keydown

keyDown not being called

拥有回忆 提交于 2019-11-27 06:11:09
问题 I have a custom NSView called SurfaceView. It is the contentView of a NSWindow and it handles basic events like mouse click and drawing. But don't matters what I do, it does not handle the keyDown function. I've already override the acceptsFirstResponder but nothing happens. If it matters, I run the application using a custom NSEvent loop, shown below: NSDictionary* info = [[NSBundle mainBundle] infoDictionary]; NSString* mainNibName = [info objectForKey:@"NSMainNibFile"]; NSApplication* app

How to use pygame.KEYDOWN?

青春壹個敷衍的年華 提交于 2019-11-27 05:31:00
So, my question was most likely already asked, but I didn't know what to search for, and didnt find much. So, my problem is, I made 2 functions, which would check for an event def get_pygame_events(): pygame_events = pygame.event.get() return pygame_events and def get_keys_pressed(self): keys_pressed = get_pygame_events() #pygame.event.get(pygame.KEYDOWN) # print(keys_pressed) keys_pressed_list = [] for event in keys_pressed: if event.type == pygame.KEYDOWN: if event.key == K_LEFT: keys_pressed_list.append("left") if event.key == K_RIGHT: keys_pressed_list.append("right") if event.key == K_UP:

How do i capture the Print Screen key?

微笑、不失礼 提交于 2019-11-27 04:35:25
问题 I my program I need to capture when the Print Screen key is pressed down but it is not working (however it works with other keys). I guess this has something to do with windows hijacking my authority and since im still new at this I'd love to know how I can get around this issue. Here's my current code: namespace Boom_Screenshot_ { /// <summary> /// Interaction logic for Window1.xaml /// </summary> public partial class Window1 : Window { //SETTINGS Key TRIGGER_KEY = Key.PrintScreen; public

How do I capture Keys.F1 regardless of the focused control on a form?

半世苍凉 提交于 2019-11-27 04:22:22
I used KeyDown event and some simple code like if (e.KeyCode == Keys.F1) to capture F1 is pressed on a form BUT if there are some text boxes on the form or if there are some spreadsheets with Dock Fill on the form then the code above gets useless and does nothing. But I want to do something when user presses F1 on this form. so how do we capture a specific keydown event like F1 on the whole form..and I do not want to go to the route that capture the KeyDown of all other controls on the form and pass them to the Form for processing. is there any cleaner way to do this? Cody Gray Yes, indeed

jQuery key code for command key

白昼怎懂夜的黑 提交于 2019-11-27 03:33:25
I have read jQuery Event Keypress: Which key was pressed? and How can i check if key is pressed during click event with jquery? However my question is if you can get the same key event for all browsers? Currently I know that Firefox gives the command button (Mac) the code 224 while Chrome and Safari give it the value 91. Is the best approach to simply check what browser the user is using and base the key pressed on that or is there a way so that I can get 1 key code across all browsers? Note I am getting the value with the: var code = (evt.keyCode ? evt.keyCode : evt.which); I would love to

Cancel the keydown in HTML

流过昼夜 提交于 2019-11-27 02:04:43
How can I cancel the keydown of a specific key on the keyboard, for example(space, enter and arrows ) in an HTML page. If you're only interested in the example keys you mentioned, the keydown event will do, except for older, pre-Blink versions of Opera (up to and including version 12, at least) where you'll need to cancel the keypress event. It's much easier to reliably identify non-printable keys in the keydown event than the keypress event, so the following uses a variable to set in the keydown handler to tell the keypress handler whether or not to suppress the default behaviour. var

Detecting “value” of input text field after a keydown event in the text field?

橙三吉。 提交于 2019-11-27 00:56:15
问题 So my site has an input box, which has a onkeydown event that merely alerts the value of the input box. Unfortunately the value of the input does not include the changes due to the key being pressed. For example for this input box: <input onkeydown="alert(this.value)" type="text" value="cow" /> The default value is "cow". When you press the key "s" in the input, you get an alert("cow") instead of an alert("cows"). How can I make it alert("cows") without using onkeyup ? I don't want to use

Android - capture/suppress Home and EndCall buttons events?

好久不见. 提交于 2019-11-26 23:42:52
问题 If you ever tried to write a locker app on Android sure you meet this problem: boolean mBackPressed = false; @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (event.getAction() == KeyEvent.ACTION_DOWN) { switch (keyCode) { case KeyEvent.KEYCODE_BACK: mBackPressed = true; break; case KeyEvent.KEYCODE_MENU: if (mBackPressed) unLock(); break; default: mBackPressed = false; showMessage(); break; } } return true; } private void showMessage() { Toast.makeText(getBaseContext(),

onKeyDown event not working on divs in React

一笑奈何 提交于 2019-11-26 22:37:56
问题 I want to use a keyDown event on a div in React. I do: componentWillMount() { document.addEventListener("keydown", this.onKeyPressed.bind(this)); } componentWillUnmount() { document.removeEventListener("keydown", this.onKeyPressed.bind(this)); } onKeyPressed(e) { console.log(e.keyCode); } render() { let player = this.props.boards.dungeons[this.props.boards.currentBoard].player; return ( <div className="player" style={{ position: "absolute" }} onKeyDown={this.onKeyPressed} // not working >

What's the theory behind jQuery keypress, keydown, keyup black magic (on Macs)? [closed]

前提是你 提交于 2019-11-26 22:32:28
问题 I am confused about the various behaviors of keypress , keydown , and keyup . It seems that I have missed an important piece of documentation, one that explains the subtleties and nuances of this trio. Could someone help me to figure out which document I need to read in order to more effectively use these events? In case you want details, see below. @o.v.: you asked me to show some code, but it's not really a specific problem in the code that I'm trying to solve. I'm trying to get a handle on