111 lines
3.6 KiB
JavaScript
111 lines
3.6 KiB
JavaScript
/**
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* Copyright 2015 Artur Shaik <ashaihullin@gmail.com>
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* Copyright 2015 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
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*
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* This file is part of qutebrowser.
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*
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* qutebrowser is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* qutebrowser is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with qutebrowser. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* eslint-disable max-len */
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/**
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* Snippet to position caret at top of the page when caret mode is enabled.
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* Some code was borrowed from:
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*
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* https://github.com/1995eaton/chromium-vim/blob/master/content_scripts/dom.js
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* https://github.com/1995eaton/chromium-vim/blob/master/content_scripts/visual.js
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*/
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/* eslint-enable max-len */
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"use strict";
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function isElementInViewport(node) {
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var i;
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var boundingRect = (node.getClientRects()[0] ||
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node.getBoundingClientRect());
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if (boundingRect.width <= 1 && boundingRect.height <= 1) {
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var rects = node.getClientRects();
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for (i = 0; i < rects.length; i++) {
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if (rects[i].width > rects[0].height &&
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rects[i].height > rects[0].height) {
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boundingRect = rects[i];
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}
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}
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}
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if (boundingRect === undefined) {
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return null;
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}
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if (boundingRect.top > innerHeight || boundingRect.left > innerWidth) {
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return null;
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}
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if (boundingRect.width <= 1 || boundingRect.height <= 1) {
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var children = node.children;
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var visibleChildNode = false;
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var l = children.length;
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for (i = 0; i < l; ++i) {
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boundingRect = (children[i].getClientRects()[0] ||
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children[i].getBoundingClientRect());
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if (boundingRect.width > 1 && boundingRect.height > 1) {
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visibleChildNode = true;
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break;
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}
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}
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if (visibleChildNode === false) {
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return null;
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}
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}
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if (boundingRect.top + boundingRect.height < 10 ||
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boundingRect.left + boundingRect.width < -10) {
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return null;
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}
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var computedStyle = window.getComputedStyle(node, null);
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if (computedStyle.visibility !== 'visible' ||
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computedStyle.display === 'none' ||
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node.hasAttribute('disabled') ||
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parseInt(computedStyle.width, 10) === 0 ||
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parseInt(computedStyle.height, 10) === 0) {
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return null;
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}
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return boundingRect.top >= -20;
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}
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(function() {
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var walker = document.createTreeWalker(document.body, 4, null);
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var node;
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var textNodes = [];
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var el;
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while ((node = walker.nextNode())) {
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if (node.nodeType === 3 && node.data.trim() !== '') {
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textNodes.push(node);
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}
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}
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for (var i = 0; i < textNodes.length; i++) {
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var element = textNodes[i].parentElement;
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if (isElementInViewport(element.parentElement)) {
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el = element;
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break;
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}
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}
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if (el !== undefined) {
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var range = document.createRange();
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range.setStart(el, 0);
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range.setEnd(el, 0);
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var sel = window.getSelection();
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sel.removeAllRanges();
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sel.addRange(range);
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}
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})();
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