WIP - Remove canvas and use HTML/CSS

index.html

@@ -320,6 +320,9 @@ activeElement.getNode();  // Gets the DOM Element behind this element
   </div>
 </div>
 
+<div id="driver-page-overlay"></div>
+<div id="driver-highlighted-element-stage"></div>
+
 <script async src="//platform.twitter.com/widgets.js" charset="utf-8"></script>
 <script async defer src="//buttons.github.io/buttons.js"></script>
 <script src="//twemoji.maxcdn.com/2/twemoji.min.js?2.5"></script>

src/core/element.js

@@ -138,6 +138,9 @@ export default class Element {
    */
   onDeselected() {
     this.hidePopover();
+
+    this.node.classList.remove('driver-highlighted-element');
+
     this.highlightFinished = false;
 
     if (this.options.onDeselected) {
@@ -145,6 +148,14 @@ export default class Element {
     }
   }
 
+  getSize() {
+    const boundingRect = this.node.getBoundingClientRect();
+    return {
+      width: boundingRect.width,
+      height: boundingRect.height
+    };
+  }
+
   /**
    * Is called when the element is about to be highlighted
    * i.e. either if overlay has started moving the highlight towards
@@ -168,6 +179,8 @@ export default class Element {
   onHighlighted() {
     this.showPopover();
 
+    this.node.classList.add('driver-highlighted-element');
+
     this.highlightFinished = true;
 
     const highlightedElement = this;

src/core/overlay.js

 import Position from './position';
-import { ID_OVERLAY, OVERLAY_ZINDEX } from '../common/constants';
 
 /**
  * Responsible for overlay creation and manipulation i.e.
@@ -14,10 +13,8 @@ export default class Overlay {
   constructor(options, window, document) {
     this.options = options;
 
-    this.overlayAlpha = 0;                       // Is used to animate the layover
     this.positionToHighlight = new Position({}); // position at which layover is to be patched at
     this.highlightedPosition = new Position({}); // position at which layover is patched currently
-    this.redrawAnimation = null;                 // used to cancel the redraw animation
     this.highlightedElement = null;              // currently highlighted dom element (instance of Element)
     this.lastHighlightedElement = null;          // element that was highlighted before current one
 
@@ -27,31 +24,16 @@ export default class Overlay {
     this.document = document;
 
     this.resetOverlay();
-    this.setSize();
   }
 
   /**
    * Prepares the overlay
    */
   resetOverlay() {
-    // Check and remove the canvas if it already exists
-    const canvasOverlay = this.document.getElementById(ID_OVERLAY);
-    if (canvasOverlay && canvasOverlay.parentNode) {
-      canvasOverlay.parentNode.removeChild(canvasOverlay);
-    }
-
-    const overlay = this.document.createElement('canvas');
+    // @todo: append the elements if not there already
 
-    this.overlay = overlay;
-    this.context = overlay.getContext('2d');
-
-    this.overlay.id = ID_OVERLAY;
-    this.overlay.style.pointerEvents = 'none';
-    this.overlay.style.background = 'transparent';
-    this.overlay.style.position = 'fixed';
-    this.overlay.style.top = '0';
-    this.overlay.style.left = '0';
-    this.overlay.style.zIndex = OVERLAY_ZINDEX;
+    this.pageOverlay = this.document.getElementById('driver-page-overlay');
+    this.highlightStage = this.document.getElementById('driver-highlighted-element-stage');
   }
 
   /**
@@ -65,9 +47,6 @@ export default class Overlay {
       return;
     }
 
-    // @todo put it in the caller after testing
-    this.setSize();
-
     // Trigger the hook for highlight started
     element.onHighlightStarted();
 
@@ -123,6 +102,9 @@ export default class Overlay {
     this.highlightedElement = null;
     this.lastHighlightedElement = null;
 
+    this.pageOverlay.style.display = 'none';
+    this.highlightStage.style.display = 'none';
+
     this.draw();
   }
 
