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authorrjohnson <rjohnson>1998-04-01 09:51:44 (GMT)
committerrjohnson <rjohnson>1998-04-01 09:51:44 (GMT)
commit066ea7fd88d49cb456f74da71dbe875e4fc0aabb (patch)
tree8fb30cb152c4dc191be47fa043d2e6f5ea38c7ba /generic/tkListbox.c
parent13242623d2ff3ea02ab6a62bfb48a7dbb5c27e22 (diff)
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Initial revision
Diffstat (limited to 'generic/tkListbox.c')
-rw-r--r--generic/tkListbox.c2335
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diff --git a/generic/tkListbox.c b/generic/tkListbox.c
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--- /dev/null
+++ b/generic/tkListbox.c
@@ -0,0 +1,2335 @@
+/*
+ * tkListbox.c --
+ *
+ * This module implements listbox widgets for the Tk
+ * 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) 1994-1997 Sun Microsystems, Inc.
+ *
+ * See the file "license.terms" for information on usage and redistribution
+ * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ *
+ * SCCS: @(#) tkListbox.c 1.120 97/10/29 13:06:59
+ */
+
+#include "tkPort.h"
+#include "default.h"
+#include "tkInt.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 lBearing; /* Distance from first character's
+ * origin to left edge of character. */
+ int pixelWidth; /* Total width of element in pixels (including
+ * left bearing and right bearing). */
+ 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) \
+ ((unsigned) (sizeof(Element) - 3 + stringLength))
+
+/*
+ * A data structure of the following type is kept for each listbox
+ * widget managed by this file:
+ */
+
+typedef struct {
+ Tk_Window tkwin; /* Window that embodies the listbox. NULL
+ * means that the window has been destroyed
+ * but the data structures haven't yet been
+ * cleaned up.*/
+ Display *display; /* Display containing widget. Used, among
+ * other things, so that resources can be
+ * freed even after tkwin has gone away. */
+ 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:
+ */
+
+ Tk_3DBorder normalBorder; /* Used for drawing border around whole
+ * window, plus used for background. */
+ int borderWidth; /* Width of 3-D border around window. */
+ int relief; /* 3-D effect: TK_RELIEF_RAISED, etc. */
+ int highlightWidth; /* Width in pixels of highlight to draw
+ * around widget when it has the focus.
+ * <= 0 means don't draw a highlight. */
+ XColor *highlightBgColorPtr;
+ /* Color for drawing traversal highlight
+ * area when highlight is off. */
+ XColor *highlightColorPtr; /* Color for drawing traversal highlight. */
+ int inset; /* Total width of all borders, including
+ * traversal highlight and 3-D border.
+ * Indicates how much interior stuff must
+ * be offset from outside edges to leave
+ * room for borders. */
+ Tk_Font tkfont; /* Information about text font, or NULL. */
+ XColor *fgColorPtr; /* Text color in normal mode. */
+ GC textGC; /* For drawing normal text. */
+ Tk_3DBorder selBorder; /* Borders and backgrounds for selected
+ * elements. */
+ int selBorderWidth; /* Width of border around selection. */
+ XColor *selFgColorPtr; /* Foreground color for selected elements. */
+ GC selTextGC; /* For drawing selected text. */
+ int width; /* Desired width of window, in characters. */
+ int height; /* Desired height of window, in lines. */
+ int lineHeight; /* Number of pixels allocated for each line
+ * in display. */
+ 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. */
+ int partialLine; /* 0 means that the window holds exactly
+ * fullLines lines. 1 means that there is
+ * one additional line that is partially
+ * visble. */
+ int setGrid; /* Non-zero means pass gridding information
+ * to window manager. */
+
+ /*
+ * Information to support horizontal scrolling:
+ */
+
+ int maxWidth; /* Width (in pixels) of widest string in
+ * listbox. */
+ int xScrollUnit; /* Number of pixels in one "unit" for
+ * horizontal scrolling (window scrolls
+ * horizontally in increments of this size).
+ * This is an average character size. */
+ int xOffset; /* The left edge of each string in the
+ * listbox is offset to the left by this
+ * many pixels (0 means no offset, positive
+ * means there is an offset). */
+
+ /*
+ * Information about what's selected or active, if any.
+ */
+
+ Tk_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 exportSelection; /* Non-zero means tie internal listbox
+ * to X selection. */
+ int active; /* Index of "active" element (the one that
+ * has been selected by keyboard traversal).
+ * -1 means none. */
+
+ /*
+ * Information for scanning:
+ */
+
+ int scanMarkX; /* X-position at which scan started (e.g.
+ * button was pressed here). */
+ int scanMarkY; /* Y-position at which scan started (e.g.
+ * button was pressed here). */
+ int scanMarkXOffset; /* Value of "xOffset" field when scan
+ * started. */
+ int scanMarkYIndex; /* Index of line that was at top of window
+ * when scan started. */
+
+ /*
+ * Miscellaneous information:
+ */
+
+ Tk_Cursor cursor; /* Current cursor for window, or None. */
+ 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 Tk_ConfigSpec configSpecs[] = {
+ {TK_CONFIG_BORDER, "-background", "background", "Background",
+ DEF_LISTBOX_BG_COLOR, Tk_Offset(Listbox, normalBorder),
+ TK_CONFIG_COLOR_ONLY},
+ {TK_CONFIG_BORDER, "-background", "background", "Background",
+ DEF_LISTBOX_BG_MONO, Tk_Offset(Listbox, normalBorder),
+ TK_CONFIG_MONO_ONLY},
+ {TK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL,
+ (char *) NULL, 0, 0},
+ {TK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL,
+ (char *) NULL, 0, 0},
+ {TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
+ DEF_LISTBOX_BORDER_WIDTH, Tk_Offset(Listbox, borderWidth), 0},
+ {TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
+ DEF_LISTBOX_CURSOR, Tk_Offset(Listbox, cursor), TK_CONFIG_NULL_OK},
+ {TK_CONFIG_BOOLEAN, "-exportselection", "exportSelection",
+ "ExportSelection", DEF_LISTBOX_EXPORT_SELECTION,
+ Tk_Offset(Listbox, exportSelection), 0},
+ {TK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
+ (char *) NULL, 0, 0},
+ {TK_CONFIG_FONT, "-font", "font", "Font",
+ DEF_LISTBOX_FONT, Tk_Offset(Listbox, tkfont), 0},
+ {TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
+ DEF_LISTBOX_FG, Tk_Offset(Listbox, fgColorPtr), 0},
+ {TK_CONFIG_INT, "-height", "height", "Height",
+ DEF_LISTBOX_HEIGHT, Tk_Offset(Listbox, height), 0},
+ {TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground",
+ "HighlightBackground", DEF_LISTBOX_HIGHLIGHT_BG,
+ Tk_Offset(Listbox, highlightBgColorPtr), 0},
+ {TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
+ DEF_LISTBOX_HIGHLIGHT, Tk_Offset(Listbox, highlightColorPtr), 0},
+ {TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",
