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tkSelect.h
/* * 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 */