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gtk/gdk/gdkdevice.c

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 2009 Carlos Garnacho <carlosg@gnome.org>
*
* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "gdkdevice.h"
#include "gdkdeviceprivate.h"
#include "gdkintl.h"
#include "gdkinternals.h"
typedef struct _GdkAxisInfo GdkAxisInfo;
struct _GdkAxisInfo
{
GdkAtom label;
GdkAxisUse use;
gdouble min_axis;
gdouble max_axis;
gdouble min_value;
gdouble max_value;
gdouble resolution;
};
struct _GdkDevicePrivate
{
GdkDeviceManager *device_manager;
GdkDisplay *display;
GdkDevice *associated;
GdkDeviceType type;
GArray *axes;
};
static void gdk_device_dispose (GObject *object);
static void gdk_device_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gdk_device_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
G_DEFINE_ABSTRACT_TYPE (GdkDevice, gdk_device, G_TYPE_OBJECT)
enum {
PROP_0,
PROP_DISPLAY,
PROP_DEVICE_MANAGER,
PROP_NAME,
PROP_ASSOCIATED_DEVICE,
PROP_TYPE,
PROP_INPUT_SOURCE,
PROP_INPUT_MODE,
PROP_HAS_CURSOR,
PROP_N_AXES
};
static void
gdk_device_class_init (GdkDeviceClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = gdk_device_dispose;
object_class->set_property = gdk_device_set_property;
object_class->get_property = gdk_device_get_property;
/**
* GdkDevice:display:
*
* The #GdkDisplay the #GdkDevice pertains to.
*
* Since: 3.0
*/
g_object_class_install_property (object_class,
PROP_DISPLAY,
g_param_spec_object ("display",
P_("Device Display"),
P_("Display to which the device belongs to"),
GDK_TYPE_DISPLAY,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
/**
* GdkDevice:device-manager:
*
* The #GdkDeviceManager the #GdkDevice pertains to.
*
* Since: 3.0
*/
g_object_class_install_property (object_class,
PROP_DEVICE_MANAGER,
g_param_spec_object ("device-manager",
P_("Device manager"),
P_("Device manager to which the device belongs to"),
GDK_TYPE_DEVICE_MANAGER,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
/**
* GdkDevice:name:
*
* The device name.
*
* Since: 3.0
*/
g_object_class_install_property (object_class,
PROP_NAME,
g_param_spec_string ("name",
P_("Device name"),
P_("Device name"),
NULL,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
/**
* GdkDevice:type:
*
* Device role in the device manager.
*
* Since: 3.0
*/
g_object_class_install_property (object_class,
PROP_TYPE,
g_param_spec_enum ("type",
P_("Device type"),
P_("Device role in the device manager"),
GDK_TYPE_DEVICE_TYPE,
GDK_DEVICE_TYPE_MASTER,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
/**
* GdkDevice:associated-device:
*
* Associated pointer or keyboard to this device, if any. Devices of type #GDK_DEVICE_TYPE_MASTER
* always come in keyboard/pointer pairs. Other device types will have a %NULL associated device.
*
* Since: 3.0
*/
g_object_class_install_property (object_class,
PROP_ASSOCIATED_DEVICE,
g_param_spec_object ("associated-device",
P_("Associated device"),
P_("Associated pointer or keyboard to this device"),
GDK_TYPE_DEVICE,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
/**
* GdkDevice:input-source:
*
* Source type for the device.
*
* Since: 3.0
*/
g_object_class_install_property (object_class,
PROP_INPUT_SOURCE,
g_param_spec_enum ("input-source",
P_("Input source"),
P_("Source type for the device"),
GDK_TYPE_INPUT_SOURCE,
GDK_SOURCE_MOUSE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
/**
* GdkDevice:input-mode:
*
* Input mode for the device.
*
* Since: 3.0
*/
g_object_class_install_property (object_class,
PROP_INPUT_MODE,
g_param_spec_enum ("input-mode",
P_("Input mode for the device"),
P_("Input mode for the device"),
GDK_TYPE_INPUT_MODE,
GDK_MODE_DISABLED,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GdkDevice:has-cursor:
*
* Whether the device is represented by a cursor on the screen. Devices of type
* %GDK_DEVICE_TYPE_MASTER will have %TRUE here.
