From beb2a433bf18fd1d474314329bd6ee8f40f5bf10 Mon Sep 17 00:00:00 2001
From: timb <timb@mb.home>
Date: Mon, 15 Feb 2010 03:35:27 -0800
Subject: attempt to fix scrolling

---
 static/js/pichat.js | 79 +++++++++++++++++++++++++++--------------------------
 1 file changed, 41 insertions(+), 38 deletions(-)

(limited to 'static/js')

diff --git a/static/js/pichat.js b/static/js/pichat.js
index d3da949..33788e2 100755
--- a/static/js/pichat.js
+++ b/static/js/pichat.js
@@ -1,24 +1,44 @@
 var cache = {}
 var pendingMessages = {}
 
+var MaxImagePosts = 40
+
 function escapeHtml(txt) {
-    if (!txt) { return ""; }
-    else { return $("<span>").text(txt).html(); }
+  if (!txt) { return ""; }
+  else { return $("<span>").text(txt).html(); }
 }
 
 function linkify(text) {
-    var URLRegex = /((\b(http\:\/\/|https\:\/\/|ftp\:\/\/)|(www\.))+(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?)/gi;
-    return text.replace(URLRegex, linkReplace);
+  LastMsgContainsImage = false
+  var URLRegex = /((\b(http\:\/\/|https\:\/\/|ftp\:\/\/)|(www\.))+(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?)/gi;
+  return text.replace(URLRegex, linkReplace);
 }
 
+// durty hack to use a global to check this... but otherwise i'd have to rewrite the String.replace function? :/
+var LastMsgContainsImage = false
 function linkReplace(match){
-    var PicRegex = /\.(jpg|jpeg|png|gif|bmp)$/i;
-    var matchWithoutParams = match.replace(/\?.*$/i, "")
-    if (PicRegex.test(matchWithoutParams)){
-        return "<a target='_blank' href='" + match + "'><img src='" + match + "'></a>"
-    } else {
-        return "<a target='_blank' href='" + match + "'>" + match + "</a>"
-    }
+  var PicRegex = /\.(jpg|jpeg|png|gif|bmp)$/i;
+  var matchWithoutParams = match.replace(/\?.*$/i, "")
+  if (PicRegex.test(matchWithoutParams)){
+    LastMsgContainsImage = true
+    return "<a target='_blank' href='" + match + "'><img src='" + match + "'></a>"
+  } else {
+    return "<a target='_blank' href='" + match + "'>" + match + "</a>"
+  }
+}
+
+var ImageMsgCount = 0
+function removeOldMessages(){
+  // don't count posts that are all text
+  if (LastMsgContainsImage) ImageMsgCount += 1;
+  while (ImageMsgCount > MaxImagePosts) {
+    var imgMsg = $(".contains-image:first")
+    if (imgMsg.length) {
+      imgMsg.prevAll().remove() // remove all text messages before the image message
+      imgMsg.remove()
+    } else break;
+    ImageMsgCount -= 1;
+  }
 }
 
 function buildMsgContent(content) {
@@ -26,13 +46,15 @@ function buildMsgContent(content) {
 }
 
 function buildMessageDiv(msg, isLoading) {
-    var nick = escapeHtml(msg.nick);
-    var msgId = !isLoading ? 'id="message-' + msg.msg_id + '"' : '';
-    var loadingClass = isLoading ? ' loading' : '';
-    return '<div class="msgDiv ' + loadingClass + '" ' + msgId  + '>'
-        + '<b><a href="/u/' + nick + ' ">' + nick + '</a>: </b>'
-        + buildMsgContent(msg.content)
-        + '</div>';
+  removeOldMessages()
+  var nick = escapeHtml(msg.nick);
+  var msgId = !isLoading ? 'id="message-' + msg.msg_id + '"' : '';
+  var loadingClass = isLoading ? ' loading' : '';
+  var containsImageClass = LastMsgContainsImage ? ' contains-image' : '';
+  return '<div class="msgDiv ' + loadingClass + containsImageClass + '" ' + msgId  + '>'
+    + '<b><a href="/u/' + nick + ' ">' + nick + '</a>: </b>'
+    + buildMsgContent(msg.content)
+    + '</div>';
 }
 
 function buildUserDiv(user) {
@@ -106,30 +128,12 @@ function ifEnter(fn) {
     };
 }
 
-/*
-function isScrolledToBottom(div) {
-    return Math.abs(div.scrollTop - (div.scrollHeight - div.offsetHeight)) <= 3;
-}
-
-function scrollToBottom(div) {
-    div.scrollTop = div.scrollHeight;
-}
-
-// Give images time to start loading before scrolling.
-// Needed until server knows size of images.
-function delayedScrollToBottom(delay) {
-    setTimeout(scrollToBottom, delay, $('#messageList')[0]);
-}
-*/
-
 function addNewMessages(msgs) {
-    //var wasScrolledToBottom = isScrolledToBottom($('#messageList')[0]);
     var msgStr = $.map(msgs, buildMessageDiv).join('');
     $('#messageList').append(msgStr);
 }
 
 function addNewMessage(msg, isLoading) {
-    //var wasScrolledToBottom = isScrolledToBottom($('#messageList')[0]);
     var msgStr = buildMessageDiv(msg, isLoading);
     var div = $(msgStr).appendTo('#messageList');
     return div;
@@ -217,7 +221,6 @@ function initChat() {
     // see /static/webcam/webcam.js
     if ('webcam' in window) webcam.init()
     
-
     setTimeout(refresh, 1000);
 }
 
@@ -297,7 +300,7 @@ function isScrolledToBottom(){
 }
 
 function scrollIfPossible(){
-  if (lastScriptedScrolledPosition == messageList.scrollTop || isScrolledToBottom())
+  if (lastScriptedScrolledPosition <= messageList.scrollTop || isScrolledToBottom())
     scrollToEnd()
 }
 
-- 
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