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Attempt to improve key event synthesis. This change adds support

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for dead keys and attempts to choose the correct code page for the
thread that will (probably) receive synthesized events.
This commit is contained in:
crs 2003-05-20 19:15:58 +00:00
parent 01fab82edc
commit bdecca0bcc
2 changed files with 258 additions and 113 deletions
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359
lib/platform/CMSWindowsSecondaryScreen.cpp
View File

@ -747,7 +747,7 @@ static const UINT g_mapEF00[] =
/* 0x64 */ 0, 0, 0, VK_APPS|0x100,
/* 0x68 */ 0, 0, VK_HELP|0x100, VK_CANCEL|0x100, 0, 0, 0, 0,
/* 0x70 */ 0, 0, 0, 0, 0, 0, 0, 0,
/* 0x78 */ 0, 0, 0, 0, 0, 0, VK_MODECHANGE|0x100, VK_NUMLOCK|0x100,
/* 0x78 */ 0, 0, 0, 0, 0, 0, 0, VK_NUMLOCK|0x100,
/* 0x80 */ VK_SPACE, 0, 0, 0, 0, 0, 0, 0,
/* 0x88 */ 0, VK_TAB, 0, 0, 0, VK_RETURN|0x100, 0, 0,
/* 0x90 */ 0, 0, 0, 0, 0, VK_HOME, VK_LEFT, VK_UP,
@ -867,94 +867,32 @@ CMSWindowsSecondaryScreen::mapKey(Keystrokes& keys, UINT& virtualKey,
return m_mask;
}
// get output mask. default output mask carries over the current
// toggle modifier states and includes desired shift, control, alt,
// meta, and super states.
KeyModifierMask outMask = (m_mask &
(KeyModifierCapsLock |
KeyModifierNumLock |
KeyModifierScrollLock));
outMask |= (mask &
(KeyModifierShift |
KeyModifierControl |
KeyModifierAlt |
KeyModifierMeta |
KeyModifierSuper));
// handle other special keys
if (virtualKey != 0) {
// compute the final desired modifier mask. special keys use
// the desired modifiers as given except we keep the caps lock,
// num lock, and scroll lock as is.
KeyModifierMask outMask = (m_mask &
(KeyModifierCapsLock |
KeyModifierNumLock |
KeyModifierScrollLock));
outMask |= (mask &
(KeyModifierShift |
KeyModifierControl |
KeyModifierAlt |
KeyModifierMeta |
KeyModifierSuper));
// set control and alt if mode shift (AltGr) is requested
if ((mask & KeyModifierModeSwitch) != 0) {
outMask |= KeyModifierControl | KeyModifierAlt;
}
// strip out extended key flag
UINT virtualKey2 = (virtualKey & ~0x100);
// extract extended key flag
const bool isExtended = ((virtualKey & 0x100) != 0);
virtualKey &= ~0x100;
// if not in map then ask system to convert character
if (virtualKey == 0) {
// translate. return no keys if unknown key.
char ascii;
wchar_t unicode = static_cast<wchar_t>(id & 0x0000ffff);
BOOL error;
if (WideCharToMultiByte(CP_THREAD_ACP,
#if defined(WC_NO_BEST_FIT_CHARS)
WC_NO_BEST_FIT_CHARS |
#endif
WC_COMPOSITECHECK |
WC_DEFAULTCHAR,
&unicode, 1,
&ascii, 1, NULL, &error) == 0 || error) {
LOG((CLOG_DEBUG2 "character %d not in code page", id));
return m_mask;
}
SHORT vk = VkKeyScan(ascii);
if (vk == 0xffff) {
LOG((CLOG_DEBUG2 "no virtual key for character %d", id));
return m_mask;
}
// use whatever shift state VkKeyScan says
// FIXME -- also for control and alt, but it's more difficult
// to determine if control and alt must be off or if it just
// doesn't matter.
