357 lines
19 KiB
HTML
357 lines
19 KiB
HTML
<html>
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<head>
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<title>The Official FVWM Homepage - Fvwm-to-Module Communication</title>
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</head>
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<body BACKGROUND="black-stone1.jpg"
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bgcolor="#000000" text="#ffffff"
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link="#FFFF88" vlink="#EEDDDD" alink="#ff0000">
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<center>
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<h1><font color="pink">The Official FVWM Homepage - Fvwm-to-Module Communication</font></h1>
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</center>
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<H2> <font color="turquoise">When communication takes place</font></h2>
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Fvwm
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can send messages to the modules in either a broadcast mode, or a
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module specific mode. Certain messages regarding important window or
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desktop manipulations are broadcast to all modules, whether they
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want it or not. Modules are able to request information about current windows
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from fvwm, via the Send_WindowList built-in. When invoked this way,
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only requesting module receives the data.
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<H2> <font color="turquoise">Communication packet format</font></h2>
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Packets from fvwm to modules conform to a standard format, so modules
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which are not interested in broadcast messages can easily ignore them.
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A header consisting of 4 unsigned long integers, followed by a body of
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a variable length make up a packet. The header always begins with
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0xffffffff. This is provided to help modules re-synchronize to the
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data stream if necessary. The next entry describes the packet type.
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Existing packet types are listed in the file fvwm/module.h:
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<font color="yellow"><PRE>
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#define <A href="#M_NEW_PAGE">M_NEW_PAGE</A> (1)
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#define <A href="#M_NEW_DESK">M_NEW_DESK</A> (1<<1)
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#define <A href="#M_ADD_WINDOW">M_ADD_WINDOW</A> (1<<2)
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#define <A href="#M_RAISE_WINDOW">M_RAISE_WINDOW</A> (1<<3)
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#define <A href="#M_LOWER_WINDOW">M_LOWER_WINDOW</A> (1<<4)
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#define <A href="#M_CONFIGURE_WINDOW">M_CONFIGURE_WINDOW</A> (1<<5)
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#define <A href="#M_FOCUS_CHANGE">M_FOCUS_CHANGE</A> (1<<6)
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#define <A href="#M_DESTROY_WINDOW">M_DESTROY_WINDOW</A> (1<<7)
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#define <A href="#M_ICONIFY">M_ICONIFY</A> (1<<8)
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#define <A href="#M_DEICONIFY">M_DEICONIFY</A> (1<<9)
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#define <A href="#M_WINDOW_NAME">M_WINDOW_NAME</A> (1<<10)
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#define <A href="#M_ICON_NAME">M_ICON_NAME</A> (1<<11)
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#define <A href="#M_RES_CLASS">M_RES_CLASS</A> (1<<12)
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#define <A href="#M_RES_NAME">M_RES_NAME</A> (1<<13)
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#define <A href="#M_END_WINDOWLIST">M_END_WINDOWLIST</A> (1<<14)
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#define <A href="#M_ICON_LOCATION">M_ICON_LOCATION</A> (1<<15)
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#define <A href="#M_MAP">M_MAP</A> (1<<16)
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#define <A href="#M_ERROR">M_ERROR</A> (1<<17)
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#define <A href="#M_CONFIG_INFO">M_CONFIG_INFO</A> (1<<18)
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#define <A href="#M_END_CONFIG_INFO">M_END_CONFIG_INFO</A> (1<<19)
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#define <A href="#M_ICON_FILE">M_ICON_FILE</A> (1<<20)
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#define <A href="#M_DEFAULTICON">M_DEFAULTICON</A> (1<<21)
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#define <A href="#M_STRING">M_STRING</A> (1<<22)
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#define <A href="#M_MINI_ICON">M_MINI_ICON</A> (1<<23)
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#define <A href="#M_WINDOWSHADE">M_WINDOWSHADE</A> (1<<24)
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#define <A href="#M_DEWINDOWSHADE">M_DEWINDOWSHADE</A> (1<<25)
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#define <A href="#M_LOCKONSEND">M_LOCKONSEND</A> (1<<26)
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#define <A href="#M_SENDCONFIG">M_SENDCONFIG</A> (1<<27)
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</PRE></font>
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<P>
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Additional packet types will be defined in the future. The third entry
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in the header tells the total length of the packet, in unsigned longs,
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including the header. The fourth entry is the last time stamp received
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from the X server, which is expressed in milliseconds.
