gtk/gdk/gdkseat.c

/* GDK - The GIMP Drawing Kit
 * Copyright (C) 2015 Red Hat
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
 *
 * Author: Carlos Garnacho <carlosg@gnome.org>
 */

#include "config.h"

#include <glib-object.h>
#include "gdkdisplay.h"
#include "gdkdevice.h"
#include "gdkseatprivate.h"
#include "gdkdeviceprivate.h"
#include "gdkintl.h"
#include "gdkinternals.h"

/**
 * SECTION:gdkseat
 * @Short_description: Object representing a user seat
 * @Title: GdkSeat
 * @See_also: #GdkDisplay, #GdkDevice
 *
 * The #GdkSeat object represents a collection of input devices
 * that belong to a user.
 */

/**
 * GdkSeat:
 *
 * The GdkSeat struct contains only private fields and
 * should not be accessed directly.
 */

typedef struct _GdkSeatPrivate GdkSeatPrivate;

struct _GdkSeatPrivate
{
  GdkDisplay *display;
};

enum {
  DEVICE_ADDED,
  DEVICE_REMOVED,
  TOOL_ADDED,
  TOOL_REMOVED,
  N_SIGNALS
};

enum {
  PROP_0,
  PROP_DISPLAY,
  N_PROPS
};

static guint signals[N_SIGNALS] = { 0 };
static GParamSpec *props[N_PROPS] = { NULL };

G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GdkSeat, gdk_seat, G_TYPE_OBJECT)

static void
gdk_seat_set_property (GObject      *object,
                       guint         prop_id,
                       const GValue *value,
                       GParamSpec   *pspec)
{
  GdkSeatPrivate *priv = gdk_seat_get_instance_private (GDK_SEAT (object));

  switch (prop_id)
    {
    case PROP_DISPLAY:
      priv->display = g_value_get_object (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
gdk_seat_get_property (GObject    *object,
                       guint       prop_id,
                       GValue     *value,
                       GParamSpec *pspec)
{
  GdkSeatPrivate *priv = gdk_seat_get_instance_private (GDK_SEAT (object));

  switch (prop_id)
    {
    case PROP_DISPLAY:
      g_value_set_object (value, priv->display);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
gdk_seat_class_init (GdkSeatClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  object_class->set_property = gdk_seat_set_property;
  object_class->get_property = gdk_seat_get_property;

  /**
   * GdkSeat::device-added:
   * @seat: the object on which the signal is emitted
   * @device: the newly added #GdkDevice.
   *
   * The ::device-added signal is emitted when a new input
   * device is related to this seat.
   */
  signals [DEVICE_ADDED] =
    g_signal_new (g_intern_static_string ("device-added"),
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (GdkSeatClass, device_added),
                  NULL, NULL,
                  NULL,
                  G_TYPE_NONE, 1,
                  GDK_TYPE_DEVICE);

  /**
   * GdkSeat::device-removed:
   * @seat: the object on which the signal is emitted
   * @device: the just removed #GdkDevice.
   *
   * The ::device-removed signal is emitted when an
   * input device is removed (e.g. unplugged).
   */
  signals [DEVICE_REMOVED] =
    g_signal_new (g_intern_static_string ("device-removed"),
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (GdkSeatClass, device_removed),
                  NULL, NULL,
                  NULL,
                  G_TYPE_NONE, 1,
                  GDK_TYPE_DEVICE);

  /**
   * GdkSeat::tool-added:
   * @seat: the object on which the signal is emitted
   * @tool: the new #GdkDeviceTool known to the seat
   *
   * The ::tool-added signal is emitted whenever a new tool
   * is made known to the seat. The tool may later be assigned
   * to a device (i.e. on proximity with a tablet). The device
   * will emit the #GdkDevice::tool-changed signal accordingly.
   *
   * A same tool may be used by several devices.
   */
  signals [TOOL_ADDED] =
    g_signal_new (g_intern_static_string ("tool-added"),
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0, NULL, NULL,
                  NULL,
                  G_TYPE_NONE, 1,
                  GDK_TYPE_DEVICE_TOOL);

  /**
   * GdkSeat::tool-removed:
   * @seat: the object on which the signal is emitted
   * @tool: the just removed #GdkDeviceTool
   *
   * This signal is emitted whenever a tool is no longer known
   * to this @seat.
   */
  signals [TOOL_REMOVED] =
    g_signal_new (g_intern_static_string ("tool-removed"),
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0, NULL, NULL,
                  NULL,
                  G_TYPE_NONE, 1,
                  GDK_TYPE_DEVICE_TOOL);

