KeyboardLayout::~KeyboardLayout ()
{
#ifndef WINCE
ReleaseDeadKeyTables ();
#endif
}
void KeyboardLayout::LoadLayout (HKL aLayout)
{
#ifndef WINCE
PRUint32 shiftState;
BYTE kbdState [256];
BYTE originalKbdState [256];
PRUint16 shiftStatesWithDeadKeys = 0; // Bitfield with all shift states that have at least one dead-key.
PRUint16 shiftStatesWithBaseChars = 0; // Bitfield with all shift states that produce any possible dead-key base characters.
memset (kbdState, 0, sizeof (kbdState));
mActiveDeadKey = -1;
mNumOfChars = 0;
mKeyboardLayout = aLayout;
ReleaseDeadKeyTables ();
::GetKeyboardState (originalKbdState);
// For each shift state gather all printable characters that are produced
// for normal case when no any dead-key is active.
for (shiftState = 0; shiftState < 16; shiftState++)
{
SetShiftState (kbdState, shiftState);
for (PRUint32 virtualKey = 0; virtualKey < 256; virtualKey++)
{
PRInt32 vki = GetKeyIndex (virtualKey);
if (vki < 0)
continue;
NS_ASSERTION (vki < NS_ARRAY_LENGTH (mVirtualKeys), "invalid index");
PRUint16 uniChars [5];
PRInt32 rv;
rv = ::ToUnicodeEx (virtualKey, 0, kbdState, (LPWSTR)uniChars, NS_ARRAY_LENGTH (uniChars), 0, mKeyboardLayout);
if (rv < 0) // dead-key
{
shiftStatesWithDeadKeys |= 1 << shiftState;
// Repeat dead-key to deactivate it and get its character representation.
PRUint16 deadChar [2];
rv = ::ToUnicodeEx (virtualKey, 0, kbdState, (LPWSTR)deadChar, NS_ARRAY_LENGTH (deadChar), 0, mKeyboardLayout);
NS_ASSERTION (rv == 2, "Expecting twice repeated dead-key character");
mVirtualKeys [vki].SetDeadChar (shiftState, deadChar [0]);
} else
{
if (rv == 1) // dead-key can pair only with exactly one base character.
shiftStatesWithBaseChars |= 1 << shiftState;
mVirtualKeys [vki].SetNormalChars (shiftState, uniChars, rv);
}
}
}
// Now process each dead-key to find all its base characters and resulting composite characters.
for (shiftState = 0; shiftState < 16; shiftState++)
{
if (!(shiftStatesWithDeadKeys & (1 << shiftState)))
continue;
SetShiftState (kbdState, shiftState);
for (PRUint32 virtualKey = 0; virtualKey < 256; virtualKey++)
{
PRInt32 vki = GetKeyIndex (virtualKey);
if (vki >= 0 && mVirtualKeys [vki].IsDeadKey (shiftState))
{
DeadKeyEntry deadKeyArray [256];
PRInt32 n = GetDeadKeyCombinations (virtualKey, kbdState, shiftStatesWithBaseChars,
deadKeyArray, NS_ARRAY_LENGTH (deadKeyArray));
const DeadKeyTable* dkt = mVirtualKeys [vki].MatchingDeadKeyTable (deadKeyArray, n);
if (!dkt)
dkt = AddDeadKeyTable (deadKeyArray, n);
mVirtualKeys [vki].AttachDeadKeyTable (shiftState, dkt);
}
}
}
::SetKeyboardState (originalKbdState);
#endif
}
KeyboardLayout::~KeyboardLayout ()
{
ReleaseDeadKeyTables ();
}
