## GtkHandleBox

GtkHandleBox — a widget for detachable window portions

## Functions

GtkWidget * | gtk_handle_box_new ()
void | gtk_handle_box_set_shadow_type ()
void | gtk_handle_box_set_handle_position ()
void | gtk_handle_box_set_snap_edge ()
GtkPositionType | gtk_handle_box_get_handle_position ()
GtkShadowType | gtk_handle_box_get_shadow_type ()
GtkPositionType | gtk_handle_box_get_snap_edge ()
gboolean | gtk_handle_box_get_child_detached ()

## Properties

gboolean | child-detached | Read
GtkPositionType | handle-position | Read / Write
GtkShadowType | shadow | Read / Write
GtkShadowType | shadow-type | Read / Write
GtkPositionType | snap-edge | Read / Write
gboolean | snap-edge-set | Read / Write

## Signals

void | child-attached | Run First
void | child-detached | Run First

## Types and Values

struct | GtkHandleBox

## Object Hierarchy

        GObject
        ╰── GInitiallyUnowned
            ╰── GtkObject
                ╰── GtkWidget
                    ╰── GtkContainer
                        ╰── GtkBin
                            ╰── GtkHandleBox

## Implemented Interfaces

GtkHandleBox implements AtkImplementorIface and GtkBuildable.

## Includes

    #include <gtk/gtk.h>

## Description

The GtkHandleBox widget allows a portion of a window to be "torn off". It is a bin widget which displays its child and a handle that the user can drag to tear off a separate window (the float window) containing the child widget. A thin ghost is drawn in the original location of the handlebox. By dragging the separate window back to its original location, it can be reattached.

When reattaching, the ghost and float window, must be aligned along one of the edges, the snap edge. This either can be specified by the application programmer explicitely, or GTK+ will pick a reasonable default based on the handle position.

To make detaching and reattaching the handlebox as minimally confusing as possible to the user, it is important to set the snap edge so that the snap edge does not move when the handlebox is deattached. For instance, if the handlebox is packed at the bottom of a VBox, then when the handlebox is detached, the bottom edge of the handlebox's allocation will remain fixed as the height of the handlebox shrinks, so the snap edge should be set to `GTK_POS_BOTTOM`.

## Functions

### gtk_handle_box_new ()

    GtkWidget *
    gtk_handle_box_new (void);

Create a new handle box.

#### Returns

a new GtkHandleBox.

### gtk_handle_box_set_shadow_type ()

    void
    gtk_handle_box_set_shadow_type (GtkHandleBox *handle_box,
                                    GtkShadowType type);

Sets the type of shadow to be drawn around the border of the handle box.

#### Parameters

handle_box | a GtkHandleBox |
type | the shadow type. |

### gtk_handle_box_set_handle_position ()

    void
    gtk_handle_box_set_handle_position (GtkHandleBox *handle_box,
                                        GtkPositionType position);

Sets the side of the handlebox where the handle is drawn.

#### Parameters

handle_box | a GtkHandleBox |
position | the side of the handlebox where the handle should be drawn. |

### gtk_handle_box_set_snap_edge ()

    void
    gtk_handle_box_set_snap_edge (GtkHandleBox *handle_box,
                                  GtkPositionType edge);

Sets the snap edge of a handlebox. The snap edge is the edge of the detached child that must be aligned with the corresponding edge of the "ghost" left behind when the child was detached to reattach the torn-off window. Usually, the snap edge should be chosen so that it stays in the same place on the screen when the handlebox is torn off.

If the snap edge is not set, then an appropriate value will be guessed from the handle position. If the handle position is `GTK_POS_RIGHT` or `GTK_POS_LEFT`, then the snap edge will be `GTK_POS_TOP`, otherwise it will be `GTK_POS_LEFT`.

#### Parameters

handle_box | a GtkHandleBox |
edge | the snap edge, or -1 to unset the value; in which case GTK+ will try to guess an appropriate value in the future. |

### gtk_handle_box_get_handle_position ()

    GtkPositionType
    gtk_handle_box_get_handle_position (GtkHandleBox *handle_box);

Gets the handle position of the handle box. See `gtk_handle_box_set_handle_position()`.

#### Parameters

handle_box | a GtkHandleBox |

#### Returns

the current handle position.

### gtk_handle_box_get_shadow_type ()

    GtkShadowType
    gtk_handle_box_get_shadow_type (GtkHandleBox *handle_box);

Gets the type of shadow drawn around the handle box. See `gtk_handle_box_set_shadow_type()`.

#### Parameters

handle_box | a GtkHandleBox |

#### Returns

the type of shadow currently drawn around the handle box.

### gtk_handle_box_get_snap_edge ()

    GtkPositionType
    gtk_handle_box_get_snap_edge (GtkHandleBox *handle_box);

Gets the edge used for determining reattachment of the handle box. See `gtk_handle_box_set_snap_edge()`.

#### Parameters

handle_box | a GtkHandleBox |

#### Returns

the edge used for determining reattachment, or (GtkPositionType)-1 if this is determined (as per default) from the handle position.

### gtk_handle_box_get_child_detached ()

    gboolean
    gtk_handle_box_get_child_detached (GtkHandleBox *handle_box);

Whether the handlebox's child is currently detached.

#### Parameters

handle_box | a GtkHandleBox |

#### Returns

`TRUE` if the child is currently detached, otherwise `FALSE`

Since 2.14

## Types and Values

### struct GtkHandleBox

    struct GtkHandleBox;

The GtkHandleBox struct contains the following fields. (These fields should be considered read-only. They should never be set by an application.)

GtkShadowType shadow_type; | The shadow type for the entry. (See `gtk_handle_box_set_shadow_type()`).
GtkPositionType handle_position; | The position of the handlebox's handle with respect to the child. (See `gtk_handle_box_set_handle_position()`)
gint snap_edge; | A value of type GtkPosition type indicating snap edge for the widget. (See gtk_handle_box_set_snap_edge). The value of -1 indicates that this value has not been set.
gboolean child_detached; | A boolean value indicating whether the handlebox's child is attached or detached.

## Property Details

### The `“child-detached”` property

      “child-detached”           gboolean

A boolean value indicating whether the handlebox's child is attached or detached.

Flags: Read

Default value: FALSE

### The `“handle-position”` property

      “handle-position”          GtkPositionType

Position of the handle relative to the child widget.

Flags: Read / Write

Default value: GTK_POS_LEFT

### The `“shadow”` property

      “shadow”                   GtkShadowType

Deprecated property, use shadow_type instead.

Flags: Read / Write

Default value: GTK_SHADOW_OUT

### The `“shadow-type”` property

      “shadow-type”              GtkShadowType

Appearance of the shadow that surrounds the container.

Flags: Read / Write

Default value: GTK_SHADOW_OUT

### The `“snap-edge”` property

      “snap-edge”                GtkPositionType

Side of the handlebox that's lined up with the docking point to dock the handlebox.

Flags: Read / Write

Default value: GTK_POS_TOP

### The `“snap-edge-set”` property

      “snap-edge-set”            gboolean

Whether to use the value from the snap_edge property or a value derived from handle_position.

Flags: Read / Write

Default value: FALSE

## Signal Details

### The `“child-attached”` signal

    void
    user_function (GtkHandleBox *handlebox,
                   GtkWidget    *widget,
                   gpointer      user_data)

This signal is emitted when the contents of the handlebox are reattached to the main window.

#### Parameters

handlebox | the object which received the signal. |
widget | the child widget of the handlebox. (this argument provides no extra information and is here only for backwards-compatibility) |
user_data | user data set when the signal handler was connected. |

Flags: Run First

### The `“child-detached”` signal

    void
    user_function (GtkHandleBox *handlebox,
                   GtkWidget    *widget,
                   gpointer      user_data)

This signal is emitted when the contents of the handlebox are detached from the main window.

#### Parameters

handlebox | the object which received the signal. |
widget | the child widget of the handlebox. (this argument provides no extra information and is here only for backwards-compatibility) |
user_data | user data set when the signal handler was connected. |

Flags: Run First