perf(animation): improves _progress() hot function

- progress() is the function where more time is spent during any swipe gesture
- replace iterating over the _fx properties, using an array instead
- optimize pointerCoord(), profiler showed it’s one of the most called functions

src/animations/animation.ts

@@ -10,7 +10,7 @@ export class Animation {
   private _cL: number;
   private _e: HTMLElement[];
   private _eL: number;
-  private _fx: {[key: string]: EffectProperty};
+  private _fx: EffectProperty[];
   private _dur: number = null;
   private _es: string = null;
   private _bfSty: { [property: string]: any; };
@@ -159,26 +159,39 @@ export class Animation {
    * @private
    * NO DOM
    */
+
+  private _getProp(name: string): EffectProperty {
+    if (this._fx) {
+      return this._fx.find((prop) => prop.name === name);
+    } else {
+      this._fx = [];
+    }
+    return null;
+  }
+
   private _addProp(state: string, prop: string, val: any): EffectProperty {
-    this._fx = this._fx || {};
-    let fxProp = this._fx[prop];
+    let fxProp = this._getProp(prop);
 
     if (!fxProp) {
       // first time we've see this EffectProperty
-      fxProp = this._fx[prop] = {
-        trans: (TRANSFORMS[prop] === 1)
-      };
+      var shouldTrans = (TRANSFORMS[prop] === 1);
+      fxProp = {
+        name: prop,
+        trans: shouldTrans,
 
         // add the will-change property for transforms or opacity
-      fxProp.wc = (fxProp.trans ? CSS.transform : prop);
+        wc: (shouldTrans ? CSS.transform : prop)
+      };
+      this._fx.push(fxProp);
     }
 
     // add from/to EffectState to the EffectProperty
-    let fxState: EffectState = (<any>fxProp)[state] = {
+    let fxState: EffectState = {
       val: val,
       num: null,
       unit: '',
     };
+    fxProp[state] = fxState;
 
     if (typeof val === 'string' && val.indexOf(' ') < 0) {
       let r = val.match(CSS_VALUE_REGEX);
@@ -594,18 +607,23 @@ export class Animation {
    */
   _progress(stepValue: number) {
     // bread 'n butter
-    var val: any;
+    let val: any;
+    let effects = this._fx;
+    let nuElements = this._eL;
+
+    if (!effects || !nuElements) {
+      return;
+    }
 
-    if (this._fx && this._eL) {
     // flip the number if we're going in reverse
     if (this._rv) {
       stepValue = ((stepValue * -1) + 1);
     }
-      var transforms: string[] = [];
-      var effects = this._fx;
+    var i, j;
+    var finalTransform: string = '';
     var elements = this._e;
-      for (var prop in effects) {
-        var fx = effects[prop];
+    for (i = 0; i < effects.length; i++) {
+      var fx = effects[i];
 
       if (fx.from && fx.to) {
         var fromNum = fx.from.num;
@@ -626,19 +644,17 @@ export class Animation {
         } else if (tweenEffect) {
           // EVERYTHING IN BETWEEN
           val = (((toNum - fromNum) * stepValue) + fromNum) + fx.to.unit;
-
-          } else {
-            val = null;
         }
 
         if (val !== null) {
+          var prop = fx.name;
           if (fx.trans) {
-              transforms.push(prop + '(' + val + ')');
+            finalTransform += prop + '(' + val + ') ';
 
           } else {
-              for (var i = 0; i < this._eL; i++) {
+            for (j = 0; j < nuElements; j++) {
               // ******** DOM WRITE ****************
-                elements[i].style[prop] = val;
+              elements[j].style[prop] = val;
             }
           }
         }
@@ -646,22 +662,19 @@ export class Animation {
     }
 
     // place all transforms on the same property
-      if (transforms.length) {
+    if (finalTransform.length) {
       if (!this._rv && stepValue !== 1 || this._rv && stepValue !== 0) {
-          transforms.push('translateZ(0px)');
+        finalTransform += 'translateZ(0px)';
       }
 
