keyboard-events

问题 I want to modify the use of the one of the Shift , Ctrl , Alt or Win keys. For example, if I just hit (not hold it and press another key) the right shift key, it should do something like displaying a special character in a text box. Could some one let me know if this is possible using any programming language like Java? 回答1: Yes, you can do that. Check this tutorial on how to write a Key Listener in Java + Swing . Another interesting tutorial about Key Bindings in Java + Swing that could also

问题 I override ProcessCmdKey() in my MDI parent form class and have some keyboard shortcut calling method in same class. But I wish to make these hotkeys working in parent/child form and other form. The case now is when focus on the other form(regular form, not MDI), ProcessCmdKey() doesn't capture keyboard anymore. Which class should I put ProcessCmdKey() in and anything to make it work? Thanks! namespace myNamespace { public class MDIParent : System.Windows.Forms.Form { public bool NextTab(){..

问题 I am writing a Keyboard Mapper Application in which I need to send Extended ASCII chars (0x80 to 0xFF) to Current Window. I have tried everything like below function ConstructLParam(vKey: Word): LongInt; // Cardinal; begin { ConstructLParam } if vKey > $FF then Result := LongInt(MapVirtualKeyW(vKey, 0) and $00000FFF or $F000) shl 16 or 1 else Result := LongInt(MapVirtualKey(vKey, 0) and $000000FF or $FF00) shl 16 or 1; end; { ConstructLParam } procedure PostCharacter(TargetWinHandle: Hwnd;

问题 I'm stuck with problem "keyboardWillShow" fires twice, but the "keyboardWillHide" called once. Here is an example where I'm printing the keyboard sizes as soon as "keyboardWillShow" fires. I've also put breakpoint in "viewDidLoad" and the observer registers only once. I've added two elements "UITextField" and "UITextView" and for both it is the same behaviour. I'm using iOS 9.2, swift lang., xcode 7 Below my ViewController class ViewController: UIViewController { override func viewDidLoad() {

问题 CHROME (52): When turning caps lock ON - only keydown is fired (no event in keyUp or keyPress) When turning caps lock OFF - only keyup is fired (no event in keyDown or keyPress) FIREFOX (46): Only keyDown event is fired for both caps lock ON & OFF (no keyUp or keyPress) I've read about the keyCodes and events here http://www.quirksmode.org/js/keys.html and in MDN here https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode, aaaand here http://unixpapa.com/js/key.html But none

问题 I have the following visual tree: <DockPanel> <TextBox Name="ElementWithFocus" DockPanel.Dock="Left" /> <ListBox DockPanel.Dock="Left" Width="200" KeyUp="handleListBoxKeyUp"> <ListBoxItem>1</ListBoxItem> <ListBoxItem>4</ListBoxItem> <ListBoxItem>3</ListBoxItem> <ListBoxItem>2</ListBoxItem> </ListBox> <TextBox DockPanel.Dock="Left" /> </DockPanel> handleListBoxKeyUp is the following: private void handleListBoxKeyUp(object sender, KeyEventArgs e) { if (e.Key == Key.Enter) { ((UIElement)sender)

问题 The research, the problems, the mid-age crisis There are some questions here and there about capturing the play/pause events. The solution usually relies on extending NSApplication and capturing the sendEvent. However, there are two problems with that: The iTunes opens OR some apps capture it before (Spotify I am looking at you). Damn you spotify More people were bored with iTunes opening using the play/pause, and posted in the stackoverflow. However, the solution still gets beaten by spotify

问题 I try to simulate Enter in JavaScript in a specific TextArea . This is my code: function enter1() { var keyboardEvent = document.createEvent('KeyboardEvent'); var initMethod = typeof keyboardEvent.initKeyboardEvent !== 'undefined' ? 'initKeyboardEvent' : 'initKeyEvent'; keyboardEvent[initMethod]('keydown', // event type : keydown, keyup, keypress true, // bubbles true, // cancelable window, // viewArg: should be window false, // ctrlKeyArg false, // altKeyArg false, // shiftKeyArg false, //

问题 I need to fire the Ctrl + R , Ctrl + A , Ctrl + Q events when a user clicks on a button. I was working on the following code: $(document).ready(function () { $('#Button1').click(function () { var evt = $.Event("keypress"); evt.keyCode = 81; evt.ctrlKey = true; evt.shiftKey = true; $(document).trigger(evt); }); }); 回答1: You can't simulate browser control keys, but you can simulate their effects. Ctrl - R refreshes. function refresh() { location.reload(true); } Ctrl - A selects everything. Code

问题 For a rich web application, I need keyboard shortcuts. Because there are many different keyboard layouts, they have to be configurable. Unfortunately, I can't figure out a way to map keyboard events to human-readable shortcut names such as Ctrl + Alt + Y or Alt + \ . The keypress event is useless since it doesn't fire for all keys. Here are some properties of keydown events: charCode : Works only for printable characters. Deprecated , according to MDN code : Works, but ignores the keyboard