feat(tabs): add animation when switching tabs, include optional dynamic height

e2e/components/tabs/tabs.e2e.ts

@@ -11,17 +11,17 @@ describe('tabs', () => {
       browser.get('/tabs');
       tabGroup = element(by.css('md-tab-group'));
       tabLabels = element.all(by.css('.md-tab-label'));
-      tabBodies = element.all(by.css('.md-tab-body'));
+      tabBodies = element.all(by.css('md-tab-body'));
     });
 
     it('should change tabs when the label is clicked', () => {
       tabLabels.get(1).click();
-      expect(getActiveStates(tabLabels)).toEqual([false, true, false]);
-      expect(getActiveStates(tabBodies)).toEqual([false, true, false]);
+      expect(getLabelActiveStates(tabLabels)).toEqual([false, true, false]);
+      expect(getBodyActiveStates(tabBodies)).toEqual([false, true, false]);
 
       tabLabels.get(0).click();
-      expect(getActiveStates(tabLabels)).toEqual([true, false, false]);
-      expect(getActiveStates(tabBodies)).toEqual([true, false, false]);
+      expect(getLabelActiveStates(tabLabels)).toEqual([true, false, false]);
+      expect(getBodyActiveStates(tabBodies)).toEqual([true, false, false]);
     });
 
     it('should change focus with keyboard interaction', () => {
@@ -77,8 +77,17 @@ function getFocusStates(elements: ElementArrayFinder) {
  * @param elements
  * @returns {webdriver.promise.Promise<Promise<boolean>[]>|webdriver.promise.Promise<T[]>}
  */
-function getActiveStates(elements: ElementArrayFinder) {
-  return getClassStates(elements, 'md-tab-active');
+function getLabelActiveStates(elements: ElementArrayFinder) {
+  return getClassStates(elements, 'md-tab-label-active');
+}
+
+/**
+ * Returns an array of true/false that represents the active states for the provided elements
+ * @param elements
+ * @returns {webdriver.promise.Promise<Promise<boolean>[]>|webdriver.promise.Promise<T[]>}
+ */
+function getBodyActiveStates(elements: ElementArrayFinder) {
+  return getClassStates(elements, 'md-tab-body-active');
 }
 