outMask &= ~KeyModifierShift;
// convert system modifier mask to our mask
if (HIBYTE(vk) & 1) {
outMask |= KeyModifierShift;
}
if (HIBYTE(vk) & 2) {
outMask |= KeyModifierControl;
}
if (HIBYTE(vk) & 4) {
outMask |= KeyModifierAlt;
}
// handle combination of caps-lock and shift. if caps-lock is
// off locally then use shift as necessary. if caps-lock is on
// locally then it reverses the meaning of shift for keys that
// are subject to case conversion.
if ((outMask & KeyModifierCapsLock) != 0) {
if (tolower(ascii) != toupper(ascii)) {
LOG((CLOG_DEBUG2 "flip shift"));
outMask ^= KeyModifierShift;
}
}
// get virtual key
virtualKey = LOBYTE(vk);
}
// if in map then figure out correct modifier state
else {
// check numeric keypad. note that while KeyID distinguishes
// between the keypad movement keys (e.g. Home, left arrow),
// the virtual keys do not. however, the virtual keys do
// distinguish between keypad numbers and operators (e.g.
// add, multiply) and their main keyboard counterparts.
// therefore, we can ignore the num-lock state for movement
// virtual keys but not for numeric keys.
if (virtualKey >= VK_NUMPAD0 && virtualKey <= VK_DIVIDE) {
// check numeric keypad. note that virtual keys do not distinguish
// between the keypad and non-keypad movement keys. however, the
// virtual keys do distinguish between keypad numbers and operators
// (e.g. add, multiply) and their main keyboard counterparts.
// therefore, we can ignore the num-lock state for movement virtual
// keys but not for numeric keys.
if (virtualKey2 >= VK_NUMPAD0 && virtualKey2 <= VK_DIVIDE) {
// set required shift state based on current numlock state
if ((outMask & KeyModifierNumLock) == 0) {
if ((m_mask & KeyModifierNumLock) == 0) {
@ -968,13 +906,184 @@ CMSWindowsSecondaryScreen::mapKey(Keystrokes& keys, UINT& virtualKey,
}
}
// check for left tab
else if (id == kKeyLeftTab) {
outMask |= KeyModifierShift;
// check for left tab. that requires the shift key.
if (id == kKeyLeftTab) {
mask |= KeyModifierShift;
}
// now generate the keystrokes and return the resulting modifier mask
LOG((CLOG_DEBUG2 "KeyID 0x%08x to virtual key %d mask 0x%04x", id, virtualKey2, outMask));
return mapToKeystrokes(keys, virtualKey, m_mask, outMask, action);
}
// determine the thread that'll receive this event
// FIXME -- we can't be sure we'll get the right thread here
HWND targetWindow = GetForegroundWindow();
DWORD targetThread = GetWindowThreadProcessId(targetWindow, NULL);
// figure out the code page for the target thread. i'm just
// guessing here. get the target thread's keyboard layout,
// extract the language id from that, and choose the code page
// based on that language.
HKL hkl = GetKeyboardLayout(targetThread);
LANGID langID = static_cast<LANGID>(LOWORD(hkl));
UINT codePage = getCodePageFromLangID(langID);
LOG((CLOG_DEBUG2 "using code page %d and language id 0x%04x for thread 0x%08x", codePage, langID, targetThread));
// regular characters are complicated by dead keys. it may not be
// possible to generate a desired character directly. we may need
// to generate a dead key first then some other character. the
// app receiving the events will compose these two characters into
// a single precomposed character.
//
// as best as i can tell this is the simplest way to convert a
// character into its uncomposed version. along the way we'll
// discover if the key cannot be handled at all. we convert
// from wide char to multibyte, then from multibyte to wide char
// forcing conversion to composite characters, then from wide
// char back to multibyte without making precomposed characters.
