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Viewing file:     moveable.js (5.16 KB)      -rwxrwxr-x

import * as _ from '../utils/utils';

const clamp = v => Math.max(Math.min(v, 1), 0);
export default function Moveable(opt) {

    const that = {

        // Assign default values
        options: Object.assign({
            lock: null,
            onchange: () => 0,
            onstop: () => 0
        }, opt),

        _keyboard(e) {
            const {options} = that;
            const {type, key} = e;

            // Check to see if the Movable is focused and then move it based on arrow key inputs
            // For improved accessibility
            if (document.activeElement === options.wrapper) {
                const {lock} = that.options;
                const up = key === 'ArrowUp';
                const right = key === 'ArrowRight';
                const down = key === 'ArrowDown';
                const left = key === 'ArrowLeft';

                if (type === 'keydown' && (up || right || down || left)) {
                    let xm = 0;
                    let ym = 0;

                    if (lock === 'v') {
                        xm = (up || right) ? 1 : -1;
                    } else if (lock === 'h') {
                        xm = (up || right) ? -1 : 1;
                    } else {
                        ym = up ? -1 : (down ? 1 : 0);
                        xm = left ? -1 : (right ? 1 : 0);
                    }

                    that.update(
                        clamp(that.cache.x + (0.01 * xm)),
                        clamp(that.cache.y + (0.01 * ym))
                    );
                    e.preventDefault();
                } else if (key.startsWith('Arrow')) {
                    that.options.onstop();
                    e.preventDefault();
                }
            }
        },

        _tapstart(evt) {
            _.on(document, ['mouseup', 'touchend', 'touchcancel'], that._tapstop);
            _.on(document, ['mousemove', 'touchmove'], that._tapmove);

            if (evt.cancelable) {
                evt.preventDefault();
            }

            // Trigger
            that._tapmove(evt);
        },

        _tapmove(evt) {
            const {options, cache} = that;
            const {lock, element, wrapper} = options;
            const b = wrapper.getBoundingClientRect();

            let x = 0, y = 0;
            if (evt) {
                const touch = evt && evt.touches && evt.touches[0];
                x = evt ? (touch || evt).clientX : 0;
                y = evt ? (touch || evt).clientY : 0;

                // Reset to bounds
                if (x < b.left) {
                    x = b.left;
                } else if (x > b.left + b.width) {
                    x = b.left + b.width;
                }
                if (y < b.top) {
                    y = b.top;
                } else if (y > b.top + b.height) {
                    y = b.top + b.height;
                }

                // Normalize
                x -= b.left;
                y -= b.top;
            } else if (cache) {
                x = cache.x * b.width;
                y = cache.y * b.height;
            }

            if (lock !== 'h') {
                element.style.left = `calc(${x / b.width * 100}% - ${element.offsetWidth / 2}px)`;
            }

            if (lock !== 'v') {
                element.style.top = `calc(${y / b.height * 100}% - ${element.offsetHeight / 2}px)`;
            }

            that.cache = {x: x / b.width, y: y / b.height};
            const cx = clamp(x / b.width);
            const cy = clamp(y / b.height);

            switch (lock) {
                case 'v':
                    return options.onchange(cx);
                case 'h':
                    return options.onchange(cy);
                default:
                    return options.onchange(cx, cy);
            }
        },

        _tapstop() {
            that.options.onstop();
            _.off(document, ['mouseup', 'touchend', 'touchcancel'], that._tapstop);
            _.off(document, ['mousemove', 'touchmove'], that._tapmove);
        },

        trigger() {
            that._tapmove();
        },

        update(x = 0, y = 0) {
            const {left, top, width, height} = that.options.wrapper.getBoundingClientRect();

            if (that.options.lock === 'h') {
                y = x;
            }

            that._tapmove({
                clientX: left + width * x,
                clientY: top + height * y
            });
        },

        destroy() {
            const {options, _tapstart, _keyboard} = that;
            _.off(document, ['keydown', 'keyup'], _keyboard);
            _.off([options.wrapper, options.element], 'mousedown', _tapstart);
            _.off([options.wrapper, options.element], 'touchstart', _tapstart, {
                passive: false
            });
        }
    };

    // Initilize
    const {options, _tapstart, _keyboard} = that;
    _.on([options.wrapper, options.element], 'mousedown', _tapstart);
    _.on([options.wrapper, options.element], 'touchstart', _tapstart, {
        passive: false
    });

    _.on(document, ['keydown', 'keyup'], _keyboard);

    return that;
}