StructTraits to map mus::mojom::Event to unique_ptr<ui::Event>

ui/events/mojo/event_struct_traits.cc

Index: ui/events/mojo/event_struct_traits.cc
diff --git a/ui/events/mojo/event_struct_traits.cc b/ui/events/mojo/event_struct_traits.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4261f2a6544ffda750ab009f15b86a000195bb46
--- /dev/null
+++ b/ui/events/mojo/event_struct_traits.cc
@@ -0,0 +1,371 @@
+// 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/events/mojo/event_struct_traits.h"
+
+#include "components/mus/public/interfaces/input_event_constants.mojom.h"
+#include "ui/events/event.h"
+#include "ui/events/event_utils.h"
+#include "ui/events/keycodes/dom/keycode_converter.h"
+
+namespace mojo {
+namespace {
+
+mus::mojom::EventType UIEventTypeToMojo(ui::EventType type) {
+  switch (type) {
+    case ui::ET_MOUSE_PRESSED:
+    case ui::ET_TOUCH_PRESSED:
+    case ui::ET_POINTER_DOWN:
+      return mus::mojom::EventType::POINTER_DOWN;
+
+    case ui::ET_MOUSE_DRAGGED:
+    case ui::ET_MOUSE_MOVED:
+    case ui::ET_MOUSE_ENTERED:
+    case ui::ET_TOUCH_MOVED:
+    case ui::ET_POINTER_MOVED:
+      return mus::mojom::EventType::POINTER_MOVE;
+
+    case ui::ET_MOUSE_EXITED:
+    case ui::ET_POINTER_EXITED:
+      return mus::mojom::EventType::MOUSE_EXIT;
+
+    case ui::ET_MOUSEWHEEL:
+      return mus::mojom::EventType::WHEEL;
+
+    case ui::ET_MOUSE_RELEASED:
+    case ui::ET_TOUCH_RELEASED:
+    case ui::ET_POINTER_UP:
+      return mus::mojom::EventType::POINTER_UP;
+
+    case ui::ET_TOUCH_CANCELLED:
+    case ui::ET_POINTER_CANCELLED:
+      return mus::mojom::EventType::POINTER_CANCEL;
+
+    case ui::ET_KEY_PRESSED:
+      return mus::mojom::EventType::KEY_PRESSED;
+
+    case ui::ET_KEY_RELEASED:
+      return mus::mojom::EventType::KEY_RELEASED;
+
+    default:
+      break;
+  }
+  return mus::mojom::EventType::UNKNOWN;
+}
+
+ui::EventType MojoMouseEventTypeToUIEvent(mus::mojom::EventType action,
+                                          int32_t flags) {
+  switch (action) {
+    case mus::mojom::EventType::POINTER_DOWN:
+      return ui::ET_MOUSE_PRESSED;
+
+    case mus::mojom::EventType::POINTER_UP:
+      return ui::ET_MOUSE_RELEASED;
+
+    case mus::mojom::EventType::POINTER_MOVE:
+      if (flags & (mus::mojom::kEventFlagLeftMouseButton |
+                   mus::mojom::kEventFlagMiddleMouseButton |
+                   mus::mojom::kEventFlagRightMouseButton)) {
+        return ui::ET_MOUSE_DRAGGED;
+      }
+      return ui::ET_MOUSE_MOVED;
+
+    case mus::mojom::EventType::MOUSE_EXIT:
+      return ui::ET_MOUSE_EXITED;
+
+    default:
+      NOTREACHED();
+  }
+
+  return ui::ET_MOUSE_RELEASED;
+}
+
+ui::EventType MojoTouchEventTypeToUIEvent(mus::mojom::EventType action) {
+  switch (action) {
+    case mus::mojom::EventType::POINTER_DOWN:
+      return ui::ET_TOUCH_PRESSED;
+
+    case mus::mojom::EventType::POINTER_UP:
+      return ui::ET_TOUCH_RELEASED;
+
+    case mus::mojom::EventType::POINTER_MOVE:
+      return ui::ET_TOUCH_MOVED;
+
+    case mus::mojom::EventType::POINTER_CANCEL:
+      return ui::ET_TOUCH_CANCELLED;
+
+    default:
+      NOTREACHED();
+  }
+
+  return ui::ET_TOUCH_CANCELLED;
+}
+
+}  // namespace
+
+static_assert(mus::mojom::kEventFlagNone == static_cast<int32_t>(ui::EF_NONE),
+              "EVENT_FLAGS must match");
+static_assert(mus::mojom::kEventFlagIsSynthesized ==
+                  static_cast<int32_t>(ui::EF_IS_SYNTHESIZED),
+              "EVENT_FLAGS must match");
+static_assert(mus::mojom::kEventFlagShiftDown ==
+                  static_cast<int32_t>(ui::EF_SHIFT_DOWN),
+              "EVENT_FLAGS must match");
+static_assert(mus::mojom::kEventFlagControlDown ==
+                  static_cast<int32_t>(ui::EF_CONTROL_DOWN),
