607 lines
17 KiB
C
607 lines
17 KiB
C
/*
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* tkClipboard.c --
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*
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* This file manages the clipboard for the Tk toolkit,
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* maintaining a collection of data buffers that will be
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* supplied on demand to requesting applications.
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*
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* Copyright (c) 1994 The Regents of the University of California.
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* Copyright (c) 1994-1995 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tkClipboard.c 1.15 96/05/03 10:51:08
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*/
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#include "tkInt.h"
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#include "tkPort.h"
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#include "tkSelect.h"
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/*
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* Prototypes for procedures used only in this file:
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*/
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static int ClipboardAppHandler _ANSI_ARGS_((ClientData clientData,
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int offset, char *buffer, int maxBytes));
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static int ClipboardHandler _ANSI_ARGS_((ClientData clientData,
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int offset, char *buffer, int maxBytes));
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static int ClipboardWindowHandler _ANSI_ARGS_((
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ClientData clientData, int offset, char *buffer,
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int maxBytes));
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static void ClipboardLostSel _ANSI_ARGS_((ClientData clientData));
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/*
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*----------------------------------------------------------------------
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*
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* ClipboardHandler --
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*
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* This procedure acts as selection handler for the
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* clipboard manager. It extracts the required chunk of
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* data from the buffer chain for a given selection target.
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*
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* Results:
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* The return value is a count of the number of bytes
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* actually stored at buffer.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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static int
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ClipboardHandler(clientData, offset, buffer, maxBytes)
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ClientData clientData; /* Information about data to fetch. */
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int offset; /* Return selection bytes starting at this
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* offset. */
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char *buffer; /* Place to store converted selection. */
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int maxBytes; /* Maximum # of bytes to store at buffer. */
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{
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TkClipboardTarget *targetPtr = (TkClipboardTarget*) clientData;
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TkClipboardBuffer *cbPtr;
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char *srcPtr, *destPtr;
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int count = 0;
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int scanned = 0;
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size_t length, freeCount;
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/*
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* Skip to buffer containing offset byte
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*/
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for (cbPtr = targetPtr->firstBufferPtr; ; cbPtr = cbPtr->nextPtr) {
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if (cbPtr == NULL) {
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return 0;
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}
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if (scanned + cbPtr->length > offset) {
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break;
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}
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scanned += cbPtr->length;
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}
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/*
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* Copy up to maxBytes or end of list, switching buffers as needed.
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*/
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freeCount = maxBytes;
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srcPtr = cbPtr->buffer + (offset - scanned);
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destPtr = buffer;
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length = cbPtr->length - (offset - scanned);
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while (1) {
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if (length > freeCount) {
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strncpy(destPtr, srcPtr, freeCount);
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return maxBytes;
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} else {
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strncpy(destPtr, srcPtr, length);
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destPtr += length;
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count += length;
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freeCount -= length;
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}
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cbPtr = cbPtr->nextPtr;
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if (cbPtr == NULL) {
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break;
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}
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srcPtr = cbPtr->buffer;
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length = cbPtr->length;
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}
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return count;
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}
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/*
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*----------------------------------------------------------------------
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*
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* ClipboardAppHandler --
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*
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* This procedure acts as selection handler for retrievals of type
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* TK_APPLICATION. It returns the name of the application that
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* owns the clipboard. Note: we can't use the default Tk
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* selection handler for this selection type, because the clipboard
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* window isn't a "real" window and doesn't have the necessary
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* information.
