mirror of
https://github.com/matrix-construct/construct
synced 2024-12-30 17:34:04 +01:00
107 lines
2.5 KiB
JavaScript
107 lines
2.5 KiB
JavaScript
/*
|
|
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
/**************************************
|
|
* Scrolling & Viewport utils
|
|
*
|
|
*/
|
|
|
|
mc.scroll = {};
|
|
|
|
mc.scroll.at = function(e)
|
|
{
|
|
return $(e).prop("scrollTop");
|
|
};
|
|
|
|
mc.scroll.at.top = function(e)
|
|
{
|
|
return mc.scroll.at(e) == 0;
|
|
};
|
|
|
|
mc.scroll.at.bottom = function(e)
|
|
{
|
|
let st = $(e).prop("scrollTop");
|
|
let sh = $(e).prop("scrollHeight");
|
|
let ch = $(e).prop("clientHeight");
|
|
return sh - ch <= st + 1;
|
|
};
|
|
|
|
mc.scroll.to = function(e, pos, speed = "slow")
|
|
{
|
|
return $(e).animate({ scrollTop: pos }, speed);
|
|
};
|
|
|
|
mc.scroll.to.top = function(e, speed = "slow")
|
|
{
|
|
return mc.scroll.to(e, 0, speed);
|
|
};
|
|
|
|
mc.scroll.to.bottom = function(e, speed = "slow")
|
|
{
|
|
return mc.scroll.to(e, $(e).prop("scrollHeight"), speed);
|
|
};
|
|
|
|
/**
|
|
* top: the percentage of area invisible above the viewport.
|
|
* view: the percentage of the area in the viewport.
|
|
* bottom: the percentage of the area invisible below the viewport.
|
|
*/
|
|
mc.scroll.pct = function(e)
|
|
{
|
|
let st = $(e).prop("scrollTop");
|
|
let sh = $(e).prop("scrollHeight");
|
|
let ch = $(e).prop("clientHeight");
|
|
return {
|
|
top: st / sh,
|
|
view: ch / sh,
|
|
bottom: (sh - (st + ch)) / sh,
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Given a DOM element, this function tests if the user can see the element,
|
|
* (and for now it returns true only if the *whole* element is in the viewport).
|
|
* Originally intended to figure out which events in the Matrix room timeline have
|
|
* fallen into the scrollback and can be removed.
|
|
*/
|
|
function isElementInViewport(e)
|
|
{
|
|
if(typeof jQuery === "function" && e instanceof jQuery)
|
|
e = e[0];
|
|
|
|
let rect = e.getBoundingClientRect();
|
|
return (
|
|
rect.top >= 0 &&
|
|
rect.left >= 0 &&
|
|
rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
|
|
rect.right <= (window.innerWidth || document.documentElement.clientWidth)
|
|
);
|
|
}
|
|
|
|
mc.get_rect = function(e)
|
|
{
|
|
if(typeof jQuery === "function" && e instanceof jQuery)
|
|
e = e[0];
|
|
|
|
if(e === undefined)
|
|
return undefined;
|
|
|
|
let rect = e.getBoundingClientRect();
|
|
return {
|
|
top: rect.top,
|
|
right: rect.right,
|
|
bottom: rect.bottom,
|
|
left: rect.left,
|
|
};
|
|
};
|