Data Transfer Behavior

Primitive has no widget class conversion or destination procedure. Subclasses and the XmNconvertCallback procedures are responsible for any conversion of selections. Subclasses and the subclass XmNdestinationCallback procedures are responsible for any data transfers to the widget.

Classes

Primitive inherits behavior, resources, and traits from Core.

The class pointer is xmPrimitiveWidgetClass.

The class name is XmPrimitive.

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 set at creation time (C), set by using XtSetValues (S), retrieved by using XtGetValues (G), or is not applicable (N/A).

XmNbottomShadowColor

Specifies the color to use to draw the bottom and right sides of the border shadow. This color is used if the XmNtopShadowPixmap resource is unspecified.

XmNbottomShadowPixmap

Specifies the pixmap to use to draw the bottom and right sides of the border shadow.

XmNconvertCallback

Specifies a list of callbacks called when the widget is asked to convert a selection. The type of the structure whose address is passed to these callbacks is XmConvertCallbackStruct. The reason is XmCR_OK.

XmNforeground

Specifies the foreground drawing color used by Primitive widgets.

XmNhelpCallback

Specifies the list of callbacks that is called when the help key is pressed. The reason sent by the callback is XmCR_HELP.

XmNhighlightColor

Specifies the color of the highlighting rectangle. This color is used if the highlight pixmap resource is XmUNSPECIFIED_PIXMAP.

XmNhighlightOnEnter

Specifies if the highlighting rectangle is drawn when the cursor moves into the widget. If the shell's focus policy is XmEXPLICIT, this resource is ignored, and the widget is highlighted when it has the focus. If the shell's focus policy is XmPOINTER and if this resource is True, the highlighting rectangle is drawn when the cursor moves into the widget. If the shell's focus policy is XmPOINTER and if this resource is False, the highlighting rectangle is not drawn when the the cursor moves into the widget. The default is False.

XmNhighlightPixmap

Specifies the pixmap used to draw the highlighting rectangle.

XmNhighlightThickness

Specifies the thickness of the highlighting rectangle.

XmNlayoutDirection

Specifies the direction in which components of the primitive (including strings) are laid out. The values are of type XmDirection. If the widget's parent is a primitive or shell, the value is inherited from the widget's parent. Otherwise, it is inherited from the closest ancestor vendor or menu shell. Refer to the XmDirection(3) reference page for the possible direction values.

XmNnavigationType

Determines whether the widget is a tab group.

XmNpopupHandlerCallback

Allows the application to control which popup menu will be automatically posted. The reason can either be XmCR_POST or XmCR_REPOST:

This callback uses the XmPopupHandlerCallbackStruct structure to pass information.

XmNshadowThickness

Specifies the size of the drawn border shadow.

XmNtoolTipString

The XmString to display as the toolTip. If this resource is NULL, no tip will be displayed. ToolTips are described in VendorShell(3)

XmNtopShadowColor

Specifies the color to use to draw the top and left sides of the border shadow. This color is used if the XmNtopShadowPixmap resource is unspecified. If a default top shadow pixmap exists, it will need to be removed for the XmNtopShadowColor to take effect.

XmNtopShadowPixmap

Specifies the pixmap to use to draw the top and left sides of the border shadow. A Primitive top shadow pixmap is created in two situations. In either of these situations, a default 50-foreground top shadow pixmap is created.

For example, if a widget with the same top shadow and background color is created, a default shadow pixmap is generated. Such a pixmap needs to be removed for the XmNtopShadowColor resource to take effect.

XmNtraversalOn

Specifies if traversal is activated for this widget. In CascadeButton and CascadeButtonGadget, this resource is forced to True unless the parent is an OptionMenu.

XmNunitType

Provides the basic support for resolution independence. It defines the type of units a widget uses with sizing and positioning resources. If the widget's parent is a subclass of XmManager and if the XmNunitType resource is not explicitly set, it defaults to the unit type of the parent widget. If the widget's parent is not a subclass of XmManager, the resource has a default unit type of XmPIXELS.

The unit type can also be specified in resource files, with the following format:

<floating value><unit>

where:

For example,

xmfonts*XmMainWindow.height: 10.4cm
*PostIn.width: 3inches

XmNunitType can have the following values:

XmNuserData

Allows the application to attach any necessary specific data to the widget. It is an internally unused resource.