 /**

src/demo-app/tabs/tabs-demo.html

@@ -14,14 +14,84 @@ <h1>Tab Nav Bar</h1>
 </div>
 
 
-<h1>Tab Group Demo</h1>
+<h1>Tab Group Demo - Dynamic Height</h1>
 
-<md-tab-group class="demo-tab-group">
-  <md-tab *ngFor="let tab of tabs; let i = index" [disabled]="i == 1">
+<md-tab-group class="demo-tab-group" md-dynamic-height>
+  <md-tab *ngFor="let tab of tabs" [disabled]="tab.disabled">
+    <template md-tab-label>{{tab.label}}</template>
+    {{tab.content}}
+    <br>
+    <br>
+    <div *ngIf="tab.extraContent">
+      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nulla venenatis ante augue.
+      Phasellus volutpat neque ac dui mattis vulputate. Etiam consequat aliquam cursus.
+      In sodales pretium ultrices. Maecenas lectus est, sollicitudin consectetur felis nec,
+      feugiat ultricies mi. Aliquam erat volutpat. Nam placerat, tortor in ultrices porttitor,
+      orci enim rutrum enim, vel tempor sapien arcu a tellus. Vivamus convallis sodales ante varius
+      gravida. Curabitur a purus vel augue ultrices ultricies id a nisl. Nullam malesuada consequat
+      diam, a facilisis tortor volutpat et. Sed urna dolor, aliquet vitae posuere vulputate, euismod
+      ac lorem. Sed felis risus, pulvinar at interdum quis, vehicula sed odio. Phasellus in enim
+      venenatis, iaculis tortor eu, bibendum ante. Donec ac tellus dictum neque volutpat blandit.
+      Praesent efficitur faucibus risus, ac auctor purus porttitor vitae. Phasellus ornare dui nec
+      orci posuere, nec luctus mauris semper.
+      <br>
+      <br>
+      Morbi viverra, ante vel aliquet tincidunt, leo dolor pharetra quam, at semper massa orci nec
+      magna. Donec posuere nec sapien sed laoreet. Etiam cursus nunc in condimentum facilisis.
+      Etiam in tempor tortor. Vivamus faucibus egestas enim, at convallis diam pulvinar vel.
+      Cras ac orci eget nisi maximus cursus. Nunc urna libero, viverra sit amet nisl at, hendrerit
+      tempor turpis. Maecenas facilisis convallis mi vel tempor. Nullam vitae nunc leo. Cras sed
+      nisl consectetur, rhoncus sapien sit amet, tempus sapien.
+      <br>
+      <br>
+      Integer turpis erat, porttitor vitae mi faucibus, laoreet interdum tellus. Curabitur posuere
+      molestie dictum. Morbi eget congue risus, quis rhoncus quam. Suspendisse vitae hendrerit erat,
+      at posuere mi. Cras eu fermentum nunc. Sed id ante eu orci commodo volutpat non ac est.
+      Praesent ligula diam, congue eu enim scelerisque, finibus commodo lectus.
+    </div>
+    <br>
+    <br>
+    <md-input placeholder="Tab Label" [(ngModel)]="tab.label"></md-input>
+  </md-tab>
+</md-tab-group>
+
+
+<h1>Tab Group Demo - Fixed Height</h1>
+
+<md-tab-group class="demo-tab-group" style="height: 200px">
+  <md-tab *ngFor="let tab of tabs" [disabled]="tab.disabled">
     <template md-tab-label>{{tab.label}}</template>
     {{tab.content}}
     <br>
     <br>
+    <div *ngIf="tab.extraContent">
+      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nulla venenatis ante augue.
+      Phasellus volutpat neque ac dui mattis vulputate. Etiam consequat aliquam cursus.
+      In sodales pretium ultrices. Maecenas lectus est, sollicitudin consectetur felis nec,
+      feugiat ultricies mi. Aliquam erat volutpat. Nam placerat, tortor in ultrices porttitor,
+      orci enim rutrum enim, vel tempor sapien arcu a tellus. Vivamus convallis sodales ante varius
+      gravida. Curabitur a purus vel augue ultrices ultricies id a nisl. Nullam malesuada consequat
+      diam, a facilisis tortor volutpat et. Sed urna dolor, aliquet vitae posuere vulputate, euismod
+      ac lorem. Sed felis risus, pulvinar at interdum quis, vehicula sed odio. Phasellus in enim
+      venenatis, iaculis tortor eu, bibendum ante. Donec ac tellus dictum neque volutpat blandit.
+      Praesent efficitur faucibus risus, ac auctor purus porttitor vitae. Phasellus ornare dui nec
+      orci posuere, nec luctus mauris semper.
+      <br>
+      <br>
+      Morbi viverra, ante vel aliquet tincidunt, leo dolor pharetra quam, at semper massa orci nec
+      magna. Donec posuere nec sapien sed laoreet. Etiam cursus nunc in condimentum facilisis.
+      Etiam in tempor tortor. Vivamus faucibus egestas enim, at convallis diam pulvinar vel.
+      Cras ac orci eget nisi maximus cursus. Nunc urna libero, viverra sit amet nisl at, hendrerit
+      tempor turpis. Maecenas facilisis convallis mi vel tempor. Nullam vitae nunc leo. Cras sed
+      nisl consectetur, rhoncus sapien sit amet, tempus sapien.
+      <br>
+      <br>
+      Integer turpis erat, porttitor vitae mi faucibus, laoreet interdum tellus. Curabitur posuere
+      molestie dictum. Morbi eget congue risus, quis rhoncus quam. Suspendisse vitae hendrerit erat,
+      at posuere mi. Cras eu fermentum nunc. Sed id ante eu orci commodo volutpat non ac est.
+      Praesent ligula diam, congue eu enim scelerisque, finibus commodo lectus.
+    </div>
+    <br>
     <br>
     <md-input placeholder="Tab Label" [(ngModel)]="tab.label"></md-input>
   </md-tab>

src/demo-app/tabs/tabs-demo.scss

@@ -16,7 +16,7 @@
   .md-tab-header {
     background: #f9f9f9;
   }
-  .md-tab-body {
+  .md-tab-body-content {
     padding: 12px;
   }
 }

src/demo-app/tabs/tabs-demo.ts

@@ -18,9 +18,21 @@ export class TabsDemo {
   activeLinkIndex = 0;
 
   tabs = [
-    {label: 'Tab One', content: 'This is the body of the first tab'},
-    {label: 'Tab Two', content: 'This is the body of the second tab'},
-    {label: 'Tab Three', content: 'This is the body of the third tab'},
+    {
+      label: 'Tab One',
+      content: 'This is the body of the first tab'},
+    {
+      label: 'Tab Two',
+      disabled: true,
+      content: 'This is the body of the second tab'},
+    {
+      label: 'Tab Three',
+      extraContent: true,
+      content: 'This is the body of the third tab'},
+    {
+      label: 'Tab Four',
+      content: 'This is the body of the fourth tab'
+    },
   ];
 
   asyncTabs: Observable<any>;

src/lib/core/portal/portal-directives.ts

@@ -57,7 +57,9 @@ export class PortalHostDirective extends BasePortalHost implements OnDestroy {
   }
 
   set portal(p: Portal<any>) {
-    this._replaceAttachedPortal(p);
+    if (p) {
+      this._replaceAttachedPortal(p);
+    }
   }
 
   ngOnDestroy() {

src/lib/core/style/_layout-common.scss

@@ -0,0 +1,8 @@
+// This mixin ensures an element spans to fill the nearest ancestor with defined positioning.
+@mixin md-fill {
+  position: absolute;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+}

src/lib/menu/menu.scss

@@ -2,7 +2,7 @@
 // TODO(kara): animation for menu opening
 
 @import '../core/style/button-common';
-@import '../core/style/sidenav-common';
+@import '../core/style/layout-common';
 @import '../core/style/menu-common';
 
