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ckBind.c
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/*
* ckBind.c --
*
* This file provides procedures that associate Tcl commands
* with events or sequences of events.
*
* Copyright (c) 1989-1994 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"
/*
* The structure below represents a binding table. A binding table
* represents a domain in which event bindings may occur. It includes
* a space of objects relative to which events occur (usually windows,
* but not always), a history of recent events in the domain, and
* a set of mappings that associate particular Tcl commands with sequences
* of events in the domain. Multiple binding tables may exist at once,
* either because there are multiple applications open, or because there
* are multiple domains within an application with separate event
* bindings for each (for example, each canvas widget has a separate
* binding table for associating events with the items in the canvas).
*
* Note: it is probably a bad idea to reduce EVENT_BUFFER_SIZE much
* below 30. To see this, consider a triple mouse button click while
* the Shift key is down (and auto-repeating). There may be as many
* as 3 auto-repeat events after each mouse button press or release
* (see the first large comment block within Ck_BindEvent for more on
* this), for a total of 20 events to cover the three button presses
* and two intervening releases. If you reduce EVENT_BUFFER_SIZE too
* much, shift multi-clicks will be lost.
*
*/
#define EVENT_BUFFER_SIZE 30
typedef struct BindingTable {
CkEvent eventRing[EVENT_BUFFER_SIZE];/* Circular queue of recent events
* (higher indices are for more recent
* events). */
int detailRing[EVENT_BUFFER_SIZE]; /* "Detail" information (keycodes for
* each entry in eventRing. */
int curEvent; /* Index in eventRing of most recent
* event. Newer events have higher
* indices. */
Tcl_HashTable patternTable; /* Used to map from an event to a list
* of patterns that may match that
* event. Keys are PatternTableKey
* structs, values are (PatSeq *). */
Tcl_HashTable objectTable; /* Used to map from an object to a list
* of patterns associated with that
* object. Keys are ClientData,
* values are (PatSeq *). */
Tcl_Interp *interp; /* Interpreter in which commands are
* executed. */
} BindingTable;
/*
* Structures of the following form are used as keys in the patternTable
* for a binding table:
*/
typedef struct PatternTableKey {
ClientData object; /* Identifies object (or class of objects)
* relative to which event occurred. For
* example, in the widget binding table for
* an application this is the path name of
* a widget, or a widget class, or "all". */
int type; /* Type of event. */
int detail; /* Additional information, such as
* keycode, or 0 if nothing
* additional.*/
} PatternTableKey;
/*
* The following structure defines a pattern, which is matched
* against events as part of the process of converting events
* into Tcl commands.
*/
typedef struct Pattern {
int eventType; /* Type of event. */
int detail; /* Additional information that must
* match event. Normally this is 0,
* meaning no additional information
* must match. For keystrokes this
* is the keycode. Keycode 0 means
* any keystroke, keycode -1 means
* control keystroke. */
} Pattern;
/*
* The structure below defines a pattern sequence, which consists
* of one or more patterns. In order to trigger, a pattern
* sequence must match the most recent X events (first pattern
* to most recent event, next pattern to next event, and so on).
*/
typedef struct PatSeq {
int numPats; /* Number of patterns in sequence
* (usually 1). */
char *command; /* Command to invoke when this
* pattern sequence matches (malloc-ed). */
struct PatSeq *nextSeqPtr;
/* Next in list of all pattern
* sequences that have the same
* initial pattern. NULL means
* end of list. */
Tcl_HashEntry *hPtr; /* Pointer to hash table entry for
* the initial pattern. This is the
* head of the list of which nextSeqPtr
* forms a part. */
ClientData object; /* Identifies object with which event is
* associated (e.g. window). */
struct PatSeq *nextObjPtr;
/* Next in list of all pattern
* sequences for the same object
* (NULL for end of list). Needed to
* implement Tk_DeleteAllBindings. */
Pattern pats[1]; /* Array of "numPats" patterns. Only
* one element is declared here but
* in actuality enough space will be
* allocated for "numPats" patterns.
* To match, pats[0] must match event
* n, pats[1] must match event n-1,
* etc. */
} PatSeq;
typedef struct {
char *name; /* Name of keysym. */
KeySym value; /* Numeric identifier for keysym. */
char *tiname; /* Terminfo name of keysym. */
} KeySymInfo;
static KeySymInfo keyArray[] = {
#include "ks_names.h"
{(char *) NULL, 0}
};
static Tcl_HashTable keySymTable; /* Hashed form of above structure. */
static Tcl_HashTable revKeySymTable; /* Ditto, reversed. */
static int initialized = 0;
/*
* This module also keeps a hash table mapping from event names
* to information about those events. The structure, an array
* to use to initialize the hash table, and the hash table are
* all defined below.
