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QWindowsKeyMapper: Added some comments about functionality + cleanup 

Change-Id: Ieabdea7601ea0eba08eac701b2fdf27b4cd2ff45
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
bb10
Oliver Wolff 2013-10-25 14:43:42 +01:00 committed by The Qt Project
parent c760d2dbfd
commit a0da5290ff
2 changed files with 14 additions and 26 deletions
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38
src/plugins/platforms/windows/qwindowskeymapper.cpp
View File

@ -97,6 +97,8 @@ struct KeyRecord {
QString text;
};
// We need to record the pressed keys in order to decide, whether the key event is an autorepeat
// event. As soon as its state changes, the chain of autorepeat events will be broken.
static const int QT_MAX_KEY_RECORDINGS = 64; // User has LOTS of fingers...
struct KeyRecorder
{
@ -503,12 +505,6 @@ static inline int toKeyOrUnicode(int vk, int scancode, unsigned char *kbdBuffer,
return code == Qt::Key_unknown ? 0 : code;
}
int qt_translateKeyCode(int vk)
{
int code = winceKeyBend((vk < 0 || vk > 255) ? 0 : vk);
return code == Qt::Key_unknown ? 0 : code;
}
static inline int asciiToKeycode(char a, int state)
{
if (a >= 'a' && a <= 'z')
@ -554,12 +550,8 @@ void QWindowsKeyMapper::changeKeyboard()
keyboardInputDirection = bidi ? Qt::RightToLeft : Qt::LeftToRight;
}
void QWindowsKeyMapper::clearRecordedKeys()
{
key_recorder.clearKeys();
}
// Helper function that is used when obtaining the list of characters that can be produced by one key and
// every possible combination of modifiers
inline void setKbdState(unsigned char *kbd, bool shift, bool ctrl, bool alt)
{
kbd[VK_LSHIFT ] = (shift ? 0x80 : 0);
@ -570,6 +562,7 @@ inline void setKbdState(unsigned char *kbd, bool shift, bool ctrl, bool alt)
kbd[VK_MENU ] = (alt ? 0x80 : 0);
}
// Adds the msg's key to keyLayout if it is not yet present there
void QWindowsKeyMapper::updateKeyMap(const MSG &msg)
{
unsigned char kbdBuffer[256]; // Will hold the complete keyboard state
@ -578,6 +571,9 @@ void QWindowsKeyMapper::updateKeyMap(const MSG &msg)
updatePossibleKeyCodes(kbdBuffer, scancode, msg.wParam);
}
// Fills keyLayout for that vk_key. Values are all characters one can type using that key
// (in connection with every combination of modifiers) and whether these "characters" are
// dead keys.
void QWindowsKeyMapper::updatePossibleKeyCodes(unsigned char *kbdBuffer, quint32 scancode,
quint32 vk_key)
{
@ -598,6 +594,10 @@ void QWindowsKeyMapper::updatePossibleKeyCodes(unsigned char *kbdBuffer, quint32
buffer[VK_RCONTROL] = 0;
buffer[VK_LMENU ] = 0; // Use right Alt, since left Ctrl + right Alt is considered AltGraph
// keyLayout contains the actual characters which can be written using the vk_key together with the
// different modifiers. '2' together with shift will for example cause the character
// to be @ for a US key layout (thus keyLayout[vk_key].qtKey[1] will be @). In addition to that
// it stores whether the resulting key is a dead key as these keys have to be handled later.
bool isDeadKey = false;
keyLayout[vk_key].deadkeys = 0;
keyLayout[vk_key].dirty = false;
@ -635,7 +635,8 @@ void QWindowsKeyMapper::updatePossibleKeyCodes(unsigned char *kbdBuffer, quint32
}
keyLayout[vk_key].qtKey[8] = fallbackKey;
// If this vk_key makes a dead key with any combination of modifiers
// If one of the values inserted into the keyLayout above, can be considered a dead key, we have
// to run the workaround below.
if (keyLayout[vk_key].deadkeys) {
// Push a Space, then the original key through the low-level ToAscii functions.
// We do this because these functions (ToAscii / ToUnicode) will alter the internal state of
@ -661,17 +662,6 @@ void QWindowsKeyMapper::updatePossibleKeyCodes(unsigned char *kbdBuffer, quint32
}
}
bool QWindowsKeyMapper::isADeadKey(unsigned int vk_key, unsigned int modifiers)
{
if ((vk_key < NumKeyboardLayoutItems) && keyLayout[vk_key].exists) {
for (size_t i = 0; i < NumMods; ++i) {
if (uint(ModsTbl[i]) == modifiers)
return bool(keyLayout[vk_key].deadkeys & 1<<i);
}
}
return false;
}
static inline QString messageKeyText(const MSG &msg)
{
const QChar ch = QChar((ushort)msg.wParam);

2
src/plugins/platforms/windows/qwindowskeymapper.h
View File

@ -100,9 +100,7 @@ private:
QLocale keyboardInputLocale;
Qt::LayoutDirection keyboardInputDirection;
void clearRecordedKeys();
void updatePossibleKeyCodes(unsigned char *kbdBuffer, quint32 scancode, quint32 vk_key);
bool isADeadKey(unsigned int vk_key, unsigned int modifiers);
void deleteLayouts();
QWindow *m_keyGrabber;