*
* Since: 3.0
*/
g_object_class_install_property (object_class,
PROP_HAS_CURSOR,
g_param_spec_boolean ("has-cursor",
P_("Whether the device has cursor"),
P_("Whether there is a visible cursor following device motion"),
FALSE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
/**
* GdkDevice:n-axes:
*
* Number of axes in the device.
*
* Since: 3.0
*/
g_object_class_install_property (object_class,
PROP_N_AXES,
g_param_spec_uint ("n-axes",
P_("Number of axes in the device"),
P_("Number of axes in the device"),
0, G_MAXUINT, 0,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_type_class_add_private (object_class, sizeof (GdkDevicePrivate));
}
static void
gdk_device_init (GdkDevice *device)
{
GdkDevicePrivate *priv;
device->priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (device,
GDK_TYPE_DEVICE,
GdkDevicePrivate);
priv->axes = g_array_new (FALSE, TRUE, sizeof (GdkAxisInfo));
}
static void
gdk_device_dispose (GObject *object)
{
GdkDevicePrivate *priv;
GdkDevice *device;
device = GDK_DEVICE (object);
priv = device->priv;
if (priv->associated)
{
_gdk_device_set_associated_device (priv->associated, NULL);
g_object_unref (priv->associated);
priv->associated = NULL;
}
if (priv->axes)
{
g_array_free (priv->axes, TRUE);
priv->axes = NULL;
}
g_free (device->name);
g_free (device->keys);
g_free (device->axes);
device->name = NULL;
device->keys = NULL;
device->axes = NULL;
G_OBJECT_CLASS (gdk_device_parent_class)->dispose (object);
}
static void
gdk_device_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GdkDevice *device = GDK_DEVICE (object);
GdkDevicePrivate *priv = device->priv;
switch (prop_id)
{
case PROP_DISPLAY:
priv->display = g_value_get_object (value);
break;
case PROP_DEVICE_MANAGER:
priv->device_manager = g_value_get_object (value);
break;
case PROP_NAME:
if (device->name)
g_free (device->name);
device->name = g_value_dup_string (value);
break;
case PROP_TYPE:
priv->type = g_value_get_enum (value);
break;
case PROP_INPUT_SOURCE:
device->source = g_value_get_enum (value);
break;
case PROP_INPUT_MODE:
gdk_device_set_mode (device, g_value_get_enum (value));
break;
case PROP_HAS_CURSOR:
device->has_cursor = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gdk_device_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GdkDevice *device = GDK_DEVICE (object);
GdkDevicePrivate *priv = device->priv;
switch (prop_id)
{
case PROP_DISPLAY:
g_value_set_object (value, priv->display);
break;
case PROP_DEVICE_MANAGER:
g_value_set_object (value, priv->device_manager);
break;
case PROP_ASSOCIATED_DEVICE:
g_value_set_object (value, priv->associated);
break;
case PROP_NAME:
g_value_set_string (value,
device->name);
break;
case PROP_TYPE:
g_value_set_enum (value, priv->type);
break;
case PROP_INPUT_SOURCE:
g_value_set_enum (value, device->source);
break;
case PROP_INPUT_MODE:
g_value_set_enum (value, device->mode);
break;
case PROP_HAS_CURSOR:
g_value_set_boolean (value,
device->has_cursor);
break;
case PROP_N_AXES:
g_value_set_uint (value, priv->axes->len);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gdk_device_get_state:
* @device: a #GdkDevice.
* @window: a #GdkWindow.
* @axes: an array of doubles to store the values of the axes of @device in,
* or %NULL.
* @mask: location to store the modifiers, or %NULL.
*
* Gets the current state of a device relative to @window.
*/
void
gdk_device_get_state (GdkDevice *device,
GdkWindow *window,
gdouble *axes,
GdkModifierType *mask)
{
g_return_if_fail (GDK_IS_DEVICE (device));
g_return_if_fail (GDK_IS_WINDOW (window));
if (GDK_DEVICE_GET_CLASS (device)->get_state)
GDK_DEVICE_GET_CLASS (device)->get_state (device, window, axes, mask);
}
/**
* gdk_device_get_history:
* @device: a #GdkDevice
* @window: the window with respect to which which the event coordinates will be reported
* @start: starting timestamp for range of events to return
* @stop: ending timestamp for the range of events to return
* @events: (array length=n_events) (out) (transfer none): location to store a newly-allocated array of #GdkTimeCoord, or %NULL
* @n_events: location to store the length of @events, or %NULL
*
* Obtains the motion history for a device; given a starting and
* ending timestamp, return all events in the motion history for
* the device in the given range of time. Some windowing systems
* do not support motion history, in which case, %FALSE will
* be returned. (This is not distinguishable from the case where
* motion history is supported and no events were found.)
