mirror of
https://github.com/matrix-construct/construct
synced 2024-11-27 09:12:36 +01:00
107 lines
2.5 KiB
JavaScript
107 lines
2.5 KiB
JavaScript
/*
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// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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*/
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'use strict';
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/**************************************
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* Scrolling & Viewport utils
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*
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*/
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mc.scroll = {};
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mc.scroll.at = function(e)
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{
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return $(e).prop("scrollTop");
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};
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mc.scroll.at.top = function(e)
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{
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return mc.scroll.at(e) == 0;
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};
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mc.scroll.at.bottom = function(e)
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{
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let st = $(e).prop("scrollTop");
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let sh = $(e).prop("scrollHeight");
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let ch = $(e).prop("clientHeight");
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return sh - ch <= st + 1;
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};
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mc.scroll.to = function(e, pos, speed = "slow")
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{
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return $(e).animate({ scrollTop: pos }, speed);
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};
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mc.scroll.to.top = function(e, speed = "slow")
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{
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return mc.scroll.to(e, 0, speed);
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};
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mc.scroll.to.bottom = function(e, speed = "slow")
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{
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return mc.scroll.to(e, $(e).prop("scrollHeight"), speed);
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};
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/**
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* top: the percentage of area invisible above the viewport.
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* view: the percentage of the area in the viewport.
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* bottom: the percentage of the area invisible below the viewport.
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*/
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mc.scroll.pct = function(e)
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{
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let st = $(e).prop("scrollTop");
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let sh = $(e).prop("scrollHeight");
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let ch = $(e).prop("clientHeight");
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return {
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top: st / sh,
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view: ch / sh,
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bottom: (sh - (st + ch)) / sh,
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}
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};
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/**
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* Given a DOM element, this function tests if the user can see the element,
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* (and for now it returns true only if the *whole* element is in the viewport).
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* Originally intended to figure out which events in the Matrix room timeline have
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* fallen into the scrollback and can be removed.
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*/
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function isElementInViewport(e)
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{
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if(typeof jQuery === "function" && e instanceof jQuery)
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e = e[0];
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let rect = e.getBoundingClientRect();
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return (
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rect.top >= 0 &&
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rect.left >= 0 &&
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rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
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rect.right <= (window.innerWidth || document.documentElement.clientWidth)
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);
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}
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mc.get_rect = function(e)
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{
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if(typeof jQuery === "function" && e instanceof jQuery)
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e = e[0];
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if(e === undefined)
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return undefined;
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let rect = e.getBoundingClientRect();
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return {
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top: rect.top,
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right: rect.right,
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bottom: rect.bottom,
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left: rect.left,
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};
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};
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