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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* Copyright (C) 2015 Red Hat
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* Written by:
* Jonas Ådahl <jadahl@gmail.com>
*/
/**
* SECTION:meta-pointer-constraint
* @title: MetaPointerConstraint
* @short_description: Pointer client constraints.
*
* A MetaPointerConstraint can be used to implement any kind of pointer
* constraint as requested by a client, such as cursor lock.
*
* Examples of pointer constraints are "pointer confinement" and "pointer
* locking" (as defined in the wayland pointer constraint protocol extension),
* which restrict movement in relation to a given client.
*/
#include "config.h"
#include "backends/meta-pointer-constraint.h"
#ifdef HAVE_NATIVE_BACKEND
#include "backends/native/meta-backend-native.h"
#include "backends/native/meta-pointer-constraint-native.h"
#endif
#include <glib-object.h>
struct _MetaPointerConstraint
{
GObject parent_instance;
cairo_region_t *region;
double min_edge_distance;
};
G_DEFINE_TYPE (MetaPointerConstraint, meta_pointer_constraint, G_TYPE_OBJECT);
G_DEFINE_TYPE (MetaPointerConstraintImpl, meta_pointer_constraint_impl,
G_TYPE_OBJECT);
static void
meta_pointer_constraint_finalize (GObject *object)
{
MetaPointerConstraint *constraint = META_POINTER_CONSTRAINT (object);
g_clear_pointer (&constraint->region, cairo_region_destroy);
G_OBJECT_CLASS (meta_pointer_constraint_parent_class)->finalize (object);
}
static void
meta_pointer_constraint_init (MetaPointerConstraint *constraint)
{
}
static void
meta_pointer_constraint_class_init (MetaPointerConstraintClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = meta_pointer_constraint_finalize;
}
MetaPointerConstraint *
meta_pointer_constraint_new (const cairo_region_t *region,
double min_edge_distance)
{
MetaPointerConstraint *constraint;
constraint = g_object_new (META_TYPE_POINTER_CONSTRAINT, NULL);
constraint->region = cairo_region_copy (region);
constraint->min_edge_distance = min_edge_distance;
return constraint;
}
cairo_region_t *
meta_pointer_constraint_get_region (MetaPointerConstraint *constraint)
{
return constraint->region;
}
double
meta_pointer_constraint_get_min_edge_distance (MetaPointerConstraint *constraint)
{
return constraint->min_edge_distance;
}
static void
meta_pointer_constraint_impl_init (MetaPointerConstraintImpl *constraint_impl)
{
}
static void
meta_pointer_constraint_impl_class_init (MetaPointerConstraintImplClass *klass)
{
}
/**
* meta_pointer_constraint_impl_constrain:
* @constraint_impl: a #MetaPointerConstraintImpl.
* @device; the device of the pointer.
* @time: the timestamp (in ms) of the event.
* @prev_x: X-coordinate of the previous pointer position.
* @prev_y: Y-coordinate of the previous pointer position.
* @x: The modifiable X-coordinate to which the pointer would like to go to.
* @y: The modifiable Y-coordinate to which the pointer would like to go to.
*
* Constrains the pointer movement from point (@prev_x, @prev_y) to (@x, @y),
* if needed.
*/
void
meta_pointer_constraint_impl_constrain (MetaPointerConstraintImpl *constraint_impl,
ClutterInputDevice *device,
uint32_t time,
float prev_x,
float prev_y,
float *x,
float *y)
{
META_POINTER_CONSTRAINT_IMPL_GET_CLASS (constraint_impl)->constrain (constraint_impl,
device,
time,
prev_x, prev_y,
x, y);
}
void
meta_pointer_constraint_impl_ensure_constrained (MetaPointerConstraintImpl *constraint_impl,
ClutterInputDevice *device)
{
META_POINTER_CONSTRAINT_IMPL_GET_CLASS (constraint_impl)->ensure_constrained (constraint_impl,
device);
}
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