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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/exo/wayland/zwp_pointer_constraints.h"
#include <pointer-constraints-unstable-v1-server-protocol.h>
#include <wayland-server-core.h>
#include <wayland-server-protocol-core.h>
#include <cstdarg>
#include <memory>
#include "base/memory/raw_ptr.h"
#include "components/exo/pointer.h"
#include "components/exo/pointer_constraint_delegate.h"
#include "components/exo/wayland/server_util.h"
#include "third_party/skia/include/core/SkRegion.h"
namespace exo {
namespace wayland {
namespace {
// Implements a PointerConstraintDelegate in terms of the zwp_locked_pointer
// Wayland protocol.
//
// Lifetime note: The underlying Wayland protocol gives control over this
// object's lifetime to the client. However, it's possible that its
// dependencies could be destroyed prior to the client destroying it.
// At this point we consider the object "defunct" and its |surface_| member
// to be potentially dangling. |pointer_| is correctly nulled when appropriate.
class WaylandPointerConstraintDelegate : public PointerConstraintDelegate {
public:
WaylandPointerConstraintDelegate(wl_resource* constraint_resource,
Surface* surface,
Pointer* pointer,
SkRegion* region,
uint32_t lifetime)
: constraint_resource_(constraint_resource),
pointer_(pointer),
surface_(surface),
is_persistent_(lifetime ==
ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT) {
pointer->ConstrainPointer(this);
}
~WaylandPointerConstraintDelegate() override {
if (pointer_) {
pointer_->OnPointerConstraintDelegateDestroying(this);
pointer_ = nullptr;
}
}
// PointerConstraintDelegate::
void OnConstraintActivated() override { SendLocked(); }
void OnAlreadyConstrained() override {
wl_resource_post_error(
constraint_resource_.get(),
ZWP_POINTER_CONSTRAINTS_V1_ERROR_ALREADY_CONSTRAINED,
"A pointer constraint was already requested for this wl_pointer "
"on this wl_surface.");
}
void OnConstraintBroken() override { SendUnlocked(); }
bool IsPersistent() override { return is_persistent_; }
Surface* GetConstrainedSurface() override { return surface_; }
void OnDefunct() override { pointer_ = nullptr; }
private:
// Inform the client of the state of the lock.
void SendLocked() {
VLOG(1) << "send_locked(" << constraint_resource_ << ")";
zwp_locked_pointer_v1_send_locked(constraint_resource_);
}
void SendUnlocked() {
VLOG(1) << "send_unlocked(" << constraint_resource_ << ")";
zwp_locked_pointer_v1_send_unlocked(constraint_resource_);
}
const raw_ptr<wl_resource, ExperimentalAsh> constraint_resource_;
raw_ptr<Pointer, ExperimentalAsh> pointer_;
const raw_ptr<Surface, ExperimentalAsh> surface_;
bool is_persistent_;
};
////////////////////////////////////////////////////////////////////////////////
// zwp_locked_pointer
void locked_pointer_destroy(wl_client* client, wl_resource* resource) {
VLOG(1) << "locked_pointer_destroy(" << client << ", " << resource << ")";
wl_resource_destroy(resource);
}
void locked_pointer_set_cursor_position_hint(wl_client* client,
wl_resource* resource,
wl_fixed_t surface_x,
wl_fixed_t surface_y) {
// Not supported.
}
void locked_pointer_set_region(wl_client* client,
wl_resource* resource,
wl_resource* region_resource) {
// Not supported.
}
const struct zwp_locked_pointer_v1_interface locked_pointer_implementation = {
locked_pointer_destroy, locked_pointer_set_cursor_position_hint,
locked_pointer_set_region};
////////////////////////////////////////////////////////////////////////////////
// zwp_confined_pointer
void confined_pointer_destroy(wl_client* client, wl_resource* resource) {
wl_resource_destroy(resource);
}
void confined_pointer_set_region(wl_client* client,
wl_resource* resource,
wl_resource* region_resource) {
// Not supported.
}
const struct zwp_confined_pointer_v1_interface confined_pointer_implementation =
{
confined_pointer_destroy,
confined_pointer_set_region,
};
////////////////////////////////////////////////////////////////////////////////
// zwp_pointer_constraints
void pointer_constraints_destroy(wl_client* client, wl_resource* resource) {
VLOG(1) << "pointer_constraints_destroy(" << client << ", " << resource
<< ")";
wl_resource_destroy(resource);
}
void pointer_constraints_lock_pointer(wl_client* client,
wl_resource* resource,
uint32_t id,
wl_resource* surface_resource,
wl_resource* pointer_resource,
wl_resource* region_resource,
uint32_t lifetime) {
Surface* surface = GetUserDataAs<Surface>(surface_resource);
Pointer* pointer = GetUserDataAs<Pointer>(pointer_resource);
SkRegion* region =
region_resource ? GetUserDataAs<SkRegion>(region_resource) : nullptr;
VLOG(1) << "lock_pointer(" << client << ", " << resource << "; Surface "
<< surface << " @ window '"
<< (surface && surface->window() ? surface->window()->GetTitle()
: base::EmptyString16())
<< "', "
<< "Pointer " << pointer << ")";
wl_resource* locked_pointer_resource =
wl_resource_create(client, &zwp_locked_pointer_v1_interface, 1, id);
SetImplementation(
locked_pointer_resource, &locked_pointer_implementation,
std::make_unique<WaylandPointerConstraintDelegate>(
locked_pointer_resource, surface, pointer, region, lifetime));
}
void pointer_constraints_confine_pointer(wl_client* client,
wl_resource* resource,
uint32_t id,
wl_resource* surface_resource,
wl_resource* pointer_resource,
wl_resource* region_resource,
uint32_t lifetime) {
// Confined pointer is not currently supported.
wl_resource* confined_pointer_resource =
wl_resource_create(client, &zwp_confined_pointer_v1_interface, 1, id);
SetImplementation<int>(confined_pointer_resource,
&confined_pointer_implementation, nullptr);
}
const struct zwp_pointer_constraints_v1_interface
pointer_constraints_implementation = {pointer_constraints_destroy,
pointer_constraints_lock_pointer,
pointer_constraints_confine_pointer};
} // namespace
void bind_pointer_constraints(wl_client* client,
void* data,
uint32_t version,
uint32_t id) {
wl_resource* resource = wl_resource_create(
client, &zwp_pointer_constraints_v1_interface, version, id);
wl_resource_set_implementation(resource, &pointer_constraints_implementation,
data, nullptr);
}
} // namespace wayland
} // namespace exo
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