+ "HighlightThickness",
+ DEF_LISTBOX_HIGHLIGHT_WIDTH, Tk_Offset(Listbox, highlightWidth), 0},
+ {TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
+ DEF_LISTBOX_RELIEF, Tk_Offset(Listbox, relief), 0},
+ {TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground",
+ DEF_LISTBOX_SELECT_COLOR, Tk_Offset(Listbox, selBorder),
+ TK_CONFIG_COLOR_ONLY},
+ {TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground",
+ DEF_LISTBOX_SELECT_MONO, Tk_Offset(Listbox, selBorder),
+ TK_CONFIG_MONO_ONLY},
+ {TK_CONFIG_PIXELS, "-selectborderwidth", "selectBorderWidth", "BorderWidth",
+ DEF_LISTBOX_SELECT_BD, Tk_Offset(Listbox, selBorderWidth), 0},
+ {TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
+ DEF_LISTBOX_SELECT_FG_COLOR, Tk_Offset(Listbox, selFgColorPtr),
+ TK_CONFIG_COLOR_ONLY},
+ {TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
+ DEF_LISTBOX_SELECT_FG_MONO, Tk_Offset(Listbox, selFgColorPtr),
+ TK_CONFIG_MONO_ONLY},
+ {TK_CONFIG_UID, "-selectmode", "selectMode", "SelectMode",
+ DEF_LISTBOX_SELECT_MODE, Tk_Offset(Listbox, selectMode), 0},
+ {TK_CONFIG_BOOLEAN, "-setgrid", "setGrid", "SetGrid",
+ DEF_LISTBOX_SET_GRID, Tk_Offset(Listbox, setGrid), 0},
+ {TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
+ DEF_LISTBOX_TAKE_FOCUS, Tk_Offset(Listbox, takeFocus),
+ TK_CONFIG_NULL_OK},
+ {TK_CONFIG_INT, "-width", "width", "Width",
+ DEF_LISTBOX_WIDTH, Tk_Offset(Listbox, width), 0},
+ {TK_CONFIG_STRING, "-xscrollcommand", "xScrollCommand", "ScrollCommand",
+ DEF_LISTBOX_SCROLL_COMMAND, Tk_Offset(Listbox, xScrollCmd),
+ TK_CONFIG_NULL_OK},
+ {TK_CONFIG_STRING, "-yscrollcommand", "yScrollCommand", "ScrollCommand",
+ DEF_LISTBOX_SCROLL_COMMAND, Tk_Offset(Listbox, yScrollCmd),
+ TK_CONFIG_NULL_OK},
+ {TK_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_((char *memPtr));
+static void DisplayListbox _ANSI_ARGS_((ClientData clientData));
+static int GetListboxIndex _ANSI_ARGS_((Tcl_Interp *interp,
+ Listbox *listPtr, char *string, int endIsSize,
+ 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,
+ int fontChanged, int maxIsStale, int updateGrid));
+static void ListboxEventProc _ANSI_ARGS_((ClientData clientData,
+ XEvent *eventPtr));
+static int ListboxFetchSelection _ANSI_ARGS_((
+ ClientData clientData, int offset, char *buffer,
+ int maxBytes));
+static void ListboxLostSelection _ANSI_ARGS_((
+ ClientData clientData));
+static void ListboxRedrawRange _ANSI_ARGS_((Listbox *listPtr,
+ int first, int last));
+static void ListboxScanTo _ANSI_ARGS_((Listbox *listPtr,
+ int x, int y));
+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 void ListboxWorldChanged _ANSI_ARGS_((
+ ClientData instanceData));
+static int NearestListboxElement _ANSI_ARGS_((Listbox *listPtr,
+ int y));
+
+/*
+ * The structure below defines button class behavior by means of procedures
+ * that can be invoked from generic window code.
+ */
+
+static TkClassProcs listboxClass = {
+ NULL, /* createProc. */
+ ListboxWorldChanged, /* geometryProc. */
+ NULL /* modalProc. */
+};
+
+
+/*
+ *--------------------------------------------------------------
+ *
+ * Tk_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
+Tk_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;
+ Tk_Window new;
+ Tk_Window tkwin = (Tk_Window) clientData;
+
+ if (argc < 2) {
+ Tcl_AppendResult(interp, "wrong # args: should be \"",
+ argv[0], " pathName ?options?\"", (char *) NULL);
+ return TCL_ERROR;
+ }
+
+ new = Tk_CreateWindowFromPath(interp, tkwin, argv[1], (char *) NULL);
+ 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->tkwin = new;
+ listPtr->display = Tk_Display(new);
+ listPtr->interp = interp;
+ listPtr->widgetCmd = Tcl_CreateCommand(interp,
+ Tk_PathName(listPtr->tkwin), ListboxWidgetCmd,
+ (ClientData) listPtr, ListboxCmdDeletedProc);
+ listPtr->numElements = 0;
+ listPtr->firstPtr = NULL;
+ listPtr->lastPtr = NULL;
+ listPtr->normalBorder = NULL;
+ listPtr->borderWidth = 0;
+ listPtr->relief = TK_RELIEF_RAISED;
+ listPtr->highlightWidth = 0;
+ listPtr->highlightBgColorPtr = NULL;
+ listPtr->highlightColorPtr = NULL;
+ listPtr->inset = 0;
+ listPtr->tkfont = NULL;
+ listPtr->fgColorPtr = NULL;
+ listPtr->textGC = None;
+ listPtr->selBorder = NULL;
+ listPtr->selBorderWidth = 0;
+ listPtr->selFgColorPtr = None;
+ listPtr->selTextGC = None;
+ listPtr->width = 0;
+ listPtr->height = 0;
+ listPtr->lineHeight = 0;
+ listPtr->topIndex = 0;
+ listPtr->fullLines = 1;
+ listPtr->partialLine = 0;
+ listPtr->setGrid = 0;
+ listPtr->maxWidth = 0;
+ listPtr->xScrollUnit = 1;
+ listPtr->xOffset = 0;
+ listPtr->selectMode = NULL;
+ listPtr->numSelected = 0;
+ listPtr->selectAnchor = 0;
+ listPtr->exportSelection = 1;
+ listPtr->active = 0;
+ listPtr->scanMarkX = 0;
+ listPtr->scanMarkY = 0;
+ listPtr->scanMarkXOffset = 0;
+ listPtr->scanMarkYIndex = 0;
+ listPtr->cursor = None;
+ listPtr->takeFocus = NULL;
+ listPtr->xScrollCmd = NULL;
+ listPtr->yScrollCmd = NULL;
+ listPtr->flags = 0;
+
+ Tk_SetClass(listPtr->tkwin, "Listbox");
+ TkSetClassProcs(listPtr->tkwin, &listboxClass, (ClientData) listPtr);
+ Tk_CreateEventHandler(listPtr->tkwin,
+ ExposureMask|StructureNotifyMask|FocusChangeMask,
+ ListboxEventProc, (ClientData) listPtr);
+ Tk_CreateSelHandler(listPtr->tkwin, XA_PRIMARY, XA_STRING,
+ ListboxFetchSelection, (ClientData) listPtr, XA_STRING);
+ if (ConfigureListbox(interp, listPtr, argc-2, argv+2, 0) != TCL_OK) {
+ goto error;
+ }
+
+ interp->result = Tk_PathName(listPtr->tkwin);
+ return TCL_OK;
+
+ error:
+ Tk_DestroyWindow(listPtr->tkwin);
+ 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;
+ Tk_FontMetrics fm;
+
+ if (argc < 2) {
+ Tcl_AppendResult(interp, "wrong # args: should be \"",
+ argv[0], " option ?arg arg ...?\"", (char *) NULL);
+ return TCL_ERROR;
+ }
+ Tcl_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;
+ }
+ if (index >= listPtr->numElements) {
+ index = listPtr->numElements-1;
+ }
+ if (index < 0) {
+ index = 0;
+ }
+ listPtr->active = index;
+ ListboxRedrawRange(listPtr, listPtr->active, listPtr->active);
+ } else if ((c == 'b') && (strncmp(argv[1], "bbox", length) == 0)) {
+ int index, x, y, i;
+ Element *elPtr;
+
+ if (argc != 3) {
+ Tcl_AppendResult(interp, "wrong # args: should be \"",
+ argv[0], " bbox index\"", (char *) NULL);
+ goto error;
+ }
+ if (GetListboxIndex(interp, listPtr, argv[2], 0, &index) != TCL_OK) {
+ goto error;
+ }
+ if ((index >= listPtr->numElements) || (index < 0)) {
+ goto done;
+ }
+ for (i = 0, elPtr = listPtr->firstPtr; i < index;
+ i++, elPtr = elPtr->nextPtr) {
+ /* Empty loop body. */
+ }
+ if ((index >= listPtr->topIndex) && (index < listPtr->numElements)
+ && (index < (listPtr->topIndex + listPtr->fullLines
+ + listPtr->partialLine))) {
