ui/aura/mus/mus_mouse_location_updater.cc

// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/aura/mus/mus_mouse_location_updater.h"

#include "ui/aura/client/screen_position_client.h"
#include "ui/aura/env.h"
#include "ui/events/event.h"

namespace aura {
namespace {

bool IsMouseEventWithLocation(const ui::Event& event) {
  // All mouse events except exited, capture, and wheel which mus doesn't
  // include locations for.
  switch (event.type()) {
    case ui::ET_MOUSE_PRESSED:
    case ui::ET_MOUSE_DRAGGED:
    case ui::ET_MOUSE_RELEASED:
    case ui::ET_MOUSE_MOVED:
    case ui::ET_MOUSE_ENTERED:
      return true;
    default:
      break;
  }
  return false;
}

}  // namespace

MusMouseLocationUpdater::MusMouseLocationUpdater() {
  base::RunLoop::AddNestingObserverOnCurrentThread(this);
}

MusMouseLocationUpdater::~MusMouseLocationUpdater() {
  base::RunLoop::RemoveNestingObserverOnCurrentThread(this);
}

void MusMouseLocationUpdater::OnEventProcessingStarted(const ui::Event& event) {
  Env* env = Env::GetInstance();
  if (!IsMouseEventWithLocation(event) || env->always_use_last_mouse_location_)
    return;

  is_processing_trigger_event_ = true;
  // event.target() may not exist in some tests.
  const gfx::Point screen_location =
      event.target() ? event.target()->GetScreenLocation(*event.AsMouseEvent())
                     : event.AsMouseEvent()->root_location();
  env->SetLastMouseLocation(screen_location);
  env->get_last_mouse_location_from_mus_ = false;
}

void MusMouseLocationUpdater::OnEventProcessingFinished() {
  UseCursorScreenPoint();
}

void MusMouseLocationUpdater::UseCursorScreenPoint() {
  if (!is_processing_trigger_event_)
    return;

  is_processing_trigger_event_ = false;
  Env::GetInstance()->get_last_mouse_location_from_mus_ = true;
}

void MusMouseLocationUpdater::OnBeginNestedRunLoop() {
  UseCursorScreenPoint();
}

}  // namespace aura