bidirectional links

2021-03-10 22:33:55 -05:00
parent 22795467af
commit 1b95e9a8df
19 changed files with 643 additions and 7 deletions
--- a/_includes/link-previews.html
+++ b/_includes/link-previews.html
@ -0,0 +1,86 @@
+<!-- That file is not particularly elegant. This will need a refactor at some point. -->
+<div style="opacity: 0; display: none;" id='tooltip-wrapper'>
+  <div id='tooltip-content'>
+  </div>
+</div>
+
+<iframe style="display: none; height: 0; width: 0;" id='link-preview-iframe' src="">
+</iframe>
+
+<script>
+  var opacityTimeout;
+  var contentTimeout;
+  var transitionDurationMs = 100;
+
+  var iframe = document.getElementById('link-preview-iframe')
+  var tooltipWrapper = document.getElementById('tooltip-wrapper')
+  var tooltipContent = document.getElementById('tooltip-content')
+
+  function hideTooltip() {
+    opacityTimeout = setTimeout(function() {
+      tooltipWrapper.style.opacity = 0;
+      contentTimeout = setTimeout(function() {
+        tooltipContent.innerHTML = '';
+        tooltipWrapper.style.display = 'none';
+      }, transitionDurationMs + 1);
+    }, transitionDurationMs)
+  }
+
+  function showTooltip(event) {
+    var elem = event.target;
+    var elem_props = elem.getClientRects()[elem.getClientRects().length - 1];
+    var top = window.pageYOffset || document.documentElement.scrollTop
+
+    if (event.target.host === window.location.host) {
+      iframe.src = event.target.href
+      iframe.onload = function() {
+        tooltipContentHtml = ''
+        tooltipContentHtml += '<div style="font-weight: bold;">' + iframe.contentWindow.document.querySelector('h1').innerHTML + '</div>'
+        tooltipContentHtml += iframe.contentWindow.document.querySelector('content').innerHTML
+
+        tooltipContent.innerHTML = tooltipContentHtml
+
+        tooltipWrapper.style.display = 'block';
+        setTimeout(function() {
+          tooltipWrapper.style.opacity = 1;
+        }, 1)
+      }
+
+      tooltipWrapper.style.left = elem_props.left - (tooltipWrapper.offsetWidth / 2) + (elem_props.width / 2) + "px";
+      if ((window.innerHeight - elem_props.top) < (tooltipWrapper.offsetHeight)) {
+          tooltipWrapper.style.top = elem_props.top + top - tooltipWrapper.offsetHeight - 10 + "px";
+      } else if ((window.innerHeight - elem_props.top) > (tooltipWrapper.offsetHeight)) {
+          tooltipWrapper.style.top = elem_props.top + top + 35 + "px";
+      }
+
+      if ((elem_props.left + (elem_props.width / 2)) < (tooltipWrapper.offsetWidth / 2)) {
+          tooltipWrapper.style.left = "10px";
+      } else if ((document.body.clientWidth - elem_props.left - (elem_props.width / 2)) < (tooltipWrapper.offsetWidth / 2)) {
+          tooltipWrapper.style.left = document.body.clientWidth - tooltipWrapper.offsetWidth - 20 + "px";
+      }
+    }
+  }
+
+  function setupListeners(linkElement) {
+    linkElement.addEventListener('mouseleave', function(_event) {
+      hideTooltip();
+    });
+
+    tooltipWrapper.addEventListener('mouseleave', function(_event) {
+      hideTooltip();
+    });
+
+    linkElement.addEventListener('mouseenter', function(event) {
+      clearTimeout(opacityTimeout);
+      clearTimeout(contentTimeout);
+      showTooltip(event);
+    });
+
+    tooltipWrapper.addEventListener('mouseenter', function(event) {
+      clearTimeout(opacityTimeout);
+      clearTimeout(contentTimeout);
+    });
+  }
+
+  document.querySelectorAll('{{ include.wrapperQuerySelector }} a').forEach(setupListeners);
+</script>