Add clipboard support for X11.
git-svn-id: svn+ssh://svn.gna.org/svn/warzone/trunk@5890 4a71c877-e1ca-e34f-864e-861f7616d084master
Freddie Witherden
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c8beeaff83
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0f46539a45
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/*
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This file is part of Warzone 2100.
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Copyright (C) 2008 Freddie Witherden
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Copyright (C) 2008 Warzone Resurrection Project
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Warzone 2100 is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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Warzone 2100 is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Warzone 2100; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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// Something wicked this way comes...
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#include <stdbool.h>
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#include <assert.h>
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#include <SDL_syswm.h>
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#include <SDL.h>
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static SDL_SysWMinfo info;
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static Atom clipboardAtom;
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static Atom compoundTextAtom;
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static Atom utf8StringAtom;
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static Atom targetsAtom;
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/**
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* Filters through SDL_Events searching for clipboard requests from the X
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* server.
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*
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* @param evt The event to filter.
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*/
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static int widgetClipboardFilterX11(const SDL_Event *evt)
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{
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// We are only interested in window manager events
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if (evt->type == SDL_SYSWMEVENT)
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{
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XEvent xevent = evt->syswm.msg->event.xevent;
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// See if the event is a selection/clipboard request
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if (xevent.type == SelectionRequest)
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{
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// Get the request in question
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XSelectionRequestEvent *request = &xevent.xselectionrequest;
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// Generate a reply to the selection request
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XSelectionEvent reply;
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reply.type = SelectionNotify;
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reply.serial = xevent.xany.send_event;
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reply.send_event = True;
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reply.display = info.info.x11.display;
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reply.requestor = request->requestor;
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reply.selection = request->selection;
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reply.property = request->property;
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reply.target = None;
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reply.time = request->time;
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printf("It is: %s\n", XGetAtomName(info.info.x11.display, request->target));
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// They want to know what we can provide/offer
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if (request->target == targetsAtom)
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{
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Atom possibleTargets[] =
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{
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XA_STRING,
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utf8StringAtom,
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compoundTextAtom
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};
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XChangeProperty(info.info.x11.display, request->requestor,
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request->property, XA_ATOM, 32, PropModeReplace,
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(unsigned char *) possibleTargets, 3);
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}
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// They want a string (all we can provide)
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else if (request->target == XA_STRING
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|| request->target == utf8StringAtom
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|| request->target == compoundTextAtom)
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{
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int len;
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char *xdata = XFetchBytes(info.info.x11.display, &len);
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XChangeProperty(info.info.x11.display, request->requestor,
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request->property, request->target, 8,
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PropModeReplace, (unsigned char *) xdata,
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len);
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XFree(xdata);
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}
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else
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{
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// Did not have what they wanted, so no property set
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reply.property = None;
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}
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// Dispatch the event
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XSendEvent(request->display, request->requestor, 0, NoEventMask,
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(XEvent *) &reply);
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XSync(info.info.x11.display, False);
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}
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}
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return 1;
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}
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static void widgetInitialiseClipboardX11()
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{
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static bool initialised = false;
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if (!initialised)
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{
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// Make sure we have not already been initialised
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assert(initialised == false);
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// Get the window manager information
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SDL_GetWMInfo(&info);
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// Ensure we're running under X11
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assert(info.subsystem == SDL_SYSWM_X11);
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// Register the event filter
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SDL_EventState(SDL_SYSWMEVENT, SDL_ENABLE);
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SDL_SetEventFilter(widgetClipboardFilterX11);
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// Lock the connection to the X server
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info.info.x11.lock_func();
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// Get the clipboard atom (it is not defined by default)
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clipboardAtom = XInternAtom(info.info.x11.display, "CLIPBOARD", True);
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// Get the compound text type atom
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compoundTextAtom = XInternAtom(info.info.x11.display, "COMPOUND_TEXT",
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True);
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// UTF-8 string atom
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utf8StringAtom = XInternAtom(info.info.x11.display, "UTF8_STRING",
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True);
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// TARGETS atom
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targetsAtom = XInternAtom(info.info.x11.display, "TARGETS", True);
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// Unlock the connection
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info.info.x11.unlock_func();
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// We are initialised
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initialised = true;
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}
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}
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char *widgetGetClipboardText()
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{
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char *text = NULL;
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unsigned char *data = NULL;
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Atom type;
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int format, result;
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unsigned long len, bytesLeft, dummy;
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Window selectionOwner;
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// Make sure we are initialised
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widgetInitialiseClipboardX11();
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// Lock the connection
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info.info.x11.lock_func();
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// Get the owner of the clipboard selection
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selectionOwner = XGetSelectionOwner(info.info.x11.display, clipboardAtom);
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// If there is a selection (and therefore owner) fetch it
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if (selectionOwner != None)
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{
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// Convert the selection to a string
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XConvertSelection(info.info.x11.display, clipboardAtom, XA_STRING, None,
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selectionOwner, CurrentTime);
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XFlush(info.info.x11.display);
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// See how much data is there
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XGetWindowProperty(info.info.x11.display, selectionOwner, XA_STRING, 0,
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0, False, AnyPropertyType, &type, &format, &len,
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&bytesLeft, &data);
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// If any 0-length data was returned, free it
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if (data)
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{
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XFree(data);
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data = NULL;
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}
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// If there is any data
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if (bytesLeft)
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{
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result = XGetWindowProperty(info.info.x11.display, selectionOwner,
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XA_STRING, 0, bytesLeft, False,
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AnyPropertyType, &type, &format, &len,
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&dummy, &data);
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// If we got some data, duplicate it
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if (result == Success)
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{
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text = strdup((char *) data);
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XFree(data);
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}
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}
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// Delete the property now that we are finished with it
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XDeleteProperty(info.info.x11.display, selectionOwner, XA_STRING);
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}
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// Unlock the connection
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info.info.x11.unlock_func();
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return text;
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}
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bool widgetSetClipboardText(const char *text)
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{
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Window selectionOwner;
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// Make sure we are initialised
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widgetInitialiseClipboardX11();
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// Lock the connection
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info.info.x11.lock_func();
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// Copy the text into the root windows cut buffer (for Xterm compatibility)
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XStoreBytes(info.info.x11.display, text, strlen(text) + 1);
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// Set ourself as the owner of the CLIPBOARD atom
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XSetSelectionOwner(info.info.x11.display, clipboardAtom,
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info.info.x11.window, CurrentTime);
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// Check if we acquired ownership or not
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selectionOwner = XGetSelectionOwner(info.info.x11.display, clipboardAtom);
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// We got ownership
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if (selectionOwner == info.info.x11.window)
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{
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info.info.x11.unlock_func();
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return true;
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}
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// We did not get ownership
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else
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{
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info.info.x11.unlock_func();
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return false;
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}
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}
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