## Standard Enumerations Standard Enumerations |

## Synopsis

    #include <gtk/gtk.h>

    enum                GtkAccelFlags;
    enum                GtkArrowPlacement;
    enum                GtkArrowType;
    enum                GtkAttachOptions;
    enum                GtkButtonBoxStyle;
    enum                GtkCornerType;
    enum                GtkDeleteType;
    enum                GtkDirectionType;
    enum                GtkExpanderStyle;
    enum                GtkIMPreeditStyle;
    enum                GtkIMStatusStyle;
    enum                GtkJustification;
    enum                GtkMovementStep;
    enum                GtkOrientation;
    enum                GtkPackType;
    enum                GtkPathPriorityType;
    enum                GtkPathType;
    enum                GtkPolicyType;
    enum                GtkPositionType;
    enum                GtkReliefStyle;
    enum                GtkResizeMode;
    enum                GtkScrollStep;
    enum                GtkScrollType;
    enum                GtkSelectionMode;
    enum                GtkShadowType;
    enum                GtkStateType;
    enum                GtkStateFlags;
    enum                GtkToolbarStyle;
    enum                GtkWindowPosition;
    enum                GtkWindowType;
    enum                GtkSortType;
    enum                GtkDragResult;
    enum                GtkJunctionSides;
    enum                GtkBorderStyle;
    enum                GtkRegionFlags;

## Description

## Details

### enum GtkAccelFlags

    typedef enum {
      GTK_ACCEL_VISIBLE        = 1 << 0, /* display in GtkAccelLabel? */
      GTK_ACCEL_LOCKED         = 1 << 1, /* is it removable? */
      GTK_ACCEL_MASK           = 0x07
    } GtkAccelFlags;

### enum GtkArrowPlacement

    typedef enum {
      GTK_ARROWS_BOTH,
      GTK_ARROWS_START,
      GTK_ARROWS_END
    } GtkArrowPlacement;

Used to specify the placement of scroll arrows in scrolling menus.

`GTK_ARROWS_BOTH` | Place one arrow on each end of the menu.
`GTK_ARROWS_START` | Place both arrows at the top of the menu.
`GTK_ARROWS_END` | Place both arrows at the bottom of the menu.

### enum GtkArrowType

    typedef enum {
      GTK_ARROW_UP,
      GTK_ARROW_DOWN,
      GTK_ARROW_LEFT,
      GTK_ARROW_RIGHT,
      GTK_ARROW_NONE
    } GtkArrowType;

Used to indicate the direction in which a GtkArrow should point.

`GTK_ARROW_UP` | Represents an upward pointing arrow.
`GTK_ARROW_DOWN` | Represents a downward pointing arrow.
`GTK_ARROW_LEFT` | Represents a left pointing arrow.
`GTK_ARROW_RIGHT` | Represents a right pointing arrow.
`GTK_ARROW_NONE` | No arrow. Since 2.10.

### enum GtkAttachOptions

    typedef enum {
      GTK_EXPAND = 1 << 0,
      GTK_SHRINK = 1 << 1,
      GTK_FILL   = 1 << 2
    } GtkAttachOptions;

Denotes the expansion properties that a widget will have when it (or its parent) is resized.

`GTK_EXPAND` | the widget should expand to take up any extra space in its container that has been allocated.
`GTK_SHRINK` | the widget should shrink as and when possible.
`GTK_FILL` | the widget should fill the space allocated to it.

### enum GtkButtonBoxStyle

    typedef enum {
      GTK_BUTTONBOX_SPREAD = 1,
      GTK_BUTTONBOX_EDGE,
      GTK_BUTTONBOX_START,
      GTK_BUTTONBOX_END,
      GTK_BUTTONBOX_CENTER
    } GtkButtonBoxStyle;

Used to dictate the style that a GtkButtonBox uses to layout the buttons it contains. (See also: GtkVButtonBox and GtkHButtonBox).