*
* Return value: %TRUE if the windowing system supports motion history and
* at least one event was found.
**/
gboolean
gdk_device_get_history (GdkDevice *device,
GdkWindow *window,
guint32 start,
guint32 stop,
GdkTimeCoord ***events,
guint *n_events)
{
g_return_val_if_fail (GDK_IS_DEVICE (device), FALSE);
g_return_val_if_fail (GDK_IS_WINDOW (window), FALSE);
if (n_events)
*n_events = 0;
if (events)
*events = NULL;
if (GDK_WINDOW_DESTROYED (window))
return FALSE;
if (!GDK_DEVICE_GET_CLASS (device)->get_history)
return FALSE;
return GDK_DEVICE_GET_CLASS (device)->get_history (device, window,
start, stop,
events, n_events);
}
GdkTimeCoord **
_gdk_device_allocate_history (GdkDevice *device,
guint n_events)
{
GdkTimeCoord **result = g_new (GdkTimeCoord *, n_events);
gint i;
for (i = 0; i < n_events; i++)
result[i] = g_malloc (sizeof (GdkTimeCoord) -
sizeof (double) * (GDK_MAX_TIMECOORD_AXES - device->num_axes));
return result;
}
/**
* gdk_device_free_history:
* @events: (inout) (transfer none): an array of #GdkTimeCoord.
* @n_events: the length of the array.
*
* Frees an array of #GdkTimeCoord that was returned by gdk_device_get_history().
*/
void
gdk_device_free_history (GdkTimeCoord **events,
gint n_events)
{
gint i;
for (i = 0; i < n_events; i++)
g_free (events[i]);
g_free (events);
}
/**
* gdk_device_get_name:
* @device: a #GdkDevice
*
* Determines the name of the device.
*
* Return value: a name
*
* Since: 2.20
**/
const gchar *
gdk_device_get_name (GdkDevice *device)
{
g_return_val_if_fail (GDK_IS_DEVICE (device), NULL);
return device->name;
}
/**
* gdk_device_get_has_cursor:
* @device: a #GdkDevice
*
* Determines whether the pointer follows device motion.
*
* Return value: %TRUE if the pointer follows device motion
*
* Since: 2.20
**/
gboolean
gdk_device_get_has_cursor (GdkDevice *device)
{
g_return_val_if_fail (GDK_IS_DEVICE (device), FALSE);
return device->has_cursor;
}
/**
* gdk_device_get_source:
* @device: a #GdkDevice
*
* Determines the type of the device.
*
* Return value: a #GdkInputSource
*
* Since: 2.20
**/
GdkInputSource
gdk_device_get_source (GdkDevice *device)
{
g_return_val_if_fail (GDK_IS_DEVICE (device), 0);
return device->source;
}
/**
* gdk_device_set_source:
* @device: a #GdkDevice.
* @source: the source type.
*
* Sets the source type for an input device.
**/
void
gdk_device_set_source (GdkDevice *device,
GdkInputSource source)
{
g_return_if_fail (GDK_IS_DEVICE (device));
device->source = source;
}
/**
* gdk_device_get_mode:
* @device: a #GdkDevice
*
* Determines the mode of the device.
*
* Return value: a #GdkInputSource
*
* Since: 2.20
**/
GdkInputMode
gdk_device_get_mode (GdkDevice *device)
{
g_return_val_if_fail (GDK_IS_DEVICE (device), 0);
return device->mode;
}
/**
* gdk_device_set_mode:
* @device: a #GdkDevice.
* @mode: the input mode.
*
* Sets a the mode of an input device. The mode controls if the
* device is active and whether the device's range is mapped to the
* entire screen or to a single window.
*
* Returns: %TRUE if the mode was successfully changed.