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<P>
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The body information is packet specific, as described below.
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<H2><A NAME="M_NEW_PAGE">M_NEW_PAGE</A></H2>
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<P>
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These packets contain 5 integers. The first two are the x and y
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coordinates of the upper left corner of the current viewport on the
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virtual desktop. The third value is the number of the current desktop.
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The fourth and fifth values are the maximum allowed values of the
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coordinates of the upper-left hand corner of the viewport.
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<P>
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<H2><A NAME="M_NEW_DESK">M_NEW_DESK</A></H2>
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<P>
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The body of this packet consists of a single long integer, whose value
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is the number of the currently active desktop. This packet is
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transmitted whenever the desktop number is changed.
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<P>
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<H2><A NAME="M_ADD_WINDOW">M_ADD_WINDOW</A>, and <A NAME="M_CONFIGURE_WINDOW">M_CONFIGURE_WINDOW</A></H2>
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<P>
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These packets contain 24 values. The first 3 identify the window, and
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the next twelve identify the location and size, as described in the
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table below. Configure packets will be generated when the
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viewport on the current desktop changes, or when the size or location
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of the window is changed. The flags field is an bitwise OR of the
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flags defined in fvwm.h.
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<P>
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<P><DIV ALIGN=CENTER><P ALIGN=CENTER><TABLE COLS=2 BORDER FRAME=BOX RULES=GROUPS>
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<COLGROUP><COL ALIGN=LEFT><COLGROUP><COL ALIGN=LEFT>
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<TBODY>
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<TR><TD VALIGN=BASELINE ALIGN=CENTER NOWRAP COLSPAN=2>
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Format for Add and Configure Window Packets</TD></TR>
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</TBODY><TBODY>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>Byte </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>Significance </TD></TR>
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</TBODY><TBODY>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>0 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> 0xffffffff - Start of packet </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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1 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> packet type </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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2 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> length of packet, including header, expressed in long integers
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</TD></TR>
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</TBODY><TBODY>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>3 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> ID of the application's top level window </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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4 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> ID of the Fvwm frame window </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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5 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Pointer to the Fvwm database entry </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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6 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> X location of the window's frame </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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7 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Y location of the window's frame</TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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8 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Width of the window's frame (pixels) </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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9 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Height of the window's frame (pixels) </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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10 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Desktop number</TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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11 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Windows flags field</TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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12 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Window Title Height (pixels) </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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13 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Window Border Width (pixels) </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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14 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Window Base Width (pixels) </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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15 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Window Base Height (pixels) </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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16 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Window Resize Width Increment(pixels) </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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17 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Window Resize Height Increment (pixels) </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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18 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Window Minimum Width (pixels) </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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19 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Window Minimum Height (pixels) </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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20 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Window Maximum Width Increment(pixels) </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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21 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Window Maximum Height Increment (pixels) </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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22 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Icon Label Window ID, or 0</TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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23 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Icon Pixmap Window ID, or 0</TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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24 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Window Gravity</TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> \
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25 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Pixel value of the text color </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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26 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Pixel value of the window border color </TD></TR>
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</TBODY>
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</TABLE>
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</P></DIV><P><H2>
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<A NAME="M_LOWER_WINDOW">M_LOWER_WINDOW</A>,
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<A NAME="M_RAISE_WINDOW">M_RAISE_WINDOW</A>, and
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<A NAME="M_DESTROY_WINDOW">M_DESTROY_WINDOW</A>
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</H2>
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<P>
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These packets contain 3 values, all of the same size as an unsigned
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long. The first value is the ID of the affected application's top level
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window, the next is the ID of the Fvwm frame window, and the final
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value is the pointer to Fvwm's internal database entry for that
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window. Although the pointer itself is of no use to a module, it can
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be used as a reference number when referring to the window.