`GTK_BUTTONBOX_SPREAD` | Buttons are evenly spread across the box.
`GTK_BUTTONBOX_EDGE` | Buttons are placed at the edges of the box.
`GTK_BUTTONBOX_START` | Buttons are grouped towards the start of the box, (on the left for a HBox, or the top for a VBox).
`GTK_BUTTONBOX_END` | Buttons are grouped towards the end of the box, (on the right for a HBox, or the bottom for a VBox).
`GTK_BUTTONBOX_CENTER` | Buttons are centered in the box. Since 2.12.

### enum GtkCornerType

    typedef enum {
      GTK_CORNER_TOP_LEFT,
      GTK_CORNER_BOTTOM_LEFT,
      GTK_CORNER_TOP_RIGHT,
      GTK_CORNER_BOTTOM_RIGHT
    } GtkCornerType;

Specifies which corner a child widget should be placed in when packed into a GtkScrolledWindow. This is effectively the opposite of where the scroll bars are placed.

`GTK_CORNER_TOP_LEFT` | Place the scrollbars on the right and bottom of the widget (default behaviour).
`GTK_CORNER_BOTTOM_LEFT` | Place the scrollbars on the top and right of the widget.
`GTK_CORNER_TOP_RIGHT` | Place the scrollbars on the left and bottom of the widget.
`GTK_CORNER_BOTTOM_RIGHT` | Place the scrollbars on the top and left of the widget.

### enum GtkDeleteType

    typedef enum {
      GTK_DELETE_CHARS,
      GTK_DELETE_WORD_ENDS,           /* delete only the portion of the word to the
                                       * left/right of cursor if we're in the middle
                                       * of a word */
      GTK_DELETE_WORDS,
      GTK_DELETE_DISPLAY_LINES,
      GTK_DELETE_DISPLAY_LINE_ENDS,
      GTK_DELETE_PARAGRAPH_ENDS,      /* like C-k in Emacs (or its reverse) */
      GTK_DELETE_PARAGRAPHS,          /* C-k in pico, kill whole line */
      GTK_DELETE_WHITESPACE           /* M-\ in Emacs */
    } GtkDeleteType;

### enum GtkDirectionType

    typedef enum {
      GTK_DIR_TAB_FORWARD,
      GTK_DIR_TAB_BACKWARD,
      GTK_DIR_UP,
      GTK_DIR_DOWN,
      GTK_DIR_LEFT,
      GTK_DIR_RIGHT
    } GtkDirectionType;

### enum GtkExpanderStyle

    typedef enum {
      GTK_EXPANDER_COLLAPSED,
      GTK_EXPANDER_SEMI_COLLAPSED,
      GTK_EXPANDER_SEMI_EXPANDED,
      GTK_EXPANDER_EXPANDED
    } GtkExpanderStyle;

Used to specify the style of the expanders drawn by a GtkTreeView.

`GTK_EXPANDER_COLLAPSED` | The style used for a collapsed subtree.
`GTK_EXPANDER_SEMI_COLLAPSED` | Intermediate style used during animation.
`GTK_EXPANDER_SEMI_EXPANDED` | Intermediate style used during animation.
`GTK_EXPANDER_EXPANDED` | The style used for an expanded subtree.

### enum GtkIMPreeditStyle

    typedef enum {
      GTK_IM_PREEDIT_NOTHING,
      GTK_IM_PREEDIT_CALLBACK,
      GTK_IM_PREEDIT_NONE
    } GtkIMPreeditStyle;

### enum GtkIMStatusStyle

    typedef enum {
      GTK_IM_STATUS_NOTHING,
      GTK_IM_STATUS_CALLBACK,
      GTK_IM_STATUS_NONE
    } GtkIMStatusStyle;

### enum GtkJustification

    typedef enum {
      GTK_JUSTIFY_LEFT,
      GTK_JUSTIFY_RIGHT,
      GTK_JUSTIFY_CENTER,
      GTK_JUSTIFY_FILL
    } GtkJustification;

Used for justifying the text inside a GtkLabel widget. (See also GtkAlignment).

