-index: 1;

  vertical-align: middle;

  display: inline-block;

  box-sizing: border-box;
  width: 100%;
  height: $checkbox-label-height;
  margin: 0;
  padding: 0;

  &.is-upgraded {
    padding-left: $checkbox-button-size + $checkbox-padding;
  }
}

.mdl-checkbox__input {
  line-height: $checkbox-label-height;

  .mdl-checkbox.is-upgraded & {
    // Hide input element, while still making it respond to focus.
    position: absolute;
    width: 0;
    height: 0;
    margin: 0;
    padding: 0;
    opacity: 0;
    -ms-appearance: none;
    -moz-appearance: none;
    -webkit-appearance: none;
    appearance: none;
    border: none;
  }
}

.mdl-checkbox__box-outline {
  position: absolute;
  top: $checkbox-top-offset;
  left: 0;

  display: inline-block;

  box-sizing: border-box;
  width: $checkbox-button-size;
  height: $checkbox-button-size;
  margin: 0;

  cursor: pointer;
  overflow: hidden;

  border: 2px solid $checkbox-off-color;
  border-radius: 2px;

  z-index: 2;

  .mdl-checkbox.is-checked & {
    border: 2px solid $checkbox-color;
  }

  fieldset[disabled] .mdl-checkbox &,
  .mdl-checkbox.is-disabled & {
    border: 2px solid $checkbox-disabled-color;
    cursor: auto;
  }
}

.mdl-checkbox__focus-helper {
  position: absolute;
  top: $checkbox-top-offset;
  left: 0;

  display: inline-block;

  box-sizing: border-box;
  width: $checkbox-button-size;
  height: $checkbox-button-size;
  border-radius: 50%;

  background-color: transparent;

  .mdl-checkbox.is-focused & {
    box-shadow: 0 0 0px ($checkbox-button-size / 2) rgba(0, 0, 0, 0.1);
    background-color: rgba(0, 0, 0, 0.1);
  }

  .mdl-checkbox.is-focused.is-checked & {
    box-shadow: 0 0 0px ($checkbox-button-size / 2) $checkbox-focus-color;
    background-color: $checkbox-focus-color;
  }
}

.mdl-checkbox__tick-outline {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  mask: url("#{$checkbox-image-path}/tick-mask.svg?embed");

  background: transparent;
  @include material-animation-default(0.28s);
  transition-property: background;

  .mdl-checkbox.is-checked & {
    background: $checkbox-color url("#{$checkbox-image-path}/tick.svg?embed");
  }

  fieldset[disabled] .mdl-checkbox.is-checked &,
  .mdl-checkbox.is-checked.is-disabled & {
    background: $checkbox-disabled-color url("#{$checkbox-image-path}/tick.svg?embed");
  }
}

.mdl-checkbox__label {
  position: relative;
  cursor: pointer;
  font-size: $checkbox-label-font-size;
  line-height: $checkbox-label-height;
  margin: 0;

  fieldset[disabled] .mdl-checkbox &,
  .mdl-checkbox.is-disabled & {
    color: $checkbox-disabled-color;
    cursor: auto;
  }
}

.mdl-checkbox__ripple-container {
  position: absolute;
  z-index: 2;
  top: -(($checkbox-ripple-size - $checkbox-label-height) / 2);
  left: -(($checkbox-ripple-size - $checkbox-button-size) / 2);

  box-sizing: border-box;
  width: $checkbox-ripple-size;
  height: $checkbox-ripple-size;
  border-radius: 50%;

  cursor: pointer;

  overflow: hidden;
  -webkit-mask-image: -webkit-radial-gradient(circle, white, black);

  & .mdl-ripple {
    background: $checkbox-color;
  }

  fieldset[disabled] .mdl-checkbox &,
  .mdl-checkbox.is-disabled & {
    cursor: auto;
  }

  fieldset[disabled] .mdl-checkbox & .mdl-ripple,
  .mdl-checkbox.is-disabled & .mdl-ripple {
    background: transparent;
  }
}