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/* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/tk_base/tkclipboard.c,v 1.1.1.1 2001/06/13 04:58:07 dtashley Exp $ */
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/*
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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) 1994-1997 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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* RCS: @(#) $Id: tkclipboard.c,v 1.1.1.1 2001/06/13 04:58:07 dtashley Exp $
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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_ClipboardAppend.
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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 the interp's 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_ClipboardAppend
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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_ClipboardAppend 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 the interp's 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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| 338 |
* to be added to the clipboard. */
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| 339 |
{
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| 340 |
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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| 344 |
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| 345 |
/*
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| 346 |
* If this application doesn't already own the clipboard, clear
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| 347 |
* the clipboard. If we don't own the clipboard selection, claim it.
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| 348 |
*/
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| 349 |
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| 350 |
if (dispPtr->clipboardAppPtr != winPtr->mainPtr) {
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| 351 |
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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| 356 |
}
|
| 357 |
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| 358 |
/*
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| 359 |
* Check to see if the specified target is already present on the
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| 360 |
* clipboard. If it isn't, we need to create a new target; otherwise,
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| 361 |
* we just append the new buffer to the clipboard list.
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| 362 |
*/
|
| 363 |
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| 364 |
for (targetPtr = dispPtr->clipTargetPtr; targetPtr != NULL;
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| 365 |
targetPtr = targetPtr->nextPtr) {
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| 366 |
if (targetPtr->type == type)
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| 367 |
break;
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| 368 |
}
|
| 369 |
if (targetPtr == NULL) {
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| 370 |
targetPtr = (TkClipboardTarget*) ckalloc(sizeof(TkClipboardTarget));
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| 371 |
targetPtr->type = type;
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| 372 |
targetPtr->format = format;
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| 373 |
targetPtr->firstBufferPtr = targetPtr->lastBufferPtr = NULL;
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| 374 |
targetPtr->nextPtr = dispPtr->clipTargetPtr;
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| 375 |
dispPtr->clipTargetPtr = targetPtr;
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| 376 |
Tk_CreateSelHandler(dispPtr->clipWindow, dispPtr->clipboardAtom,
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| 377 |
type, ClipboardHandler, (ClientData) targetPtr, format);
|
| 378 |
} else if (targetPtr->format != format) {
|
| 379 |
Tcl_AppendResult(interp, "format \"", Tk_GetAtomName(tkwin, format),
|
| 380 |
"\" does not match current format \"",
|
| 381 |
Tk_GetAtomName(tkwin, targetPtr->format),"\" for ",
|
| 382 |
Tk_GetAtomName(tkwin, type), (char *) NULL);
|
| 383 |
return TCL_ERROR;
|
| 384 |
}
|
| 385 |
|
| 386 |
/*
|
| 387 |
* Append a new buffer to the buffer chain.
|
| 388 |
*/
|
| 389 |
|
| 390 |
cbPtr = (TkClipboardBuffer*) ckalloc(sizeof(TkClipboardBuffer));
|
| 391 |
cbPtr->nextPtr = NULL;
|
| 392 |
if (targetPtr->lastBufferPtr != NULL) {
|
| 393 |
targetPtr->lastBufferPtr->nextPtr = cbPtr;
|
| 394 |
} else {
|
| 395 |
targetPtr->firstBufferPtr = cbPtr;
|
| 396 |
}
|
| 397 |
targetPtr->lastBufferPtr = cbPtr;
|
| 398 |
|
| 399 |
cbPtr->length = strlen(buffer);
|
| 400 |
cbPtr->buffer = (char *) ckalloc((unsigned) (cbPtr->length + 1));
|
| 401 |
strcpy(cbPtr->buffer, buffer);
|
| 402 |
|
| 403 |
TkSelUpdateClipboard((TkWindow*)(dispPtr->clipWindow), targetPtr);
|
| 404 |
|
| 405 |
return TCL_OK;
|
| 406 |
}
|
| 407 |
|
| 408 |
/*
|
| 409 |
*----------------------------------------------------------------------
|
| 410 |
*
|
| 411 |
* Tk_ClipboardCmd --
|
| 412 |
*
|
| 413 |
* This procedure is invoked to process the "clipboard" Tcl
|
| 414 |
* command. See the user documentation for details on what
|
| 415 |
* it does.
|
| 416 |
*
|
| 417 |
* Results:
|
| 418 |
* A standard Tcl result.
|
| 419 |
*
|
| 420 |
* Side effects:
|
| 421 |
* See the user documentation.
