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/* eslint-disable func-names, space-before-function-paren, no-var, prefer-rest-params, wrap-iife, max-len, one-var, one-var-declaration-per-line, quotes, prefer-template, newline-per-chained-call, comma-dangle, new-cap, no-else-return, consistent-return */
/* global notes */
/* Developer beware! Do not add logic to showButton or hideButton
* that will force a reflow. Doing so will create a signficant performance
* bottleneck for pages with large diffs. For a comprehensive list of what
* causes reflows, visit https://gist.github.com/paulirish/5d52fb081b3570c81e3a
*/
const LINE_NUMBER_CLASS = 'diff-line-num';
const LINE_CONTENT_CLASS = 'line_content';
const UNFOLDABLE_LINE_CLASS = 'js-unfold';
const EMPTY_CELL_CLASS = 'empty-cell';
const OLD_LINE_CLASS = 'old_line';
const LINE_COLUMN_CLASSES = `.${LINE_NUMBER_CLASS}, .line_content`;
export default {
init($diffFile) {
const userCanCreateNote = $diffFile && $diffFile.parent().data('can-create-note') != null;
if (userCanCreateNote) {
$diffFile.on('mouseover', LINE_COLUMN_CLASSES, e => this.showButton(e))
.on('mouseleave', LINE_COLUMN_CLASSES, e => this.hideButton(e));
}
},
showButton(e) {
const buttonParentElement = this.getButtonParent(e.currentTarget);
if (!this.validateButtonParent(buttonParentElement)) return;
buttonParentElement.classList.add('is-over');
buttonParentElement.nextElementSibling.classList.add('is-over');
},
hideButton(e) {
const buttonParentElement = this.getButtonParent(e.currentTarget);
buttonParentElement.classList.remove('is-over');
buttonParentElement.nextElementSibling.classList.remove('is-over');
},
getButtonParent(hoveredElement) {
if (!notes.isParallelView()) {
if (hoveredElement.classList.contains(OLD_LINE_CLASS)) {
return hoveredElement;
}
return hoveredElement.parentNode.querySelector(`.${OLD_LINE_CLASS}`);
} else {
if (hoveredElement.classList.contains(LINE_NUMBER_CLASS)) {
return hoveredElement;
}
return hoveredElement.previousElementSibling;
}
},
validateButtonParent(buttonParentElement) {
return !buttonParentElement.classList.contains(EMPTY_CELL_CLASS) && !buttonParentElement.classList.contains(UNFOLDABLE_LINE_CLASS);
},
};
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