@@ -132,135 +114,26 @@ export default class Overlay {
    * Slowly eases towards the item to be selected.
    */
   draw() {
-    // Cache the response of this for re-use below
-    const canHighlight = this.positionToHighlight.canHighlight();
-
-    // Remove the existing cloak from the body
-    // it might be torn i.e. have patches from last highlight
-    this.removeCloak();
-    // Add the overlay on top of the whole body
-    this.addCloak();
-
-    const isFadingIn = this.overlayAlpha < 0.1;
-
-    if (canHighlight) {
-      if (isFadingIn) {
-        // Ignore the animation, just highlight the item at its current position
-        this.highlightedPosition = this.positionToHighlight;
-      } else {
-        // Slowly move towards the position to highlight
-        this.highlightedPosition.left += (this.positionToHighlight.left - this.highlightedPosition.left) * 0.18;
-        this.highlightedPosition.top += (this.positionToHighlight.top - this.highlightedPosition.top) * 0.18;
-        this.highlightedPosition.right += (this.positionToHighlight.right - this.highlightedPosition.right) * 0.18;
-        this.highlightedPosition.bottom += (this.positionToHighlight.bottom - this.highlightedPosition.bottom) * 0.18;
-      }
-    }
-
-    // Cut the chunk of overlay that is over the highlighted item
-    this.removeCloak({
-      posX: this.highlightedPosition.left - this.window.scrollX - this.options.padding,
-      posY: this.highlightedPosition.top - this.window.scrollY - this.options.padding,
-      width: (this.highlightedPosition.right - this.highlightedPosition.left) + (this.options.padding * 2),
-      height: (this.highlightedPosition.bottom - this.highlightedPosition.top) + (this.options.padding * 2),
-    });
-
-    // Fade the overlay in if we can highlight
-    if (canHighlight) {
-      if (!this.options.animate) {
-        this.overlayAlpha = this.options.opacity;
-      } else {
-        this.overlayAlpha += (this.options.opacity - this.overlayAlpha) * 0.08;
-      }
-    } else {
-      // otherwise fade out
-      this.overlayAlpha = Math.max((this.overlayAlpha * 0.85) - 0.02, 0);
-    }
-
-    // cancel any existing animation frames
-    // to avoid the overlapping of frames
-    this.window.cancelAnimationFrame(this.redrawAnimation);
-
-    // Continue drawing while we can highlight or we are still fading out
-    if (canHighlight || this.overlayAlpha > 0) {
-      // Add the overlay if not already there
-      if (!this.overlay.parentNode) {
-        this.document.body.appendChild(this.overlay);
-      }
-
-      // Stage a new animation frame only if the position has not been reached
-      // or the alpha has not yet fully reached fully required opacity
-      if (!this.hasPositionHighlighted()) {
-        this.redrawAnimation = this.window.requestAnimationFrame(this.draw);
-      } else if (!this.options.animate && isFadingIn) {
-        this.redrawAnimation = this.window.requestAnimationFrame(this.draw);
-      } else {
-        // Element has been highlighted
-        this.highlightedElement.onHighlighted();
-      }
-    } else if (this.overlay.parentNode) {
-      // Otherwise if the overlay is there, remove it
-      this.document.body.removeChild(this.overlay);
+    if (!this.highlightedElement || !this.positionToHighlight.canHighlight()) {
+      return;
     }
-  }
 
-  /**
-   * Checks if there as any position highlighted
-   * @returns {boolean}
-   */
-  hasPositionHighlighted() {
-    return this.positionToHighlight.equals(this.highlightedPosition) &&
-      this.overlayAlpha > (this.options.opacity - 0.05);
-  }
+    // Show the overlay
+    this.pageOverlay.style.display = 'block';
+    this.highlightStage.style.display = 'block';
 
-  /**
-   * Removes the cloak from the given position
-   * i.e. cuts the chunk of layout which is over the element
-   * to be highlighted
-   *
-   * @param {number} posX
-   * @param {number} posY
-   * @param {number} width
-   * @param {number} height
-   */
-  removeCloak({
-    posX = 0,
-    posY = 0,
-    width = this.overlay.width,
-    height = this.overlay.height,
-  } = {}) {
-    this.context.clearRect(posX, posY, width, height);
-  }
+    const elementSize = this.highlightedElement.getSize();
 