+              "EVENT_FLAGS must match");
+static_assert(mus::mojom::kEventFlagAltDown ==
+                  static_cast<int32_t>(ui::EF_ALT_DOWN),
+              "EVENT_FLAGS must match");
+static_assert(mus::mojom::kEventFlagCommandDown ==
+                  static_cast<int32_t>(ui::EF_COMMAND_DOWN),
+              "EVENT_FLAGS must match");
+static_assert(mus::mojom::kEventFlagAltgrDown ==
+                  static_cast<int32_t>(ui::EF_ALTGR_DOWN),
+              "EVENT_FLAGS must match");
+static_assert(mus::mojom::kEventFlagMod3Down ==
+                  static_cast<int32_t>(ui::EF_MOD3_DOWN),
+              "EVENT_FLAGS must match");
+static_assert(mus::mojom::kEventFlagNumLockOn ==
+                  static_cast<int32_t>(ui::EF_NUM_LOCK_ON),
+              "EVENT_FLAGS must match");
+static_assert(mus::mojom::kEventFlagCapsLockOn ==
+                  static_cast<int32_t>(ui::EF_CAPS_LOCK_ON),
+              "EVENT_FLAGS must match");
+static_assert(mus::mojom::kEventFlagScrollLockOn ==
+                  static_cast<int32_t>(ui::EF_SCROLL_LOCK_ON),
+              "EVENT_FLAGS must match");
+static_assert(mus::mojom::kEventFlagLeftMouseButton ==
+                  static_cast<int32_t>(ui::EF_LEFT_MOUSE_BUTTON),
+              "EVENT_FLAGS must match");
+static_assert(mus::mojom::kEventFlagMiddleMouseButton ==
+                  static_cast<int32_t>(ui::EF_MIDDLE_MOUSE_BUTTON),
+              "EVENT_FLAGS must match");
+static_assert(mus::mojom::kEventFlagRightMouseButton ==
+                  static_cast<int32_t>(ui::EF_RIGHT_MOUSE_BUTTON),
+              "EVENT_FLAGS must match");
+static_assert(mus::mojom::kEventFlagBackMouseButton ==
+                  static_cast<int32_t>(ui::EF_BACK_MOUSE_BUTTON),
+              "EVENT_FLAGS must match");
+static_assert(mus::mojom::kEventFlagForwardMouseButton ==
+                  static_cast<int32_t>(ui::EF_FORWARD_MOUSE_BUTTON),
+              "EVENT_FLAGS must match");
+
+int32_t StructTraits<mus::mojom::Event, EventUniquePtr>::action(
+    const EventUniquePtr& event) {
+  return static_cast<int32_t>(UIEventTypeToMojo(event->type()));
+}
+
+int32_t StructTraits<mus::mojom::Event, EventUniquePtr>::flags(
+    const EventUniquePtr& event) {
+  return event->flags();
+}
+
+int64_t StructTraits<mus::mojom::Event, EventUniquePtr>::time_stamp(
+    const EventUniquePtr& event) {
+  return event->time_stamp().ToInternalValue();
+}
+
+bool StructTraits<mus::mojom::Event, EventUniquePtr>::has_key_data(
+    const EventUniquePtr& event) {
+  return event->IsKeyEvent();
+}
+
+mus::mojom::KeyDataPtr
+StructTraits<mus::mojom::Event, EventUniquePtr>::key_data(
+    const EventUniquePtr& event) {
+  if (!event->IsKeyEvent())
+    return nullptr;
+
+  const ui::KeyEvent* key_event = event->AsKeyEvent();
+  mus::mojom::KeyDataPtr key_data(mus::mojom::KeyData::New());
+  key_data->key_code = key_event->GetConflatedWindowsKeyCode();
+  key_data->native_key_code =
+      ui::KeycodeConverter::DomCodeToNativeKeycode(key_event->code());
+  key_data->is_char = key_event->is_char();
+  key_data->character = key_event->GetCharacter();
+  key_data->windows_key_code = static_cast<mus::mojom::KeyboardCode>(
+      key_event->GetLocatedWindowsKeyboardCode());
+  key_data->text = key_event->GetText();
+  key_data->unmodified_text = key_event->GetUnmodifiedText();
+
+  return key_data;
+}
+
+bool StructTraits<mus::mojom::Event, EventUniquePtr>::has_pointer_data(
+    const EventUniquePtr& event) {
+  return event->IsPointerEvent() || event->IsMouseWheelEvent();
+}
+
+mus::mojom::PointerDataPtr
+StructTraits<mus::mojom::Event, EventUniquePtr>::pointer_data(
+    const EventUniquePtr& event) {
+  if (!event->IsPointerEvent() && !event->IsMouseWheelEvent())

[sadrul, 2016/06/06 17:10:59]

Use has_pointer_data()?

