From c431f6a550699b466b8b975ae5a1e3143d13c8b3 Mon Sep 17 00:00:00 2001
From: nightwing <amirjanyan@gmail.com>
Date: Tue, 13 Mar 2012 22:04:45 +0400
Subject: [PATCH] add ability to draw show cursors

---
 lib/ace/layer/cursor.js | 102 ++++++++++++++++++++++++++++++----------
 1 file changed, 78 insertions(+), 24 deletions(-)

diff --git a/lib/ace/layer/cursor.js b/lib/ace/layer/cursor.js
index 5fa7644a..0fc42e86 100644
--- a/lib/ace/layer/cursor.js
+++ b/lib/ace/layer/cursor.js
@@ -47,11 +47,10 @@ var Cursor = function(parentEl) {
     this.element.className = "ace_layer ace_cursor-layer";
     parentEl.appendChild(this.element);
 
-    this.cursor = dom.createElement("div");
-    this.cursor.className = "ace_cursor ace_hidden";
-    this.element.appendChild(this.cursor);
-
     this.isVisible = false;
+
+    this.cursors = [];
+    this.cursor = this.addCursor();
 };
 
 (function() {
@@ -65,30 +64,54 @@ var Cursor = function(parentEl) {
         this.session = session;
     };
 
+    this.addCursor = function() {
+        var el = dom.createElement("div");
+        var className = "ace_cursor"
+        if (!this.isVisible)
+            className += " ace_hidden";
+        if (this.overwrite)
+            className += " ace_overwrite";
+
+        el.className = className;
+        this.element.appendChild(el);
+        this.cursors.push(el);
+        return el;
+    };
+
+    this.removeCursor = function() {
+        if (this.cursors.length > 1) {
+            var el = this.cursors.pop();
+            el.parentNode.removeChild(el)
+            return el
+        }
+    };
+
     this.hideCursor = function() {
         this.isVisible = false;
-        dom.addCssClass(this.cursor, "ace_hidden");
+        for (var i = this.cursors.length; i--; )
+            dom.addCssClass(this.cursors[i], "ace_hidden");
         clearInterval(this.blinkId);
     };
 
     this.showCursor = function() {
         this.isVisible = true;
-        dom.removeCssClass(this.cursor, "ace_hidden");
-        this.cursor.style.visibility = "visible";
+        for (var i = this.cursors.length; i--; )
+            dom.removeCssClass(this.cursors[i], "ace_hidden");
+
+        this.element.style.visibility = "";
         this.restartTimer();
     };
 
     this.restartTimer = function() {
         clearInterval(this.blinkId);
-        if (!this.isVisible) {
+        if (!this.isVisible)
             return;
-        }
 
-        var cursor = this.cursor;
+        var element = this.element;
         this.blinkId = setInterval(function() {
-            cursor.style.visibility = "hidden";
+            element.style.visibility = "hidden";
             setTimeout(function() {
-                cursor.style.visibility = "visible";
+                element.style.visibility = "visible";
             }, 400);
         }, 1000);
     };
@@ -118,25 +141,56 @@ var Cursor = function(parentEl) {
     this.update = function(config) {
         this.config = config;
 
-        this.pixelPos = this.getPixelPosition(null, true);
+        if (!this.session.selection.multiSelectMode) {
+            this.pixelPos = this.getPixelPosition(null, true);
+            var style = this.cursor.style;
+            style.left = this.pixelPos.left + "px";
+            style.top = this.pixelPos.top + "px";
+            style.width = config.characterWidth + "px";
+            style.height = config.lineHeight + "px";
 
-        this.cursor.style.left = this.pixelPos.left + "px";
-        this.cursor.style.top =  this.pixelPos.top + "px";
-        this.cursor.style.width = config.characterWidth + "px";
-        this.cursor.style.height = config.lineHeight + "px";
+            while (this.cursors.length > 1)
+                this.removeCursor();
+        } else {
+            var selections = this.session.selection.allRanges
+            var i = 0, sel, cursorIndex = 0;
 
-        var overwrite = this.session.getOverwrite()
-        if (overwrite != this.overwrite) {
-            this.overwrite = overwrite;
-            if (overwrite)
-                dom.addCssClass(this.cursor, "ace_overwrite");
-            else
-                dom.removeCssClass(this.cursor, "ace_overwrite");
+            while ((sel = selections[i]) && sel.cursor.row < config.firstRow)
+                i++;
+
+            while ((sel = selections[i]) && sel.cursor.row < config.lastRow) {
+                this.pixelPos = this.getPixelPosition(sel.cursor, true);
+
+                var style = (this.cursors[cursorIndex++] || this.addCursor()).style;
+
+                style.left = this.pixelPos.left + "px";
+                style.top =  this.pixelPos.top + "px";
+                style.width = config.characterWidth + "px";
+                style.height = config.lineHeight + "px";
+
+                i++;
+            }
+            while (cursorIndex < this.cursors.length)
+                this.removeCursor();
         }
 
+        var overwrite = this.session.getOverwrite();
+        if (overwrite != this.overwrite)
+            this.$setOverite(overwrite);
+
         this.restartTimer();
     };
 
+    this.$setOverite = function(overwrite) {
+        this.overwrite = overwrite;
+        for (var i = this.cursors.length; i--; ) {
+            if (overwrite)
+                dom.addCssClass(this.cursors[i], "ace_overwrite");
+            else
+                dom.removeCssClass(this.cursors[i], "ace_overwrite");
+        }
+    };
+
     this.destroy = function() {
         clearInterval(this.blinkId);
     }