527 lines
19 KiB
C
527 lines
19 KiB
C
/*
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*Copyright (C) 2003-2004 Harold L Hunt II All Rights Reserved.
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*Copyright (C) Colin Harrison 2005-2008
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*
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*Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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*"Software"), to deal in the Software without restriction, including
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*without limitation the rights to use, copy, modify, merge, publish,
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*distribute, sublicense, and/or sell copies of the Software, and to
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*permit persons to whom the Software is furnished to do so, subject to
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*the following conditions:
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*
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*The above copyright notice and this permission notice shall be
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*included in all copies or substantial portions of the Software.
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*
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*THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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*EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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*MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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*NONINFRINGEMENT. IN NO EVENT SHALL HAROLD L HUNT II BE LIABLE FOR
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*ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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*CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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*WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*Except as contained in this notice, the name of the copyright holder(s)
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*and author(s) shall not be used in advertising or otherwise to promote
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*the sale, use or other dealings in this Software without prior written
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*authorization from the copyright holder(s) and author(s).
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*
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* Authors: Harold L Hunt II
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* Colin Harrison
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*/
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#ifdef HAVE_XWIN_CONFIG_H
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#include <xwin-config.h>
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#endif
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#include <sys/types.h>
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#include <sys/time.h>
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#include "winclipboard.h"
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#include "misc.h"
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/*
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* Constants
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*/
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#define WIN_POLL_TIMEOUT 1
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/*
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* References to external symbols
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*/
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extern Bool g_fUseUnicode;
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extern Bool g_fUnicodeSupport;
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extern void *g_pClipboardDisplay;
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extern Window g_iClipboardWindow;
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extern Atom g_atomLastOwnedSelection;
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/*
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* Local function prototypes
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*/
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static int
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winProcessXEventsTimeout(HWND hwnd, int iWindow, Display * pDisplay,
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Bool fUseUnicode, int iTimeoutSec);
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/*
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* Process X events up to specified timeout
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*/
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static int
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winProcessXEventsTimeout(HWND hwnd, int iWindow, Display * pDisplay,
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Bool fUseUnicode, int iTimeoutSec)
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{
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int iConnNumber;
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struct timeval tv;
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int iReturn;
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DWORD dwStopTime = (GetTickCount() / 1000) + iTimeoutSec;
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/* We need to ensure that all pending events are processed */
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XSync(pDisplay, FALSE);
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/* Get our connection number */
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iConnNumber = ConnectionNumber(pDisplay);
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/* Loop for X events */
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while (1) {
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fd_set fdsRead;
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/* Setup the file descriptor set */
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FD_ZERO(&fdsRead);
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FD_SET(iConnNumber, &fdsRead);
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/* Adjust timeout */
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tv.tv_sec = dwStopTime - (GetTickCount() / 1000);
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tv.tv_usec = 0;
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/* Break out if no time left */
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if (tv.tv_sec < 0)
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return WIN_XEVENTS_SUCCESS;
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/* Wait for an X event */
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iReturn = select(iConnNumber + 1, /* Highest fds number */
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&fdsRead, /* Read mask */
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NULL, /* No write mask */
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NULL, /* No exception mask */
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&tv); /* No timeout */
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if (iReturn < 0) {
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ErrorF("winProcessXEventsTimeout - Call to select () failed: %d. "
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"Bailing.\n", iReturn);
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break;
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}
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/* Branch on which descriptor became active */
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if (FD_ISSET(iConnNumber, &fdsRead)) {
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/* Process X events */
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/* Exit when we see that server is shutting down */
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iReturn = winClipboardFlushXEvents(hwnd,
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iWindow, pDisplay, fUseUnicode);
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if (WIN_XEVENTS_NOTIFY == iReturn) {
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/* Bail out if notify processed */
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return iReturn;
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}
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}
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}
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return WIN_XEVENTS_SUCCESS;
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}
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/*
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* Process a given Windows message
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*/
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LRESULT CALLBACK
