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/**
* @author Victor Häggqvist
* @since 1/15/16
*/
export default class Navigation {
register(lightbox) {
this.lightbox = lightbox;
lightbox.addOnStartListener(this.showNavigation.bind(this));
lightbox.addOnEndListener(this.hideNavigation.bind(this));
lightbox.addOnLoadEndListener(this.updateNavigation.bind(this));
}
showNavigation() {
this.sink = document.createElement('div');
this.sink.id = 'imagelightbox-nav-sink';
this.nav = document.createElement('div');
this.nav.id = 'imagelightbox-nav';
this.sink.appendChild(this.nav);
Array.prototype.forEach.call(this.lightbox.targets, _ => {
this.nav.appendChild(document.createElement('a'));
});
document.body.appendChild(this.sink);
let navItems = this.nav.querySelectorAll('a');
Array.prototype.forEach.call(navItems, (item, i) => {
['click', 'touchend'].forEach(name => {
item.addEventListener(name, this.navClick.bind(this, i));
})
});
// make the nav actually centered, flex center dont make it
let rect = this.nav.getBoundingClientRect();
let diff = rect.width/2;
this.nav.style.marginLeft = '-'+diff+'px';
}
updateNavigation() {
Array.prototype.forEach.call(this.nav.childNodes, n => {
n.classList.remove('active');
});
let current = Array.prototype.indexOf.call(this.lightbox.targets, this.lightbox.target);
this.nav.childNodes[current].classList.add('active');
}
hideNavigation() {
try {
document.body.removeChild(this.sink);
} catch (e) {}
};
navClick(index, e) {
e.stopPropagation();
e.cancelBubble = true;
this.lightbox.switchToIndex(index);
}
}
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