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*
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* Results:
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* The return value is a count of the number of bytes
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* actually stored at buffer.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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static int
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ClipboardAppHandler(clientData, offset, buffer, maxBytes)
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ClientData clientData; /* Pointer to TkDisplay structure. */
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int offset; /* Return selection bytes starting at this
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* offset. */
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char *buffer; /* Place to store converted selection. */
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int maxBytes; /* Maximum # of bytes to store at buffer. */
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{
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TkDisplay *dispPtr = (TkDisplay *) clientData;
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size_t length;
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char *p;
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p = dispPtr->clipboardAppPtr->winPtr->nameUid;
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length = strlen(p);
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length -= offset;
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if (length <= 0) {
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return 0;
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}
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if (length > (size_t) maxBytes) {
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length = maxBytes;
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}
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strncpy(buffer, p, length);
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return length;
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}
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/*
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*----------------------------------------------------------------------
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*
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* ClipboardWindowHandler --
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*
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* This procedure acts as selection handler for retrievals of
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* type TK_WINDOW. Since the clipboard doesn't correspond to
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* any particular window, we just return ".". We can't use Tk's
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* default handler for this selection type, because the clipboard
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* window isn't a valid window.
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*
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* Results:
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* The return value is 1, the number of non-null bytes stored
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* at buffer.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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static int
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ClipboardWindowHandler(clientData, offset, buffer, maxBytes)
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ClientData clientData; /* Not used. */
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int offset; /* Return selection bytes starting at this
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* offset. */
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char *buffer; /* Place to store converted selection. */
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int maxBytes; /* Maximum # of bytes to store at buffer. */
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{
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buffer[0] = '.';
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buffer[1] = 0;
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return 1;
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}
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/*
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*----------------------------------------------------------------------
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*
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* ClipboardLostSel --
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*
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* This procedure is invoked whenever clipboard ownership is
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* claimed by another window. It just sets a flag so that we
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* know the clipboard was taken away.
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*
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* Results:
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* None.
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*
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* Side effects:
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* The clipboard is marked as inactive.
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*
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*----------------------------------------------------------------------
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*/
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static void
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ClipboardLostSel(clientData)
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ClientData clientData; /* Pointer to TkDisplay structure. */
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{
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TkDisplay *dispPtr = (TkDisplay*) clientData;
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dispPtr->clipboardActive = 0;
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tk_ClipboardClear --
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*
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* Take control of the clipboard and clear out the previous
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* contents. This procedure must be invoked before any
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* calls to Tk_AppendToClipboard.
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*
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* Results:
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* A standard Tcl result. If an error occurs, an error message is
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* left in interp->result.
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*
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* Side effects:
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* From now on, requests for the CLIPBOARD selection will be
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* directed to the clipboard manager routines associated with
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* clipWindow for the display of tkwin. In order to guarantee
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* atomicity, no event handling should occur between
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* Tk_ClipboardClear and the following Tk_AppendToClipboard
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* calls. This procedure may cause a user-defined LostSel command
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* to be invoked when the CLIPBOARD is claimed, so any calling
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* function should be reentrant at the point Tk_ClipboardClear is
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* invoked.
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*
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*----------------------------------------------------------------------
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*/
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int
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Tk_ClipboardClear(interp, tkwin)
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Tcl_Interp *interp; /* Interpreter to use for error reporting. */
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Tk_Window tkwin; /* Window in application that is clearing
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* clipboard; identifies application and
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* display. */
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{
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TkWindow *winPtr = (TkWindow *) tkwin;
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TkDisplay *dispPtr = winPtr->dispPtr;
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TkClipboardTarget *targetPtr, *nextTargetPtr;
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TkClipboardBuffer *cbPtr, *nextCbPtr;
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if (dispPtr->clipWindow == NULL) {
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int result;
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result = TkClipInit(interp, dispPtr);
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if (result != TCL_OK) {
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return result;
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}
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}
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/*
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* Discard any existing clipboard data and delete the selection
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* handler(s) associated with that data.