**/
gboolean
gdk_device_set_mode (GdkDevice *device,
GdkInputMode mode)
{
g_return_val_if_fail (GDK_IS_DEVICE (device), FALSE);
if (device->mode == mode)
return TRUE;
if (mode == GDK_MODE_DISABLED &&
gdk_device_get_device_type (device) == GDK_DEVICE_TYPE_MASTER)
return FALSE;
/* FIXME: setting has_cursor when mode is window? */
device->mode = mode;
g_object_notify (G_OBJECT (device), "input-mode");
if (gdk_device_get_device_type (device) != GDK_DEVICE_TYPE_MASTER)
_gdk_input_check_extension_events (device);
return TRUE;
}
/**
* gdk_device_get_key:
* @device: a #GdkDevice.
* @index_: the index of the macro button to get.
* @keyval: return value for the keyval.
* @modifiers: return value for modifiers.
*
* If @index_ has a valid keyval, this function will return %TRUE
* and fill in @keyval and @modifiers with the keyval settings.
*
* Returns: %TRUE if keyval is set for @index.
*
* Since: 2.20
**/
gboolean
gdk_device_get_key (GdkDevice *device,
guint index_,
guint *keyval,
GdkModifierType *modifiers)
{
g_return_val_if_fail (GDK_IS_DEVICE (device), FALSE);
g_return_val_if_fail (index_ < device->num_keys, FALSE);
if (!device->keys[index_].keyval &&
!device->keys[index_].modifiers)
return FALSE;
if (keyval)
*keyval = device->keys[index_].keyval;
if (modifiers)
*modifiers = device->keys[index_].modifiers;
return TRUE;
}
/**
* gdk_device_set_key:
* @device: a #GdkDevice
* @index_: the index of the macro button to set
* @keyval: the keyval to generate
* @modifiers: the modifiers to set
*
* Specifies the X key event to generate when a macro button of a device
* is pressed.
**/
void
gdk_device_set_key (GdkDevice *device,
guint index_,
guint keyval,
GdkModifierType modifiers)
{
g_return_if_fail (GDK_IS_DEVICE (device));
g_return_if_fail (index_ < device->num_keys);
device->keys[index_].keyval = keyval;
device->keys[index_].modifiers = modifiers;
}
/**
* gdk_device_get_axis_use:
* @device: a #GdkDevice.
* @index_: the index of the axis.
*
* Returns the axis use for @index_.
*
* Returns: a #GdkAxisUse specifying how the axis is used.
*
* Since: 2.20
**/
GdkAxisUse
gdk_device_get_axis_use (GdkDevice *device,
guint index_)
{
g_return_val_if_fail (GDK_IS_DEVICE (device), GDK_AXIS_IGNORE);
g_return_val_if_fail (index_ < device->num_axes, GDK_AXIS_IGNORE);
return device->axes[index_].use;
}
/**
* gdk_device_set_axis_use:
* @device: a #GdkDevice
* @index_: the index of the axis
* @use: specifies how the axis is used
*
* Specifies how an axis of a device is used.
**/
void
gdk_device_set_axis_use (GdkDevice *device,
guint index_,
GdkAxisUse use)
{
GdkDevicePrivate *priv;
GdkAxisInfo *info;
g_return_if_fail (GDK_IS_DEVICE (device));
g_return_if_fail (index_ < device->num_axes);
priv = device->priv;
info = &g_array_index (priv->axes, GdkAxisInfo, index_);
info->use = use;
device->axes[index_].use = use;
switch (use)
{
case GDK_AXIS_X:
case GDK_AXIS_Y:
device->axes[index_].min = info->min_axis = 0;
device->axes[index_].max = info->max_axis = 0;
break;
case GDK_AXIS_XTILT:
case GDK_AXIS_YTILT:
device->axes[index_].min = info->min_axis = -1;
device->axes[index_].max = info->max_axis = 1;
break;
default:
device->axes[index_].min = info->min_axis = 0;
device->axes[index_].max = info->max_axis = 1;
break;
}
}
/**
* gdk_device_get_display:
* @device: a #GdkDevice
*
* Returns the #GdkDisplay to which @device pertains.
*
* Returns: a #GdkDisplay. This memory is owned by GTK+,
* and must not be freed or unreffed.
