tkpack.c

linux系统下的音频通信

	}
    }
    curExpand = cavityWidth/numExpand;
    if (curExpand < minExpand) {
	minExpand = curExpand;
    }
    return (minExpand < 0) ? 0 : minExpand;
}

/*
 *----------------------------------------------------------------------
 *
 * YExpansion --
 *
 *	Given a list of packed slaves, the first of which is packed
 *	on the top or bottom and is expandable, compute how much to
 *	expand the child.
 *
 * Results:
 *	The return value is the number of additional pixels to give to
 *	the child.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
YExpansion(slavePtr, cavityHeight)
    register Packer *slavePtr;		/* First in list of remaining
					 * slaves. */
    int cavityHeight;			/* Vertical space left for all
					 * remaining slaves. */
{
    int numExpand, minExpand, curExpand;
    int childHeight;

    /*
     * See comments for XExpansion.
     */

    minExpand = cavityHeight;
    numExpand = 0;
    for ( ; slavePtr != NULL; slavePtr = slavePtr->nextPtr) {
	childHeight = Tk_ReqHeight(slavePtr->tkwin) + slavePtr->doubleBw
		+ slavePtr->padY + slavePtr->iPadY;
	if ((slavePtr->side == LEFT) || (slavePtr->side == RIGHT)) {
	    curExpand = (cavityHeight - childHeight)/numExpand;
	    if (curExpand < minExpand) {
		minExpand = curExpand;
	    }
	} else {
	    cavityHeight -= childHeight;
	    if (slavePtr->flags & EXPAND) {
		numExpand++;
	    }
	}
    }
    curExpand = cavityHeight/numExpand;
    if (curExpand < minExpand) {
	minExpand = curExpand;
    }
    return (minExpand < 0) ? 0 : minExpand;
}

/*
 *--------------------------------------------------------------
 *
 * GetPacker --
 *
 *	This internal procedure is used to locate a Packer
 *	structure for a given window, creating one if one
 *	doesn't exist already.
 *
 * Results:
 *	The return value is a pointer to the Packer structure
 *	corresponding to tkwin.
 *
 * Side effects:
 *	A new packer structure may be created.  If so, then
 *	a callback is set up to clean things up when the
 *	window is deleted.
 *
 *--------------------------------------------------------------
 */

static Packer *
GetPacker(tkwin)
    Tk_Window tkwin;		/* Token for window for which
				 * packer structure is desired. */
{
    register Packer *packPtr;
    Tcl_HashEntry *hPtr;
    int new;

    if (!initialized) {
	initialized = 1;
	Tcl_InitHashTable(&packerHashTable, TCL_ONE_WORD_KEYS);
    }

    /*
     * See if there's already packer for this window.  If not,
     * then create a new one.
     */

    hPtr = Tcl_CreateHashEntry(&packerHashTable, (char *) tkwin, &new);
    if (!new) {
	return (Packer *) Tcl_GetHashValue(hPtr);
    }
    packPtr = (Packer *) ckalloc(sizeof(Packer));
    packPtr->tkwin = tkwin;
    packPtr->masterPtr = NULL;
    packPtr->nextPtr = NULL;
    packPtr->slavePtr = NULL;
    packPtr->side = TOP;
    packPtr->anchor = TK_ANCHOR_CENTER;
    packPtr->padX = packPtr->padY = 0;
    packPtr->iPadX = packPtr->iPadY = 0;
    packPtr->doubleBw = 2*Tk_Changes(tkwin)->border_width;
    packPtr->abortPtr = NULL;
    packPtr->flags = 0;
    Tcl_SetHashValue(hPtr, packPtr);
    Tk_CreateEventHandler(tkwin, StructureNotifyMask,
	    PackStructureProc, (ClientData) packPtr);
    return packPtr;
}

/*
 *--------------------------------------------------------------
 *
 * PackAfter --
 *
 *	This procedure does most of the real work of adding
 *	one or more windows into the packing order for its parent.
 *
 * Results:
 *	A standard Tcl return value.
 *
 * Side effects:
 *	The geometry of the specified windows may change, both now and
 *	again in the future.
 *
 *--------------------------------------------------------------
 */

static int
PackAfter(interp, prevPtr, masterPtr, argc, argv)
    Tcl_Interp *interp;		/* Interpreter for error reporting. */
    Packer *prevPtr;		/* Pack windows in argv just after this
				 * window;  NULL means pack as first
				 * child of masterPtr. */
    Packer *masterPtr;		/* Master in which to pack windows. */
    int argc;			/* Number of elements in argv. */
    char **argv;		/* Array of lists, each containing 2
				 * elements:  window name and side
				 * against which to pack. */
{
    register Packer *packPtr;
    Tk_Window tkwin, ancestor, parent;
    size_t length;
    char **options;
    int index, tmp, optionCount, c;

