paged-page/marginbox.html at main · pagedjs/paged-page · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Paged Horizontal Margin</title>
  <script type="module" src="/lib/PagedPreview.js"></script>
  <style>
    body style {
      display: block;
      white-space: pre;
      font-family: monospace;
      max-width: 80ch;
      background-color: rgb(243, 243, 243);
      outline: 1px dotted grey;
    }

    paged-horizontal-margin {
      outline: 1px dotted red;
      height: 10mm;
      margin: 10mm 0;
      overflow: hidden;
    }

    paged-margin-box[slot="left"] {
      background: honeydew;
    }

    paged-margin-box[slot="center"] {
      background: lavender;
    }

    paged-margin-box[slot="right"] {
      background: papayawhip;
    }
  </style>
</head>
<body>
  <h1>
    <code>&lt;paged-horizontal-margin&gt;</code>
  </h1>
  <p>
    Tests and example usage.
  </p>
  <h2>
    Margin boxes, content inserted with slots, optionally sized with javascript.
  </h2>
  <p>
    Two components <code>&lt;paged-horizontal-margin&gt;</code> & <code>&lt;paged-margin-box&gt;</code>.
  </p>
  <p>
    <code>paged-horizontal-margin</code> offers three slots, <code>left</code>, <code>center</code>, <code>right</code>.
    It is assumed that only <code>paged-margin-box</code> elements are slotted in.
  </p>
  <p>
    <code>paged-margin-box</code> offers one unnamed slot, for the content of the margin box.
  </p>
  <code>
    <pre>
&lt;paged-horizontal-margin&gt;
  &lt;paged-margin-box slot="left"&gt;
    left
  &lt;/paged-margin-box&gt;
  &lt;paged-margin-box slot="center"&gt;
    center
  &lt;/paged-margin-box&gt;
  &lt;paged-margin-box slot="right"&gt;
    right
  &lt;/paged-margin-box&gt;
&lt;/paged-horizontal-margin&gt;
    </pre>
  </code>
  <paged-horizontal-margin>
    <paged-margin-box slot="left">
      left
    </paged-margin-box>
    <paged-margin-box slot="center">
      center
    </paged-margin-box>
    <paged-margin-box slot="right">
      right
    </paged-margin-box>
  </paged-horizontal-margin>

  <h3>Styling</h3>

  <p>
    Margin can be styled through an element selector. Specific boxes van be targeted with an
    attribute selector.
  </p>
  <style>
    paged-margin-box[slot="left"] {
      color: green;
    }
  </style>
  <paged-horizontal-margin>
    <paged-margin-box slot="left">
      left
    </paged-margin-box>
    <paged-margin-box slot="center">
      center
    </paged-margin-box>
    <paged-margin-box slot="right">
      right
    </paged-margin-box>
  </paged-horizontal-margin>
  <h3>Overwrite alignment</h3>
  <p>Overwrite the alignment of a single margin box</p>
  <style>
    paged-margin-box.left-aligned {
      justify-content: start;
      color: brown;
      font-weight: bold;
    }
  </style>
  <paged-horizontal-margin>
    <paged-margin-box slot="left">
      left
    </paged-margin-box>
    <paged-margin-box slot="center">
      center
    </paged-margin-box>
    <paged-margin-box slot="right" class="left-aligned">
      right
    </paged-margin-box>
  </paged-horizontal-margin>

  <h3>Overwrite alignment with an hierarchical selector</h3>
  <p>Overwrite the alignment of all margin boxes within a <code>paged-horizontal-margin</code>.</p>
  <style>
    paged-horizontal-margin.center-aligned paged-margin-box {
      justify-content: center;
      color: purple;
      font-weight: bold;
    }
  </style>
  <paged-horizontal-margin class="center-aligned">
    <paged-margin-box slot="left">
      left
    </paged-margin-box>
    <paged-margin-box slot="center">
      center
    </paged-margin-box>
    <paged-margin-box slot="right">
      right
    </paged-margin-box>
  </paged-horizontal-margin>

