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NAME
XmDropDown — The DropDown widget class
SYNOPSIS
#include <Xm/DropDown.h>
DESCRIPTION
The DropDown widget allows the user to select elements from a list of choices, and enter
their own values in a text widget. To conserve screen space, the list of choices is shown
only when the user selects the down arrow button. The choices may then be selected from
this list. If the list widget is in Browse Select mode (the default) or Single Select
mode, then the list will automatically be removed when the user selects an item in the
list. When the list is in other modes, multiple items may be selected and the list may be
popped down by either another click on the arrow button, a click outside the list or
double-clicking an item. When using keyboard traversal, the list may be popped down by
selecting the arrow button or Alt - down arrow, and popped back up by typing either the
osfActivate key, a carriage return, or Alt - up arrow. In any case, when the list is
removed the item or items that were selected will be placed in the text widget separated
by commas. Typing the escape key when the list is up, cancels the list popup, restoring
the DropDown widget to the state it was in before the list was popped up. If the text
field area is non-editable, clicking anywhere in the text field the list will also pop
down.
Resources are available to change the margin sizes, the location of the left edge of the
popup list, whether or not the label is shown, whether the text field widget may be
edited, and whether or not the text in the list is verified against the choices available
in the list. By setting resources that occur in the children of the DropDown widget, the
contents of the list, the number of items visible in the list, the initial value of the
text field, and the value of the label may be set or changed dynamically.
If a developer wishes the popup list's shell to be resizable, they should set the
allowShellResize to True at creation time.
Classes
XmDropDown inherits behavior, resources, and traits from Core, Composite, and XmManager
classes.
The class pointer is xmDropDownWidgetClass.
The class name is XmDropDown.
New Resources
The following table defines a set of widget resources used by the programmer to specify
data. The programmer can also set the resource values for the inherited classes to set
attributes for this widget. To reference a resource by name or by class in a .Xdefaults
file, remove the XmN or XmC prefix and use the remaining letters. To specify one of the
defined values for a resource in a .Xdefaults file, remove the Xm prefix and use the
remaining letters (in either lowercase or uppercase, but include any underscores between
words). The codes in the access column indicate if the given resource can be at creation
time (C), set by using XtSetValues (S), retrieved by using XtGetValues (G), or is not
applicable (N/A).
┌───────────────────────────────────────────────────────────────────────────────────────┐
│ │ XmDropDown Resource│Set │ │ │
│Name │ Class │ Type │ Default │ Access │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNcustomizedCombinationBox │ XmCBoolean │ Boolean │ False │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNeditable │ XmCBoolean │ Boolean │ True │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNhorizontalMargin │ XmCMargin │ Dimension │ 2 │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNitemCount │ list │ int │ 0 │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNitems │ list │ XmStringTable │ NULL │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNlabelString │ label │ XmString │ "label" │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNpopupCursor │ XmCCursor │ Cursor │ left_ptr │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNpopupOffset │ MxCPopupOffset │ int │ 15 │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNpopupShellWidget │ XmCWidget │ Widget │ NULL │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNshowLabel │ XmCBoolean │ Boolean │ True │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNupdateShellCallback │ XmCCallback │ XtCallbackList │ NULL │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNupdateTextCallback │ XmCCallback │ XtCallbackList │ NULL │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNuseTextField │ XmCUseTextField │ Boolean │ True │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNvalue │ text │ String │ "" │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNverify │ XmCVerify │ Boolean │ True │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNverifyTextCallback │ XmCCallback │ XtCallbackList │ NULL │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNverticalMargin │ XmCMargin │ Dimension │ 2 │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
│XmNvisibleItemCount │ XmCVisibleItemCount │ int │ 0 │ CSG │
├────────────────────────────┼─────────────────────┼────────────────┼──────────┼────────┤
└────────────────────────────┴─────────────────────┴────────────────┴──────────┴────────┘
XmNcustomizedCombinationBox
If this resource is True then the widget will not automatically create a popup
shell and list widget. This resource can be used, as the name implies, to create
a custom combination box that has something other than a list in it. If this
resource is true then a shell must be provided to the DropDown widget via the
popupShellWidget resource. Just before the shell is popped up the
updateShellCallback is called. Just after the shell is popped down the
updateTextCallback is called. If verify is true then the verifyTextCallback is
called when the combo box needs to verify the contents of the text widget
against the allowable values in the custom shell.
XmNeditable
This boolean value determines whether the user is allowed to type into TextField
widget of the DropDown widget. If this value is False, selecting the text field
will popup the combo box list
XmNhorizontalMargin
Specifies the horizontal spacing between the child widgets and the boundary of
the DropDown widget.
XmNverticalMargin
Specifies the vertical spacing between the child widgets and the boundary of the
DropDown widget.
XmNitemCount
The number of items in the popup list.
XmNitems The list of all choice that will be displayed in the popup list.
XmNlabelString
The string displayed as the label of the DropDown widget.
XmNpopupCursor
The cursor to display to the user when the DropDown's list is popped up. See X
Window System, Robert Scheiffler et al., Appendix B, for choices.
XmNpopupOffset
The amount of space in pixels between the left edge of the Text widget and the
left edge of the list when the list is displayed. Positive values mean the
text's left edge is farther to the left, negative values mean the list's edge is
farther to the left. If this is a non-custom DropDown widget the right edge of
the text and the right edge of the arrow button will always line up.
XmNpopupShellWidget
The widget identifier for the shell that is popped up when the arrow is clicked.
If customizedCombinationBox is False then this widget is automatically created
by the DropDown widget.
XmNshowLabel
A boolean value that specifies whether or not to display the DropDown Label
widget.
XmNupdateShellCallback
XmNupdateTextCallback
The callback routine to call when either the shell widget contents or the Text
widget need to be updated to correspond with the other. The shell is updated
just before it is popped up. The text is updated just after the shell is popped
down. If customizedComboBox is False then the updates are done automatically by
the combo box. These routines are called to inform the application that an
action has been taken, in case it would like to do any further processing.
XmNuseTextField
A boolean value that specifies if an XmTextField or an XmText widget should be
used for the text entry portion of the DropDown widget.
XmNvalue The string displayed in the Text widget.
XmNverify If this resource is true the DropDown widget will verify its value against the
list whenever it loses focus or the user types <Carriage Return>. If the
verification fails, an XtWarning is generated with a name of
XmNtextVerifyFailed. To trap this message register an XtWarningMsgHandler.
XmNverifyTextCallback
This routine is called whenever the Text widget's contents may need to be
verified against the popup shell's contents. If the customizedComboBox resource
is False then the DropDown widget has already performed the verification when
this routine is called.
XmNvisibleItemCount
The number of items visible in the popup list at one time.
Children
The DropDown is composed of many sub-widgets. Most of the information displayed to the
user is set through these sub widgets. Most values passed to this widget through the
argument list at creation time or via set values are passed to each of this widget's
children. Get values requests must be made on a child by child basis. The children of the
DropDown are listed below. The OSF/Motifdocumentation should be consulted for an
exhaustive set of resources for each child. A partial list of the most common resources
are listed here for convenience.
XmDropDown comboBox
XmLabel label
XmTextField text
XmArrowButton arrow
OverrideShell popupShell
XmScrolledWindow listSW
XmScrollBar ListvScrollBar
XmScrollBar ListhScrollBar
XmList list
The popup shell and its children are only created when customizedCombinationBox is False.
Inherited Resources
XmDropDown inherits behavior and resources from the superclasses described in the
following tables. For a complete description of each resource, refer to the reference
page for that superclass.
┌────────────────────────────────────────────────────────────────────────────────────────────────────┐
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