mirror of https://github.com/fltk/fltk
88 lines
3.5 KiB
C++
88 lines
3.5 KiB
C++
//
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// Numeric keypad demo program for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2024 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// https://www.fltk.org/COPYING.php
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//
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// Please see the following page on how to report bugs and issues:
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//
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// https://www.fltk.org/bugs.php
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//
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//
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// Demonstrate keyboard remapping: Force number pad to type numbers even if NumLock off
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//
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// DESCRIPTION
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// -----------
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// This demonstrates several important things:
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//
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// o How to use the global event dispatcher function Fl::event_dispatch()
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//
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// o How to remap keyboard events
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//
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// o How to use Fl::event_original_key() to easily ensure the dual purpose
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// numeric keypad keys generate only numbers even if NumLock is off,
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// without affecting the dedicated Home/End/etc keys.
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//
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// Use of Fl::event_original_key() ensures someone hitting e.g. "7/Home" key
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// returns FL_KP+'7', and not FL_Home, while allowing the dedicated "Home" key
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// to still generate FL_Home. This allows users to use the "Home" and "End"
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// keys to navigate the buffer, while "7/Home" and "1/End" always type numbers.
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//
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// This demo based on fltk.general thread entitled "keyboard mapping", Aug 2019.
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//
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#include <FL/Fl.H>
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#include <FL/Fl_Double_Window.H>
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#include <FL/Fl_Input.H>
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#include <FL/Fl_Check_Button.H>
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Fl_Check_Button *G_checkbut = 0;
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// Global event handler: FLTK calls this after event translation. It's up to us
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// to call Fl::handle_(e,w) to actually deliver the event to the widgets. If we
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// don't and just return, the event will be dropped. See docs for more.
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int MyHandler(int e, Fl_Window *w) {
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// Remapping disabled? Early exit..
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if (G_checkbut->value() == 0)
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return Fl::handle_(e, w);
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// Keyboard key pressed? See if we should remap..
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if (e == FL_KEYDOWN || e == FL_KEYUP) {
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// Get FLTK keycode /before/ NumLock state is applied (see above DESCRIPTION)
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int keycode = Fl::event_original_key(); // get keycode before FLTK applies NumLock
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if (keycode >= FL_KP && keycode <= FL_KP_Last) { // keypad key pressed?
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static char buf[2]; // static: we don't want buffer to go out of scope
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buf[0] = char(keycode - FL_KP); // convert keypad keycode -> ascii
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buf[1] = 0; // terminate string (for safety)
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Fl::e_text = buf; // point to our static buffer
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Fl::e_length = 1; // only first char relevant
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Fl::e_keysym = keycode; // note: some input widgets require this too
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}
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}
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return Fl::handle_(e, w); // let FLTK deliver event to widgets
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}
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int main(int argc, char *argv[]) {
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Fl_Double_Window *win = new Fl_Double_Window(400, 150, "Keyboard Translation Test");
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win->begin();
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{
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new Fl_Input(100, 10, 200, 25, "Input:");
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G_checkbut = new Fl_Check_Button(100, 40, 280, 25, "Force numeric keypad to type numbers");
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G_checkbut->labelsize(12);
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G_checkbut->set();
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}
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win->end();
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win->resizable(win);
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win->show(argc, argv);
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win->tooltip("Turn NumLock OFF, then type into Input:\nusing numeric keypad to test translation");
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// Set up our event handler to manage events
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Fl::event_dispatch(MyHandler);
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return(Fl::run());
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}
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