ScratchComponent

ScratchComponent is the base (super) class to all scratch elements. Defined in ScratchComponent.js, it can be instantiated like this:

const component = new ScratchComponent(shapeNameOrComponentInstance, options);

Constructor arguments

The constructor has two parameters, they are shapeNameOrComponentInstance and options (optional).

shapeNameOrComponentInstance

The shape name can be one of:

• event - Renders an event component
• function - Renders a function definition component
• statement - Renders a simple statement block
• truthyBlock - Renders a conditional component like for, while or if blocks
• truthyFalsyBlock - Renders a conditional block that has truthy and falsy fields like ifElse blocks

Every shape name is write in Camel Case. It will throw an error if the shape name is not found, but an alternative is to give another ScratchComponenet, which will duplicate even the nested components (the ones in truthy, falsy and next fields).

Options

The options object (optional) defaults to:

const options = {
    attributes: {
        class: '',
        id: '',
        style: {
            position: 'absolute', // relative or absolute
            width: '120px',
            'stroke-width': '1px', // border thickness
            'line-height': '24px', // height of description container
        },
    },
    fitting: {
        truthy: true, // female fitting used to connect to the truthy child next fitting
        falsy: true, // female fitting used to connect to the falsy child next fitting
        next: true, // male fitting used to connect to the next component
    },
    propagateClassNameToNestedElements: false,
    isPreview: false,
};

Shapes

All available shapes are shown below:

Containers

The image below shows the name and location of each container:

Containers purpose

• description - Holds the components name and parameters if any
• truthy - Holds the component to be executed when true is evaluated
• falsy - Holds the component to be executed when false is evaluated
• next - Holds the next component to be executed if any

Methods

The following methods are public:

• getDOMNode( )
• getTruthyFalsyAndNext( )
• getShapeName( )
• addTruthyChild( childComponent )
• addFalsyChild( childComponent )
• addNextComponent( nextComponent )
• removeTruthyChild( )
• removeFalsyChild( )
• removeNextComponent( )
• addResizeListener( callbackListener )
• removeResizeListener( callbackListener )

Any other method starting with an underscore is private and should not be called by code outside its class.

Events

The only supported event is the resize, which is issued when the components DOM element resizes by any reason. Then, this reference is passed back to the registered callback listener.