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ckListbox.c
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/*
* ckListbox.c --
*
* This module implements listbox widgets for the
* toolkit. A listbox displays a collection of strings,
* one per line, and provides scrolling and selection.
*
* Copyright (c) 1990-1994 The Regents of the University of California.
* Copyright (c) 1994-1995 Sun Microsystems, Inc.
* Copyright (c) 1995 Christian Werner
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include <stdio.h>
#include "ckPort.h"
#include "ck.h"
#include "default.h"
/*
* One record of the following type is kept for each element
* associated with a listbox widget:
*/
typedef struct Element {
int textLength; /* # non-NULL characters in text. */
int textWidth; /* Total width of element in screen
* characters. */
int selected; /* 1 means this item is selected, 0 means
* it isn't. */
struct Element *nextPtr; /* Next in list of all elements of this
* listbox, or NULL for last element. */
char text[4]; /* Characters of this element, NULL-
* terminated. The actual space allocated
* here will be as large as needed (> 4,
* most likely). Must be the last field
* of the record. */
} Element;
#define ElementSize(stringLength) \
(sizeof(Element) - 3 + stringLength)
/*
* A data structure of the following type is kept for each listbox
* widget managed by this file:
*/
typedef struct {
CkWindow *winPtr; /* Window that embodies the listbox. NULL
* means that the window has been destroyed
* but the data structures haven't yet been
* cleaned up.*/
Tcl_Interp *interp; /* Interpreter associated with listbox. */
Tcl_Command widgetCmd; /* Token for listbox's widget command. */
int numElements; /* Total number of elements in this listbox. */
Element *firstPtr; /* First in list of elements (NULL if no
* elements). */
Element *lastPtr; /* Last in list of elements (NULL if no
* elements). */
/*
* Information used when displaying widget:
*/
int normalBg; /* Normal background color. */
int normalFg; /* Normal foreground color. */
int normalAttr; /* Normal video attributes. */
int selBg; /* Select background color. */
int selFg; /* Select foreground color. */
int selAttr; /* Select video attributes. */
int activeBg; /* Active background color. */
int activeFg; /* Active foreground color. */
int activeAttr; /* Video attribute for active item. */
int width; /* Desired width of window, in characters. */
int height; /* Desired height of window, in lines. */
int topIndex; /* Index of top-most element visible in
* window. */
int fullLines; /* Number of lines that fit are completely
* visible in window. There may be one
* additional line at the bottom that is
* partially visible. */
/*
* Information to support horizontal scrolling:
*/
int maxWidth; /* Width of widest string in listbox. */
int xOffset; /* The left edge of each string in the
* listbox is offset to the left by this
* many chars (0 means no offset, positive
* means there is an offset). */
/*
* Information about what's selected or active, if any.
*/
Ck_Uid selectMode; /* Selection style: single, browse, multiple,
* or extended. This value isn't used in C
* code, but the Tcl bindings use it. */
int numSelected; /* Number of elements currently selected. */
int selectAnchor; /* Fixed end of selection (i.e. element
* at which selection was started.) */
int active; /* Index of "active" element (the one that
* has been selected by keyboard traversal).
* -1 means none. */
/*
* Miscellaneous information:
*/
char *takeFocus; /* Value of -takefocus option; not used in
* the C code, but used by keyboard traversal
* scripts. Malloc'ed, but may be NULL. */
char *yScrollCmd; /* Command prefix for communicating with
* vertical scrollbar. NULL means no command
* to issue. Malloc'ed. */
char *xScrollCmd; /* Command prefix for communicating with
* horizontal scrollbar. NULL means no command
* to issue. Malloc'ed. */
int flags; /* Various flag bits: see below for
* definitions. */
} Listbox;
/*
* Flag bits for listboxes:
*
* REDRAW_PENDING: Non-zero means a DoWhenIdle handler
* has already been queued to redraw
* this window.
* UPDATE_V_SCROLLBAR: Non-zero means vertical scrollbar needs
* to be updated.
* UPDATE_H_SCROLLBAR: Non-zero means horizontal scrollbar needs
* to be updated.
* GOT_FOCUS: Non-zero means this widget currently
* has the input focus.
