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    Names: »Sx_MenuCreate«

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TextFile

.TH Sx_MenuCreate sx
.BS
.NA
Sx_MenuCreate \- create a pull-down menu
.SY
#include <X/Xlib.h>
#include <sx.h>
.sp
Window
Sx_MenuCreate(\fIparent, name, numEntries, entries, fontPtr, foreground, background\fP)
.AR
.AS Sx_MenuEntry numEntries
.AP Window parent in
Parent window in which to create menu title.
.AP char *name in
Name of menu:  this string will be displayed in the menu's title.
If there is already a menu in \fIparent\fP with this name, it is
replaced with the information provided here.
.AP int numEntries in
Number of entries in the menu.  Must be no greater than SX_MAX_MENU_ENTRIES.
.AP Sx_MenuEntry entries[] in
Array containing \fInumEntries\fP elements, each describing one
menu entry.  Element 0 will be displayed as the topmost selection
in the menu.
.AP FontInfo *fontPtr in
Describes font to be used both for menu title and for menu itself.  If
NULL, the Sx default font is used.
.AP int foreground in
Foreground color:  used for title text, menu text, and menu border.
.AP int background in
Background color:  used for title background, and as default background
color for menu entries that don't specify their own backgrounds.
.BE

.SH DESCRIPTION
.PP
Sx_MenuCreate adds a new menu to those already present in
\fIparent\fP, or replaces an existing menu if there is already
one by the given name.  The menu consists of two windows.  The
first is a child of \fIparent\fP;  it displays the menu's name,
and can be buttoned by the user to pull down the menu.  The
second window displays the menu entries.  It is displayed only
when the user has ``pulled it down'' by buttoning the title
window.  Sx_MenuCreate returns the X id for the title window,
which can be used to destroy the menu or modify it with
procedures like Sx_MenuGetMask and Sx_ReplaceEntry.
.PP
The menu is described by the array \fIentries\fP.  Each element
of the array describes one selection in the pull-down menu, and
has the following structure:
.nf
.RS
typedef struct {
.RS
char *\fIleftText\fP, *\fIcenterText\fP, *\fIrightText\fP;
int \fIbackground\fP;
void (*\fIproc\fP)();
ClientData \fIclientData\fP;
.RE
} Sx_MenuEntry;
.RE
.fi
When the menu is displayed, the three character strings \fIleftText\fP,
\fIcenterText\fP, and \fIrightText\fP will be displayed at the left edge,
center, and right edge (respectively) of the line for this entry.  Any
of the strings may be NULL.  The pull-down menu will be sized large
enough to accomodate all the text from all of its entries.
Normally, the \fIbackground\fP value passed to Sx_MenuCreate is used
as the background color for each entry in the menu;  however, if the
\fIbackground\fP field for any entry is not \-1, then that value is
used as the background for that entry.
\fIProc\fP is the address of a procedure that will be called whenever
the user invokes the entry (the user ``invokes'' the entry by
pressing a mouse button over the menu's title window
moving the pointer over this
entry in the pull-down menu, and releasing the button).  \fIProc\fP must
have the following structure:
.nf
.sp .5
.RS
void
proc(\fIclientData, entry, menuWindow\fP)
.RS
ClientData \fIclientData\fP;
int \fIentry\fP;
Window \fImenuWindow\fP;
.RE
{
}
.RE
.sp .5
.fi
The \fIclientData\fP argument passed to \fIproc\fP is identical to
the \fIclientData\fP value from the menu entry.  Typically, it
points to a data structure of the client's that describes
what command to execute in response to the menu selection.
\fIEntry\fP is the index of the entry that was invoked, and
\fImenuWindow\fP is the X id for the menu title window (which is
the same as the value returned by Sx_MenuCreate).
.PP
In normal usage, \fIparent\fP is a window used only
to hold menu titles.  It typically appears at the top of an application
window, just underneath the window's title.  Its location and size
are typically managed by the Sx packer so that it fills the application
window's width and is just tall enough to contain the font used for
menus.  The menu package allocates space within \fIparent\fP for the
menu titles, packing the titles from left to right in order of creation.
.PP
When a menu is initially created, all of its entries are enabled.
The Sx_MenuSetMask procedure may be used to disable some or all
of the entries.
.PP
If \fIfontPtr\fP is non-NULL, the caller must make sure that the information
it refers to remains valid as long as the menu exists.  On the other hand,
\fIname\fP and the information associated with the menu entries are
copied by the menu package, so they can be destroyed by the caller as
soon as Sx_MenuCreate returns.
.PP
A menu may be deleted by calling XDestroyWindow on the window returned
by Sx_MenuCreate (or any of its ancestors).  When the menu title window
is destroyed, Sx will destroy the menu entry window and clean up all
the internal structures associated with the menu.
.PP
The implementation of menus depends on the use of the Sx
dispatcher (Sx_HandlerCreate, Sx_HandleEvent, etc.), and will
not work if those routines are not used correctly.

.SH KEYWORDS
create, menu, pull-down menu, window