BOOL error;
char multiByte[2 * MB_LEN_MAX];
wchar_t unicode[2];
unicode[0] = static_cast<wchar_t>(id & 0x0000ffff);
int nChars = WideCharToMultiByte(codePage,
WC_COMPOSITECHECK | WC_DEFAULTCHAR,
unicode, 1,
multiByte, sizeof(multiByte),
NULL, &error);
if (nChars == 0 || error) {
LOG((CLOG_DEBUG2 "KeyID 0x%08x not in code page", id));
return m_mask;
}
nChars = MultiByteToWideChar(codePage,
MB_COMPOSITE | MB_ERR_INVALID_CHARS,
multiByte, nChars,
unicode, 2);
if (nChars == 0) {
LOG((CLOG_DEBUG2 "KeyID 0x%08x mb->wc mapping failed", id));
return m_mask;
}
nChars = WideCharToMultiByte(codePage,
0,
unicode, nChars,
multiByte, sizeof(multiByte),
NULL, &error);
if (nChars == 0 || error) {
LOG((CLOG_DEBUG2 "KeyID 0x%08x wc->mb mapping failed", id));
return m_mask;
}
// we expect one or two characters in multiByte. if there are two
// then the *second* is a dead key. process the dead key if there.
// FIXME -- we assume each character is one byte here
if (nChars > 2) {
LOG((CLOG_DEBUG2 "multibyte characters not supported for character 0x%04x", id));
return m_mask;
}
if (nChars == 2) {
LOG((CLOG_DEBUG2 "KeyID 0x%08x needs dead key %u", id, (unsigned char)multiByte[1]));
mapCharacter(keys, multiByte[1], hkl, m_mask, mask, action);
}
// process character
LOG((CLOG_DEBUG2 "KeyID 0x%08x maps to character %u", id, (unsigned char)multiByte[0]));
virtualKey = mapCharacter(keys, multiByte[0], hkl, m_mask, mask, action);
// non-special key cannot modify the modifier mask
return m_mask;
}
UINT
CMSWindowsSecondaryScreen::mapCharacter(Keystrokes& keys,
char c, HKL hkl,
KeyModifierMask currentMask,
KeyModifierMask desiredMask, EKeyAction action) const
{
// translate the character into its virtual key and its required
// modifier state.
SHORT virtualKeyAndModifierState = VkKeyScanEx(c, hkl);
// get virtual key
UINT virtualKey = LOBYTE(virtualKeyAndModifierState);
// get the required modifier state
BYTE modifierState = HIBYTE(virtualKeyAndModifierState);
// compute the final desired modifier mask. this is the
// desired modifier mask except that the system might require
// that certain modifiers be up or down in order to generate
// the character. to start with, we know that we want to keep
// the caps lock, num lock, scroll lock modifiers as is. also,
// the system never requires the meta or super modifiers so we
// can set those however we like.
KeyModifierMask outMask = (currentMask &
(KeyModifierCapsLock |
KeyModifierNumLock |
KeyModifierScrollLock));
outMask |= (desiredMask &
(KeyModifierMeta |
KeyModifierSuper));
// win32 does not permit ctrl and alt used together to
// modify a character because ctrl and alt together mean
// AltGr. if the desired mask has both ctrl and alt then
// strip them both out.
if ((desiredMask & (KeyModifierControl | KeyModifierAlt)) ==
(KeyModifierControl | KeyModifierAlt)) {
outMask &= ~(KeyModifierControl | KeyModifierAlt);
}
// strip out the desired shift state. we're forced to use
// a particular shift state to generate the desired character.
outMask &= ~KeyModifierShift;
// use the required modifiers. if AltGr is required then
// modifierState will indicate control and alt.
if ((modifierState & 1) != 0) {
outMask |= KeyModifierShift;
}
if ((modifierState & 2) != 0) {
outMask |= KeyModifierControl;
}
if ((modifierState & 4) != 0) {
outMask |= KeyModifierAlt;
}
// handle combination of caps-lock and shift. if caps-lock is
// off locally then use shift as necessary. if caps-lock is on
// locally then it reverses the meaning of shift for keys that
// are subject to case conversion.
if ((outMask & KeyModifierCapsLock) != 0) {
// there doesn't seem to be a simple way to test if a
// character respects the caps lock key. for normal
// characters it's easy enough but CharLower() and
// CharUpper() don't map dead keys even though they
// do respect caps lock for some unfathomable reason.
