keypad

How to emulate integrated numeric keypad cursor keys in linux

由 落爺英雄遲暮 提交于 2019-12-12 17:14:46
问题 On many older laptops and some compact keyboards there is an integrated numeric keypad in the main keyboard area. This alternate keypad is activated with a special 'Fn' key next to the left Ctrl key. As a programmer I learned to use the cursor movement keys (arrows, PgUp, PgDn etc.) and found it greatly improved my programming speed. And the benefits were not bound to just a single application as is the case with specialised shortcut keys. On conventional PC keyboards, the 'Windows Key' can

Revmob banner is covering the keyboard

由 混江龙づ霸主 提交于 2019-12-11 18:04:26
问题 I have an issue with keypad. The kay pad is covered by the revmob add banner. I am using below code in Appdelegate + (void)basicUsageShowBanner { [[RevMobAds session] showBanner]; } How i can fix this issue? 回答1: This is a know bug from RevMob SDK, try to use a banner view as described on the documentation. 来源： https://stackoverflow.com/questions/19721013/revmob-banner-is-covering-the-keyboard

How to get JButtons to print integers in a JTextField by using Action Listener and Action Event?

由 99封情书 提交于 2019-12-11 16:25:55
问题 I am trying to create and hypothetical ATM GUI interface to enter in a couple of numbers through a keypad. I am having trouble having the program display the numbers after the user clicks any of the buttons. I have only created one button for time sake: public JButton jbtOne = new JButton(STANDARD_BTN_TEXTS[0][0]); So if the user clicks 'jbtOne' say 4 times. The JTextField should display 1111. My problem is that the button is unresponsive to the line of code: addActionListener(listener) How

PIC Microcontrollers: Scan inputs on a 4x4 Keypad, using only Port C RC0-RC3 in C

由 淺唱寂寞╮ 提交于 2019-12-11 11:06:10
问题 I'm new to PIC Microcontrollers & C programming and I've been set the task of creating my own Keypad scanning method that works exclusively on Port C (16F877A Microcontroller). Specifically, the program that uses this method only uses digits 1, 2, 4 and 5- so to be efficient, the scanner method is to only use RC0, RC1, RC2 and RC3 as the designated input/ outputs (I'm not allowed to use RC4-RC7). This essentially turns the 4x4 keypad into a 2x2 keypad. I understand that the concept on

How to get numeric keypad arrows working with java applications on Linux

由 不问归期 提交于 2019-12-07 01:11:55
问题 The arrow keys on the numeric keypad do not work with Java applications on Linux. Strangely enough, the Home, End, PgUp, PgDn, Ins, Del all work. This is especially annoying when using Intellij for programming. How do you get the arrow keys working? 回答1: IntelliJ (and CLion) provides the functionality to configure key mappings. Under File->Settings->Keymap->Editor actions it is possible to assign both of the keystrokes ("normal" up/down/left/right and the keypad ones) to corresponding actions

Detect backspace in UITextField on a blank textfield [duplicate]

由 佐手、 提交于 2019-11-29 11:30:17
Possible Duplicate: Detect backspace in UITextField I am trying to detect the backspace key envent on my UITextfield which is empty. I saw this but could not figure it out. Any elaborate answer or code snippet would be helpful Detect backspace in UITextField I've found it not to be possible. When the UITextField is empty, the following delegate method isn't called. - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string I conquered this by constantly having a space in the field, and when I detect a backspace and the field

boost::asio read from /dev/input/event0

由 我们两清 提交于 2019-11-29 07:48:05
I am looking to use boost::asio to read from a 12 digit keypad. I currently can do it without boost, this way: fd = open ("/dev/input/event0", 0_NONBLOCK); read (fd, &ev, sizeof ev); Do you know how I could do this with boost::asio? I am using Linux and c++. This post and this post are useful. I would not use serial port port (io, "/dev/usb/hiddev0") because its not serial, right? Thank you. On my system, event2 represents the mouse, and the following simple readloop program works like a charm. Run as root : #include <boost/asio.hpp> #include <boost/asio/posix/stream_descriptor.hpp> #include

Detect backspace in UITextField on a blank textfield [duplicate]

由 拥有回忆 提交于 2019-11-28 05:24:15
问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Detect backspace in UITextField I am trying to detect the backspace key envent on my UITextfield which is empty. I saw this but could not figure it out. Any elaborate answer or code snippet would be helpful Detect backspace in UITextField 回答1: I've found it not to be possible. When the UITextField is empty, the following delegate method isn't called. - (BOOL)textField:(UITextField *)textField

boost::asio read from /dev/input/event0

由 梦想的初衷 提交于 2019-11-28 01:46:37
问题 I am looking to use boost::asio to read from a 12 digit keypad. I currently can do it without boost, this way: fd = open ("/dev/input/event0", 0_NONBLOCK); read (fd, &ev, sizeof ev); Do you know how I could do this with boost::asio? I am using Linux and c++. This post and this post are useful. I would not use serial port port (io, "/dev/usb/hiddev0") because its not serial, right? Thank you. 回答1: On my system, event2 represents the mouse, and the following simple readloop program works like a

How to exclude special characters from android keypad for EditText

由 无人久伴 提交于 2019-11-27 09:25:18
Hi I want to show only numbers and characters on the keypad for EditText in android, I did try to add the attribute android:inputType = text|number but it did not work. Please help me with any other better suggestion. thanks in advance. try to add the digits parameter to your editText: android:digits="abcde.....012345789" Use the filter for that. Here I am adding the code for filter. EditText etName = (EditText)findViewById(R.id.etName); InputFilter filter = new InputFilter() { @Override public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
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