Dynamic Color Defaults

The foreground, background, top shadow, bottom shadow, and highlight color resources are dynamically defaulted. If no color data is specified, the colors are automatically generated. On a single-plane system, a black and white color scheme is generated. Otherwise, four colors are generated, which display the correct shading for the 3-D visuals. If the background is the only color specified for a widget, the top shadow and bottom shadow colors are generated to give the 3-D appearance. Foreground and highlight colors are generated to provide sufficient contrast with the background color.

Colors are generated only at creation. Resetting the background through XtSetValues does not regenerate the other colors. XmChangeColor can be used to recalculate all associated colors based on a new background color.

Inherited Resources

Primitive inherits behavior and resources from the superclass described in the following table. For a complete description of each resource, refer to the reference page for that superclass.

Callback Information

A pointer to the following structure is passed to each callback for XmNhelpCallback:

typedef struct
{


        int reason;


        XEvent * event;
} XmAnyCallbackStruct;

reason

Indicates why the callback was invoked. For this callback, reason is set to XmCR_HELP.

event

Points to the XEvent that triggered the callback.

A pointer to the following callback structure is passed to the XmNconvertCallback procedures:

typedef struct
{


        int reason;


        XEvent *event;


        Atom selection;


        Atom target;


        XtPointer source_data;


        XtPointer location_data;


        int flags;


        XtPointer parm;


        int parm_format;


        unsigned long parm_length;


        Atom parm_type;


        int status;


        XtPointer value;


        Atom type;


        int format;


        unsigned long length;
} XmConvertCallbackStruct;

reason

Indicates why the callback was invoked.

event

Points to the XEvent that triggered the callback. It can be NULL.

selection

Indicates the selection for which conversion is being requested. Possible values are CLIPBOARD, PRIMARY, SECONDARY, and _MOTIF_DROP.

target

Indicates the conversion target.

source_data

Contains information about the selection source. When the selection is _MOTIF_DROP, source_data is the DragContext. Otherwise, it is NULL.

location_data

Contains information about the location of data to be converted. If the value is NULL, the data to be transferred consists of the widget's current selection. Otherwise, the type and interpretation of the value are specific to the widget class.

flags

Indicates the status of the conversion. Following are the possible values:

parm

Contains parameter data for this target. If no parameter data exists, the value is NULL.

When selection is CLIPBOARD and target is _MOTIF_CLIPBOARD_TARGETS or _MOTIF_DEFERRED_CLIPBOARD_TARGETS, the value is the requested operation (XmCOPY, XmMOVE, or XmLINK).

parm_format

Specifies whether the data in parm should be viewed as a list of char, short, or long quantities. Possible values are 0 (when parm is NULL), 8 (when the data in parm should be viewed as a list of chars), 16 (when the data in parm should be viewed as a list of shorts), or 32 (when the data in parm should be viewed as a list of longs). Note that parm_format symbolizes a data type, not the number of bits in each list element. For example, on some machines, a parm_format of 32 means that the data in parm should be viewed as a list of 64-bit quantities, not 32-bit quantities.

parm_length

Specifies the number of elements of data in parm, where each element has the size specified by parm_format. When parm is NULL, the value is 0.

parm_type

Specifies the parameter type of parm.

status

An IN/OUT member that specifies the status of the conversion. The initial value is XmCONVERT_DEFAULT. The callback procedure can set this member to one of the following values:

value

An IN/OUT parameter that contains any data that the callback procedure produces as a result of the conversion. The initial value is NULL. If the callback procedure sets this member, it must ensure that the type, format, and length members correspond to the data in value. The callback procedure is responsible for allocating memory when it sets this member. The toolkit frees this memory when it is no longer needed.

type

An IN/OUT parameter that indicates the type of the data in the value member. The initial value is INTEGER.

format

An IN/OUT parameter that specifies whether the data in value should be viewed as a list of char, short, or long quantities. The initial value is 8. The callback procedure can set this member to 8 (for a list of char), 16 (for a list of short), or 32 (for a list of long).

length

An IN/OUT member that specifies the number of elements of data in value, where each element has the size symbolized by format. The initial value is 0.

A pointer to the following structure is passed to each callback for XmNpopupHandlerCallback:

typedef struct
{


        int reason;


        XEvent * event;


        Widget menuToPost;


        Boolean postIt;


        Widget target;
} XmPopupHandlerCallbackStruct;

reason

Indicates why the callback was invoked.

event

Points to the XEvent that triggered the handler.

menuToPost

Specifies the popup menu that the menu system believes should be posted. The application may modify this field.

postIt

Indicates whether the posting process should continue. The application may modify this field.

target

Specifies the most specific widget or gadget that the menu system found from the event that matches the event.