*/
typedef struct {
char *name; /* Name of event. */
int type; /* Event type for X, such as
* ButtonPress. */
int eventMask; /* Mask bits for this event type. */
} EventInfo;
static EventInfo eventArray[] = {
{"Expose", CK_EV_EXPOSE, CK_EV_EXPOSE},
{"FocusIn", CK_EV_FOCUSIN, CK_EV_FOCUSIN},
{"FocusOut", CK_EV_FOCUSOUT, CK_EV_FOCUSOUT},
{"Key", CK_EV_KEYPRESS, CK_EV_KEYPRESS},
{"KeyPress", CK_EV_KEYPRESS, CK_EV_KEYPRESS},
{"Control", CK_EV_KEYPRESS, CK_EV_KEYPRESS},
{"Destroy", CK_EV_DESTROY, CK_EV_DESTROY},
{"Map", CK_EV_MAP, CK_EV_MAP},
{"Unmap", CK_EV_UNMAP, CK_EV_UNMAP},
{"Button", CK_EV_MOUSE_DOWN, CK_EV_MOUSE_DOWN},
{"ButtonPress", CK_EV_MOUSE_DOWN, CK_EV_MOUSE_DOWN},
{"ButtonRelease", CK_EV_MOUSE_UP, CK_EV_MOUSE_UP},
{"BarCode", CK_EV_BARCODE, CK_EV_BARCODE},
{(char *) NULL, 0, 0}
};
static Tcl_HashTable eventTable;
/*
* Prototypes for local procedures defined in this file:
*/
static void ExpandPercents _ANSI_ARGS_((CkWindow *winPtr,
char *before, CkEvent *eventPtr, KeySym keySym,
Tcl_DString *dsPtr));
static PatSeq * FindSequence _ANSI_ARGS_((Tcl_Interp *interp,
BindingTable *bindPtr, ClientData object,
char *eventString, int create));
static char * GetField _ANSI_ARGS_((char *p, char *copy, int size));
static PatSeq * MatchPatterns _ANSI_ARGS_((BindingTable *bindPtr,
PatSeq *psPtr));
/*
*--------------------------------------------------------------
*
* Ck_CreateBindingTable --
*
* Set up a new domain in which event bindings may be created.
*
* Results:
* The return value is a token for the new table, which must
* be passed to procedures like Ck_CreateBinding.
*
* Side effects:
* Memory is allocated for the new table.
*
*--------------------------------------------------------------
*/
Ck_BindingTable
Ck_CreateBindingTable(interp)
Tcl_Interp *interp; /* Interpreter to associate with the binding
* table: commands are executed in this
* interpreter. */
{
BindingTable *bindPtr;
int i;
/*
* If this is the first time a binding table has been created,
* initialize the global data structures.
*/
if (!initialized) {
Tcl_HashEntry *hPtr;
EventInfo *eiPtr;
KeySymInfo *kPtr;
int dummy;
Tcl_InitHashTable(&keySymTable, TCL_STRING_KEYS);
Tcl_InitHashTable(&revKeySymTable, TCL_ONE_WORD_KEYS);
for (kPtr = keyArray; kPtr->name != NULL; kPtr++) {
hPtr = Tcl_CreateHashEntry(&keySymTable, kPtr->name, &dummy);
Tcl_SetHashValue(hPtr, (char *) kPtr);
hPtr = Tcl_CreateHashEntry(&revKeySymTable, (char *) kPtr->value,
&dummy);
Tcl_SetHashValue(hPtr, (char *) kPtr);
}
Tcl_InitHashTable(&eventTable, TCL_STRING_KEYS);
for (eiPtr = eventArray; eiPtr->name != NULL; eiPtr++) {
hPtr = Tcl_CreateHashEntry(&eventTable, eiPtr->name, &dummy);
Tcl_SetHashValue(hPtr, eiPtr);
}
initialized = 1;
}
/*
* Create and initialize a new binding table.
