overflow | 易学教程

什么是BFC

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写CSS样式时，对一个元素设置css,我们首先要知道这个元素是块级元素还是行内元素，而BFC就是用来格式化块级盒子的。 BFC定义：块级格式化上下文，它是指一个独立的块级渲染区域，只有Block-level Box参与，该区域拥有一套渲染规则来约束块级盒子的布局，且与区域外部无关。满足下列CSS声明之一的元素便会生成BFC： 1.根元素或其它包含它的元素 2.float的值不为none； 3.overflow的值不为visible； 4.position的值不为static； 5.display的值为inline-block、table-cell、table-caption； 6.flex boxes (元素的display: flex或inline-flex) BFC的布局规则是什么样的呢？ 1、内部的元素会在垂直方向一个接一个地排列，可以理解为是BFC中的一个常规流 2、元素垂直方向的距离由margin决定，即属于同一个BFC的两个相邻盒子的margin可能会发生重叠 3、每个元素的左外边距与包含块的左边界相接触(从左往右，否则相反)，即使存在浮动也是如此，这说明BFC中的子元素不会超出它的包含块 4、BFC的区域不会与float元素区域重叠 5、计算BFC的高度时，浮动子元素也参与计算 6、BFC就是页面上的一个隔离的独立容器，容器里面的子元素不会影响到外面的元素

Silverlight: Canvas overflows

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问题 I have created a Canvas, and within it I placed a StackPanel. The StackPanel is horizontal, and it accepts a list of thumbnailed images. The Canvas has a fixed size. When I put more thumbnails than the Canvas width can hold, the StackPanel is supposed to overflow from the Canvas, so I can move it to center the current thumbnail. Everything works correctly, only, the StackPanel's overflow is visible! Is there a way to hide it? Or is the entire approach wrong? Here is a screenshot. The canvas

Are C++ strings and streams buffer overflow safe?

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问题 If I use std::cin, std::cout and std::string, is there any possibility that someone will exploit the buffer overflow? I ask this because I still see a lot of people that still use null-terminated strings instead of standard containers in C++. 回答1: It depends. Of course, when you use C-style code/API's, there is no difference . But using STL or C++ idioms doesn't guarantee that you're safe. C++ gives you the choice, always. Contrast these two near-identical twins: int n; std::cin >> n; std:

List items run outside of list and div area

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问题 I'm having an issue with a menu un-ordered list. Whereby the list items are over running the <ul> and <div> boundaries and only starting the next line once it has reach the edge of the screen. Heres the website: http://finalonline.co.uk/mypics/gallery/categories/ 回答1: You can use float: left; on the li s instead of display: inline; . Just remember to also use overflow: hidden; on the parent element (the ul ). Another option would be to use: display: inline-block , but I'm not 100% sure about

Efficient Matlab implementation of Multinomial Coefficient

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问题 I want to calculate the multinomial coefficient: where it is satisifed n=n0+n1+n2 The Matlab implementation of this operator can be easily done in the function: function N = nchooseks(k1,k2,k3) N = factorial(k1+k2+k3)/(factorial(k1)*factorial(k2)*factorial(k3)); end However, when the index is larger than 170, the factorial would be infinite which would generate NaN in some cases, e.g. 180!/(175! 3! 2!) -> Inf/Inf-> NaN . In other posts, they have solved this overflow issue for C and Python.

Integer Overflow - Converting C# to VB.Net code

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问题 Got a problem with a code conversion from C# to VB.Net. var x = 5783615; var y = 56811584; var t = x * y; x, y and t are integers. In c# 't' will be -1553649728. In VB.Net, I will get an integer overflow exception. Any idea how to fix it? 回答1: C#, by default, doesn't check for overflows, but VB does (by default). You can setup your VB Project to not check for integer overflows in the Advanced Compile Options in the Compile tab. This will cause that specific project to stop raising

Detecting horizontal div overflow with JavaScript?

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问题 I have a DIV that has plenty of child DIVs inside of it. What I want is similar to Firefox's tabs, when you have too many tabs open or the main DIV width is too small, the interface will detect overflow and show a button on the right side to list all hidden tabs. The problem is that I have no idea where to even start looking for help. 回答1: Is you main DIV set to overflow:hidden ? If so, you can test its need to overflow by incrementing the scrollLeft property and then querying it to see if it

了解CSS浮动以及清理浮动（Float）

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CSS浮动浮动的框可以向左或向右移动，直到它的外边缘碰到包含框或另一个浮动框的边框为止。由于浮动框不在文档的普通流中，相当于不占用空间，所以文档的普通流中的块框表现得就像浮动框不存在一样。 CSS 浮动属性 css中，我们使用float来实现浮动，使用方法如下： img{ float:right; } float属性值有以下几种： left：元素向左浮动 right：元素向右浮动 none：默认值。元素不浮动，并会显示在其文本出现的位置 inherit：从父元素继承float属性浏览器支持所有的主浏览器都支持float，但是IE均不支持"inherit" CSS浮动情形下面介绍浮动的使用情形及问题：如下图所示，当把框1向右浮动时，它脱离文档流向右移动，直到它的右边框碰到包含框浮动意味着脱离文档流，可能会引发一系列的问题，比如，将上图的框1移向左边，那么框1在文档中相当于没有，框2，框3上移，表现出来就是框2消失不见如果想要解决这个问题的话，可以三个框同时左移，就不会有覆盖的情况，那么框 1 向左浮动直到碰到包含框，另外两个框向左浮动直到碰到前一个浮动框。同时移动也带来一些问题，如果包含框太窄，没办法容纳三个框，这个时候该怎么办? 这个时候浮动块就会进行调节，如下图所示，第三个框会自动向下浮动，直到有足够的空间，如果浮动过程中发现有浮动框高度不一致，则会被卡住

The Impossible Layout?

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问题 I'm beginning to think this is impossible, but thought I'd ask you guys. Basically it's a 2 column layout, but the "business" wants the following: -Always take up the entire browser window -Accommodate resizing of browser window -Left column will be fixed width, but that width should be flexible from page-to-page. -Left column has a region at the top with fixed height. -Left column has a bottom region. It should take up the remaining vertical space of browser window. If content is very large,

Make element width stretch to fit its children when element's parent has overflow: auto;

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问题 In this simplified example, I have a bookcase with books sitting on bookshelves. The bookcase is the outermost element with a defined width. The books on a bookshelf are supposed to appear left to right without wrapping. The bookshelf is supposed to stretch its width to show all the books on its shelf. All bookshelves need to be the same width, the width of the widest bookshelf. My HTML: <div class="bookcase"> <div class="bookshelf"> <div class="book"> <div class="book"> <div class="book"> <