|
| 422 |
*
|
| 423 |
*----------------------------------------------------------------------
|
| 424 |
*/
|
| 425 |
|
| 426 |
int
|
| 427 |
Tk_ClipboardCmd(clientData, interp, argc, argv)
|
| 428 |
ClientData clientData; /* Main window associated with
|
| 429 |
* interpreter. */
|
| 430 |
Tcl_Interp *interp; /* Current interpreter. */
|
| 431 |
int argc; /* Number of arguments. */
|
| 432 |
char **argv; /* Argument strings. */
|
| 433 |
{
|
| 434 |
Tk_Window tkwin = (Tk_Window) clientData;
|
| 435 |
char *path = NULL;
|
| 436 |
size_t length;
|
| 437 |
int count;
|
| 438 |
char c;
|
| 439 |
char **args;
|
| 440 |
|
| 441 |
if (argc < 2) {
|
| 442 |
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
|
| 443 |
" option ?arg arg ...?\"", (char *) NULL);
|
| 444 |
return TCL_ERROR;
|
| 445 |
}
|
| 446 |
c = argv[1][0];
|
| 447 |
length = strlen(argv[1]);
|
| 448 |
if ((c == 'a') && (strncmp(argv[1], "append", length) == 0)) {
|
| 449 |
Atom target, format;
|
| 450 |
char *targetName = NULL;
|
| 451 |
char *formatName = NULL;
|
| 452 |
|
| 453 |
for (count = argc-2, args = argv+2; count > 1; count -= 2, args += 2) {
|
| 454 |
if (args[0][0] != '-') {
|
| 455 |
break;
|
| 456 |
}
|
| 457 |
c = args[0][1];
|
| 458 |
length = strlen(args[0]);
|
| 459 |
if ((c == '-') && (length == 2)) {
|
| 460 |
args++;
|
| 461 |
count--;
|
| 462 |
break;
|
| 463 |
}
|
| 464 |
if ((c == 'd') && (strncmp(args[0], "-displayof", length) == 0)) {
|
| 465 |
path = args[1];
|
| 466 |
} else if ((c == 'f')
|
| 467 |
&& (strncmp(args[0], "-format", length) == 0)) {
|
| 468 |
formatName = args[1];
|
| 469 |
} else if ((c == 't')
|
| 470 |
&& (strncmp(args[0], "-type", length) == 0)) {
|
| 471 |
targetName = args[1];
|
| 472 |
} else {
|
| 473 |
Tcl_AppendResult(interp, "unknown option \"", args[0],
|
| 474 |
"\"", (char *) NULL);
|
| 475 |
return TCL_ERROR;
|
| 476 |
}
|
| 477 |
}
|
| 478 |
if (count != 1) {
|
| 479 |
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
|
| 480 |
" append ?options? data\"", (char *) NULL);
|
| 481 |
return TCL_ERROR;
|
| 482 |
}
|
| 483 |
if (path != NULL) {
|
| 484 |
tkwin = Tk_NameToWindow(interp, path, tkwin);
|
| 485 |
}
|
| 486 |
if (tkwin == NULL) {
|
| 487 |
return TCL_ERROR;
|
| 488 |
}
|
| 489 |
if (targetName != NULL) {
|
| 490 |
target = Tk_InternAtom(tkwin, targetName);
|
| 491 |
} else {
|
| 492 |
target = XA_STRING;
|
| 493 |
}
|
| 494 |
if (formatName != NULL) {
|
| 495 |
format = Tk_InternAtom(tkwin, formatName);
|
| 496 |
} else {
|
| 497 |
format = XA_STRING;
|
| 498 |
}
|
| 499 |
return Tk_ClipboardAppend(interp, tkwin, target, format, args[0]);
|
| 500 |
} else if ((c == 'c') && (strncmp(argv[1], "clear", length) == 0)) {
|
| 501 |
for (count = argc-2, args = argv+2; count > 0; count -= 2, args += 2) {
|
| 502 |
if (args[0][0] != '-') {
|
| 503 |
break;
|
| 504 |
}
|
| 505 |
if (count < 2) {
|
| 506 |
Tcl_AppendResult(interp, "value for \"", *args,
|
| 507 |
"\" missing", (char *) NULL);
|
| 508 |
return TCL_ERROR;
|
| 509 |
}
|
| 510 |
c = args[0][1];
|
| 511 |
length = strlen(args[0]);
|
| 512 |
if ((c == 'd') && (strncmp(args[0], "-displayof", length) == 0)) {
|
| 513 |
path = args[1];
|
| 514 |
} else {
|
| 515 |
Tcl_AppendResult(interp, "unknown option \"", args[0],
|
| 516 |
"\"", (char *) NULL);
|
| 517 |
return TCL_ERROR;
|
| 518 |
}
|
| 519 |
}
|
| 520 |
if (count > 0) {
|
| 521 |
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
|
| 522 |
" clear ?options?\"", (char *) NULL);
|
| 523 |
return TCL_ERROR;
|
| 524 |
}
|
| 525 |
if (path != NULL) {
|
| 526 |
tkwin = Tk_NameToWindow(interp, path, tkwin);
|
| 527 |
}
|
| 528 |
if (tkwin == NULL) {
|
| 529 |
return TCL_ERROR;
|
| 530 |
}
|
| 531 |
return Tk_ClipboardClear(interp, tkwin);
|
| 532 |
} else {
|
| 533 |
char buf[100 + TCL_INTEGER_SPACE];
|
| 534 |
|
| 535 |
sprintf(buf, "bad option \"%.50s\": must be clear or append", argv[1]);
|
| 536 |
Tcl_SetResult(interp, buf, TCL_VOLATILE);
|
| 537 |
return TCL_ERROR;
|
| 538 |
}
|
| 539 |
}
|
| 540 |
|
| 541 |
/*
|
| 542 |
*----------------------------------------------------------------------
|
| 543 |
*
|
| 544 |
* TkClipInit --
|
| 545 |
*
|
| 546 |
* This procedure is called to initialize the window for claiming
|
| 547 |
* clipboard ownership and for receiving selection get results. This
|
| 548 |
* function is called from tkSelect.c as well as tkClipboard.c.