+ x = listPtr->inset + listPtr->selBorderWidth - listPtr->xOffset;
+ y = ((index - listPtr->topIndex)*listPtr->lineHeight)
+ + listPtr->inset + listPtr->selBorderWidth;
+ Tk_GetFontMetrics(listPtr->tkfont, &fm);
+ sprintf(interp->result, "%d %d %d %d", x, y, elPtr->pixelWidth,
+ fm.linespace);
+ }
+ } 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 = Tk_ConfigureValue(interp, listPtr->tkwin, configSpecs,
+ (char *) listPtr, argv[2], 0);
+ } else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)
+ && (length >= 2)) {
+ if (argc == 2) {
+ result = Tk_ConfigureInfo(interp, listPtr->tkwin, configSpecs,
+ (char *) listPtr, (char *) NULL, 0);
+ } else if (argc == 3) {
+ result = Tk_ConfigureInfo(interp, listPtr->tkwin, configSpecs,
+ (char *) listPtr, argv[2], 0);
+ } else {
+ result = ConfigureListbox(interp, listPtr, argc-2, argv+2,
+ TK_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 (first < listPtr->numElements) {
+ if (argc == 3) {
+ last = first;
+ } else {
+ if (GetListboxIndex(interp, listPtr, argv[3], 0,
+ &last) != TCL_OK) {
+ goto error;
+ }
+ if (last >= listPtr->numElements) {
+ last = listPtr->numElements-1;
+ }
+ }
+ 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;
+ }
+ if (first >= listPtr->numElements) {
+ goto done;
+ }
+ if (last >= listPtr->numElements) {
+ last = listPtr->numElements-1;
+ }
+
+ for (elPtr = listPtr->firstPtr, i = 0; i < first;
+ i++, elPtr = elPtr->nextPtr) {
+ /* Empty loop body. */
+ }
+ if (elPtr != NULL) {
+ if (argc == 3) {
+ if (first >= 0) {
+ interp->result = elPtr->text;
+ }
+ } 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;
+ }
+ sprintf(interp->result, "%d", index);
+ } 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);
+ sprintf(interp->result, "%d", index);
+ } else if ((c == 's') && (length >= 2)
+ && (strncmp(argv[1], "scan", length) == 0)) {
+ int x, y;
+
+ if (argc != 5) {
+ Tcl_AppendResult(interp, "wrong # args: should be \"",
+ argv[0], " scan mark|dragto x y\"", (char *) NULL);
+ goto error;
+ }
+ if ((Tcl_GetInt(interp, argv[3], &x) != TCL_OK)
+ || (Tcl_GetInt(interp, argv[4], &y) != TCL_OK)) {
+ goto error;
+ }
+ if ((argv[2][0] == 'm')
+ && (strncmp(argv[2], "mark", strlen(argv[2])) == 0)) {
+ listPtr->scanMarkX = x;
+ listPtr->scanMarkY = y;
+ listPtr->scanMarkXOffset = listPtr->xOffset;
+ listPtr->scanMarkYIndex = listPtr->topIndex;
+ } else if ((argv[2][0] == 'd')
+ && (strncmp(argv[2], "dragto", strlen(argv[2])) == 0)) {
+ ListboxScanTo(listPtr, x, y);
+ } else {
+ Tcl_AppendResult(interp, "bad scan option \"", argv[2],
+ "\": must be mark or dragto", (char *) NULL);
+ goto error;
+ }
+ } 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;
+ }
+ if (index >= listPtr->numElements) {
+ index = listPtr->numElements-1;
+ }
+ if (index < 0) {
+ index = 0;
+ }
+ 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;
+ }
+ if (first >= listPtr->numElements) {
+ first = listPtr->numElements-1;
+ }
+ if (first < 0) {
+ first = 0;
+ }
+ 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;
+ }
+ if ((first < 0) || (first >= listPtr->numElements)) {
+ interp->result = "0";
+ goto done;
+ }
+ for (elPtr = listPtr->firstPtr, i = 0; i < first;
+ i++, elPtr = elPtr->nextPtr) {
+ /* Empty loop body. */
+ }
+ if (elPtr->selected) {
+ interp->result = "1";
+ } else {
+ interp->result = "0";
+ }
+ } 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;
+ }
+ sprintf(interp->result, "%d", listPtr->numElements);
+ } else if ((c == 'x') && (strncmp(argv[1], "xview", length) == 0)) {
+ int index, count, type, windowWidth, windowUnits;
+ int offset = 0; /* Initialized to stop gcc warnings. */
+ double fraction, fraction2;
+
+ windowWidth = Tk_Width(listPtr->tkwin)
+ - 2*(listPtr->inset + listPtr->selBorderWidth);
+ if (argc == 2) {
+ if (listPtr->maxWidth == 0) {
+ interp->result = "0 1";
+ } else {
+ fraction = listPtr->xOffset/((double) listPtr->maxWidth);
+ fraction2 = (listPtr->xOffset + windowWidth)
+ /((double) listPtr->maxWidth);
+ if (fraction2 > 1.0) {
+ fraction2 = 1.0;
+ }
+ sprintf(interp->result, "%g %g", fraction, fraction2);
+ }
+ } else if (argc == 3) {
+ if (Tcl_GetInt(interp, argv[2], &index) != TCL_OK) {
+ goto error;
+ }
+ ChangeListboxOffset(listPtr, index*listPtr->xScrollUnit);
+ } else {
+ type = Tk_GetScrollInfo(interp, argc, argv, &fraction, &count);
+ switch (type) {
+ case TK_SCROLL_ERROR:
+ goto error;
+ case TK_SCROLL_MOVETO:
+ offset = (int) (fraction*listPtr->maxWidth + 0.5);
+ break;
+ case TK_SCROLL_PAGES:
+ windowUnits = windowWidth/listPtr->xScrollUnit;
+ if (windowUnits > 2) {
+ offset = listPtr->xOffset
+ + count*listPtr->xScrollUnit*(windowUnits-2);
+ } else {
+ offset = listPtr->xOffset + count*listPtr->xScrollUnit;
+ }
+ break;
+ case TK_SCROLL_UNITS:
+ offset = listPtr->xOffset + count*listPtr->xScrollUnit;
+ 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) {
+ interp->result = "0 1";
+ } else {
+ fraction = listPtr->topIndex/((double) listPtr->numElements);
+ fraction2 = (listPtr->topIndex+listPtr->fullLines)
+ /((double) listPtr->numElements);
+ if (fraction2 > 1.0) {
+ fraction2 = 1.0;
+ }
+ sprintf(interp->result, "%g %g", fraction, fraction2);
+ }
+ } else if (argc == 3) {
+ if (GetListboxIndex(interp, listPtr, argv[2], 0, &index)
+ != TCL_OK) {
+ goto error;
+ }
+ ChangeListboxView(listPtr, index);
+ } else {
+ type = Tk_GetScrollInfo(interp, argc, argv, &fraction, &count);
+ switch (type) {
+ case TK_SCROLL_ERROR:
+ goto error;
+ case TK_SCROLL_MOVETO:
+ index = (int) (listPtr->numElements*fraction + 0.5);
+ break;
+ case TK_SCROLL_PAGES:
+ if (listPtr->fullLines > 2) {
+ index = listPtr->topIndex
+ + count*(listPtr->fullLines-2);
+ } else {
+ index = listPtr->topIndex + count;
+ }
+ break;
+ case TK_SCROLL_UNITS:
+ index = listPtr->topIndex + count;
+ break;
+ }
+ ChangeListboxView(listPtr, index);
+ }
+ } else {
+ Tcl_AppendResult(interp, "bad option \"", argv[1],
+ "\": must be activate, bbox, cget, configure, ",
+ "curselection, delete, get, index, insert, nearest, ",
+ "scan, see, selection, size, ",
+ "xview, or yview", (char *) NULL);
+ goto error;
+ }
+ done:
+ Tcl_Release((ClientData) listPtr);
+ return result;
+
+ error:
+ Tcl_Release((ClientData) listPtr);
+ return TCL_ERROR;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * DestroyListbox --
+ *
+ * This procedure is invoked by Tcl_EventuallyFree or Tcl_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(memPtr)
+ char *memPtr; /* Info about listbox widget. */
+{
+ register Listbox *listPtr = (Listbox *) memPtr;
+ 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;
+ }
+
+ /*
+ * Free up all the stuff that requires special handling, then
+ * let Tk_FreeOptions handle all the standard option-related
+ * stuff.
