path: root/nx-X11/programs/Xserver/hw/nxagent/NXevents.c

/**************************************************************************/
/*                                                                        */
/* Copyright (c) 2001, 2011 NoMachine (http://www.nomachine.com)          */
/* Copyright (c) 2008-2017 Oleksandr Shneyder <o.shneyder@phoca-gmbh.de>  */
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/* Copyright (c) 2014-2019 Mihai Moldovan <ionic@ionic.de>                */
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Permission is hereby granted, free of charge, to any person obtaining a copy
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#include <nx-X11/Xlib.h>

/* define this to inform dix about having a own implementation of GetXYStartWindow() */
#define XYWINDOWCALLBACK
#include "../../dix/events.c"

#include "compext/Compext.h"

#include "Events.h"
#include "Windows.h"
#include "Args.h"
#include "Clipboard.h"

extern Display *nxagentDisplay;

extern WindowPtr nxagentLastEnteredWindow;

#ifdef VIEWPORT_FRAME
extern void nxagentInitViewportFrame(ScreenPtr, WindowPtr);
#endif
extern int  nxagentShadowInit(ScreenPtr, WindowPtr);

void
ActivatePointerGrab(register DeviceIntPtr mouse, register GrabPtr grab,
                    TimeStamp time, Bool autoGrab)
{
    #ifdef DEBUG
    fprintf(stderr, "%s: called\n", __func__);
    #endif

    xorg_ActivatePointerGrab(mouse, grab, time, autoGrab);

    #ifdef NXAGENT_SERVER

    /*
     * If grab is synchronous, events are delivered to clients only if they send
     * an AllowEvent request. If mode field in AllowEvent request is SyncPointer, the 
     * delivered event is saved in a queue and replayed later, when grab is released.
     * We should export sync grab to X as async in order to avoid events to be
     * queued twice, in the agent and in the X server. This solution have a drawback:
     * replayed events are not delivered to that application that are not clients of
     * the agent.
     * A different solution could be to make the grab asynchronous in the agent and 
     * to export it as synchronous. But this seems to be less safe.
     *
     * To make internal grab asynchronous, change previous line as follows.
     *
     * if (nxagentOption(Rootless))
     * {
     *   CheckGrabForSyncs(mouse, GrabModeAsync, (Bool)grab->keyboardMode);
     * }
     * else
     * {
     *   CheckGrabForSyncs(mouse,(Bool)grab->pointerMode, (Bool)grab->keyboardMode);
     * }
     */

    if (nxagentOption(Rootless))
    {
      /*
       * from nxagent-1.5.0-20 changelog:
       * In rootless mode, grabs exported to X in
       * ActivatePointerGrab() are always made asynchronous. The
       * synchronous behaviour is implemented by the agent, so that
       * requiring a further synchronous grab down to the real X
       * server is of little use and potentially harmful.
       */

      /*
       * FIXME: We should use the correct value for the
       * cursor. Temporarily we set it to None.
       */

       int resource = nxagentWaitForResource(NXGetCollectGrabPointerResource,
                                                 nxagentCollectGrabPointerPredicate);

       NXCollectGrabPointer(nxagentDisplay, resource, nxagentWindow(grab -> window),
                                1, grab -> eventMask & PointerGrabMask,
                                    GrabModeAsync, GrabModeAsync, (grab -> confineTo) ?
                                        nxagentWindow(grab -> confineTo) : None,
                                            None, CurrentTime);
    }

    #endif /* NXAGENT_SERVER */
}

void
DeactivatePointerGrab(register DeviceIntPtr mouse)
{
    #ifdef DEBUG
    fprintf(stderr, "%s: called\n", __func__);
    #endif

    xorg_DeactivatePointerGrab(mouse);

    #ifdef NXAGENT_SERVER

    /*
     * excerpt from nxagent-1.5.0-20 changelog:
     * In DeactivatePointerGrab() function, mouse button state is set
     * to up if the window entered by the pointer is the root window
     * and the agent is in rootless mode. This change is needed
     * because the subsequent KeyRelease event could be not received
     * by the agent (for example if the focus had left the window), so
     * that agent could be unable to update the mouse button state.
     */
    if (nxagentOption(Rootless))
    {
      XUngrabPointer(nxagentDisplay, CurrentTime);

      if (sprite.win == ROOT)
      {
        mouse -> button -> state &=
            ~(Button1Mask | Button2Mask | Button3Mask |
                  Button4Mask | Button5Mask);
      }
    }

    #endif
}

int
ProcAllowEvents(register ClientPtr client)
{
    int rc = xorg_ProcAllowEvents(client);

    if (rc != Success)
        return rc;