`GTK_JUSTIFY_LEFT` | The text is placed at the left edge of the label.
`GTK_JUSTIFY_RIGHT` | The text is placed at the right edge of the label.
`GTK_JUSTIFY_CENTER` | The text is placed in the center of the label.
`GTK_JUSTIFY_FILL` | The text is placed is distributed across the label.

### enum GtkMovementStep

    typedef enum {
      GTK_MOVEMENT_LOGICAL_POSITIONS,
      GTK_MOVEMENT_VISUAL_POSITIONS,
      GTK_MOVEMENT_WORDS,
      GTK_MOVEMENT_DISPLAY_LINES,
      GTK_MOVEMENT_DISPLAY_LINE_ENDS,
      GTK_MOVEMENT_PARAGRAPHS,
      GTK_MOVEMENT_PARAGRAPH_ENDS,
      GTK_MOVEMENT_PAGES,
      GTK_MOVEMENT_BUFFER_ENDS,
      GTK_MOVEMENT_HORIZONTAL_PAGES
    } GtkMovementStep;

`GTK_MOVEMENT_LOGICAL_POSITIONS` | Move forward or back by graphemes
`GTK_MOVEMENT_VISUAL_POSITIONS` | Move left or right by graphemes
`GTK_MOVEMENT_WORDS` | Move forward or back by words
`GTK_MOVEMENT_DISPLAY_LINES` | Move up or down lines (wrapped lines)
`GTK_MOVEMENT_DISPLAY_LINE_ENDS` | Move to either end of a line
`GTK_MOVEMENT_PARAGRAPHS` | Move up or down paragraphs (newline-ended lines)
`GTK_MOVEMENT_PARAGRAPH_ENDS` | Move to either end of a paragraph
`GTK_MOVEMENT_PAGES` | Move by pages
`GTK_MOVEMENT_BUFFER_ENDS` | Move to ends of the buffer
`GTK_MOVEMENT_HORIZONTAL_PAGES` | Move horizontally by pages

### enum GtkOrientation

    typedef enum {
      GTK_ORIENTATION_HORIZONTAL,
      GTK_ORIENTATION_VERTICAL
    } GtkOrientation;

Represents the orientation of widgets which can be switched between horizontal and vertical orientation on the fly, like GtkToolbar.

`GTK_ORIENTATION_HORIZONTAL` | The widget is in horizontal orientation.
`GTK_ORIENTATION_VERTICAL` | The widget is in vertical orientation.

### enum GtkPackType

    typedef enum {
      GTK_PACK_START,
      GTK_PACK_END
    } GtkPackType;

Represents the packing location GtkBox children. (See: GtkVBox, GtkHBox, and GtkButtonBox).

`GTK_PACK_START` | The child is packed into the start of the box
`GTK_PACK_END` | The child is packed into the end of the box

### enum GtkPathPriorityType

    typedef enum {
      GTK_PATH_PRIO_LOWEST      = 0,
      GTK_PATH_PRIO_GTK	    = 4,
      GTK_PATH_PRIO_APPLICATION = 8,
      GTK_PATH_PRIO_THEME       = 10,
      GTK_PATH_PRIO_RC          = 12,
      GTK_PATH_PRIO_HIGHEST     = 15
    } GtkPathPriorityType;

### enum GtkPathType

    typedef enum {
      GTK_PATH_WIDGET,
      GTK_PATH_WIDGET_CLASS,
      GTK_PATH_CLASS
    } GtkPathType;

### enum GtkPolicyType

    typedef enum {
      GTK_POLICY_ALWAYS,
      GTK_POLICY_AUTOMATIC,
      GTK_POLICY_NEVER
    } GtkPolicyType;

Determines when a scroll bar will be visible.