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winClipboardWindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
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{
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static HWND s_hwndNextViewer;
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static Bool s_fCBCInitialized;
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/* Branch on message type */
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switch (message) {
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case WM_DESTROY:
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{
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winDebug("winClipboardWindowProc - WM_DESTROY\n");
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/* Remove ourselves from the clipboard chain */
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ChangeClipboardChain(hwnd, s_hwndNextViewer);
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s_hwndNextViewer = NULL;
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PostQuitMessage(0);
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}
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return 0;
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case WM_CREATE:
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{
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HWND first, next;
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DWORD error_code = 0;
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winDebug("winClipboardWindowProc - WM_CREATE\n");
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first = GetClipboardViewer(); /* Get handle to first viewer in chain. */
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if (first == hwnd)
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return 0; /* Make sure it's not us! */
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/* Add ourselves to the clipboard viewer chain */
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next = SetClipboardViewer(hwnd);
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error_code = GetLastError();
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if (SUCCEEDED(error_code) && (next == first)) /* SetClipboardViewer must have succeeded, and the handle */
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s_hwndNextViewer = next; /* it returned must have been the first window in the chain */
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else
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s_fCBCInitialized = FALSE;
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}
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return 0;
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case WM_CHANGECBCHAIN:
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{
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winDebug("winClipboardWindowProc - WM_CHANGECBCHAIN: wParam(%x) "
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"lParam(%x) s_hwndNextViewer(%x)\n",
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wParam, lParam, s_hwndNextViewer);
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if ((HWND) wParam == s_hwndNextViewer) {
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s_hwndNextViewer = (HWND) lParam;
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if (s_hwndNextViewer == hwnd) {
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s_hwndNextViewer = NULL;
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winErrorFVerb(1, "winClipboardWindowProc - WM_CHANGECBCHAIN: "
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"attempted to set next window to ourselves.");
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}
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}
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else if (s_hwndNextViewer)
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SendMessage(s_hwndNextViewer, message, wParam, lParam);
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}
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winDebug("winClipboardWindowProc - WM_CHANGECBCHAIN: Exit\n");
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return 0;
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case WM_WM_REINIT:
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{
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/* Ensure that we're in the clipboard chain. Some apps,
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* WinXP's remote desktop for one, don't play nice with the
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* chain. This message is called whenever we receive a
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* WM_ACTIVATEAPP message to ensure that we continue to
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* receive clipboard messages.
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*
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* It might be possible to detect if we're still in the chain
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* by calling SendMessage (GetClipboardViewer(),
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* WM_DRAWCLIPBOARD, 0, 0); and then seeing if we get the
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* WM_DRAWCLIPBOARD message. That, however, might be more
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* expensive than just putting ourselves back into the chain.
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*/
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HWND first, next;
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DWORD error_code = 0;
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winDebug("winClipboardWindowProc - WM_WM_REINIT: Enter\n");
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first = GetClipboardViewer(); /* Get handle to first viewer in chain. */
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if (first == hwnd)
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return 0; /* Make sure it's not us! */
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winDebug(" WM_WM_REINIT: Replacing us(%x) with %x at head "
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"of chain\n", hwnd, s_hwndNextViewer);
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s_fCBCInitialized = FALSE;
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ChangeClipboardChain(hwnd, s_hwndNextViewer);
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s_hwndNextViewer = NULL;
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s_fCBCInitialized = FALSE;
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winDebug(" WM_WM_REINIT: Putting us back at head of chain.\n");
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first = GetClipboardViewer(); /* Get handle to first viewer in chain. */
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if (first == hwnd)
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return 0; /* Make sure it's not us! */
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next = SetClipboardViewer(hwnd);
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error_code = GetLastError();
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if (SUCCEEDED(error_code) && (next == first)) /* SetClipboardViewer must have succeeded, and the handle */
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s_hwndNextViewer = next; /* it returned must have been the first window in the chain */
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else
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s_fCBCInitialized = FALSE;
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}
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winDebug("winClipboardWindowProc - WM_WM_REINIT: Exit\n");
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return 0;
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case WM_DRAWCLIPBOARD:
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{
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static Atom atomClipboard;
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static int generation;
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static Bool s_fProcessingDrawClipboard = FALSE;
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Display *pDisplay = g_pClipboardDisplay;
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Window iWindow = g_iClipboardWindow;
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int iReturn;
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winDebug("winClipboardWindowProc - WM_DRAWCLIPBOARD: Enter\n");
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if (generation != serverGeneration) {
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generation = serverGeneration;
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atomClipboard = XInternAtom(pDisplay, "CLIPBOARD", False);
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}
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/*
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* We've occasionally seen a loop in the clipboard chain.
