tkUnixKey.c
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- /*
- * tkUnixKey.c --
- *
- * This file contains routines for dealing with international keyboard
- * input.
- *
- * Copyright (c) 1997 by Sun Microsystems, Inc.
- *
- * See the file "license.terms" for information on usage and redistribution
- * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- *
- * RCS: @(#) $Id: tkUnixKey.c,v 1.10 2002/06/17 20:09:01 hobbs Exp $
- */
- #include "tkInt.h"
- /*
- * Prototypes for local procedures defined in this file:
- */
- /*
- *----------------------------------------------------------------------
- *
- * Tk_SetCaretPos --
- *
- * This enables correct placement of the XIM caret. This is called
- * by widgets to indicate their cursor placement, and the caret
- * location is used by TkpGetString to place the XIM caret.
- * This is currently only used for over-the-spot XIM.
- *
- * Results:
- * None
- *
- * Side effects:
- * None
- *
- *----------------------------------------------------------------------
- */
- void
- Tk_SetCaretPos(tkwin, x, y, height)
- Tk_Window tkwin;
- int x;
- int y;
- int height;
- {
- TkCaret *caretPtr = &(((TkWindow *) tkwin)->dispPtr->caret);
- /*
- * Use height for best placement of the XIM over-the-spot box.
- */
- caretPtr->winPtr = ((TkWindow *) tkwin);
- caretPtr->x = x;
- caretPtr->y = y;
- caretPtr->height = height;
- }
- /*
- *----------------------------------------------------------------------
- *
- * TkpGetString --
- *
- * Retrieve the UTF string associated with a keyboard event.
- *
- * Results:
- * Returns the UTF string.
- *
- * Side effects:
- * Stores the input string in the specified Tcl_DString. Modifies
- * the internal input state. This routine can only be called
- * once for a given event.
- *
- *----------------------------------------------------------------------
- */
- char *
- TkpGetString(winPtr, eventPtr, dsPtr)
- TkWindow *winPtr; /* Window where event occurred: needed to
- * get input context. */
- XEvent *eventPtr; /* X keyboard event. */
- Tcl_DString *dsPtr; /* Uninitialized or empty string to hold
- * result. */
- {
- int len;
- Tcl_DString buf;
- Status status;
- #ifdef TK_USE_INPUT_METHODS
- TkDisplay *dispPtr = winPtr->dispPtr;
- #endif
- /*
- * Overallocate the dstring to the maximum stack amount.
- */
- Tcl_DStringInit(&buf);
- Tcl_DStringSetLength(&buf, TCL_DSTRING_STATIC_SIZE-1);
- #ifdef TK_USE_INPUT_METHODS
- if ((dispPtr->flags & TK_DISPLAY_USE_IM)
- && (winPtr->inputContext != NULL)
- && (eventPtr->type == KeyPress)) {
- #if TK_XIM_SPOT
- XVaNestedList preedit_attr;
- XPoint spot;
- #endif
- len = XmbLookupString(winPtr->inputContext, &eventPtr->xkey,
- Tcl_DStringValue(&buf), Tcl_DStringLength(&buf),
- (KeySym *) NULL, &status);
- /*
- * If the buffer wasn't big enough, grow the buffer and try again.
- */
- if (status == XBufferOverflow) {
- Tcl_DStringSetLength(&buf, len);
- len = XmbLookupString(winPtr->inputContext, &eventPtr->xkey,
- Tcl_DStringValue(&buf), len, (KeySym *) NULL, &status);
- }
- if ((status != XLookupChars) && (status != XLookupBoth)) {
- len = 0;
- }
- #if TK_XIM_SPOT
- /*
- * Adjust the XIM caret position. We might want to check that
- * this is the right caret.winPtr as well.
- */
- if (dispPtr->flags & TK_DISPLAY_XIM_SPOT) {
- spot.x = dispPtr->caret.x;
- spot.y = dispPtr->caret.y + dispPtr->caret.height;
- preedit_attr = XVaCreateNestedList(0, XNSpotLocation, &spot, NULL);
- XSetICValues(winPtr->inputContext,
- XNPreeditAttributes, preedit_attr, NULL);
- XFree(preedit_attr);
- }
- #endif
- } else {
- len = XLookupString(&eventPtr->xkey, Tcl_DStringValue(&buf),
- Tcl_DStringLength(&buf), (KeySym *) NULL,
- (XComposeStatus *) NULL);
- }
- #else /* TK_USE_INPUT_METHODS */
- len = XLookupString(&eventPtr->xkey, Tcl_DStringValue(&buf),
- Tcl_DStringLength(&buf), (KeySym *) NULL,
- (XComposeStatus *) NULL);
- #endif /* TK_USE_INPUT_METHODS */
- Tcl_DStringSetLength(&buf, len);
- Tcl_ExternalToUtfDString(NULL, Tcl_DStringValue(&buf), len, dsPtr);
- Tcl_DStringFree(&buf);
- return Tcl_DStringValue(dsPtr);
- }
- /*
- * When mapping from a keysym to a keycode, need
- * information about the modifier state that should be used
- * so that when they call XKeycodeToKeysym taking into
- * account the xkey.state, they will get back the original
- * keysym.