-  /**
-   * Adds the overlay i.e. to cover the given
-   * position with dark overlay
-   *
-   * @param {number} posX
-   * @param {number} posY
-   * @param {number} width
-   * @param {number} height
-   */
-  addCloak({
-    posX = 0,
-    posY = 0,
-    width = this.overlay.width,
-    height = this.overlay.height,
-  } = {}) {
-    this.context.fillStyle = `rgba( 0, 0, 0, ${this.overlayAlpha} )`;
-    this.context.fillRect(posX, posY, width, height);
-  }
+    // Show the stage
+    this.highlightStage.style.display = 'block';
+    this.highlightStage.style.position = 'absolute';
+    this.highlightStage.style.width = `${elementSize.width + this.options.padding}px`;
+    this.highlightStage.style.height = `${elementSize.height + this.options.padding}px`;
+    this.highlightStage.style.top = `${this.positionToHighlight.top}px`;
+    this.highlightStage.style.left = `${this.positionToHighlight.left}px`;
 
-  /**
-   * Sets the size for the overlay
-   *
-   * @param {number|null} width
-   * @param {number|null} height
-   */
-  setSize(width = null, height = null) {
-    // By default it is going to cover the whole page and then we will
-    // cut out a chunk for the element to be visible out of it
-    this.overlay.width = width || this.window.innerWidth;
-    this.overlay.height = height || this.window.innerHeight;
+    // Element has been highlighted
+    this.highlightedElement.onHighlighted();
   }
 
   /**
@@ -270,13 +143,10 @@ export default class Overlay {
    * @param {boolean} animate
    */
   refresh(animate = true) {
-    this.setSize();
-
     // If the highlighted element was there Cancel the
     // existing animation frame if any and highlight it again
     // as its position might have been changed
     if (this.highlightedElement) {
-      this.window.cancelAnimationFrame(this.redrawAnimation);
       this.highlight(this.highlightedElement, animate);
       this.highlightedElement.onHighlighted();
     }

src/driver.scss

@@ -105,4 +105,33 @@ div#driver-popover-item {
     font-weight: normal;
     zoom: 1;
   }
+}
+
+div#driver-page-overlay {
+  display: none;
+  width: 100%;
+  height: 100%;
+  background: black;
+  top: 0;
+  left: 0;
+  position: fixed;
+  opacity: 0.7;
+  pointer-events: none;
+  z-index: 100002 !important;
+}
+
+div#driver-highlighted-element-stage {
+  position: absolute;
+  top: 0;
+  left: 0;
+  height: 50px;
+  width: 300px;
+  background: white;
+  z-index: 100003 !important;
+  display: none;
+}
+
+.driver-highlighted-element {
+  z-index: 100004 !important;
+  position: relative;
 }
\ No newline at end of file

src/index.js

@@ -45,7 +45,6 @@ export default class Driver {
     this.steps = [];            // steps to be presented if any
     this.currentStep = 0;       // index for the currently highlighted step
 
-    this.onScroll = this.onScroll.bind(this);
     this.onResize = this.onResize.bind(this);
     this.onKeyUp = this.onKeyUp.bind(this);
     this.onClick = this.onClick.bind(this);
@@ -59,8 +58,6 @@ export default class Driver {
    * @todo: add throttling in all the listeners
    */
   bind() {
-    this.document.addEventListener('scroll', this.onScroll, false);
-    this.document.addEventListener('DOMMouseScroll', this.onScroll, false);
     this.window.addEventListener('resize', this.onResize, false);
     this.window.addEventListener('keyup', this.onKeyUp, false);
     this.window.addEventListener('click', this.onClick, false);
@@ -179,19 +176,6 @@ export default class Driver {
     return this.overlay.getLastHighlightedElement();
   }
 
-  /**
-   * Handler for the onScroll event on document
-   * Refreshes without animation on scroll to make sure
-   * that the highlighted part travels with the scroll
-   */
-  onScroll() {
-    if (!this.isActivated) {
-      return;
-    }
-
-    this.overlay.refresh(false);
-  }
-
   /**
    * Handler for the onResize DOM event
    * Refreshes with animation on scroll to make sure that

webpack.config.dev.js

@@ -18,16 +18,16 @@ module.exports = {
   },
   module: {
     rules: [
-      {
-        test: /\.js$/,
-        exclude: /node_modules/,
-        loader: 'eslint-loader',
-        enforce: 'pre',
-        options: {
-          failOnWarning: false,
-          failOnError: true,
-        },
-      },
+      // {
+      //   test: /\.js$/,
+      //   exclude: /node_modules/,
+      //   loader: 'eslint-loader',
+      //   enforce: 'pre',
+      //   options: {
+      //     failOnWarning: false,
+      //     failOnError: true,
+      //   },
+      // },
       {
         test: /\.js$/,
         exclude: /node_modules/,