rendering

问题 I have seen multiple examples but none of them fit my problem. I want to use conditional rendering inside a functional component. For example, if the user is not logged in and a token is not present in the local storage, when the login form is submitted, I want to display a message that login is invalid. if (!localStorage.getItem('token')) { return <Typography>Login Invalid</Typography> console.log('Login Not possible'); } For now, I tried to make it a separate function and called it in

问题 I've got about 300+ buttons that are represented in a grid. When I try to render this, it takes a good 5 seconds to load up all buttons. Is there any alternative? Functionality that already exists such as hover over, mouse enter, left button click etc are all needed... just wondering if there is a way to speed up button rendering. Buttons are created dynamically in a grid, with an ItemsControl, that contains an ItemsPanelTemplate (that is just a grid definition of width and height), a

问题 I don't understand the concept of client-side rendering. I have always used server-side rendering with PHP/Ruby, I don't see how it is possible to have client side rendering. Who does the work? The browser? If someone could give explanations or links that explains that, I would be grateful. 回答1: Without sounding sarcastic, it is a distinction between client-side compilation/manipulation, server-side compilation/manipulation, or a combination of both. While the browser is the thing that

问题 I was amazed when I found that Mathematica gives True for the following code (on 32 bit Windows XP with Mathematica 8.0.1): Rasterize[Graphics[{RGBColor[0, 0, 0], Disk[]}]] === Rasterize[Graphics[{RGBColor[0, 0, 1/257], Disk[]}]] What is the minimal difference in RGB color values which Mathematica renders and exports as different colors? Is it machine-dependent? 回答1: I believe this behaviour is machine dependent, but I do not know how exactly it depends on the OS. On my machine, it evaluates

问题 I have a page that renders slowly. The trip across the net is quick. The initial load of the page is quick. You can actually see (if your machine is slow enough), the initial layout of the html components. Then some javascript stuff runs, making some of those components all ajaxy. Then finally the css gets applied. I can't do anything about the javascript that's slowing everything to a crawl. So I need a throbber to tell the user to hold up, the browser is working. Is there any way to trap

问题 Im creating a simple vehicle and projectile simulation game in WPF using C#. I need to have a constant frame rate (i.e. i need to know how much to move an object with a certain velocity in each frame). This way I could subscribe an event which calculates and updates positions according to the game's physics to the CompositionTarget.Rendering event. CompositionTarget.Rendering += UpdatePositions; I googled it a while, and found no answer. The fps in WPF seem to be arbitrary, and using a

问题 When I create a new project on android studio it is not giving any problem. However, looking at the activity_main.xml design it is shows me this: Rendering Problems Exception raised during rendering: action_bar. when I change sdk level 22 to 21 from the design page android studio shows nothing How can I solve this problem? This is not important problem but I wondered how can I fix this. 回答1: Yeah just had to adjust the Android level in the drop down. The design tab preview in API level 22 is

问题 I need the fastest sphere mapping algorithm. Something like Bresenham's line drawing one. Something like the implementation that I saw in Star Control 2 (rotating planets). Are there any already invented and/or implemented techniques for this? I really don't want to reinvent the bicycle. Please, help... Description of the problem. I have a place on the 2D surface where the sphere has to appear. Sphere (let it be an Earth) has to be textured with fine map and has to have an ability to scale

问题 I need the fastest sphere mapping algorithm. Something like Bresenham's line drawing one. Something like the implementation that I saw in Star Control 2 (rotating planets). Are there any already invented and/or implemented techniques for this? I really don't want to reinvent the bicycle. Please, help... Description of the problem. I have a place on the 2D surface where the sphere has to appear. Sphere (let it be an Earth) has to be textured with fine map and has to have an ability to scale

问题 I need the fastest sphere mapping algorithm. Something like Bresenham's line drawing one. Something like the implementation that I saw in Star Control 2 (rotating planets). Are there any already invented and/or implemented techniques for this? I really don't want to reinvent the bicycle. Please, help... Description of the problem. I have a place on the 2D surface where the sphere has to appear. Sphere (let it be an Earth) has to be textured with fine map and has to have an ability to scale