[Hadi, 2016/06/06 17:45:48]

Done.

+    return nullptr;
+
+  mus::mojom::PointerDataPtr pointer_data(mus::mojom::PointerData::New());
+
+  const ui::PointerDetails* pointer_details = nullptr;
+  if (event->IsPointerEvent()) {
+    const ui::PointerEvent* pointer_event = event->AsPointerEvent();
+    pointer_data->pointer_id = pointer_event->pointer_id();
+    pointer_details = &pointer_event->pointer_details();
+  } else {
+    const ui::MouseWheelEvent* wheel_event = event->AsMouseWheelEvent();
+    pointer_data->pointer_id = ui::PointerEvent::kMousePointerId;
+    pointer_details = &wheel_event->pointer_details();
+  }
+
+  switch (pointer_details->pointer_type) {
+    case ui::EventPointerType::POINTER_TYPE_MOUSE:
+      pointer_data->kind = mus::mojom::PointerKind::MOUSE;
+      break;
+    case ui::EventPointerType::POINTER_TYPE_TOUCH:
+      pointer_data->kind = mus::mojom::PointerKind::TOUCH;
+      break;
+    default:
+      NOTREACHED();
+  }
+
+  mus::mojom::BrushDataPtr brush_data(mus::mojom::BrushData::New());
+  // TODO(rjk): this is in the wrong coordinate system
+  brush_data->width = pointer_details->radius_x;
+  brush_data->height = pointer_details->radius_y;
+  // TODO(rjk): update for touch_event->rotation_angle();
+  brush_data->pressure = pointer_details->force;
+  brush_data->tilt_x = pointer_details->tilt_x;
+  brush_data->tilt_y = pointer_details->tilt_y;
+  pointer_data->brush_data = std::move(brush_data);
+
+  // TODO(rjkroege): Plumb raw pointer events on windows.
+  // TODO(rjkroege): Handle force-touch on MacOS
+  // TODO(rjkroege): Adjust brush data appropriately for Android.
+
+  mus::mojom::LocationDataPtr location_data(mus::mojom::LocationData::New());
+  const ui::LocatedEvent* located_event = event->AsLocatedEvent();
+  location_data->x = located_event->location_f().x();
+  location_data->y = located_event->location_f().y();
+  location_data->screen_x = located_event->root_location_f().x();
+  location_data->screen_y = located_event->root_location_f().y();
+  pointer_data->location = std::move(location_data);
+
+  if (event->IsMouseWheelEvent()) {
+    const ui::MouseWheelEvent* wheel_event = event->AsMouseWheelEvent();
+
+    mus::mojom::WheelDataPtr wheel_data(mus::mojom::WheelData::New());
+
+    // TODO(rjkroege): Support page scrolling on windows by directly
+    // cracking into a mojo event when the native event is available.
+    wheel_data->mode = mus::mojom::WheelMode::LINE;
+    // TODO(rjkroege): Support precise scrolling deltas.
+
+    if ((event->flags() & ui::EF_SHIFT_DOWN) != 0 &&
+        wheel_event->x_offset() == 0) {
+      wheel_data->delta_x = wheel_event->y_offset();
+      wheel_data->delta_y = 0;
+      wheel_data->delta_z = 0;
+    } else {
+      // TODO(rjkroege): support z in ui::Events.
+      wheel_data->delta_x = wheel_event->x_offset();
+      wheel_data->delta_y = wheel_event->y_offset();
+      wheel_data->delta_z = 0;
+    }
+    pointer_data->wheel_data = std::move(wheel_data);
+  }
+
+  return pointer_data;
+}
+
+bool StructTraits<mus::mojom::Event, EventUniquePtr>::Read(
+    mus::mojom::EventDataView event,
+    EventUniquePtr* out) {
+  switch (event.action()) {
+    case mus::mojom::EventType::KEY_PRESSED:
+    case mus::mojom::EventType::KEY_RELEASED: {
+      mus::mojom::KeyDataPtr key_data;
+      if (!event.ReadKeyData<mus::mojom::KeyDataPtr>(&key_data))
+        return false;
+
+      if (key_data->is_char) {
+        out->reset(new ui::KeyEvent(
+            static_cast<base::char16>(key_data->character),
+            static_cast<ui::KeyboardCode>(key_data->key_code), event.flags()));
+        return true;
+      } else {

[sadrul, 2016/06/06 17:10:59]

Don't need the else.

