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// SPDX-FileCopyrightText: Artur Shaik <ashaihullin@gmail.com>
// SPDX-FileCopyrightText: Florian Bruhin (The Compiler) <mail@qutebrowser.org>
//
// SPDX-License-Identifier: GPL-3.0-or-later
/**
* Snippet to position caret at top of the page when caret mode is enabled.
* Some code was borrowed from:
*
* https://github.com/1995eaton/chromium-vim/blob/master/content_scripts/dom.js
* https://github.com/1995eaton/chromium-vim/blob/master/content_scripts/visual.js
*/
"use strict";
(function() {
// FIXME:qtwebengine integrate this with other window._qutebrowser code?
function isElementInViewport(node) { // eslint-disable-line complexity
let i;
let boundingRect = (node.getClientRects()[0] ||
node.getBoundingClientRect());
if (boundingRect.width <= 1 && boundingRect.height <= 1) {
const rects = node.getClientRects();
for (i = 0; i < rects.length; i++) {
if (rects[i].width > rects[0].height &&
rects[i].height > rects[0].height) {
boundingRect = rects[i];
}
}
}
if (boundingRect === undefined) {
return null;
}
if (boundingRect.top > innerHeight || boundingRect.left > innerWidth) {
return null;
}
if (boundingRect.width <= 1 || boundingRect.height <= 1) {
const children = node.children;
let visibleChildNode = false;
for (i = 0; i < children.length; ++i) {
boundingRect = (children[i].getClientRects()[0] ||
children[i].getBoundingClientRect());
if (boundingRect.width > 1 && boundingRect.height > 1) {
visibleChildNode = true;
break;
}
}
if (visibleChildNode === false) {
return null;
}
}
if (boundingRect.top + boundingRect.height < 10 ||
boundingRect.left + boundingRect.width < -10) {
return null;
}
const computedStyle = window.getComputedStyle(node, null);
if (computedStyle.visibility !== "visible" ||
computedStyle.display === "none" ||
node.hasAttribute("disabled") ||
parseInt(computedStyle.width, 10) === 0 ||
parseInt(computedStyle.height, 10) === 0) {
return null;
}
return boundingRect.top >= -20;
}
function positionCaret() {
const walker = document.createTreeWalker(document.body, 4, null);
let node;
const textNodes = [];
let el;
while ((node = walker.nextNode())) {
if (node.nodeType === 3 && node.data.trim() !== "") {
textNodes.push(node);
}
}
for (let i = 0; i < textNodes.length; i++) {
const element = textNodes[i].parentElement;
if (isElementInViewport(element.parentElement)) {
el = element;
break;
}
}
if (el !== undefined) {
const range = document.createRange();
range.setStart(el, 0);
range.setEnd(el, 0);
const sel = window.getSelection();
sel.removeAllRanges();
sel.addRange(range);
}
}
positionCaret();
})();
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