*
* Since: 3.0
**/
GdkDisplay *
gdk_device_get_display (GdkDevice *device)
{
GdkDevicePrivate *priv;
g_return_val_if_fail (GDK_IS_DEVICE (device), NULL);
priv = device->priv;
return priv->display;
}
/**
* gdk_device_get_associated_device:
* @device: a #GdkDevice
*
* Returns the associated device to @device, if @device is of type
* %GDK_DEVICE_TYPE_MASTER, it will return the paired pointer or
* keyboard.
*
* If @device is of type %GDK_DEVICE_TYPE_SLAVE, it will return
* the master device to which @device is attached to.
*
* If @device is of type %GDK_DEVICE_TYPE_FLOATING, %NULL will be
* returned, as there is no associated device.
*
* Returns: The associated device, or %NULL
*
* Since: 3.0
**/
GdkDevice *
gdk_device_get_associated_device (GdkDevice *device)
{
GdkDevicePrivate *priv;
g_return_val_if_fail (GDK_IS_DEVICE (device), NULL);
priv = device->priv;
return priv->associated;
}
void
_gdk_device_set_associated_device (GdkDevice *device,
GdkDevice *associated)
{
GdkDevicePrivate *priv;
g_return_if_fail (GDK_IS_DEVICE (device));
g_return_if_fail (GDK_IS_DEVICE (associated));
priv = device->priv;
if (priv->associated == associated)
return;
if (priv->associated)
{
g_object_unref (priv->associated);
priv->associated = NULL;
}
if (associated)
priv->associated = g_object_ref (associated);
}
/**
* gdk_device_get_device_type:
* @device: a #GdkDevice
*
* Returns the device type for @device.
*
* Returns: the #GdkDeviceType for @device.
*
* Since: 3.0
**/
GdkDeviceType
gdk_device_get_device_type (GdkDevice *device)
{
GdkDevicePrivate *priv;
g_return_val_if_fail (GDK_IS_DEVICE (device), GDK_DEVICE_TYPE_MASTER);
priv = device->priv;
return priv->type;
}
/**
* gdk_device_get_n_axes:
* @device: a #GdkDevice
*
* Returns the number of axes the device currently has.
*
* Returns: the number of axes.
*
* Since: 3.0
**/
guint
gdk_device_get_n_axes (GdkDevice *device)
{
g_return_val_if_fail (GDK_IS_DEVICE (device), 0);
return device->num_axes;
}
/**
* gdk_device_list_axes:
* @device: a #GdkDevice
*
* Returns a #GList of #GdkAtom<!-- -->s, containing the labels for
* the axes that @device currently has.
*
* Returns: A #GList of #GdkAtom<!-- -->s, free with g_list_free().
*
* Since: 3.0
**/
GList *
gdk_device_list_axes (GdkDevice *device)
{
GdkDevicePrivate *priv;
GList *axes = NULL;
gint i;
priv = device->priv;
for (i = 0; i < priv->axes->len; i++)
{
GdkAxisInfo axis_info;
axis_info = g_array_index (priv->axes, GdkAxisInfo, i);
axes = g_list_prepend (axes, GDK_ATOM_TO_POINTER (axis_info.label));
}
return g_list_reverse (axes);
}
/**
* gdk_device_get_axis_value:
* @device: a #GdkDevice.
* @axes: pointer to an array of axes
* @axis_label: #GdkAtom with the axis label.
* @value: location to store the found value.
*
* Interprets an array of double as axis values for a given device,
* and locates the value in the array for a given axis label, as returned
* by gdk_device_list_axes()
*
* Returns: %TRUE if the given axis use was found, otherwise %FALSE.
*
* Since: 3.0
**/
gboolean
gdk_device_get_axis_value (GdkDevice *device,
gdouble *axes,
GdkAtom axis_label,
gdouble *value)
{
GdkDevicePrivate *priv;
gint i;
g_return_val_if_fail (GDK_IS_DEVICE (device), FALSE);
if (axes == NULL)
return FALSE;
priv = device->priv;
for (i = 0; i < priv->axes->len; i++)
{
GdkAxisInfo axis_info;
axis_info = g_array_index (priv->axes, GdkAxisInfo, i);
if (axis_info.label != axis_label)
continue;
if (value)
*value = axes[i];
return TRUE;
}
return FALSE;
}
/**
* gdk_device_get_axis:
* @device: a #GdkDevice
* @axes: pointer to an array of axes
* @use: the use to look for
* @value: location to store the found value.
