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Fix numeric keyboard example program

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examples/howto-remap-numpad-keyboard-keys.cxx:

Substitute Fl::event_key() as well which is required for some input
widgets - maybe only on some platforms (seemed to work on X11 but
not on Wayland).

Also: fix typos and whitespace.
This commit is contained in:
Albrecht Schlosser 2024-01-06 17:48:41 +01:00
parent c8112003ca
commit 829cac52c6
1 changed files with 24 additions and 22 deletions
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46
examples/howto-remap-numpad-keyboard-keys.cxx
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@ -1,4 +1,19 @@
// vim: autoindent tabstop=8 shiftwidth=2 expandtab softtabstop=2 //
// Numeric keypad demo program for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2024 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
// //
// Demonstrate keyboard remapping: Force number pad to type numbers even if NumLock off // Demonstrate keyboard remapping: Force number pad to type numbers even if NumLock off
// //
@ -21,46 +36,33 @@
// //
// This demo based on fltk.general thread entitled "keyboard mapping", Aug 2019. // This demo based on fltk.general thread entitled "keyboard mapping", Aug 2019.
// //
// * * *
//
// Copyright 1998-2017 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
#include <FL/Fl.H> #include <FL/Fl.H>
#include <FL/Fl_Double_Window.H> #include <FL/Fl_Double_Window.H>
#include <FL/Fl_Input.H> #include <FL/Fl_Input.H>
#include <FL/Fl_Check_Button.H> #include <FL/Fl_Check_Button.H>
//
Fl_Check_Button *G_checkbut = 0; Fl_Check_Button *G_checkbut = 0;
// Global event handler: FLTK calls this after event translation. It's up to us // Global event handler: FLTK calls this after event translation. It's up to us
// to call Fl::handle_(e,w) to actually deliver the event to the widgets. If we // to call Fl::handle_(e,w) to actually deliver the event to the widgets. If we
// don't and just return, the event will be dropped. See docs for more. // don't and just return, the event will be dropped. See docs for more.
//
int MyHandler(int e, Fl_Window *w) { int MyHandler(int e, Fl_Window *w) {
// Remapping disabled? Early exit.. // Remapping disabled? Early exit..
if ( G_checkbut->value() == 0 ) return Fl::handle_(e, w); if (G_checkbut->value() == 0)
return Fl::handle_(e, w);
// Keyboard key pressed? See if we should remap.. // Keyboard key pressed? See if we should remap..
if ( e == FL_KEYDOWN || e == FL_KEYUP) { if (e == FL_KEYDOWN || e == FL_KEYUP) {
// Get FLTK keycode /before/ NumLock state is applied (see above DESCRIPTION) // Get FLTK keycode /before/ NumLock state is applied (see above DESCRIPTION)
int keycode = Fl::event_original_key(); // get keycode before FLTK applies NumLock int keycode = Fl::event_original_key(); // get keycode before FLTK applies NumLock
if ( keycode >= FL_KP && keycode <= FL_KP_Last ) { // keypad key pressed? if (keycode >= FL_KP && keycode <= FL_KP_Last) { // keypad key pressed?
static char buf[2]; // static: we don't want buffer to go out of scope static char buf[2]; // static: we don't want buffer to go out of scope
buf[0] = char(keycode - FL_KP); // convert keypad keycode -> ascii buf[0] = char(keycode - FL_KP); // convert keypad keycode -> ascii
buf[1] = 0; // terminate string (for safety) buf[1] = 0; // terminate string (for safety)
Fl::e_text = buf; // point to our static buffer Fl::e_text = buf; // point to our static buffer
Fl::e_length = 1; // only first char relevant Fl::e_length = 1; // only first char relevant
Fl::e_keysym = keycode; // note: some input widgets require this too
} }
} }
return Fl::handle_(e, w); // let FLTK deliver event to widgets return Fl::handle_(e, w); // let FLTK deliver event to widgets
@ -71,14 +73,14 @@ int main(int argc, char *argv[]) {
win->begin(); win->begin();
{ {
new Fl_Input(100, 10, 200, 25, "Input:"); new Fl_Input(100, 10, 200, 25, "Input:");
G_checkbut = new Fl_Check_Button(100,40,280,25," Force numeric keypad to type numbers"); G_checkbut = new Fl_Check_Button(100, 40, 280, 25, "Force numeric keypad to type numbers");
G_checkbut->labelsize(12); G_checkbut->labelsize(12);
G_checkbut->set(); G_checkbut->set();
} }
win->end(); win->end();
win->resizable(win); win->resizable(win);
win->show(argc, argv); win->show(argc, argv);
win->tooltip("Turn NumLock OFF, then type into Input:\nusing numeric keypadt to test translation"); win->tooltip("Turn NumLock OFF, then type into Input:\nusing numeric keypad to test translation");
// Set up our event handler to manage events // Set up our event handler to manage events
Fl::event_dispatch(MyHandler); Fl::event_dispatch(MyHandler);
return(Fl::run()); return(Fl::run());