Re: [fltk.general] Re: Losing keyboard input under user 'spamming' input

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Re: Re: Losing keyboard input under user 'spamming' input Ian MacArthur 00:57 Sep 24 top right image
 

On Thursday, 23 September 2021 at 18:20:35 UTC+1 spitzak wrote:
I believe this is some stupidity by the X11 developers, instead of making keys repeat as they used to, X reports many key down/up pairs. There is a workaround added, I believe, to the fltk2.0 code, this needs to be copied into fltk1. Basically in the event handling when it gets a key-up, it needs to check if there is a key-down for the same key queued and instead turn it into only a repeating key-down event.

Yeah - what Bill said; peeking ahead in the queue  and eliding any KEYUP that is immediately followed by the same KEYDOWN might be the only robust solution?
Dunno...

Interestingly, I actually looked at the docs for Keyboard Events, and it includes this exhortation:

Todo: Add details on how to detect repeating keys, since on some X servers a repeating key will generate both FL_KEYUP and FL_KEYDOWN, such that to tell if a key is held, you need Fl::event_key(int) to detect if the key is being held down during FL_KEYUP or not.

I don't know who wrote that (I'm fairly sure it was not me, at any rate!) but that sounds like exactly the thing... Might be worth a try.

Meanwhile, in the interests of completeness, I added the timer check I proposed earlier. This appears to work just fine (On Windows) but today's another non-Linux day for me, so can't readily test under X11...

//////////////////////////////////
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Menu_Bar.H>

static int shown_v = 0;
/*****************************************************************************/
static bool still_pressing = false;
static bool timeout_active = false;
static void check_timeout (void *pv)
{
    if (still_pressing == true)
    {
        still_pressing = false;
        Fl::add_timeout(0.2, check_timeout, pv);
    }
    else
    {
        timeout_active = false;
        Fl_Double_Window *w = (Fl_Double_Window *)pv;
        if (shown_v) {
            w->hide();
            shown_v = 0;
        }
        else {
            w->show();
            shown_v = 1;
        }
    }
} // check_timeout

/*****************************************************************************/

class my_win : public Fl_Double_Window {

    int handle (int);

public:
    my_win(int x, int y,int w,int h,const char* L) : Fl_Double_Window(x,y,w,h,L) {};
}; // my_win

int my_win::handle (int e) {
    int ret = Fl_Double_Window::handle(e);
    if (e == FL_KEYDOWN) {
        if (Fl::event_state() & (FL_ALT)) {
            if (Fl::event_key()=='s') {
                still_pressing = true;
                if (!timeout_active)
                {
                    Fl::add_timeout(0.2, check_timeout, (void *)this);
                    timeout_active = true;
                }
                return 1;
            }
        }
    }
    else if (e == FL_KEYUP) {
        if (still_pressing)
        {
            still_pressing = false;
            return 1;
        }
    }
    return ret;
} // my_win::handle

static void toggle_win (Fl_Widget*,void* data) {
    my_win* w = static_cast<my_win*>(data);

    if (shown_v) {
        w->hide();
        shown_v = 0;
    }
    else {
        w->show();
        shown_v = 1;
    }
} // toggle_win

int main() {
    shown_v = 0;

    my_win *win2 = new my_win(0.5*Fl::w()-100,0.5*Fl::h()-100,200,200,"2nd Win");
    win2->end();

    Fl_Double_Window *win = new Fl_Double_Window(0.5*Fl::w()-200,0.5*Fl::h()-200,400,400,"Main Win");
    win->begin();
    win->box (FL_FLAT_BOX);

    Fl_Menu_Item items[] = {
        {"Menu1",0,0,0,FL_SUBMENU,0,0,FL_NORMAL_SIZE,FL_BLACK}, //0
        {"Hide/show second window",FL_ALT+'s',toggle_win,win2,0,0,0,FL_NORMAL_SIZE,FL_BLACK},
        {0,0,0,0,0,0,0,0,0},
        {0,0,0,0,0,0,0,0,0}
    };

    Fl_Menu_Bar *menu = new Fl_Menu_Bar(0, 0, win->w(),25);
    menu->box (FL_BORDER_BOX);
    menu->menu(items);
    win->end();
    win->show();

    return Fl::run();
} // main
// end of file




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