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/*
* tkSelect.h --
*
* Declarations of types shared among the files that implement selection
* support.
*
* Copyright (c) 1995 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#ifndef _TKSELECT
#define _TKSELECT
/*
* When a selection is owned by a window on a given display, one of the
* following structures is present on a list of current selections in the
* display structure. The structure is used to record the current owner of a
* selection for use in later retrieval requests. There is a list of such
* structures because a display can have multiple different selections active
* at the same time.
*/
typedef struct TkSelectionInfo {
Atom selection; /* Selection name, e.g. XA_PRIMARY. */
Tk_Window owner; /* Current owner of this selection. */
int serial; /* Serial number of last XSelectionSetOwner
* request made to server for this selection
* (used to filter out redundant
* SelectionClear events). */
Time time; /* Timestamp used to acquire selection. */
Tk_LostSelProc *clearProc; /* Procedure to call when owner loses
* selection. */
ClientData clearData; /* Info to pass to clearProc. */
struct TkSelectionInfo *nextPtr;
/* Next in list of current selections on this
* display. NULL means end of list. */
} TkSelectionInfo;
/*
* One of the following structures exists for each selection handler created
* for a window by calling Tk_CreateSelHandler. The handlers are linked in a
* list rooted in the TkWindow structure.
*/
typedef struct TkSelHandler {
Atom selection; /* Selection name, e.g. XA_PRIMARY. */
Atom target; /* Target type for selection conversion, such
* as TARGETS or STRING. */
Atom format; /* Format in which selection info will be
* returned, such as STRING or ATOM. */
Tk_SelectionProc *proc; /* Procedure to generate selection in this
* format. */
ClientData clientData; /* Argument to pass to proc. */
int size; /* Size of units returned by proc (8 for
* STRING, 32 for almost anything else). */
struct TkSelHandler *nextPtr;
/* Next selection handler associated with same
* window (NULL for end of list). */
} TkSelHandler;
/*
* When the selection is being retrieved, one of the following structures is
* present on a list of pending selection retrievals. The structure is used to
* communicate between the background procedure that requests the selection
* and the foreground event handler that processes the events in which the
* selection is returned. There is a list of such structures so that there can
* be multiple simultaneous selection retrievals (e.g. on different displays).
*/
typedef struct TkSelRetrievalInfo {
Tcl_Interp *interp; /* Interpreter for error reporting. */
TkWindow *winPtr; /* Window used as requestor for selection. */
Atom selection; /* Selection being requested. */
Atom property; /* Property where selection will appear. */
Atom target; /* Desired form for selection. */
Tk_GetSelProc *proc; /* Procedure to call to handle pieces of
* selection. */
ClientData clientData; /* Argument for proc. */
int result; /* Initially -1. Set to a Tcl return value
* once the selection has been retrieved. */
Tcl_TimerToken timeout; /* Token for current timeout procedure. */
int idleTime; /* Number of seconds that have gone by without
* hearing anything from the selection
* owner. */
Tcl_EncodingState encState; /* Holds intermediate state during translations
* of data that cross buffer boundaries. */
int encFlags; /* Encoding translation state flags. */
Tcl_DString buf; /* Buffer to hold translation data. */
struct TkSelRetrievalInfo *nextPtr;
/* Next in list of all pending selection
* retrievals. NULL means end of list. */
} TkSelRetrievalInfo;
/*
* The clipboard contains a list of buffers of various types and formats. All
* of the buffers of a given type will be returned in sequence when the
* CLIPBOARD selection is retrieved. All buffers of a given type on the same
* clipboard must have the same format. The TkClipboardTarget structure is
* used to record the information about a chain of buffers of the same type.
*/
typedef struct TkClipboardBuffer {
char *buffer; /* Null terminated data buffer. */
long length; /* Length of string in buffer. */
struct TkClipboardBuffer *nextPtr;
/* Next in list of buffers. NULL means end of
* list . */
} TkClipboardBuffer;
typedef struct TkClipboardTarget {
Atom type; /* Type conversion supported. */
Atom format; /* Representation used for data. */
TkClipboardBuffer *firstBufferPtr;
/* First in list of data buffers. */
TkClipboardBuffer *lastBufferPtr;
/* Last in list of clipboard buffers. Used to
* speed up appends. */
struct TkClipboardTarget *nextPtr;
/* Next in list of targets on clipboard. NULL
* means end of list. */
} TkClipboardTarget;
/*
* It is possible for a Tk_SelectionProc to delete the handler that it
* represents. If this happens, the code that is retrieving the selection
* needs to know about it so it doesn't use the now-defunct handler structure.
* One structure of the following form is created for each retrieval in
* progress, so that the retriever can find out if its handler is deleted. All
* of the pending retrievals (if there are more than one) are linked into a
* list.
*/
typedef struct TkSelInProgress {
TkSelHandler *selPtr; /* Handler being executed. If this handler is
* deleted, the field is set to NULL. */
struct TkSelInProgress *nextPtr;
/* Next higher nested search. */
} TkSelInProgress;
/*
* Chunk size for retrieving selection. It's defined both in words and in
* bytes; the word size is used to allocate buffer space that's guaranteed to
* be word-aligned and that has an extra character for the terminating NULL.
*/
#define TK_SEL_BYTES_AT_ONCE 4000
#define TK_SEL_WORDS_AT_ONCE 1001
/*
* Declarations for procedures that are used by the selection-related files
* but shouldn't be used anywhere else in Tk (or by Tk clients):
*/
MODULE_SCOPE TkSelInProgress *TkSelGetInProgress(void);
MODULE_SCOPE void TkSelSetInProgress(TkSelInProgress *pendingPtr);
MODULE_SCOPE void TkSelClearSelection(Tk_Window tkwin, XEvent *eventPtr);
MODULE_SCOPE int TkSelDefaultSelection(TkSelectionInfo *infoPtr,
Atom target, char *buffer, int maxBytes,
Atom *typePtr);
#ifndef TkSelUpdateClipboard
MODULE_SCOPE void TkSelUpdateClipboard(TkWindow *winPtr,
TkClipboardTarget *targetPtr);
#endif
#endif /* _TKSELECT */
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