'Some problem about writing a x driver'

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List:       freedesktop-xorg
Subject:    Some problem about writing a x driver
From:       "antilife" <bamboo9527 () gmail ! com>
Date:       2007-12-29 12:15:42
Message-ID: 002c01c84a14$8d85b2d0$3601a8c0 () lgw3dce7a2070b
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x driver:
......
......
xf86PostMotionEvent(device, 1, 0, 3, x, y, p);//for example: x=50,y=100

user program:
use xlib to fetch motion event:

XEvent event;
XNextEvent(disp, &event);
...
XDeviceMotionEvent *me = (XDeviceMotionEvent*)&event;
x = me->axis_data[0];//x=50
y = me->axis_data[1];//y=100

I get the correct values.

But use gtk, i get the wrong values:

static gint 
motion_notify_event(GtkWidget *widget, GdkEventMotion *event)
{
...
x = event->x;// x less than the xf86PostMotionEvent'x
y = event->y;// y less than the xf86PostMotionEvent'y
...
return TRUE;
}
Anybody who can tell me the truth? many thanks...
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<DIV><FONT face=宋体 size=2>x driver:</FONT></DIV>
<DIV><FONT face=宋体 size=2>......</FONT></DIV>
<DIV><FONT face=宋体 size=2>......</FONT></DIV>
<DIV><FONT face=宋体 size=2>xf86PostMotionEvent(device, 1, 0, 3, x, y, p);//for 
example: x=50,y=100</FONT></DIV>
<DIV><FONT face=宋体 size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=宋体 size=2>user program:</FONT></DIV>
<DIV><FONT face=宋体 size=2>use xlib to fetch motion event:</FONT></DIV>
<DIV><FONT face=宋体 size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=宋体 size=2>XEvent event;</FONT></DIV>
<DIV><FONT face=宋体 size=2>XNextEvent(disp, &amp;event);</FONT></DIV>
<DIV><FONT face=宋体 size=2>...</FONT></DIV>
<DIV><FONT face=宋体 size=2>XDeviceMotionEvent *me = 
(XDeviceMotionEvent*)&amp;event;</FONT></DIV>
<DIV><FONT face=宋体 size=2>x = me-&gt;axis_data[0];//x=50</FONT></DIV>
<DIV><FONT face=宋体 size=2>y = me-&gt;axis_data[1];//y=100</FONT></DIV>
<DIV><FONT face=宋体 size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=宋体 size=2>I&nbsp;get the correct values.</FONT></DIV>
<DIV><FONT face=宋体 size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=宋体 size=2>But use gtk, i&nbsp;get the wrong values:</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=宋体 size=2>static gint </FONT></DIV>
<DIV><FONT face=宋体 size=2>motion_notify_event(GtkWidget *widget, GdkEventMotion 
*event)<BR>{<BR>...</FONT></DIV>
<DIV><FONT face=宋体 size=2>x = event-&gt;x;// x less than the 
xf86PostMotionEvent'x</FONT></DIV>
<DIV><FONT face=宋体 size=2>y = event-&gt;y;// y less than the 
xf86PostMotionEvent'y<BR>...<BR>return TRUE;<BR>}<BR>Anybody who can tell me the 
truth? many thanks...</DIV></FONT></BODY></HTML>

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