`GTK_POLICY_ALWAYS` | The scrollbar is always visible.
`GTK_POLICY_AUTOMATIC` | The scrollbar will appear and disappear as necessary. For example, when all of a GtkCList can not be seen.
`GTK_POLICY_NEVER` | The scrollbar will never appear.

### enum GtkPositionType

    typedef enum {
      GTK_POS_LEFT,
      GTK_POS_RIGHT,
      GTK_POS_TOP,
      GTK_POS_BOTTOM
    } GtkPositionType;

Describes which edge of a widget a certain feature is positioned at, e.g. the tabs of a GtkNotebook, the handle of a GtkHandleBox or the label of a GtkScale.

`GTK_POS_LEFT` | The feature is at the left edge.
`GTK_POS_RIGHT` | The feature is at the right edge.
`GTK_POS_TOP` | The feature is at the top edge.
`GTK_POS_BOTTOM` | The feature is at the bottom edge.

### enum GtkReliefStyle

    typedef enum {
      GTK_RELIEF_NORMAL,
      GTK_RELIEF_HALF,
      GTK_RELIEF_NONE
    } GtkReliefStyle;

Indicated the relief to be drawn around a GtkButton.

`GTK_RELIEF_NORMAL` | Draw a normal relief.
`GTK_RELIEF_HALF` | A half relief.
`GTK_RELIEF_NONE` | No relief.

### enum GtkResizeMode

    typedef enum {
      GTK_RESIZE_PARENT,
      GTK_RESIZE_QUEUE,
      GTK_RESIZE_IMMEDIATE
    } GtkResizeMode;

`GTK_RESIZE_PARENT` | Pass resize request to the parent
`GTK_RESIZE_QUEUE` | Queue resizes on this widget
`GTK_RESIZE_IMMEDIATE` | Resize immediately. Deprecated.

### enum GtkScrollStep

    typedef enum {
      GTK_SCROLL_STEPS,
      GTK_SCROLL_PAGES,
      GTK_SCROLL_ENDS,
      GTK_SCROLL_HORIZONTAL_STEPS,
      GTK_SCROLL_HORIZONTAL_PAGES,
      GTK_SCROLL_HORIZONTAL_ENDS
    } GtkScrollStep;

### enum GtkScrollType

    typedef enum {
      GTK_SCROLL_NONE,
      GTK_SCROLL_JUMP,
      GTK_SCROLL_STEP_BACKWARD,
      GTK_SCROLL_STEP_FORWARD,
      GTK_SCROLL_PAGE_BACKWARD,
      GTK_SCROLL_PAGE_FORWARD,
      GTK_SCROLL_STEP_UP,
      GTK_SCROLL_STEP_DOWN,
      GTK_SCROLL_PAGE_UP,
      GTK_SCROLL_PAGE_DOWN,
      GTK_SCROLL_STEP_LEFT,
      GTK_SCROLL_STEP_RIGHT,
      GTK_SCROLL_PAGE_LEFT,
      GTK_SCROLL_PAGE_RIGHT,
      GTK_SCROLL_START,
      GTK_SCROLL_END
    } GtkScrollType;

### enum GtkSelectionMode

    typedef enum {
      GTK_SELECTION_NONE,
      GTK_SELECTION_SINGLE,
      GTK_SELECTION_BROWSE,
      GTK_SELECTION_MULTIPLE
    } GtkSelectionMode;

Used to control what selections users are allowed to make.

`GTK_SELECTION_NONE` | No selection is possible.
`GTK_SELECTION_SINGLE` | Zero or one element may be selected.
`GTK_SELECTION_BROWSE` | Exactly one element is selected. In some circumstances, such as initially or during a search operation, it's possible for no element to be selected with `GTK_SELECTION_BROWSE`. What is really enforced is that the user can't deselect a currently selected element except by selecting another element.
`GTK_SELECTION_MULTIPLE` | Any number of elements may be selected. The Ctrl key may be used to enlarge the selection, and Shift key to select between the focus and the child pointed to. Some widgets may also allow Click-drag to select a range of elements.