+ */
+
+ if (listPtr->textGC != None) {
+ Tk_FreeGC(listPtr->display, listPtr->textGC);
+ }
+ if (listPtr->selTextGC != None) {
+ Tk_FreeGC(listPtr->display, listPtr->selTextGC);
+ }
+ Tk_FreeOptions(configSpecs, (char *) listPtr, listPtr->display, 0);
+ ckfree((char *) listPtr);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ConfigureListbox --
+ *
+ * This procedure is called to process an argv/argc list, plus
+ * the Tk 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 Tk_ConfigureWidget. */
+{
+ int oldExport;
+
+ oldExport = listPtr->exportSelection;
+ if (Tk_ConfigureWidget(interp, listPtr->tkwin, configSpecs,
+ argc, argv, (char *) listPtr, flags) != TCL_OK) {
+ return TCL_ERROR;
+ }
+
+ /*
+ * A few options need special processing, such as setting the
+ * background from a 3-D border.
+ */
+
+ Tk_SetBackgroundFromBorder(listPtr->tkwin, listPtr->normalBorder);
+
+ if (listPtr->highlightWidth < 0) {
+ listPtr->highlightWidth = 0;
+ }
+ listPtr->inset = listPtr->highlightWidth + listPtr->borderWidth;
+
+ /*
+ * Claim the selection if we've suddenly started exporting it and
+ * there is a selection to export.
+ */
+
+ if (listPtr->exportSelection && !oldExport
+ && (listPtr->numSelected != 0)) {
+ Tk_OwnSelection(listPtr->tkwin, XA_PRIMARY, ListboxLostSelection,
+ (ClientData) listPtr);
+ }
+
+ ListboxWorldChanged((ClientData) listPtr);
+ return TCL_OK;
+}
+
+/*
+ *---------------------------------------------------------------------------
+ *
+ * ListboxWorldChanged --
+ *
+ * This procedure is called when the world has changed in some
+ * way and the widget needs to recompute all its graphics contexts
+ * and determine its new geometry.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * Listbox will be relayed out and redisplayed.
+ *
+ *---------------------------------------------------------------------------
+ */
+
+static void
+ListboxWorldChanged(instanceData)
+ ClientData instanceData; /* Information about widget. */
+{
+ XGCValues gcValues;
+ GC gc;
+ unsigned long mask;
+ Listbox *listPtr;
+
+ listPtr = (Listbox *) instanceData;
+
+ gcValues.foreground = listPtr->fgColorPtr->pixel;
+ gcValues.font = Tk_FontId(listPtr->tkfont);
+ gcValues.graphics_exposures = False;
+ mask = GCForeground | GCFont | GCGraphicsExposures;
+ gc = Tk_GetGC(listPtr->tkwin, mask, &gcValues);
+ if (listPtr->textGC != None) {
+ Tk_FreeGC(listPtr->display, listPtr->textGC);
+ }
+ listPtr->textGC = gc;
+
+ gcValues.foreground = listPtr->selFgColorPtr->pixel;
+ gcValues.font = Tk_FontId(listPtr->tkfont);
+ mask = GCForeground | GCFont;
+ gc = Tk_GetGC(listPtr->tkwin, mask, &gcValues);
+ if (listPtr->selTextGC != None) {
+ Tk_FreeGC(listPtr->display, listPtr->selTextGC);
+ }
+ listPtr->selTextGC = gc;
+
+ /*
+ * Register the desired geometry for the window and arrange for
+ * the window to be redisplayed.
+ */
+
+ ListboxComputeGeometry(listPtr, 1, 1, 1);
+ listPtr->flags |= UPDATE_V_SCROLLBAR|UPDATE_H_SCROLLBAR;
+ ListboxRedrawRange(listPtr, 0, listPtr->numElements-1);
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * 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. */
+{
+ register Listbox *listPtr = (Listbox *) clientData;
+ register Tk_Window tkwin = listPtr->tkwin;
+ register Element *elPtr;
+ GC gc;
+ int i, limit, x, y, width, prevSelected;
+ Tk_FontMetrics fm;
+ int left, right; /* Non-zero values here indicate
+ * that the left or right edge of
+ * the listbox is off-screen. */
+ Pixmap pixmap;
+
+ 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->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
+ return;
+ }
+
+ /*
+ * Redrawing is done in a temporary pixmap that is allocated
+ * here and freed at the end of the procedure. All drawing is
+ * done to the pixmap, and the pixmap is copied to the screen
+ * at the end of the procedure. This provides the smoothest
+ * possible visual effects (no flashing on the screen).
+ */
+
+ pixmap = Tk_GetPixmap(listPtr->display, Tk_WindowId(tkwin),
+ Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));
+ Tk_Fill3DRectangle(tkwin, pixmap, listPtr->normalBorder, 0, 0,
+ Tk_Width(tkwin), Tk_Height(tkwin), 0, TK_RELIEF_FLAT);
+
+ /*
+ * Iterate through all of the elements of the listbox, displaying each
+ * in turn. Selected elements use a different GC and have a raised
+ * background.
+ */
+
+ limit = listPtr->topIndex + listPtr->fullLines + listPtr->partialLine - 1;
+ if (limit >= listPtr->numElements) {
+ limit = listPtr->numElements-1;
+ }
+ left = right = 0;
+ if (listPtr->xOffset > 0) {
+ left = listPtr->selBorderWidth+1;
+ }
+ if ((listPtr->maxWidth - listPtr->xOffset) > (Tk_Width(listPtr->tkwin)
+ - 2*(listPtr->inset + listPtr->selBorderWidth))) {
+ right = listPtr->selBorderWidth+1;
+ }
+ prevSelected = 0;
+ for (elPtr = listPtr->firstPtr, i = 0; (elPtr != NULL) && (i <= limit);
+ prevSelected = elPtr->selected, elPtr = elPtr->nextPtr, i++) {
+ if (i < listPtr->topIndex) {
+ continue;
+ }
+ x = listPtr->inset;
+ y = ((i - listPtr->topIndex) * listPtr->lineHeight)
+ + listPtr->inset;
+ gc = listPtr->textGC;
+ if (elPtr->selected) {
+ gc = listPtr->selTextGC;
+ width = Tk_Width(tkwin) - 2*listPtr->inset;
+ Tk_Fill3DRectangle(tkwin, pixmap, listPtr->selBorder, x, y,
+ width, listPtr->lineHeight, 0, TK_RELIEF_FLAT);
+
+ /*
+ * Draw beveled edges around the selection, if there are visible
+ * edges next to this element. Special considerations:
+ * 1. The left and right bevels may not be visible if horizontal
+ * scrolling is enabled (the "left" and "right" variables
+ * are zero to indicate that the corresponding bevel is
+ * visible).
+ * 2. Top and bottom bevels are only drawn if this is the
+ * first or last seleted item.
+ * 3. If the left or right bevel isn't visible, then the "left"
+ * and "right" variables, computed above, have non-zero values
+ * that extend the top and bottom bevels so that the mitered
+ * corners are off-screen.
+ */
+
+ if (left == 0) {
+ Tk_3DVerticalBevel(tkwin, pixmap, listPtr->selBorder,
+ x, y, listPtr->selBorderWidth, listPtr->lineHeight,
+ 1, TK_RELIEF_RAISED);
+ }
+ if (right == 0) {
+ Tk_3DVerticalBevel(tkwin, pixmap, listPtr->selBorder,
+ x + width - listPtr->selBorderWidth, y,
+ listPtr->selBorderWidth, listPtr->lineHeight,
+ 0, TK_RELIEF_RAISED);
+ }
+ if (!prevSelected) {
+ Tk_3DHorizontalBevel(tkwin, pixmap, listPtr->selBorder,
+ x-left, y, width+left+right, listPtr->selBorderWidth,
+ 1, 1, 1, TK_RELIEF_RAISED);
+ }
+ if ((elPtr->nextPtr == NULL) || !elPtr->nextPtr->selected) {
+ Tk_3DHorizontalBevel(tkwin, pixmap, listPtr->selBorder, x-left,
+ y + listPtr->lineHeight - listPtr->selBorderWidth,
+ width+left+right, listPtr->selBorderWidth, 0, 0, 0,
+ TK_RELIEF_RAISED);
+ }
+ }
+ Tk_GetFontMetrics(listPtr->tkfont, &fm);
+ y += fm.ascent + listPtr->selBorderWidth;
+ x = listPtr->inset + listPtr->selBorderWidth - elPtr->lBearing
+ - listPtr->xOffset;
+ Tk_DrawChars(listPtr->display, pixmap, gc, listPtr->tkfont,
+ elPtr->text, elPtr->textLength, x, y);
+
+ /*
+ * If this is the active element, underline it.