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<P>
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<P><DIV ALIGN=CENTER><P ALIGN=CENTER><TABLE COLS=2 BORDER FRAME=BOX RULES=GROUPS>
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<COLGROUP><COL ALIGN=LEFT><COLGROUP><COL ALIGN=LEFT>
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<TBODY>
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<TR><TD VALIGN=BASELINE ALIGN=CENTER NOWRAP COLSPAN=2>
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Format for Lower, Raise, and Focus Change Packets</TD></TR>
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</TBODY><TBODY>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>Byte </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>Significance </TD></TR>
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</TBODY><TBODY>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>0 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> 0xffffffff - Start of packet </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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1 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> packet type </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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2 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> length of packet, including header, expressed in long integers
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</TD></TR>
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</TBODY><TBODY>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>3 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> ID of the application's top level window </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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4 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> ID of the Fvwm frame window </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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5 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Pointer to the Fvwm database entry </TD></TR>
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</TBODY>
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</TABLE>
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</P></DIV><P><H2><A NAME="M_FOCUS_CHANGE">M_FOCUS_CHANGE</A></H2>
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<P>
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These packets contain 5 values, all of the same size as an unsigned
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long. The first value is the ID of the affected application's (the
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application which now has the input focus) top level
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window, the next is the ID of the Fvwm frame window, and the final
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value is the pointer to Fvwm's internal database entry for that
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window. Although the pointer itself is of no use to a module, it can
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be used as a reference number when referring to the window. The fourth
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and fifth values are the text focus color's pixel value and the window
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border's focus color's pixel value. In the
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event that the window which now has the focus is not a window which
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fvwm recognizes, only the ID of the affected application's top level
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window is passed. Zeros are passed for the other values.
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<P>
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<H2>
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<A NAME="M_ICONIFY">M_ICONIFY</A> and
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<A NAME="M_ICON_LOCATION">M_ICON_LOCATION</A>
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</H2>
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<P>
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These packets contain up to 11 values. The first 3 are the usual identifiers,
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and the next four describe the location and size of the window being iconified,
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as described in the table.
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Under the conditons where an actual builtin icon is created or destroyed,
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the next 4 values describe the location and size of the icon.
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Note that M_ICONIFY packets are sent
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whenever a window is first iconified, or when the icon window is changed
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via the XA_WM_HINTS in a property notify event. An M_ICON_LOCATION
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packet will be sent when the icon is moved.
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In addition, if a window which has transients is
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iconified, then an M_ICONIFY packet is sent for each transient
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window, with the x, y, width, and height fields set to 0. This packet
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will be sent even if the transients were already iconified. Note that
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no icons are actually generated for the transients in this case.
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<P>
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<P><DIV ALIGN=CENTER><P ALIGN=CENTER><TABLE COLS=2 BORDER FRAME=BOX RULES=GROUPS>
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<COLGROUP><COL ALIGN=LEFT><COLGROUP><COL ALIGN=LEFT>
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<TBODY>
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<TR><TD VALIGN=BASELINE ALIGN=CENTER NOWRAP COLSPAN=2>
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Format for Iconify and Icon Location Packets</TD></TR>
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</TBODY><TBODY>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>Byte </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>Significance </TD></TR>
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</TBODY><TBODY>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>0 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> 0xffffffff - Start of packet </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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1 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> packet type </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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2 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> length of packet, including header, expressed in long integers
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</TD></TR>
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</TBODY><TBODY>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>3 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> ID of the application's top level window </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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4 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> ID of the Fvwm frame window </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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5 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Pointer to the Fvwm database entry </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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6 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> X location of the window's frame </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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7 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Y location of the window's frame</TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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8 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Width of the window's frame </TD></TR>
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<TR><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP>
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9 </TD><TD VALIGN=BASELINE ALIGN=LEFT NOWRAP> Height of the window's frame </TD></TR>
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</TBODY>
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</TABLE>
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</P></DIV><P><H2><A NAME="M_DEICONIFY">M_DEICONIFY</A></H2>
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<P>
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These packets contain up to 11 values, starting with the usual window
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identifiers. The packet is sent when a window is de-iconified.
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Like M_ICONIFY, window and icon location and size are sent except
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that icon information comes first followed by window information.
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<P>
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<H2><A NAME="M_MAP">M_MAP</A></H2>
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<P>
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These packets contain 3 values, which are the usual window
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identifiers. The packets are sent when a window is mapped, if it is
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not being deiconified. This is useful to determine when a window is
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finally mapped, after being added.
