px-vis-svg-canvas.html

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Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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    http://www.apache.org/licenses/LICENSE-2.0

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<link rel="import" href="../polymer/polymer.html"/>
<link rel="import" href="px-vis-behavior-common.html" />
<link rel="import" href="px-vis-behavior-d3.html" />
<link rel="import" href="px-vis-svg.html" />
<link rel="import" href="px-vis-canvas.html" />
<link rel="import" href="css/px-vis-svg-canvas-styles.html">


<!--

### Usage

    <px-vis-svg-canvas
        svg="{{svg}}"
        canvas-context="{{canvasContext}}"
        svg-lower="{{svgLower}}"
        width="[[width]]"
        height="[[height]]"
        margin="[[margin]]">
    </px-vis-svg-canvas>

@element px-vis-svg
@blurb Element which creates 2 SVG elements, and a canvas element between the two svg elements.
@homepage index.html
@demo demo.html
-->


<dom-module id="px-vis-svg-canvas">
  <template>
    <style include="px-vis-svg-canvas-styles"></style>
    <style>
      .noPointer {
        pointer-events: none;
      }
    </style>

    <div
      class="rel-container"
      style$="height:[[height]]px; width:[[width]]px">
      <slot name="0"></slot>
      <px-vis-svg
        class="abs-elem inline--flex"
        svg="{{svgLower}}"
        px-svg-elem="{{pxSvgElemLower}}"
        width="[[width]]"
        height="[[height]]"
        margin="[[margin]]"
        offset="[[offset]]">
      </px-vis-svg>
      <slot name="1"></slot>
      <px-vis-canvas
        class="abs-elem inline--flex"
        canvas-context="{{canvasContext}}"
        width="[[width]]"
        height="[[height]]"
        margin="[[margin]]"
        offset="[[offset]]">
      </px-vis-canvas>

      <slot name="2"></slot>
      <template id="canvasTemplate" is="dom-repeat" items="[[_returnKeys(canvasLayersConfig.*, width, height, margin.*, offset.*)]]">
        <px-vis-canvas
          class="abs-elem inline--flex"
          style="[[_returnPointerEvents(item, canvasLayersConfig.*)]]"
          width="[[_returnProp(item, 'width', canvasLayersConfig.*, width)]]"
          height="[[_returnProp(item, 'height', canvasLayersConfig.*, height)]]"
          margin="[[_returnProp(item, 'margin', canvasLayersConfig.*, margin)]]"
          offset="[[_returnProp(item, 'offset', canvasLayersConfig.*, offset)]]">
        </px-vis-canvas>
      </template>

      <slot name="3"></slot>
      <px-vis-svg
        class="abs-elem inline--flex noPointer"
        svg="{{svg}}"
        px-svg-elem="{{pxSvgElem}}"
        width="[[width]]"
        height="[[height]]"
        margin="[[margin]]"
        offset="[[offset]]">
      </px-vis-svg>
      <slot name="4"></slot>
    </div>
  </template>
</dom-module>

<script>
    Polymer({

        is: 'px-vis-svg-canvas',
        behaviors: [
          PxVisBehavior.sizing,
          PxVisBehaviorD3.canvasContext,
          PxVisBehaviorD3.svg,
          PxVisBehaviorD3.svgLower
        ],

        /**
         * Properties block, expose attribute values to the DOM via 'reflect'
         *
         * @property properties
         * @type Object
         */
        properties: {

        },

        listeners: {
          'px-vis-canvas-context-updated': '_assignCanvas',
        },

        _assignCanvas: function(evt) {
          var normalized = Polymer.dom(evt),
              key = this.$.canvasTemplate.itemForElement(normalized.rootTarget);

          if(key) {
            this.set('canvasLayers.' + key, evt.detail.data);
          }
        },

        _returnKeys: function() {
          return Object.keys(this.canvasLayersConfig)
        },

        _returnProp: function(item, prop) {
          if(this.canvasLayersConfig[item][prop]) {
            return this.canvasLayersConfig[item][prop];
          }
          return this[prop];
        },

        _returnPointerEvents: function(item, confs) {
          return this.canvasLayersConfig[item]['mouseevents'] ? 'pointer-events: all;': 'pointer-events: none;';
        }
    });
</script>