### enum GtkShadowType

    typedef enum {
      GTK_SHADOW_NONE,
      GTK_SHADOW_IN,
      GTK_SHADOW_OUT,
      GTK_SHADOW_ETCHED_IN,
      GTK_SHADOW_ETCHED_OUT
    } GtkShadowType;

Used to change the appearance of an outline typically provided by a GtkFrame.

`GTK_SHADOW_NONE` | No outline.
`GTK_SHADOW_IN` | The outline is bevelled inwards.
`GTK_SHADOW_OUT` | The outline is bevelled outwards like a button.
`GTK_SHADOW_ETCHED_IN` | The outline has a sunken 3d appearance.
`GTK_SHADOW_ETCHED_OUT` | The outline has a raised 3d appearance.

### enum GtkStateType

    typedef enum {
      GTK_STATE_NORMAL,
      GTK_STATE_ACTIVE,
      GTK_STATE_PRELIGHT,
      GTK_STATE_SELECTED,
      GTK_STATE_INSENSITIVE,
      GTK_STATE_INCONSISTENT,
      GTK_STATE_FOCUSED
    } GtkStateType;

This type indicates the current state of a widget; the state determines how the widget is drawn. The GtkStateType enumeration is also used to identify different colors in a GtkStyle for drawing, so states can be used for subparts of a widget as well as entire widgets.

`GTK_STATE_NORMAL` | State during normal operation.
`GTK_STATE_ACTIVE` | State of a currently active widget, such as a depressed button.
`GTK_STATE_PRELIGHT` | State indicating that the mouse pointer is over the widget and the widget will respond to mouse clicks.
`GTK_STATE_SELECTED` | State of a selected item, such the selected row in a list.
`GTK_STATE_INSENSITIVE` | State indicating that the widget is unresponsive to user actions.
`GTK_STATE_INCONSISTENT` | The widget is inconsistent, such as checkbuttons or radiobuttons that aren't either set to `TRUE` nor `FALSE`, or buttons requiring the user attention.
`GTK_STATE_FOCUSED` | The widget has the keyboard focus.

### enum GtkStateFlags

    typedef enum {
      GTK_STATE_FLAG_NORMAL       = 0,
      GTK_STATE_FLAG_ACTIVE       = 1 << 0,
      GTK_STATE_FLAG_PRELIGHT     = 1 << 1,
      GTK_STATE_FLAG_SELECTED     = 1 << 2,
      GTK_STATE_FLAG_INSENSITIVE  = 1 << 3,
      GTK_STATE_FLAG_INCONSISTENT = 1 << 4,
      GTK_STATE_FLAG_FOCUSED      = 1 << 5,
      GTK_STATE_FLAG_WINDOW_UNFOCUSED = 1 << 6
    } GtkStateFlags;

Describes a widget state.

`GTK_STATE_FLAG_NORMAL` | State during normal operation.
`GTK_STATE_FLAG_ACTIVE` | Widget is active.
`GTK_STATE_FLAG_PRELIGHT` | Widget has a mouse pointer over it.
`GTK_STATE_FLAG_SELECTED` | Widget is selected.
`GTK_STATE_FLAG_INSENSITIVE` | Widget is insensitive.
`GTK_STATE_FLAG_INCONSISTENT` | Widget is inconsistent.
`GTK_STATE_FLAG_FOCUSED` | Widget has the keyboard focus.
`GTK_STATE_FLAG_WINDOW_UNFOCUSED` | Widget's toplevel window is unfocused.