    /*
     * This is not necessary if we export grab to X as asynchronous.
     *
     * if (nxagentOption(Rootless) && stuff -> mode != ReplayKeyboard &&
     *         stuff -> mode != SyncKeyboard && stuff -> mode != AsyncKeyboard)
     * {
     *   XAllowEvents(nxagentDisplay, stuff -> mode, CurrentTime);
     * }
     */

    return Success;
}

/*
 * called from XYToWindow to determine where XYToWindow() should start
 * going through the list.
 * XYWINDOWCALLBACK needs to be defined for this to work, see dix/events.c.
 * It is called from XYtoWindow().
 */

static WindowPtr 
GetXYStartWindow(WindowPtr pWin)
{
    if (nxagentOption(Rootless))
    {
      /*
       * explanation from the original changelog for nxagent-1.5.0-20:
       * Modified function XYToWindow() in order to manage the case
       * that mouse pointer is located on the title bar of a top level
       * window in rootless mode.
       */

      if (nxagentLastEnteredWindow == NULL)
      {
        return ROOT;
      }

      /*
       * explanation from the original changelog for nxagent-1.5.0-17:
       * In rootless mode, now function XYToWindow() starts search from
       * the last window originated an EnterNotify event. In this way, we
       * can prevent shaded windows from getting mouse events.
       */
      pWin = ROOT->lastChild;

      while (pWin && pWin != ROOT->firstChild && pWin != nxagentLastEnteredWindow)
      {
        pWin = pWin->prevSib;
      }
    }
    return pWin;
}

static Bool
CheckMotion(xEvent *xE)
{
    WindowPtr prevSpriteWin = sprite.win;

#ifdef PANORAMIX
    if(!noPanoramiXExtension)
	return XineramaCheckMotion(xE);
#endif

    if (xE && !syncEvents.playingEvents)
    {
	if (sprite.hot.pScreen != sprite.hotPhys.pScreen)
	{
	    sprite.hot.pScreen = sprite.hotPhys.pScreen;
	    ROOT = sprite.hot.pScreen->root;
	}
	sprite.hot.x = XE_KBPTR.rootX;
	sprite.hot.y = XE_KBPTR.rootY;
	if (sprite.hot.x < sprite.physLimits.x1)
	    sprite.hot.x = sprite.physLimits.x1;
	else if (sprite.hot.x >= sprite.physLimits.x2)
	    sprite.hot.x = sprite.physLimits.x2 - 1;
	if (sprite.hot.y < sprite.physLimits.y1)
	    sprite.hot.y = sprite.physLimits.y1;
	else if (sprite.hot.y >= sprite.physLimits.y2)
	    sprite.hot.y = sprite.physLimits.y2 - 1;
#ifdef SHAPE
	if (sprite.hotShape)
	    ConfineToShape(sprite.hotShape, &sprite.hot.x, &sprite.hot.y);
#endif
	sprite.hotPhys = sprite.hot;

#ifdef NXAGENT_SERVER
        /*
         * This code forces the cursor position to be inside the root
         * window of the agent. We can't view a reason to do this and
         * it interacts in an undesirable way with toggling
         * fullscreen.
         *
         * if ((sprite.hotPhys.x != XE_KBPTR.rootX) ||
         *          (sprite.hotPhys.y != XE_KBPTR.rootY))
         * {
         *   (*sprite.hotPhys.pScreen->SetCursorPosition)(
         *       sprite.hotPhys.pScreen,
         *           sprite.hotPhys.x, sprite.hotPhys.y, FALSE);
         * }
         */
#else
	if ((sprite.hotPhys.x != XE_KBPTR.rootX) ||
	    (sprite.hotPhys.y != XE_KBPTR.rootY))
	{
	    (*sprite.hotPhys.pScreen->SetCursorPosition)(
		sprite.hotPhys.pScreen,
		sprite.hotPhys.x, sprite.hotPhys.y, FALSE);
	}
#endif
	XE_KBPTR.rootX = sprite.hot.x;
	XE_KBPTR.rootY = sprite.hot.y;
    }

    sprite.win = XYToWindow(sprite.hot.x, sprite.hot.y);
#ifdef notyet
    if (!(sprite.win->deliverableEvents &
	  Motion_Filter(inputInfo.pointer->button))
	!syncEvents.playingEvents)
    {
	/* XXX Do PointerNonInterestBox here */
    }
#endif
    if (sprite.win != prevSpriteWin)
    {
	if (prevSpriteWin != NullWindow) {
	    if (!xE)
		UpdateCurrentTimeIf();
	    DoEnterLeaveEvents(prevSpriteWin, sprite.win, NotifyNormal);
	}
	PostNewCursor();
        return FALSE;
    }
    return TRUE;
}

void
DefineInitialRootWindow(register WindowPtr win)
{
    register ScreenPtr pScreen = win->drawable.pScreen;

    xorg_DefineInitialRootWindow(win);

    #ifdef VIEWPORT_FRAME
    nxagentInitViewportFrame(pScreen, win);
    #endif

    if (nxagentOption(Shadow))
    {
      if (nxagentShadowInit(pScreen, win) == -1)
      {
        FatalError("Failed to connect to display '%s'", nxagentShadowDisplayName);
      }
    }
}

int
ProcSendEvent(ClientPtr client)
{
#ifdef NXAGENT_CLIPBOARD

    REQUEST(xSendEventReq);

    REQUEST_SIZE_MATCH(xSendEventReq);

    if (nxagentOption(Rootless) && stuff->event.u.u.type == ClientMessage)
    {
        ForwardClientMessage(client, stuff);
        return Success;
    }

    if (stuff -> event.u.u.type == SelectionNotify)
    {
        #ifdef DEBUG
        fprintf(stderr, "%s: sending SelectionNotify to ourselves"\n, __func__);
        #endif
        if (nxagentSendNotificationToSelfViaXServer(&stuff->event) == 1)
            return Success;
    }
#endif
    return xorg_ProcSendEvent(client);
}