*
* Interprets an array of double as axis values for a given device,
* and locates the value in the array for a given axis use.
*
* Return value: %TRUE if the given axis use was found, otherwise %FALSE
**/
gboolean
gdk_device_get_axis (GdkDevice *device,
gdouble *axes,
GdkAxisUse use,
gdouble *value)
{
GdkDevicePrivate *priv;
gint i;
g_return_val_if_fail (GDK_IS_DEVICE (device), FALSE);
if (axes == NULL)
return FALSE;
priv = device->priv;
g_return_val_if_fail (priv->axes != NULL, FALSE);
for (i = 0; i < priv->axes->len; i++)
{
GdkAxisInfo axis_info;
axis_info = g_array_index (priv->axes, GdkAxisInfo, i);
if (axis_info.use != use)
continue;
if (value)
*value = axes[i];
return TRUE;
}
return FALSE;
}
static GdkEventMask
get_native_grab_event_mask (GdkEventMask grab_mask)
{
/* Similar to the above but for pointer events only */
return
GDK_POINTER_MOTION_MASK |
GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK |
GDK_SCROLL_MASK |
(grab_mask &
~(GDK_POINTER_MOTION_HINT_MASK |
GDK_BUTTON_MOTION_MASK |
GDK_BUTTON1_MOTION_MASK |
GDK_BUTTON2_MOTION_MASK |
GDK_BUTTON3_MOTION_MASK));
}
/**
* gdk_device_grab:
* @device: a #GdkDevice
* @window: the #GdkWindow which will own the grab (the grab window)
* @grab_ownership: specifies the grab ownership.
* @owner_events: if %FALSE then all device events are reported with respect to
* @window 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 @window and only if selected by
* @event_mask. In either mode, unreported events are discarded.
* @event_mask: specifies the event mask, which is used in accordance with
* @owner_events.
* @cursor: the cursor to display while the grab is active if the device is
* a pointer. If this is %NULL then the normal cursors are used for
* @window and its descendants, and the cursor for @window is used
* elsewhere.
* @time_: the timestamp of the event which led to this pointer grab. This
* usually comes from the #GdkEvent struct, though %GDK_CURRENT_TIME
* can be used if the time isn't known.
*
* Grabs the device so that all events coming from this device are passed to
* this application until the device is ungrabbed with gdk_device_ungrab(),
* or the window becomes unviewable. This overrides any previous grab on the device
* by this client.
*
* Device grabs are used for operations which need complete control over the
* given device events (either pointer or keyboard). For example in GTK+ this
* is used for Drag and Drop operations, popup menus and such.
*
* Note that if the event mask of an X window has selected both button press
* and button release events, then a button press event will cause an automatic
* pointer grab until the button is released. X does this automatically since
* most applications expect to receive button press and release events in pairs.
* It is equivalent to a pointer grab on the window with @owner_events set to
* %TRUE.
*
* 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.