  <h3>Empty slots</h3>
  <p>Not all slots have to be filled.</p>
  <paged-horizontal-margin>
    <paged-margin-box slot="left">
      left
    </paged-margin-box>
    <paged-margin-box slot="right">
      right
    </paged-margin-box>
  </paged-horizontal-margin>
  <h3>Left & center uneven</h3>
  <p>
    On this page, a  simplified version of
    the <a href="https://github.com/pagedjs/pagedjs/blob/ba1e3c5e4b8d4404b577fbdb0f2b9356a67107e6/src/modules/paged-media/atpage.js#L1771-L1907">existing sizing algorithm</a>
    calculates and adjust the widths of the grid columns.
  </p>
  <paged-horizontal-margin>
    <paged-margin-box slot="left">
      Maecenas arcu massa, egestas vel est nec, mollis venenatis tortor. Ut eu finibus libero. Phasellus pharetra ante a purus ornare, eget facilisis sem ultricies.
    </paged-margin-box>
    <paged-margin-box slot="center">
      Maecenas arcu massa, egestas vel est nec, mollis venenatis tortor. Ut eu finibus libero.
    </paged-margin-box>
  </paged-horizontal-margin>
  <h3>Center & Right uneven</h3>
  <paged-horizontal-margin>
    <paged-margin-box slot="center">
      Maecenas arcu massa, egestas vel est nec, mollis venenatis tortor. Ut eu finibus libero.
    </paged-margin-box>
    <paged-margin-box slot="right">
      Maecenas arcu massa, egestas vel est nec, mollis venenatis tortor. Ut eu finibus libero. Phasellus pharetra ante a purus ornare, eget facilisis sem ultricies.
    </paged-margin-box>
  </paged-horizontal-margin>
  <h3>Left & right uneven content</h3>
  <paged-horizontal-margin>
    <paged-margin-box slot="left">
      Maecenas arcu massa, egestas vel est nec, mollis venenatis tortor. Ut eu finibus libero. Phasellus pharetra ante a purus ornare, eget facilisis sem ultricies.
    </paged-margin-box>
    <paged-margin-box slot="right">
      Maecenas arcu massa, egestas vel est nec, mollis venenatis tortor. Ut eu finibus libero.
    </paged-margin-box>
  </paged-horizontal-margin>
  <h3>Left & right even content</h3>
  <paged-horizontal-margin>
    <paged-margin-box slot="left">
      Maecenas arcu massa, egestas vel est nec, mollis venenatis tortor. Ut eu finibus libero.
    </paged-margin-box>
    <paged-margin-box slot="right">
      Maecenas arcu massa, egestas vel est nec, mollis venenatis tortor. Ut eu finibus libero.
    </paged-margin-box>
  </paged-horizontal-margin>
  <h3>Left</h3>
  <paged-horizontal-margin>
    <paged-margin-box slot="left">
      Maecenas arcu massa, egestas vel est nec, mollis venenatis tortor. Ut eu finibus libero. Phasellus pharetra ante a purus ornare, eget facilisis sem ultricies.
    </paged-margin-box>
  </paged-horizontal-margin>
  <h3>Center</h3>
  <paged-horizontal-margin>
    <paged-margin-box slot="center">
      Maecenas arcu massa, egestas vel est nec, mollis venenatis tortor. Ut eu finibus libero.
    </paged-margin-box>
  </paged-horizontal-margin>
  <h3>Right</h3>
  <paged-horizontal-margin>
    <paged-margin-box slot="right">
      Maecenas arcu massa, egestas vel est nec, mollis venenatis tortor. Ut eu finibus libero.
    </paged-margin-box>
  </paged-horizontal-margin>
  <h3>Left & right uneven content, with tags</h3>
  <p>
    Content slotted into a <code>paged-margin-box</code> can be tags.
  </p>
  <paged-horizontal-margin>
    <paged-margin-box slot="left">
      Maecenas arcu massa, egestas vel est nec, mollis venenatis tortor. Ut eu finibus libero. Phasellus pharetra ante a purus ornare, eget facilisis sem ultricies.
    </paged-margin-box>
    <paged-margin-box slot="right">
      <h2>Maecenas arcu massa, egestas vel est nec, mollis venenatis tortor. Ut eu finibus libero.</h2>
    </paged-margin-box>
  </paged-horizontal-margin>
  <h3>Filling a slot twice</h3>
  <p>
    Filling a slot twice leads to weird results, as an extra row is created in the grid.
  </p>
  <paged-horizontal-margin>
    <paged-margin-box slot="left">
      Maecenas arcu massa, egestas vel est nec, mollis venenatis tortor. Ut eu finibus libero.
    </paged-margin-box>
    <paged-margin-box slot="left">
       Phasellus pharetra ante a purus ornare, eget facilisis sem ultricies.
    </paged-margin-box>
    <paged-margin-box slot="right">
      Ut eu finibus libero.
    </paged-margin-box>
  </paged-horizontal-margin>
  <script>