*/
#define REDRAW_PENDING 1
#define UPDATE_V_SCROLLBAR 2
#define UPDATE_H_SCROLLBAR 4
#define GOT_FOCUS 8
/*
* Information used for argv parsing:
*/
static Ck_ConfigSpec configSpecs[] = {
{CK_CONFIG_ATTR, "-activeattributes", "activeAttributes",
"ActiveAttributes", DEF_LISTBOX_ACTIVE_ATTR_COLOR,
Ck_Offset(Listbox, activeAttr), CK_CONFIG_COLOR_ONLY},
{CK_CONFIG_ATTR, "-activeattributes", "activeAttributes",
"ActiveAttributes", DEF_LISTBOX_ACTIVE_ATTR_MONO,
Ck_Offset(Listbox, activeAttr), CK_CONFIG_MONO_ONLY},
{CK_CONFIG_COLOR, "-activebackground", "activeBackground", "Foreground",
DEF_LISTBOX_ACTIVE_BG_COLOR, Ck_Offset(Listbox, activeBg),
CK_CONFIG_COLOR_ONLY},
{CK_CONFIG_COLOR, "-activebackground", "activeBackground", "Foreground",
DEF_LISTBOX_ACTIVE_BG_MONO, Ck_Offset(Listbox, activeBg),
CK_CONFIG_MONO_ONLY},
{CK_CONFIG_COLOR, "-activeforeground", "activeForeground", "Background",
DEF_LISTBOX_ACTIVE_FG_COLOR, Ck_Offset(Listbox, activeFg),
CK_CONFIG_COLOR_ONLY},
{CK_CONFIG_COLOR, "-activeforeground", "activeForeground", "Background",
DEF_LISTBOX_ACTIVE_FG_MONO, Ck_Offset(Listbox, activeFg),
CK_CONFIG_MONO_ONLY},
{CK_CONFIG_ATTR, "-attributes", "attributes", "Attributes",
DEF_LISTBOX_ATTR, Ck_Offset(Listbox, normalAttr), 0},
{CK_CONFIG_COLOR, "-background", "background", "Background",
DEF_LISTBOX_BG_COLOR, Ck_Offset(Listbox, normalBg),
CK_CONFIG_COLOR_ONLY},
{CK_CONFIG_COLOR, "-background", "background", "Background",
DEF_LISTBOX_BG_MONO, Ck_Offset(Listbox, normalBg),
CK_CONFIG_MONO_ONLY},
{CK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL,
(char *) NULL, 0, 0},
{CK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL,
(char *) NULL, 0, 0},
{CK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
(char *) NULL, 0, 0},
{CK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
DEF_LISTBOX_FG, Ck_Offset(Listbox, normalFg), 0},
{CK_CONFIG_INT, "-height", "height", "Height",
DEF_LISTBOX_HEIGHT, Ck_Offset(Listbox, height), 0},
{CK_CONFIG_ATTR, "-selectattributes", "selectAttributes",
"SelectAttributes", DEF_LISTBOX_SELECT_ATTR_COLOR,
Ck_Offset(Listbox, selAttr), CK_CONFIG_COLOR_ONLY},
{CK_CONFIG_ATTR, "-selectattributes", "selectAttributes",
"SelectAttributes", DEF_LISTBOX_SELECT_ATTR_MONO,
Ck_Offset(Listbox, selAttr), CK_CONFIG_MONO_ONLY},
{CK_CONFIG_COLOR, "-selectbackground", "selectBackground", "Foreground",
DEF_LISTBOX_SELECT_BG_COLOR, Ck_Offset(Listbox, selBg),
CK_CONFIG_COLOR_ONLY},
{CK_CONFIG_COLOR, "-selectbackground", "selectBackground", "Foreground",
DEF_LISTBOX_SELECT_BG_MONO, Ck_Offset(Listbox, selBg),
CK_CONFIG_MONO_ONLY},
{CK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
DEF_LISTBOX_SELECT_FG_COLOR, Ck_Offset(Listbox, selFg),
CK_CONFIG_COLOR_ONLY},
{CK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
DEF_LISTBOX_SELECT_FG_MONO, Ck_Offset(Listbox, selFg),
CK_CONFIG_MONO_ONLY},
{CK_CONFIG_UID, "-selectmode", "selectMode", "SelectMode",
DEF_LISTBOX_SELECT_MODE, Ck_Offset(Listbox, selectMode), 0},
