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3.63 Visual Info Data Structure

Figure 3-63 illustrates the visual info data structure (X$VISUAL_INFO).

Figure 3-63 Visual Info Data Structure

Table 3-65 describes the members of the window attributes data structure.

Table 3-65 Window Attributes Data Structure Members
Member Name Contents
X$L_WDAT_X Specifies the x-coordinate of the upper left outside corner of the window relative to its parent window.
X$L_WDAT_Y Specifies the y-coordinate of the upper left outside corner of the window relative to its parent window.
X$L_WDAT_WIDTH Specifies the width of the window, excluding the window border, in pixels.
X$L_WDAT_HEIGHT Specifies the height of the window, excluding the window border, in pixels.
X$L_WDAT_BORDER_WIDTH Specifies the width of the window border in pixels.
X$L_WDAT_DEPTH Specifies the bits per pixel of the window.
X$L_WDAT_VISUAL The VISUAL structure associated with the window. The VISUAL structure specifies how displays should treat color resources.
X$L_WDAT_ROOT Identifies the screen with which the window is associated.
X$L_WDAT_CLASS Specifies whether the window accepts input and output, or input only.
X$L_WDAT_BIT_GRAVITY Specifies how pixels should be moved when the window is resized.
X$L_WDAT_WIN_GRAVITY Specifies how the window should be repositioned when its parent window is resized.
X$L_WDAT_BACKING_STORE Indicates whether the server should maintain a record of portions of a window that are obscured when the window is mapped. Xlib can set this member to one of the following constants:
x$c_when_mapped  
x$c_always  
x$c_not_useful  
X$L_WDAT_BACKING_PLANES Indicates (with bits set to 1) which bit planes of the window hold dynamic data that must be preserved in backing stores and during save unders.
X$L_WDAT_BACKING_PIXEL Defines what values to use in planes not specified by X$L_WDAT_BACKING_PLANES.
X$L_WDAT_SAVE_UNDER Setting this member to true informs the server that the client would like the contents of the screen saved when the window obscures them. Saving the contents of obscured portions of the screen is not guaranteed.
X$L_WDAT_COLORMAP Specifies the color map, if any, that best reflects the colors of the window. The color map must have the same visual type as the window. If it does not, an error occurs.
X$L_WDAT_MAP_INSTALLED If set to true, indicates that the color map is currently installed and the window is being displayed in its correct colors.
X$L_WDAT_MAP_STATE Indicates whether the window is mapped and viewable. Xlib can set this member to one of the following constants:
x$c_is_unmapped  
x$c_is_unviewable  
x$c_is_viewable  
X$L_WDAT_ALL_EVENT_MASKS Indicates the set of events in which all applications have an interest. X$L_WDAT_ALL_EVENTS_MASK is the inclusive-OR of all event masks set for the window.
X$L_WDAT_YOUR_EVENT_MASK Indicates the events about which the querying client is interested in receiving notice.
X$L_WDAT_DO_NOT_PROPAGATE_MASK Defines which events should not be propagated to its ancestors when no application has the event type selected in the window.
X$L_WDAT_OVERRIDE_REDIRECT Specifies whether requests to map and configure the window should override a request by another client to redirect those calls.
X$L_WDAT_SCREEN Specifies the screen on which the window is mapped.

3.65 Window Changes Data Structure

Figure 3-65 illustrates the window changes data structure (X$WINDOW_CHANGES).

Figure 3-65 Window Changes Data Structure

Table 3-67 describes the members of the WM hints data structure.

Table 3-67 WM Hints Data Structure Members
Member Name Contents
X$L_HINT_FLAGS Specifies the members of the data structure that are defined.
X$L_HINT_INPUT Indicates whether or not the client relies on the window manager for keyboard input.
X$L_HINT_INITIAL_STATE Defines how the window should appear in its initial configuration. Possible initial states are as follows:
x$c_withdrawn_state  
x$c_normal_state  
x$c_iconic_state  
X$L_HINT_ICON_PIXMAP Identifies the pixmap used to create the window icon.
X$L_HINT_ICON_WINDOW Specifies the window to be used as an icon.
X$L_HINT_ICON_X Specifies the initial x-coordinate of the icon position.
X$L_HINT_ICON_Y Specifies the initial y-coordinate of the icon position.
X$L_HINT_ICON_MASK Specifies the pixels of the icon pixmap used to create the icon.
X$L_HINT_WINDOW_GROUP Specifies that a window belongs to a group of other windows.

3.67 Error Handling

Xlib routines can return the error codes described in Table 3-68. For more information about error handling, see the X Window System document.

