tktexttag.c

linux系统下的音频通信

    }
    if (tagPtr->spacing1String != NULL) {
	ckfree(tagPtr->spacing1String);
    }
    if (tagPtr->spacing2String != NULL) {
	ckfree(tagPtr->spacing2String);
    }
    if (tagPtr->spacing3String != NULL) {
	ckfree(tagPtr->spacing3String);
    }
    if (tagPtr->tabString != NULL) {
	ckfree(tagPtr->tabString);
    }
    if (tagPtr->tabArrayPtr != NULL) {
	ckfree((char *) tagPtr->tabArrayPtr);
    }
    if (tagPtr->underlineString != NULL) {
	ckfree(tagPtr->underlineString);
    }
    ckfree((char *) tagPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * SortTags --
 *
 *	This procedure sorts an array of tag pointers in increasing
 *	order of priority, optimizing for the common case where the
 *	array is small.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static void
SortTags(numTags, tagArrayPtr)
    int numTags;		/* Number of tag pointers at *tagArrayPtr. */
    TkTextTag **tagArrayPtr;	/* Pointer to array of pointers. */
{
    int i, j, prio;
    register TkTextTag **tagPtrPtr;
    TkTextTag **maxPtrPtr, *tmp;

    if (numTags < 2) {
	return;
    }
    if (numTags < 20) {
	for (i = numTags-1; i > 0; i--, tagArrayPtr++) {
	    maxPtrPtr = tagPtrPtr = tagArrayPtr;
	    prio = tagPtrPtr[0]->priority;
	    for (j = i, tagPtrPtr++; j > 0; j--, tagPtrPtr++) {
		if (tagPtrPtr[0]->priority < prio) {
		    prio = tagPtrPtr[0]->priority;
		    maxPtrPtr = tagPtrPtr;
		}
	    }
	    tmp = *maxPtrPtr;
	    *maxPtrPtr = *tagArrayPtr;
	    *tagArrayPtr = tmp;
	}
    } else {
	qsort((VOID *) tagArrayPtr, (unsigned) numTags, sizeof (TkTextTag *),
		    TagSortProc);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TagSortProc --
 *
 *	This procedure is called by qsort when sorting an array of
 *	tags in priority order.
 *
 * Results:
 *	The return value is -1 if the first argument should be before
 *	the second element (i.e. it has lower priority), 0 if it's
 *	equivalent (this should never happen!), and 1 if it should be
 *	after the second element.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
TagSortProc(first, second)
    CONST VOID *first, *second;		/* Elements to be compared. */
{
    TkTextTag *tagPtr1, *tagPtr2;

    tagPtr1 = * (TkTextTag **) first;
    tagPtr2 = * (TkTextTag **) second;
    return tagPtr1->priority - tagPtr2->priority;
}

/*
 *----------------------------------------------------------------------
 *
 * ChangeTagPriority --
 *
 *	This procedure changes the priority of a tag by modifying
 *	its priority and the priorities of other tags that are affected
 *	by the change.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Priorities may be changed for some or all of the tags in
 *	textPtr.  The tags will be arranged so that there is exactly
 *	one tag at each priority level between 0 and textPtr->numTags-1,
 *	with tagPtr at priority "prio".
 *
 *----------------------------------------------------------------------
 */

static void
ChangeTagPriority(textPtr, tagPtr, prio)
    TkText *textPtr;			/* Information about text widget. */
    TkTextTag *tagPtr;			/* Tag whose priority is to be
					 * changed. */
    int prio;				/* New priority for tag. */
{
    int low, high, delta;
    register TkTextTag *tagPtr2;
    Tcl_HashEntry *hPtr;
    Tcl_HashSearch search;

    if (prio < 0) {
	prio = 0;
    }
    if (prio >= textPtr->numTags) {
	prio = textPtr->numTags-1;
    }
    if (prio == tagPtr->priority) {
	return;
    } else if (prio < tagPtr->priority) {
	low = prio;
	high = tagPtr->priority-1;
	delta = 1;
    } else {
	low = tagPtr->priority+1;
	high = prio;
	delta = -1;
    }
    for (hPtr = Tcl_FirstHashEntry(&textPtr->tagTable, &search);
	    hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
	tagPtr2 = (TkTextTag *) Tcl_GetHashValue(hPtr);
	if ((tagPtr2->priority >= low) && (tagPtr2->priority <= high)) {
	    tagPtr2->priority += delta;
	}
    }
    tagPtr->priority = prio;
}

/*
 *--------------------------------------------------------------
 *
 * TkTextBindProc --
 *
 *	This procedure is invoked by the Tk dispatcher to handle
 *	events associated with bindings on items.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Depends on the command invoked as part of the binding
 *	(if there was any).
 *
 *--------------------------------------------------------------
 */

void
TkTextBindProc(clientData, eventPtr)
    ClientData clientData;		/* Pointer to canvas structure. */
    XEvent *eventPtr;			/* Pointer to X event that just
					 * happened. */
{
    TkText *textPtr = (TkText *) clientData;
    int repick  = 0;