{CK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
DEF_LISTBOX_TAKE_FOCUS, Ck_Offset(Listbox, takeFocus),
CK_CONFIG_NULL_OK},
{CK_CONFIG_INT, "-width", "width", "Width",
DEF_LISTBOX_WIDTH, Ck_Offset(Listbox, width), 0},
{CK_CONFIG_STRING, "-xscrollcommand", "xScrollCommand", "ScrollCommand",
DEF_LISTBOX_SCROLL_COMMAND, Ck_Offset(Listbox, xScrollCmd),
CK_CONFIG_NULL_OK},
{CK_CONFIG_STRING, "-yscrollcommand", "yScrollCommand", "ScrollCommand",
DEF_LISTBOX_SCROLL_COMMAND, Ck_Offset(Listbox, yScrollCmd),
CK_CONFIG_NULL_OK},
{CK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
(char *) NULL, 0, 0}
};
/*
* Forward declarations for procedures defined later in this file:
*/
static void ChangeListboxOffset _ANSI_ARGS_((Listbox *listPtr,
int offset));
static void ChangeListboxView _ANSI_ARGS_((Listbox *listPtr,
int index));
static int ConfigureListbox _ANSI_ARGS_((Tcl_Interp *interp,
Listbox *listPtr, int argc, char **argv,
int flags));
static void DeleteEls _ANSI_ARGS_((Listbox *listPtr, int first,
int last));
static void DestroyListbox _ANSI_ARGS_((ClientData clientData));
static void DisplayListbox _ANSI_ARGS_((ClientData clientData));
static int GetListboxIndex _ANSI_ARGS_((Tcl_Interp *interp,
Listbox *listPtr, char *string, int numElsOK,
int *indexPtr));
static void InsertEls _ANSI_ARGS_((Listbox *listPtr, int index,
int argc, char **argv));
static void ListboxCmdDeletedProc _ANSI_ARGS_((
ClientData clientData));
static void ListboxComputeGeometry _ANSI_ARGS_((Listbox *listPtr));
static void ListboxEventProc _ANSI_ARGS_((ClientData clientData,
CkEvent *eventPtr));
static void ListboxRedrawRange _ANSI_ARGS_((Listbox *listPtr,
int first, int last));
static void ListboxSelect _ANSI_ARGS_((Listbox *listPtr,
int first, int last, int select));
static void ListboxUpdateHScrollbar _ANSI_ARGS_((Listbox *listPtr));
static void ListboxUpdateVScrollbar _ANSI_ARGS_((Listbox *listPtr));
static int ListboxWidgetCmd _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, int argc, char **argv));
static int NearestListboxElement _ANSI_ARGS_((Listbox *listPtr,
int y));
/*
*--------------------------------------------------------------
*
* Ck_ListboxCmd --
*
* This procedure is invoked to process the "listbox" Tcl
* command. See the user documentation for details on what
* it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
int
Ck_ListboxCmd(clientData, interp, argc, argv)
ClientData clientData; /* Main window associated with
* interpreter. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
register Listbox *listPtr;
CkWindow *new;
CkWindow *mainPtr = (CkWindow *) clientData;
if (argc < 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " pathName ?options?\"", (char *) NULL);
return TCL_ERROR;
}
new = Ck_CreateWindowFromPath(interp, mainPtr, argv[1], 0);
if (new == NULL) {
return TCL_ERROR;
}
/*
* Initialize the fields of the structure that won't be initialized
* by ConfigureListbox, or that ConfigureListbox requires to be
* initialized already (e.g. resource pointers).