Translations

The XmPrimitive translations are listed below.

Note that for buttons in menus, altering translations in #override or #augment mode is undefined.

The following key names are listed in the X standard key event translation table syntax. This format is the one used by Motif to specify the widget actions corresponding to a given key. A brief overview of the format is provided under VirtualBindings(3). For a complete description of the format, please refer to the X Toolkit Instrinsics Documentation.

:<Key><osfActivate>:

PrimitiveParentActivate()

:<Key><osfCancel>:

PrimitiveParentCancel()

:<Key><osfBeginLine>:

PrimitiveTraverseHome()

:<Key><osfUp>:

PrimitiveTraverseUp()

:<Key><osfDown>:

PrimitiveTraverseDown()

:<Key><osfLeft>:

PrimitiveTraverseLeft()

:<Key><osfRight>:

PrimitiveTraverseRight()

∼s ∼m ∼a <Key>Return:

PrimitiveParentActivate()

s ∼m ∼a <Key>Tab:

PrimitivePrevTabGroup()

∼m ∼a <Key>Tab:

PrimitiveNextTabGroup()

<Key><osfHelp>:

PrimitiveHelp()

Action Routines

The XmPrimitive action routines are

PrimitiveHelp():

Calls the callbacks for XmNhelpCallback if any exist. If there are no help callbacks for this widget, this action calls the help callbacks for the nearest ancestor that has them.

PrimitiveNextTabGroup():

This action depends on the value of the Display resource XmNenableButtonTab. When XmNenableButtonTab is False (default), this action traverses to the first item in the next tab group. If the current tab group is the last entry in the tab group list, it wraps to the beginning of the tab group list.

When XmNenableButtonTab is True, this action moves to the next item within the current tab group, unless it is the last item in the tab group. When the item is the last in the group, the action traverses to the first item in the next tab group. The XmNenableButtonTab behavior applies only to PushButton, ArrowButton, and DrawnArrow.

PrimitiveParentActivate():

If the parent is a manager, passes the KActivate event received by the widget to the parent.

PrimitiveParentCancel():

If the parent is a manager, passes the KCancel event received by the widget to the parent.

PrimitivePrevTabGroup():

This action depends on the value of the Display resource XmNenableButtonTab. When XmNenableButtonTab is False (default), this action traverses to the first item in the previous tab group. If the beginning of the tab group list is reached, it wraps to the end of the tab group list.

When XmNenableButtonTab is True, this action moves to the previous item within the current tab group unless it is the first item in the tab group. When the item is the first in the group, the action traverses to the first item in the previous tab group. The XmNenableButtonTab behavior applies only PushButton, ArrowButton, and DrawnButton.

PrimitiveTraverseDown():

Traverses to the next item below the current widget in the current tab group, wrapping if necessary. The wrapping direction depends on the layout direction of the widget tab group.

PrimitiveTraverseHome():

Traverses to the first widget or gadget in the current tab group.

PrimitiveTraverseLeft():

Traverses to the next item to the left of the current widget in the current tab group, wrapping if necessary. The wrapping direction depends on the layout direction of the widget tab group.

PrimitiveTraverseNext():

Traverses to the next item in the current tab group, wrapping if necessary. The wrapping direction depends on the layout direction of the widget tab group.

PrimitiveTraversePrev():

Traverses to the previous item in the current tab group, wrapping if necessary. The wrapping direction depends on the layout direction of the widget tab group.

PrimitiveTraverseRight():

Traverses to the next item to the right of the current gadget in the current tab group, wrapping if necessary. The wrapping direction depends on the layout direction of the widget tab group.

PrimitiveTraverseUp():

Traverses to the next item above the current gadget in the current tab group, wrapping if necessary. The wrapping direction depends on the layout direction of the widget tab group.

Additional Behavior

This widget has the following additional behavior:

<FocusIn>:

If the shell's keyboard focus policy is XmEXPLICIT, highlights the widget and gives it the focus

<FocusOut>:

If the shell's keyboard focus policy is XmEXPLICIT, unhighlights the widget and removes the focus

Virtual Bindings

The bindings for virtual keys are vendor specific. For information about bindings for virtual buttons and keys, see VirtualBindings(3).