# define AnyButtonMask (Button1Mask|Button2Mask|Button3Mask\
	|Button4Mask|Button5Mask)

    Tcl_Preserve((ClientData) textPtr);

    /*
     * This code simulates grabs for mouse buttons by keeping track
     * of whether a button is pressed and refusing to pick a new current
     * character while a button is pressed.
     */

    if (eventPtr->type == ButtonPress) {
	textPtr->flags |= BUTTON_DOWN;
    } else if (eventPtr->type == ButtonRelease) {
	int mask;

	switch (eventPtr->xbutton.button) {
	    case Button1:
		mask = Button1Mask;
		break;
	    case Button2:
		mask = Button2Mask;
		break;
	    case Button3:
		mask = Button3Mask;
		break;
	    case Button4:
		mask = Button4Mask;
		break;
	    case Button5:
		mask = Button5Mask;
		break;
	    default:
		mask = 0;
		break;
	}
	if ((eventPtr->xbutton.state & AnyButtonMask) == (unsigned) mask) {
	    textPtr->flags &= ~BUTTON_DOWN;
	    repick = 1;
	}
    } else if ((eventPtr->type == EnterNotify)
	    || (eventPtr->type == LeaveNotify)) {
	if (eventPtr->xcrossing.state & AnyButtonMask)  {
	    textPtr->flags |= BUTTON_DOWN;
	} else {
	    textPtr->flags &= ~BUTTON_DOWN;
	}
	TkTextPickCurrent(textPtr, eventPtr);
	goto done;
    } else if (eventPtr->type == MotionNotify) {
	if (eventPtr->xmotion.state & AnyButtonMask)  {
	    textPtr->flags |= BUTTON_DOWN;
	} else {
	    textPtr->flags &= ~BUTTON_DOWN;
	}
	TkTextPickCurrent(textPtr, eventPtr);
    }
    if ((textPtr->numCurTags > 0) && (textPtr->bindingTable != NULL)
	    && (textPtr->tkwin != NULL)) {
	Tk_BindEvent(textPtr->bindingTable, eventPtr, textPtr->tkwin,
		textPtr->numCurTags, (ClientData *) textPtr->curTagArrayPtr);
    }
    if (repick) {
	unsigned int oldState;

	oldState = eventPtr->xbutton.state;
	eventPtr->xbutton.state &= ~(Button1Mask|Button2Mask
		|Button3Mask|Button4Mask|Button5Mask);
	TkTextPickCurrent(textPtr, eventPtr);
	eventPtr->xbutton.state = oldState;
    }

    done:
    Tcl_Release((ClientData) textPtr);
}

/*
 *--------------------------------------------------------------
 *
 * TkTextPickCurrent --
 *
 *	Find the character containing the coordinates in an event
 *	and place the "current" mark on that character.  If the
 *	"current" mark has moved then generate a fake leave event
 *	on the old current character and a fake enter event on the new
 *	current character.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The current mark for textPtr may change.  If it does,
 *	then the commands associated with character entry and leave
 *	could do just about anything.  For example, the text widget
 *	might be deleted.  It is up to the caller to protect itself
 *	with calls to Tcl_Preserve and Tcl_Release.
 *
 *--------------------------------------------------------------
 */

void
TkTextPickCurrent(textPtr, eventPtr)
    register TkText *textPtr;		/* Text widget in which to select
					 * current character. */
    XEvent *eventPtr;			/* Event describing location of
					 * mouse cursor.  Must be EnterWindow,
					 * LeaveWindow, ButtonRelease, or
					 * MotionNotify. */
{
    TkTextIndex index;
    TkTextTag **oldArrayPtr, **newArrayPtr;
    TkTextTag **copyArrayPtr = NULL;	/* Initialization needed to prevent
					 * compiler warning. */

    int numOldTags, numNewTags, i, j, size;
    XEvent event;

    /*
     * If a button is down, then don't do anything at all;  we'll be
     * called again when all buttons are up, and we can repick then.
     * This implements a form of mouse grabbing.
     */

    if (textPtr->flags & BUTTON_DOWN) {
	if (((eventPtr->type == EnterNotify) || (eventPtr->type == LeaveNotify))
		&& ((eventPtr->xcrossing.mode == NotifyGrab)
		|| (eventPtr->xcrossing.mode == NotifyUngrab))) {
	    /*
	     * Special case:  the window is being entered or left because
	     * of a grab or ungrab.  In this case, repick after all.
	     * Furthermore, clear BUTTON_DOWN to release the simulated
	     * grab.
	     */

	    textPtr->flags &= ~BUTTON_DOWN;
	} else {
	    return;
	}
    }

    /*
     * Save information about this event in the widget in case we have
     * to synthesize more enter and leave events later (e.g. because a
     * character was deleted, causing a new character to be underneath
     * the mouse cursor).  Also translate MotionNotify events into
     * EnterNotify events, since that's what gets reported to event
     * handlers when the current character changes.
     */

