keypress

问题 when we press a key and keep pressing it the keypress and keydown event continuously fires. Is there a way to let these fire only after a complete cycle ,eg keydown and then key up. I would like the user not to be able press the key continuously rather would like the user have to press then release the key board to type a character ! so that following case do not occur eg : pppppppppppppppppppppppp when user presses 'p' for 1 sec. 回答1: Declare a boolean isKeyDown , in the KeyDown Event, set

问题 Is there an easy way to check if a key is being pressed so I can loop through that in a thread? Preferred not to use a library and definitely not ncurses. There isn't a single thing working that I have found over the internet. 回答1: Try this:- #include <stdio.h> #include <stdlib.h> #include <sys/time.h> #include <sys/types.h> #include <unistd.h> #include <fcntl.h> #include <termios.h> int main() { struct termios oldSettings, newSettings; tcgetattr( fileno( stdin ), &oldSettings ); newSettings

问题 This is my code: private void txtAdd_KeyPress(object sender, KeyPressEventArgs e) { if (!(char.IsLetter(e.KeyChar)) && !(char.IsNumber(e.KeyChar)) && !(char.IsWhiteSpace(e.KeyChar))) { e.Handled = true; } } It allows me to enter letters, numbers and spaces but it doesn't allow me to do backspace. Please help me. 回答1: I like to use ! Char.IsControl(e.KeyChar) so that all the "control" characters like the backspace key and clipboard keyboard shortcuts are exempted. If you just want to check for

问题 I have a div element. I need to catch a mouse click on this div while alt-key (keyCode = 17) is pressed. Here is what i've got to catch key press: // Html <div id="targetDiv">I want to put a ding in the universe.</div> // Java-script $(document).ready(function(){ $(window).bind('keydown', function(event){ if ( 17 == event.keyCode ) { // How to catch mouse click on $('#targetDiv') ? } }); }); How to catch mouse click on div while alt-key is pressed? 回答1: You can check the .altKey property, for

问题 I've created a python script in which an event needs to be executed each time I press the Super (or WinKey) on my keyboard. How can one achieve this without the python process being "focused" - as it is running in the background waiting for the key to be pressed to execute the event? I've seen a lot of posts around the web showing me how to read input - but they have all required one to have the process "focused" and none have showed me how to capture the Super (or WinKey) using a python

问题 I want to be able to detect when the user presses F10 or Ctrl+F10 outside of my program, and upon receiving the key press, it will send text to whatever they currently have selected (e.g. a text box). How can this be accomplished in the simplest way? 回答1: Use RegisterHotkey and not a keyboard hook to get a global hotkey. See one of my older answers on almost the same question: listen for a key when the application is not focused 回答2: The first problem here is that the F10 key is already a

问题 I know how to have Robot simulate a Y keypress like so: Robot.keyPress(KeyEvent.VK_Y); But how do I get Robot to press a quote and period?: ". Can anyone provide me some reference page or sample code? 回答1: You can't always just use the KeyEvent.VK... variable. For example on my keyboard the "%" character is above the "5". To use a Robot to type a "5", the code would be: robot.keyPress(KeyEvent.VK_5); robot.keyRelease(KeyEvent.VK_5); and use a Robot to type a "%", the code would be: robot

问题 This is a bit of a weird one so I figure I'm either missing something obvious or this is a flaw with how these events are implemented in browsers. Let me first summarize an example scenario this issue comes up with before providing an isolated case-example; The arrow keys are used to move the player (as a handleKeyDown function is fired anytime a key is hit anywhere on the page). Likewise, anytime a key is released another function is fired (handleKeyUp). As you (the player) hold the left key

问题 For example, that when you press "Esc", the application ends. 回答1: Qt doesn't handle console events, it can just read \n -terminated lines from the console. You need to use native APIs or other libraries (curses). 回答2: Here is a workaround for linux. Using these posts Capture characters from standard input without waiting for enter to be pressed https://stackoverflow.com/a/912796/2699984 I've made it like this: ConsoleReader.h #ifndef CONSOLEREADER_H #define CONSOLEREADER_H #include <QThread>

问题 Any idea why this might happen? I would usually think that Chrome would be more forgiving with the codes? $(document).keypress(function(e) { if(e.keyCode == 39) rightImage(); if(e.keyCode == 37) leftImage(); }); Thats what my keypress key looks like. Am I missing something? rightImage(); and leftImage(); are functions which should be working becase I'm using those functions somewhere else too Thanks for the help! 回答1: Change keypress to keydown : $(document).keydown(function(e) { if(e.keyCode