keyboard-input | 易学教程

How do I read input that could be an int or a double? [duplicate]

阅读更多关于 How do I read input that could be an int or a double? [duplicate]

问题 This question already has answers here : How to test if a double is an integer (14 answers) Closed 4 years ago . I'm writing a program in which I need to take input from the keyboard. I need to take a number in, yet I'm not sure if it's an int or a double . Here's the code that I have (for that specific part): import java.io.*; import java.util.*; //... Scanner input = new Scanner(System.in); int choice = input.nextInt(); I know I can get a String and do parseInt() or parseDouble() , but I

Reading multiple simultaneous keyboard inputs using javascript

阅读更多关于 Reading multiple simultaneous keyboard inputs using javascript

问题 I've been noticing some odd behaviour with keyboard input in JavaScript. I may be missing something really obvious here, but are there some kind of rules regarding which keys are allowed to be pressed simultaneously? I'm using boolean variables to hold state for each of four keys as follows, this allows for many simultaneous key presses (hardware permitting): var up = false, left = false, right = false, space = false; function keydown(e) { if (e.keyCode == 32) space = true; if (e.keyCode ==

Flutter keyboard issue when wrap under Stack > Opacity > Scrollable

阅读更多关于 Flutter keyboard issue when wrap under Stack > Opacity > Scrollable

In flutter app, when an input field is wrapped inside Scrollable, Opacity, Stack, when keyboard appear, the scrollable view is not correctly placed. How to make the scrollable view correctly when keyboard appear? If input field is not wrapped inside Scrollable, the keyboard is not appear at all. It can be test by changing ListView with Column in the following code. import 'package:flutter/material.dart'; void main() { runApp(new MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return new MaterialApp( home: new MyHomePage(), ); } } class

Interpret enter as tab WPF

阅读更多关于 Interpret enter as tab WPF

I want to interpret Enter key as Tab key in whole my WPF application, that is, everywhere in my application when user press Enter I want to focus the next focusable control,except when button is focused. Is there any way to do that in application life circle? Can anyone give me an example? Thanks a lot! You can use my EnterKeyTraversal attached property code if you like. Add it to the top-level container on a WPF window and everything inside will treat enter as tab: <StackPanel my:EnterKeyTraversal.IsEnabled="True"> ... </StackPanel> Matt I got around woodyiii's issue by adding a

How do I make python to wait for a pressed key

阅读更多关于 How do I make python to wait for a pressed key

问题 I want my script to wait until the user presses any key. How do I do that? 回答1: In Python 3, no raw_input() exists. So, just use: input("Press Enter to continue...") In Python 2, you should use raw_input() , as input(prompt) is equivalent to eval(raw_input(prompt)) : raw_input("Press Enter to continue...") This only waits for a user to press enter though, so you might want to use msvcrt ((Windows/DOS only) The msvcrt module gives you access to a number of functions in the Microsoft Visual C/C