*/
bindPtr = (BindingTable *) ckalloc(sizeof (BindingTable));
for (i = 0; i < EVENT_BUFFER_SIZE; i++) {
bindPtr->eventRing[i].type = -1;
}
bindPtr->curEvent = 0;
Tcl_InitHashTable(&bindPtr->patternTable,
sizeof(PatternTableKey)/sizeof(int));
Tcl_InitHashTable(&bindPtr->objectTable, TCL_ONE_WORD_KEYS);
bindPtr->interp = interp;
return (Ck_BindingTable) bindPtr;
}
/*
*--------------------------------------------------------------
*
* Ck_DeleteBindingTable --
*
* Destroy a binding table and free up all its memory.
* The caller should not use bindingTable again after
* this procedure returns.
*
* Results:
* None.
*
* Side effects:
* Memory is freed.
*
*--------------------------------------------------------------
*/
void
Ck_DeleteBindingTable(bindingTable)
Ck_BindingTable bindingTable; /* Token for the binding table to
* destroy. */
{
BindingTable *bindPtr = (BindingTable *) bindingTable;
PatSeq *psPtr, *nextPtr;
Tcl_HashEntry *hPtr;
Tcl_HashSearch search;
/*
* Find and delete all of the patterns associated with the binding
* table.
*/
for (hPtr = Tcl_FirstHashEntry(&bindPtr->patternTable, &search);
hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
for (psPtr = (PatSeq *) Tcl_GetHashValue(hPtr);
psPtr != NULL; psPtr = nextPtr) {
nextPtr = psPtr->nextSeqPtr;
ckfree((char *) psPtr->command);
ckfree((char *) psPtr);
}
}
/*
* Clean up the rest of the information associated with the
* binding table.
*/
Tcl_DeleteHashTable(&bindPtr->patternTable);
Tcl_DeleteHashTable(&bindPtr->objectTable);
ckfree((char *) bindPtr);
}
/*
*--------------------------------------------------------------
*
* Ck_CreateBinding --
*
* Add a binding to a binding table, so that future calls to
* Ck_BindEvent may execute the command in the binding.
*
* Results:
* The return value is TCL_ERROR if an error occurred while setting
* up the binding. In this case, an error message will be
* left in interp->result. If all went well then the return
* value is TCL_OK.
*
* Side effects:
* The new binding may cause future calls to Ck_BindEvent to
* behave differently than they did previously.
*
*--------------------------------------------------------------
*/
int
Ck_CreateBinding(interp, bindingTable, object, eventString, command, append)
Tcl_Interp *interp; /* Used for error reporting. */
Ck_BindingTable bindingTable; /* Table in which to create binding. */
ClientData object; /* Token for object with which binding
* is associated. */
char *eventString; /* String describing event sequence
* that triggers binding. */
char *command; /* Contains Tcl command to execute
* when binding triggers. */
int append; /* 0 means replace any existing
* binding for eventString; 1 means
* append to that binding. */
{
BindingTable *bindPtr = (BindingTable *) bindingTable;
PatSeq *psPtr;
psPtr = FindSequence(interp, bindPtr, object, eventString, 1);
if (psPtr == NULL)
return TCL_ERROR;
if (append && (psPtr->command != NULL)) {
int length;
char *new;
length = strlen(psPtr->command) + strlen(command) + 2;
new = (char *) ckalloc((unsigned) length);
sprintf(new, "%s\n%s", psPtr->command, command);
ckfree((char *) psPtr->command);
psPtr->command = new;
} else {
if (psPtr->command != NULL) {
ckfree((char *) psPtr->command);
}
psPtr->command = (char *) ckalloc((unsigned) (strlen(command) + 1));
strcpy(psPtr->command, command);
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* Ck_DeleteBinding --
*
* Remove an event binding from a binding table.
*
* Results:
* The result is a standard Tcl return value. If an error
* occurs then interp->result will contain an error message.
*
* Side effects:
* The binding given by object and eventString is removed
* from bindingTable.
*
*--------------------------------------------------------------
*/
int
Ck_DeleteBinding(interp, bindingTable, object, eventString)
Tcl_Interp *interp; /* Used for error reporting. */
Ck_BindingTable bindingTable; /* Table in which to delete binding. */
ClientData object; /* Token for object with which binding
* is associated. */
char *eventString; /* String describing event sequence
* that triggers binding. */
{
BindingTable *bindPtr = (BindingTable *) bindingTable;
register PatSeq *psPtr, *prevPtr;
Tcl_HashEntry *hPtr;
psPtr = FindSequence(interp, bindPtr, object, eventString, 0);
if (psPtr == NULL) {
Tcl_ResetResult(interp);
return TCL_OK;
}
/*
* Unlink the binding from the list for its object, then from the
* list for its pattern.