*/
listPtr = (Listbox *) ckalloc(sizeof(Listbox));
listPtr->winPtr = new;
listPtr->interp = interp;
listPtr->widgetCmd = Tcl_CreateCommand(interp, listPtr->winPtr->pathName,
ListboxWidgetCmd, (ClientData) listPtr, ListboxCmdDeletedProc);
listPtr->numElements = 0;
listPtr->firstPtr = NULL;
listPtr->lastPtr = NULL;
listPtr->normalBg = 0;
listPtr->normalFg = 0;
listPtr->normalAttr = 0;
listPtr->selBg = 0;
listPtr->selFg = 0;
listPtr->selAttr = 0;
listPtr->activeBg = 0;
listPtr->activeFg = 0;
listPtr->activeAttr = 0;
listPtr->width = 0;
listPtr->height = 0;
listPtr->topIndex = 0;
listPtr->fullLines = 1;
listPtr->maxWidth = 0;
listPtr->xOffset = 0;
listPtr->selectMode = NULL;
listPtr->numSelected = 0;
listPtr->selectAnchor = 0;
listPtr->active = 0;
listPtr->takeFocus = NULL;
listPtr->xScrollCmd = NULL;
listPtr->yScrollCmd = NULL;
listPtr->flags = 0;
Ck_SetClass(listPtr->winPtr, "Listbox");
Ck_CreateEventHandler(listPtr->winPtr,
CK_EV_EXPOSE | CK_EV_MAP | CK_EV_DESTROY |
CK_EV_FOCUSIN | CK_EV_FOCUSOUT,
ListboxEventProc, (ClientData) listPtr);
if (ConfigureListbox(interp, listPtr, argc-2, argv+2, 0) != TCL_OK) {
goto error;
}
Tcl_SetResult(interp, listPtr->winPtr->pathName, TCL_VOLATILE);
return TCL_OK;
error:
Ck_DestroyWindow(listPtr->winPtr);
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* ListboxWidgetCmd --
*
* This procedure is invoked to process the Tcl command
* that corresponds to a widget managed by this module.
* See the user documentation for details on what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
static int
ListboxWidgetCmd(clientData, interp, argc, argv)
ClientData clientData; /* Information about listbox widget. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
register Listbox *listPtr = (Listbox *) clientData;
int result = TCL_OK;
size_t length;
int c;
char resultbuf[TCL_RESULT_SIZE];
if (argc < 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " option ?arg arg ...?\"", (char *) NULL);
return TCL_ERROR;
}
Ck_Preserve((ClientData) listPtr);
c = argv[1][0];
length = strlen(argv[1]);
if ((c == 'a') && (strncmp(argv[1], "activate", length) == 0)) {
int index;
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " activate index\"",
(char *) NULL);
goto error;
}
ListboxRedrawRange(listPtr, listPtr->active, listPtr->active);
if (GetListboxIndex(interp, listPtr, argv[2], 0, &index)
!= TCL_OK) {
goto error;
}
listPtr->active = index;
ListboxRedrawRange(listPtr, listPtr->active, listPtr->active);
} else if ((c == 'c') && (strncmp(argv[1], "cget", length) == 0)
&& (length >= 2)) {
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " cget option\"",
(char *) NULL);
goto error;
}
result = Ck_ConfigureValue(interp, listPtr->winPtr, configSpecs,
(char *) listPtr, argv[2], 0);
} else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)
&& (length >= 2)) {
if (argc == 2) {
result = Ck_ConfigureInfo(interp, listPtr->winPtr, configSpecs,
(char *) listPtr, (char *) NULL, 0);
} else if (argc == 3) {
result = Ck_ConfigureInfo(interp, listPtr->winPtr, configSpecs,
(char *) listPtr, argv[2], 0);
} else {
result = ConfigureListbox(interp, listPtr, argc-2, argv+2,
CK_CONFIG_ARGV_ONLY);
}
} else if ((c == 'c') && (strncmp(argv[1], "curselection", length) == 0)
&& (length >= 2)) {
int i, count;
char index[20];
Element *elPtr;
if (argc != 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " curselection\"",
(char *) NULL);
goto error;
}
count = 0;
for (i = 0, elPtr = listPtr->firstPtr; elPtr != NULL;
i++, elPtr = elPtr->nextPtr) {
if (elPtr->selected) {
sprintf(index, "%d", i);
Tcl_AppendElement(interp, index);
count++;
}
}
if (count != listPtr->numSelected) {
panic("ListboxWidgetCmd: selection count incorrect");
}
} else if ((c == 'd') && (strncmp(argv[1], "delete", length) == 0)) {
int first, last;