### enum GtkToolbarStyle

    typedef enum {
      GTK_TOOLBAR_ICONS,
      GTK_TOOLBAR_TEXT,
      GTK_TOOLBAR_BOTH,
      GTK_TOOLBAR_BOTH_HORIZ
    } GtkToolbarStyle;

Used to customize the appearance of a GtkToolbar. Note that setting the toolbar style overrides the user's preferences for the default toolbar style. Note that if the button has only a label set and GTK_TOOLBAR_ICONS is used, the label will be visible, and vice versa.

`GTK_TOOLBAR_ICONS` | Buttons display only icons in the toolbar.
`GTK_TOOLBAR_TEXT` | Buttons display only text labels in the toolbar.
`GTK_TOOLBAR_BOTH` | Buttons display text and icons in the toolbar.
`GTK_TOOLBAR_BOTH_HORIZ` | Buttons display icons and text alongside each other, rather than vertically stacked

### enum GtkWindowPosition

    typedef enum {
      GTK_WIN_POS_NONE,
      GTK_WIN_POS_CENTER,
      GTK_WIN_POS_MOUSE,
      GTK_WIN_POS_CENTER_ALWAYS,
      GTK_WIN_POS_CENTER_ON_PARENT
    } GtkWindowPosition;

Window placement can be influenced using this enumeration. Note that using GTK_WIN_POS_CENTER_ALWAYS is almost always a bad idea. It won't necessarily work well with all window managers or on all windowing systems.

`GTK_WIN_POS_NONE` | No influence is made on placement.
`GTK_WIN_POS_CENTER` | Windows should be placed in the center of the screen.
`GTK_WIN_POS_MOUSE` | Windows should be placed at the current mouse position.
`GTK_WIN_POS_CENTER_ALWAYS` | Keep window centered as it changes size, etc.
`GTK_WIN_POS_CENTER_ON_PARENT` | Center the window on its transient parent (see `gtk_window_set_transient_for()`).

### enum GtkWindowType

    typedef enum {
      GTK_WINDOW_TOPLEVEL,
      GTK_WINDOW_POPUP
    } GtkWindowType;

A GtkWindow can be one of these types. Most things you'd consider a "window" should have type GTK_WINDOW_TOPLEVEL; windows with this type are managed by the window manager and have a frame by default (call `gtk_window_set_decorated()` to toggle the frame). Windows with type GTK_WINDOW_POPUP are ignored by the window manager; window manager keybindings won't work on them, the window manager won't decorate the window with a frame, many GTK+ features that rely on the window manager will not work (e.g. resize grips and maximization/minimization). GTK_WINDOW_POPUP is used to implement widgets such as GtkMenu or tooltips that you normally don't think of as windows per se. Nearly all windows should be GTK_WINDOW_TOPLEVEL. In particular, do not use GTK_WINDOW_POPUP just to turn off the window borders; use `gtk_window_set_decorated()` for that.

`GTK_WINDOW_TOPLEVEL` | A regular window, such as a dialog.
`GTK_WINDOW_POPUP` | A special window such as a tooltip.

### enum GtkSortType

    typedef enum {
      GTK_SORT_ASCENDING,
      GTK_SORT_DESCENDING
    } GtkSortType;

Determines the direction of a sort.

`GTK_SORT_ASCENDING` | Sorting is in ascending order.
`GTK_SORT_DESCENDING` | Sorting is in descending order.

### enum GtkDragResult

    typedef enum {
      GTK_DRAG_RESULT_SUCCESS,
      GTK_DRAG_RESULT_NO_TARGET,
      GTK_DRAG_RESULT_USER_CANCELLED,
      GTK_DRAG_RESULT_TIMEOUT_EXPIRED,
      GTK_DRAG_RESULT_GRAB_BROKEN,
      GTK_DRAG_RESULT_ERROR
    } GtkDragResult;

Gives an indication why a drag operation failed. The value can by obtained by connecting to the "drag-failed" signal.