- */
- void
- TkpSetKeycodeAndState(tkwin, keySym, eventPtr)
- Tk_Window tkwin;
- KeySym keySym;
- XEvent *eventPtr;
- {
- Display *display;
- int state;
- KeyCode keycode;
-
- display = Tk_Display(tkwin);
-
- if (keySym == NoSymbol) {
- keycode = 0;
- } else {
- keycode = XKeysymToKeycode(display, keySym);
- }
- if (keycode != 0) {
- for (state = 0; state < 4; state++) {
- if (XKeycodeToKeysym(display, keycode, state) == keySym) {
- if (state & 1) {
- eventPtr->xkey.state |= ShiftMask;
- }
- if (state & 2) {
- TkDisplay *dispPtr;
- dispPtr = ((TkWindow *) tkwin)->dispPtr;
- eventPtr->xkey.state |= dispPtr->modeModMask;
- }
- break;
- }
- }
- }
- eventPtr->xkey.keycode = keycode;
- }
- /*
- *----------------------------------------------------------------------
- *
- * TkpGetKeySym --
- *
- * Given an X KeyPress or KeyRelease event, map the
- * keycode in the event into a KeySym.
- *
- * Results:
- * The return value is the KeySym corresponding to
- * eventPtr, or NoSymbol if no matching Keysym could be
- * found.
- *
- * Side effects:
- * In the first call for a given display, keycode-to-
- * KeySym maps get loaded.
- *
- *----------------------------------------------------------------------
- */
- KeySym
- TkpGetKeySym(dispPtr, eventPtr)
- TkDisplay *dispPtr; /* Display in which to
- * map keycode. */
- XEvent *eventPtr; /* Description of X event. */
- {
- KeySym sym;
- int index;
- /*
- * Refresh the mapping information if it's stale
- */
- if (dispPtr->bindInfoStale) {
- TkpInitKeymapInfo(dispPtr);
- }
- /*
- * Figure out which of the four slots in the keymap vector to
- * use for this key. Refer to Xlib documentation for more info
- * on how this computation works.
- */
- index = 0;
- if (eventPtr->xkey.state & dispPtr->modeModMask) {
- index = 2;
- }
- if ((eventPtr->xkey.state & ShiftMask)
- || ((dispPtr->lockUsage != LU_IGNORE)
- && (eventPtr->xkey.state & LockMask))) {
- index += 1;
- }
- sym = XKeycodeToKeysym(dispPtr->display, eventPtr->xkey.keycode, index);
- /*
- * Special handling: if the key was shifted because of Lock, but
- * lock is only caps lock, not shift lock, and the shifted keysym
- * isn't upper-case alphabetic, then switch back to the unshifted
- * keysym.
- */
- if ((index & 1) && !(eventPtr->xkey.state & ShiftMask)
- && (dispPtr->lockUsage == LU_CAPS)) {
- if (!(((sym >= XK_A) && (sym <= XK_Z))
- || ((sym >= XK_Agrave) && (sym <= XK_Odiaeresis))
- || ((sym >= XK_Ooblique) && (sym <= XK_Thorn)))) {
- index &= ~1;
- sym = XKeycodeToKeysym(dispPtr->display, eventPtr->xkey.keycode,
- index);
- }
- }
- /*
- * Another bit of special handling: if this is a shifted key and there
- * is no keysym defined, then use the keysym for the unshifted key.
- */
- if ((index & 1) && (sym == NoSymbol)) {
- sym = XKeycodeToKeysym(dispPtr->display, eventPtr->xkey.keycode,
- index & ~1);
- }
- return sym;
- }
- /*
- *--------------------------------------------------------------
- *
- * TkpInitKeymapInfo --
- *
- * This procedure is invoked to scan keymap information
- * to recompute stuff that's important for binding, such
- * as the modifier key (if any) that corresponds to "mode
- * switch".