  /**
   * GdkSeat:display:
   *
   * #GdkDisplay of this seat.
   */
  props[PROP_DISPLAY] =
    g_param_spec_object ("display",
                         P_("Display"),
                         P_("Display"),
                         GDK_TYPE_DISPLAY,
                         G_PARAM_READWRITE |
                         G_PARAM_CONSTRUCT_ONLY |
                         G_PARAM_STATIC_STRINGS);

  g_object_class_install_properties (object_class, N_PROPS, props);
}

static void
gdk_seat_init (GdkSeat *seat)
{
}

/**
 * gdk_seat_get_capabilities:
 * @seat: a #GdkSeat
 *
 * Returns the capabilities this #GdkSeat currently has.
 *
 * Returns: the seat capabilities
 **/
GdkSeatCapabilities
gdk_seat_get_capabilities (GdkSeat *seat)
{
  GdkSeatClass *seat_class;

  g_return_val_if_fail (GDK_IS_SEAT (seat), GDK_SEAT_CAPABILITY_NONE);

  seat_class = GDK_SEAT_GET_CLASS (seat);
  return seat_class->get_capabilities (seat);
}

/**
 * gdk_seat_grab:
 * @seat: a #GdkSeat
 * @surface: the #GdkSurface which will own the grab
 * @capabilities: capabilities that will be grabbed
 * @owner_events: if %FALSE then all device events are reported with respect to
 *                @surface and are only reported if selected by @event_mask. If
 *                %TRUE then pointer events for this application are reported
 *                as normal, but pointer events outside this application are
 *                reported with respect to @surface and only if selected by
 *                @event_mask. In either mode, unreported events are discarded.
 * @cursor: (nullable): the cursor to display while the grab is active. If
 *          this is %NULL then the normal cursors are used for
 *          @surface and its descendants, and the cursor for @surface is used
 *          elsewhere.
 * @event: (nullable): the event that is triggering the grab, or %NULL if none
 *         is available.
 * @prepare_func: (nullable) (scope call): function to
 *                prepare the surface to be grabbed, it can be %NULL if @surface is
 *                visible before this call.
 * @prepare_func_data: (closure): user data to pass to @prepare_func
 *
 * Grabs the seat so that all events corresponding to the given @capabilities
 * are passed to this application until the seat is ungrabbed with gdk_seat_ungrab(),
 * or the surface becomes hidden. This overrides any previous grab on the
 * seat by this client.
 *
 * As a rule of thumb, if a grab is desired over %GDK_SEAT_CAPABILITY_POINTER,
 * all other "pointing" capabilities (eg. %GDK_SEAT_CAPABILITY_TOUCH) should
 * be grabbed too, so the user is able to interact with all of those while
 * the grab holds, you should thus use %GDK_SEAT_CAPABILITY_ALL_POINTING most
 * commonly.
 *
 * Grabs are used for operations which need complete control over the
 * events corresponding to the given capabilities. For example in GTK this
 * is used for Drag and Drop operations, popup menus and such.
 *
 * Note that if the event mask of a #GdkSurface has selected both button press
 * and button release events, or touch begin and touch end, then a press event
 * will cause an automatic grab until the button is released, equivalent to a
 * grab on the surface with @owner_events set to %TRUE. This is done because most
 * applications expect to receive paired press and release events.
 *
 * If you set up anything at the time you take the grab that needs to be
 * cleaned up when the grab ends, you should handle the #GdkEventGrabBroken
 * events that are emitted when the grab ends unvoluntarily.
 *
 * Returns: %GDK_GRAB_SUCCESS if the grab was successful.
 **/
GdkGrabStatus
gdk_seat_grab (GdkSeat                *seat,
               GdkSurface              *surface,
               GdkSeatCapabilities     capabilities,
               gboolean                owner_events,
               GdkCursor              *cursor,
               GdkEvent               *event,
               GdkSeatGrabPrepareFunc  prepare_func,
               gpointer                prepare_func_data)
{
  GdkSeatClass *seat_class;

  g_return_val_if_fail (GDK_IS_SEAT (seat), GDK_GRAB_FAILED);
  g_return_val_if_fail (GDK_IS_SURFACE (surface), GDK_GRAB_FAILED);
  g_return_val_if_fail (gdk_surface_get_display (surface) == gdk_seat_get_display (seat), GDK_GRAB_FAILED);

  capabilities &= GDK_SEAT_CAPABILITY_ALL;
  g_return_val_if_fail (capabilities != GDK_SEAT_CAPABILITY_NONE, GDK_GRAB_FAILED);

  seat_class = GDK_SEAT_GET_CLASS (seat);

  return seat_class->grab (seat, surface, capabilities, owner_events, cursor,
                           event, prepare_func, prepare_func_data);
}

