| [AD] [ alleg-Bugs-2889063 ] Keyboard behaviour differs |
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Bugs item #2889063, was opened at 2009-10-29 21:31
Message generated for change (Comment added) made by allefant
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Category: None
Group: 4.3.10plus
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Christer Sandberg (chrisan)
Assigned to: Nobody/Anonymous (nobody)
Summary: Keyboard behaviour differs
Initial Comment:
The attached program gives different output on different platforms when typing the AltGr-key combined with some other key. My windows laptop (old) prints 6 for the key_shifts (i.e. ctrl + alt) while a Linux desktop prints 20 (i.e. "KB_MENU_FLAG" (is that "KB_ALT_GR"?)).
I have Swedish keyboard on both.
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Comment By: Elias Pschernig (allefant)
Date: 2009-10-30 13:45
Message:
The relevant code for X11 is in src/x/xkeyboard.c:
/* Table of: Allegro's modifier flag, associated X11 flag, toggle method.
*/
static int modifier_flags[8][3] = {
{KB_SHIFT_FLAG, ShiftMask, 0},
{KB_CAPSLOCK_FLAG, LockMask, 1},
{KB_CTRL_FLAG, ControlMask, 0},
{KB_ALT_FLAG, Mod1Mask, 0},
{KB_NUMLOCK_FLAG, Mod2Mask, 1},
{KB_SCROLOCK_FLAG, Mod3Mask, 1},
{KB_LWIN_FLAG | KB_RWIN_FLAG, Mod4Mask, 0}, /* Should we use only one?
*/
{KB_MENU_FLAG, Mod5Mask, 0} /* AltGr */
};
X11 only knows about ShiftMask, LockMask, ControlMask, Mod[12345]Mask -
in the above table we map the X11 control key masks to the Allegro one. I
wouldn't mind a patch which makes Mod5Mask instead trigger CTRL and ALT as
in Windows if you think that's better - however Mod5Mask does not always
correspond to AltGr.
In general, for a game, it's best to only use the key[] array (or better
the keyboard callback) for controls. And in text applications, only use the
unicode symbols. Relying on key_shifts just asks for troubled users.
----------------------------------------------------------------------
Comment By: Christer Sandberg (chrisan)
Date: 2009-10-30 07:01
Message:
- The Windows system on the laptop is XP
- In case the AltGr key is not present on all kinds of keyboard layouts:
This is the key immediately to the right of the space bar.
- The complete output when running on the Windows machine is: 6 0 ffffffff
0 0, i.e. the key array reflects the state correctly while key_shifts
doesn't.
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