keyboard-events | 易学教程

How to get keypressed, keydown events from DataGridView data cells

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问题 I need to receive the key press events during cell editing in DataGridView control. From what I have found on the net the DataGridView is designed to pass all key events from DataGridView to the cell editing control and you cannot get these events easily. I found this piece of code that traps those events for DataGrid control, but that does not work for DataGridView . 回答1: Try this: class KeyPressAwareDataGridView : DataGridView { protected override void OnControlAdded(ControlEventArgs e) {

macOS App: handling key combinations bound to global keyboard shortcuts

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问题 In some apps, it makes sense for the app to directly handle keyboard shortcuts which are otherwise bound to system wide combinations. For example, ⌘-Space (normally Spotlight) or ⌘-Tab (normally app switcher). This works in various Mac apps, such as VMWare Fusion, Apple's own Screen Sharing and Remote Desktop clients (forwarding the events to the VM or server, respectively, instead of handling them locally), and also some similar third-party apps in the App Store. We would like to implement

How to make AlertDialog view in Input method Service?

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问题 I would like to make an input method which is used only for SoftKeyboard. My how to make popup onkey event in input method. I am creating Dialog but here is problem you see my logcat: 09-14 11:16:54.349: E/MessageQueue-JNI(7172): at android.inputmethodservice.KeyboardView.detectAndSendKey(KeyboardView.java:824) Softkeyboard.java Here java code public void onKey(int primaryCode, int[] keyCodes) { if (primaryCode == -2) { // add this to your code dialog = builder.create(); Window window =

onKeyUp not firing for ESC in IE

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问题 I have a page where I have to close a dialog when Esc is pressed. I wrote the following simplified code example for this task: <html> <head> <script language="JavaScript"> function keyUpExample() { alert('on' + event.type + ' event fired by ' + '"' + event.srcElement.id + '" ' + ' ' + event.which) } </script> </head> <body id="myBody" onkeyup="keyUpExample()"> Trying keyUp event: Press any key... </body> </html> This works as expected under Chrome but is NOT working under IE 7. Is there any

Cross-browser handling the “Enter” key pressing using Javascript

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问题 I have got the following sample, that easily detects the "Enter" key pressing and handles it correctly. Here it is: <!DOCTYPE html> <html> <head> <title>keyCode example</title> <script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script> <script type="text/javascript"> $(document).ready(function () { $("#search-input").keyup(function (event) { event = event || window.event; if (event.keyCode == 13 || event.which == 13) { $("#search-button").click(); } }); $("

KeyDown event not raising from a grid

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问题 Here I have sample window with a grid. I need to capture event when key is pressed. But it is not raising when I click grid area and then press key. It will work only if Textbox is focused. I know it will work if I capture it from Window. But I have other application with few usercontrols and I need to capture it from distinct ones. I tried to set Focusable.false for Window and true for Grid but it not helps. Any solutions? <Window x:Class="Beta.MainWindow" xmlns="http://schemas.microsoft.com

shift mouse click trigger

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问题 I can trigger click event on element selector using trigger $('element selector').trigger('click') Is it possible to trigger shift click. I mean shift + left mouse click. 回答1: try var shiftClick = jQuery.Event("click"); shiftClick.shiftKey = true; $("element selector").click(function(event) { if (event.shiftKey) { alert("Shift key is pressed"); } else { alert('No shift hey'); } }); $("element selector").trigger(shiftClick); JSFiddle 回答2: You can check event.shiftKey boolean propery. $(

iPad split-keyboard

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问题 I am creating an app similar to the iPad's iMessage app that does messaging. So there is an input view anchored at the bottom of the message view and input accessory view when the keyboard is shown. Also the message view must be resized properly when the keyboard is shown while docked or undocked. The problem I have is that the notification data that comes in from UIKeyboardWillChangeFrameNotification is not consistent. First, there are 3 ways that the user can undock the keyboard: Press-and

Need to intercept HID Keyboard events (and then block them)

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问题 I've got a RFID USB device that registers as a HID device (A USB Keyboard more or less). I'm looking for a way to capture this input, and block/filter it before it hits the normal keyboard event handler (and outputs the 10 digit RFID code to the console). I would of course have to exclusively capture just this device, and leave the real keyboard input alone (or pass it along). My initial idea was to block the device in UDEV (So the usbhid/event/kbd kernel module didn't bind to it) and write

How to detect backspace in a keyTypedEvent

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问题 I'm using Netbeans' bean form to create my GUI. I've added a keyTyped event to a JTextArea and I want to detect if the typed key is a Backspace . I'm using keyTyped event for other reasons so I cannot just use the keyPressed event. This is the generated code (and my if check): private void langArea1KeyTyped(java.awt.event.KeyEvent evt) { if(evt.getChar()== backspace) //how can I make this check? } evt.getKeyCode() always returns 0 independent of the typed key. evt.getKeyChar() simply deletes