Table 3-68 Xlib Error Codes
Error Code Description
X$C_BAD_ACCESS Possible causes are as follows:
  • An attempt to grab a key/button combination that has already been grabbed by another client
  • An attempt to free a color map entry that was not allocated by the client
  • An attempt to store in a read-only or unallocated color map entry
  • An attempt to modify the access control list from other than the local host
  • An attempt to select an event type, which only one client can select at a time, that has already been selected
X$C_BAD_ALLOC The server did not allocate the requested resource for any cause.
X$C_BAD_ATOM The value specified in an atom argument does not name a defined atom.
X$C_BAD_COLOR A value specified for a color map argument does not name a defined color map.
X$C_BAD_CURSOR A value specified for a cursor argument does not name a defined cursor.
X$C_BAD_DRAWABLE A value specified for a drawable argument does not name a defined window or pixmap.
X$C_BAD_FONT A value specified for a font argument does not name a defined font (or, in some cases, graphics context).
X$C_BAD_GC A value specified for a graphics context argument does not name a defined graphics context.
X$C_BAD_ID_CHOICE The value you choose for a resource identifier that either is not included in the range assigned to the client, or is already in use. Normally cannot occur and should be considered a server or Xlib error.
X$C_BAD_IMPLEMENTATION The server does not implement the entire request. Most likely caused by a server extension; a server that generates this error for a core protocol request is deficient.
X$C_BAD_LENGTH Request is shorter or longer than required to minimally contain the arguments. Usually indicates an internal Xlib or server error. The length of a request exceeds the maximum length accepted by the server.
X$C_BAD_MATCH Possible causes are as follows:
  • In a graphics request, the root and depth of the graphics context do not match those of the drawable.
  • An input-only window is used as a drawable.
  • One argument or pair of arguments has the correct type and range but fails to match in some other way required by the request.
  • An input-only window lacks this attribute.
X$C_BAD_NAME The font or color that you specified does not exist.
X$C_BAD_PIXMAP A value that you specified for a pixmap argument does not name a defined pixmap.
X$C_BAD_REQUEST The major or minor op-code that you specified does not indicate a valid request. This is usually an Xlib or server error.
X$C_BAD_VALUE Some numeric values fall outside the range of values accepted by the request. Unless a range is specified for an argument, the full range defined by the argument's type is accepted. Any argument defined as a set of alternatives can generate this error.
X$C_BAD_WINDOW Value specified for a window argument does not name a defined window.

Part II
OpenVMS DECwindows Intrinsics

 Part II documents intrinsics routines and data structures and includes the following chapters:

Chapter 4
Intrinsics Routines

This chapter documents the intrinsics routines. See Section 1.2 for information about the format used to describe each routine.

XtAddActions

FORMAT

XtAddActions

(action, num_actions)

Argument Information
Argument Type Access Mechanism
action XtActionList read value
num_actions Cardinal read value

This routine, superseded by XtAppAddActions, is supported for backward compatibility.

XtAddCallback

FORMAT

XtAddCallback

(w, callback_name, callback, client_data)

Argument Information
Argument Type Access Mechanism
w Widget read value
callback_name XtString read reference
callback XtCallbackProc read value
client_data XtPointer read value

XtAddCallbacks

FORMAT

XtAddCallbacks

(w, callback_name, callbacks)

Argument Information
Argument Type Access Mechanism
w Widget read value
callback_name XtString read reference
callbacks XtCallbackRec (array) read reference

XtAddConverter

FORMAT

XtAddConverter

(from_type, to_type, converter, convert_args, num_args)

Argument Information
Argument Type Access Mechanism
from_type XtString read reference
to_type XtString read reference
converter XtConverter read value
convert_args XtConvertArgRec (array) read reference
num_args Cardinal read value

This routine, superseded by XtSetTypeConverter and XtAppSetTypeConverter, is supported for backward compatibility.

XtAddEventHandler

FORMAT

XtAddEventHandler

(w, event_mask, nonmaskable, proc, client_data)

Argument Information
Argument Type Access Mechanism
w Widget read value
event_mask EventMask read value
nonmaskable Boolean read value
proc XtEventHandler read value
client_data XtPointer read value

XtAddExposureToRegion

FORMAT

XtAddExposureToRegion

(event, region)

Argument Information
Argument Type Access Mechanism
event Event read reference
region Region read value

XtAddGrab

FORMAT

XtAddGrab

(w, exclusive, spring_loaded)

Argument Information
Argument Type Access Mechanism
w Widget read value
exclusive Boolean read value
spring_loaded Boolean read value

XtAddInput

FORMAT

result XtAddInput

(source, condition, proc, client_data)

Argument Information
Argument Type Access Mechanism
result XtInputId write value
source LONGWORD read value
condition XtPointer read value
proc XtInputCallbackProc read value
client_data XtPointer read value

This routine, superseded by XtAppAddInput, is supported for backward compatibility.

XtAddRawEventHandler

FORMAT

XtAddRawEventHandler

(w, event_mask, nonmaskable, proc, client_data)

Argument Information
Argument Type Access Mechanism
w Widget read value
event_mask EventMask read value
nonmaskable Boolean read value
proc XtEventHandler read value
client_data XtPointer read value

XtAddTimeOut

FORMAT

result XtAddTimeOut

(interval, proc, client_data)

Argument Information
Argument Type Access Mechanism
result XtIntervalId write value
interval LONGWORD UNSIGNED read value
proc XtTimerCallbackProc read value
client_data XtPointer read value

This routine, superseded by XtAppAddTimeOut, is supported for backward compatibility.

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