`GTK_DRAG_RESULT_SUCCESS` | The drag operation was successful.
`GTK_DRAG_RESULT_NO_TARGET` | No suitable drag target.
`GTK_DRAG_RESULT_USER_CANCELLED` | The user cancelled the drag operation.
`GTK_DRAG_RESULT_TIMEOUT_EXPIRED` | The drag operation timed out.
`GTK_DRAG_RESULT_GRAB_BROKEN` | The pointer or keyboard grab used for the drag operation was broken.
`GTK_DRAG_RESULT_ERROR` | The drag operation failed due to some unspecified error.

### enum GtkJunctionSides

    typedef enum {
      GTK_JUNCTION_NONE   = 0,
      GTK_JUNCTION_CORNER_TOPLEFT = 1 << 0,
      GTK_JUNCTION_CORNER_TOPRIGHT = 1 << 1,
      GTK_JUNCTION_CORNER_BOTTOMLEFT = 1 << 2,
      GTK_JUNCTION_CORNER_BOTTOMRIGHT = 1 << 3,
      GTK_JUNCTION_TOP    = (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_TOPRIGHT),
      GTK_JUNCTION_BOTTOM = (GTK_JUNCTION_CORNER_BOTTOMLEFT | GTK_JUNCTION_CORNER_BOTTOMRIGHT),
      GTK_JUNCTION_LEFT   = (GTK_JUNCTION_CORNER_TOPLEFT | GTK_JUNCTION_CORNER_BOTTOMLEFT),
      GTK_JUNCTION_RIGHT  = (GTK_JUNCTION_CORNER_TOPRIGHT | GTK_JUNCTION_CORNER_BOTTOMRIGHT)
    } GtkJunctionSides;

Describes how a rendered element connects to adjacent elements.

`GTK_JUNCTION_NONE` | No junctions.
`GTK_JUNCTION_CORNER_TOPLEFT` | Element connects on the top-left corner.
`GTK_JUNCTION_CORNER_TOPRIGHT` | Element connects on the top-right corner.
`GTK_JUNCTION_CORNER_BOTTOMLEFT` | Element connects on the bottom-left corner.
`GTK_JUNCTION_CORNER_BOTTOMRIGHT` | Element connects on the bottom-right corner.
`GTK_JUNCTION_TOP` | Element connects on the top side.
`GTK_JUNCTION_BOTTOM` | Element connects on the bottom side.
`GTK_JUNCTION_LEFT` | Element connects on the left side.
`GTK_JUNCTION_RIGHT` | Element connects on the right side.

### enum GtkBorderStyle

    typedef enum {
      GTK_BORDER_STYLE_NONE,
      GTK_BORDER_STYLE_SOLID,
      GTK_BORDER_STYLE_INSET,
      GTK_BORDER_STYLE_OUTSET
    } GtkBorderStyle;

Describes how the border of a UI element should be rendered.

`GTK_BORDER_STYLE_NONE` | No visible border
`GTK_BORDER_STYLE_SOLID` | A solid border
`GTK_BORDER_STYLE_INSET` | An inset border
`GTK_BORDER_STYLE_OUTSET` | An outset border

### enum GtkRegionFlags

    typedef enum {
      GTK_REGION_EVEN    = 1 << 0,
      GTK_REGION_ODD     = 1 << 1,
      GTK_REGION_FIRST   = 1 << 2,
      GTK_REGION_LAST    = 1 << 3,
      GTK_REGION_ONLY    = 1 << 4,
      GTK_REGION_SORTED  = 1 << 5
    } GtkRegionFlags;

Describes a region within a widget.

`GTK_REGION_EVEN` | Region has an even number within a set.
`GTK_REGION_ODD` | Region has an odd number within a set.
`GTK_REGION_FIRST` | Region is the first one within a set.
`GTK_REGION_LAST` | Region is the last one within a set.
`GTK_REGION_ONLY` | Region is the only one within a set.
`GTK_REGION_SORTED` | Region is part of a sorted area.