react-selections's Introduction

React Selections

This is a library that provides a set of tools for drawing regions with cursor.

Installation

npm install --save @madappgang/react-selections

Usage

You need to specify an area for the selections to be rendered inside of. Selections can't be drawn outside the container. The package provides a container component, which you should use to render as a parent node to your selections (and other components as well).

import { Selection, SelectionContainer } from '@madappgang/react-selections';

You then simply wrap your area that you want to render selections above in the container:

const selectionArea = {
  id: 1,
  dimensions: {
    height: 150,
    width: 300
  },
  coordinates: {
    x: 100,
    y: 100
  },
};

...
<SelectionContainer>
  <Selection
    area={selectionArea}
    className="my-selection"
  />
  ...
  <AnyOtherComponent />
  ...
</SelectionContainer>
...

As you see you can render anything inside the container, it will recognize selections inside and pass them special props.

Interactive selections

If you need a selection to be draggable/resizable you need to specify it explicitly with an interactive boolean property.

<Selection interactive area={area} />

Then you have to provide a handler that is going to handle area updates.

...

constructor() {
  ...

  this.state = {
    selectionArea: { ... },
  };
}

...

handleSelectionAreaUpdate(selectionArea) {
  this.setState({ selectionArea });
}

render() {
  return (
    <SelectionContainer>
      ...
      <Selection
        interactive
        area={this.selectionArea}
        onAreaUpdate={this.handleSelectionAreaUpdate}
      />
    </SelectionContainer>
  );
}

...

...

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