Add node.isCached() method

CHANGELOG.md

@@ -5,6 +5,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Not released:
 
+* Add `node.isCached()` method
+
 ## [4.0.3][2019-08-08]
 
 * Slightly changed `mousemove` event flow. It triggers for first `mouseover` event too

konva.js

@@ -8,7 +8,7 @@
    * Konva JavaScript Framework v4.0.3
    * http://konvajs.org/
    * Licensed under the MIT
-   * Date: Thu Aug 08 2019
+   * Date: Sat Aug 10 2019
    *
    * Original work Copyright (C) 2011 - 2013 by Eric Rowell (KineticJS)
    * Modified work Copyright (C) 2014 - present by Anton Lavrenov (Konva)
@@ -2759,6 +2759,15 @@
           });
           return this;
       };
+      /**
+       * determine if node is currently cached
+       * @method
+       * @name Konva.Node#isCached
+       * @returns {Boolean}
+       */
+      Node.prototype.isCached = function () {
+          return this._cache.has('canvas');
+      };
       /**
        * Return client rectangle {x, y, width, height} of node. This rectangle also include all styling (strokes, shadows, etc).
        * The rectangle position is relative to parent container.
@@ -4362,7 +4371,10 @@
        */
       Node.prototype.stopDrag = function () {
           var evt = {};
-          DD._dragElements.get(this._id).dragStopped = true;
+          var elem = DD._dragElements.get(this._id);
+          if (elem) {
+              elem.dragStopped = true;
+          }
           DD._endDragBefore(evt);
           DD._endDragAfter(evt);
       };

release.sh

@@ -56,7 +56,7 @@ echo "create new git tag"
 git tag $1 >/dev/null
 
 echo "generate documentation"
-npm start api >/dev/null
+npm run api >/dev/null
 
 
 

src/Node.ts

@@ -454,6 +454,16 @@ export abstract class Node<Config extends NodeConfig = NodeConfig> {
     return this;
   }
 
+  /**
+   * determine if node is currently cached
+   * @method
+   * @name Konva.Node#isCached
+   * @returns {Boolean}
+   */
+  isCached() {
+    return this._cache.has('canvas');
+  }
+
   abstract drawScene(
     canvas?: Canvas,
     top?: Node,
@@ -2288,7 +2298,10 @@ export abstract class Node<Config extends NodeConfig = NodeConfig> {
    */
   stopDrag() {
     var evt = {};
-    DD._dragElements.get(this._id).dragStopped = true;
+    const elem = DD._dragElements.get(this._id);
+    if (elem) {
+      elem.dragStopped = true;
+    }
     DD._endDragBefore(evt);
     DD._endDragAfter(evt);
   }