// first check the easy way. if that doesn't work
// then see if it's a dead key.
unsigned char uc = static_cast<unsigned char>(c);
if (CharLower((LPTSTR)uc) != CharUpper((LPTSTR)uc) ||
(MapVirtualKey(virtualKey, 2) & 0x80000000lu) != 0) {
LOG((CLOG_DEBUG2 "flip shift"));
outMask ^= KeyModifierShift;
}
}
LOG((CLOG_DEBUG2 "KeyID %d to virtual key %d mask 0x%04x", id, virtualKey, outMask));
// now generate the keystrokes. ignore the resulting modifier
// mask since it can't have changed (because we don't call this
// method for modifier keys).
LOG((CLOG_DEBUG2 "character %d to virtual key %d mask 0x%04x", (unsigned char)c, virtualKey, outMask));
mapToKeystrokes(keys, virtualKey, currentMask, outMask, action);
return virtualKey;
}
KeyModifierMask
CMSWindowsSecondaryScreen::mapToKeystrokes(Keystrokes& keys,
UINT virtualKey,
KeyModifierMask currentMask,
KeyModifierMask desiredMask, EKeyAction action) const
{
// a list of modifier key info
class CModifierInfo {
public:
@ -996,9 +1105,12 @@ CMSWindowsSecondaryScreen::mapKey(Keystrokes& keys, UINT& virtualKey,
static const unsigned int s_numModifiers =
sizeof(s_modifier) / sizeof(s_modifier[0]);
// strip out extended key flag
UINT virtualKey2 = (virtualKey & ~0x100);
// note if the key is a modifier
unsigned int modifierIndex;
switch (virtualKey) {
switch (virtualKey2) {
case VK_SHIFT:
case VK_LSHIFT:
case VK_RSHIFT:
@ -1040,18 +1152,17 @@ CMSWindowsSecondaryScreen::mapKey(Keystrokes& keys, UINT& virtualKey,
}
const bool isModifier = (modifierIndex != s_numModifiers);
// add the key events required to get to the modifier state
// necessary to generate an event yielding id. also save the
// key events required to restore the state. if the key is
// a modifier key then skip this because modifiers should not
// modify modifiers.
// add the key events required to get to the desired modifier state.
// also save the key events required to restore the current state.
// if the key is a modifier key then skip this because modifiers
// should not modify modifiers.
Keystrokes undo;
Keystroke keystroke;
if (outMask != m_mask && !isModifier) {
if (desiredMask != currentMask && !isModifier) {
for (unsigned int i = 0; i < s_numModifiers; ++i) {
KeyModifierMask bit = s_modifier[i].m_mask;
if ((outMask & bit) != (m_mask & bit)) {
if ((outMask & bit) != 0) {
if ((desiredMask & bit) != (currentMask & bit)) {
if ((desiredMask & bit) != 0) {
// modifier is not active but should be. if the
// modifier is a toggle then toggle it on with a
// press/release, otherwise activate it with a
@ -1117,25 +1228,22 @@ CMSWindowsSecondaryScreen::mapKey(Keystrokes& keys, UINT& virtualKey,
// add the key event
keystroke.m_virtualKey = virtualKey;
if (isExtended) {
keystroke.m_virtualKey |= 0x100;
}
switch (action) {
case kPress:
keystroke.m_press = true;
keystroke.m_repeat = false;
keystroke.m_press = true;
keystroke.m_repeat = false;
keys.push_back(keystroke);
break;
case kRelease:
keystroke.m_press = false;
keystroke.m_repeat = false;
keystroke.m_press = false;
keystroke.m_repeat = false;
keys.push_back(keystroke);
break;
case kRepeat:
keystroke.m_press = true;
keystroke.m_repeat = true;
keystroke.m_press = true;
keystroke.m_repeat = true;
keys.push_back(keystroke);
break;
}
@ -1149,7 +1257,7 @@ CMSWindowsSecondaryScreen::mapKey(Keystrokes& keys, UINT& virtualKey,
// if the key is a modifier key then compute the modifier mask after
// this key is pressed.
mask = m_mask;
KeyModifierMask mask = currentMask;
if (isModifier && action != kRepeat) {
// toggle keys modify the state on release. other keys set
// the bit on press and clear the bit on release.
