Custom node: probs with DnD background

JGo
1

Hi again!

According to this thread I am currently creating my own custom node. I created a test application and after getting #layoutChildren right, I put my node into a palette and dragged it onto my view. What I get there is a node with two seperate backgrounds (JGoRoundRect) way apart of each other. I still can’t figure out where the second one comes from.

Please see this screenshot and code snippet below:

public class ProcessStepNode extends JGoNode {

    private JGoText myLabel;
    private JGoObject myBackground;    
    private JGoStroke myDivider;

    ...

    protected void copyChildren(JGoArea newarea, JGoCopyEnvironment env) {
        ProcessStepNode newobj = (ProcessStepNode) newarea;                                            
        super.copyChildren(newarea, env);
        
        newobj.myBackground = (JGoObject)env.get(myBackground);
        newobj.myLabel = (JGoText)env.get(myLabel);
        newobj.myDivider = (JGoStroke)env.get(myDivider);    
    }   

    ...
 }
2

Sorry, forgot the selection of the nodes. See this updated screenshot. As you can see, directly after dropping the second (and unwanted) background is outside the node’s bounding rect.

3

Does your default constructor create and add some child objects?
If so, a copy will create two sets of child objects – those created by the constructor, and those copied by JGoArea.copyChildren.
You’ll note that most JGoArea-derived classes have a default constructor that does not create child objects, and another constructor that does and/or another method for initializing the class.

4

Thanks for pointing this out. I fixed my code and everything works as it should for now.