feat(true lazy rendering)

addon/components/attach-popover.js

@@ -63,13 +63,24 @@ export default Component.extend({
     },
 
     registerAPI(api) {
-      // Only 'popperTarget' has observers, everything else can be a direct property
       this._disableEventListeners = api.disableEventListeners;
       this._enableEventListeners = api.enableEventListeners;
       this._popperElement = api.popperElement;
       this._update = api.update;
 
-      this.set('popperTarget', api.popperTarget);
+      if (this._isHidden && !this.isDestroying && !this.isDestroyed) {
+        // Hide the attachment until it has been positioned,
+        // preventing jank during initial positioning
+        this._popperElement.style.visibility = 'hidden';
+
+        // The attachment has no width if initially hidden. This can cause it to be positioned so
+        // far to the right that it overflows the screen until enough updates fix its position.
+        // We avoid this by positioning initially hidden elements in the top left of the screen.
+        // The attachment will then correctly update its position from the first this._show()
+        this._popperElement.style.transform = null;
+
+        this._popperElement.style.display = this.get('isShown') ? '' : 'none';
+      }
     }
   },
 
@@ -129,6 +140,13 @@ export default Component.extend({
   }),
 
   _setIsVisibleAfterDelay(isVisible, delay) {
+    if (!this._popperElement) {
+      this._animationTimeout = requestAnimationFrame(() => {
+        this._animationTimeout = this._setIsVisibleAfterDelay(isVisible, delay);
+      });
+
+      return;
+    }
     const onChange = this.get('onChange');
 
     if (delay) {
@@ -137,6 +155,10 @@ export default Component.extend({
           if (!this.isDestroyed && !this.isDestroying) {
             this._popperElement.style.display = isVisible ? '' : 'none';
 
+            // Prevent jank by making the attachment invisible until positioned.
+            // The visibility style will be toggled by this._startShowAnimation()
+            this._popperElement.style.visibility = isVisible ? 'hidden' : '';
+
             if (onChange) {
               onChange(isVisible);
             }
@@ -146,6 +168,10 @@ export default Component.extend({
     } else {
       this._popperElement.style.display = isVisible ? '' : 'none';
 
+      // Prevent jank by making the attachment invisible until positioned.
+      // The visibility style will be toggled by this._startShowAnimation()
+      this._popperElement.style.visibility = isVisible ? 'hidden' : '';
+
       if (onChange) {
         onChange(isVisible);
       }
@@ -179,13 +205,16 @@ export default Component.extend({
   init() {
     this._super(...arguments);
 
+    // Used to determine the attachments initial parent element
+    this._parentFinder = self.document ? self.document.createTextNode('') : '';
+
     // Holds the current popper target so event listeners can be removed if the target changes
     this._currentTarget = null;
 
     // The debounced _hide() and _show() are stored here so they can be cancelled when necessary
     this._delayedVisibilityToggle = null;
 
-    this.id = this.id || `${guidFor(this)}-tooltip`;
+    this.id = this.id || `${guidFor(this)}-popper`;
 
     // The final source of truth on whether or not all _hide() or _show() actions have completed
     this._isHidden = true;
@@ -243,37 +272,13 @@ export default Component.extend({
   didInsertElement() {
     this._super(...arguments);
 
-    // The attachment has no width if initially hidden. This can cause it to be positioned so far
-    // to the right that it overflows the screen until enough updates fix its position.
-    // We avoid this issue by positioning initially hidden elements in the top left of the screen.
-    // The attachment will then correctly update its position from the first this._show()
-    next(this, () => {
-      if (this._isHidden && !this.isDestroying && !this.isDestroyed) {
-        this._popperElement.style.transform = null;
-
-        // Hide the attachment until it has been positioned, preventing jank during initial positioning
-        this._popperElement.style.visibility = 'hidden';
-      }
-    });
-
-    this._popperElement.style.display = this.get('isShown') ? '' : 'none';
-
     this._initializeAttacher();
   },
 
   _initializeAttacher() {
     this._removeEventListeners();
 
-    this._currentTarget = this.get('popperTarget');
-
-    if (!this._currentTarget) {
-      // Hide the attachment until a valid target is found
-      if (!this._isHidden) {
-        this._hide();
-      }
-
-      return;
-    }
+    this.set('_currentTarget', this.get('popperTarget') || this._parentFinder.parentNode);
 
     this._addListenersForShowEvents();
 
@@ -382,8 +387,8 @@ export default Component.extend({
       const popperElement = this._popperElement;
 
       // Wait until the element is visible before continuing
-      if (popperElement.style.display === 'none') {
-        this._startShowAnimation();
+      if (!popperElement || popperElement.style.display === 'none') {
+        this._animationTimeout = this._startShowAnimation();
 
         return;
       }

addon/components/attach-tooltip.js

@@ -17,6 +17,12 @@ export default AttachPopover.extend({
     }
   }),
 
+  didInsertElement() {
+    this._super(...arguments);
+
+    this._currentTarget.setAttribute('aria-describedby', this.id);
+  },
+
   popperTargetChanged: observer('popperTarget', function() {
     const oldTarget = this._currentTarget;
     if (oldTarget) {

addon/templates/components/attach-popover.hbs

@@ -1,14 +1,16 @@
-{{#ember-popper ariaRole=ariaRole
-                class="ember-attacher"
-                eventsEnabled=false
-                id=id
-                modifiers=_modifiers
-                placement=placement
-                popperContainer=popperContainer
-                registerAPI=(action 'registerAPI')
-                renderInPlace=renderInPlace
-                popperTarget=popperTarget as |emberPopper|}}
-  {{#if _shouldRender}}
+{{unbound _parentFinder}}
+
+{{#if (and _currentTarget _shouldRender)}}
+  {{#ember-popper ariaRole=ariaRole
+                  class="ember-attacher"
+                  eventsEnabled=false
+                  id=id
+                  modifiers=_modifiers
+                  placement=placement
+                  popperContainer=popperContainer
+                  popperTarget=_currentTarget
+                  registerAPI=(action 'registerAPI')
+                  renderInPlace=renderInPlace as |emberPopper|}}
     <div class="{{_class}}" style="{{_transitionDurationCss}}">
       {{yield (hash emberPopper=emberPopper hide=(action 'hide'))}}
 
@@ -19,5 +21,5 @@
         <div x-circle style="{{_circleTransitionDuration}}"></div>
       {{/if}}
     </div>
-  {{/if}}
-{{/ember-popper}}
+  {{/ember-popper}}
+{{/if}}

app/templates/components/attach-popover.js

@@ -0,0 +1 @@
+export { default } from 'ember-attacher/templates/components/attach-popover';

package.json

@@ -33,7 +33,7 @@
     "ember-cli-babel": "^6.11.0",
     "ember-cli-htmlbars": "^2.0.2",
     "ember-cli-sass": "^7.1.4",
-    "ember-popper": "^0.8.3",
+    "ember-popper": "^0.9.0",
     "ember-truth-helpers": "^2.0.0"
   },
   "devDependencies": {