aura: Introduce EnvInputStateController for updating Env input states.

ui/aura/env_input_state_controller.cc

Index: ui/aura/env_input_state_controller.cc
diff --git a/ui/aura/env_input_state_controller.cc b/ui/aura/env_input_state_controller.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f476a117494c9b2235c04fc0af64865b64ae6c59
--- /dev/null
+++ b/ui/aura/env_input_state_controller.cc
@@ -0,0 +1,77 @@
+// Copyright 2016 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/env_input_state_controller.h"
+
+#include "ui/aura/client/screen_position_client.h"
+#include "ui/aura/env.h"
+#include "ui/events/event.h"
+#include "ui/gfx/geometry/point.h"
+
+namespace aura {
+
+void EnvInputStateController::UpdateStateForMouseEvent(
+    const Window* window,
+    const ui::MouseEvent& event) {
+  switch (event.type()) {
+    case ui::ET_MOUSE_PRESSED:
+      Env::GetInstance()->set_mouse_button_flags(event.button_flags());
+      break;
+    case ui::ET_MOUSE_RELEASED:
+      Env::GetInstance()->set_mouse_button_flags(
+          event.button_flags() & ~event.changed_button_flags());
+      break;
+    default:
+      break;
+  }
+
+  if (event.type() != ui::ET_MOUSE_CAPTURE_CHANGED &&
+      !(event.flags() & ui::EF_IS_SYNTHESIZED)) {
+    SetLastMouseLocation(window, event.root_location());
+  }
+}
+
+void EnvInputStateController::UpdateStateForTouchEvent(
+    const ui::TouchEvent& event) {
+  switch (event.type()) {
+    case ui::ET_TOUCH_PRESSED:
+      touch_ids_down_ |= (1 << event.touch_id());
+      Env::GetInstance()->set_touch_down(touch_ids_down_ != 0);
+      break;
+
+    // Handle ET_TOUCH_CANCELLED only if it has a native event.
+    case ui::ET_TOUCH_CANCELLED:
+      if (!event.HasNativeEvent())
+        break;
+    // fallthrough
+    case ui::ET_TOUCH_RELEASED:
+      touch_ids_down_ =
+          (touch_ids_down_ | (1 << event.touch_id())) ^ (1 << event.touch_id());
+      Env::GetInstance()->set_touch_down(touch_ids_down_ != 0);
+      break;
+
+    case ui::ET_TOUCH_MOVED:
+      break;
+
+    default:
+      NOTREACHED();
+      break;
+  }
+}
+
+void EnvInputStateController::SetLastMouseLocation(
+    const Window* root_window,
+    const gfx::Point& location_in_root) const {
+  client::ScreenPositionClient* client =
+      client::GetScreenPositionClient(root_window);
+  if (client) {
+    gfx::Point location_in_screen = location_in_root;
+    client->ConvertPointToScreen(root_window, &location_in_screen);
+    Env::GetInstance()->set_last_mouse_location(location_in_screen);
+  } else {
+    Env::GetInstance()->set_last_mouse_location(location_in_root);
+  }
+}
+
+}  // namespace aura