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// Copyright 2018 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/wayland_pointer_delegate.h"
#include <linux/input-event-codes.h>
#include <wayland-server-core.h>
#include <wayland-server-protocol-core.h>
#include "components/exo/pointer.h"
#include "components/exo/wayland/serial_tracker.h"
#include "components/exo/wayland/server_util.h"
#include "ui/events/event.h"
#include "ui/events/event_constants.h"
namespace exo {
namespace wayland {
WaylandPointerDelegate::WaylandPointerDelegate(wl_resource* pointer_resource,
SerialTracker* serial_tracker)
: pointer_resource_(pointer_resource), serial_tracker_(serial_tracker) {}
void WaylandPointerDelegate::OnPointerDestroying(Pointer* pointer) {
delete this;
}
bool WaylandPointerDelegate::CanAcceptPointerEventsForSurface(
Surface* surface) const {
wl_resource* surface_resource = GetSurfaceResource(surface);
// We can accept events for this surface if the client is the same as the
// pointer.
return surface_resource &&
wl_resource_get_client(surface_resource) == client();
}
void WaylandPointerDelegate::OnPointerEnter(Surface* surface,
const gfx::PointF& location,
int button_flags) {
wl_resource* surface_resource = GetSurfaceResource(surface);
DCHECK(surface_resource);
// Should we be sending button events to the client before the enter event
// if client's pressed button state is different from |button_flags|?
wl_pointer_send_enter(
pointer_resource_,
serial_tracker_->GetNextSerial(SerialTracker::EventType::POINTER_ENTER),
surface_resource, wl_fixed_from_double(location.x()),
wl_fixed_from_double(location.y()));
}
void WaylandPointerDelegate::OnPointerLeave(Surface* surface) {
wl_resource* surface_resource = GetSurfaceResource(surface);
DCHECK(surface_resource);
wl_pointer_send_leave(
pointer_resource_,
serial_tracker_->GetNextSerial(SerialTracker::EventType::POINTER_LEAVE),
surface_resource);
}
void WaylandPointerDelegate::OnPointerMotion(base::TimeTicks time_stamp,
const gfx::PointF& location) {
SendTimestamp(time_stamp);
wl_pointer_send_motion(pointer_resource_, TimeTicksToMilliseconds(time_stamp),
wl_fixed_from_double(location.x()),
wl_fixed_from_double(location.y()));
}
void WaylandPointerDelegate::OnPointerButton(base::TimeTicks time_stamp,
int button_flags,
bool pressed) {
struct {
ui::EventFlags flag;
uint32_t value;
} buttons[] = {
{ui::EF_LEFT_MOUSE_BUTTON, BTN_LEFT},
{ui::EF_RIGHT_MOUSE_BUTTON, BTN_RIGHT},
{ui::EF_MIDDLE_MOUSE_BUTTON, BTN_MIDDLE},
{ui::EF_FORWARD_MOUSE_BUTTON, BTN_EXTRA},
{ui::EF_BACK_MOUSE_BUTTON, BTN_SIDE},
};
for (auto button : buttons) {
if (button_flags & button.flag) {
SendTimestamp(time_stamp);
SerialTracker::EventType event_type =
pressed ? SerialTracker::EventType::POINTER_BUTTON_DOWN
: SerialTracker::EventType::POINTER_BUTTON_UP;
wl_pointer_send_button(pointer_resource_,
serial_tracker_->GetNextSerial(event_type),
TimeTicksToMilliseconds(time_stamp), button.value,
pressed ? WL_POINTER_BUTTON_STATE_PRESSED
: WL_POINTER_BUTTON_STATE_RELEASED);
}
}
}
void WaylandPointerDelegate::OnPointerScroll(base::TimeTicks time_stamp,
const gfx::Vector2dF& offset,
bool discrete) {
// The unit aura considers to be "one scroll tick".
const int kAuraScrollUnit = ui::MouseWheelEvent::kWheelDelta;
// Weston, the reference compositor, treats one scroll tick as 10 units, with
// no acceleration applied.
constexpr int kWaylandScrollUnit = 10;
// The ratio between the wayland and aura unit sizes. Multiplying by this
// converts from aura units to wayland units, dividing does the reverse.
const double kAxisStepDistance = static_cast<double>(kWaylandScrollUnit) /
static_cast<double>(kAuraScrollUnit);
if (wl_resource_get_version(pointer_resource_) >=
WL_POINTER_AXIS_SOURCE_SINCE_VERSION) {
int32_t axis_source =
discrete ? WL_POINTER_AXIS_SOURCE_WHEEL : WL_POINTER_AXIS_SOURCE_FINGER;
wl_pointer_send_axis_source(pointer_resource_, axis_source);
}
double x_value = -offset.x() * kAxisStepDistance;
double y_value = -offset.y() * kAxisStepDistance;
// ::axis_discrete events must be sent before their corresponding ::axis
// events, per the specification.
if (wl_resource_get_version(pointer_resource_) >=
WL_POINTER_AXIS_DISCRETE_SINCE_VERSION &&
discrete) {
// Ensure that we never round the discrete value down to 0.
int discrete_x = static_cast<int>(x_value / kWaylandScrollUnit);
if (discrete_x == 0 && x_value != 0) {
discrete_x = copysign(1, x_value);
}
int discrete_y = static_cast<int>(y_value / kWaylandScrollUnit);
if (discrete_y == 0 && y_value != 0) {
discrete_y = copysign(1, y_value);
}
wl_pointer_send_axis_discrete(
pointer_resource_, WL_POINTER_AXIS_HORIZONTAL_SCROLL, discrete_x);
wl_pointer_send_axis_discrete(pointer_resource_,
WL_POINTER_AXIS_VERTICAL_SCROLL, discrete_y);
}
SendTimestamp(time_stamp);
wl_pointer_send_axis(pointer_resource_, TimeTicksToMilliseconds(time_stamp),
WL_POINTER_AXIS_HORIZONTAL_SCROLL,
wl_fixed_from_double(x_value));
SendTimestamp(time_stamp);
wl_pointer_send_axis(pointer_resource_, TimeTicksToMilliseconds(time_stamp),
WL_POINTER_AXIS_VERTICAL_SCROLL,
wl_fixed_from_double(y_value));
}
void WaylandPointerDelegate::OnFingerScrollStop(base::TimeTicks time_stamp) {
if (wl_resource_get_version(pointer_resource_) >=
WL_POINTER_AXIS_STOP_SINCE_VERSION) {
wl_pointer_send_axis_source(pointer_resource_,
WL_POINTER_AXIS_SOURCE_FINGER);
SendTimestamp(time_stamp);
wl_pointer_send_axis_stop(pointer_resource_,
TimeTicksToMilliseconds(time_stamp),
WL_POINTER_AXIS_HORIZONTAL_SCROLL);
SendTimestamp(time_stamp);
wl_pointer_send_axis_stop(pointer_resource_,
TimeTicksToMilliseconds(time_stamp),
WL_POINTER_AXIS_VERTICAL_SCROLL);
}
}
void WaylandPointerDelegate::OnPointerFrame() {
if (wl_resource_get_version(pointer_resource_) >=
WL_POINTER_FRAME_SINCE_VERSION) {
wl_pointer_send_frame(pointer_resource_);
}
wl_client_flush(client());
}
wl_client* WaylandPointerDelegate::client() const {
return wl_resource_get_client(pointer_resource_);
}
} // namespace wayland
} // namespace exo
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