+ */
+
+ if ((i == listPtr->active) && (listPtr->flags & GOT_FOCUS)) {
+ Tk_UnderlineChars(listPtr->display, pixmap, gc, listPtr->tkfont,
+ elPtr->text, x, y, 0, elPtr->textLength);
+ }
+ }
+
+ /*
+ * Redraw the border for the listbox to make sure that it's on top
+ * of any of the text of the listbox entries.
+ */
+
+ Tk_Draw3DRectangle(tkwin, pixmap, listPtr->normalBorder,
+ listPtr->highlightWidth, listPtr->highlightWidth,
+ Tk_Width(tkwin) - 2*listPtr->highlightWidth,
+ Tk_Height(tkwin) - 2*listPtr->highlightWidth,
+ listPtr->borderWidth, listPtr->relief);
+ if (listPtr->highlightWidth > 0) {
+ GC gc;
+
+ if (listPtr->flags & GOT_FOCUS) {
+ gc = Tk_GCForColor(listPtr->highlightColorPtr, pixmap);
+ } else {
+ gc = Tk_GCForColor(listPtr->highlightBgColorPtr, pixmap);
+ }
+ Tk_DrawFocusHighlight(tkwin, gc, listPtr->highlightWidth, pixmap);
+ }
+ XCopyArea(listPtr->display, pixmap, Tk_WindowId(tkwin),
+ listPtr->textGC, 0, 0, (unsigned) Tk_Width(tkwin),
+ (unsigned) Tk_Height(tkwin), 0, 0);
+ Tk_FreePixmap(listPtr->display, pixmap);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * 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, fontChanged, maxIsStale, updateGrid)
+ Listbox *listPtr; /* Listbox whose geometry is to be
+ * recomputed. */
+ int fontChanged; /* Non-zero means the font may have changed
+ * so per-element width information also
+ * has to be computed. */
+ int maxIsStale; /* Non-zero means the "maxWidth" field may
+ * no longer be up-to-date and must
+ * be recomputed. If fontChanged is 1 then
+ * this must be 1. */
+ int updateGrid; /* Non-zero means call Tk_SetGrid or
+ * Tk_UnsetGrid to update gridding for
+ * the window. */
+{
+ register Element *elPtr;
+ int width, height, pixelWidth, pixelHeight;
+ Tk_FontMetrics fm;
+
+ if (fontChanged || maxIsStale) {
+ listPtr->xScrollUnit = Tk_TextWidth(listPtr->tkfont, "0", 1);
+ if (listPtr->xScrollUnit == 0) {
+ listPtr->xScrollUnit = 1;
+ }
+ listPtr->maxWidth = 0;
+ for (elPtr = listPtr->firstPtr; elPtr != NULL; elPtr = elPtr->nextPtr) {
+ if (fontChanged) {
+ elPtr->pixelWidth = Tk_TextWidth(listPtr->tkfont,
+ elPtr->text, elPtr->textLength);
+ elPtr->lBearing = 0;
+ }
+ if (elPtr->pixelWidth > listPtr->maxWidth) {
+ listPtr->maxWidth = elPtr->pixelWidth;
+ }
+ }
+ }
+
+ Tk_GetFontMetrics(listPtr->tkfont, &fm);
+ listPtr->lineHeight = fm.linespace + 1 + 2*listPtr->selBorderWidth;
+ width = listPtr->width;
+ if (width <= 0) {
+ width = (listPtr->maxWidth + listPtr->xScrollUnit - 1)
+ /listPtr->xScrollUnit;
+ if (width < 1) {
+ width = 1;
+ }
+ }
+ pixelWidth = width*listPtr->xScrollUnit + 2*listPtr->inset
+ + 2*listPtr->selBorderWidth;
+ height = listPtr->height;
+ if (listPtr->height <= 0) {
+ height = listPtr->numElements;
+ if (height < 1) {
+ height = 1;
+ }
+ }
+ pixelHeight = height*listPtr->lineHeight + 2*listPtr->inset;
+ Tk_GeometryRequest(listPtr->tkwin, pixelWidth, pixelHeight);
+ Tk_SetInternalBorder(listPtr->tkwin, listPtr->inset);
+ if (updateGrid) {
+ if (listPtr->setGrid) {
+ Tk_SetGrid(listPtr->tkwin, width, height, listPtr->xScrollUnit,
+ listPtr->lineHeight);
+ } else {
+ Tk_UnsetGrid(listPtr->tkwin);
+ }
+ }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * InsertEls --
+ *
+ * Add new elements to a listbox widget.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * New information gets added to listPtr; it will be redisplayed
+ * soon, but not immediately.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+InsertEls(listPtr, index, argc, argv)
+ register Listbox *listPtr; /* Listbox that is to get the new
+ * elements. */
+ int index; /* Add the new elements before this
+ * element. */
+ int argc; /* Number of new elements to add. */
+ char **argv; /* New elements (one per entry). */
+{
+ register Element *prevPtr, *newPtr;
+ int length, i, oldMaxWidth;
+
+ /*
+ * Find the element before which the new ones will be inserted.
+ */
+
+ if (index <= 0) {
+ index = 0;
+ }
+ if (index > listPtr->numElements) {
+ index = listPtr->numElements;
+ }
+ if (index == 0) {
+ prevPtr = NULL;
+ } else if (index == listPtr->numElements) {
+ prevPtr = listPtr->lastPtr;
+ } else {
+ for (prevPtr = listPtr->firstPtr, i = index - 1; i > 0; i--) {
+ prevPtr = prevPtr->nextPtr;
+ }
+ }
+
+ /*
+ * For each new element, create a record, initialize it, and link
+ * it into the list of elements.
+ */
+
+ oldMaxWidth = listPtr->maxWidth;
+ for (i = argc ; i > 0; i--, argv++, prevPtr = newPtr) {
+ length = strlen(*argv);
+ newPtr = (Element *) ckalloc(ElementSize(length));
+ newPtr->textLength = length;
+ strcpy(newPtr->text, *argv);
+ newPtr->pixelWidth = Tk_TextWidth(listPtr->tkfont, newPtr->text,
+ newPtr->textLength);
+ newPtr->lBearing = 0;
+ if (newPtr->pixelWidth > listPtr->maxWidth) {
+ listPtr->maxWidth = newPtr->pixelWidth;
+ }
+ newPtr->selected = 0;
+ if (prevPtr == NULL) {
+ newPtr->nextPtr = listPtr->firstPtr;
+ listPtr->firstPtr = newPtr;
+ } else {
+ newPtr->nextPtr = prevPtr->nextPtr;
+ prevPtr->nextPtr = newPtr;
+ }
+ }
+ if ((prevPtr != NULL) && (prevPtr->nextPtr == NULL)) {
+ listPtr->lastPtr = prevPtr;
+ }
+ listPtr->numElements += argc;
+
+ /*
+ * Update the selection and other indexes to account for the
+ * renumbering that has just occurred. Then arrange for the new
+ * information to be displayed.
+ */
+
+ if (index <= listPtr->selectAnchor) {
+ listPtr->selectAnchor += argc;
+ }
+ if (index < listPtr->topIndex) {
+ listPtr->topIndex += argc;
+ }
+ if (index <= listPtr->active) {
+ listPtr->active += argc;
+ if ((listPtr->active >= listPtr->numElements)
+ && (listPtr->numElements > 0)) {
+ listPtr->active = listPtr->numElements-1;
+ }
+ }
+ listPtr->flags |= UPDATE_V_SCROLLBAR;
+ if (listPtr->maxWidth != oldMaxWidth) {
+ listPtr->flags |= UPDATE_H_SCROLLBAR;
+ }
+ ListboxComputeGeometry(listPtr, 0, 0, 0);
+ ListboxRedrawRange(listPtr, index, listPtr->numElements-1);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * DeleteEls --
+ *
+ * Remove one or more elements from a listbox widget.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * Memory gets freed, the listbox gets modified and (eventually)
+ * redisplayed.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+DeleteEls(listPtr, first, last)
+ register Listbox *listPtr; /* Listbox widget to modify. */
+ int first; /* Index of first element to delete. */
+ int last; /* Index of last element to delete. */
+{
+ register Element *prevPtr, *elPtr;
+ int count, i, widthChanged;
+
+ /*
+ * Adjust the range to fit within the existing elements of the
+ * listbox, and make sure there's something to delete.
