selector | 易学教程

Use Jsoup to select an HTML element with no class

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Consider an html document like this one <div> <p>...</p> <p>...</p> ... <p class="random_class_name">...</p> ... </div> How could we select all of the p elements, but excluding the p element with random_class_name class? Elements ps = body.select("p:not(.random_class_name)"); You can use the pseudo selector :not If the class name is not known, you still can use a similar expression: Elements ps = body.select("p:not([class])"); In the second example I use the attribute selector [] , in the first the normal syntax for classes. See the Jsoup docu about css selectors Document doc = Jsoup.parse

How to detect switch between macOS default & dark mode using Swift 3

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I want to change my status bar app icon when the user switches from default to dark mode and vice versa (using Swift 3). Here’s what i have so far: func applicationDidFinishLaunching(_ aNotification: Notification) { DistributedNotificationCenter.default().addObserver(self, selector: #selector(darkModeChanged(sender:)), name: "AppleInterfaceThemeChangedNotification", object: nil) } ... func darkModeChanged(sender: NSNotification) { print("mode changed") } Unfortunately, it’s not working. What am I doing wrong? I'm using this Swift 3 syntax successfully: DistributedNotificationCenter.default

How to change text color on press of a particular textview in a linearlayout

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I have a Linear layout with 3 text views. I want to change the text view's font color when any of the text view is selected. I would like to retain the new color until another text view is selected. Basically this linear layout should mimic check box's selection behavior. I would like to use the selector to change the color of the text view's font color. I used the below selector on text view's textColor and this only changes the font color as long as the text view is pressed android:textColor="@drawable/selector_header_text" xml <?xml version="1.0" encoding="utf-8"?> <selector xmlns:android=

Highlight selected item on a gridview

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问题 I am trying to highlight a selected item on a gridview (dinamically populated with an adapter), but it is not working. I did research and i even tried to copy exactly the selector of other people and even the way that they put it on the gridview but i am not being able to put it working. It just doesn't do anything. The background of each item is white (like i wanted), but when i press it (it it is on top of a textview or a imageview (part of the gridview item) it doesn't do anything. If i

Java NIO windows implementation

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问题 While working on a project using the the NIO.2 AIO features I looked in the "old" NIO selector implementation and saw that on windows the default select-function is used which does not scale at all on windows due to a bad internal implementation. Everybody knows that on windows IOCP is the only real solution. Of course the callback-on-completion model does not fit into the NIO selector model but does this effectively mean that using NIO on windows is basically not a good idea ? For instance:

selector as parameter in IOS

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I want to raise a different method for each created button. I try to call "FirstImage" method in viewDidLoad but it doesn't work. I have a problem with the selector in ViewDidLoad. Didn't recognise "FirstImage" which is a void method without parameter. ViewController.m - (void)createFirstButton:(NSString *)myName: (SEL *)myAction{ UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [btn addTarget:self action:@selector(myAction) forControlEvents:UIControlEventTouchUpInside]; [btn setTitle:myName forState:UIControlStateNormal]; btn.frame = CGRectMake(20, 916, 120, 68); [self.view

Perform Selector With Object in swift 3

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I am trying to perform selector with object in swift 3.0 I have a selector which have one parameter func imageSelected(aImage : UIImage) and I am calling it like viewC.perform(Selector.init("imageSelected:"), with: image, afterDelay: 0.1) But the app crashes with error that the selector is not defined. Here's something I always do when I encounter selectors in swift: Ignore the parameters, just use the name. You used this: imageSelected: What is that : doing there? Delete it! Just use the name of the method! Also, there is this great #selector syntactic sugar, please use that: viewC.perform(

android中的selector背景选择器

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关于listview和button都要改变android原来控件的背景，在网上查找了一些资料不是很全，所以现在总结一下android的selector的用法。首先android的selector是在drawable/xxx.xml中配置的。先看一下listview中的状态：把下面的XML文件保存成你自己命名的.xml文件（比如list_item_bg.xml），在系统使用时根据ListView中的列表项的状态来使用相应的背景图片。 drawable/list_item_bg.xml <?xml version="1.0" encoding="utf-8" ?> <selector xmlns:android="http://schemas.android.com/apk/res/android">  <item android:drawable="@drawable/pic1" />  <item android:state_window_focused="false" android:drawable="@drawable/pic1" />  <item android:state_focused="true" android:state

Performing selector at beginning / end of run loop

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问题 All events and methods in iOS are processed using NSRunLoop : user events, method calls, rotations, timers, connections, etc. My question is : How can I perform a selector in a precise moment of the run loop as the beginning and the end? 回答1: You can create a CFRunLoopObserver which will call a block on loop entry and exit. You use CFRunLoopAddObserver to add your observer to the run loop, and CFRunLoopGetMain to obtain the run loop to add to. Here is a rather pointless example using these: -

NSOpenPanel get filename in Objective-C?

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When I create an NSOpenPanel, like this: int i; NSOpenPanel* openDlg = [NSOpenPanel openPanel]; [openDlg setCanChooseFiles:YES]; [openDlg setCanChooseDirectories:YES]; if ([openDlg runModalForDirectory:nil file:nil] == NSOKButton) { NSArray* files = [openDlg filenames]; for( i = 0; i < [files count]; i++ ) { NSString* fileName = [files objectAtIndex:i]; NSLog(fileName); NSString *catched = fileName; [self performSelector:@selector(decompresss2z:) withObject:catched]; } } And when I log fileName , it is correct and prints my file full directory, but when I try to use it with my void, it gets