Pointer.c revision a3bd7f05 
1/********************************************************
2
3Copyright 1988 by Hewlett-Packard Company
4Copyright 1987, 1988, 1989 by Digital Equipment Corporation, Maynard
5
6Permission to use, copy, modify, and distribute this software
7and its documentation for any purpose and without fee is hereby
8granted, provided that the above copyright notice appear in all
9copies and that both that copyright notice and this permission
10notice appear in supporting documentation, and that the names of
11Hewlett-Packard or Digital not be used in advertising or
12publicity pertaining to distribution of the software without specific,
13written prior permission.
14
15DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
16ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
17DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
18ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
19WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
20ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
21SOFTWARE.
22
23********************************************************/
24
25/*
26
27Copyright 1987, 1988, 1989, 1998  The Open Group
28
29Permission to use, copy, modify, distribute, and sell this software and its
30documentation for any purpose is hereby granted without fee, provided that
31the above copyright notice appear in all copies and that both that
32copyright notice and this permission notice appear in supporting
33documentation.
34
35The above copyright notice and this permission notice shall be included in
36all copies or substantial portions of the Software.
37
38THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
39IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
40FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
41OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
42AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
43CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
44
45Except as contained in this notice, the name of The Open Group shall not be
46used in advertising or otherwise to promote the sale, use or other dealings
47in this Software without prior written authorization from The Open Group.
48
49*/
50
51#ifdef HAVE_CONFIG_H
52#include <config.h>
53#endif
54#include "IntrinsicI.h"
55#include "PassivGraI.h"
56
57#define AllButtonsMask (Button1Mask | Button2Mask | Button3Mask | Button4Mask | Button5Mask)
58
59Widget
60_XtProcessPointerEvent(XButtonEvent *event,
61                       Widget widget,
62                       XtPerDisplayInput pdi)
63{
64    XtDevice device = &pdi->pointer;
65    XtServerGrabPtr newGrab = NULL, devGrab = &device->grab;
66    Widget dspWidget = NULL;
67    Boolean deactivateGrab = FALSE;
68
69    switch (event->type) {
70    case ButtonPress:
71    {
72        if (!IsServerGrab(device->grabType)) {
73            Cardinal i;
74
75            for (i = (Cardinal) pdi->traceDepth; i > 0 && !newGrab; i--)
76                newGrab = _XtCheckServerGrabsOnWidget((XEvent *) event,
77                                                      pdi->trace[i - 1],
78                                                      POINTER);
79        }
80        if (newGrab) {
81            /* Activate the grab */
82            device->grab = *newGrab;
83            device->grabType = XtPassiveServerGrab;
84        }
85    }
86        break;
87
88    case ButtonRelease:
89    {
90        if ((device->grabType == XtPassiveServerGrab) &&
91            !(event->state & (unsigned) (~(Button1Mask << (event->button - 1)))
92              & AllButtonsMask))
93            deactivateGrab = TRUE;
94    }
95        break;
96    }
97
98    if (IsServerGrab(device->grabType) && !(devGrab)->ownerEvents)
99        dspWidget = (devGrab)->widget;
100    else
101        dspWidget = widget;
102
103    if (deactivateGrab)
104        device->grabType = XtNoServerGrab;
105
106    return dspWidget;
107}
108