if ((argc < 3) || (argc > 4)) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " delete firstIndex ?lastIndex?\"",
(char *) NULL);
goto error;
}
if (GetListboxIndex(interp, listPtr, argv[2], 0, &first) != TCL_OK) {
goto error;
}
if (argc == 3) {
last = first;
} else {
if (GetListboxIndex(interp, listPtr, argv[3], 0, &last) != TCL_OK) {
goto error;
}
}
DeleteEls(listPtr, first, last);
} else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) {
int first, last, i;
Element *elPtr;
if ((argc != 3) && (argc != 4)) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " get first ?last?\"", (char *) NULL);
goto error;
}
if (GetListboxIndex(interp, listPtr, argv[2], 0, &first) != TCL_OK) {
goto error;
}
if ((argc == 4) && (GetListboxIndex(interp, listPtr, argv[3],
0, &last) != TCL_OK)) {
goto error;
}
for (elPtr = listPtr->firstPtr, i = 0; i < first;
i++, elPtr = elPtr->nextPtr) {
/* Empty loop body. */
}
if (elPtr != NULL) {
if (argc == 3) {
Tcl_SetResult(interp, elPtr->text, TCL_VOLATILE);
} else {
for ( ; i <= last; i++, elPtr = elPtr->nextPtr) {
Tcl_AppendElement(interp, elPtr->text);
}
}
}
} else if ((c == 'i') && (strncmp(argv[1], "index", length) == 0)
&& (length >= 3)) {
int index;
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " index index\"",
(char *) NULL);
goto error;
}
if (GetListboxIndex(interp, listPtr, argv[2], 1, &index)
!= TCL_OK) {
goto error;
}
snprintf(resultbuf, sizeof(resultbuf), "%d", index);
Tcl_SetResult(interp, resultbuf, TCL_VOLATILE);
} else if ((c == 'i') && (strncmp(argv[1], "insert", length) == 0)
&& (length >= 3)) {
int index;
if (argc < 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " insert index ?element element ...?\"",
(char *) NULL);
goto error;
}
if (GetListboxIndex(interp, listPtr, argv[2], 1, &index)
!= TCL_OK) {
goto error;
}
InsertEls(listPtr, index, argc-3, argv+3);
} else if ((c == 'n') && (strncmp(argv[1], "nearest", length) == 0)) {
int index, y;
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " nearest y\"", (char *) NULL);
goto error;
}
if (Tcl_GetInt(interp, argv[2], &y) != TCL_OK) {
goto error;
}
index = NearestListboxElement(listPtr, y);
snprintf(resultbuf, sizeof(resultbuf), "%d", index);
Tcl_SetResult(interp, resultbuf, TCL_VOLATILE);
} else if ((c == 's') && (strncmp(argv[1], "see", length) == 0)
&& (length >= 3)) {
int index, diff;
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " see index\"",
(char *) NULL);
goto error;
}
if (GetListboxIndex(interp, listPtr, argv[2], 0, &index) != TCL_OK) {
goto error;
}
diff = listPtr->topIndex-index;
if (diff > 0) {
if (diff <= (listPtr->fullLines/3)) {
ChangeListboxView(listPtr, index);
} else {
ChangeListboxView(listPtr, index - (listPtr->fullLines-1)/2);
}
} else {
diff = index - (listPtr->topIndex + listPtr->fullLines - 1);
if (diff > 0) {
if (diff <= (listPtr->fullLines/3)) {
ChangeListboxView(listPtr, listPtr->topIndex + diff);
} else {
ChangeListboxView(listPtr,
index - (listPtr->fullLines-1)/2);
}
}
}
} else if ((c == 's') && (length >= 3)
&& (strncmp(argv[1], "selection", length) == 0)) {
int first, last;
if ((argc != 4) && (argc != 5)) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " selection option index ?index?\"",
(char *) NULL);
goto error;
}
if (GetListboxIndex(interp, listPtr, argv[3], 0, &first) != TCL_OK) {
goto error;
}
if (argc == 5) {
if (GetListboxIndex(interp, listPtr, argv[4], 0, &last) != TCL_OK) {
goto error;
}
} else {
last = first;
}
length = strlen(argv[2]);
c = argv[2][0];
if ((c == 'a') && (strncmp(argv[2], "anchor", length) == 0)) {
if (argc != 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " selection anchor index\"", (char *) NULL);
goto error;
}
listPtr->selectAnchor = first;
} else if ((c == 'c') && (strncmp(argv[2], "clear", length) == 0)) {
ListboxSelect(listPtr, first, last, 0);
} else if ((c == 'i') && (strncmp(argv[2], "includes", length) == 0)) {
