Added prev/next post controls

TODO

@@ -6,10 +6,6 @@ everything related to posts:
         - better thumbnail loading
 
     - single post view
-        - previous and next post (difficult)
-            - remember last search
-            - take care of pages
-            - add A/D hotkeys
         - editing
             - ability to loop video posts
 

public_html/css/post.css

@@ -9,6 +9,25 @@
 	border: 0;
 }
 
+#post-current-search-wrapper {
+	text-align: center;
+}
+#post-current-search {
+	margin: 0 auto 1em auto;
+	display: inline-block;
+}
+
+#post-current-search a {
+	margin: 0 2em;
+}
+#post-current-search a,
+#post-current-search div {
+	display: inline-block;
+}
+#post-current-search a:not(.enabled) {
+	color: silver;
+}
+
 #post-view-wrapper #sidebar {
 	line-height: 1.33em;
 	font-size: 90%;

public_html/index.html

@@ -89,6 +89,8 @@
 	<script type="text/javascript" src="/js/Controls/TagInput.js"></script>
 	<script type="text/javascript" src="/js/PresenterManager.js"></script>
 
+	<script type="text/javascript" src="/js/Services/PostsAroundCalculator.js"></script>
+
 	<script type="text/javascript" src="/js/Presenters/TopNavigationPresenter.js"></script>
 	<script type="text/javascript" src="/js/Presenters/PagerPresenter.js"></script>
 	<script type="text/javascript" src="/js/Presenters/MessagePresenter.js"></script>

public_html/js/Keyboard.js

@@ -22,10 +22,15 @@ App.Keyboard = function(mousetrap) {
 		mousetrap.reset();
 	}
 
+	function unbind(key) {
+		mousetrap.unbind(key);
+	}
+
 	return {
 		keydown: keydown,
 		keyup: keyup,
 		reset: reset,
+		unbind: unbind,
 	};
 };
 

public_html/js/Pager.js

@@ -9,6 +9,7 @@ App.Pager = function(
 	var pageNumber;
 	var searchParams;
 	var url;
+	var cache = {};
 
 	function init(args) {
 		url = args.url;
@@ -55,7 +56,7 @@ App.Pager = function(
 
 	function retrieve() {
 		return promise.make(function(resolve, reject) {
-			promise.wait(api.get(url, _.extend({}, searchParams, {page: pageNumber})))
+			promise.wait(api.get(url, _.extend({page: pageNumber}, searchParams)))
 				.then(function(response) {
 					var pageSize = response.json.pageSize;
 					var totalRecords = response.json.totalRecords;
@@ -71,6 +72,27 @@ App.Pager = function(
 		});
 	}
 
+	function retrieveCached() {
+		return promise.make(function(resolve, reject) {
+			var cacheKey = JSON.stringify(_.extend({}, searchParams, {url: url, page: getPage()}));
+			if (cacheKey in cache) {
+				resolve.apply(this, cache[cacheKey]);
+			} else {
+				promise.wait(retrieve())
+					.then(function() {
+						cache[cacheKey] = arguments;
+						resolve.apply(this, arguments);
+					}).fail(function() {
+						reject.apply(this, arguments);
+					});
+			}
+		});
+	}
+
+	function resetCache() {
+		cache = {};
+	}
+
 	function getVisiblePages() {
 		var pages = [1, totalPages || 1];
 		var pagesAroundCurrent = 2;
@@ -100,7 +122,9 @@ App.Pager = function(
 		getSearchParams: getSearchParams,
 		setSearchParams: setSearchParams,
 		retrieve: retrieve,
+		retrieveCached: retrieveCached,
 		getVisiblePages: getVisiblePages,
+		resetCache: resetCache,
 	};
 
 };

public_html/js/Presenters/PostListPresenter.js

@@ -24,6 +24,7 @@ App.Presenters.PostListPresenter = function(
 		topNavigationPresenter.select('posts');
 		topNavigationPresenter.changeTitle('Posts');
 		searchArgs = util.parseComplexRouteArgs(args.searchArgs);
+		searchArgs.page = parseInt(searchArgs.page) || 1;
 
 		promise.wait(
 				util.promiseTemplate('post-list'),
@@ -93,6 +94,7 @@ App.Presenters.PostListPresenter = function(
 
 		_.each(posts, function(post) {
 			$target.append(jQuery('<li>' + itemTemplate({
+				searchArgs: searchArgs,
 				post: post,
 			}) + '</li>'));
 		});

public_html/js/Presenters/PostPresenter.js

@@ -11,6 +11,7 @@ App.Presenters.PostPresenter = function(
 	router,
 	keyboard,
 	presenterManager,
+	postsAroundCalculator,
 	postCommentListPresenter,
 	topNavigationPresenter,
 	messagePresenter) {
@@ -23,11 +24,13 @@ App.Presenters.PostPresenter = function(
 	var postContentTemplate;
 	var historyTemplate;
 