*/
hPtr = Tcl_FindHashEntry(&bindPtr->objectTable, (char *) object);
if (hPtr == NULL) {
panic("Ck_DeleteBinding couldn't find object table entry");
}
prevPtr = (PatSeq *) Tcl_GetHashValue(hPtr);
if (prevPtr == psPtr) {
Tcl_SetHashValue(hPtr, psPtr->nextObjPtr);
} else {
for ( ; ; prevPtr = prevPtr->nextObjPtr) {
if (prevPtr == NULL) {
panic("Ck_DeleteBinding couldn't find on object list");
}
if (prevPtr->nextObjPtr == psPtr) {
prevPtr->nextObjPtr = psPtr->nextObjPtr;
break;
}
}
}
prevPtr = (PatSeq *) Tcl_GetHashValue(psPtr->hPtr);
if (prevPtr == psPtr) {
if (psPtr->nextSeqPtr == NULL) {
Tcl_DeleteHashEntry(psPtr->hPtr);
} else {
Tcl_SetHashValue(psPtr->hPtr, psPtr->nextSeqPtr);
}
} else {
for ( ; ; prevPtr = prevPtr->nextSeqPtr) {
if (prevPtr == NULL) {
panic("Tk_DeleteBinding couldn't find on hash chain");
}
if (prevPtr->nextSeqPtr == psPtr) {
prevPtr->nextSeqPtr = psPtr->nextSeqPtr;
break;
}
}
}
ckfree((char *) psPtr->command);
ckfree((char *) psPtr);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* Ck_GetBinding --
*
* Return the command associated with a given event string.
*
* Results:
* The return value is a pointer to the command string
* associated with eventString for object in the domain
* given by bindingTable. If there is no binding for
* eventString, or if eventString is improperly formed,
* then NULL is returned and an error message is left in
* interp->result. The return value is semi-static: it
* will persist until the binding is changed or deleted.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
char *
Ck_GetBinding(interp, bindingTable, object, eventString)
Tcl_Interp *interp; /* Interpreter for error reporting. */
Ck_BindingTable bindingTable; /* Table in which to look for
* binding. */
ClientData object; /* Token for object with which binding
* is associated. */
char *eventString; /* String describing event sequence
* that triggers binding. */
{
BindingTable *bindPtr = (BindingTable *) bindingTable;
PatSeq *psPtr;
psPtr = FindSequence(interp, bindPtr, object, eventString, 0);
if (psPtr == NULL) {
return NULL;
}
return psPtr->command;
}
/*
*--------------------------------------------------------------
*
* Ck_GetAllBindings --
*
* Return a list of event strings for all the bindings
* associated with a given object.
*
* Results:
* There is no return value. Interp->result is modified to
* hold a Tcl list with one entry for each binding associated
* with object in bindingTable. Each entry in the list
* contains the event string associated with one binding.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
void
Ck_GetAllBindings(interp, bindingTable, object)
Tcl_Interp *interp; /* Interpreter returning result or
* error. */
Ck_BindingTable bindingTable; /* Table in which to look for
* bindings. */
ClientData object; /* Token for object. */
{
BindingTable *bindPtr = (BindingTable *) bindingTable;
register PatSeq *psPtr;
register Pattern *patPtr;
Tcl_HashEntry *hPtr;
Tcl_DString ds;
char c, buffer[10];
int patsLeft;
register EventInfo *eiPtr;
hPtr = Tcl_FindHashEntry(&bindPtr->objectTable, (char *) object);
if (hPtr == NULL) {
return;
}
Tcl_DStringInit(&ds);
for (psPtr = (PatSeq *) Tcl_GetHashValue(hPtr); psPtr != NULL;
psPtr = psPtr->nextObjPtr) {
Tcl_DStringTrunc(&ds, 0);
/*
* For each binding, output information about each of the
* patterns in its sequence. The order of the patterns in
* the sequence is backwards from the order in which they
* must be output.
*/
for (patsLeft = psPtr->numPats,
patPtr = &psPtr->pats[psPtr->numPats - 1];
patsLeft > 0; patsLeft--, patPtr--) {
/*
* Check for button presses.
