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// followlines.js - JavaScript utilities for followlines UI
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//
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// Copyright 2017 Logilab SA <contact@logilab.fr>
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//
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// This software may be used and distributed according to the terms of the
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// GNU General Public License version 2 or any later version.
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//** Install event listeners for line block selection and followlines action */
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document.addEventListener('DOMContentLoaded', function() {
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var sourcelines = document.getElementsByClassName('sourcelines')[0];
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if (typeof sourcelines === 'undefined') {
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return;
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}
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// URL to complement with "linerange" query parameter
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var targetUri = sourcelines.dataset.logurl;
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if (typeof targetUri === 'undefined') {
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return;
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}
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// Tag of children of "sourcelines" element on which to add "line
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// selection" style.
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var selectableTag = sourcelines.dataset.selectabletag;
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if (typeof selectableTag === 'undefined') {
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return;
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}
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var isHead = parseInt(sourcelines.dataset.ishead || "0");
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//* position "element" on top-right of cursor */
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function positionTopRight(element, event) {
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var x = (event.clientX + 10) + 'px',
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y = (event.clientY - 20) + 'px';
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element.style.top = y;
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element.style.left = x;
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}
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// retrieve all direct *selectable* children of class="sourcelines"
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// element
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var selectableElements = Array.prototype.filter.call(
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sourcelines.children,
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function(x) { return x.tagName === selectableTag; });
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var btnTitleStart = 'start following lines history from here';
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var btnTitleEnd = 'terminate line block selection here';
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//** return a <button> element with +/- spans */
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function createButton() {
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var btn = document.createElement('button');
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btn.title = btnTitleStart;
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btn.classList.add('btn-followlines');
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var plusSpan = document.createElement('span');
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plusSpan.classList.add('followlines-plus');
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plusSpan.textContent = '+';
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btn.appendChild(plusSpan);
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var br = document.createElement('br');
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btn.appendChild(br);
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var minusSpan = document.createElement('span');
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minusSpan.classList.add('followlines-minus');
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minusSpan.textContent = '−';
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btn.appendChild(minusSpan);
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return btn;
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}
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// extend DOM with CSS class for selection highlight and action buttons
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var followlinesButtons = [];
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for (var i = 0; i < selectableElements.length; i++) {
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selectableElements[i].classList.add('followlines-select');
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var btn = createButton();
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followlinesButtons.push(btn);
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// insert the <button> as child of `selectableElements[i]` unless the
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// latter has itself a child with a "followlines-btn-parent" class
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// (annotate view)
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var btnSupportElm = selectableElements[i];
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var childSupportElms = btnSupportElm.getElementsByClassName(
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'followlines-btn-parent');
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if ( childSupportElms.length > 0 ) {
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btnSupportElm = childSupportElms[0];
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}
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var refNode = btnSupportElm.childNodes[0]; // node to insert <button> before
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btnSupportElm.insertBefore(btn, refNode);
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}
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// ** re-initialize followlines buttons */
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function resetButtons() {
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for (var i = 0; i < followlinesButtons.length; i++) {
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var btn = followlinesButtons[i];
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btn.title = btnTitleStart;
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btn.classList.remove('btn-followlines-end');
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btn.classList.remove('btn-followlines-hidden');
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}
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}
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var lineSelectedCSSClass = 'followlines-selected';
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//** add CSS class on selectable elements in `from`-`to` line range */
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function addSelectedCSSClass(from, to) {
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for (var i = from; i <= to; i++) {
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selectableElements[i].classList.add(lineSelectedCSSClass);
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}
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}
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//** remove CSS class from previously selected lines */
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function removeSelectedCSSClass() {
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var elements = sourcelines.getElementsByClassName(
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lineSelectedCSSClass);
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while (elements.length) {
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elements[0].classList.remove(lineSelectedCSSClass);
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}
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}
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// ** return the element of type "selectableTag" parent of `element` */
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function selectableParent(element) {
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var parent = element.parentElement;
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if (parent === null) {
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return null;
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}
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if (element.tagName === selectableTag && parent.isSameNode(sourcelines)) {
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return element;
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}
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return selectableParent(parent);
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}
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// ** update buttons title and style upon first click */
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function updateButtons(selectable) {
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for (var i = 0; i < followlinesButtons.length; i++) {
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var btn = followlinesButtons[i];
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btn.title = btnTitleEnd;
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btn.classList.add('btn-followlines-end');
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}
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// on clicked button, change title to "cancel"
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var clicked = selectable.getElementsByClassName('btn-followlines')[0];
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clicked.title = 'cancel';
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clicked.classList.remove('btn-followlines-end');
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}
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//** add `listener` on "click" event for all `followlinesButtons` */
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function buttonsAddEventListener(listener) {