+ */
+
+ if (first < 0) {
+ first = 0;
+ }
+ if (last >= listPtr->numElements) {
+ last = listPtr->numElements-1;
+ }
+ count = last + 1 - first;
+ if (count <= 0) {
+ return;
+ }
+
+ /*
+ * Find the element just before the ones to delete.
+ */
+
+ if (first == 0) {
+ prevPtr = NULL;
+ } else {
+ for (i = first-1, prevPtr = listPtr->firstPtr; i > 0; i--) {
+ prevPtr = prevPtr->nextPtr;
+ }
+ }
+
+ /*
+ * Delete the requested number of elements.
+ */
+
+ widthChanged = 0;
+ for (i = count; i > 0; i--) {
+ if (prevPtr == NULL) {
+ elPtr = listPtr->firstPtr;
+ listPtr->firstPtr = elPtr->nextPtr;
+ if (listPtr->firstPtr == NULL) {
+ listPtr->lastPtr = NULL;
+ }
+ } else {
+ elPtr = prevPtr->nextPtr;
+ prevPtr->nextPtr = elPtr->nextPtr;
+ if (prevPtr->nextPtr == NULL) {
+ listPtr->lastPtr = prevPtr;
+ }
+ }
+ if (elPtr->pixelWidth == listPtr->maxWidth) {
+ widthChanged = 1;
+ }
+ if (elPtr->selected) {
+ listPtr->numSelected -= 1;
+ }
+ ckfree((char *) elPtr);
+ }
+ listPtr->numElements -= count;
+
+ /*
+ * Update the selection and viewing information to reflect the change
+ * in the element numbering, and redisplay to slide information up over
+ * the elements that were deleted.
+ */
+
+ if (first <= listPtr->selectAnchor) {
+ listPtr->selectAnchor -= count;
+ if (listPtr->selectAnchor < first) {
+ listPtr->selectAnchor = first;
+ }
+ }
+ if (first <= listPtr->topIndex) {
+ listPtr->topIndex -= count;
+ if (listPtr->topIndex < first) {
+ listPtr->topIndex = first;
+ }
+ }
+ if (listPtr->topIndex > (listPtr->numElements - listPtr->fullLines)) {
+ listPtr->topIndex = listPtr->numElements - listPtr->fullLines;
+ if (listPtr->topIndex < 0) {
+ listPtr->topIndex = 0;
+ }
+ }
+ if (listPtr->active > last) {
+ listPtr->active -= count;
+ } else if (listPtr->active >= first) {
+ listPtr->active = first;
+ if ((listPtr->active >= listPtr->numElements)
+ && (listPtr->numElements > 0)) {
+ listPtr->active = listPtr->numElements-1;
+ }
+ }
+ listPtr->flags |= UPDATE_V_SCROLLBAR;
+ ListboxComputeGeometry(listPtr, 0, widthChanged, 0);
+ if (widthChanged) {
+ listPtr->flags |= UPDATE_H_SCROLLBAR;
+ }
+ ListboxRedrawRange(listPtr, first, listPtr->numElements-1);
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * ListboxEventProc --
+ *
+ * This procedure is invoked by the Tk dispatcher for various
+ * events on listboxes.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * When the window gets deleted, internal structures get
+ * cleaned up. When it gets exposed, it is redisplayed.
+ *
+ *--------------------------------------------------------------
+ */
+
+static void
+ListboxEventProc(clientData, eventPtr)
+ ClientData clientData; /* Information about window. */
+ XEvent *eventPtr; /* Information about event. */
+{
+ Listbox *listPtr = (Listbox *) clientData;
+
+ if (eventPtr->type == Expose) {
+ ListboxRedrawRange(listPtr,
+ NearestListboxElement(listPtr, eventPtr->xexpose.y),
+ NearestListboxElement(listPtr, eventPtr->xexpose.y
+ + eventPtr->xexpose.height));
+ } else if (eventPtr->type == DestroyNotify) {
+ if (listPtr->tkwin != NULL) {
+ if (listPtr->setGrid) {
+ Tk_UnsetGrid(listPtr->tkwin);
+ }
+ listPtr->tkwin = NULL;
+ Tcl_DeleteCommandFromToken(listPtr->interp, listPtr->widgetCmd);
+ }
+ if (listPtr->flags & REDRAW_PENDING) {
+ Tcl_CancelIdleCall(DisplayListbox, (ClientData) listPtr);
+ }
+ Tcl_EventuallyFree((ClientData) listPtr, DestroyListbox);
+ } else if (eventPtr->type == ConfigureNotify) {
+ int vertSpace;
+
+ vertSpace = Tk_Height(listPtr->tkwin) - 2*listPtr->inset;
+ listPtr->fullLines = vertSpace / listPtr->lineHeight;
+ if ((listPtr->fullLines*listPtr->lineHeight) < vertSpace) {
+ listPtr->partialLine = 1;
+ } else {
+ listPtr->partialLine = 0;
+ }
+ listPtr->flags |= UPDATE_V_SCROLLBAR|UPDATE_H_SCROLLBAR;
+ ChangeListboxView(listPtr, listPtr->topIndex);
+ ChangeListboxOffset(listPtr, listPtr->xOffset);
+
+ /*
+ * Redraw the whole listbox. It's hard to tell what needs
+ * to be redrawn (e.g. if the listbox has shrunk then we
+ * may only need to redraw the borders), so just redraw
+ * everything for safety.
+ */
+
+ ListboxRedrawRange(listPtr, 0, listPtr->numElements-1);
+ } else if (eventPtr->type == FocusIn) {
+ if (eventPtr->xfocus.detail != NotifyInferior) {
+ listPtr->flags |= GOT_FOCUS;
+ ListboxRedrawRange(listPtr, 0, listPtr->numElements-1);
+ }
+ } else if (eventPtr->type == FocusOut) {
+ if (eventPtr->xfocus.detail != NotifyInferior) {
+ listPtr->flags &= ~GOT_FOCUS;
+ ListboxRedrawRange(listPtr, 0, listPtr->numElements-1);
+ }
+ }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * 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;
+ Tk_Window tkwin = listPtr->tkwin;
+
+ /*
+ * This procedure could be invoked either because the window was
+ * destroyed and the command was then deleted (in which case tkwin
+ * is NULL) or because the command was deleted, and then this procedure
+ * destroys the widget.
+ */
+
+ if (tkwin != NULL) {
+ if (listPtr->setGrid) {
+ Tk_UnsetGrid(listPtr->tkwin);
+ }
+ listPtr->tkwin = NULL;
+ Tk_DestroyWindow(tkwin);
+ }
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * GetListboxIndex --
+ *
+ * Parse an index into a listbox and return either its value
+ * or an error.
+ *
+ * Results:
+ * A standard Tcl result. If all went well, then *indexPtr is
+ * filled in with the index (into listPtr) corresponding to
+ * string. Otherwise an error message is left in interp->result.
+ *
+ * Side effects:
+ * None.
