keypress

问题 I have a MDI parent form. When user presses Enter I want the Application to shut down. I check the keydown event as follows: private void MainForm_KeyDown(object sender, KeyEventArgs e) { if (e.KeyValue == (int)Keys.Enter) { Application.Exit(); } } Now it works fine, when I don't have any clickable controls on form (Button, TextBox etc). The e.KeyValue has the (int) value of Enter Key (13). But if I put some buttons or textboxes on to MDI Form, e.KeyValue brings the keyvalue of Alt Key i.e.

问题 Good morning, I facing a issue on the IE 10 where my keypress still can enter '%' but the FF and Chrome no such issue. I found out that the key 37 is the [ left arrow ] which match with '%' in ASCII. My sample code as below: $('#refId').bind("keypress", function(event) { // allow letters, numbers and keypad numbers ONLY var key = event.charCode; if((key >= 48 && key <= 57) || (key >= 65 && key <= 90) || (key >= 97 && key <= 122)){ return true; } //allow backspace, tab, left arrows, right

问题 I've searched for a while to find a function in Windows systems to use in C programming, to determine which key was pressed, without requiring the 'enter' key for confirmation. I've found kbhit() , but this only returns positive on key press, and 0 while no key-press. I'd like the same behavior on a function, but returning my key's ASCII code. The reason is that I want to build some controls, on a console-based game, where I need arrows to navigate the player. 'A' would move my point left, 'D

问题 So I desired to remove the ugly dotted border on my QTreeWidget by setting NoFocus on the focus policy. Now I need to catch keyPressEvents, but the focus policy is preventing that. Any ideas how one might circumvent this catch 22 so that I can catch a delete key press for easy item deletion? Thanks in advance! 回答1: I assume you are trying to do something that you really shouldn't, but anyways … This is the way to go: http://doc.qt.io/qt-4.8/qwidget.html#grabKeyboard 来源： https://stackoverflow

问题 I have this input which is to capture a phone number. When the user enters a number and press the "Enter" Key the Method "KeyWasPressed" is triggered and some validation happens. this works as expected BUT... When the user copies and pastes the number from excel, for example, the variable @Phone doesn't updates its value so when the user presses the "Enter" key the validation sends and empty value. Is there a way to refresh/update @Phone variable when some text is pasted to the input control?

问题 I'm using the following code to detect users' key pressing, in JavaScript: $(document).bind('keydown', function (event) { 'use strict'; var keyCode = event.keyCode; switch (keyCode) { case '{N}': doSomething(); break; default: break; } }); Where doSomething is a previously defined function and {N} is any of the JavaScript Char Codes. It works properly in every major browser, but in Opera even if a key remains pressed, it only calls doSomething once, instead of doing it until the key is

问题 I am trying to control google earth using the arrow keys, however, I want to do this with applescript. Essentially this code should work and I'll tell you what it actually does. tell application "System Events" delay 3 key down 124 #Value of key right delay 3 key up 124 end tell This code should wait for me to go to google earth, then it will hold the right arrow key for 3 seconds. However, it just hits 'a'. I saw some recommendations to do the following: key down (key code 124) This sort of

问题 $('tbl').on('click', 'tbody tr', function(e) { if (e.ctrlKey) { //fancybox 1 to be appeared } if(e.shiftKey) { //fancybox 2 to be appeared } }); Finding an issue as below: //comment having a problem using this, because I even have to render response from the fancybox and display in the td.. when i click it by ctrl+click then I am getting the form load which I seen through debugging tool but sometimes it display the fancybox. //comment end I have used the above coding in a table id tbl and

问题 I am using Ubuntu 14.04, and I am setting up a virtual keyboard in c, which requires uinput to work. My program is supposed to send the key 'a' to terminal, as it would when I would press the 'a' key on the keyboard. Here's my source code: int main() { int uinp_fd; int i; /********** Open uinput file section. **********************/ uinp_fd = open("/dev/uinput", O_WRONLY|O_NDELAY); if(uinp_fd < 0) { printf("Unable to open /dev/uinput\n"); return -1; } else printf("Can open /dev/uinput\n"); /*

问题 I have a class named ValidableComboBox that derives directly from QComboBox . Every instance of ValidableComboBox has setEditable() set to true . My goal is to add some signal that will be emitted whenever someone presses return key in the QComboBox . To do so, I reimplemented void KeyPressEvent(QKeyEvent* e) in ValidableComboBox . However, it seems that it never gets called when I type something into the combobox. Is there a way to achieve this ? What could possibly be wrong with what I have