Move "compose" on mobile to floating action button (#6594)

* Move "compose" on mobile to floating action button

* Fix contrast on floating action button

app/javascript/mastodon/features/ui/components/columns_area.js

@@ -6,6 +6,7 @@ import ImmutablePureComponent from 'react-immutable-pure-component';
 
 import ReactSwipeableViews from 'react-swipeable-views';
 import { links, getIndex, getLink } from './tabs_bar';
+import { Link } from 'react-router-dom';
 
 import BundleContainer from '../containers/bundle_container';
 import ColumnLoading from './column_loading';
@@ -152,11 +153,19 @@ export default class ColumnsArea extends ImmutablePureComponent {
     this.pendingIndex = null;
 
     if (singleColumn) {
-      return columnIndex !== -1 ? (
+      const floatingActionButton = this.context.router.history.location.pathname === '/statuses/new' ? null : <Link key='floating-action-button' to='/statuses/new' className='floating-action-button'><i className='fa fa-pencil' /></Link>;
-        <ReactSwipeableViews index={columnIndex} onChangeIndex={this.handleSwipe} onTransitionEnd={this.handleAnimationEnd} animateTransitions={shouldAnimate} springConfig={{ duration: '400ms', delay: '0s', easeFunction: 'ease' }} style={{ height: '100%' }}>
+
+      return columnIndex !== -1 ? [
+        <ReactSwipeableViews key='content' index={columnIndex} onChangeIndex={this.handleSwipe} onTransitionEnd={this.handleAnimationEnd} animateTransitions={shouldAnimate} springConfig={{ duration: '400ms', delay: '0s', easeFunction: 'ease' }} style={{ height: '100%' }}>
           {links.map(this.renderView)}
-        </ReactSwipeableViews>
+        </ReactSwipeableViews>,
-      ) : <div className='columns-area'>{children}</div>;
+
+        floatingActionButton,
+      ] : [
+        <div className='columns-area'>{children}</div>,
+
+        floatingActionButton,
+      ];
     }
 
     return (

app/javascript/mastodon/features/ui/components/tabs_bar.js

@@ -6,7 +6,6 @@ import { debounce } from 'lodash';
 import { isUserTouching } from '../../../is_mobile';
 
 export const links = [
-  <NavLink className='tabs-bar__link primary' to='/statuses/new' data-preview-title-id='tabs_bar.compose' data-preview-icon='pencil' ><i className='fa fa-fw fa-pencil' /><FormattedMessage id='tabs_bar.compose' defaultMessage='Compose' /></NavLink>,
   <NavLink className='tabs-bar__link primary' to='/timelines/home' data-preview-title-id='column.home' data-preview-icon='home' ><i className='fa fa-fw fa-home' /><FormattedMessage id='tabs_bar.home' defaultMessage='Home' /></NavLink>,
   <NavLink className='tabs-bar__link primary' to='/notifications' data-preview-title-id='column.notifications' data-preview-icon='bell' ><i className='fa fa-fw fa-bell' /><FormattedMessage id='tabs_bar.notifications' defaultMessage='Notifications' /></NavLink>,
 

app/javascript/styles/mastodon/components.scss

@@ -1878,7 +1878,7 @@
   font-size: 14px;
   font-weight: 500;
   border-bottom: 2px solid lighten($ui-base-color, 8%);
-  transition: all 200ms linear;
+  transition: all 50ms linear;
 
   .fa {
     font-weight: 400;
@@ -1895,7 +1895,6 @@
   &:active {
     @media screen and (min-width: 631px) {
       background: lighten($ui-base-color, 14%);
-      transition: all 100ms linear;
     }
   }
 
@@ -5024,3 +5023,27 @@ noscript {
     left: 0;
   }
 }
+
+.floating-action-button {
+  position: fixed;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  width: 3.9375rem;
+  height: 3.9375rem;
+  bottom: 1.3125rem;
+  right: 1.3125rem;
+  background: darken($ui-highlight-color, 3%);
+  color: $white;
+  border-radius: 50%;
+  font-size: 21px;
+  line-height: 21px;
+  text-decoration: none;
+  box-shadow: 2px 3px 9px rgba($base-shadow-color, 0.4);
+
+  &:hover,
+  &:focus,
+  &:active {
+    background: lighten($ui-highlight-color, 7%);
+  }
+}