- *
- * Results:
- * None.
- *
- * Side effects:
- * Keymap-related information in dispPtr is updated.
- *
- *--------------------------------------------------------------
- */
- void
- TkpInitKeymapInfo(dispPtr)
- TkDisplay *dispPtr; /* Display for which to recompute keymap
- * information. */
- {
- XModifierKeymap *modMapPtr;
- KeyCode *codePtr;
- KeySym keysym;
- int count, i, j, max, arraySize;
- #define KEYCODE_ARRAY_SIZE 20
- dispPtr->bindInfoStale = 0;
- modMapPtr = XGetModifierMapping(dispPtr->display);
- /*
- * Check the keycodes associated with the Lock modifier. If
- * any of them is associated with the XK_Shift_Lock modifier,
- * then Lock has to be interpreted as Shift Lock, not Caps Lock.
- */
- dispPtr->lockUsage = LU_IGNORE;
- codePtr = modMapPtr->modifiermap + modMapPtr->max_keypermod*LockMapIndex;
- for (count = modMapPtr->max_keypermod; count > 0; count--, codePtr++) {
- if (*codePtr == 0) {
- continue;
- }
- keysym = XKeycodeToKeysym(dispPtr->display, *codePtr, 0);
- if (keysym == XK_Shift_Lock) {
- dispPtr->lockUsage = LU_SHIFT;
- break;
- }
- if (keysym == XK_Caps_Lock) {
- dispPtr->lockUsage = LU_CAPS;
- break;
- }
- }
- /*
- * Look through the keycodes associated with modifiers to see if
- * the the "mode switch", "meta", or "alt" keysyms are associated
- * with any modifiers. If so, remember their modifier mask bits.
- */
- dispPtr->modeModMask = 0;
- dispPtr->metaModMask = 0;
- dispPtr->altModMask = 0;
- codePtr = modMapPtr->modifiermap;
- max = 8*modMapPtr->max_keypermod;
- for (i = 0; i < max; i++, codePtr++) {
- if (*codePtr == 0) {
- continue;
- }
- keysym = XKeycodeToKeysym(dispPtr->display, *codePtr, 0);
- if (keysym == XK_Mode_switch) {
- dispPtr->modeModMask |= ShiftMask << (i/modMapPtr->max_keypermod);
- }
- if ((keysym == XK_Meta_L) || (keysym == XK_Meta_R)) {
- dispPtr->metaModMask |= ShiftMask << (i/modMapPtr->max_keypermod);
- }
- if ((keysym == XK_Alt_L) || (keysym == XK_Alt_R)) {
- dispPtr->altModMask |= ShiftMask << (i/modMapPtr->max_keypermod);
- }
- }
- /*
- * Create an array of the keycodes for all modifier keys.
- */
- if (dispPtr->modKeyCodes != NULL) {
- ckfree((char *) dispPtr->modKeyCodes);
- }
- dispPtr->numModKeyCodes = 0;
- arraySize = KEYCODE_ARRAY_SIZE;
- dispPtr->modKeyCodes = (KeyCode *) ckalloc((unsigned)
- (KEYCODE_ARRAY_SIZE * sizeof(KeyCode)));
- for (i = 0, codePtr = modMapPtr->modifiermap; i < max; i++, codePtr++) {
- if (*codePtr == 0) {
- continue;
- }
- /*
- * Make sure that the keycode isn't already in the array.
- */
- for (j = 0; j < dispPtr->numModKeyCodes; j++) {
- if (dispPtr->modKeyCodes[j] == *codePtr) {
- goto nextModCode;
- }
- }
- if (dispPtr->numModKeyCodes >= arraySize) {
- KeyCode *new;
- /*
- * Ran out of space in the array; grow it.
- */
- arraySize *= 2;
- new = (KeyCode *) ckalloc((unsigned)
- (arraySize * sizeof(KeyCode)));
- memcpy((VOID *) new, (VOID *) dispPtr->modKeyCodes,
- (dispPtr->numModKeyCodes * sizeof(KeyCode)));
- ckfree((char *) dispPtr->modKeyCodes);
- dispPtr->modKeyCodes = new;
- }
- dispPtr->modKeyCodes[dispPtr->numModKeyCodes] = *codePtr;
- dispPtr->numModKeyCodes++;
- nextModCode: continue;
- }
- XFreeModifiermap(modMapPtr);
- }