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<P>
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<H2>
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<A NAME="M_WINDOW_NAME">M_WINDOW_NAME</A>,
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<A NAME="M_ICON_NAME">M_ICON_NAME</A>,
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<A NAME="M_RES_CLASS">M_RES_CLASS</A>,
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<A NAME="M_RES_NAME">M_RES_NAME</A>,
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</H2>
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<P>
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These packets contain 3 values, which are the usual window
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identifiers, followed by a variable length character string. The
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packet size field in the header is expressed in units of unsigned
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longs, and the packet is zero-padded until it is the size of an
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unsigned long. The RES_CLASS and RES_NAME fields are fields in the
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XClass structure for the window. Icon and Window name packets will
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will be sent upon window creation or whenever the name is changed. The
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RES_CLASS and RES_NAME packets are sent on window creation. All
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packets are sent in response to a Send_WindowList request from a module.
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<P>
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<H2><A NAME="M_END_WINDOWLIST">M_END_WINDOWLIST</A></H2>
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<P>
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These packets contain no values. This packet is sent to mark the end
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of transmission in response to a Send_WindowList request. A module
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which request Send_WindowList, and processes all packets received
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between the request and the M_END_WINDOWLIST will have a snapshot of
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the status of the desktop.
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<P>
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<H2><A NAME="M_ERROR">M_ERROR</A></H2>
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<P>
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When fvwm has an error message to report, it is echoed to the modules
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in a packet of this type. This packet has 3 values, all zero, followed
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by a variable length string which contains the error message.
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<P>
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<H2><A NAME="M_CONFIG_INFO">M_CONFIG_INFO</A></H2>
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<P>
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Fvwm records all configuration commands that it encounters which
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begins with the character ``*''. When the built-in command
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``Send_ConfigInfo'' is invoked by a module, this entire list is
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transmitted to the module in packets (one line per packet) of this
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type. The packet consists of three zeros, followed by a variable
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length character string. In addition, the PixmapPath, IconPath, and
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ClickTime are sent to the module.
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<P>
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Note that all the module configuration commands are sent. Each
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module has to check the configuration commands to see if
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it is a command for that specific module. This is actually
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a feature. This way one module can learn about all other
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modules configurations. Also fvwm2 doesn't currently know
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anything about module aliases so all module configuration
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commands have to be sent for at least 2 reasons.
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It is unlikely that this behavior will ever change.
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<P>
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Starting with release 2.0.47, a module can set M_SENDCONFIG on in its
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mask and recieve M_CONFIG_INFO packets while it is running.
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(M_CONFIG_INFO has to be on also.) A module can use M_SENDCONFIG
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to be able to change configuration while it is running.
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Refer to module FvwmAnimate for an example.
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<P>
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<H2><A NAME="M_END_CONFIG_INFO">M_END_CONFIG_INFO</A></H2>
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<P>
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After fvwm sends all of its M_CONFIG_INFO packets to a module, it
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sends a packet of this type to indicate the end of the configuration
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information. This packet contains no values.
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This packet it not sent for subsequent config lines sent when the
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M_SENDCONFIG mask bit is on.
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<H2><A NAME="M_ICON_FILE">M_ICON_FILE</A></H2>
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This packet is broadcast when a window is added or during
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send window list. It is only sent for windows that have icons
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defined, and contains the filename of the icon.
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<H2><A NAME="M_DEFAULTICON">M_DEFAULTICON</A></H2>
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This packet is sent during
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send window list. This is the icon associated with Style "*".
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The packet contains the filename of the icon.
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<H2><A NAME="M_STRING">M_STRING</A></H2>
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This packet is sent when a "SendToModule" command is processed.
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<H2><A NAME="M_MINI_ICON">M_MINI_ICON</A></H2>
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This packet is broadcast when a window is added or during
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send window list. It is only sent for windows that have mini_icons
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|
defined, and contains the filename of the mini_icon.
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<H2><A NAME="M_WINDOWSHADE">M_WINDOWSHADE</A> and
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<A NAME="M_DEWINDOWSHADE">M_DEWINDOWSHADE</A>
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</H2>
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This packet is sent when a window is window shaded.
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It contains no additional information.
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<H2><A NAME="M_LOCKONSEND">M_LOCKONSEND</A></H2>
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This is a request sent from modules to fvwm and is described
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under <a href="mod_m2f_communication.html">Module to Fvwm communication</a>.
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<H2><A NAME="M_SENDCONFIG">M_SENDCONFIG</A></H2>
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This is a request sent from modules to fvwm and is described
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under <a href="mod_m2f_communication.html">Module to Fvwm communication</a>.
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<P>
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<hr>
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</body>
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</html>
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