    /*
     * Iterate over all of the window specifiers, each consisting of
     * two arguments.  The first argument contains the window name and
     * the additional arguments contain options such as "top" or
     * "padx 20".
     */

    for ( ; argc > 0; argc -= 2, argv += 2, prevPtr = packPtr) {
	if (argc < 2) {
	    Tcl_AppendResult(interp, "wrong # args: window \"",
		    argv[0], "\" should be followed by options",
		    (char *) NULL);
	    return TCL_ERROR;
	}

	/*
	 * Find the packer for the window to be packed, and make sure
	 * that the window in which it will be packed is either its
	 * or a descendant of its parent.
	 */

	tkwin = Tk_NameToWindow(interp, argv[0], masterPtr->tkwin);
	if (tkwin == NULL) {
	    return TCL_ERROR;
	}

	parent = Tk_Parent(tkwin);
	for (ancestor = masterPtr->tkwin; ; ancestor = Tk_Parent(ancestor)) {
	    if (ancestor == parent) {
		break;
	    }
	    if (((Tk_FakeWin *) (ancestor))->flags & TK_TOP_LEVEL) {
		badWindow:
		Tcl_AppendResult(interp, "can't pack ", argv[0],
			" inside ", Tk_PathName(masterPtr->tkwin),
			(char *) NULL);
		return TCL_ERROR;
	    }
	}
	if (((Tk_FakeWin *) (tkwin))->flags & TK_TOP_LEVEL) {
	    goto badWindow;
	}
	if (tkwin == masterPtr->tkwin) {
	    goto badWindow;
	}
	packPtr = GetPacker(tkwin);

	/*
	 * Process options for this window.
	 */

	if (Tcl_SplitList(interp, argv[1], &optionCount, &options) != TCL_OK) {
	    return TCL_ERROR;
	}
	packPtr->side = TOP;
	packPtr->anchor = TK_ANCHOR_CENTER;
	packPtr->padX = packPtr->padY = 0;
	packPtr->iPadX = packPtr->iPadY = 0;
	packPtr->flags &= ~(FILLX|FILLY|EXPAND);
	packPtr->flags |= OLD_STYLE;
	for (index = 0 ; index < optionCount; index++) {
	    char *curOpt = options[index];

	    c = curOpt[0];
	    length = strlen(curOpt);

	    if ((c == 't')
		    && (strncmp(curOpt, "top", length)) == 0) {
		packPtr->side = TOP;
	    } else if ((c == 'b')
		    && (strncmp(curOpt, "bottom", length)) == 0) {
		packPtr->side = BOTTOM;
	    } else if ((c == 'l')
		    && (strncmp(curOpt, "left", length)) == 0) {
		packPtr->side = LEFT;
	    } else if ((c == 'r')
		    && (strncmp(curOpt, "right", length)) == 0) {
		packPtr->side = RIGHT;
	    } else if ((c == 'e')
		    && (strncmp(curOpt, "expand", length)) == 0) {
		packPtr->flags |= EXPAND;
	    } else if ((c == 'f')
		    && (strcmp(curOpt, "fill")) == 0) {
		packPtr->flags |= FILLX|FILLY;
	    } else if ((length == 5) && (strcmp(curOpt, "fillx")) == 0) {
		packPtr->flags |= FILLX;
	    } else if ((length == 5) && (strcmp(curOpt, "filly")) == 0) {
		packPtr->flags |= FILLY;
	    } else if ((c == 'p') && (strcmp(curOpt, "padx")) == 0) {
		if (optionCount < (index+2)) {
		    missingPad:
		    Tcl_AppendResult(interp, "wrong # args: \"", curOpt,
			    "\" option must be followed by screen distance",
			    (char *) NULL);
		    goto error;
		}
		if ((Tk_GetPixels(interp, tkwin, options[index+1], &tmp)
			!= TCL_OK) || (tmp < 0)) {
		    badPad:
		    Tcl_AppendResult(interp, "bad pad value \"",
			    options[index+1],
			    "\": must be positive screen distance",
			    (char *) NULL);
		    goto error;
		}
		packPtr->padX = tmp;
		packPtr->iPadX = 0;
		index++;
	    } else if ((c == 'p') && (strcmp(curOpt, "pady")) == 0) {
		if (optionCount < (index+2)) {
		    goto missingPad;
		}
		if ((Tk_GetPixels(interp, tkwin, options[index+1], &tmp)
			!= TCL_OK) || (tmp < 0)) {
		    goto badPad;
		}
		packPtr->padY = tmp;
		packPtr->iPadY = 0;
		index++;
	    } else if ((c == 'f') && (length > 1)
		    && (strncmp(curOpt, "frame", length) == 0)) {
		if (optionCount < (index+2)) {
		    Tcl_AppendResult(interp, "wrong # args: \"frame\" ",
			    "option must be followed by anchor point",
			    (char *) NULL);
		    goto error;
		}
		if (Tk_GetAnchor(interp, options[index+1],
			&packPtr->anchor) != TCL_OK) {
		    goto error;
		}
		index++;
	    } else {
		Tcl_AppendResult(interp, "bad option \"", curOpt,
			"\": should be top, bottom, left, right, ",
			"expand, fill, fillx, filly, padx, pady, or frame",
			(char *) NULL);
		goto error;
	    }
	}

