03913f32e0
See fltk.general, thread "Is handling simultaneous Left-click and Right-click drags supported?" from Jul 12, 2023 Status: FL_DRAG operation is terminated when one mouse button is released, even if more than one button is actually down. Subsequent mouse movement is reported as FL_MOVE rather than FL_DRAG, this is under investigation.
126 lines
3.4 KiB
C++
126 lines
3.4 KiB
C++
//
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// Event test program for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2023 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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// Build: fltk-config --compile handle_events.cxx
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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_Gl_Window.H>
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#include <FL/Fl_Button.H>
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#include <FL/names.h>
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#include <stdio.h>
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// define WINDOW_TYPE as either "Fl_Gl_Window" or "Fl_Double_Window"
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#define WINDOW_TYPE Fl_Double_Window
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// Class to handle events
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class app : public WINDOW_TYPE {
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protected:
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int handle(int) FL_OVERRIDE;
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public:
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// storage for the last event
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int eventnum, ex, ey;
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const char *eventname;
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app(int X, int Y, int W, int H, const char *L = 0)
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: WINDOW_TYPE(X, Y, W, H, L) {
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eventname = NULL;
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eventnum = 0;
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}
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// evaluates and prints the current event
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void print_event(int ev) {
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eventnum++;
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ex = Fl::event_x();
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ey = Fl::event_y();
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int screen_num = Fl_Window::screen_num();
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#if defined(FL_API_VERSION) && FL_API_VERSION >= 10400
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int scale = int(Fl::screen_scale(screen_num) * 100. + 0.5);
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#else
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int scale = 100;
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#endif
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eventname = fl_eventnames[ev];
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fprintf(stderr,
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"[%3d, win(%d,%d,%d,%d), screen %d, scale %3d%%] %-18.18s at (%4d, %4d)",
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eventnum, x(), y(), w(), h(), screen_num, scale, eventname, ex, ey);
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eventnum %= 999;
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}
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};
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// Event handling
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int app::handle(int ev) {
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print_event(ev); // common for all events
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int res = WINDOW_TYPE::handle(ev);
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int buttons = Fl::event_buttons() >> 24; // bits: 1=left, 2=middle, 4=right button
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switch (ev) {
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case FL_PUSH:
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fprintf(stderr, ", button %d down, buttons = 0x%x", Fl::event_button(), buttons);
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res = 1;
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break;
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case FL_RELEASE:
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fprintf(stderr, ", button %d up, buttons = 0x%x", Fl::event_button(), buttons);
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res = 1;
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break;
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case FL_MOUSEWHEEL:
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fprintf(stderr, ", dx = %d, dy = %d", Fl::event_dx(), Fl::event_dy());
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res = 1;
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break;
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case FL_ENTER:
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case FL_LEAVE:
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res = 1;
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break;
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case FL_MOVE:
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case FL_DRAG:
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fprintf(stderr, ", mouse buttons = 0x%x", buttons);
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res = 1;
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break;
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case FL_KEYBOARD:
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if (Fl::event_text()[0] >= 'a' && Fl::event_text()[0] <= 'z') {
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fprintf(stderr, ", Text = '%s'", Fl::event_text());
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res = 1;
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} else { // "ignore" everything else
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fprintf(stderr, ", ignored '%s'", Fl::event_text());
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}
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break;
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case FL_KEYUP:
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res = 1;
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break;
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case FL_FOCUS:
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case FL_UNFOCUS:
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res = 1;
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break;
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default:
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break;
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}
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fprintf(stderr, "\n"); fflush(stderr);
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return res;
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} /* end of handle() method */
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// Quit button callback (closes the window)
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void quit_cb(Fl_Button *b, void *) {
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b->window()->hide();
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}
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// main program
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int main(int argc, char **argv) {
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app *win = new app(10, 10, 240, 240);
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Fl_Button *quit = new Fl_Button(90, 100, 60, 40, "Quit");
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quit->box(FL_THIN_UP_BOX);
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quit->callback((Fl_Callback *)quit_cb);
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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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return Fl::run();
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}
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