*/
if ((patPtr->eventType == CK_EV_MOUSE_DOWN)
&& (patPtr->detail != 0)) {
sprintf(buffer, "<%d>", patPtr->detail);
Tcl_DStringAppend(&ds, buffer, -1);
continue;
}
/*
* Check for simple case of an ASCII character.
*/
if ((patPtr->eventType == CK_EV_KEYPRESS)
&& (patPtr->detail < 128)
&& isprint((unsigned char) patPtr->detail)
&& (patPtr->detail != '<')
&& (patPtr->detail != ' ')) {
c = patPtr->detail;
Tcl_DStringAppend(&ds, &c, 1);
continue;
}
/*
* It's a more general event specification. First check
* event type, then keysym or button detail.
*/
Tcl_DStringAppend(&ds, "<", 1);
for (eiPtr = eventArray; eiPtr->name != NULL; eiPtr++) {
if (eiPtr->type == patPtr->eventType) {
if (patPtr->eventType == CK_EV_KEYPRESS &&
patPtr->detail == -1) {
Tcl_DStringAppend(&ds, "Control", -1);
goto endPat;
}
if (patPtr->eventType == CK_EV_KEYPRESS &&
patPtr->detail > 0 && patPtr->detail < 0x20) {
char *string;
string = CkKeysymToString((KeySym) patPtr->detail, 0);
if (string == NULL) {
sprintf(buffer, "Control-%c",
patPtr->detail + 0x40);
string = buffer;
}
Tcl_DStringAppend(&ds, string, -1);
goto endPat;
}
Tcl_DStringAppend(&ds, eiPtr->name, -1);
if (patPtr->detail != 0) {
Tcl_DStringAppend(&ds, "-", 1);
}
break;
}
}
if (patPtr->detail != 0) {
if (patPtr->eventType == CK_EV_KEYPRESS) {
char *string;
string = CkKeysymToString((KeySym) patPtr->detail, 0);
if (string != NULL) {
Tcl_DStringAppend(&ds, string, -1);
}
} else {
sprintf(buffer, "%d", patPtr->detail);
Tcl_DStringAppend(&ds, buffer, -1);
}
}
endPat:
Tcl_DStringAppend(&ds, ">", 1);
}
Tcl_AppendElement(interp, Tcl_DStringValue(&ds));
}
Tcl_DStringFree(&ds);
}
/*
*--------------------------------------------------------------
*
* Ck_DeleteAllBindings --
*
* Remove all bindings associated with a given object in a
* given binding table.
*
* Results:
* All bindings associated with object are removed from
* bindingTable.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
void
Ck_DeleteAllBindings(bindingTable, object)
Ck_BindingTable bindingTable; /* Table in which to delete
* bindings. */
ClientData object; /* Token for object. */
{
BindingTable *bindPtr = (BindingTable *) bindingTable;
PatSeq *psPtr, *prevPtr;
PatSeq *nextPtr;
Tcl_HashEntry *hPtr;
hPtr = Tcl_FindHashEntry(&bindPtr->objectTable, (char *) object);
if (hPtr == NULL) {
return;
}
for (psPtr = (PatSeq *) Tcl_GetHashValue(hPtr); psPtr != NULL;
psPtr = nextPtr) {
nextPtr = psPtr->nextObjPtr;
/*
* Be sure to remove each binding from its hash chain in the
* pattern table. If this is the last pattern in the chain,
* then delete the hash entry too.
*/
prevPtr = (PatSeq *) Tcl_GetHashValue(psPtr->hPtr);
if (prevPtr == psPtr) {
if (psPtr->nextSeqPtr == NULL) {
Tcl_DeleteHashEntry(psPtr->hPtr);
} else {
Tcl_SetHashValue(psPtr->hPtr, psPtr->nextSeqPtr);
}
} else {
for ( ; ; prevPtr = prevPtr->nextSeqPtr) {
if (prevPtr == NULL) {
panic("Ck_DeleteAllBindings couldn't find on hash chain");
}
if (prevPtr->nextSeqPtr == psPtr) {
prevPtr->nextSeqPtr = psPtr->nextSeqPtr;
break;
}
}
}
ckfree((char *) psPtr->command);
ckfree((char *) psPtr);
}
Tcl_DeleteHashEntry(hPtr);
}
/*
*--------------------------------------------------------------
*
* Ck_BindEvent --
*
* This procedure is invoked to process an event. The
* event is added to those recorded for the binding table.