@ -1166,12 +1274,12 @@ CMSWindowsSecondaryScreen::mapKey(Keystrokes& keys, UINT& virtualKey,
// can't reset bit until all keys that set it are released.
// scan those keys to see if any are pressed.
bool down = false;
if (virtualKey != (modifier.m_virtualKey & 0xff) &&
if (virtualKey2 != (modifier.m_virtualKey & 0xff) &&
(m_keys[modifier.m_virtualKey & 0xff] & 0x80) != 0) {
down = true;
}
if (modifier.m_virtualKey2 != 0 &&
virtualKey != (modifier.m_virtualKey2 & 0xff) &&
virtualKey2 != (modifier.m_virtualKey2 & 0xff) &&
(m_keys[modifier.m_virtualKey2 & 0xff] & 0x80) != 0) {
down = true;
}
@ -1180,7 +1288,7 @@ CMSWindowsSecondaryScreen::mapKey(Keystrokes& keys, UINT& virtualKey,
}
}
LOG((CLOG_DEBUG2 "previous modifiers 0x%04x, final modifiers 0x%04x", m_mask, mask));
LOG((CLOG_DEBUG2 "previous modifiers 0x%04x, final modifiers 0x%04x", currentMask, mask));
return mask;
}
@ -1376,3 +1484,28 @@ CMSWindowsSecondaryScreen::sendKeyEvent(UINT virtualKey, bool press)
static_cast<BYTE>(code), flags, 0);
LOG((CLOG_DEBUG1 "send key %d, 0x%04x, %s%s", virtualKey & 0xff, code, ((flags & KEYEVENTF_KEYUP) ? "release" : "press"), ((flags & KEYEVENTF_EXTENDEDKEY) ? " extended" : "")));
}
UINT
CMSWindowsSecondaryScreen::getCodePageFromLangID(LANGID langid) const
{
// construct a locale id from the language id
LCID lcid = MAKELCID(langid, SORT_DEFAULT);
// get the ANSI code page for this locale
char data[6];
if (GetLocaleInfoA(lcid, LOCALE_IDEFAULTANSICODEPAGE, data, 6) == 0) {
// can't get code page
LOG((CLOG_DEBUG1 "can't find code page for langid 0x%04x", langid));
return CP_ACP;
}
// convert stringified code page into a number
UINT codePage = static_cast<UINT>(atoi(data));
if (codePage == 0) {
// parse failed
LOG((CLOG_DEBUG1 "can't parse code page %s for langid 0x%04x", data, langid));
return CP_ACP;
}
return codePage;
}

12
lib/platform/CMSWindowsSecondaryScreen.h
View File

@ -103,6 +103,16 @@ private:
bool press, DWORD* data) const;
KeyModifierMask mapKey(Keystrokes&, UINT& virtualKey, KeyID,
KeyModifierMask, EKeyAction) const;
UINT mapCharacter(Keystrokes& keys,
char c, HKL hkl,
KeyModifierMask currentMask,
KeyModifierMask desiredMask,
EKeyAction action) const;
KeyModifierMask mapToKeystrokes(Keystrokes& keys,
UINT virtualKey,
KeyModifierMask currentMask,
KeyModifierMask desiredMask,
EKeyAction action) const;
void doKeystrokes(const Keystrokes&, SInt32 count);
void toggleKey(UINT virtualKey, KeyModifierMask mask);
@ -110,6 +120,8 @@ private:
bool isExtendedKey(UINT virtualKey) const;
void sendKeyEvent(UINT virtualKey, bool press);
UINT getCodePageFromLangID(LANGID) const;
private:
CMutex m_mutex;
CMSWindowsScreen* m_screen;