all files / src/ scroller.js

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/**
 * Responsible for calculating the new scroll positions
 */
import ReactDOM from 'react-dom';
import AnimateScroll from './animate-scroll';
 
class Scroller {
    constructor() {
        this._elementPanelRegister = {};
    }
 
    registerElementPanel(id, component) {
        this._elementPanelRegister[id] = component;
    }
 
    unregisterElementPanel(id) {
        delete this._elementPanelRegister[id];
    }
 
    getElementPanel(id) {
        return this._elementPanelRegister[id];
    }
 
    prepareToScroll(id) {
        const element = this._elementPanelRegister[id];
 
        if (!element) {
            throw new Error(`Could not find any component with id: ${id}`);
        }
 
        const config = element.getConfig();
        const component = ReactDOM.findDOMNode(element);
 
        const container = config.container || document.body;
 
        const componentCoords = component.getBoundingClientRect();
        const containerCoords = container.getBoundingClientRect();
 
        let scrollOffset = 0;
        if (container === document.body) {
            scrollOffset = componentCoords.top - containerCoords.top;
        } else {
            scrollOffset = componentCoords.top - containerCoords.top + container.scrollTop;
        }
 
        if (!config.animate) {
            container.scrollLeft = 0;
            container.scrollTop = scrollOffset - config.offset;
 
            if (config.events.end) {
                config.events.end(id, component);
            }
        } else {
            const animation = new AnimateScroll(config);
            animation.start(id, component, scrollOffset - config.offset);
        }
    }
}
 
export default new Scroller();