Image hover backported from 8chan X

js/image-hover.js

@@ -0,0 +1,186 @@
+/* image-hover.js 
+ * This script is copied almost verbatim from https://github.com/Pashe/8chanX/blob/2-0/8chan-x.user.js
+ * All I did was remove the sprintf dependency and integrate it into 8chan's Options as opposed to Pashe's.
+ * I also changed initHover() to also bind on new_post.
+ * Thanks Pashe for using WTFPL.
+ */
+
+if (active_page === "catalog" || active_page === "thread" || active_page === "index") {
+$(document).on('ready', function(){
+
+if (window.Options && Options.get_tab('general')) {
+	Options.extend_tab("general", 
+	"<fieldset><legend>Image hover</legend>"
+	+ ("<label class='image-hover' id='imageHover'><input type='checkbox' /> "+_('Image hover')+"</label>")
+	+ ("<label class='image-hover' id='catalogImageHover'><input type='checkbox' /> "+_('Image hover on catalog')+"</label>")
+	+ ("<label class='image-hover' id='imageHoverFollowCursor'><input type='checkbox' /> "+_('Image hover should follow cursor')+"</label>")
+	+ "</fieldset>");
+}
+
+$('.image-hover').on('change', function(){
+	var setting = $(this).attr('id');
+
+	localStorage[setting] = $(this).children('input').is(':checked');
+});
+
+if (!localStorage.imageHover || !localStorage.catalogImageHover || !localStorage.imageHoverFollowCursor) {
+	localStorage.imageHover = 'false';
+	localStorage.catalogImageHover = 'false';
+	localStorage.imageHoverFollowCursor = 'false';
+}
+
+if (getSetting('imageHover')) $('#imageHover>input').prop('checked', 'checked');
+if (getSetting('catalogImageHover')) $('#catalogImageHover>input').prop('checked', 'checked');
+if (getSetting('imageHoverFollowCursor')) $('#imageHoverFollowCursor>input').prop('checked', 'checked');
+
+function getFileExtension(filename) { //Pashe, WTFPL
+	if (filename.match(/\.([a-z0-9]+)(&loop.*)?$/i) !== null) {
+		return filename.match(/\.([a-z0-9]+)(&loop.*)?$/i)[1];
+	} else if (filename.match(/https?:\/\/(www\.)?youtube.com/)) {
+		return 'Youtube';
+	} else {
+		return "unknown: " + filename;
+	}
+}
+
+function isImage(fileExtension) { //Pashe, WTFPL
+	return ($.inArray(fileExtension, ["jpg", "jpeg", "gif", "png"]) !== -1);
+}
+
+function isVideo(fileExtension) { //Pashe, WTFPL
+	return ($.inArray(fileExtension, ["webm", "mp4"]) !== -1);
+}
+
+function isOnCatalog() {
+	return window.active_page === "catalog";
+}
+
+function isOnThread() {
+	return window.active_page === "thread";
+}
+
+function getSetting(key) {
+	return (localStorage[key] == 'true');
+}
+
+function initImageHover() { //Pashe, influenced by tux, et al, WTFPL
+	if (!getSetting("imageHover") && !getSetting("catalogImageHover")) {return;}
+	
+	var selectors = [];
+	
+	if (getSetting("imageHover")) {selectors.push("img.post-image", "canvas.post-image");}
+	if (getSetting("catalogImageHover") && isOnCatalog()) {
+		selectors.push(".thread-image");
+		$(".theme-catalog div.thread").css("position", "inherit");
+	}
+	
+	function bindEvents(el) {
+		$(el).find(selectors.join(", ")).each(function () {
+			if ($(this).parent().data("expanded")) {return;}
+			
+			var $this = $(this);
+			
+			$this.on("mousemove", imageHoverStart);
+			$this.on("mouseout",  imageHoverEnd);
+			$this.on("click",     imageHoverEnd);
+		});
+	}
+
+	bindEvents(document.body);
+	$(document).on('new_post', function(e, post) {
+		bindEvents(post);
+	});
+}
+
+function imageHoverStart(e) { //Pashe, anonish, WTFPL
+	var hoverImage = $("#chx_hoverImage");
+	
+	if (hoverImage.length) {
+		if (getSetting("imageHoverFollowCursor")) {
+			var scrollTop = $(window).scrollTop();
+			var imgY = e.pageY;
+			var imgTop = imgY;
+			var windowWidth = $(window).width();
+			var imgWidth = hoverImage.width() + e.pageX;
+			
+			if (imgY < scrollTop + 15) {
+				imgTop = scrollTop;
+			} else if (imgY > scrollTop + $(window).height() - hoverImage.height() - 15) {
+				imgTop = scrollTop + $(window).height() - hoverImage.height() - 15;
+			}
+			
+			if (imgWidth > windowWidth) {
+				hoverImage.css({
+					'left': (e.pageX + (windowWidth - imgWidth)),
+					'top' : imgTop,
+				});
+			} else {
+				hoverImage.css({
+					'left': e.pageX,
+					'top' : imgTop,
+				});
+			}
+			
+			hoverImage.appendTo($("body"));
+		}
+		
+		return;
+	}
+	
+	var $this = $(this);
+	
+	var fullUrl;
+	if ($this.parent().attr("href").match("src")) {
+		fullUrl = $this.parent().attr("href");
+	} else if (isOnCatalog()) {
+		$this.css("cursor", "progress");
+		fullUrl = $this.attr("src");
+		$.ajax(($this.parent().attr("href").replace(/\.html$/, ".json")), {
+			success: function (result) {
+				$this.css("cursor", "unset");
+				fullUrl = result.posts[0].tim + result.posts[0].ext;
+				if (!isImage(getFileExtension(fullUrl))) {return;}
+				$("#chx_hoverImage").attr("src", "/" + thisBoard + "/" + fullUrl);
+				$("#chx_hoverImage").on("load", function() {$this.css("cursor", "none")});
+			},
+			async: true,
+			cache: true
+		});
+	}
+	
+	if (isVideo(getFileExtension(fullUrl))) {return;}
+	
+	hoverImage = $('<img id="chx_hoverImage" src="'+fullUrl+'" />');
+	if (getSetting("imageHoverFollowCursor")) {
+		hoverImage.css({
+			"position"      : "absolute",
+			"z-index"       : 101,
+			"pointer-events": "none",
+			"max-width"     : $(window).width(),
+			"max-height"    : $(window).height(),
+			'left'          : e.pageX,
+			'top'           : imgTop,
+		});
+	} else {
+		hoverImage.css({
+			"position"      : "fixed",
+			"top"           : 0,
+			"right"         : 0,
+			"z-index"       : 101,
+			"pointer-events": "none",
+			"max-width"     : "100%",
+			"max-height"    : "100%",
+		});
+	}
+	hoverImage.appendTo($("body"));
+	if (isOnThread()) {$this.css("cursor", "none");}
+}
+
+function imageHoverEnd() { //Pashe, WTFPL
+	$("#chx_hoverImage").remove();
+}
+
+initImageHover();
+});
+}
+