keypress

问题 This: http://msdn.microsoft.com/en-us/library/system.windows.forms.control.keypress.aspx ...indicates that I should have access to e.KeyCode in the KeyPress event, but I don't seem to. I'm trying to allow only 1,2,3, and backspace: private void textBoxQH1_KeyPress(object sender, KeyPressEventArgs e) { if ((e.KeyChar != '1') && (e.KeyChar != '2') && (e.KeyChar != '3') && (e.KeyChar != (Keys.Back))) { e.Handled = true; } } ...but "e." does not show a "KeyCode" value like the example shows, and

问题 So I want to trigger an event (pausing/unpausing some media) whenever the user presses spacebar anywhere in the my Swing app. Since there are so many controls and panels that could have focus, its not really possible to add keyevents to them all(not to mention gross). So I found KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher() which is awesome, you can register global keypress pre-handlers. There's a major problem though - spaces will be typed all the time in

问题 i want to get keypress event in windows panel control in c#, is any body help for me... 回答1: You should handle the Panel.KeyPress event. Example public void MyKeyPressEventHandler(Object sender, KeyPressEventArgs e) { ... do something when key is pressed. } ... (MyPanel as Control).KeyPress += new KeyPressEventHandler(MyKeyPressEventHandler); 回答2: The problem is, that at first your main form got the KeyPress and will immediately send this message to the active control. If that doesn't handle

问题 I need to invoke a key press event in android . Any suggestions ????? 回答1: You need to use the instrumentation class : Instrumentation i = new Instrumentation(); i.sendKeyDownUpSync(KeyEvent.KEYCODE_A); This should be equivalent to a A pressed on the keyboard. 回答2: The following example shows how to invoke Key Back key event: KeyEvent eventDown = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_BACK); KeyEvent eventUp = new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_BACK);

问题 I want to submit some data to the server when a input field is blurred. The User should also be able to blur the input field by pressing enter. Unfortunately this results in the following: $rootScope:inprog: $apply already in progress error. Plunkr - thanks in advance! 回答1: Here's what's happening: You press enter ng-keydown triggers (digest begins) You call target.blur() ng-blur triggers and attempts to start another digest cycle Angular complains The blur is executed synchronously and

问题 I am trying to detect in my application, if the Enter / Return buttons are pressed. My problem is that the LVN_KEYDOWN event (Indicates that a key has been pressed) does not detect the Enter / Return key. I have seen similar questions for other languages, but can not find a solution for C++. My event to read the key press is: void ListOption::OnLvnKeydownList1(NMHDR *pNMHDR, LRESULT *pResult) { LPNMLVKEYDOWN pLVKeyDow = reinterpret_cast<LPNMLVKEYDOWN>(pNMHDR); // TODO: Add your control

问题 I want to simulate a unicode character in Mac OS X to send to the Foreground application. I mean I have a unicode char(can contain Arabic, Chinese, etc.) like 'a' and I want to input it. Please note that I am not trying to use Virtual Keys or Key Codes. Only a character. Sincerely yours, Peyman Mortazavi 回答1: I found a very good approach but there is still a problem. look at the code then I write what is the current problem. CGEventRef downEvt = CGEventCreateKeyboardEvent( NULL, 0, true );

问题 I want to simulate a unicode character in Mac OS X to send to the Foreground application. I mean I have a unicode char(can contain Arabic, Chinese, etc.) like 'a' and I want to input it. Please note that I am not trying to use Virtual Keys or Key Codes. Only a character. Sincerely yours, Peyman Mortazavi 回答1: I found a very good approach but there is still a problem. look at the code then I write what is the current problem. CGEventRef downEvt = CGEventCreateKeyboardEvent( NULL, 0, true );

问题 I have this … $(document).keypress(function(e) { if ( e.keyCode === 119 ) // w doSomething(); }); Wo when pressing "w" on my document the doSomething() function fires. How can I prevent it from firing when I'm currently typing (in focus) in an input field or textarea ? 回答1: You'll have to filter out the elements after the event and not in the selector, like this $(document).on('keypress', function(e) { var tag = e.target.tagName.toLowerCase(); if ( e.which === 119 && tag != 'input' && tag !=

问题 I need to write a Windows application which monitors keystrokes regardless of focus. When it detects a particular keystroke ( Ctrl + V , specifically), it needs to perform certain actions. How can I monitor keystrokes in Windows from C# regardless of focus? 回答1: I am not fully understand your question, but If you would like to register global key regardless of your window focus you can use RegisterHotKey windows API. 回答2: A really easy way to do it is with GetASyncKeyState. I use it only for