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Display mouse button state in test/handle_events.cxx demo 

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.
This commit is contained in:
Albrecht Schlosser 2023-07-12 19:32:02 +02:00
parent 44840af076
commit 03913f32e0
1 changed files with 8 additions and 4 deletions
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12
test/handle_events.cxx
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@ -1,7 +1,7 @@
//
// Event test program for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2021 by Bill Spitzak and others.
// Copyright 1998-2023 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
@ -14,7 +14,7 @@
// https://www.fltk.org/bugs.php
//
// compile standalone as: fltk-config --compile handle_events.cxx
// Build: fltk-config --compile handle_events.cxx
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
@ -62,13 +62,14 @@ public:
int app::handle(int ev) {
print_event(ev); // common for all events
int res = WINDOW_TYPE::handle(ev);
int buttons = Fl::event_buttons() >> 24; // bits: 1=left, 2=middle, 4=right button
switch (ev) {
case FL_PUSH:
fprintf(stderr, ", button %d down", Fl::event_button());
fprintf(stderr, ", button %d down, buttons = 0x%x", Fl::event_button(), buttons);
res = 1;
break;
case FL_RELEASE:
fprintf(stderr, ", button %d up", Fl::event_button());
fprintf(stderr, ", button %d up, buttons = 0x%x", Fl::event_button(), buttons);
res = 1;
break;
case FL_MOUSEWHEEL:
@ -77,8 +78,11 @@ int app::handle(int ev) {
break;
case FL_ENTER:
case FL_LEAVE:
res = 1;
break;
case FL_MOVE:
case FL_DRAG:
fprintf(stderr, ", mouse buttons = 0x%x", buttons);
res = 1;
break;
case FL_KEYBOARD: