fix(ripple): make ripples conform with specs

This makes the ripple service conform with the specifications and other Material reference implementations.

See https://material.io/guidelines/motion/material-motion.html#material-motion-how-does-material-move

This means the following:

 * Ripples now trigger on `mousedown`
 * Ripples now persists as long as the element is being hold.
 * No longer adds an unnecessary background ripple.
 * Removes the ugly `scale(0.00001)` for ripple animations

Not only visually the ripple has been changed. The whole renderer has been rewritten and now has a very simple API, that can be easily used by developers.

References #1434

Author: devversion

src/demo-app/ripple/ripple-demo.html

@@ -21,24 +21,18 @@
   <section>
     Speed
     <md-radio-group [(ngModel)]="rippleSpeed">
-      <md-radio-button name="demo-ripple-options" value="0.1">Slow</md-radio-button>
+      <md-radio-button name="demo-ripple-options" value="0.4">Slow</md-radio-button>
       <md-radio-button name="demo-ripple-options" value="1">Normal</md-radio-button>
-      <md-radio-button name="demo-ripple-options" value="4">Fast</md-radio-button>
+      <md-radio-button name="demo-ripple-options" value="2.5">Fast</md-radio-button>
     </md-radio-group>
   </section>
   <section>
     <md-input-container>
-      <input mdInput placeholder="Max radius" aria-label="radius" [(ngModel)]="maxRadius">
+      <input mdInput placeholder="Ripple radius" aria-label="radius" [(ngModel)]="radius">
     </md-input-container>
     <md-input-container>
       <input mdInput placeholder="Ripple color" aria-label="color" [(ngModel)]="rippleColor">
     </md-input-container>
-    <md-input-container>
-      <input mdInput
-             placeholder="Ripple background"
-             aria-label="background"
-             [(ngModel)]="rippleBackgroundColor">
-    </md-input-container>
   </section>
   <section>
     <button md-raised-button (click)="doManualRipple()">Manual ripple</button>
@@ -51,9 +45,8 @@
         [mdRippleCentered]="centered"
         [mdRippleDisabled]="disabled"
         [mdRippleUnbounded]="unbounded"
-        [mdRippleMaxRadius]="maxRadius"
+        [mdRippleRadius]="radius"
         [mdRippleColor]="rippleColor"
-        [mdRippleBackgroundColor]="rippleBackgroundColor"
         [mdRippleSpeedFactor]="rippleSpeed">
       Click me
     </div>

src/demo-app/ripple/ripple-demo.ts

@@ -9,23 +9,22 @@ import {MdRipple} from '@angular/material';
   styleUrls: ['ripple-demo.css'],
 })
 export class RippleDemo {
-  @ViewChild(MdRipple) manualRipple: MdRipple;
+  @ViewChild(MdRipple) ripple: MdRipple;
 
   centered = false;
   disabled = false;
   unbounded = false;
   rounded = false;
-  maxRadius: number = null;
+  radius: number = null;
   rippleSpeed = 1;
   rippleColor = '';
-  rippleBackgroundColor = '';
 
   disableButtonRipples = false;
 
   doManualRipple() {
-    if (this.manualRipple) {
-      window.setTimeout(() => this.manualRipple.start(), 10);
-      window.setTimeout(() => this.manualRipple.end(0, 0), 500);
+    if (this.ripple) {
+      this.ripple.createRipple(0, 0, { centered: true });
     }
   }
+
 }

src/lib/button/button.html

@@ -1,8 +1,6 @@
 <span class="md-button-wrapper"><ng-content></ng-content></span>
 <div md-ripple *ngIf="!_isRippleDisabled()" class="md-button-ripple"
     [class.md-button-ripple-round]="_isRoundButton()"
-    [mdRippleTrigger]="_getHostElement()"
-    [mdRippleColor]="_isRoundButton() ? 'rgba(255, 255, 255, 0.2)' : ''"
-    mdRippleBackgroundColor="rgba(0, 0, 0, 0)"></div>
+    [mdRippleTrigger]="_getHostElement()"></div>
 <!-- the touchstart handler prevents the overlay from capturing the initial tap on touch devices -->
 <div class="md-button-focus-overlay" (touchstart)="$event.preventDefault()"></div>

src/lib/checkbox/_checkbox-theme.scss

@@ -68,16 +68,16 @@
     }
   }
 
-  .md-checkbox:not(.md-checkbox-disabled) {
-    &.md-primary .md-checkbox-ripple .md-ripple-foreground {
+  md-checkbox:not(.md-checkbox-disabled) {
+    &.md-primary .md-checkbox-ripple .md-ripple-element {
       background-color: md-color($primary, 0.26);
     }
 
-    &.md-accent .md-checkbox-ripple .md-ripple-foreground {
+    &.md-accent .md-checkbox-ripple .md-ripple-element {
       background-color: md-color($accent, 0.26);
     }
 