*
* Since: 3.0
**/
GdkGrabStatus
gdk_device_grab (GdkDevice *device,
GdkWindow *window,
GdkGrabOwnership grab_ownership,
gboolean owner_events,
GdkEventMask event_mask,
GdkCursor *cursor,
guint32 time_)
{
GdkGrabStatus res;
GdkWindow *native;
g_return_val_if_fail (GDK_IS_DEVICE (device), 0);
g_return_val_if_fail (GDK_IS_WINDOW (window), 0);
if (_gdk_native_windows)
native = window;
else
native = gdk_window_get_toplevel (window);
while (((GdkWindowObject *) native)->window_type == GDK_WINDOW_OFFSCREEN)
{
native = gdk_offscreen_window_get_embedder (native);
if (native == NULL ||
(!_gdk_window_has_impl (native) &&
!gdk_window_is_viewable (native)))
return GDK_GRAB_NOT_VIEWABLE;
native = gdk_window_get_toplevel (native);
}
res = _gdk_windowing_device_grab (device,
window,
native,
owner_events,
get_native_grab_event_mask (event_mask),
NULL,
cursor,
time_);
if (res == GDK_GRAB_SUCCESS)
{
GdkDisplay *display;
gulong serial;
display = gdk_drawable_get_display (window);
serial = _gdk_windowing_window_get_next_serial (display);
_gdk_display_add_device_grab (display,
device,
window,
native,
grab_ownership,
owner_events,
event_mask,
serial,
time_,
FALSE);
}
return res;
}
/* Private API */
void
_gdk_device_reset_axes (GdkDevice *device)
{
GdkDevicePrivate *priv;
gint i;
priv = device->priv;
for (i = priv->axes->len - 1; i >= 0; i--)
g_array_remove_index (priv->axes, i);
g_object_notify (G_OBJECT (device), "n-axes");
/* This is done for backwards compatibility */
g_free (device->axes);
device->axes = NULL;
}
guint
_gdk_device_add_axis (GdkDevice *device,
GdkAtom label_atom,
GdkAxisUse use,
gdouble min_value,
gdouble max_value,
gdouble resolution)
{
GdkDevicePrivate *priv;
GdkAxisInfo axis_info;
guint pos;
priv = device->priv;
axis_info.use = use;
axis_info.label = label_atom;
axis_info.min_value = min_value;
axis_info.max_value = max_value;
axis_info.resolution = resolution;
switch (use)
{
case GDK_AXIS_X:
case GDK_AXIS_Y:
axis_info.min_axis = 0;
axis_info.max_axis = 0;
break;
case GDK_AXIS_XTILT:
case GDK_AXIS_YTILT:
axis_info.min_axis = -1;
axis_info.max_axis = 1;
break;
default:
axis_info.min_axis = 0;
axis_info.max_axis = 1;
break;
}
priv->axes = g_array_append_val (priv->axes, axis_info);
device->num_axes = priv->axes->len;
pos = device->num_axes - 1;
/* This is done for backwards compatibility, since the public
* struct doesn't actually store the device data.
*/
device->axes = g_realloc (device->axes, sizeof (GdkDeviceAxis) * priv->axes->len);
device->axes[pos].use = axis_info.use;
device->axes[pos].min = axis_info.min_axis;
device->axes[pos].max = axis_info.max_axis;
g_object_notify (G_OBJECT (device), "n-axes");
return pos;
}
void
_gdk_device_set_keys (GdkDevice *device,
guint num_keys)
{
if (device->keys)
g_free (device->keys);
device->num_keys = num_keys;
device->keys = g_new0 (GdkDeviceKey, num_keys);
}
static GdkAxisInfo *
find_axis_info (GArray *array,
GdkAxisUse use)
{
GdkAxisInfo *info;
gint i;
for (i = 0; i < GDK_AXIS_LAST; i++)
{
info = &g_array_index (array, GdkAxisInfo, i);
if (info->use == use)
return info;
}
return NULL;
}
GdkAxisUse
_gdk_device_get_axis_use (GdkDevice *device,
guint index_)
{
GdkDevicePrivate *priv;
GdkAxisInfo info;
priv = device->priv;
info = g_array_index (priv->axes, GdkAxisInfo, index_);
return info.use;
}
gboolean
_gdk_device_translate_window_coord (GdkDevice *device,
GdkWindow *window,
guint index_,
gdouble value,
gdouble *axis_value)
{
GdkDevicePrivate *priv;
GdkAxisInfo axis_info;
GdkAxisInfo *axis_info_x, *axis_info_y;
gdouble device_width, device_height;
gdouble x_offset, y_offset;
gdouble x_scale, y_scale;
gdouble x_min, y_min;
gdouble x_resolution, y_resolution;
gdouble device_aspect;
gint window_width, window_height;
GdkWindowObject *window_private;
priv = device->priv;
if (index_ >= priv->axes->len)
return FALSE;
axis_info = g_array_index (priv->axes, GdkAxisInfo, index_);
if (axis_info.use != GDK_AXIS_X &&
axis_info.use != GDK_AXIS_Y)
return FALSE;
if (axis_info.use == GDK_AXIS_X)
{
axis_info_x = &axis_info;
axis_info_y = find_axis_info (priv->axes, GDK_AXIS_Y);
}
else
{
axis_info_x = find_axis_info (priv->axes, GDK_AXIS_X);
axis_info_y = &axis_info;
}
device_width = axis_info_x->max_value - axis_info_x->min_value;
device_height = axis_info_y->max_value - axis_info_y->min_value;
if (device_width > 0)
x_min = axis_info_x->min_value;
else
{
device_width = gdk_screen_get_width (gdk_drawable_get_screen (window));
x_min = 0;
}
if (device_height > 0)
y_min = axis_info_y->min_value;
else
{
device_height = gdk_screen_get_height (gdk_drawable_get_screen (window));
y_min = 0;
}
window_private = (GdkWindowObject *) window;
gdk_drawable_get_size (window, &window_width, &window_height);
x_resolution = axis_info_x->resolution;
y_resolution = axis_info_y->resolution;
/*
* Some drivers incorrectly report the resolution of the device
* as zero (in partiular linuxwacom < 0.5.3 with usb tablets).
