Add onend callback for flow

c3.js

@@ -3944,6 +3944,7 @@
                     flowEnd = getValueOnIndex(c3.data.targets[0].values, flowIndex + flowLength),
                     orgDomain = x.domain(),
                     durationForFlow = options.flow.duration || duration,
+                    onend = options.flow.onend || function () {},
                     wait = generateWait();
 
                 // remove head data after rendered
@@ -4025,8 +4026,8 @@
                         .attr("width", __axis_rotated ? width : rectW)
                         .attr("height", __axis_rotated ? rectW : height);
 
-                        // callback here?
+                    // callback for end of flow
-
+                    onend();
                 });
             } : null);
 
@@ -4778,7 +4779,8 @@
                 flow: {
                     index: c3.data.targets[0].values[0].index,
                     length: length,
-                    duration: args.duration
+                    duration: args.duration,
+                    onend: args.onend,
                 },
                 withLegend: true
             });

htdocs/samples/api_flow.html

@@ -67,7 +67,16 @@
             ['data2', 100],
             ['data3', 200],
           ],
-          duration: 500
+          duration: 500,
+          onend: function () {
+            chart.flow({
+              columns: [
+                ['data1', 200],
+                ['data3', 100]
+              ],
+              duration: 150
+            });
+          }
         });
       }, 1000);
 
@@ -80,7 +89,7 @@
           ],
           duration: 150
         });
-      }, 2000);
+      }, 3000);
 
       setTimeout(function () {
         chart.flow({
@@ -90,7 +99,7 @@
             ['data3', 400]
           ]
         });
-      }, 3000);
+      }, 4000);
 
     </script>
   </body>