-        var transformString = transforms.join(' ');
       var cssTransform = CSS.transform;
-        for (var i = 0; i < this._eL; i++) {
+      for (i = 0; i < elements.length; i++) {
         // ******** DOM WRITE ****************
-          elements[i].style[cssTransform] = transformString;
+        elements[i].style[cssTransform] = finalTransform;
       }
     }
   }
 
-  }
-
   /**
    * @private
    * DOM WRITE
@@ -900,15 +913,16 @@ export class Animation {
    */
   _willChg(addWillChange: boolean) {
     let wc: string[];
-
-    if (addWillChange) {
+    var effects = this._fx;
+    if (addWillChange && effects) {
       wc = [];
-      for (var prop in this._fx) {
-        if (this._fx[prop].wc === 'webkitTransform') {
+      for (var i = 0; i < effects.length; i++) {
+        var propWC = effects[i].wc;
+        if (propWC === 'webkitTransform') {
           wc.push('transform', '-webkit-transform');
 
         } else {
-          wc.push(this._fx[prop].wc);
+          wc.push(propWC);
         }
       }
     }
@@ -1164,6 +1178,7 @@ export interface PlayOptions {
 }
 
 export interface EffectProperty {
+  name: string;
   trans: boolean;
   wc?: string;
   to?: EffectState;

src/components/menu/menu.scss

@@ -51,7 +51,7 @@ ion-menu ion-backdrop {
   z-index: -1;
   display: none;
 
-  opacity: .1;
+  opacity: .01;
 }
 
 .menu-content {

src/components/refresher/test/refresher.spec.ts

@@ -232,7 +232,8 @@ describe('Refresher', () => {
   function touchEv(y: number) {
     return {
       type: 'mockTouch',
-      touches: [{clientY: y}],
+      pageX: 0,
+      pageY: y,
       preventDefault: function(){}
     };
   }

src/gestures/drag-gesture.ts

@@ -117,7 +117,7 @@ export class PanGesture {
       let coord = pointerCoord(ev);
       if (this.detector.detect(coord)) {
 
-        if (this.detector.pan() !== 0 && this.canCapture(ev) &&
+        if (this.detector.pan() !== 0 &&
           (!this.gestute || this.gestute.capture())) {
           this.onDragStart(ev);
           this.captured = true;
@@ -156,7 +156,6 @@ export class PanGesture {
 
   // Implemented in a subclass
   canStart(ev: any): boolean { return true; }
-  canCapture(ev: any): boolean { return true; }
   onDragStart(ev: any) { }
   onDragMove(ev: any) { }
   onDragEnd(ev: any) { }

src/util/dom.ts

@@ -195,16 +195,18 @@ export function windowLoad(callback?: Function) {
 export function pointerCoord(ev: any): PointerCoordinates {
   // get coordinates for either a mouse click
   // or a touch depending on the given event
-  let c = { x: 0, y: 0 };
   if (ev) {
-    const touches = ev.touches && ev.touches.length ? ev.touches : [ev];
-    const e = (ev.changedTouches && ev.changedTouches[0]) || touches[0];
-    if (e) {
-      c.x = e.clientX || e.pageX || 0;
-      c.y = e.clientY || e.pageY || 0;
+    var changedTouches = ev.changedTouches;
+    if (changedTouches && changedTouches.length > 0) {
+      var touch = changedTouches[0];
+      return { x: touch.clientX, y: touch.clientY };
+    }
+    var pageX = ev.pageX;
+    if (pageX !== undefined) {
+      return { x: pageX, y: ev.pageY };
     }
   }
-  return c;
+  return { x: 0, y: 0 };
 }
 
 export function hasPointerMoved(threshold: number, startCoord: PointerCoordinates, endCoord: PointerCoordinates) {