Mock up code completion.

dart/site/try/code_completion_ui_mock/experiment.js

+var currentEntry;

[kasperl, 2014/03/13 07:39:58]

Copyright notice?

+

[kasperl, 2014/03/13 07:39:58]

It would be helpful to have a comment that explains what this is.

+var installedServerResults = false;
+
+var isDisplayingResults = false;
+
+(function() {
+  "use strict";
+  function hasModifier(/*KeyboardEvent*/ event) {
+    return event.getModifierState("Alt") ||
+        event.getModifierState("AltGraph") ||
+        event.getModifierState("CapsLock") ||
+        event.getModifierState("Control") ||
+        event.getModifierState("Fn") ||
+        event.getModifierState("Meta") ||
+        event.getModifierState("NumLock") ||
+        event.getModifierState("ScrollLock") ||
+        event.getModifierState("Scroll") ||
+        event.getModifierState("Win") ||
+        event.getModifierState("Shift") ||
+        event.getModifierState("SymbolLock") ||
+        event.getModifierState("OS");
+  }
+  function onKeydown(/*KeyboardEvent*/ event) {
+    if (!isDisplayingResults) {
+      isDisplayingResults = true;
+      document.querySelector('.dart-code-completion').style.display = 'block';
+      installedServerResults = true;
+      window.setTimeout(installServerResults, getRandomInt(1080, 2000));
+      return;
+    }
+    if (!installedServerResults) {
+      installedServerResults = true;
+      window.setTimeout(installServerResults, getRandomInt(1080, 2000));
+    }
+    var keyCode = event.keyCode;
+    var keyIdentifier = event.keyIdentifier;
+    var modifier = hasModifier(event);
+    if (!modifier) {
+      if (keyCode === 40) return moveActive(event, 1);
+      if (keyCode === 38) return moveActive(event, -1);
+    }
+    if (modifier) {
+      if (keyCode === 40) return selectServerResults(event);
+    }
+    console.log([keyCode, keyIdentifier, modifier]);
+    console.dir(event);
+  }
+  function moveActive(/*KeyboardEvent*/ event, /*int*/ distance) {
+    var entries = document.querySelectorAll('.dart-static>.dart-entry');
+    var activeIndex = -1;
+    for (var i = 0; i < entries.length; i++) {
+      if (entries[i].classList.contains('active')) {
+        activeIndex = i;
+        break;
+      }
+    }
+    var newIndex = activeIndex + distance;
+    if (0 <= newIndex && newIndex < entries.length) {
+      var newEntry = entries[newIndex];
+      currentEntry = newEntry;
+    }
+    if (0 <= newIndex && activeIndex !== -1) {
+      entries[activeIndex].classList.remove('active');
+    }
+    var serverResults = document.querySelectorAll('.dart-server>.dart-entry');
+    var serverResultCount = serverResults.length;
+    if (serverResultCount > 0) {
+      var cr = currentEntry.getBoundingClientRect();
+      var sr = document.querySelector('.dart-static').getBoundingClientRect();
+      if (cr.bottom - sr.top > sr.height) {

[kasperl, 2014/03/13 07:39:58]

One of these comparisons use > and the other >=. Is there a reason for that?

+        if (cr.top - sr.top >= sr.height) {
+          var entry = serverResults[0];
+          entry.parentNode.removeChild(entry);
+          currentEntry.parentNode.insertBefore(entry, currentEntry);
+          currentEntry = entry;
+          serverResultCount--;
+        } else {
+          console.log(cr.bottom - sr.top);
+        }
+        document.querySelector('.dart-static').style.height =
+            String((cr.bottom - sr.top)) + "px";

[kasperl, 2014/03/13 07:39:58]

No need to use String() here. If either the left or the right side of a + is a
string, you'll get string conversion.

+      } else {
+        currentEntry.scrollIntoView(false);
+      }
+    } else {
+      currentEntry.scrollIntoView(false);
+    }
+    if (serverResultCount === 0) {
+      // document.querySelector('.dart-static').classList.remove('dart-limited-height');

[kasperl, 2014/03/13 07:39:58]

Long line. Maybe explain why this is commented out?

+      // document.querySelector('.dart-static').style.height = '';
+      document.querySelector('.dart-server').style.display = 'none';
+    }
+    if (currentEntry != null) {
+      currentEntry.classList.add('active');
+    }
+  }
+  function selectServerResults(/*KeyboardEvent*/ event) {
+    var entries = document.querySelectorAll('.dart-static>.dart-entry.active');
+    for (var i = 0; i < entries.length; i++) {
+      entries[i].classList.remove('active');
+    }
+    return moveActive(event, 4);
+  }
+  function installServerResults() {
+    var mockServerResults = document.querySelectorAll('.mock-data>.dart-entry');
+    var results = document.querySelector('.dart-server');
+    results.style.display = 'block';
+    for (var i = 0; i < mockServerResults.length; i++) {
+      var result = mockServerResults[i];
+      result.parentNode.removeChild(result);
+      results.appendChild(result);
+    }
+  }
+  function getRandomInt(min, max) {
+    return Math.floor(Math.random() * (max - min + 1)) + min;
+  }
+  document.body.addEventListener('keydown', onKeydown);
+})();