block

问题 I use Qt4 QPushButton with QMenu in it (set by setMenu() ). I need to show this menu when some unrelated event occurs. Method QPushButton::showMenu() does this, but it blocks until user closes the menu. QMenu::show() also does this, but it shows the menu in the top left corner of the screen. How can I programmatically make the menu show up properly positioned, and without blocking? 回答1: QMenu is QWidget . So you can call move() before show() . 回答2: You can use void QMenu::popup ( const QPoint

问题 I recently asked how to test in RSpec if a block was called and the answers to that question seem to work in a simple case. The problem is when the initialization with the block is more complex. Then it is done in before and reused by a number of different tests in the context, among them the one testing if the block was evaluated. See the example: context "the node definition using block of code" do before do @n=node do # this block should be called end # some more complex setup concerning

问题 I've got a long list of comments in a separate document that refer the named subsystem blocks within a Simulink model. I'm going to process the document with a script that will generate a browser-viewable page, with each block name clickable - such that when you click on the block name, Matlab will launch using a CLI command, and display the model which the comment refers to. The document generation and shell function call is all working, but I can't find a command that will centre on a

问题 I have 1 parent table-cell .t and 2 child blocks .ch1 and .ch2 : HTML: <div class="t"> <div class="ch1">1</div> <div class="ch2">2</div> </div> CSS: .t { display: table-cell; background-color:green; height:200px; width:200px; } .ch1 { background-color:blue; display: block; } .ch2 { background-color:red; display: block; } Is it possible to push .ch2 to bottom, but left .ch1 on top (if use vertical-align: bottom; of .t it will push both blocks to bottom) JSFiddle: https://jsfiddle.net/hvz4cn69/

问题 I have a login system that I am trying to make as secure as possible. After ten failed attempts, I would like to block the IP address. How can I open a file in PHP and add a line to my .htaccess file to block the IP Address? Here is my .htaccess file: # Turn on RewriteEngine RewriteEngine on # Block IP addresses with too many failed attempts RewriteCond %{REMOTE_ADDR} ^217.172.179.*$ [OR] RewriteCond %{REMOTE_ADDR} ^217.172.180.*$ RewriteCond %{REQUEST_URI} !/error/blocked.php$ [NC]

问题 I would like to know if anyone can point me in the right direction regarding what frameworks/methods to use when replacing a block of pixels in an image with another block of pixels. For example lets say I have a simple image colored fully red and I consider my pixel block size as 5x5 pixels. Now every 3 blocks I want to replace the 3rd block with a blue colored block (5x5 pixels) so that it would result in a red image with blue blocks appearing every 3 red blocks. I've found information

问题 Is it possible to block a user on Facebook using the open graph API? I am NOT looking to block a user from an App, but would like to allow users to block a facebook friend if they wish in my app. This would be the same as visiting Facebook.com and blocking a user which hides them from all of your feeds etc. So far I have done a lot of digging and cannot find an answer. Still pouring over API but figured I would see if anyone has nay experience. Thanks! 回答1: No, it is not possible to modify a

问题 I'm trying to block out some files with a php script, however, i want my javascript ajax calls to allow the scripts, i don't know if this is even possible but.. What i do now is, $filename = array('index.php'); $basename = basename($_SERVER['REQUEST_URI']); if(!in_array($basename, $filename)) { die('...'); } This will block all files and not index.php, but what if i have an login.php that makes my ajax calls possible? 回答1: When you send a JavaScript AJAX call it adds X-Requested-With :

问题 I have a method where I take in a model and result_size . The first thing i try to do in this method is: array = model.logs.find_in_batches(:batch_size => result_size) But this doesn't work; instead it returns "No Block Given (Yield)". I guess I'm just unfamiliar with blocks and yields. If anyone could help me understand/fix this problem I would greatly appreciate it! Thanks in advance! 回答1: find_in_batches expects you to pass the values into a block, as so: model.logs.find_in_batches(:batch

问题 I've recently been trying to understand the importance of blocks in programming (Objective-C in particular). They're obviously used quite a lot in iOS/Cocoa APIs, so I'm trying to understand them. Mostly, I still don't understand why you would use a block versus just creating a separate helper function. For example, if I create a block that implements some sorting function, wouldn't it be easier to create that function as a method of a helper class so all objects in the code could use it more