* This causes the device_aspect to become NaN and totally
* breaks windowed mode. If this is the case, the best we can
* do is to assume the resolution is non-zero is equal in both
* directions (which is true for many devices). The absolute
* value of the resolution doesn't matter since we only use the
* ratio.
*/
if (x_resolution == 0 || y_resolution == 0)
{
x_resolution = 1;
y_resolution = 1;
}
device_aspect = (device_height * y_resolution) /
(device_width * x_resolution);
if (device_aspect * window_width >= window_height)
{
/* device taller than window */
x_scale = window_width / device_width;
y_scale = (x_scale * x_resolution) / y_resolution;
x_offset = 0;
y_offset = - (device_height * y_scale - window_height) / 2;
}
else
{
/* window taller than device */
y_scale = window_height / device_height;
x_scale = (y_scale * y_resolution) / x_resolution;
y_offset = 0;
x_offset = - (device_width * x_scale - window_width) / 2;
}
if (axis_value)
{
if (axis_info.use == GDK_AXIS_X)
*axis_value = x_offset + x_scale * (value - x_min);
else
*axis_value = y_offset + y_scale * (value - y_min);
}
return TRUE;
}
gboolean
_gdk_device_translate_screen_coord (GdkDevice *device,
GdkWindow *window,
gint window_root_x,
gint window_root_y,
guint index_,
gdouble value,
gdouble *axis_value)
{
GdkDevicePrivate *priv;
GdkAxisInfo axis_info;
gdouble axis_width, scale, offset;
GdkWindowObject *window_private;
if (device->mode != GDK_MODE_SCREEN)
return FALSE;
priv = device->priv;
if (index_ >= priv->axes->len)
return FALSE;
axis_info = g_array_index (priv->axes, GdkAxisInfo, index_);
if (axis_info.use != GDK_AXIS_X &&
axis_info.use != GDK_AXIS_Y)
return FALSE;
axis_width = axis_info.max_value - axis_info.min_value;
window_private = (GdkWindowObject *) window;
if (axis_info.use == GDK_AXIS_X)
{
if (axis_width > 0)
scale = gdk_screen_get_width (gdk_drawable_get_screen (window)) / axis_width;
else
scale = 1;
offset = - window_root_x - window_private->abs_x;
}
else
{
if (axis_width > 0)
scale = gdk_screen_get_height (gdk_drawable_get_screen (window)) / axis_width;
else
scale = 1;
offset = - window_root_y - window_private->abs_y;
}
if (axis_value)
*axis_value = offset + scale * (value - axis_info.min_value);
return TRUE;
}
gboolean
_gdk_device_translate_axis (GdkDevice *device,
guint index_,
gdouble value,
gdouble *axis_value)
{
GdkDevicePrivate *priv;
GdkAxisInfo axis_info;
gdouble axis_width, out;
priv = device->priv;
if (index_ >= priv->axes->len)
return FALSE;
axis_info = g_array_index (priv->axes, GdkAxisInfo, index_);
if (axis_info.use == GDK_AXIS_X ||
axis_info.use == GDK_AXIS_Y)
return FALSE;
axis_width = axis_info.max_value - axis_info.min_value;
out = (axis_info.max_axis * (value - axis_info.min_value) +
axis_info.min_axis * (axis_info.max_value - value)) / axis_width;
if (axis_value)
*axis_value = out;
return TRUE;
}
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