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dashley |
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/* $Header$ */ |
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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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} |
297 |
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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 -- |
305 |
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* |
306 |
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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 |
312 |
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* and the following Tk_ClipboardAppend calls. |
313 |
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* |
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* Results: |
315 |
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* A standard Tcl result. If an error is returned, an error message |
316 |
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* is left in the interp's result. |
317 |
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* |
318 |
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* Side effects: |
319 |
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* The specified buffer will be copied onto the end of the clipboard. |
320 |
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* The clipboard maintains a list of buffers which will be used to |
321 |
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* supply the data for a selection get request. The first time a given |
322 |
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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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*---------------------------------------------------------------------- |
326 |
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*/ |
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int |
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Tk_ClipboardAppend(interp, tkwin, type, format, buffer) |
330 |
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Tcl_Interp *interp; /* Used for error reporting. */ |
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Tk_Window tkwin; /* Window that selects a display. */ |
332 |
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Atom type; /* The desired conversion type for this |
333 |
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* clipboard item, e.g. STRING or LENGTH. */ |
334 |
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Atom format; /* Format in which the selection |
335 |
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* information should be returned to |
336 |
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* the requestor. */ |
337 |
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char* buffer; /* NULL terminated string containing the data |
338 |
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* to be added to the clipboard. */ |
339 |
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{ |
340 |
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TkWindow *winPtr = (TkWindow *) tkwin; |
341 |
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TkDisplay *dispPtr = winPtr->dispPtr; |
342 |
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TkClipboardTarget *targetPtr; |
343 |
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TkClipboardBuffer *cbPtr; |
344 |
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|
345 |
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/* |
346 |
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* If this application doesn't already own the clipboard, clear |
347 |
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* the clipboard. If we don't own the clipboard selection, claim it. |
348 |
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*/ |
349 |
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350 |
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if (dispPtr->clipboardAppPtr != winPtr->mainPtr) { |
351 |
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Tk_ClipboardClear(interp, tkwin); |
352 |
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} else if (!dispPtr->clipboardActive) { |
353 |
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Tk_OwnSelection(dispPtr->clipWindow, dispPtr->clipboardAtom, |
354 |
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ClipboardLostSel, (ClientData) dispPtr); |
355 |
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dispPtr->clipboardActive = 1; |
356 |
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} |
357 |
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|
358 |
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/* |
359 |
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* Check to see if the specified target is already present on the |
360 |
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* clipboard. If it isn't, we need to create a new target; otherwise, |
361 |
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* we just append the new buffer to the clipboard list. |
362 |
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*/ |
363 |
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364 |
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for (targetPtr = dispPtr->clipTargetPtr; targetPtr != NULL; |
365 |
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targetPtr = targetPtr->nextPtr) { |
366 |
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if (targetPtr->type == type) |
367 |
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break; |
368 |
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} |
369 |
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if (targetPtr == NULL) { |
370 |
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targetPtr = (TkClipboardTarget*) ckalloc(sizeof(TkClipboardTarget)); |
371 |
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targetPtr->type = type; |
372 |
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targetPtr->format = format; |
373 |
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targetPtr->firstBufferPtr = targetPtr->lastBufferPtr = NULL; |
374 |
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targetPtr->nextPtr = dispPtr->clipTargetPtr; |
375 |
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dispPtr->clipTargetPtr = targetPtr; |
376 |
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Tk_CreateSelHandler(dispPtr->clipWindow, dispPtr->clipboardAtom, |
377 |
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type, ClipboardHandler, (ClientData) targetPtr, format); |
378 |
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} else if (targetPtr->format != format) { |
379 |
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Tcl_AppendResult(interp, "format \"", Tk_GetAtomName(tkwin, format), |
380 |
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"\" does not match current format \"", |
381 |
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Tk_GetAtomName(tkwin, targetPtr->format),"\" for ", |
382 |
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Tk_GetAtomName(tkwin, type), (char *) NULL); |
383 |
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return TCL_ERROR; |
384 |
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} |
385 |
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|
386 |
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/* |
387 |
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* Append a new buffer to the buffer chain. |
388 |
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*/ |
389 |
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|
390 |
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cbPtr = (TkClipboardBuffer*) ckalloc(sizeof(TkClipboardBuffer)); |
391 |
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cbPtr->nextPtr = NULL; |
392 |
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if (targetPtr->lastBufferPtr != NULL) { |
393 |
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targetPtr->lastBufferPtr->nextPtr = cbPtr; |
394 |
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} else { |
395 |
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targetPtr->firstBufferPtr = cbPtr; |
396 |
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} |
397 |
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targetPtr->lastBufferPtr = cbPtr; |
398 |
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|
399 |
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cbPtr->length = strlen(buffer); |
400 |
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cbPtr->buffer = (char *) ckalloc((unsigned) (cbPtr->length + 1)); |
401 |
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strcpy(cbPtr->buffer, buffer); |
402 |
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403 |
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TkSelUpdateClipboard((TkWindow*)(dispPtr->clipWindow), targetPtr); |
404 |
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|
405 |
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return TCL_OK; |
406 |
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} |
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 |
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|
* 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 |
|
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int argc; /* Number of arguments. */ |
432 |
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char **argv; /* Argument strings. */ |
433 |
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{ |
434 |
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Tk_Window tkwin = (Tk_Window) clientData; |
435 |
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|
char *path = NULL; |
436 |
|
|
size_t length; |
437 |
|
|
int count; |
438 |
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char c; |
439 |
|
|
char **args; |
440 |
|
|
|
441 |
|
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if (argc < 2) { |
442 |
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Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], |
443 |
|
|
" option ?arg arg ...?\"", (char *) NULL); |
444 |
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|
return TCL_ERROR; |
445 |
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} |
446 |
|
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c = argv[1][0]; |
447 |
|
|
length = strlen(argv[1]); |
448 |
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if ((c == 'a') && (strncmp(argv[1], "append", length) == 0)) { |
449 |
|
|
Atom target, format; |
450 |
|
|
char *targetName = NULL; |
451 |
|
|
char *formatName = NULL; |
452 |
|
|
|
453 |
|
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for (count = argc-2, args = argv+2; count > 1; count -= 2, args += 2) { |
454 |
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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 |
|
|
/* End of tkclipboard.c */ |