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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I am trying to insert to my database's one table but this process takes some minutes. I would like to have a indeterminate progress bar while my application is trying to insert. In order to have progress bar, I want to use JavaFX but I don't know how to implement it that it just has be shown until the end of inserting in to the database process. 回答1: JavaFX Tasks are probably the way to go. They provide a way to execute long-running tasks in the background without freezing the user interface. Here's an example of something you

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I would like to draw a 3D histogram (with gnuplot or octave) in order to represent my data. lets say that I have a data file in the following form: 2 3 4 8 4 10 5 6 7 I'd like to draw nine colored bars (the size of the matrix), in the set [1,3]x[1,3], such that the bar's color is proportional to the bar's height. How can I do this? 回答1: Below is a function I implemented that acts as a bar3 replacement (partially). In my version, the bars are rendered by creating a patch graphics object : we build a matrix of vertex coordinates and a list of

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: In my app, I have a page view controller that allows the user to swipe between different "sections" of the app, and at the top in the nav bar I change the title text to the new section the user has swiped to via pageViewController:didFinishAnimating:previousViewControllers:transitionCompleted: . It is currently instantly changing the title text when the animation has completed. I would like to improve this with some animation, a subtle fading in and out effect. I first tried to implement [UIView animationWithDuration:...] to animate changing

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Why does SQL require that I specify on which attributes to group? Why can't it just use all non-aggregates? If an attribute is not aggregated and is not in the GROUP BY clause then nondeterministic choice would be the only option assuming tuples are unordered (mysql kind of does this) and that is a huge gotcha. As far as I know, Postgresql requires that all attributes not appearing in the GROUP BY must be aggregated, which reinforces that it is superfluous. Am I missing something or is this a language design flaw that promotes loose

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to make a bar graph where the largest bar would be nearest to the y axis and the shortest bar would be furthest. So this is kind of like the Table I have Name Position 1 James Goalkeeper 2 Frank Goalkeeper 3 Jean Defense 4 Steve Defense 5 John Defense 6 Tim Striker So I am trying to build a bar graph that would show the number of players according to position p but the graph shows the goalkeeper bar first then the defense, and finally the striker one. I would want the graph to be ordered so that the defense bar is closest to the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I use: Celery Django-Celery RabbitMQ I can see all my tasks in the Django admin page, but at the moment it has just a few states, like: RECEIVED RETRY REVOKED SUCCESS STARTED FAILURE PENDING It's not enough information for me. Is it possible to add more details about a running process to the admin page? Like progress bar or finished jobs counter etc. I know how to use the Celery logging function, but a GUI is better in my case for some reasons. So, is it possible to send some tracing information to the Django-Celery admin page? 回答1: I am

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I want to create an android application which has 3 sliding tab panel and each of them will 5 button (save,new,delete,exit..). What I want is exactly as follow: I created sliding tab panel.And for 5 button, I added split action bar.But It works as normal split action bar.My AndroidManifest.xml is: Where is my wrong? 回答1: To implement splitActionBar : Just add android:uiOptions="splitActionBarWhenNarrow" to your activity tag in the AndroidManifest.xml like this... ` ` You can read more here and here NOTE: It is available ONLY for handset

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a web page that has several files available for download. These files vary in size from 1MB to 40MB. To help the user see that something is actually happening during the file download process, I would like to include a progress bar that gives a visual indication of the download progress. Would the jQuery UI Progress Bar work for this kind of task? If so, are there some examples of such coding that I could follow? (Yes, I have reviewed the jQuery UI site on this). Thanks. 回答1: In short, no, you can't do this. The page listing these

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: $ php --version PHP 5.5.4 (cli) (built: Sep 19 2013 17:10:06) Copyright (c) 1997-2013 The PHP Group Zend Engine v2.5.0, Copyright (c) 1998-2013 Zend Technologies The following code (similar to example at https://bugs.php.net/bug.php?id=49543 ): class Foo { public function bar() { return function() use ($this) { echo "in closure\n"; }; } } fails with: PHP Fatal error: Cannot use $this as lexical variable Yet according to the PHP docs and a comment on that bug report from Rasmus Lerdorf, using $this in anonymous functions was added as of PHP 5

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I want to set the colour of the status bar (The small strip on top where the clock and battery is displayed) to black background with white text. How can I do this ? My approach so far : I added the following in the info.plist View controller-based status bar appearance --> NO and in the viewController - (UIStatusBarStyle)preferredStatusBarStyle { return UIStatusBarStyleDefault; } However, the style does not change. How can I make the status bar black? 回答1: For Xcode 8 / iOS 10 / Swift 3: Change the status bar background color temporarily on