    if (eventPtr != &textPtr->pickEvent) {
	if ((eventPtr->type == MotionNotify)
		|| (eventPtr->type == ButtonRelease)) {
	    textPtr->pickEvent.xcrossing.type = EnterNotify;
	    textPtr->pickEvent.xcrossing.serial = eventPtr->xmotion.serial;
	    textPtr->pickEvent.xcrossing.send_event
		    = eventPtr->xmotion.send_event;
	    textPtr->pickEvent.xcrossing.display = eventPtr->xmotion.display;
	    textPtr->pickEvent.xcrossing.window = eventPtr->xmotion.window;
	    textPtr->pickEvent.xcrossing.root = eventPtr->xmotion.root;
	    textPtr->pickEvent.xcrossing.subwindow = None;
	    textPtr->pickEvent.xcrossing.time = eventPtr->xmotion.time;
	    textPtr->pickEvent.xcrossing.x = eventPtr->xmotion.x;
	    textPtr->pickEvent.xcrossing.y = eventPtr->xmotion.y;
	    textPtr->pickEvent.xcrossing.x_root = eventPtr->xmotion.x_root;
	    textPtr->pickEvent.xcrossing.y_root = eventPtr->xmotion.y_root;
	    textPtr->pickEvent.xcrossing.mode = NotifyNormal;
	    textPtr->pickEvent.xcrossing.detail = NotifyNonlinear;
	    textPtr->pickEvent.xcrossing.same_screen
		    = eventPtr->xmotion.same_screen;
	    textPtr->pickEvent.xcrossing.focus = False;
	    textPtr->pickEvent.xcrossing.state = eventPtr->xmotion.state;
	} else  {
	    textPtr->pickEvent = *eventPtr;
	}
    }

    /*
     * Find the new current character, then find and sort all of the
     * tags associated with it.
     */

    if (textPtr->pickEvent.type != LeaveNotify) {
	TkTextPixelIndex(textPtr, textPtr->pickEvent.xcrossing.x,
		textPtr->pickEvent.xcrossing.y, &index);
	newArrayPtr = TkBTreeGetTags(&index, &numNewTags);
	SortTags(numNewTags, newArrayPtr);
    } else {
	newArrayPtr = NULL;
	numNewTags = 0;
    }

    /*
     * Resort the tags associated with the previous marked character
     * (the priorities might have changed), then make a copy of the
     * new tags, and compare the old tags to the copy, nullifying
     * any tags that are present in both groups (i.e. the tags that
     * haven't changed).
     */

    SortTags(textPtr->numCurTags, textPtr->curTagArrayPtr);
    if (numNewTags > 0) {
	size = numNewTags * sizeof(TkTextTag *);
	copyArrayPtr = (TkTextTag **) ckalloc((unsigned) size);
	memcpy((VOID *) copyArrayPtr, (VOID *) newArrayPtr, (size_t) size);
	for (i = 0; i < textPtr->numCurTags; i++) {
	    for (j = 0; j < numNewTags; j++) {
		if (textPtr->curTagArrayPtr[i] == copyArrayPtr[j]) {
		    textPtr->curTagArrayPtr[i] = NULL;
		    copyArrayPtr[j] = NULL;
		    break;
		}
	    }
	}
    }

    /*
     * Invoke the binding system with a LeaveNotify event for all of
     * the tags that have gone away.  We have to be careful here,
     * because it's possible that the binding could do something
     * (like calling tkwait) that eventually modifies
     * textPtr->curTagArrayPtr.  To avoid problems in situations like
     * this, update curTagArrayPtr to its new value before invoking
     * any bindings, and don't use it any more here.
     */

    numOldTags = textPtr->numCurTags;
    textPtr->numCurTags = numNewTags;
    oldArrayPtr = textPtr->curTagArrayPtr;
    textPtr->curTagArrayPtr = newArrayPtr;
    if (numOldTags != 0) {
	if ((textPtr->bindingTable != NULL) && (textPtr->tkwin != NULL)) {
	    event = textPtr->pickEvent;
	    event.type = LeaveNotify;

	    /*
	     * Always use a detail of NotifyAncestor.  Besides being
	     * consistent, this avoids problems where the binding code
	     * will discard NotifyInferior events.
	     */

	    event.xcrossing.detail = NotifyAncestor;
	    Tk_BindEvent(textPtr->bindingTable, &event, textPtr->tkwin,
		    numOldTags, (ClientData *) oldArrayPtr);
	}
	ckfree((char *) oldArrayPtr);
    }

    /*
     * Reset the "current" mark (be careful to recompute its location,
     * since it might have changed during an event binding).  Then
     * invoke the binding system with an EnterNotify event for all of
     * the tags that have just appeared.
     */

    TkTextPixelIndex(textPtr, textPtr->pickEvent.xcrossing.x,
	    textPtr->pickEvent.xcrossing.y, &index);
    TkTextSetMark(textPtr, "current", &index);
    if (numNewTags != 0) {
	if ((textPtr->bindingTable != NULL) && (textPtr->tkwin != NULL)) {
	    event = textPtr->pickEvent;
	    event.type = EnterNotify;
	    event.xcrossing.detail = NotifyAncestor;
	    Tk_BindEvent(textPtr->bindingTable, &event, textPtr->tkwin,
		    numNewTags, (ClientData *) copyArrayPtr);
	}
	ckfree((char *) copyArrayPtr);
    }
}