XmQTdialogShellSavvy(3X) UNIX System V XmQTdialogShellSavvy(3X)
NAME
XmQTdialogShellSavvy - A dialog widget holding this trait
can become a child of the XmDialogShell widget
SYNOPSIS
#include <Xm/DialogSavvyT.h>
typedef struct {
int version;
XmDialogSavvyMapUnmapProc callMapUnmapCB;
} XmDialogSavvyTraitRec,*XmDialogSavvyTrait;
void (*XmDialogSavvyMapUnmapProc)(
Widget,
Boolean);
VERSION
This page documents Motif 2.1.
DESCRIPTION
A widget holding the XmQTdialogSavvy trait can become an
immediate child of the XmDialogShell widget. In other
words, the XmQTdialogSavvy trait announces to the
XmDialogShell widget that your widget is an acceptable
child.
Every dialog widget that holds the XmQTdialogShellSavvy
trait must provide the following:
o A callMapUnmapCB trait method
o A default position resource
o Code that detects an XmDIALOG_SAVVY_FORCE_ORIGIN
situation
Any widget that installs the XmQTdialogShellSavvy trait must
provide a Boolean default position resource. For example,
ExmGrid and XmBulletinBoard both provide a Boolean default
position resource named XmNdefaultPosition. This resource
controls the positioning of the DialogShell managing your
XmQTdialogShellSavvy widget. This resource has no influence
if your XmQTdialogShellSavvywidget is not managed by a
DialogShell. For example, if the parent of the DialogShell
is an ApplicationShell, then the center of the DialogShell
will be at the same coordinates as the center of the
ApplicationShell. If the DialogShell becomes unmapped (but
stays managed) and then remapped, this resource has no
influence on the DialogShell's position. If the default
position resource is False, the DialogShell does not
automatically center itself. Instead, the DialogShell (and
therefore its XmQTdialogShellSavvy child) will be positioned
according to the values of XmNx and XmNy. Motif will treat
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XmQTdialogShellSavvy(3X) UNIX System V XmQTdialogShellSavvy(3X)
the values of XmNx and XmNy as offsets from the upper-left
corner of the screen (rather than as offsets from the
upper-left corner of the parent shell).
The Xm/DialogSavvyT.h header file provides a special macro
constant named XmDIALOG_SAVVY_FORCE_ORIGIN. Any widget
holding the XmQTdialogShellSavvy trait must use this
constant. Here is the problem that
XmDIALOG_SAVVY_FORCE_ORIGIN solves. The current position of
a dialog child widget within an XmDialogShellwidget is
always 0,0. Suppose a user or application calls XtSetValues
to set the dialog child widget's x-coordinate or y-
coordinate to 0. In this case, the Intrinsics will not
detect a geometry change and will therefore not trigger a
geometry request. To tell the XmDialogShell widget that you
really do want the child to move to a coordinate of 0, your
dialog child widget must catch this request and respond to
it by setting the x-coordinate or y-coordinate to
XmDIALOG_SAVVY_FORCE_ORIGIN instead of 0. For example:
if (my_dialog_widget->core.x == 0)
my_dialog_widget->core.x = XmDIALOG_SAVVY_FORCE_ORIGIN;
...
if (my_dialog_widget->core.y == 0)
my_dialog_widget->core.y = XmDIALOG_SAVVY_FORCE_ORIGIN;
In the standard Motif widget set, the XmBulletinBoard widget
and all its subclasses hold the XmQTdialogShellSavvy trait.
In the Exm demonstration widget set, the ExmGrid widget
installs the XmQTdialogShellSavvy trait.
The XmDialogShell widget is the only standard Motif widget
that examines its children for this trait.
The callMapUnmapCB Trait Method
void callMapUnmapCB(
Widget dialogWidget,
Boolean map_unmap);
All dialog widgets holding the XmQTdialogShellSavvy trait
must provide the callMapUnmapCB trait method. The
callMapUnmapCB trait method is responsible for calling the
map or unmap callback of the widget. For example, following
is one possible way of implementing this trait method:
static void
CallMapUnmap(
Widget dialogWidget,
Boolean map_unmap)
{
ExmMyDialogWidget dw = (ExmMyDialogWidget) dialogWidget;
XmAnyCallbackStruct call_data;
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call_data.reason = map_unmap ? XmCR_MAP: XmCR_UNMAP;
call_data.event = NULL;
if (map_unmap)
XtCallCallbackList (dialogWidget, dw->my_dialog.map_callback,
&call_data);
else
XtCallCallbackList (dialogWidget, dw->my_dialog.unmap_callback,
&call_data);
}
dialogWidget
Specifies the dialog widget.
map_unmap Specifies a Boolean value. If this value is True,
then the trait method should invoke the map
callback. If this value is False, then the trait
method should invoke the unmap callback.
RELATED
XmBulletinBoard(3) and XmDialogShell(3).
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