mirror of https://github.com/friendica/friendica
116 lines
3.1 KiB
JavaScript
116 lines
3.1 KiB
JavaScript
'use strict';
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var _ = require('../../lib/helper');
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var instances = require('../instances');
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var updateGeometry = require('../update-geometry');
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var updateScroll = require('../update-scroll');
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function bindSelectionHandler(element, i) {
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function getRangeNode() {
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var selection = window.getSelection ? window.getSelection() :
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document.getSelection ? document.getSelection() : '';
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if (selection.toString().length === 0) {
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return null;
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} else {
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return selection.getRangeAt(0).commonAncestorContainer;
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}
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}
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var scrollingLoop = null;
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var scrollDiff = {top: 0, left: 0};
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function startScrolling() {
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if (!scrollingLoop) {
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scrollingLoop = setInterval(function () {
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if (!instances.get(element)) {
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clearInterval(scrollingLoop);
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return;
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}
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updateScroll(element, 'top', element.scrollTop + scrollDiff.top);
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updateScroll(element, 'left', element.scrollLeft + scrollDiff.left);
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updateGeometry(element);
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}, 50); // every .1 sec
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}
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}
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function stopScrolling() {
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if (scrollingLoop) {
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clearInterval(scrollingLoop);
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scrollingLoop = null;
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}
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_.stopScrolling(element);
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}
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var isSelected = false;
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i.event.bind(i.ownerDocument, 'selectionchange', function () {
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if (element.contains(getRangeNode())) {
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isSelected = true;
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} else {
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isSelected = false;
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stopScrolling();
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}
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});
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i.event.bind(window, 'mouseup', function () {
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if (isSelected) {
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isSelected = false;
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stopScrolling();
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}
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});
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i.event.bind(window, 'keyup', function () {
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if (isSelected) {
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isSelected = false;
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stopScrolling();
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}
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});
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i.event.bind(window, 'mousemove', function (e) {
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if (isSelected) {
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var mousePosition = {x: e.pageX, y: e.pageY};
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var containerGeometry = {
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left: element.offsetLeft,
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right: element.offsetLeft + element.offsetWidth,
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top: element.offsetTop,
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bottom: element.offsetTop + element.offsetHeight
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};
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if (mousePosition.x < containerGeometry.left + 3) {
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scrollDiff.left = -5;
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_.startScrolling(element, 'x');
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} else if (mousePosition.x > containerGeometry.right - 3) {
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scrollDiff.left = 5;
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_.startScrolling(element, 'x');
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} else {
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scrollDiff.left = 0;
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}
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if (mousePosition.y < containerGeometry.top + 3) {
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if (containerGeometry.top + 3 - mousePosition.y < 5) {
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scrollDiff.top = -5;
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} else {
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scrollDiff.top = -20;
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}
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_.startScrolling(element, 'y');
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} else if (mousePosition.y > containerGeometry.bottom - 3) {
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if (mousePosition.y - containerGeometry.bottom + 3 < 5) {
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scrollDiff.top = 5;
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} else {
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scrollDiff.top = 20;
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}
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_.startScrolling(element, 'y');
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} else {
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scrollDiff.top = 0;
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}
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if (scrollDiff.top === 0 && scrollDiff.left === 0) {
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stopScrolling();
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} else {
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startScrolling();
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}
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}
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});
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}
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module.exports = function (element) {
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var i = instances.get(element);
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bindSelectionHandler(element, i);
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};
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