gr-opacity-diff-mode/gr-opacity-diff-mode.html

<!--
Copyright (C) 2018 The Android Open Source Project

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.
-->

<dom-module id="gr-opacity-diff-mode">
  <template>
    <style>
      :host {
        display: block;
      }
      .wrapper {
        box-shadow: 0 1px 3px rgba(0, 0, 0, .3);
        margin: 1em 0;
      }
      img {
        display: block;
        height: var(--img-height);
        margin: auto;
        position: absolute;
        width: var(--img-width);
      }
      #imageRevision {
        opacity: var(--my-opacity-value);
        z-index: 0.5;
      }
      #imageDiffContainer {
        height: var(--div-height);
        margin: auto;
        width: var(--div-width);
      }
      #controlsContainer {
        border-top: 1px solid var(--border-color, #ddd);
        display: flex;
      }
      #controlsBox {
        display: flex;
        justify-content: space-between;
        margin: 0 .5em;
        min-width: 32em;
        width: 100%;
      }
      label {
        align-items: center;
        display: flex;
        padding: 1em .5em;
      }
      input {
        margin: .5em;
      }
      #opacitySlider {
        width: 10em;
      }
    </style>
    <div class="wrapper">
      <div id="imageDiffContainer">
        <img on-load="_onImageLoad" id="imageBase"/>
        <img on-load="_onImageLoad" data-opacity$="{{opacityValue}}" id="imageRevision"/>
      </div>
      <div id="controlsContainer">
        <div id="controlsBox">
          <label>
            <input
                id="scaleSizesToggle"
                on-tap="handleScaleSizesToggle"
                type="checkbox">
            Scale to same size
          </label>
          <label>
            Revision image opacity
            <input
                id="opacitySlider"
                max="1.0"
                min="0.0"
                on-input="handleOpacityChange"
                step=".01"
                type="range"
                value="0.5"/>
          </label>
        </div>
      </div>
    </div>
  </template>
  <script src="gr-opacity-diff-mode.js"></script>
</dom-module>