+	var postNameOrId;
+	var searchArgs;
+
 	var post;
 	var postScore;
 	var postFavorites;
 	var postHistory;
-	var postNameOrId;
 
 	var privileges = {};
 	var editPrivileges = {};
@@ -40,6 +43,7 @@ App.Presenters.PostPresenter = function(
 
 	function init(args, loaded) {
 		topNavigationPresenter.select('posts');
+		postsAroundCalculator.resetCache();
 
 		privileges.canDeletePosts = auth.hasPrivilege(auth.privileges.deletePosts);
 		privileges.canFeaturePosts = auth.hasPrivilege(auth.privileges.featurePosts);
@@ -76,6 +80,9 @@ App.Presenters.PostPresenter = function(
 	function reinit(args, loaded) {
 		postNameOrId = args.postNameOrId;
 
+		searchArgs = util.parseComplexRouteArgs(args.searchArgs);
+		searchArgs.page = parseInt(searchArgs.page) || 1;
+
 		promise.wait(refreshPost())
 			.then(function() {
 				topNavigationPresenter.changeTitle('@' + post.id);
@@ -84,6 +91,39 @@ App.Presenters.PostPresenter = function(
 			}).fail(loaded);
 	}
 
+	function attachLinksToPostsAround() {
+		var searchParams = {query: searchArgs.query, order: searchArgs.order};
+		promise.wait(postsAroundCalculator.getLinksToPostsAround(searchParams, searchArgs.page, post.id))
+			.then(function(nextPostUrl, prevPostUrl) {
+				var $prevPost = $el.find('#post-current-search .right a');
+				var $nextPost = $el.find('#post-current-search .left a');
+
+				if (nextPostUrl) {
+					$nextPost.addClass('enabled');
+					$nextPost.attr('href', nextPostUrl);
+					keyboard.keyup('a', function() {
+						router.navigate(nextPostUrl);
+					});
+				} else {
+					$nextPost.removeClass('enabled');
+					$nextPost.removeAttr('href');
+					keyboard.unbind('a');
+				}
+
+				if (prevPostUrl) {
+					$prevPost.addClass('enabled');
+					$prevPost.attr('href', prevPostUrl);
+					keyboard.keyup('d', function() {
+						router.navigate(prevPostUrl);
+					});
+				} else {
+					$prevPost.removeClass('enabled');
+					$prevPost.removeAttr('href');
+					keyboard.unbind('d');
+				}
+			});
+	}
+
 	function refreshPost() {
 		return promise.make(function(resolve, reject) {
 			promise.wait(api.get('/posts/' + postNameOrId))
@@ -128,6 +168,8 @@ App.Presenters.PostPresenter = function(
 		presenterManager.initPresenters([
 			[postCommentListPresenter, _.extend({post: post}, {$target: $el.find('#post-comments-target')})]],
 			function() { });
+
+		attachLinksToPostsAround();
 	}
 
 	function renderSidebar() {
@@ -137,6 +179,7 @@ App.Presenters.PostPresenter = function(
 
 	function renderPostTemplate() {
 		return postTemplate({
+			searchArgs: searchArgs,
 			post: post,
 			ownScore: postScore,
 			postFavorites: postFavorites,
@@ -370,6 +413,7 @@ App.DI.register('postPresenter', [
 	'router',
 	'keyboard',
 	'presenterManager',
+	'postsAroundCalculator',
 	'postCommentListPresenter',
 	'topNavigationPresenter',
 	'messagePresenter'],

public_html/js/Presenters/UserListPresenter.js

@@ -47,6 +47,7 @@ App.Presenters.UserListPresenter = function(
 
 		var searchArgs = util.parseComplexRouteArgs(args.searchArgs);
 		searchArgs.order = searchArgs.order || 'name,asc';
+		searchArgs.page = parseInt(searchArgs.page) || 1;
 		updateActiveOrder(searchArgs.order);
 