/**
 * gdk_seat_ungrab:
 * @seat: a #GdkSeat
 *
 * Releases a grab added through gdk_seat_grab().
 **/
void
gdk_seat_ungrab (GdkSeat *seat)
{
  GdkSeatClass *seat_class;

  g_return_if_fail (GDK_IS_SEAT (seat));

  seat_class = GDK_SEAT_GET_CLASS (seat);
  seat_class->ungrab (seat);
}

/**
 * gdk_seat_get_slaves:
 * @seat: a #GdkSeat
 * @capabilities: capabilities to get devices for
 *
 * Returns the slave devices that match the given capabilities.
 *
 * Returns: (transfer container) (element-type GdkDevice): A list of #GdkDevices.
 *          The list must be freed with g_list_free(), the elements are owned
 *          by GDK and must not be freed.
 **/
GList *
gdk_seat_get_slaves (GdkSeat             *seat,
                     GdkSeatCapabilities  capabilities)
{
  GdkSeatClass *seat_class;

  g_return_val_if_fail (GDK_IS_SEAT (seat), NULL);

  seat_class = GDK_SEAT_GET_CLASS (seat);
  return seat_class->get_slaves (seat, capabilities);
}

/**
 * gdk_seat_get_pointer:
 * @seat: a #GdkSeat
 *
 * Returns the master device that routes pointer events.
 *
 * Returns: (transfer none) (nullable): a master #GdkDevice with pointer
 *          capabilities. This object is owned by GTK and must not be freed.
 **/
GdkDevice *
gdk_seat_get_pointer (GdkSeat *seat)
{
  GdkSeatClass *seat_class;

  g_return_val_if_fail (GDK_IS_SEAT (seat), NULL);

  seat_class = GDK_SEAT_GET_CLASS (seat);
  return seat_class->get_master (seat, GDK_SEAT_CAPABILITY_POINTER);
}

/**
 * gdk_seat_get_keyboard:
 * @seat: a #GdkSeat
 *
 * Returns the master device that routes keyboard events.
 *
 * Returns: (transfer none) (nullable): a master #GdkDevice with keyboard
 *          capabilities. This object is owned by GTK and must not be freed.
 **/
GdkDevice *
gdk_seat_get_keyboard (GdkSeat *seat)
{
  GdkSeatClass *seat_class;

  g_return_val_if_fail (GDK_IS_SEAT (seat), NULL);

  seat_class = GDK_SEAT_GET_CLASS (seat);
  return seat_class->get_master (seat, GDK_SEAT_CAPABILITY_KEYBOARD);
}

void
gdk_seat_device_added (GdkSeat   *seat,
                       GdkDevice *device)
{
  gdk_device_set_seat (device, seat);
  g_signal_emit (seat, signals[DEVICE_ADDED], 0, device);
}

void
gdk_seat_device_removed (GdkSeat   *seat,
                         GdkDevice *device)
{
  gdk_device_set_seat (device, NULL);
  g_signal_emit (seat, signals[DEVICE_REMOVED], 0, device);
}

/**
 * gdk_seat_get_display:
 * @seat: a #GdkSeat
 *
 * Returns the #GdkDisplay this seat belongs to.
 *
 * Returns: (transfer none): a #GdkDisplay. This object is owned by GTK
 *          and must not be freed.
 **/
GdkDisplay *
gdk_seat_get_display (GdkSeat *seat)
{
  GdkSeatPrivate *priv = gdk_seat_get_instance_private (seat);

  g_return_val_if_fail (GDK_IS_SEAT (seat), NULL);

  return priv->display;
}

void
gdk_seat_tool_added (GdkSeat       *seat,
                     GdkDeviceTool *tool)
{
  g_signal_emit (seat, signals[TOOL_ADDED], 0, tool);
}

void
gdk_seat_tool_removed (GdkSeat       *seat,
                       GdkDeviceTool *tool)
{
  g_signal_emit (seat, signals[TOOL_REMOVED], 0, tool);
}

GdkDeviceTool *
gdk_seat_get_tool (GdkSeat *seat,
                   guint64  serial,
                   guint64  hw_id)
{
  GdkSeatClass *seat_class;

  g_return_val_if_fail (GDK_IS_SEAT (seat), NULL);

  seat_class = GDK_SEAT_GET_CLASS (seat);
  return seat_class->get_tool (seat, serial, hw_id);
}

/**
 * gdk_seat_get_master_pointers:
 * @seat: The #GdkSeat
 * @capabilities: Queried capabilities
 *
 * Returns all master pointers with the given capabilities driven by this @seat.
 * On most backends this function will return a list with a single element (meaning
 * that all input devices drive the same onscreen cursor).
 *
 * In other backends where there can possibly be multiple foci (eg. wayland),
 * this function will return all master #GdkDevices that represent these.
 *
 * Returns: (transfer container) (element-type GdkDevice): A list
 * of master pointing devices
 */
GList *
gdk_seat_get_master_pointers (GdkSeat             *seat,
                              GdkSeatCapabilities  capabilities)
{
  g_return_val_if_fail (GDK_IS_SEAT (seat), NULL);

  return GDK_SEAT_GET_CLASS (seat)->get_master_pointers (seat, capabilities);
}