 $md-menu-vertical-padding: 8px !default;

src/lib/sidenav/sidenav.scss

@@ -1,6 +1,6 @@
 @import '../core/style/variables';
 @import '../core/style/elevation';
-@import '../core/style/sidenav-common';
+@import '../core/style/layout-common';
 
 
 // Mixin to help with defining LTR/RTL 'transform: translate3d()' values.
@@ -57,7 +57,7 @@ md-sidenav-layout {
 
   // TODO(hansl): Update this with a more robust solution.
   &[fullscreen] {
-    @include md-fullscreen();
+    @include md-fill();
 
     &.md-sidenav-opened {
       overflow: hidden;
@@ -66,7 +66,7 @@ md-sidenav-layout {
 }
 
 .md-sidenav-backdrop {
-  @include md-fullscreen();
+  @include md-fill();
 
   display: block;
 

src/lib/tabs/_tabs-common.scss

@@ -2,6 +2,8 @@
 
 $md-tab-bar-height: 48px !default;
 
+$md-tab-animation-duration: 500ms !default;
+
 // Mixin styles for labels that are contained within the tab header.
 @mixin tab-label {
   line-height: $md-tab-bar-height;
@@ -36,5 +38,5 @@ $md-tab-bar-height: 48px !default;
   position: absolute;
   bottom: 0;
   height: 2px;
-  transition: 350ms ease-out;
-}
+  transition: $md-tab-animation-duration $ease-in-out-curve-function;
+}

src/lib/tabs/tab-body.html

@@ -0,0 +1,6 @@
+<div class="md-tab-body-content"
+     [@translateTab]="_position"
+     (@translateTab.start)="_onTranslateTabStarted($event)"
+     (@translateTab.done)="_onTranslateTabComplete($event)">
+  <template portalHost></template>
+</div>

src/lib/tabs/tab-group.html

@@ -6,7 +6,7 @@
        [tabIndex]="selectedIndex == i ? 0 : -1"
        [attr.aria-controls]="_getTabContentId(i)"
        [attr.aria-selected]="selectedIndex == i"
-       [class.md-tab-active]="selectedIndex == i"
+       [class.md-tab-label-active]="selectedIndex == i"
        [class.md-tab-disabled]="tab.disabled"
        (click)="focusIndex = selectedIndex = i">
 
@@ -20,15 +20,15 @@
   </div>
   <md-ink-bar></md-ink-bar>
 </div>
-<div class="md-tab-body-wrapper">
-  <div class="md-tab-body"
-       role="tabpanel"
-       *ngFor="let tab of _tabs; let i = index"
-       [id]="_getTabContentId(i)"
-       [class.md-tab-active]="selectedIndex == i"
-       [attr.aria-labelledby]="_getTabLabelId(i)">
-    <template [ngIf]="selectedIndex == i">
-      <template [portalHost]="tab.content"></template>
-    </template>
-  </div>
+<div class="md-tab-body-wrapper" #tabBodyWrapper>
+  <md-tab-body role="tabpanel"
+               *ngFor="let tab of _tabs; let i = index"
+               [id]="_getTabContentId(i)"
+               [attr.aria-labelledby]="_getTabLabelId(i)"
+               [class.md-tab-body-active]="selectedIndex == i"
+               [md-tab-body-position]="i - selectedIndex"
+               [md-tab-body-content]="tab.content"
+               (onTabBodyCentered)="_removeTabBodyWrapperHeight()"
+               (onTabBodyCentering)="_setTabBodyWrapperHeight($event)">
+  </md-tab-body>
 </div>

src/lib/tabs/tab-group.scss

@@ -1,4 +1,5 @@
 @import '../core/style/variables';
+@import '../core/style/layout-common';
 @import 'tabs-common';
 
 :host {
@@ -32,19 +33,24 @@ md-ink-bar {
 .md-tab-body-wrapper {
   position: relative;
   overflow: hidden;
-  flex-grow: 1;
   display: flex;
+  transition: height $md-tab-animation-duration $ease-in-out-curve-function;
 }
 
 // Wraps each tab body 
-.md-tab-body {
-  display: none;
-  overflow: auto;
-  box-sizing: border-box;
-  flex-grow: 1;
-  flex-shrink: 1;
-  &.md-tab-active {
-    display: block;
+md-tab-body {
+  @include md-fill;
+  display: block;
+  overflow: hidden;
+  &.md-tab-body-active {
+    position: relative;
+    overflow-x: hidden;
+    overflow-y: auto;
+    z-index: 1;
+    flex-grow: 1;
+  }
+  :host[md-dynamic-height] &.md-tab-body-active {
+    overflow-y: hidden;
   }
 }