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/* eslint-disable func-names, consistent-return, one-var, no-return-assign */
import $ from 'jquery';
import 'jquery.waitforimages';
// Width where images must fits in, for 2-up this gets divided by 2
const availWidth = 900;
const viewModes = ['two-up', 'swipe'];
export default class ImageFile {
constructor(file) {
this.file = file;
this.requestImageInfo($('.two-up.view .frame.deleted img', this.file), () =>
this.requestImageInfo($('.two-up.view .frame.added img', this.file), () => {
this.initViewModes();
// Load two-up view after images are loaded
// so that we can display the correct width and height information
const $images = $('.two-up.view img', this.file);
$images.waitForImages(() => {
this.initView('two-up');
});
}),
);
}
initViewModes() {
const viewMode = viewModes[0];
$('.view-modes', this.file).removeClass('gl-display-none');
$('.view-modes-menu', this.file).on('click', 'li', (event) => {
if (!$(event.currentTarget).hasClass('active')) {
return this.activateViewMode(event.currentTarget.className);
}
});
return this.activateViewMode(viewMode);
}
activateViewMode(viewMode) {
$('.view-modes-menu li', this.file)
.removeClass('active')
.filter(`.${viewMode}`)
.addClass('active');
$(`.view:visible:not(.${viewMode})`, this.file).addClass('gl-display-none');
$(`.view.${viewMode}`, this.file).removeClass('gl-display-none');
return this.initView(viewMode);
}
initView(viewMode) {
return this.views[viewMode].call(this);
}
// eslint-disable-next-line class-methods-use-this
initDraggable($el, padding, callback) {
let dragging = false;
const $body = $('body');
const $offsetEl = $el.parent();
const dragStart = function () {
dragging = true;
$body.css('user-select', 'none');
};
const dragStop = function () {
dragging = false;
$body.css('user-select', '');
};
const dragMove = function (e) {
const moveX = e.pageX || e.touches[0].pageX;
const left = moveX - ($offsetEl.offset().left + padding);
if (!dragging) return;
callback(e, left);
};
// eslint-disable-next-line @gitlab/no-global-event-off
$el.off('mousedown').off('touchstart').on('mousedown', dragStart).on('touchstart', dragStart);
// eslint-disable-next-line @gitlab/no-global-event-off
$body
.off('mouseup')
.off('mousemove')
.off('touchend')
.off('touchmove')
.on('mouseup', dragStop)
.on('touchend', dragStop)
.on('mousemove', dragMove)
.on('touchmove', dragMove);
}
static prepareFrames(view) {
let maxWidth = 0;
let maxHeight = 0;
$('.frame', view)
.each((index, frame) => {
const width = $(frame).width();
const height = $(frame).height();
maxWidth = width > maxWidth ? width : maxWidth;
return (maxHeight = height > maxHeight ? height : maxHeight);
})
.css({
width: maxWidth,
height: maxHeight,
});
return [maxWidth, maxHeight];
}
views = {
'two-up': function () {
return $('.two-up.view .wrap', this.file).each((index, wrap) => {
$('img', wrap).each(function () {
const currentWidth = $(this).width();
if (currentWidth > availWidth / 2) {
return $(this).width(availWidth / 2);
}
});
return this.requestImageInfo($('img', wrap), (width, height) => {
$('.image-info .meta-width', wrap).text(`${width}px`);
$('.image-info .meta-height', wrap).text(`${height}px`);
return $('.image-info', wrap).removeClass('gl-display-none');
});
});
},
swipe() {
let maxWidth = 0;
let maxHeight = 0;
return $('.swipe.view', this.file).each((index, view) => {
const ref = ImageFile.prepareFrames(view);
[maxWidth, maxHeight] = ref;
const $swipeFrame = $('.swipe-frame', view);
const $swipeWrap = $('.swipe-wrap', view);
const $swipeBar = $('.swipe-bar', view);
$swipeFrame.css({
width: maxWidth + 16,
height: maxHeight + 28,
});
$swipeWrap.css({
width: maxWidth + 1,
height: maxHeight + 2,
});
// Set swipeBar left position to match image frame
$swipeBar.css({
left: 1,
});
const wrapPadding = parseInt($swipeWrap.css('right').replace('px', ''), 10);
this.initDraggable($swipeBar, wrapPadding, (e, left) => {
if (left > 0 && left < $swipeFrame.width() - wrapPadding * 2) {
$swipeWrap.width(maxWidth + 1 - left);
$swipeBar.css('left', left);
}
});
});
},
'onion-skin': function () {
let maxHeight, maxWidth;
maxWidth = 0;
maxHeight = 0;
const dragTrackWidth = $('.drag-track', this.file).width() - $('.dragger', this.file).width();
return $('.onion-skin.view', this.file).each((index, view) => {
const ref = ImageFile.prepareFrames(view);
[maxWidth, maxHeight] = ref;
const $frame = $('.onion-skin-frame', view);
const $frameAdded = $('.frame.added', view);
const $track = $('.drag-track', view);
const $dragger = $('.dragger', $track);
$frame.css({
width: maxWidth + 16,
height: maxHeight + 28,
});
$('.swipe-wrap', view).css({
width: maxWidth + 1,
height: maxHeight + 2,
});
$dragger.css({
left: dragTrackWidth,
});
$frameAdded.css('opacity', 1);
const framePadding = parseInt($frameAdded.css('right').replace('px', ''), 10);
this.initDraggable($dragger, framePadding, (e, left) => {
const opacity = left / dragTrackWidth;
if (opacity >= 0 && opacity <= 1) {
$dragger.css('left', left);
$frameAdded.css('opacity', opacity);
}
});
});
},
};
requestImageInfo(img, callback) {
const domImg = img.get(0);
if (domImg) {
if (domImg.complete) {
return callback.call(this, domImg.naturalWidth, domImg.naturalHeight);
}
return img.on('load', () => callback.call(this, domImg.naturalWidth, domImg.naturalHeight));
}
}
}
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