int i;
Element *elPtr;
if (argc != 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " selection includes index\"", (char *) NULL);
goto error;
}
for (elPtr = listPtr->firstPtr, i = 0; i < first;
i++, elPtr = elPtr->nextPtr) {
/* Empty loop body. */
}
if ((elPtr != NULL) && (elPtr->selected)) {
Tcl_SetResult(interp, "1", TCL_STATIC);
} else {
Tcl_SetResult(interp, "0", TCL_STATIC);
}
} else if ((c == 's') && (strncmp(argv[2], "set", length) == 0)) {
ListboxSelect(listPtr, first, last, 1);
} else {
Tcl_AppendResult(interp, "bad selection option \"", argv[2],
"\": must be anchor, clear, includes, or set",
(char *) NULL);
goto error;
}
} else if ((c == 's') && (length >= 2)
&& (strncmp(argv[1], "size", length) == 0)) {
if (argc != 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " size\"", (char *) NULL);
goto error;
}
snprintf(resultbuf, sizeof(resultbuf), "%d", listPtr->numElements);
Tcl_SetResult(interp, resultbuf, TCL_VOLATILE);
} else if ((c == 'x') && (strncmp(argv[1], "xview", length) == 0)) {
int index, count, type, windowWidth;
int offset = 0; /* Initialized to stop gcc warnings. */
double fraction, fraction2;
windowWidth = listPtr->winPtr->width;
if (argc == 2) {
if (listPtr->maxWidth == 0) {
Tcl_SetResult(interp, "0 1", TCL_STATIC);
} else {
fraction = listPtr->xOffset/((double) listPtr->maxWidth);
fraction2 = (listPtr->xOffset + windowWidth)
/((double) listPtr->maxWidth);
if (fraction2 > 1.0) {
fraction2 = 1.0;
}
snprintf(resultbuf, sizeof(resultbuf), "%g %g", fraction, fraction2);
Tcl_SetResult(interp, resultbuf, TCL_VOLATILE);
}
} else if (argc == 3) {
if (Tcl_GetInt(interp, argv[2], &index) != TCL_OK) {
goto error;
}
ChangeListboxOffset(listPtr, index);
} else {
type = Ck_GetScrollInfo(interp, argc, argv, &fraction, &count);
switch (type) {
case CK_SCROLL_ERROR:
goto error;
case CK_SCROLL_MOVETO:
offset = (int) fraction*listPtr->maxWidth;
break;
case CK_SCROLL_PAGES:
offset = listPtr->xOffset + count * windowWidth;
break;
case CK_SCROLL_UNITS:
offset = listPtr->xOffset + count;
break;
}
ChangeListboxOffset(listPtr, offset);
}
} else if ((c == 'y') && (strncmp(argv[1], "yview", length) == 0)) {
int index, count, type;
double fraction, fraction2;
if (argc == 2) {
if (listPtr->numElements == 0) {
Tcl_SetResult(interp, "0 1", TCL_STATIC);
} else {
fraction = listPtr->topIndex/((double) listPtr->numElements);
fraction2 = (listPtr->topIndex+listPtr->fullLines)
/((double) listPtr->numElements);
if (fraction2 > 1.0) {
fraction2 = 1.0;
}
snprintf(resultbuf, sizeof(resultbuf), "%g %g", fraction, fraction2);
Tcl_SetResult(interp, resultbuf, TCL_VOLATILE);
}
} else if (argc == 3) {
if (GetListboxIndex(interp, listPtr, argv[2], 0, &index)
!= TCL_OK) {
goto error;
}
ChangeListboxView(listPtr, index);
} else {
type = Ck_GetScrollInfo(interp, argc, argv, &fraction, &count);
switch (type) {
case CK_SCROLL_ERROR:
goto error;
case CK_SCROLL_MOVETO:
index = (int) (listPtr->numElements * fraction);
break;
case CK_SCROLL_PAGES:
if (listPtr->fullLines > 2) {
index = listPtr->topIndex
+ count * (listPtr->fullLines - 2);
} else {
index = listPtr->topIndex + count;
}
break;
case CK_SCROLL_UNITS:
index = listPtr->topIndex + count;
break;
}
ChangeListboxView(listPtr, index);
}
} else {
Tcl_AppendResult(interp, "bad option \"", argv[1],
"\": must be activate, cget, configure, ",
"curselection, delete, get, index, insert, nearest, ",
"see, selection, size, ",
"xview, or yview", (char *) NULL);
goto error;
}
Ck_Release((ClientData) listPtr);
return result;
error:
Ck_Release((ClientData) listPtr);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* DestroyListbox --
*
* This procedure is invoked by Ck_EventuallyFree or Ck_Release
* to clean up the internal structure of a listbox at a safe time
* (when no-one is using it anymore).