|
| 549 |
*
|
| 550 |
* Results:
|
| 551 |
* The result is a standard Tcl return value, which is normally TCL_OK.
|
| 552 |
* If an error occurs then an error message is left in the interp's
|
| 553 |
* result and TCL_ERROR is returned.
|
| 554 |
*
|
| 555 |
* Side effects:
|
| 556 |
* Sets up the clipWindow and related data structures.
|
| 557 |
*
|
| 558 |
*----------------------------------------------------------------------
|
| 559 |
*/
|
| 560 |
|
| 561 |
int
|
| 562 |
TkClipInit(interp, dispPtr)
|
| 563 |
Tcl_Interp *interp; /* Interpreter to use for error
|
| 564 |
* reporting. */
|
| 565 |
register TkDisplay *dispPtr;/* Display to initialize. */
|
| 566 |
{
|
| 567 |
XSetWindowAttributes atts;
|
| 568 |
|
| 569 |
dispPtr->clipTargetPtr = NULL;
|
| 570 |
dispPtr->clipboardActive = 0;
|
| 571 |
dispPtr->clipboardAppPtr = NULL;
|
| 572 |
|
| 573 |
/*
|
| 574 |
* Create the window used for clipboard ownership and selection retrieval,
|
| 575 |
* and set up an event handler for it.
|
| 576 |
*/
|
| 577 |
|
| 578 |
dispPtr->clipWindow = Tk_CreateWindow(interp, (Tk_Window) NULL,
|
| 579 |
"_clip", DisplayString(dispPtr->display));
|
| 580 |
if (dispPtr->clipWindow == NULL) {
|
| 581 |
return TCL_ERROR;
|
| 582 |
}
|
| 583 |
atts.override_redirect = True;
|
| 584 |
Tk_ChangeWindowAttributes(dispPtr->clipWindow, CWOverrideRedirect, &atts);
|
| 585 |
Tk_MakeWindowExist(dispPtr->clipWindow);
|
| 586 |
|
| 587 |
if (dispPtr->multipleAtom == None) {
|
| 588 |
/*
|
| 589 |
* Need to invoke selection initialization to make sure that
|
| 590 |
* atoms we depend on below are defined.
|
| 591 |
*/
|
| 592 |
|
| 593 |
TkSelInit(dispPtr->clipWindow);
|
| 594 |
}
|
| 595 |
|
| 596 |
/*
|
| 597 |
* Create selection handlers for types TK_APPLICATION and TK_WINDOW
|
| 598 |
* on this window. Can't use the default handlers for these types
|
| 599 |
* because this isn't a full-fledged window.
|
| 600 |
*/
|
| 601 |
|
| 602 |
Tk_CreateSelHandler(dispPtr->clipWindow, dispPtr->clipboardAtom,
|
| 603 |
dispPtr->applicationAtom, ClipboardAppHandler,
|
| 604 |
(ClientData) dispPtr, XA_STRING);
|
| 605 |
Tk_CreateSelHandler(dispPtr->clipWindow, dispPtr->clipboardAtom,
|
| 606 |
dispPtr->windowAtom, ClipboardWindowHandler,
|
| 607 |
(ClientData) dispPtr, XA_STRING);
|
| 608 |
return TCL_OK;
|
| 609 |
}
|
| 610 |
|
| 611 |
|
| 612 |
/* $History: tkClipboard.c $
|
| 613 |
*
|
| 614 |
* ***************** Version 1 *****************
|
| 615 |
* User: Dtashley Date: 1/02/01 Time: 2:41a
|
| 616 |
* Created in $/IjuScripter, IjuConsole/Source/Tk Base
|
| 617 |
* Initial check-in.
|
| 618 |
*/
|
| 619 |
|
| 620 |
/* End of TKCLIPBOARD.C */ |
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