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* Try and fix it on the first hint of recursion.
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*/
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if (!s_fProcessingDrawClipboard) {
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s_fProcessingDrawClipboard = TRUE;
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}
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else {
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/* Attempt to break the nesting by getting out of the chain, twice?, and then fix and bail */
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s_fCBCInitialized = FALSE;
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ChangeClipboardChain(hwnd, s_hwndNextViewer);
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winFixClipboardChain();
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winErrorFVerb(1, "winClipboardWindowProc - WM_DRAWCLIPBOARD - "
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"Nested calls detected. Re-initing.\n");
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winDebug("winClipboardWindowProc - WM_DRAWCLIPBOARD: Exit\n");
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s_fProcessingDrawClipboard = FALSE;
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return 0;
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}
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/* Bail on first message */
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if (!s_fCBCInitialized) {
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s_fCBCInitialized = TRUE;
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s_fProcessingDrawClipboard = FALSE;
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winDebug("winClipboardWindowProc - WM_DRAWCLIPBOARD: Exit\n");
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return 0;
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}
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/*
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* NOTE: We cannot bail out when NULL == GetClipboardOwner ()
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* because some applications deal with the clipboard in a manner
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* that causes the clipboard owner to be NULL when they are in
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* fact taking ownership. One example of this is the Win32
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* native compile of emacs.
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*/
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/* Bail when we still own the clipboard */
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if (hwnd == GetClipboardOwner()) {
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winDebug("winClipboardWindowProc - WM_DRAWCLIPBOARD - "
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"We own the clipboard, returning.\n");
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winDebug("winClipboardWindowProc - WM_DRAWCLIPBOARD: Exit\n");
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s_fProcessingDrawClipboard = FALSE;
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if (s_hwndNextViewer)
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SendMessage(s_hwndNextViewer, message, wParam, lParam);
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return 0;
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}
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/*
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* Do not take ownership of the X11 selections when something
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* other than CF_TEXT or CF_UNICODETEXT has been copied
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* into the Win32 clipboard.
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*/
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if (!IsClipboardFormatAvailable(CF_TEXT)
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&& !IsClipboardFormatAvailable(CF_UNICODETEXT)) {
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winDebug("winClipboardWindowProc - WM_DRAWCLIPBOARD - "
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"Clipboard does not contain CF_TEXT nor "
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"CF_UNICODETEXT.\n");
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/*
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* We need to make sure that the X Server has processed
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* previous XSetSelectionOwner messages.
