mus: Add EventObserver to allow passively listening to UI events

components/mus/ws/accelerator.cc

 // 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 "components/mus/ws/accelerator.h"
 
-#include "mojo/converters/geometry/geometry_type_converters.h"
-#include "mojo/converters/input_events/input_events_type_converters.h"
-
 namespace mus {
 namespace ws {
 
 Accelerator::Accelerator(uint32_t id, const mojom::EventMatcher& matcher)
     : id_(id),
-      fields_to_match_(NONE),
       accelerator_phase_(matcher.accelerator_phase),
-      event_type_(ui::ET_UNKNOWN),
-      event_flags_(ui::EF_NONE),
-      ignore_event_flags_(ui::EF_NONE),
-      keyboard_code_(ui::VKEY_UNKNOWN),
-      pointer_type_(ui::EventPointerType::POINTER_TYPE_UNKNOWN),
-      weak_factory_(this) {
-  if (matcher.type_matcher) {
-    fields_to_match_ |= TYPE;
-    switch (matcher.type_matcher->type) {
-      case mus::mojom::EventType::POINTER_DOWN:
-        event_type_ = ui::ET_POINTER_DOWN;
-        break;
-      case mus::mojom::EventType::POINTER_MOVE:
-        event_type_ = ui::ET_POINTER_MOVED;
-        break;
-      case mus::mojom::EventType::MOUSE_EXIT:
-        event_type_ = ui::ET_POINTER_EXITED;
-        break;
-      case mus::mojom::EventType::POINTER_UP:
-        event_type_ = ui::ET_POINTER_UP;
-        break;
-      case mus::mojom::EventType::POINTER_CANCEL:
-        event_type_ = ui::ET_POINTER_CANCELLED;
-        break;
-      case mus::mojom::EventType::KEY_PRESSED:
-        event_type_ = ui::ET_KEY_PRESSED;
-        break;
-      case mus::mojom::EventType::KEY_RELEASED:
-        event_type_ = ui::ET_KEY_RELEASED;
-        break;
-      default:
-        NOTREACHED();
-    }
-  }
-  if (matcher.flags_matcher) {
-    fields_to_match_ |= FLAGS;
-    event_flags_ = matcher.flags_matcher->flags;
-    if (matcher.ignore_flags_matcher)
-      ignore_event_flags_ = matcher.ignore_flags_matcher->flags;
-  }
-  if (matcher.key_matcher) {
-    fields_to_match_ |= KEYBOARD_CODE;
-    keyboard_code_ = static_cast<uint16_t>(matcher.key_matcher->keyboard_code);
-  }
-  if (matcher.pointer_kind_matcher) {
-    fields_to_match_ |= POINTER_KIND;
-    switch (matcher.pointer_kind_matcher->pointer_kind) {
-      case mojom::PointerKind::MOUSE:
-        pointer_type_ = ui::EventPointerType::POINTER_TYPE_MOUSE;
-        break;
-      case mojom::PointerKind::TOUCH:
-        pointer_type_ = ui::EventPointerType::POINTER_TYPE_TOUCH;
-        break;
-      default:
-        NOTREACHED();
-    }
-  }
-  if (matcher.pointer_location_matcher) {
-    fields_to_match_ |= POINTER_LOCATION;
-    pointer_region_ = matcher.pointer_location_matcher->region.To<gfx::RectF>();
-  }
-}
+      event_matcher_(matcher),
+      weak_factory_(this) {}
 
 Accelerator::~Accelerator() {}
 
 bool Accelerator::MatchesEvent(const ui::Event& event,
                                const mojom::AcceleratorPhase phase) const {
   if (accelerator_phase_ != phase)
     return false;
-  if ((fields_to_match_ & TYPE) && event.type() != event_type_)
+  if (!event_matcher_.MatchesEvent(event))
     return false;
-  int flags = event.flags() & ~ignore_event_flags_;
-  if ((fields_to_match_ & FLAGS) && flags != event_flags_)
-    return false;
-  if (fields_to_match_ & KEYBOARD_CODE) {
-    if (!event.IsKeyEvent())
-      return false;
-    if (keyboard_code_ != event.AsKeyEvent()->GetConflatedWindowsKeyCode())
-      return false;
-  }
-  if (fields_to_match_ & POINTER_KIND) {
-    if (!event.IsPointerEvent() ||
-        pointer_type_ != event.AsPointerEvent()->pointer_details().pointer_type)
-      return false;
-  }
-  if (fields_to_match_ & POINTER_LOCATION) {
-    // TODO(sad): The tricky part here is to make sure the same coord-space is
-    // used for the location-region and the event-location.
-    NOTIMPLEMENTED();
-    return false;
-  }
-
   return true;
 }
 
 bool Accelerator::EqualEventMatcher(const Accelerator* other) const {
-  return fields_to_match_ == other->fields_to_match_ &&
-         accelerator_phase_ == other->accelerator_phase_ &&
-         event_type_ == other->event_type_ &&
-         event_flags_ == other->event_flags_ &&
-         ignore_event_flags_ == other->ignore_event_flags_ &&
-         keyboard_code_ == other->keyboard_code_ &&
-         pointer_type_ == other->pointer_type_ &&
-         pointer_region_ == other->pointer_region_;
+  return accelerator_phase_ == other->accelerator_phase_ &&
+         event_matcher_.Equals(other->event_matcher_);
 }
 
 }  // namespace ws
 }  // namespace mus