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for (var i = 0; i < followlinesButtons.length; i++) {
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followlinesButtons[i].addEventListener('click', listener);
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}
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}
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//** remove `listener` on "click" event for all `followlinesButtons` */
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function buttonsRemoveEventListener(listener) {
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for (var i = 0; i < followlinesButtons.length; i++) {
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followlinesButtons[i].removeEventListener('click', listener);
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}
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}
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//** event handler for "click" on the first line of a block */
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function lineSelectStart(e) {
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var startElement = selectableParent(e.target.parentElement);
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if (startElement === null) {
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// not a "selectable" element (maybe <a>): abort, keeping event
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// listener registered for other click with a "selectable" target
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return;
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}
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// update button tooltip text and CSS
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updateButtons(startElement);
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var startId = parseInt(startElement.id.slice(1));
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startElement.classList.add(lineSelectedCSSClass); // CSS
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// remove this event listener
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buttonsRemoveEventListener(lineSelectStart);
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//** event handler for "click" on the last line of the block */
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function lineSelectEnd(e) {
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var endElement = selectableParent(e.target.parentElement);
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if (endElement === null) {
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// not a <span> (maybe <a>): abort, keeping event listener
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// registered for other click with <span> target
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return;
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}
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// remove this event listener
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buttonsRemoveEventListener(lineSelectEnd);
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// reset button tooltip text
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resetButtons();
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// compute line range (startId, endId)
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var endId = parseInt(endElement.id.slice(1));
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if (endId === startId) {
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// clicked twice the same line, cancel and reset initial state
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// (CSS, event listener for selection start)
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removeSelectedCSSClass();
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buttonsAddEventListener(lineSelectStart);
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return;
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}
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var inviteElement = endElement;
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if (endId < startId) {
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var tmp = endId;
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endId = startId;
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startId = tmp;
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inviteElement = startElement;
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}
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addSelectedCSSClass(startId - 1, endId -1); // CSS
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// append the <div id="followlines"> element to last line of the
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// selection block
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var divAndButton = followlinesBox(targetUri, startId, endId, isHead);
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var div = divAndButton[0],
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button = divAndButton[1];
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inviteElement.appendChild(div);
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// set position close to cursor (top-right)
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positionTopRight(div, e);
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// hide all buttons
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for (var i = 0; i < followlinesButtons.length; i++) {
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followlinesButtons[i].classList.add('btn-followlines-hidden');
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}
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//** event handler for cancelling selection */
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function cancel() {
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// remove invite box
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div.parentNode.removeChild(div);
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// restore initial event listeners
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buttonsAddEventListener(lineSelectStart);
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buttonsRemoveEventListener(cancel);
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for (var i = 0; i < followlinesButtons.length; i++) {
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followlinesButtons[i].classList.remove('btn-followlines-hidden');
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}
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// remove styles on selected lines
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removeSelectedCSSClass();
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resetButtons();
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}
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// bind cancel event to click on <button>
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button.addEventListener('click', cancel);
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// as well as on an click on any source line
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buttonsAddEventListener(cancel);
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}
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buttonsAddEventListener(lineSelectEnd);
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}
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buttonsAddEventListener(lineSelectStart);
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//** return a <div id="followlines"> and inner cancel <button> elements */
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function followlinesBox(targetUri, fromline, toline, isHead) {
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// <div id="followlines">
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var div = document.createElement('div');
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div.id = 'followlines';
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// <div class="followlines-cancel">
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var buttonDiv = document.createElement('div');
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buttonDiv.classList.add('followlines-cancel');
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// <button>x</button>
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var button = document.createElement('button');
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button.textContent = 'x';
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buttonDiv.appendChild(button);
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div.appendChild(buttonDiv);
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// <div class="followlines-link">
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var aDiv = document.createElement('div');
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aDiv.classList.add('followlines-link');
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aDiv.textContent = 'follow history of lines ' + fromline + ':' + toline + ':';
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var linesep = document.createElement('br');
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aDiv.appendChild(linesep);
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// link to "ascending" followlines
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var aAsc = document.createElement('a');
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var url = targetUri + '?patch=&linerange=' + fromline + ':' + toline;
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aAsc.setAttribute('href', url);
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aAsc.textContent = 'older';
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aDiv.appendChild(aAsc);
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if (!isHead) {
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var sep = document.createTextNode(' / ');
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aDiv.appendChild(sep);
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// link to "descending" followlines
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var aDesc = document.createElement('a');
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aDesc.setAttribute('href', url + '&descend=');
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aDesc.textContent = 'newer';
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aDiv.appendChild(aDesc);
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}
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div.appendChild(aDiv);
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return [div, button];
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}
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}, false);
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