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*/
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XSync(pDisplay, FALSE);
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winDebug("winClipboardWindowProc - XSync done.\n");
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/* Release PRIMARY selection if owned */
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iReturn = XGetSelectionOwner(pDisplay, XA_PRIMARY);
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if (iReturn == g_iClipboardWindow) {
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winDebug("winClipboardWindowProc - WM_DRAWCLIPBOARD - "
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"PRIMARY selection is owned by us.\n");
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XSetSelectionOwner(pDisplay, XA_PRIMARY, None, CurrentTime);
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}
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else if (BadWindow == iReturn || BadAtom == iReturn)
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winErrorFVerb(1, "winClipboardWindowProc - WM_DRAWCLIPBOARD - "
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"XGetSelection failed for PRIMARY: %d\n",
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iReturn);
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/* Release CLIPBOARD selection if owned */
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iReturn = XGetSelectionOwner(pDisplay, atomClipboard);
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if (iReturn == g_iClipboardWindow) {
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winDebug("winClipboardWindowProc - WM_DRAWCLIPBOARD - "
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"CLIPBOARD selection is owned by us.\n");
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XSetSelectionOwner(pDisplay, atomClipboard, None, CurrentTime);
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}
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else if (BadWindow == iReturn || BadAtom == iReturn)
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winErrorFVerb(1, "winClipboardWindowProc - WM_DRAWCLIPBOARD - "
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"XGetSelection failed for CLIPBOARD: %d\n",
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iReturn);
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winDebug("winClipboardWindowProc - WM_DRAWCLIPBOARD: Exit\n");
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s_fProcessingDrawClipboard = FALSE;
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if (s_hwndNextViewer)
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SendMessage(s_hwndNextViewer, message, wParam, lParam);
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return 0;
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}
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/* Reassert ownership of PRIMARY */
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iReturn = XSetSelectionOwner(pDisplay,
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XA_PRIMARY, iWindow, CurrentTime);
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if (iReturn == BadAtom || iReturn == BadWindow ||
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XGetSelectionOwner(pDisplay, XA_PRIMARY) != iWindow) {
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winErrorFVerb(1, "winClipboardWindowProc - WM_DRAWCLIPBOARD - "
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"Could not reassert ownership of PRIMARY\n");
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}
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else {
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winDebug("winClipboardWindowProc - WM_DRAWCLIPBOARD - "
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"Reasserted ownership of PRIMARY\n");
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}
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/* Reassert ownership of the CLIPBOARD */
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iReturn = XSetSelectionOwner(pDisplay,
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atomClipboard, iWindow, CurrentTime);
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if (iReturn == BadAtom || iReturn == BadWindow ||
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XGetSelectionOwner(pDisplay, atomClipboard) != iWindow) {
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winErrorFVerb(1, "winClipboardWindowProc - WM_DRAWCLIPBOARD - "
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"Could not reassert ownership of CLIPBOARD\n");
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}
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else {
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winDebug("winClipboardWindowProc - WM_DRAWCLIPBOARD - "
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"Reasserted ownership of CLIPBOARD\n");
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}
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/* Flush the pending SetSelectionOwner event now */
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XFlush(pDisplay);
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s_fProcessingDrawClipboard = FALSE;
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}
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winDebug("winClipboardWindowProc - WM_DRAWCLIPBOARD: Exit\n");
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/* Pass the message on the next window in the clipboard viewer chain */
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if (s_hwndNextViewer)
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SendMessage(s_hwndNextViewer, message, wParam, lParam);
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return 0;
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case WM_DESTROYCLIPBOARD:
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/*
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* NOTE: Intentionally do nothing.
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* Changes in the Win32 clipboard are handled by WM_DRAWCLIPBOARD
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* above. We only process this message to conform to the specs
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* for delayed clipboard rendering in Win32. You might think
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* that we need to release ownership of the X11 selections, but
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* we do not, because a WM_DRAWCLIPBOARD message will closely
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* follow this message and reassert ownership of the X11
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* selections, handling the issue for us.