+ *
+ *--------------------------------------------------------------
+ */
+
+static int
+GetListboxIndex(interp, listPtr, string, endIsSize, indexPtr)
+ Tcl_Interp *interp; /* For error messages. */
+ Listbox *listPtr; /* Listbox for which the index is being
+ * specified. */
+ char *string; /* Specifies an element in the listbox. */
+ int endIsSize; /* If 1, "end" refers to the number of
+ * entries in the listbox. If 0, "end"
+ * refers to 1 less than the number of
+ * entries. */
+ int *indexPtr; /* Where to store converted index. */
+{
+ int c;
+ size_t length;
+
+ length = strlen(string);
+ c = string[0];
+ if ((c == 'a') && (strncmp(string, "active", length) == 0)
+ && (length >= 2)) {
+ *indexPtr = listPtr->active;
+ } else if ((c == 'a') && (strncmp(string, "anchor", length) == 0)
+ && (length >= 2)) {
+ *indexPtr = listPtr->selectAnchor;
+ } else if ((c == 'e') && (strncmp(string, "end", length) == 0)) {
+ if (endIsSize) {
+ *indexPtr = listPtr->numElements;
+ } else {
+ *indexPtr = listPtr->numElements - 1;
+ }
+ } else if (c == '@') {
+ int y;
+ char *p, *end;
+
+ p = string+1;
+ strtol(p, &end, 0);
+ if ((end == p) || (*end != ',')) {
+ goto badIndex;
+ }
+ p = end+1;
+ y = strtol(p, &end, 0);
+ if ((end == p) || (*end != 0)) {
+ goto badIndex;
+ }
+ *indexPtr = NearestListboxElement(listPtr, y);
+ } else {
+ if (Tcl_GetInt(interp, string, indexPtr) != TCL_OK) {
+ Tcl_ResetResult(interp);
+ goto badIndex;
+ }
+ }
+ return TCL_OK;
+
+ badIndex:
+ Tcl_AppendResult(interp, "bad listbox index \"", string,
+ "\": must be active, anchor, end, @x,y, or a number",
+ (char *) NULL);
+ return TCL_ERROR;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ChangeListboxView --
+ *
+ * Change the view on a listbox widget so that a given element
+ * is displayed at the top.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * What's displayed on the screen is changed. If there is a
+ * scrollbar associated with this widget, then the scrollbar
+ * is instructed to change its display too.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+ChangeListboxView(listPtr, index)
+ register Listbox *listPtr; /* Information about widget. */
+ int index; /* Index of element in listPtr
+ * that should now appear at the
+ * top of the listbox. */
+{
+ if (index >= (listPtr->numElements - listPtr->fullLines)) {
+ index = listPtr->numElements - listPtr->fullLines;
+ }
+ if (index < 0) {
+ index = 0;
+ }
+ if (listPtr->topIndex != index) {
+ listPtr->topIndex = index;
+ if (!(listPtr->flags & REDRAW_PENDING)) {
+ Tcl_DoWhenIdle(DisplayListbox, (ClientData) listPtr);
+ listPtr->flags |= REDRAW_PENDING;
+ }
+ listPtr->flags |= UPDATE_V_SCROLLBAR;
+ }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ChangListboxOffset --
+ *
+ * Change the horizontal offset for a listbox.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * The listbox may be redrawn to reflect its new horizontal
+ * offset.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+ChangeListboxOffset(listPtr, offset)
+ register Listbox *listPtr; /* Information about widget. */
+ int offset; /* Desired new "xOffset" for
+ * listbox. */
+{
+ int maxOffset;
+
+ /*
+ * Make sure that the new offset is within the allowable range, and
+ * round it off to an even multiple of xScrollUnit.
+ */
+
+ maxOffset = listPtr->maxWidth - (Tk_Width(listPtr->tkwin) -
+ 2*listPtr->inset - 2*listPtr->selBorderWidth)
+ + listPtr->xScrollUnit - 1;
+ if (offset > maxOffset) {
+ offset = maxOffset;
+ }
+ if (offset < 0) {
+ offset = 0;
+ }
+ offset -= offset % listPtr->xScrollUnit;
+ if (offset != listPtr->xOffset) {
+ listPtr->xOffset = offset;
+ listPtr->flags |= UPDATE_H_SCROLLBAR;
+ ListboxRedrawRange(listPtr, 0, listPtr->numElements);
+ }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ListboxScanTo --
+ *
+ * Given a point (presumably of the curent mouse location)
+ * drag the view in the window to implement the scan operation.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * The view in the window may change.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+ListboxScanTo(listPtr, x, y)
+ register Listbox *listPtr; /* Information about widget. */
+ int x; /* X-coordinate to use for scan
+ * operation. */
+ int y; /* Y-coordinate to use for scan
+ * operation. */
+{
+ int newTopIndex, newOffset, maxIndex, maxOffset;
+
+ maxIndex = listPtr->numElements - listPtr->fullLines;
+ maxOffset = listPtr->maxWidth + (listPtr->xScrollUnit - 1)
+ - (Tk_Width(listPtr->tkwin) - 2*listPtr->inset
+ - 2*listPtr->selBorderWidth - listPtr->xScrollUnit);
+
+ /*
+ * Compute new top line for screen by amplifying the difference
+ * between the current position and the place where the scan
+ * started (the "mark" position). If we run off the top or bottom
+ * of the list, then reset the mark point so that the current
+ * position continues to correspond to the edge of the window.
+ * This means that the picture will start dragging as soon as the
+ * mouse reverses direction (without this reset, might have to slide
+ * mouse a long ways back before the picture starts moving again).
+ */
+
+ newTopIndex = listPtr->scanMarkYIndex
+ - (10*(y - listPtr->scanMarkY))/listPtr->lineHeight;
+ if (newTopIndex > maxIndex) {
+ newTopIndex = listPtr->scanMarkYIndex = maxIndex;
+ listPtr->scanMarkY = y;
+ } else if (newTopIndex < 0) {
+ newTopIndex = listPtr->scanMarkYIndex = 0;
+ listPtr->scanMarkY = y;
+ }
+ ChangeListboxView(listPtr, newTopIndex);
+
+ /*
+ * Compute new left edge for display in a similar fashion by amplifying
+ * the difference between the current position and the place where the
+ * scan started.
+ */
+
+ newOffset = listPtr->scanMarkXOffset - (10*(x - listPtr->scanMarkX));
+ if (newOffset > maxOffset) {
+ newOffset = listPtr->scanMarkXOffset = maxOffset;
+ listPtr->scanMarkX = x;
+ } else if (newOffset < 0) {
+ newOffset = listPtr->scanMarkXOffset = 0;
+ listPtr->scanMarkX = x;
+ }
+ ChangeListboxOffset(listPtr, newOffset);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * NearestListboxElement --
+ *
+ * Given a y-coordinate inside a listbox, compute the index of
+ * the element under that y-coordinate (or closest to that
+ * y-coordinate).
+ *
+ * Results:
+ * The return value is an index of an element of listPtr. If
+ * listPtr has no elements, then 0 is always returned.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+NearestListboxElement(listPtr, y)
+ register Listbox *listPtr; /* Information about widget. */
+ int y; /* Y-coordinate in listPtr's window. */
+{
+ int index;
+
+ index = (y - listPtr->inset)/listPtr->lineHeight;
+ if (index >= (listPtr->fullLines + listPtr->partialLine)) {
+ index = listPtr->fullLines + listPtr->partialLine - 1;
+ }
+ if (index < 0) {
+ index = 0;
+ }
+ index += listPtr->topIndex;
+ if (index >= listPtr->numElements) {
+ index = listPtr->numElements-1;
+ }
+ return index;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ListboxSelect --
+ *
+ * Select or deselect one or more elements in a listbox..
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * All of the elements in the range between first and last are
+ * marked as either selected or deselected, depending on the
+ * "select" argument. Any items whose state changes are redisplayed.