*
* Results:
* None.
*
* Side effects:
* Everything associated with the listbox is freed up.
*
*----------------------------------------------------------------------
*/
static void
DestroyListbox(clientData)
ClientData clientData; /* Info about listbox widget. */
{
register Listbox *listPtr = (Listbox *) clientData;
register Element *elPtr, *nextPtr;
/*
* Free up all of the list elements.
*/
for (elPtr = listPtr->firstPtr; elPtr != NULL; ) {
nextPtr = elPtr->nextPtr;
ckfree((char *) elPtr);
elPtr = nextPtr;
}
Ck_FreeOptions(configSpecs, (char *) listPtr, 0);
ckfree((char *) listPtr);
}
/*
*----------------------------------------------------------------------
*
* ListboxCmdDeletedProc --
*
* This procedure is invoked when a widget command is deleted. If
* the widget isn't already in the process of being destroyed,
* this command destroys it.
*
* Results:
* None.
*
* Side effects:
* The widget is destroyed.
*
*----------------------------------------------------------------------
*/
static void
ListboxCmdDeletedProc(clientData)
ClientData clientData; /* Pointer to widget record for widget. */
{
Listbox *listPtr = (Listbox *) clientData;
CkWindow *winPtr = listPtr->winPtr;
/*
* This procedure could be invoked either because the window was
* destroyed and the command was then deleted (in which case winPtr
* is NULL) or because the command was deleted, and then this procedure
* destroys the widget.
*/
if (winPtr != NULL) {
listPtr->winPtr = NULL;
Ck_DestroyWindow(winPtr);
}
}
/*
*----------------------------------------------------------------------
*
* ConfigureListbox --
*
* This procedure is called to process an argv/argc list, plus
* the option database, in order to configure (or reconfigure)
* a listbox widget.
*
* Results:
* The return value is a standard Tcl result. If TCL_ERROR is
* returned, then interp->result contains an error message.
*
* Side effects:
* Configuration information, such as colors, border width,
* etc. get set for listPtr; old resources get freed,
* if there were any.
*
*----------------------------------------------------------------------
*/
static int
ConfigureListbox(interp, listPtr, argc, argv, flags)
Tcl_Interp *interp; /* Used for error reporting. */
register Listbox *listPtr; /* Information about widget; may or may
* not already have values for some fields. */
int argc; /* Number of valid entries in argv. */
char **argv; /* Arguments. */
int flags; /* Flags to pass to Ck_ConfigureWidget. */
{
if (Ck_ConfigureWidget(interp, listPtr->winPtr, configSpecs,
argc, argv, (char *) listPtr, flags) != TCL_OK) {
return TCL_ERROR;
}
/*
* Register the desired geometry for the window and arrange for
* the window to be redisplayed.
*/
ListboxComputeGeometry(listPtr);
listPtr->flags |= UPDATE_V_SCROLLBAR|UPDATE_H_SCROLLBAR;
ListboxRedrawRange(listPtr, 0, listPtr->numElements-1);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* DisplayListbox --
*
* This procedure redraws the contents of a listbox window.