* Then each of the objects at *objectPtr is checked in
* order to see if it has a binding that matches the recent
* events. If so, that binding is invoked and the rest of
* objects are skipped.
*
* Results:
* None.
*
* Side effects:
* Depends on the command associated with the matching
* binding.
*
*--------------------------------------------------------------
*/
void
Ck_BindEvent(bindingTable, eventPtr, winPtr, numObjects, objectPtr)
Ck_BindingTable bindingTable; /* Table in which to look for
* bindings. */
CkEvent *eventPtr; /* What actually happened. */
CkWindow *winPtr; /* Window where event occurred. */
int numObjects; /* Number of objects at *objectPtr. */
ClientData *objectPtr; /* Array of one or more objects
* to check for a matching binding. */
{
BindingTable *bindPtr = (BindingTable *) bindingTable;
CkMainInfo *mainPtr;
CkEvent *ringPtr;
PatSeq *matchPtr;
PatternTableKey key;
Tcl_HashEntry *hPtr;
int detail, code;
Tcl_Interp *interp;
Tcl_DString scripts, savedResult;
char *p, *end;
/*
* Add the new event to the ring of saved events for the
* binding table.
*/
bindPtr->curEvent++;
if (bindPtr->curEvent >= EVENT_BUFFER_SIZE)
bindPtr->curEvent = 0;
ringPtr = &bindPtr->eventRing[bindPtr->curEvent];
memcpy((VOID *) ringPtr, (VOID *) eventPtr, sizeof (CkEvent));
detail = 0;
bindPtr->detailRing[bindPtr->curEvent] = 0;
if (ringPtr->type == CK_EV_KEYPRESS)
detail = ringPtr->key.keycode;
else if (ringPtr->type == CK_EV_MOUSE_DOWN ||
ringPtr->type == CK_EV_MOUSE_UP)
detail = ringPtr->mouse.button;
bindPtr->detailRing[bindPtr->curEvent] = detail;
/*
* Loop over all the objects, finding the binding script for each
* one. Append all of the binding scripts, with %-sequences expanded,
* to "scripts", with null characters separating the scripts for
* each object.
*/
Tcl_DStringInit(&scripts);
for ( ; numObjects > 0; numObjects--, objectPtr++) {
/*
* Match the new event against those recorded in the
* pattern table, saving the longest matching pattern.
* For events with details (key events) first
* look for a binding for the specific key or button.
* If none is found, then look for a binding for all
* control-keys (detail of -1, if the keycode is a control
* character), else look for a binding for all keys
* (detail of 0).
*/
matchPtr = NULL;
key.object = *objectPtr;
key.type = ringPtr->type;
key.detail = detail;
hPtr = Tcl_FindHashEntry(&bindPtr->patternTable, (char *) &key);
if (hPtr != NULL) {
matchPtr = MatchPatterns(bindPtr,
(PatSeq *) Tcl_GetHashValue(hPtr));
}
if (ringPtr->type == CK_EV_KEYPRESS && detail > 0 && detail < 0x20 &&
matchPtr == NULL) {
key.detail = -1;
hPtr = Tcl_FindHashEntry(&bindPtr->patternTable, (char *) &key);
if (hPtr != NULL) {
matchPtr = MatchPatterns(bindPtr,
(PatSeq *) Tcl_GetHashValue(hPtr));
}
}
if (detail != 0 && matchPtr == NULL) {
key.detail = 0;
hPtr = Tcl_FindHashEntry(&bindPtr->patternTable, (char *) &key);
if (hPtr != NULL) {
matchPtr = MatchPatterns(bindPtr,
(PatSeq *) Tcl_GetHashValue(hPtr));
}
}
if (matchPtr != NULL) {
ExpandPercents(winPtr, matchPtr->command, eventPtr,
(KeySym) detail, &scripts);
Tcl_DStringAppend(&scripts, "", 1);
}
}
/*
* Now go back through and evaluate the script for each object,
* in order, dealing with "break" and "continue" exceptions
* appropriately.
*
* There are two tricks here:
* 1. Bindings can be invoked from in the middle of Tcl commands,
* where interp->result is significant (for example, a widget
* might be deleted because of an error in creating it, so the
* result contains an error message that is eventually going to
* be returned by the creating command). To preserve the result,
* we save it in a dynamic string.
* 2. The binding's action can potentially delete the binding,
* so bindPtr may not point to anything valid once the action
* completes. Thus we have to save bindPtr->interp in a
* local variable in order to restore the result.