-    &.md-warn .md-checkbox-ripple .md-ripple-foreground {
+    &.md-warn .md-checkbox-ripple .md-ripple-element {
       background-color: md-color($warn, 0.26);
     }
   }

src/lib/checkbox/checkbox.html

@@ -18,8 +18,7 @@
     <div md-ripple *ngIf="!_isRippleDisabled()" class="md-checkbox-ripple"
          [mdRippleTrigger]="_getHostElement()"
          [mdRippleCentered]="true"
-         [mdRippleSpeedFactor]="0.3"
-         mdRippleBackgroundColor="rgba(0, 0, 0, 0)"></div>
+         [mdRippleSpeedFactor]="0.3"></div>
     <div class="md-checkbox-frame"></div>
     <div class="md-checkbox-background">
       <svg version="1.1"

src/lib/core/option/option.html

@@ -1,3 +1,3 @@
 <ng-content></ng-content>
-<div class="md-option-ripple" *ngIf="!disabled" md-ripple mdRippleBackgroundColor="rgba(0,0,0,0)"
+<div class="md-option-ripple" *ngIf="!disabled" md-ripple
      [mdRippleTrigger]="_getHostElement()"></div>

src/lib/core/ripple/README.md

@@ -19,9 +19,7 @@ Properties:
 | --- | --- | --- |
 | `mdRippleTrigger` | Element | The DOM element that triggers the ripple when clicked. Defaults to the parent of the `md-ripple`.
 | `mdRippleColor` | string | Custom color for foreground ripples
-| `mdRippleBackgroundColor` | string | Custom color for the ripple background
 | `mdRippleCentered` | boolean | If true, the ripple animation originates from the center of the `md-ripple` bounds rather than from the location of the click event.
-| `mdRippleMaxRadius` | number | Optional fixed radius of foreground ripples when fully expanded. Mainly used in conjunction with `unbounded` attribute. If not set, ripples will expand from their origin to the most distant corner of the component's bounding rectangle.
+| `mdRippleRadius` | number | Optional fixed radius of foreground ripples when fully expanded. Mainly used in conjunction with `unbounded` attribute. If not set, ripples will expand from their origin to the most distant corner of the component's bounding rectangle.
 | `mdRippleUnbounded` | boolean | If true, foreground ripples will be visible outside the component's bounds.
-| `mdRippleFocused` | boolean | If true, the background ripple is shown using the current theme's accent color to indicate focus.
 | `mdRippleDisabled` | boolean | If true, click events on the trigger element will not activate ripples. The `start` and `end` methods can still be called to programmatically create ripples.

src/lib/core/ripple/_ripple.scss

@@ -1,11 +1,6 @@
 @import '../theming/theming';
 
-
-$md-ripple-focused-opacity: 0.1;
-$md-ripple-background-fade-duration: 300ms;
-$md-ripple-background-default-color: rgba(0, 0, 0, 0.0588);
-$md-ripple-foreground-initial-opacity: 0.25;
-$md-ripple-foreground-default-color: rgba(0, 0, 0, 0.0588);
+$md-ripple-element-color: rgba(0, 0, 0, 0.1);
 
 
 @mixin md-ripple() {
@@ -19,55 +14,19 @@ $md-ripple-foreground-default-color: rgba(0, 0, 0, 0.0588);
     overflow: visible;
   }
 
-  .md-ripple-background {
-    background-color: $md-ripple-background-default-color;
-    opacity: 0;
-    transition: opacity $md-ripple-background-fade-duration linear;
+  .md-ripple-element {
     position: absolute;
-    left: 0;
-    top: 0;
-    right: 0;
-    bottom: 0;
-  }
-
-  .md-ripple-unbounded .md-ripple-background {
-    display: none;
-  }
-
-  .md-ripple-background.md-ripple-active {
-    opacity: 1;
-  }
-
-  .md-ripple-focused .md-ripple-background {
-    opacity: 1;
-  }
-
-  .md-ripple-foreground {
-    background-color: $md-ripple-foreground-default-color;
     border-radius: 50%;
     pointer-events: none;
-    opacity: $md-ripple-foreground-initial-opacity;
-    position: absolute;
-    // The transition duration is manually set based on the ripple size.
-    transition: opacity, transform 0ms cubic-bezier(0, 0, 0.2, 1);
-  }
 
-  .md-ripple-foreground.md-ripple-fade-in {
-    opacity: 1;
-  }
+    background-color: $md-ripple-element-color;
 
-  .md-ripple-foreground.md-ripple-fade-out {
-    opacity: 0;
+    transition: opacity, transform 0ms cubic-bezier(0, 0, 0.2, 1);
+    transform: scale(0);
   }
 }
 
-@mixin md-ripple-theme($theme) {
-  $accent: map-get($theme, accent);
-
-  .md-ripple-focused .md-ripple-background {
-    background-color: md-color($accent, $md-ripple-focused-opacity);
-  }
-}
+@mixin md-ripple-theme($theme) {}
 
 
 // A mixin, which generates temporary ink ripple on a given component.