## GtkDevicePad GtkDevicePad — Pad device interface |

## Functions

int | gdk_device_pad_get_n_groups ()
int | gdk_device_pad_get_group_n_modes ()
int | gdk_device_pad_get_n_features ()
int | gdk_device_pad_get_feature_group ()

## Types and Values

| GdkDevicePad
enum | GdkDevicePadFeature

## Object Hierarchy

        GInterface
        ╰── GdkDevicePad

## Prerequisites

GdkDevicePad requires GdkDevice.

## Includes

    #include <gdk/gdk.h>

## Description

GdkDevicePad is an interface implemented by devices of type `GDK_SOURCE_TABLET_PAD`, it allows querying the features provided by the pad device.

Tablet pads may contain one or more groups, each containing a subset of the buttons/rings/strips available. `gdk_device_pad_get_n_groups()` can be used to obtain the number of groups, `gdk_device_pad_get_n_features()` and `gdk_device_pad_get_feature_group()` can be combined to find out the number of buttons/rings/strips the device has, and how are they grouped.

Each of those groups have different modes, which may be used to map each individual pad feature to multiple actions. Only one mode is effective (current) for each given group, different groups may have different current modes. The number of available modes in a group can be found out through `gdk_device_pad_get_group_n_modes()`, and the current mode for a given group will be notified through events of type GDK_PAD_GROUP_MODE.

## Functions

### gdk_device_pad_get_n_groups ()

    int
    gdk_device_pad_get_n_groups (GdkDevicePad *pad);

Returns the number of groups this pad device has. Pads have at least one group. A pad group is a subcollection of buttons/strip/rings that is affected collectively by a same current mode.

#### Parameters

pad | a GdkDevicePad |

#### Returns

The number of button/ring/strip groups in the pad.

### gdk_device_pad_get_group_n_modes ()

    int
    gdk_device_pad_get_group_n_modes (GdkDevicePad *pad,
                                      int group_idx);

Returns the number of modes that `group` may have.

#### Parameters

pad | a GdkDevicePad |
group_idx | group to get the number of available modes from |

#### Returns

The number of modes available in `group` .

### gdk_device_pad_get_n_features ()

    int
    gdk_device_pad_get_n_features (GdkDevicePad *pad,
                                   GdkDevicePadFeature feature);

Returns the number of features a tablet pad has.

#### Parameters

pad | a GdkDevicePad |
feature | a pad feature |

#### Returns

The amount of elements of type `feature` that this pad has.

### gdk_device_pad_get_feature_group ()

    int
    gdk_device_pad_get_feature_group (GdkDevicePad *pad,
                                      GdkDevicePadFeature feature,
                                      int feature_idx);

Returns the group the given `feature` and `idx` belong to, or -1 if feature/index do not exist in `pad` .

#### Parameters

pad | a GdkDevicePad |
feature | the feature type to get the group from |
feature_idx | the index of the feature to get the group from |

#### Returns

The group number of the queried pad feature.

## Types and Values

### GdkDevicePad

    typedef struct _GdkDevicePad GdkDevicePad;

The GdkDevicePad struct contains only private fields and should not be accessed directly.

### enum GdkDevicePadFeature

A pad feature.

#### Members

GDK_DEVICE_PAD_FEATURE_BUTTON | a button |
GDK_DEVICE_PAD_FEATURE_RING | a ring-shaped interactive area |
GDK_DEVICE_PAD_FEATURE_STRIP | a straight interactive area |