Add Tootip to notebook.

When user press '(' and nothing for 1200ms, 'object_info_request' sent to
	the kernel. Then tooltip with 'definition' and beggining of 'docstring'
	 shown to the user if non empty response.

	Unlike Completion <select> , <div> is not focusable so event handled in main
	cell event handeling function

	Add some CSS3 that most browser with websocket should support.

IPython/frontend/html/notebook/static/css/notebook.css

@@ -321,7 +321,7 @@ div.text_cell_render {
 .ansigrey {color: grey;}
 .ansibold {font-weight: bold;}
 
-.completions {
+.completions , .tooltip{
     position: absolute;
     z-index: 10;
     overflow: auto;
@@ -337,6 +337,36 @@ div.text_cell_render {
     font-family: monospace;
 }
 
+@-moz-keyframes fadeIn {
+    from {opacity:0;}
+    to {opacity:1;}
+}
+
+@-webkit-keyframes fadeIn {
+    from {opacity:0;}
+    to {opacity:1;}
+}
+
+@keyframes fadeIn {
+    from {opacity:0;}
+    to {opacity:1;}
+}
+
+
+.tooltip{
+	border-radius: 0px 10px 10px 10px;
+    box-shadow: 3px 3px 5px #999;
+    -webkit-animation: fadeIn 200ms;
+    -moz-animation: fadeIn 200ms;
+    animation: fadeIn 200ms;
+    vertical-align: middle;
+    background: #FDFDD8;
+    outline: none;
+    padding: 3px;
+    margin: 0px;
+    font-family: monospace;
+}
+
 @media print {
     body { overflow: visible !important; }
     .ui-widget-content { border: 0px; }

IPython/frontend/html/notebook/static/js/codecell.js

@@ -53,9 +53,29 @@ var IPython = (function (IPython) {
         // handlers and is used to provide custom key handling. Its return
         // value is used to determine if CodeMirror should ignore the event:
         // true = ignore, false = don't ignore.
+
+        // whatever key is pressed, first, cancel the tooltip request before
+        // they are sent, and remove tooltip if any
+        if(event.type === 'keydown' && this.tooltip_timeout != null){
+            CodeCell.prototype.remove_and_cancell_tooltip(this.tooltip_timeout);
+            this.tooltip_timeout=null;
+        }
         if (event.keyCode === 13 && (event.shiftKey || event.ctrlKey)) {
             // Always ignore shift-enter in CodeMirror as we handle it.
             return true;
+        }else if (event.keyCode === 53 && event.type === 'keydown') {
+            var cursor = editor.getCursor();
+            var pre_cursor = editor.getRange({line:cursor.line,ch:0},cursor).trim();
+            if (pre_cursor === "") {
+                // don't do anything if line beggin with '('
+            } else {
+                var that = this;
+                // Will set a timer to request tooltip in 1200ms
+                this.tooltip_timeout = setTimeout(function(){
+                        IPython.notebook.request_tool_tip(that, pre_cursor)
+                    },1200);
+            }
+
         } else if (event.keyCode === 9 && event.type == 'keydown') {
             // Tab completion.
             var cur = editor.getCursor();
@@ -108,6 +128,39 @@ var IPython = (function (IPython) {
         };
     };
 
+    CodeCell.prototype.remove_and_cancell_tooltip = function(timeout)
+    {
+        // note that we don't handle closing directly inside the calltip
+        // as in the completer, because it is not focusable, so won't
+        // get the event.
+        clearTimeout(timeout);
+        $('#tooltip').remove();
+    }
+
+    CodeCell.prototype.finish_tooltip = function (defstring,docstring) {
+        shortened = function(string){
+            if(string.length > 200){
+                return string.trim().substring(0,197)+'...';
+            } else { return string.trim() }
+        }
+
+        var that = this;
+        var tooltip = $('<div/>').attr('id', 'tooltip').addClass('tooltip');
+        if(defstring){
+            defstring_html= $('<pre/>').html(utils.fixConsole(defstring));
+            tooltip.append(defstring_html);
+        }
+        tooltip.append($('<pre/>').html(utils.fixConsole(shortened(docstring))));
+        var pos = this.code_mirror.cursorCoords();
+        tooltip.css('left',pos.x+'px');
+        tooltip.css('top',pos.yBot+'px');
+        $('body').append(tooltip);
+
+        // issues with cross-closing if multiple tooltip in less than 5sec
+        // keep it comented for now
+        // setTimeout(CodeCell.prototype.remove_and_cancell_tooltip, 5000);
+    };
+
 
     CodeCell.prototype.finish_completing = function (matched_text, matches) {
         // console.log("Got matches", matched_text, matches);

IPython/frontend/html/notebook/static/js/kernel.js

@@ -170,6 +170,15 @@ var IPython = (function (IPython) {
         };
     };
 
+    Kernel.prototype.object_info_request = function (objname) {
+        var content = {
+            oname : objname.toString(),
+        };
+        var msg = this.get_msg("object_info_request", content);
+        this.shell_channel.send(JSON.stringify(msg));
+        return msg.header.msg_id;
+    }
+
     Kernel.prototype.execute = function (code) {
         var content = {
             code : code,

IPython/frontend/html/notebook/static/js/notebook.js

@@ -700,14 +700,29 @@ var IPython = (function (IPython) {
             this.dirty = true;
         } else if (msg_type === "complete_reply") {
             cell.finish_completing(content.matched_text, content.matches);
-        };
+        } else if (msg_type === "object_info_reply"){
-        var payload = content.payload || [];
+            //console.log('back from object_info_request : ')
-        this.handle_payload(cell, payload);
+            rep = reply.content;
+            if(rep.found)
+            {
+                console.log("object as been found");
+                cell.finish_tooltip(rep.definition,rep.docstring);
+            }
+        } else {
+          //console.log("unknown reply:"+msg_type);
+        }
+        // when having a rely from object_info_reply,
+        // no payload so no nned to handle it
+        if(typeof(content.payload)!='undefined') {
+            var payload = content.payload || [];
+            this.handle_payload(cell, payload);
+        }
     };
 
 
     Notebook.prototype.handle_payload = function (cell, payload) {
         var l = payload.length;
+        console.log(payload);
         for (var i=0; i<l; i++) {
             if (payload[i].source === 'IPython.zmq.page.page') {
                 if (payload[i].text.trim() !== '') {
@@ -868,6 +883,14 @@ var IPython = (function (IPython) {
     };
 
 
+    Notebook.prototype.request_tool_tip = function (cell,func) {
+        // select last part of expression
+        var re = /[a-zA-Z._]+$/g;
+        var lastpart=re.exec(func);
+        var msg_id = this.kernel.object_info_request(lastpart);
+        this.msg_cell_map[msg_id] = cell.cell_id;
+    };
+
     Notebook.prototype.complete_cell = function (cell, line, cursor_pos) {
         var msg_id = this.kernel.complete(line, cursor_pos);
         this.msg_cell_map[msg_id] = cell.cell_id;