alignment | 易学教程

White-space: nowrap vs white-space: normal why is the effect on floating elements so big?

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问题 Definition from w3c : normal Sequences of whitespace will collapse into a single whitespace. Text will wrap when necessary. This is default Play it » nowrap Sequences of whitespace will collapse into a single whitespace. Text will never wrap to the next line. The text continues on the same line until a tag is encountered. So why does it make so much difference in the looks of floated elements? e.g. compare this: JsBin with white-space normal showing a nicely aligned layout <table> <thead> <tr

unaligned memory accesses

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问题 I'm working on an embedded device that does not support unaligned memory accesses. For a video decoder I have to process pixels (one byte per pixel) in 8x8 pixel blocks. The device has some SIMD processing capabilities that allow me to work on 4 bytes in parallel. The problem is, that the 8x8 pixel blocks aren't guaranteed to start on an aligned address and the functions need to read/write up to three of these 8x8 blocks. How would you approach this if you want very good performance? After a

unaligned memory accesses

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Centering a variable width grid while aligning its elements to the left

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问题 Consider the following <div class="container"> <div class="grid"> <div class="unit"></div> <div class="unit"></div> <div class="unit"></div> <div class="unit"></div> <div class="unit"></div> <div class="unit"></div> .... </div> </div> Using images, basically what I have is something like this As you can see the green blocks and the container are aligned to the left What I want to acheive is something like this. The .unit elements have constant width The .grid element should expand with width

Aligning TextViews in a TableRow

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问题 I am trying to align 3 text views in a tablerow like this: |------------------------------------------------| | {TextView1} {TextView2} {TextView3} | |------------------------------------------------| // TextView 1, 2 Left aligned // TextView 3 Right aligned Also, the table row should fill the table width. With the code below I can only achieve this: |------------------------------------------------| | {TextView1} {TextView2} {TextView3} | |------------------------------------------------| I

Make the background-color of a <div> fill the enclosing <td>

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问题 I have an HTML table whose cells contain div s with display:inline-block , containing text of varying sizes. I need the text to align on the baseline, and I need the background colors of the div s to fill the height of the cells. For the largest font, the background color does fill the cell, but it doesn't for the smaller fonts: Is this possible? Obvious solutions like div { height:100% } seem to be scuppered by the varying font sizes. Here's the code so far: <!DOCTYPE html> <html lang="en">

Alignment of data members and member functions for performance

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问题 Is it true aligning data members of a struct/class no longer yields the benefits it used to, especially on nehalem because of hardware improvements? If so, is it still the case that alignment will always make better performance, just very small noticeable improvements compared with on past CPUs? Does alignment of member variables extend to member functions? I believe I once read (it could be on the wikibooks "C++ performance") that there are rules for "packing" member functions into various

Generically overloading operator new while considering alignment requirements

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问题 Situation I am writing a memory manager for dynamic memory (de)allocations. For a class A to use it when operator new (or delete ) is called, it is sufficient for class A to inherit from a class CustomAllocate , which itself overloads new and delete in a way that uses the memory manager. Problem However, apparently I completely missed out on alignment requirements. Unfortunately, CustomAllocate::new has no information about how a class A inheriting from it should be aligned as the only

Set Vertical Alignment of QFormLayout QLabel

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问题 I'm using PySide/PyQt, but this is a general Qt question. Is there a way to set up a QFormLayout so that labels are centered vertically without having to explicitly create the QLabel's and set their vertical size policy to expanding first? When the widget in column 2 is taller than my label, I want my label to be centered vertically with the widget, rather than aligned with it's top... Here's an example script that demonstrates the problem. I've colored the labels red to better demonstrate

C++ parent class alignment

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问题 Is it possible to specify alignment of parent class? for example something like (which does not compiled): template<size_t n> class Vector : public boost::array<double,n> __attribute__ ((aligned(16))) { thanks well, from comments I gather this is no good way to go. I think I will just stick to composition/alignment of private array 回答1: We don't need to request alignment on the derived class neither we can. The reason why we don't need is that it is enough to request alignment for the derived