[Iup-users] Feedback demo program

[Robert P. <r.k...@gm...>]

I have some new input on the topic of slugish visual feedback for buttons
that are clicked quickly. I've noticed that buttons that has CANFOCUS=NO do
not suffer from this problem. I've created a small program to demonstrate
the problem. There are two buttons in the window, when BUTTON_CB is called
their TITLE changes to the status string. When they are clicked in a way,
that the status contains a 'd' (doubleclick), one of the buttons look
pushed down, and the other do not.

>From what I heard from other IUP users, this problem is not only for
IupButton:s but for some other controls as well, for example toggles.

Code below.

/Robert

/////////// Code start

#include <iup.h>
#include <string.h>
#include <stdio.h>

int btncb(Ihandle* ih,int button,int pressed,int x,int y,char* status) {
    char buf[200];

    sprintf(buf,"Status = '");
    strcat(buf,status);
    strcat(buf,"'");

    IupSetAttribute(ih,"TITLE",buf);

    return IUP_DEFAULT;
}

int main(int argc, char* argv[]) {
    Ihandle*dlg,*btn1,*btn2;
    IupOpen(0,0);

    dlg=IupDialog(
        IupVbox(
            IupLabel("Double click buttons, but do not release mouse button
on second click."),
            IupLabel("The button that can not focus looks 'Down' as
expected."),
            IupLabel("The button that cannot focus does not look pressed,"),
            IupLabel("which makes a slugish feedback feeling for"),
            IupLabel("buttons that are to be pressed multiple times
quickly."),

            IupLabel(""),
            IupLabel("This button can focus:"),
            btn1=IupButton("Status = '          '",0),
            IupLabel(""),
            IupLabel("This button can not focus:"),
            btn2=IupButton("Status = '          '",0),
            0
        )
    );

    IupSetAttribute(dlg,"TITLE","Dbl click bug demonstration");
    IupSetAttribute(dlg,"MARGIN","16x16");
    IupSetAttributes(btn1,"EXPAND=HORIZONTAL");
    IupSetAttributes(btn2,"CANFOCUS=NO,EXPAND=HORIZONTAL");
    IupSetCallback(btn1,"BUTTON_CB",(Icallback)btncb);
    IupSetCallback(btn2,"BUTTON_CB",(Icallback)btncb);

    IupShow(dlg);

    IupMainLoop();

}