	if (packPtr != prevPtr) {

	    /*
	     * Unpack this window if it's currently packed.
	     */

	    if (packPtr->masterPtr != NULL) {
		if ((packPtr->masterPtr != masterPtr) &&
			(packPtr->masterPtr->tkwin
			!= Tk_Parent(packPtr->tkwin))) {
		    Tk_UnmaintainGeometry(packPtr->tkwin,
			    packPtr->masterPtr->tkwin);
		}
		Unlink(packPtr);
	    }
	
	    /*
	     * Add the window in the correct place in its parent's
	     * packing order, then make sure that the window is
	     * managed by us.
	     */

	    packPtr->masterPtr = masterPtr;
	    if (prevPtr == NULL) {
		packPtr->nextPtr = masterPtr->slavePtr;
		masterPtr->slavePtr = packPtr;
	    } else {
		packPtr->nextPtr = prevPtr->nextPtr;
		prevPtr->nextPtr = packPtr;
	    }
	    Tk_ManageGeometry(tkwin, &packerType, (ClientData) packPtr);
	}
	ckfree((char *) options);
    }

    /*
     * Arrange for the parent to be re-packed at the first
     * idle moment.
     */

    if (masterPtr->abortPtr != NULL) {
	*masterPtr->abortPtr = 1;
    }
    if (!(masterPtr->flags & REQUESTED_REPACK)) {
	masterPtr->flags |= REQUESTED_REPACK;
	Tcl_DoWhenIdle(ArrangePacking, (ClientData) masterPtr);
    }
    return TCL_OK;

    error:
    ckfree((char *) options);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * Unlink --
 *
 *	Remove a packer from its parent's list of slaves.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The parent will be scheduled for repacking.
 *
 *----------------------------------------------------------------------
 */

static void
Unlink(packPtr)
    register Packer *packPtr;		/* Window to unlink. */
{
    register Packer *masterPtr, *packPtr2;

    masterPtr = packPtr->masterPtr;
    if (masterPtr == NULL) {
	return;
    }
    if (masterPtr->slavePtr == packPtr) {
	masterPtr->slavePtr = packPtr->nextPtr;
    } else {
	for (packPtr2 = masterPtr->slavePtr; ; packPtr2 = packPtr2->nextPtr) {
	    if (packPtr2 == NULL) {
		panic("Unlink couldn't find previous window");
	    }
	    if (packPtr2->nextPtr == packPtr) {
		packPtr2->nextPtr = packPtr->nextPtr;
		break;
	    }
	}
    }
    if (!(masterPtr->flags & REQUESTED_REPACK)) {
	masterPtr->flags |= REQUESTED_REPACK;
	Tcl_DoWhenIdle(ArrangePacking, (ClientData) masterPtr);
    }
    if (masterPtr->abortPtr != NULL) {
	*masterPtr->abortPtr = 1;
    }

    packPtr->masterPtr = NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * DestroyPacker --
 *
 *	This procedure is invoked by Tcl_EventuallyFree or Tcl_Release
 *	to clean up the internal structure of a packer at a safe time
 *	(when no-one is using it anymore).
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Everything associated with the packer is freed up.
 *
 *----------------------------------------------------------------------
 */

static void
DestroyPacker(memPtr)
    char *memPtr;		/* Info about packed window that
				 * is now dead. */
{