01-17-2019
Quote:
Originally Posted by
joeyg
I did a little testing of various scenarios, and perhaps no easy way around the 'captcha', but if I pick a username already in use (but do not know this) and go through all the steps including the captcha... then the computer tells me the username is taken, I must go through the captcha all over again. It does not remember that I am human.
As I said, maybe a side-effect of the 'captcha'; but I sense people picking usernames already taken and thus having to do it all over again each time.
OK... I added new code to check the username during registration, adding some color checks and dialog:
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LEARN ABOUT OSF1
xtremovegrab
XtAddGrab(3Xt) XtAddGrab(3Xt)
NAME
XtAddGrab, XtRemoveGrab - redirect user input to a modal widget
SYNOPSIS
void XtAddGrab(w, exclusive, spring_loaded)
Widget w;
Boolean exclusive;
Boolean spring_loaded;
void XtRemoveGrab(w)
Widget w;
ARGUMENTS
Specifies whether user events should be dispatched exclusively to this widget or also to previous widgets in the cascade. Specifies
whether this widget was popped up because the user pressed a pointer button. Specifies the widget to add to or remove from the modal cas-
cade.
DESCRIPTION
The XtAddGrab function appends the widget (and associated parameters) to the modal cascade and checks that exclusive is True if
spring_loaded is True. If these are not True, XtAddGrab generates an error.
The modal cascade is used by XtDispatchEvent when it tries to dispatch a user event. When at least one modal widget is in the widget cas-
cade, XtDispatchEvent first determines if the event should be delivered. It starts at the most recent cascade entry and follows the cascade
up to and including the most recent cascade entry added with the exclusive parameter True.
This subset of the modal cascade along with all descendants of these widgets comprise the active subset. User events that occur outside the
widgets in this subset are ignored or remapped. Modal menus with submenus generally add a submenu widget to the cascade with exclusive
False. Modal dialog boxes that need to restrict user input to the most deeply nested dialog box add a subdialog widget to the cascade with
exclusive True. User events that occur within the active subset are delivered to the appropriate widget, which is usually a child or fur-
ther descendant of the modal widget.
Regardless of where on the screen they occur, remap events are always delivered to the most recent widget in the active subset of the cas-
cade that has spring_loaded True, if any such widget exists.
The XtRemoveGrab function removes widgets from the modal cascade starting at the most recent widget up to and including the specified wid-
get. It issues an error if the specified widget is not on the modal cascade.
SEE ALSO
X Toolkit Intrinsics -- C Language Interface
Xlib -- C Language X Interface
XtAddGrab(3Xt)