1 files changed, 85 insertions, 0 deletions
diff --git a/assets/js/irssi.js b/assets/js/irssi.js
index eb088aa..460f76a 100644
--- a/assets/js/irssi.js
+++ b/assets/js/irssi.js
@@ -10,3 +10,88 @@ function initMenu() {
 document.addEventListener("DOMContentLoaded", function(event) {
     initMenu();
 });
+
+// http://stackoverflow.com/a/34003331
+if (Element.prototype.scrollIntoView && !Element.prototype.scrollIntoViewIfNeeded) {
+    Element.prototype.scrollIntoViewIfNeeded = function (centerIfNeeded) {
+        function withinBounds(value, min, max, extent) {
+            if (false === centerIfNeeded || max <= value + extent && value <= min + extent) {
+                return Math.min(max, Math.max(min, value));
+            } else {
+                return (min + max) / 2;
+            }
+        }
+
+        function makeArea(left, top, width, height) {
+            return  { "left": left, "top": top, "width": width, "height": height
+                    , "right": left + width, "bottom": top + height
+                    , "translate":
+                        function (x, y) {
+                            return makeArea(x + left, y + top, width, height);
+                        }
+                    , "relativeFromTo":
+                        function (lhs, rhs) {
+                            var newLeft = left, newTop = top;
+                            lhs = lhs.offsetParent;
+                            rhs = rhs.offsetParent;
+                            if (lhs === rhs) {
+                                return area;
+                            }
+                            for (; lhs; lhs = lhs.offsetParent) {
+                                newLeft += lhs.offsetLeft + lhs.clientLeft;
+                                newTop += lhs.offsetTop + lhs.clientTop;
+                            }
+                            for (; rhs; rhs = rhs.offsetParent) {
+                                newLeft -= rhs.offsetLeft + rhs.clientLeft;
+                                newTop -= rhs.offsetTop + rhs.clientTop;
+                            }
+                            return makeArea(newLeft, newTop, width, height);
+                        }
+                    };
+        }
+
+        var parent, elem = this, area = makeArea(
+            this.offsetLeft, this.offsetTop,
+            this.offsetWidth, this.offsetHeight);
+        while ((parent = elem.parentNode) instanceof HTMLElement) {
+            var clientLeft = parent.offsetLeft + parent.clientLeft;
+            var clientTop = parent.offsetTop + parent.clientTop;
+
+            // Make area relative to parent's client area.
+            area = area.
+                relativeFromTo(elem, parent).
+                translate(-clientLeft, -clientTop);
+
+            parent.scrollLeft = withinBounds(
+                parent.scrollLeft,
+                area.right - parent.clientWidth, area.left,
+                parent.clientWidth);
+
+            parent.scrollTop = withinBounds(
+                parent.scrollTop,
+                area.bottom - parent.clientHeight, area.top,
+                parent.clientHeight);
+
+            // Determine actual scroll amount by reading back scroll properties.
+            area = area.translate(clientLeft - parent.scrollLeft,
+                                  clientTop - parent.scrollTop);
+            elem = parent;
+        }
+    };
+}
+
+function chooseDlc(e, name) {
+    var e1 = document.getElementsByClassName('about-' + name)[0];
+
+    var ec = e.control;
+    var checked = ec ? ec.checked : null;
+    window.setTimeout(function() {
+	if (e1 && e1.scrollIntoViewIfNeeded) {
+	    e1.scrollIntoViewIfNeeded(false);
+	}
+	if (checked) {
+	    ec.checked = false;
+	}
+    }, 0);
+    return true;
+}