*
* Results:
* None.
*
* Side effects:
* Information appears on the screen.
*
*--------------------------------------------------------------
*/
static void
DisplayListbox(clientData)
ClientData clientData; /* Information about window. */
{
Listbox *listPtr = (Listbox *) clientData;
CkWindow *winPtr = listPtr->winPtr;
Element *elPtr;
int i, limit, y, width, cursorY;
listPtr->flags &= ~REDRAW_PENDING;
if (listPtr->flags & UPDATE_V_SCROLLBAR) {
ListboxUpdateVScrollbar(listPtr);
}
if (listPtr->flags & UPDATE_H_SCROLLBAR) {
ListboxUpdateHScrollbar(listPtr);
}
listPtr->flags &= ~(REDRAW_PENDING|UPDATE_V_SCROLLBAR|UPDATE_H_SCROLLBAR);
if ((listPtr->winPtr == NULL) || !(winPtr->flags & CK_MAPPED)) {
return;
}
Ck_SetWindowAttr(winPtr, listPtr->normalFg, listPtr->normalBg,
listPtr->normalAttr);
Ck_ClearToBot(winPtr, 0, 0);
/*
* Iterate through all of the elements of the listbox, displaying each
* in turn. Selected elements use a different fg/bg/attr.
*/
limit = listPtr->topIndex + listPtr->fullLines;
if (limit > listPtr->numElements) {
limit = listPtr->numElements;
}
width = listPtr->xOffset + winPtr->width;
for (elPtr = listPtr->firstPtr, i = 0, y = cursorY = 0;
(elPtr != NULL) && (i < limit);
elPtr = elPtr->nextPtr, i++) {
if (i < listPtr->topIndex) {
continue;
}
if (i == listPtr->active && (listPtr->flags & GOT_FOCUS)) {
cursorY = y;
Ck_SetWindowAttr(winPtr, listPtr->activeFg, listPtr->activeBg,
listPtr->activeAttr |
(elPtr->selected ? listPtr->selAttr : 0));
} else if (elPtr->selected) {
Ck_SetWindowAttr(winPtr, listPtr->selFg, listPtr->selBg,
listPtr->selAttr);
} else {
Ck_SetWindowAttr(winPtr, listPtr->normalFg, listPtr->normalBg,
listPtr->normalAttr);
}
#if CK_USE_UTF
if (listPtr->xOffset < elPtr->textWidth) {
char *p = Tcl_UtfAtIndex(elPtr->text, listPtr->xOffset);
CkDisplayChars(winPtr->mainPtr, winPtr->window, p,
strlen(p), 0, y, 0,
CK_NEWLINES_NOT_SPECIAL | CK_IGNORE_TABS | CK_FILL_UNTIL_EOL);
}
#else
CkDisplayChars(winPtr->mainPtr,
winPtr->window, &elPtr->text[listPtr->xOffset],
elPtr->textLength - listPtr->xOffset, 0, y, 0,
CK_NEWLINES_NOT_SPECIAL | CK_IGNORE_TABS | CK_FILL_UNTIL_EOL);
#endif
y++;
}
wmove(winPtr->window, cursorY, 0);
Ck_EventuallyRefresh(winPtr);
}
/*
*----------------------------------------------------------------------
*
* ListboxComputeGeometry --
*
* This procedure is invoked to recompute geometry information
* such as the sizes of the elements and the overall dimensions
* desired for the listbox.
*
* Results:
* None.
*
* Side effects:
* Geometry information is updated and a new requested size is
* registered for the widget. Internal border and gridding
* information is also set.
*
*----------------------------------------------------------------------
*/
static void
ListboxComputeGeometry(listPtr)
Listbox *listPtr; /* Listbox whose geometry is to be
* recomputed. */
{
int width, height;
width = listPtr->width;
if (width <= 0) {
width = listPtr->maxWidth;
if (width < 1) {
width = 1;
}
}
height = listPtr->height;
if (listPtr->height <= 0) {
height = listPtr->numElements;
if (height < 1) {
height = 1;
}
}
Ck_GeometryRequest(listPtr->winPtr, width, height);
}