From a6d8d1036a1a4336cb8fde6e3c318685cf6a7226 Mon Sep 17 00:00:00 2001
From: Sorin Davidoi <sorin.davidoi@gmail.com>
Date: Thu, 8 Jun 2017 17:41:32 +0200
Subject: [PATCH] feat: Swipeable columns

---
 .../features/ui/components/columns_area.js    | 26 +++++++++++-
 .../features/ui/components/tabs_bar.js        | 40 +++++++++++++++----
 2 files changed, 56 insertions(+), 10 deletions(-)

diff --git a/app/javascript/mastodon/features/ui/components/columns_area.js b/app/javascript/mastodon/features/ui/components/columns_area.js
index 6ed8bc20d..43be34840 100644
--- a/app/javascript/mastodon/features/ui/components/columns_area.js
+++ b/app/javascript/mastodon/features/ui/components/columns_area.js
@@ -2,12 +2,14 @@ import React from 'react';
 import PropTypes from 'prop-types';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import ImmutablePureComponent from 'react-immutable-pure-component';
+import ReactSwipeable from 'react-swipeable';
 import HomeTimeline from '../../home_timeline';
 import Notifications from '../../notifications';
 import PublicTimeline from '../../public_timeline';
 import CommunityTimeline from '../../community_timeline';
 import HashtagTimeline from '../../hashtag_timeline';
 import Compose from '../../compose';
+import { getPreviousLink, getNextLink } from './tabs_bar';
 
 const componentMap = {
   'COMPOSE': Compose,
@@ -20,20 +22,40 @@ const componentMap = {
 
 class ColumnsArea extends ImmutablePureComponent {
 
+  static contextTypes = {
+    router: PropTypes.object.isRequired,
+  };
+
   static propTypes = {
     columns: ImmutablePropTypes.list.isRequired,
     singleColumn: PropTypes.bool,
     children: PropTypes.node,
   };
 
+  handleRightSwipe = () => {
+    const previousLink = getPreviousLink(this.context.router.history.location.pathname);
+
+    if (previousLink) {
+      this.context.router.history.push(previousLink);
+    }
+  }
+
+  handleLeftSwipe = () => {
+    const previousLink = getNextLink(this.context.router.history.location.pathname);
+
+    if (previousLink) {
+      this.context.router.history.push(previousLink);
+    }
+  };
+
   render () {
     const { columns, children, singleColumn } = this.props;
 
     if (singleColumn) {
       return (
-        <div className='columns-area'>
+        <ReactSwipeable onSwipedLeft={this.handleLeftSwipe} onSwipedRight={this.handleRightSwipe} className='columns-area'>
           {children}
-        </div>
+        </ReactSwipeable>
       );
     }
 
diff --git a/app/javascript/mastodon/features/ui/components/tabs_bar.js b/app/javascript/mastodon/features/ui/components/tabs_bar.js
index 265cb818b..09acee067 100644
--- a/app/javascript/mastodon/features/ui/components/tabs_bar.js
+++ b/app/javascript/mastodon/features/ui/components/tabs_bar.js
@@ -2,19 +2,43 @@ import React from 'react';
 import NavLink from 'react-router-dom/NavLink';
 import { FormattedMessage } from 'react-intl';
 
+const links = [
+  <NavLink className='tabs-bar__link primary' activeClassName='active' to='/statuses/new'><i className='fa fa-fw fa-pencil' /><FormattedMessage id='tabs_bar.compose' defaultMessage='Compose' /></NavLink>,
+  <NavLink className='tabs-bar__link primary' activeClassName='active' to='/timelines/home'><i className='fa fa-fw fa-home' /><FormattedMessage id='tabs_bar.home' defaultMessage='Home' /></NavLink>,
+  <NavLink className='tabs-bar__link primary' activeClassName='active' to='/notifications'><i className='fa fa-fw fa-bell' /><FormattedMessage id='tabs_bar.notifications' defaultMessage='Notifications' /></NavLink>,
+
+  <NavLink className='tabs-bar__link secondary' activeClassName='active' to='/timelines/public/local'><i className='fa fa-fw fa-users' /><FormattedMessage id='tabs_bar.local_timeline' defaultMessage='Local' /></NavLink>,
+  <NavLink className='tabs-bar__link secondary' activeClassName='active' exact to='/timelines/public'><i className='fa fa-fw fa-globe' /><FormattedMessage id='tabs_bar.federated_timeline' defaultMessage='Federated' /></NavLink>,
+
+  <NavLink className='tabs-bar__link primary' activeClassName='active' style={{ flexGrow: '0', flexBasis: '30px' }} to='/getting-started'><i className='fa fa-fw fa-asterisk' /></NavLink>,
+];
+
+export function getPreviousLink (path) {
+  const index = links.findIndex(link => link.props.to === path);
+
+  if (index > 0) {
+    return links[index - 1].props.to;
+  }
+
+  return null;
+};
+
+export function getNextLink (path) {
+  const index = links.findIndex(link => link.props.to === path);
+
+  if (index !== -1 && index < links.length - 1) {
+    return links[index + 1].props.to;
+  }
+
+  return null;
+};
+
 class TabsBar extends React.Component {
 
   render () {
     return (
       <div className='tabs-bar'>
-        <NavLink className='tabs-bar__link primary' activeClassName='active' to='/statuses/new'><i className='fa fa-fw fa-pencil' /><FormattedMessage id='tabs_bar.compose' defaultMessage='Compose' /></NavLink>
-        <NavLink className='tabs-bar__link primary' activeClassName='active' to='/timelines/home'><i className='fa fa-fw fa-home' /><FormattedMessage id='tabs_bar.home' defaultMessage='Home' /></NavLink>
-        <NavLink className='tabs-bar__link primary' activeClassName='active' to='/notifications'><i className='fa fa-fw fa-bell' /><FormattedMessage id='tabs_bar.notifications' defaultMessage='Notifications' /></NavLink>
-
-        <NavLink className='tabs-bar__link secondary' activeClassName='active' to='/timelines/public/local'><i className='fa fa-fw fa-users' /><FormattedMessage id='tabs_bar.local_timeline' defaultMessage='Local' /></NavLink>
-        <NavLink className='tabs-bar__link secondary' activeClassName='active' exact to='/timelines/public'><i className='fa fa-fw fa-globe' /><FormattedMessage id='tabs_bar.federated_timeline' defaultMessage='Federated' /></NavLink>
-
-        <NavLink className='tabs-bar__link primary' activeClassName='active' style={{ flexGrow: '0', flexBasis: '30px' }} to='/getting-started'><i className='fa fa-fw fa-asterisk' /></NavLink>
+        {React.Children.toArray(links)}
       </div>
     );
   }