Add scrollback from Equinox theme

design.css

@@ -718,6 +718,27 @@ div[mtype*=myself] {
 
 /* @end */
 
+/* @group Hidden scrollback history bar */
+#scrolling_history {
+  z-index: 400;
+  position: fixed;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  height: auto;
+  box-shadow: 0 1px 5px #777;
+  border-top: 1px solid #404040;
+  text-shadow: 1px 1px rgba(10, 10, 10, 0.7);
+  background: rgba(31, 51, 81, 0.95);
+  display: none;
+  overflow: hidden;
+}
+
+#scrolling_history .senderContainer {
+  background: rgba(31, 51, 81, .95);
+}
+/* @end */
+
 /*
 	vim: set foldmethod=marker:
 	vim: set foldmarker=@group,@end:

scripts.js

@@ -1,15 +1,95 @@
 /* Defined in: "Textual.app -> Contents -> Resources -> JavaScript -> API -> core.js" */
 
+/* Room state from Equinox */
+var rs                  = { // room state
+  nick: {
+    count: 1,
+    delete: false,
+    id: undefined,
+    nick: undefined
+  }
+};
+
+/* Taken from Equinox to determine if a message is visible */
+function isMessageInViewport(elem) {
+    'use strict';
+
+    if (!elem.getBoundingClientRect) {
+        return true;
+    }
+
+    // Have to use Math.floor() because sometimes the getBoundingClientRect().bottom is a fraction of a pixel (!!!)
+    return (Math.floor(elem.getBoundingClientRect().bottom) <= Math.floor(document.documentElement.clientHeight));
+}
+
 Textual.viewBodyDidLoad = function()
 {
     Textual.fadeOutLoadingScreen(1.00, 0.95);
 }
 
+/* Taken from Equinox to create history div */
+Textual.viewInitiated = function () {
+    'use strict';
+
+    /* When the view is loaded, create a hidden history div which we display if there is scrollback */
+    var body = document.getElementById('body_home'), div = document.createElement('div');
+    div.id = 'scrolling_history';
+    document.getElementsByTagName('body')[0].appendChild(div);
+    rs.history = div;
+
+    /* setup the scrolling event to display the hidden history if the bottom element isn't in the viewport
+     also hide the topic bar when scrolling */
+    window.onscroll = function () {
+        var line, lines;
+        var topic = document.getElementById('topic_bar');
+
+        lines = body.getElementsByClassName('line');
+        if (lines.length < 2) {
+            return;
+        }
+        line = lines[lines.length - 1];
+
+        if (isMessageInViewport(line) === false) {
+            // scrollback
+            rs.history.style.display = 'inline';
+            if (topic) { topic.style.visibility = 'hidden'; }
+        } else {
+            // at the bottom
+            rs.history.style.display = 'none';
+            if (topic) { topic.style.visibility = 'visible'; }
+        }
+    };
+};
+
 Textual.newMessagePostedToView = function(line)
 {
-    var element = document.getElementById("line-" + line);
+    'use strict';
+    var message = document.getElementById("line-" + line);
 
-	ConversationTracking.updateNicknameWithNewMessage(element);
+    ConversationTracking.updateNicknameWithNewMessage(message);
+
+    /* Added from Equinox for scroll window */
+    var clone;
+    // if it's a private message, colorize the nick and then track the state and fade away the nicks if needed
+    if (message.getAttribute('ltype') === 'privmsg' || message.getAttribute('ltype') === 'action') {
+        // Track the previous message's id
+        rs.nick.id = message.getAttribute('id');
+
+        // Copy the message into the hidden history
+        clone = message.cloneNode(true);
+        clone.removeAttribute('id');
+        rs.history.appendChild(clone);
+
+        // Remove old messages, if the history is longer than three messages
+        if (rs.history.childElementCount > 2) {
+            rs.history.removeChild(rs.history.childNodes[0]);
+
+            // Hide the first nick in the hidden history, if it's the same as the second
+            if ((rs.nick.count > 1) && (message.getAttribute('ltype') !== 'action')) {
+                rs.history.getElementsByClassName('sender')[0].style.visibility = 'hidden';
+            }
+        }
+    }
 }
 
 Textual.nicknameSingleClicked = function(e)