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/*
* Copyright © 2008 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Authors: Peter Hutterer
*
*/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include <X11/X.h>
#include "windowstr.h"
#include "enterleave.h"
/**
* @return The window that is the first ancestor of both a and b.
*/
WindowPtr
CommonAncestor(
WindowPtr a,
WindowPtr b)
{
for (b = b->parent; b; b = b->parent)
if (IsParent(b, a)) return b;
return NullWindow;
}
/**
* Send enter notifies to all parent windows up to ancestor.
* This function recurses.
*/
static void
EnterNotifies(DeviceIntPtr pDev,
WindowPtr ancestor,
WindowPtr child,
int mode,
int detail)
{
WindowPtr parent = child->parent;
if (ancestor == parent)
return;
EnterNotifies(pDev, ancestor, parent, mode, detail);
EnterLeaveEvent(pDev, EnterNotify, mode, detail, parent,
child->drawable.id);
}
/**
* Send leave notifies to all parent windows up to ancestor.
* This function recurses.
*/
static void
LeaveNotifies(DeviceIntPtr pDev,
WindowPtr child,
WindowPtr ancestor,
int mode,
int detail)
{
WindowPtr pWin;
if (ancestor == child)
return;
for (pWin = child->parent; pWin != ancestor; pWin = pWin->parent)
{
EnterLeaveEvent(pDev, LeaveNotify, mode, detail, pWin,
child->drawable.id);
child = pWin;
}
}
/**
* Figure out if enter/leave events are necessary and send them to the
* appropriate windows.
*
* @param fromWin Window the sprite moved out of.
* @param toWin Window the sprite moved into.
*/
void
DoEnterLeaveEvents(DeviceIntPtr pDev,
WindowPtr fromWin,
WindowPtr toWin,
int mode)
{
if (!IsPointerDevice(pDev))
return;
if (fromWin == toWin)
return;
if (IsParent(fromWin, toWin))
{
EnterLeaveEvent(pDev, LeaveNotify, mode, NotifyInferior, fromWin,
None);
EnterNotifies(pDev, fromWin, toWin, mode,
NotifyVirtual);
EnterLeaveEvent(pDev, EnterNotify, mode, NotifyAncestor, toWin, None);
}
else if (IsParent(toWin, fromWin))
{
EnterLeaveEvent(pDev, LeaveNotify, mode, NotifyAncestor, fromWin,
None);
LeaveNotifies(pDev, fromWin, toWin, mode, NotifyVirtual);
EnterLeaveEvent(pDev, EnterNotify, mode, NotifyInferior, toWin, None);
}
else
{ /* neither fromWin nor toWin is descendent of the other */
WindowPtr common = CommonAncestor(toWin, fromWin);
/* common == NullWindow ==> different screens */
EnterLeaveEvent(pDev, LeaveNotify, mode, NotifyNonlinear, fromWin,
None);
LeaveNotifies(pDev, fromWin, common, mode, NotifyNonlinearVirtual);
EnterNotifies(pDev, common, toWin, mode, NotifyNonlinearVirtual);
EnterLeaveEvent(pDev, EnterNotify, mode, NotifyNonlinear, toWin,
None);
}
}
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