 		pagerPresenter.reinit({

public_html/js/Router.js

@@ -39,7 +39,7 @@ App.Router = function(pathJs, _, jQuery, promise, util, appState, presenterManag
 		inject('#/users(/:searchArgs)', 'userListPresenter');
 		inject('#/user/:userName(/:tab)', 'userPresenter');
 		inject('#/posts(/:searchArgs)', 'postListPresenter');
-		inject('#/post(/:postNameOrId)', 'postPresenter');
+		inject('#/post(/:postNameOrId)(/:searchArgs)', 'postPresenter');
 		inject('#/comments(/:searchArgs)', 'globalCommentListPresenter');
 		inject('#/tags(/:searchArgs)', 'tagListPresenter');
 		inject('#/help', 'helpPresenter');

public_html/js/Services/PostsAroundCalculator.js

@@ -0,0 +1,70 @@
+var App = App || {};
+App.Services = App.Services || {};
+
+App.Services.PostsAroundCalculator = function(_, promise, util, pager) {
+
+	pager.init({url: '/posts'});
+
+	function resetCache() {
+		pager.resetCache();
+	}
+
+	function getLinksToPostsAround(searchParams, page, postId) {
+		return promise.make(function(resolve, reject) {
+			pager.setSearchParams(searchParams);
+			pager.setPage(page);
+			promise.wait(pager.retrieveCached())
+				.then(function(response) {
+					var postIds = _.pluck(response.entities, 'id');
+					var position = _.indexOf(postIds, postId);
+
+					if (position === -1) {
+						resolve(null, null);
+					}
+
+					promise.wait(
+							getLinkToPostAround(postIds, position, page, -1),
+							getLinkToPostAround(postIds, position, page, 1))
+						.then(function(nextPostUrl, prevPostUrl) {
+							resolve(nextPostUrl, prevPostUrl);
+						});
+				});
+		});
+	}
+
+	function getLinkToPostAround(postIds, position, page, direction) {
+		return promise.make(function(resolve, reject) {
+			if (position + direction >= 0 && position + direction < postIds.length) {
+				var url = util.compileComplexRouteArgs(
+					'#/post/' + postIds[position + direction],
+					_.extend({page: page}, pager.getSearchParams()));
+				resolve(url);
+			} else if (page + direction >= 1) {
+				pager.setPage(page + direction);
+				promise.wait(pager.retrieveCached()).then(function(response) {
+					if (response.entities.length) {
+						var post = direction === - 1 ?
+							_.last(response.entities) :
+							_.first(response.entities);
+
+						var url = util.compileComplexRouteArgs(
+							'#/post/' + post.id,
+							_.extend({page: page + direction}, pager.getSearchParams()));
+						resolve(url);
+					} else {
+						resolve(null);
+					}
+				});
+			} else {
+				resolve(null);
+			}
+		});
+	}
+
+	return {
+		resetCache: resetCache,
+		getLinksToPostsAround: getLinksToPostsAround,
+	};
+};
+
+App.DI.register('postsAroundCalculator', ['_', 'promise', 'util', 'pager'], App.Services.PostsAroundCalculator);

public_html/templates/post-list-item.tpl

@@ -1,7 +1,11 @@
 <div class="post-small post-type-<%= post.contentType %> ">
 	<a class="link"
-		title="<%= _.map(post.tags, function(tag) { return '#' + tag.name; }).join(', ') %>"
-		href="#/post/<%= post.id %>">
+		<% if (typeof(searchArgs) !== 'undefined') { %>
+			href="#/post/<%= post.id %>/query=<%= searchArgs.query %>;order=<%= searchArgs.order %>;page=<%= searchArgs.page %>"
+		<% } else { %>
+			href="#/post/<%= post.id %>"
+		<% } %>
+		title="<%= _.map(post.tags, function(tag) { return '#' + tag.name; }).join(', ') %>">
 
 		<img class="thumb" src="/data/thumbnails/160x160/posts/<%= post.name %>" alt="<%= post.idMarkdown %>"/>
 

public_html/templates/post.tpl

@@ -1,5 +1,29 @@
 <% var permaLink = (window.location.origin + '/' + window.location.pathname + '/data/posts/' + post.name).replace(/([^:])\/+/g, '$1/') %>
 
+<div id="post-current-search-wrapper">
+	<div id="post-current-search">
+		<div class="left">
+			<a class="enabled">
+				<i class="fa fa-chevron-left"></i>
+				Next
+			</a>
+		</div>
+
+		<div class="search">
+			<a href="#/posts/query=<%= searchArgs.query %>;order=<%= searchArgs.order %>">
+				Current search: <%= searchArgs.query || '-' %>
+			</a>
+		</div>
+
+		<div class="right">
+			<a class="enabled">
+				Previous
+				<i class="fa fa-chevron-right"></i>
+			</a>
+		</div>
+	</div>
+</div>
+
 <div id="post-view-wrapper">
 	<div id="sidebar">
 		<ul class="essential">