* 3. When the screen changes, must invoke a Tcl script to update
* Tcl level information such as tkPriv.
*/
mainPtr = winPtr->mainPtr;
interp = bindPtr->interp;
Tcl_DStringInit(&savedResult);
Tcl_DStringGetResult(interp, &savedResult);
p = Tcl_DStringValue(&scripts);
end = p + Tcl_DStringLength(&scripts);
while (p != end) {
Tcl_AllowExceptions(interp);
code = Tcl_GlobalEval(interp, p);
if (code != TCL_OK) {
if (code == TCL_CONTINUE) {
/*
* Do nothing: just go on to the next script.
*/
} else if (code == TCL_BREAK) {
break;
} else {
Tcl_AddErrorInfo(interp, "\n (command bound to event)");
Tk_BackgroundError(interp);
break;
}
}
/*
* Skip over the current script and its terminating null character.
*/
while (*p != 0) {
p++;
}
p++;
}
Tcl_DStringResult(interp, &savedResult);
Tcl_DStringFree(&scripts);
}
/*
*----------------------------------------------------------------------
*
* FindSequence --
*
* Find the entry in a binding table that corresponds to a
* particular pattern string, and return a pointer to that
* entry.
*
* Results:
* The return value is normally a pointer to the PatSeq
* in patternTable that corresponds to eventString. If an error
* was found while parsing eventString, or if "create" is 0 and
* no pattern sequence previously existed, then NULL is returned
* and interp->result contains a message describing the problem.
* If no pattern sequence previously existed for eventString, then
* a new one is created with a NULL command field. In a successful
* return, *maskPtr is filled in with a mask of the event types
* on which the pattern sequence depends.
*
* Side effects:
* A new pattern sequence may be created.
*
*----------------------------------------------------------------------
*/
static PatSeq *
FindSequence(interp, bindPtr, object, eventString, create)
Tcl_Interp *interp; /* Interpreter to use for error
* reporting. */
BindingTable *bindPtr; /* Table to use for lookup. */
ClientData object; /* Token for object(s) with which binding
* is associated. */
char *eventString; /* String description of pattern to
* match on. See user documentation
* for details. */
int create; /* 0 means don't create the entry if
* it doesn't already exist. Non-zero
* means create. */
{
Pattern pats[EVENT_BUFFER_SIZE];
int numPats, isCtrl;
register char *p;
register Pattern *patPtr;
register PatSeq *psPtr;
register Tcl_HashEntry *hPtr;
#define FIELD_SIZE 48
char field[FIELD_SIZE];
int new;
size_t sequenceSize;
unsigned long eventMask;
PatternTableKey key;
/*
*-------------------------------------------------------------
* Step 1: parse the pattern string to produce an array
* of Patterns. The array is generated backwards, so
* that the lowest-indexed pattern corresponds to the last
* event that must occur.
*-------------------------------------------------------------
*/
p = eventString;
eventMask = 0;
for (numPats = 0, patPtr = &pats[EVENT_BUFFER_SIZE-1];
numPats < EVENT_BUFFER_SIZE;
numPats++, patPtr--) {
patPtr->eventType = -1;
patPtr->detail = 0;
while (isspace((unsigned char) *p)) {
p++;
}
if (*p == '\0') {
break;
}
/*
* Handle simple ASCII characters.
*/
if (*p != '<') {
char string[2];
patPtr->eventType = CK_EV_KEYPRESS;
string[0] = *p;
string[1] = 0;
patPtr->detail = CkStringToKeysym(string);
if (patPtr->detail == NoSymbol) {
if (isprint((unsigned char) *p)) {
patPtr->detail = *p;
} else {
char resultbuf[64];
snprintf(resultbuf, sizeof(resultbuf),
"bad ASCII character 0x%x", (unsigned char) *p);
Tcl_SetResult(interp, resultbuf, TCL_VOLATILE);
return NULL;
}
}
p++;
continue;
}
p++;
/*
* Abbrevated button press event.
*/
if (isdigit((unsigned char) *p) && p[1] == '>') {
register EventInfo *eiPtr;
hPtr = Tcl_FindHashEntry(&eventTable, "ButtonPress");
eiPtr = (EventInfo *) Tcl_GetHashValue(hPtr);
patPtr->eventType = eiPtr->type;
eventMask |= eiPtr->eventMask;
patPtr->detail = *p - '0';
p += 2;
continue;