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*/
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winDebug("winClipboardWindowProc - WM_DESTROYCLIPBOARD - Ignored.\n");
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return 0;
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case WM_RENDERFORMAT:
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case WM_RENDERALLFORMATS:
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{
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int iReturn;
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Display *pDisplay = g_pClipboardDisplay;
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Window iWindow = g_iClipboardWindow;
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Bool fConvertToUnicode;
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winDebug("winClipboardWindowProc - WM_RENDER*FORMAT - Hello.\n");
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/* Flag whether to convert to Unicode or not */
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if (message == WM_RENDERALLFORMATS)
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fConvertToUnicode = FALSE;
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else
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fConvertToUnicode = g_fUnicodeSupport && (CF_UNICODETEXT == wParam);
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/* Request the selection contents */
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iReturn = XConvertSelection(pDisplay,
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g_atomLastOwnedSelection,
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XInternAtom(pDisplay,
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"COMPOUND_TEXT", False),
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XInternAtom(pDisplay,
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"CYGX_CUT_BUFFER", False),
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iWindow, CurrentTime);
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if (iReturn == BadAtom || iReturn == BadWindow) {
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winErrorFVerb(1, "winClipboardWindowProc - WM_RENDER*FORMAT - "
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"XConvertSelection () failed\n");
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break;
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}
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/* Special handling for WM_RENDERALLFORMATS */
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if (message == WM_RENDERALLFORMATS) {
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/* We must open and empty the clipboard */
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/* Close clipboard if we have it open already */
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if (GetOpenClipboardWindow() == hwnd) {
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CloseClipboard();
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}
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if (!OpenClipboard(hwnd)) {
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winErrorFVerb(1, "winClipboardWindowProc - WM_RENDER*FORMATS - "
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"OpenClipboard () failed: %08x\n",
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GetLastError());
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break;
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}
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if (!EmptyClipboard()) {
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winErrorFVerb(1, "winClipboardWindowProc - WM_RENDER*FORMATS - "
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"EmptyClipboard () failed: %08x\n",
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GetLastError());
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break;
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}
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}
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/* Process the SelectionNotify event */
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iReturn = winProcessXEventsTimeout(hwnd,
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iWindow,
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pDisplay,
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fConvertToUnicode, WIN_POLL_TIMEOUT);
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/*
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* The last call to winProcessXEventsTimeout
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* from above had better have seen a notify event, or else we
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* are dealing with a buggy or old X11 app. In these cases we
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* have to paste some fake data to the Win32 clipboard to
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* satisfy the requirement that we write something to it.
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*/
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if (WIN_XEVENTS_NOTIFY != iReturn) {
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/* Paste no data, to satisfy required call to SetClipboardData */
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if (g_fUnicodeSupport)
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SetClipboardData(CF_UNICODETEXT, NULL);
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SetClipboardData(CF_TEXT, NULL);
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ErrorF
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("winClipboardWindowProc - timed out waiting for WIN_XEVENTS_NOTIFY\n");
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}
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/* Special handling for WM_RENDERALLFORMATS */
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if (message == WM_RENDERALLFORMATS) {
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/* We must close the clipboard */
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if (!CloseClipboard()) {
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winErrorFVerb(1,
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"winClipboardWindowProc - WM_RENDERALLFORMATS - "
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"CloseClipboard () failed: %08x\n",
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GetLastError());
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break;
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}
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}
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winDebug("winClipboardWindowProc - WM_RENDER*FORMAT - Returning.\n");
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return 0;
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}
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}
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/* Let Windows perform default processing for unhandled messages */
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return DefWindowProc(hwnd, message, wParam, lParam);
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}
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/*
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* Process any pending Windows messages
|
|
*/
|
|
|
|
BOOL
|
|
winClipboardFlushWindowsMessageQueue(HWND hwnd)
|
|
{
|
|
MSG msg;
|
|
|
|
/* Flush the messaging window queue */
|
|
/* NOTE: Do not pass the hwnd of our messaging window to PeekMessage,
|
|
* as this will filter out many non-window-specific messages that
|
|
* are sent to our thread, such as WM_QUIT.
|
|
*/
|
|
while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
|
|
/* Dispatch the message if not WM_QUIT */
|
|
if (msg.message == WM_QUIT)
|
|
return FALSE;
|
|
else
|
|
DispatchMessage(&msg);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|