[fltk.bugs] [MOD] STR #2233: Using F2/F3 keys in fluid can cause selected item to disappear
DO NOT REPLY TO THIS MESSAGE. INSTEAD, POST ANY RESPONSES TO THE LINK BELOW. [STR New] Link: http://www.fltk.org/str.php?L2233 Version: 1.3-current When many items are in the fluid browser, selecting the second item down from the top, and hitting the F2 key to 'move it up' to the top causes the item to seem to 'disappear'. The item is really 'at the top', but the scrollbar won't let you scroll up to see it. However, if you scroll down, then up again, then you can see it. It's a weird hiccup, probably something to do with Fl_Browser's scrollbar calculations.. not sure. To replicate, basically fill the browser with items until a scrollbar appears, scroll to the top, select the second item, and try to 'move it up' to the top with the F2 key. Link: http://www.fltk.org/str.php?L2233 Version: 1.3-current ___ fltk-bugs mailing list fltk-bugs@easysw.com http://lists.easysw.com/mailman/listinfo/fltk-bugs
Re: [fltk.bugs] [HIGH] STR #2232: FLTK1/2 X11 keyboard handling broken if using a soft keyboard
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[STR New]
Link: http://www.fltk.org/str.php?L2232
Version: 1.3-current
Link: http://www.fltk.org/str.php?L2232
Version: 1.3-current#include stdio.h
#include Xlib.h
#include XTest.h
int main(void)
{
Display *display;
int i;
KeyCode keycode;
/* Connect to the server specified in the DISPLAY evironment variable */
display = XOpenDisplay(NULL);
if (display == NULL)
{
fprintf (stderr, Cannot connect to X server %s.\n,
XDisplayName(NULL));
return;
}
if (!XQueryExtension (display, XTEST, i, i, i))
{
fprintf (stderr, Extension XTest unavailable on display '%s'.\n,
XDisplayName(NULL));
XCloseDisplay (display);
return;
}
unsigned char keycodes[] = {0x3a, 0x20, 0x1b, 0x39, 0x1f, 0x39, 0x2a, 0x41};
for(i=0; isizeof(keycodes); i++)
{
XTestFakeKeyEvent(display, keycodes[i], 1, 0);
XTestFakeKeyEvent(display, keycodes[i], 0, 0);
}
XCloseDisplay (display);
}
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[fltk.bugs] [HIGH] STR #2232: FLTK1/2 X11 keyboard handling broken if using a soft keyboard
DO NOT REPLY TO THIS MESSAGE. INSTEAD, POST ANY RESPONSES TO THE LINK BELOW. [STR New] Link: http://www.fltk.org/str.php?L2232 Version: 1.3-current I'm seeing a problem with the low-level keyboard handling in both FLTK1 and FLTK2. If using a program that artificially generates X11 keystrokes to type any word with non-consecutive, repeated letters into an FLTK app, FLTK transposes the letters. An example of such a keystroke-generating application is a soft keyboard, such as those used on touchscreen phones. A keyboard that uses a dictionary to type a word-at-a-time types the letters in a quick succession, triggering this bug. I'm attaching 2 test programs to demonstrate the issue, one in C and another in Perl. Both use XTest to type morning (assuming a standard keyboard). This works fine when typing into an app not built with FLTK, but FLTK often produces mornnig instead. This is sensitive to timing, so the bug doesn't occur 100% of the time, but quite often on my computer. The cause of the issue is code in FLTK to handle key repeats. When a key is held down, X sends repeated press and release events. FLTK fights this by looking into the X event queue to detect this condition, and to pull out press events to process them earlier. Thus, the second n in morning moves up in the queue to produce the error. In FLTK1, this behavior was introduced in revision 2937 (this revision has no other changes). In FLTK2, almost-identical behavior was introduced in revision 2944. I must admit I don't understand why FLTK doesn't want to handle repeated press and release events that X generates. A quick test with that code pulled out didn't reveal any breakage, but I didn't try for very long. We can pull out this code permanently if the issue no longer exists (the code was written in 2003). Otherwise, we can make fake_keyup_test() smarter by preventing it from triggering if different keys are seen in the queue in-between the repeating keys. Link: http://www.fltk.org/str.php?L2232 Version: 1.3-current type_morning.pl Description: Binary data ___ fltk-bugs mailing list fltk-bugs@easysw.com http://lists.easysw.com/mailman/listinfo/fltk-bugs