    /**
     * Measure intrinsic width of content in the slot.
     *
     * @param {Array} nodes Nodes to measure
     * @returns int
     */
    function _measureIntrinsicContentWidth (nodes) {
      return Array.from(nodes).reduce((width, node) => {
        node.style.whiteSpace = 'nowrap';
        const nodeWidth = node.offsetWidth;
        node.style.removeProperty('white-space');
        return width + nodeWidth;
      }, 0);
    }

    Array.from(document.querySelectorAll('paged-horizontal-margin')).forEach((marginBox) => {
      /**
       * Simplified reimplementation of the sizing algorithm.
       * Does, at the moment not consider whether the margin boxes have a `max-width` value
       * other than `none` or `auto`.
       */

      // Find slotted content per box
      const contentNodesLeft = marginBox.querySelectorAll('[slot="left"]');
      const contentNodesCenter = marginBox.querySelectorAll('[slot="center"]');
      const contentNodesRight = marginBox.querySelectorAll('[slot="right"]');

      // Measure instrinsic size
      const contentWidthLeft = this._measureIntrinsicContentWidth(contentNodesLeft);
      const contentWidthCenter = this._measureIntrinsicContentWidth(contentNodesCenter);
      const contentWidthRight = this._measureIntrinsicContentWidth(contentNodesRight);

      let gridTemplateColumnsString = '';

      // Decide on proportions of the grid column.
      // Based on which boxes have content. And then their 'inherent width'
      // found by not allowing whitespace and then measuring the size.
      if (contentNodesCenter.length) {
        if (contentNodesLeft.length == 0 && contentNodesRight.length == 0) {
          // only center
          gridTemplateColumnsString = '0 1fr 0';
        }
        else {
          if (contentNodesLeft.length) {
            if (contentNodesRight.length) {
              const outerwidths = contentWidthLeft + contentWidthCenter + contentWidthRight;
              const newcenterWidth = contentWidthCenter * 100 / outerwidths;
              if (newcenterWidth > 40) {
                // left center right
                gridTemplateColumnsString = "minmax(16.66%, 1fr) minmax(33%, " + newcenterWidth + "%) minmax(16.66%, 1fr)";
              } else {
                // left center right
                gridTemplateColumnsString = "repeat(3, 1fr)";
              }
            }
            else {
              // left & center
              let outerwidths = contentWidthLeft + contentWidthCenter;
              let newcenterWidth = contentWidthCenter * 100 / outerwidths;
              gridTemplateColumnsString = "minmax(16.66%, 1fr) minmax(33%, " + newcenterWidth + "%) minmax(16.66%, 1fr)";
            }
          }
          else {
            // center & right
            const outerwidths = contentWidthRight + contentWidthCenter;
            const newcenterWidth = contentWidthCenter * 100 / outerwidths;
            gridTemplateColumnsString = "minmax(16.66%, 1fr) minmax(33%, " + newcenterWidth + "%) minmax(16.66%, 1fr)";
          }
        }
      }
      else if (contentNodesLeft.length) {
        if (contentNodesRight.length) {
          // left & right
          const outerwidths = contentWidthLeft + contentWidthRight;
          const newLeftWidth = contentWidthLeft * 100 / outerwidths;
          gridTemplateColumnsString = "minmax(16.66%, " + newLeftWidth + "%) 0 1fr";
        }
        else {
          // only left
          gridTemplateColumnsString = '1fr 0 0';
        }
      }
      else if (contentNodesRight.length) {
        // only right
        gridTemplateColumnsString = '0 0 1fr'
      }

      marginBox.style.gridTemplateColumns = gridTemplateColumnsString;
    });
  </script>
</body>
</html>