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*/
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for (targetPtr = dispPtr->clipTargetPtr; targetPtr != NULL;
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targetPtr = nextTargetPtr) {
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for (cbPtr = targetPtr->firstBufferPtr; cbPtr != NULL;
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cbPtr = nextCbPtr) {
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ckfree(cbPtr->buffer);
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nextCbPtr = cbPtr->nextPtr;
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ckfree((char *) cbPtr);
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}
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nextTargetPtr = targetPtr->nextPtr;
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Tk_DeleteSelHandler(dispPtr->clipWindow, dispPtr->clipboardAtom,
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targetPtr->type);
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ckfree((char *) targetPtr);
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}
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dispPtr->clipTargetPtr = NULL;
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/*
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* Reclaim the clipboard selection if we lost it.
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*/
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if (!dispPtr->clipboardActive) {
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Tk_OwnSelection(dispPtr->clipWindow, dispPtr->clipboardAtom,
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ClipboardLostSel, (ClientData) dispPtr);
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dispPtr->clipboardActive = 1;
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}
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dispPtr->clipboardAppPtr = winPtr->mainPtr;
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return TCL_OK;
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tk_ClipboardAppend --
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*
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* Append a buffer of data to the clipboard. The first buffer of
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* a given type determines the format for that type. Any successive
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* appends to that type must have the same format or an error will
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* be returned. Tk_ClipboardClear must be called before a sequence
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* of Tk_ClipboardAppend calls can be issued. In order to guarantee
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* atomicity, no event handling should occur between Tk_ClipboardClear
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* and the following Tk_AppendToClipboard calls.
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*
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* Results:
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* A standard Tcl result. If an error is returned, an error message
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* is left in interp->result.
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*
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* Side effects:
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* The specified buffer will be copied onto the end of the clipboard.
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* The clipboard maintains a list of buffers which will be used to
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* supply the data for a selection get request. The first time a given
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* type is appended, Tk_ClipboardAppend will register a selection
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* handler of the appropriate type.
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*
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*----------------------------------------------------------------------
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*/
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int
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Tk_ClipboardAppend(interp, tkwin, type, format, buffer)
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Tcl_Interp *interp; /* Used for error reporting. */
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Tk_Window tkwin; /* Window that selects a display. */
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Atom type; /* The desired conversion type for this
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* clipboard item, e.g. STRING or LENGTH. */
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Atom format; /* Format in which the selection
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* information should be returned to
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* the requestor. */
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char* buffer; /* NULL terminated string containing the data
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* to be added to the clipboard. */
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{
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TkWindow *winPtr = (TkWindow *) tkwin;
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TkDisplay *dispPtr = winPtr->dispPtr;
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TkClipboardTarget *targetPtr;
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TkClipboardBuffer *cbPtr;
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/*
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* If this application doesn't already own the clipboard, clear
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* the clipboard. If we don't own the clipboard selection, claim it.
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*/
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if (dispPtr->clipboardAppPtr != winPtr->mainPtr) {
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Tk_ClipboardClear(interp, tkwin);
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} else if (!dispPtr->clipboardActive) {
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Tk_OwnSelection(dispPtr->clipWindow, dispPtr->clipboardAtom,
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ClipboardLostSel, (ClientData) dispPtr);
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dispPtr->clipboardActive = 1;
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}
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/*
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* Check to see if the specified target is already present on the
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* clipboard. If it isn't, we need to create a new target; otherwise,
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* we just append the new buffer to the clipboard list.
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*/
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for (targetPtr = dispPtr->clipTargetPtr; targetPtr != NULL;
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targetPtr = targetPtr->nextPtr) {
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if (targetPtr->type == type)
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break;
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}
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if (targetPtr == NULL) {
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targetPtr = (TkClipboardTarget*) ckalloc(sizeof(TkClipboardTarget));
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targetPtr->type = type;
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targetPtr->format = format;
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targetPtr->firstBufferPtr = targetPtr->lastBufferPtr = NULL;
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targetPtr->nextPtr = dispPtr->clipTargetPtr;
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dispPtr->clipTargetPtr = targetPtr;
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Tk_CreateSelHandler(dispPtr->clipWindow, dispPtr->clipboardAtom,
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type, ClipboardHandler, (ClientData) targetPtr, format);
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} else if (targetPtr->format != format) {
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Tcl_AppendResult(interp, "format \"", Tk_GetAtomName(tkwin, format),
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"\" does not match current format \"",
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Tk_GetAtomName(tkwin, targetPtr->format),"\" for ",
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Tk_GetAtomName(tkwin, type), (char *) NULL);
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return TCL_ERROR;
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}
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/*
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* Append a new buffer to the buffer chain.