[Hadi, 2016/06/06 17:45:48]

Done.

+        out->reset(new ui::KeyEvent(
+            event.action() == mus::mojom::EventType::KEY_PRESSED
+                ? ui::ET_KEY_PRESSED
+                : ui::ET_KEY_RELEASED,
+
+            static_cast<ui::KeyboardCode>(key_data->key_code), event.flags()));
+        return true;
+      }
+    }
+    case mus::mojom::EventType::POINTER_DOWN:
+    case mus::mojom::EventType::POINTER_UP:
+    case mus::mojom::EventType::POINTER_MOVE:
+    case mus::mojom::EventType::POINTER_CANCEL:
+    case mus::mojom::EventType::MOUSE_EXIT:
+    case mus::mojom::EventType::WHEEL: {
+      mus::mojom::PointerDataPtr pointer_data;
+      if (!event.ReadPointerData<mus::mojom::PointerDataPtr>(&pointer_data))
+        return false;
+
+      const gfx::PointF location(pointer_data->location->x,
+                                 pointer_data->location->y);
+      const gfx::PointF screen_location(pointer_data->location->screen_x,
+                                        pointer_data->location->screen_y);
+
+      switch (pointer_data->kind) {
+        case mus::mojom::PointerKind::MOUSE: {
+          if (event.action() == mus::mojom::EventType::WHEEL) {
+            std::unique_ptr<ui::MouseEvent> pre_wheel_event(new ui::MouseEvent(

[sadrul, 2016/06/06 17:10:59]

Why do you need to create two events?

[Hadi, 2016/06/06 17:45:48]

Done.

+                ui::ET_MOUSEWHEEL, gfx::Point(), gfx::Point(),
+                ui::EventTimeForNow(), ui::EventFlags(event.flags()),
+                ui::EventFlags(event.flags())));
+            pre_wheel_event->set_location_f(location);
+            pre_wheel_event->set_root_location_f(screen_location);
+            out->reset(new ui::MouseWheelEvent(
+                *pre_wheel_event,
+                static_cast<int>(pointer_data->wheel_data->delta_x),
+                static_cast<int>(pointer_data->wheel_data->delta_y)));
+            return true;
+          } else {

[sadrul, 2016/06/06 17:10:59]

don't need the else.

[Hadi, 2016/06/06 17:45:48]

Done.

+            // TODO(moshayedi): Construct pointer event directly.
+            ui::PointerEvent* mouse_event = new ui::PointerEvent(ui::MouseEvent(
+                MojoMouseEventTypeToUIEvent(event.action(), event.flags()),
+                gfx::Point(), gfx::Point(), ui::EventTimeForNow(),

[sadrul, 2016/06/06 17:10:59]

send in |location| and |screen_location| here, instead of explicitly setting
them afterwards?

[Hadi, 2016/06/06 17:45:48]

Done.

+                ui::EventFlags(event.flags()), ui::EventFlags(event.flags())));
+            mouse_event->set_location_f(location);
+            mouse_event->set_root_location_f(screen_location);
+            out->reset(mouse_event);
+            return true;
+          }
+        }
+        case mus::mojom::PointerKind::TOUCH: {
+          // TODO(moshayedi): Construct pointer event directly.
+          ui::PointerEvent* touch_event = new ui::PointerEvent(ui::TouchEvent(

[sadrul, 2016/06/06 17:10:59]

s/touch_event/pointer_event/g

[Hadi, 2016/06/06 17:45:48]

Done.

+              MojoTouchEventTypeToUIEvent(event.action()), gfx::Point(),
+              ui::EventFlags(event.flags()), pointer_data->pointer_id,
+              base::TimeDelta::FromInternalValue(event.time_stamp()),
+              pointer_data->brush_data->width, pointer_data->brush_data->height,
+              0, pointer_data->brush_data->pressure));
+          touch_event->set_location_f(location);
+          touch_event->set_root_location_f(screen_location);
+          out->reset(touch_event);
+          return true;
+        }
+        case mus::mojom::PointerKind::PEN:
+          NOTIMPLEMENTED();
+          return false;
+      }
+    }
+    default:

[sadrul, 2016/06/06 17:10:59]

Do not have the default

[Hadi, 2016/06/06 17:45:48]

Done. Replaced it with "case UNKNOWN:" (the only remaining case) to make it more
explicit and less error-prone in future if we decide to add new event types.

+      NOTIMPLEMENTED();
+  }
+
+  return false;
+}
+
+}  // namespace mojo