keyboard navigation, jk, e

js/keyboard-shortcuts.js

@@ -0,0 +1,85 @@
+// author: joakimoa
+// keyboard navigation option
+// v1.0
+
+// adding checkbox for turning on/off
+if (window.Options && Options.get_tab('general')) {
+	Options.extend_tab("general",
+	"<fieldset><legend> Keyboard Navigation </legend>" +
+	 ("<label class='keyboardnav' id='keyboardnav' style='padding:0px;'><input type='checkbox' /> Enable Keyboard Navigation (jk: up/down, e: expand) </label>") +
+	 "</fieldset>");
+}
+
+$('.keyboardnav').on('change', function(){
+	var setting = $(this).attr('id');
+    console.log("changed keyboardnav");
+
+	localStorage[setting] = $(this).children('input').is(':checked');
+});
+
+if (!localStorage.keyboardnav) {
+	localStorage.keyboardnav = 'false';
+}
+
+// getting locally stored setting
+function getSetting(key) {
+	return (localStorage[key] == 'true');
+}
+
+if (getSetting('keyboardnav')) $('#keyboardnav>input').prop('checked', 'checked');
+
+// loads the main function
+function loadKeyboardNav() {
+    // get arr and nav
+    var files = document.getElementsByClassName("file multifile");
+    var current_file = null;
+    var default_color = "black";
+    default_color = window.getComputedStyle(files[0], null).getPropertyValue("background-color");
+
+    var k = -1;
+    function scrollDown() {
+        if (k < files.length) {
+            k++;
+            scrollTo(files[k]);
+        }
+    }
+
+    function scrollUp() {
+        if (k > 0) {
+            k--;
+            scrollTo(files[k]);
+        }
+    }
+
+    function scrollTo(e) {
+        if (current_file !== null) {
+            current_file.style.backgroundColor = default_color;
+        }
+        current_file = e;
+        e.scrollIntoView();
+        e.style.backgroundColor = "#1D1D21";
+    }
+
+    function expandFile() {
+        files[k].getElementsByClassName("post-image")[0].click();
+    }
+
+    // input
+    window.addEventListener("keydown", checkKeyPressed, false);
+
+    function checkKeyPressed(e) {
+        if (e.keyCode == "74") {
+            scrollDown();
+        } else if (e.keyCode == "75") {
+            scrollUp();
+        } else if (e.keyCode == "69") {
+            expandFile();
+        }
+    }
+}
+
+// loads main function if checkbox toggled and in a thread
+if (getSetting('keyboardnav') && document.getElementsByClassName("thread").length === 1) {
+    console.log("test");
+    loadKeyboardNav();
+}