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authorWilliam Joye <wjoye@cfa.harvard.edu>2017-10-17 19:50:58 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2017-10-17 19:50:58 (GMT)
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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 */