fixed | 易学教程

C# unsafe code fixed pointer passed as parameter

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问题 I came across the following code on msdn: unsafe static void SquarePtrParam (int* p) { *p *= *p; } unsafe static void Main() { Point pt = new Point(); pt.x = 5; pt.y = 6; // Pin pt in place: fixed (int* p = &pt.x) { SquarePtrParam (p); } // pt now unpinned. Console.WriteLine ("{0} {1}", pt.x, pt.y); } I am just wondering, we are directly accessing pointer in SquarePtrParam function, does it inherit information that array is fixed from calling method? Why don't we need to explicitly set it to

Attaining the maximum possible height for a fixed element between two other fixed elements

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问题 Alright guys here my problem, Im trying to make my <div id="content" style="margin:0 auto;"></div> take as much height as it can between my <div id="header" style="position:fixed;top:0;width:100%;height:300px;"></div> and my <div id="footer" style="position:fixed;bottom:0;width:100%;height:200px;"></div> The only css rule I have is html,body{position:fixed;height:100%;width:100%;} I tried using height:100%; on my #content but it still display as a height:auto; ...

making a div start mid page, but as user scrolls down the page, it remains at the top?

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问题 Better to give an example, to illustrate what i am describing. The div element with the list of categories starts mid page, but as the user scrolls down it remains at the top? http://www.khanacademy.org/ I know how to make a fixed element. My question is how do i make the element appear by default in the center of the page, but as the user scrolls down, the element will stay at the top. 回答1: Here's a quick jsFiddle example of what I think you're looking for. Basically you have a div that is

How to make a “Fixed” element Scrollable

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问题 I know this sounds somewhat counterintuitive, but let me explain what I am trying to do. I have a large element that serves as the background. It does not resize. It is often larger than the screen it is viewed on. Most of the content of this element (it's just an image) is near the center. Let's say that the only NECESSARY information is in the middle 800px, and the whole thing is 1600px wide. Why is it wider than necessary? Because it fades pleasingly into the rest of the background and

Bootstrap - navbar-fixed-top covers content

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问题 I have a question about navbar-fixed-top. Well, I have a simple problem with it. My fixed navbar covers content, for example in "About us" page, it covers row with "About us" title. I have no idea how can I fix it, because when I resize website (mobile devices size) the header is visible. Of course I have this kind of problem with headers in other pages (Full Width and 404). Also, in Index page, it covers some of carousel slider. Information: website: http://testerix.site90.com/index.html

Footer hides floating nav - Any way to slide floating nav up once it reaches the footer?

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问题 I'm trying to add a floating navigation to the side bar. I have jquery floating the nav to the top after you begin scrolling. It works fine at the top, but once you reach the bottom the footer hides the navigation. The navigation needs to scroll up once it reaches a certain point. Any solutions? <script type="text/javascript"> $(document).ready(function () { var top = $('#floatingNav').offset().top - parseFloat($('#floatingNav').css('marginTop').replace(/auto/, 0)); $(window).scroll(function

CSS的宽高百分比和盒子定位

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CSS宽高比为百分比时元素宽高以百分比设置时的大小相对谁来确定《–（点击跳转）转自 http : / / www . divcss5 . com / rumen / r403 . shtml 绝对定位与相对定位 CSS position绝对定位absolute relative 《–（点击跳转） absolute与fixed fixed:固定定位 absolute:绝对定位区别很简单： 1、没有滚动条的情况下没有差异 2、在有滚动条的情况下，fixed定位不会随滚动条移动而移动，而absolute则会随滚动条移动常用场合： 1.fixed常用于网站边缘的公司联系方式和快速回到顶部 2.absolute常用于页面 absolute 比如咱们在刷QQ空间的时候，每个好友的说说就是absolute的。你往下滑过了他的动态，你想看到就得往上滑回去。 fixed fixed的呢，就比如（这里是手机QQ举例啊）默认是右下角的一个小聊天泡窗口就是那个你点开它会显示你的消息，会随着你的屏幕滑动始终保持在屏幕的右下角。尽管你已经刷过了好几条说说了。来源： CSDN 作者：小莫神和他的的链接： https://blog.csdn.net/qq_40710190/article/details/103760533

How can I make a fix positioned menu bar?

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问题 I would like to style my menu bar Like THIS. It's fixed to the top of the site when you scroll down and it isn't fixed where it is when the page is loaded. How can it be done with CSS? 回答1: What you're after is a 'sticky navbar/menu'. The simplest way would be to add the below CSS to your menu/navbar position:fixed; top:0px; That said, for an effect closer to the one you've posted, you'll probably want to look at using some jQuery, e.g.: $(window).bind('scroll', function() { if ($(window)

How can I make a fix positioned menu bar?

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JQuery Position:Fixed 'NAVBAR' by scrolling the page

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问题 Basically I want my NAVBAR to stay at the top of the window position:fixed as soon as the #CONTENT DIV under the NAV get to the top of the window. The HTML is <header> Which is full screen size: 100% x 100% </header> <nav> </nav> <div id="content"> <section> </section> <footer> </footer> </div> Here you can find the DEMO http://jsfiddle.net/dcdeiv/aG6DK/2/ Everything works fine, except the jQuery code. I tried to create a variable from the return of the height value of the #contentDiv while