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*/
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cbPtr = (TkClipboardBuffer*) ckalloc(sizeof(TkClipboardBuffer));
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cbPtr->nextPtr = NULL;
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if (targetPtr->lastBufferPtr != NULL) {
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targetPtr->lastBufferPtr->nextPtr = cbPtr;
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} else {
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targetPtr->firstBufferPtr = cbPtr;
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}
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targetPtr->lastBufferPtr = cbPtr;
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cbPtr->length = strlen(buffer);
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cbPtr->buffer = (char *) ckalloc((unsigned) (cbPtr->length + 1));
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strcpy(cbPtr->buffer, buffer);
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TkSelUpdateClipboard((TkWindow*)(dispPtr->clipWindow), targetPtr);
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return TCL_OK;
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tk_ClipboardCmd --
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*
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* This procedure is invoked to process the "clipboard" Tcl
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* command. See the user documentation for details on what
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* it does.
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*
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* Results:
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* A standard Tcl result.
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*
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* Side effects:
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* See the user documentation.
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*
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*----------------------------------------------------------------------
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*/
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int
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Tk_ClipboardCmd(clientData, interp, argc, argv)
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ClientData clientData; /* Main window associated with
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* interpreter. */
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Tcl_Interp *interp; /* Current interpreter. */
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int argc; /* Number of arguments. */
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char **argv; /* Argument strings. */
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{
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Tk_Window tkwin = (Tk_Window) clientData;
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char *path = NULL;
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size_t length;
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int count;
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char c;
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char **args;
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if (argc < 2) {
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
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" option ?arg arg ...?\"", (char *) NULL);
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return TCL_ERROR;
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}
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c = argv[1][0];
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length = strlen(argv[1]);
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if ((c == 'a') && (strncmp(argv[1], "append", length) == 0)) {
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Atom target, format;
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char *targetName = NULL;
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char *formatName = NULL;
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for (count = argc-2, args = argv+2; count > 1; count -= 2, args += 2) {
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if (args[0][0] != '-') {
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break;
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}
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c = args[0][1];
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length = strlen(args[0]);
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if ((c == '-') && (length == 2)) {
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args++;
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count--;
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break;
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}
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if ((c == 'd') && (strncmp(args[0], "-displayof", length) == 0)) {
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path = args[1];
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} else if ((c == 'f')
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&& (strncmp(args[0], "-format", length) == 0)) {
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formatName = args[1];
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} else if ((c == 't')
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&& (strncmp(args[0], "-type", length) == 0)) {
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targetName = args[1];
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} else {
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Tcl_AppendResult(interp, "unknown option \"", args[0],
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"\"", (char *) NULL);
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return TCL_ERROR;
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}
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}
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if (count != 1) {
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
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" append ?options? data\"", (char *) NULL);
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return TCL_ERROR;
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}