+ * The selection is claimed from X when the number of selected
+ * elements changes from zero to non-zero.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+ListboxSelect(listPtr, first, last, select)
+ register Listbox *listPtr; /* Information about widget. */
+ int first; /* Index of first element to
+ * select or deselect. */
+ int last; /* Index of last element to
+ * select or deselect. */
+ int select; /* 1 means select items, 0 means
+ * deselect them. */
+{
+ int i, firstRedisplay, increment, oldCount;
+ Element *elPtr;
+
+ if (last < first) {
+ i = first;
+ first = last;
+ last = i;
+ }
+ if ((last < 0) || (first >= listPtr->numElements)) {
+ return;
+ }
+ if (first < 0) {
+ first = 0;
+ }
+ if (last >= listPtr->numElements) {
+ last = listPtr->numElements - 1;
+ }
+ oldCount = listPtr->numSelected;
+ firstRedisplay = -1;
+ increment = select ? 1 : -1;
+ for (i = 0, elPtr = listPtr->firstPtr; i < first;
+ i++, elPtr = elPtr->nextPtr) {
+ /* Empty loop body. */
+ }
+ for ( ; i <= last; i++, elPtr = elPtr->nextPtr) {
+ if (elPtr->selected == select) {
+ continue;
+ }
+ listPtr->numSelected += increment;
+ elPtr->selected = select;
+ if (firstRedisplay < 0) {
+ firstRedisplay = i;
+ }
+ }
+ if (firstRedisplay >= 0) {
+ ListboxRedrawRange(listPtr, first, last);
+ }
+ if ((oldCount == 0) && (listPtr->numSelected > 0)
+ && (listPtr->exportSelection)) {
+ Tk_OwnSelection(listPtr->tkwin, XA_PRIMARY, ListboxLostSelection,
+ (ClientData) listPtr);
+ }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ListboxFetchSelection --
+ *
+ * This procedure is called back by Tk when the selection is
+ * requested by someone. It returns part or all of the selection
+ * in a buffer provided by the caller.
+ *
+ * Results:
+ * The return value is the number of non-NULL bytes stored
+ * at buffer. Buffer is filled (or partially filled) with a
+ * NULL-terminated string containing part or all of the selection,
+ * as given by offset and maxBytes. The selection is returned
+ * as a Tcl list with one list element for each element in the
+ * listbox.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+ListboxFetchSelection(clientData, offset, buffer, maxBytes)
+ ClientData clientData; /* Information about listbox widget. */
+ int offset; /* Offset within selection of first
+ * byte to be returned. */
+ char *buffer; /* Location in which to place
+ * selection. */
+ int maxBytes; /* Maximum number of bytes to place
+ * at buffer, not including terminating
+ * NULL character. */
+{
+ register Listbox *listPtr = (Listbox *) clientData;
+ register Element *elPtr;
+ Tcl_DString selection;
+ int length, count, needNewline;
+
+ if (!listPtr->exportSelection) {
+ return -1;
+ }
+
+ /*
+ * Use a dynamic string to accumulate the contents of the selection.
+ */
+
+ needNewline = 0;
+ Tcl_DStringInit(&selection);
+ for (elPtr = listPtr->firstPtr; elPtr != NULL; elPtr = elPtr->nextPtr) {
+ if (elPtr->selected) {
+ if (needNewline) {
+ Tcl_DStringAppend(&selection, "\n", 1);
+ }
+ Tcl_DStringAppend(&selection, elPtr->text, elPtr->textLength);
+ needNewline = 1;
+ }
+ }
+
+ length = Tcl_DStringLength(&selection);
+ if (length == 0) {
+ return -1;
+ }
+
+ /*
+ * Copy the requested portion of the selection to the buffer.
+ */
+
+ count = length - offset;
+ if (count <= 0) {
+ count = 0;
+ } else {
+ if (count > maxBytes) {
+ count = maxBytes;
+ }
+ memcpy((VOID *) buffer,
+ (VOID *) (Tcl_DStringValue(&selection) + offset),
+ (size_t) count);
+ }
+ buffer[count] = '\0';
+ Tcl_DStringFree(&selection);
+ return count;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ListboxLostSelection --
+ *
+ * This procedure is called back by Tk when the selection is
+ * grabbed away from a listbox widget.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * The existing selection is unhighlighted, and the window is
+ * marked as not containing a selection.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+ListboxLostSelection(clientData)
+ ClientData clientData; /* Information about listbox widget. */
+{
+ register Listbox *listPtr = (Listbox *) clientData;
+
+ if ((listPtr->exportSelection) && (listPtr->numElements > 0)) {
+ ListboxSelect(listPtr, 0, listPtr->numElements-1, 0);
+ }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ListboxRedrawRange --
+ *
+ * Ensure that a given range of elements is eventually redrawn on
+ * the display (if those elements in fact appear on the display).
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * Information gets redisplayed.
+ *
+ *----------------------------------------------------------------------
+ */
+
+ /* ARGSUSED */
+static void
+ListboxRedrawRange(listPtr, first, last)
+ register Listbox *listPtr; /* Information about widget. */
+ int first; /* Index of first element in list
+ * that needs to be redrawn. */
+ int last; /* Index of last element in list
+ * that needs to be redrawn. May
+ * be less than first;
+ * these just bracket a range. */
+{
+ if ((listPtr->tkwin == NULL) || !Tk_IsMapped(listPtr->tkwin)
+ || (listPtr->flags & REDRAW_PENDING)) {
+ return;
+ }
+ Tcl_DoWhenIdle(DisplayListbox, (ClientData) listPtr);
+ listPtr->flags |= REDRAW_PENDING;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ListboxUpdateVScrollbar --
+ *
+ * This procedure is invoked whenever information has changed in
+ * a listbox in a way that would invalidate a vertical scrollbar
+ * display. If there is an associated scrollbar, then this command
+ * updates it by invoking a Tcl command.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * A Tcl command is invoked, and an additional command may be
+ * invoked to process errors in the command.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+ListboxUpdateVScrollbar(listPtr)
+ register Listbox *listPtr; /* Information about widget. */
+{
+ char string[100];
+ double first, last;
+ int result;
+ Tcl_Interp *interp;
+
+ if (listPtr->yScrollCmd == NULL) {
+ return;
+ }
+ if (listPtr->numElements == 0) {
+ first = 0.0;
+ last = 1.0;
+ } else {
+ first = listPtr->topIndex/((double) listPtr->numElements);
+ last = (listPtr->topIndex+listPtr->fullLines)
+ /((double) listPtr->numElements);
+ if (last > 1.0) {
+ last = 1.0;
+ }
+ }
+ sprintf(string, " %g %g", first, last);
+
+ /*
+ * We must hold onto the interpreter from the listPtr because the data
+ * at listPtr might be freed as a result of the Tcl_VarEval.
+ */
+
+ interp = listPtr->interp;
+ Tcl_Preserve((ClientData) interp);
+ result = Tcl_VarEval(interp, listPtr->yScrollCmd, string,
+ (char *) NULL);
+ if (result != TCL_OK) {
+ Tcl_AddErrorInfo(interp,
+ "\n (vertical scrolling command executed by listbox)");
+ Tcl_BackgroundError(interp);
+ }
+ Tcl_Release((ClientData) interp);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * ListboxUpdateHScrollbar --
+ *
+ * This procedure is invoked whenever information has changed in
+ * a listbox in a way that would invalidate a horizontal scrollbar
+ * display. If there is an associated horizontal scrollbar, then
+ * this command updates it by invoking a Tcl command.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * A Tcl command is invoked, and an additional command may be
+ * invoked to process errors in the command.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static void
+ListboxUpdateHScrollbar(listPtr)
+ register Listbox *listPtr; /* Information about widget. */
+{
+ char string[60];
+ int result, windowWidth;
+ double first, last;
+ Tcl_Interp *interp;
+
+ if (listPtr->xScrollCmd == NULL) {
+ return;
+ }
+ windowWidth = Tk_Width(listPtr->tkwin) - 2*(listPtr->inset
+ + listPtr->selBorderWidth);
+ if (listPtr->maxWidth == 0) {
+ first = 0;
+ last = 1.0;
+ } else {
+ first = listPtr->xOffset/((double) listPtr->maxWidth);
+ last = (listPtr->xOffset + windowWidth)
+ /((double) listPtr->maxWidth);
+ if (last > 1.0) {
+ last = 1.0;
+ }
+ }
+ sprintf(string, " %g %g", first, last);
+
+ /*
+ * We must hold onto the interpreter because the data referred to at
+ * listPtr might be freed as a result of the call to Tcl_VarEval.
+ */
+
+ interp = listPtr->interp;
+ Tcl_Preserve((ClientData) interp);
+ result = Tcl_VarEval(interp, listPtr->xScrollCmd, string,
+ (char *) NULL);
+ if (result != TCL_OK) {
+ Tcl_AddErrorInfo(interp,
+ "\n (horizontal scrolling command executed by listbox)");
+ Tcl_BackgroundError(interp);
+ }
+ Tcl_Release((ClientData) interp);
+}