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if (path != NULL) {
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tkwin = Tk_NameToWindow(interp, path, tkwin);
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}
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if (tkwin == NULL) {
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return TCL_ERROR;
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}
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if (targetName != NULL) {
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target = Tk_InternAtom(tkwin, targetName);
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} else {
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target = XA_STRING;
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}
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if (formatName != NULL) {
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format = Tk_InternAtom(tkwin, formatName);
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} else {
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format = XA_STRING;
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}
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return Tk_ClipboardAppend(interp, tkwin, target, format, args[0]);
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} else if ((c == 'c') && (strncmp(argv[1], "clear", length) == 0)) {
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for (count = argc-2, args = argv+2; count > 0; count -= 2, args += 2) {
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if (args[0][0] != '-') {
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break;
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}
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if (count < 2) {
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Tcl_AppendResult(interp, "value for \"", *args,
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"\" missing", (char *) NULL);
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return TCL_ERROR;
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}
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c = args[0][1];
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length = strlen(args[0]);
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if ((c == 'd') && (strncmp(args[0], "-displayof", length) == 0)) {
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path = args[1];
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} else {
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Tcl_AppendResult(interp, "unknown option \"", args[0],
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"\"", (char *) NULL);
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return TCL_ERROR;
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}
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}
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if (count > 0) {
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
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" clear ?options?\"", (char *) NULL);
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return TCL_ERROR;
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}
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if (path != NULL) {
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tkwin = Tk_NameToWindow(interp, path, tkwin);
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}
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if (tkwin == NULL) {
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return TCL_ERROR;
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}
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return Tk_ClipboardClear(interp, tkwin);
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} else {
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sprintf(interp->result,
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"bad option \"%.50s\": must be clear or append",
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argv[1]);
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return TCL_ERROR;
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}
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkClipInit --
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*
|
||
* This procedure is called to initialize the window for claiming
|
||
* clipboard ownership and for receiving selection get results. This
|
||
* function is called from tkSelect.c as well as tkClipboard.c.
|
||
*
|
||
* Results:
|
||
* The result is a standard Tcl return value, which is normally TCL_OK.
|
||
* If an error occurs then an error message is left in interp->result
|
||
* and TCL_ERROR is returned.
|
||
*
|
||
* Side effects:
|
||
* Sets up the clipWindow and related data structures.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
int
|
||
TkClipInit(interp, dispPtr)
|
||
Tcl_Interp *interp; /* Interpreter to use for error
|
||
* reporting. */
|
||
register TkDisplay *dispPtr;/* Display to initialize. */
|
||
{
|
||
XSetWindowAttributes atts;
|
||
|
||
dispPtr->clipTargetPtr = NULL;
|
||
dispPtr->clipboardActive = 0;
|
||
dispPtr->clipboardAppPtr = NULL;
|
||
|
||
/*
|
||
* Create the window used for clipboard ownership and selection retrieval,
|
||
* and set up an event handler for it.
|
||
*/
|
||
|
||
dispPtr->clipWindow = Tk_CreateWindow(interp, (Tk_Window) NULL,
|
||
"_clip", DisplayString(dispPtr->display));
|
||
if (dispPtr->clipWindow == NULL) {
|
||
return TCL_ERROR;
|
||
}
|
||
atts.override_redirect = True;
|
||
Tk_ChangeWindowAttributes(dispPtr->clipWindow, CWOverrideRedirect, &atts);
|
||
Tk_MakeWindowExist(dispPtr->clipWindow);
|
||
|
||
if (dispPtr->multipleAtom == None) {
|
||
/*
|
||
* Need to invoke selection initialization to make sure that
|
||
* atoms we depend on below are defined.
|
||
*/
|
||
|
||
TkSelInit(dispPtr->clipWindow);
|
||
}
|
||
|
||
/*
|
||
* Create selection handlers for types TK_APPLICATION and TK_WINDOW
|
||
* on this window. Can't use the default handlers for these types
|
||
* because this isn't a full-fledged window.
|
||
*/
|
||
|
||
Tk_CreateSelHandler(dispPtr->clipWindow, dispPtr->clipboardAtom,
|
||
dispPtr->applicationAtom, ClipboardAppHandler,
|
||
(ClientData) dispPtr, XA_STRING);
|
||
Tk_CreateSelHandler(dispPtr->clipWindow, dispPtr->clipboardAtom,
|
||
dispPtr->windowAtom, ClipboardWindowHandler,
|
||
(ClientData) dispPtr, XA_STRING);
|
||
return TCL_OK;
|
||
}
|