Unified Gesture Recognizer

ui/events/gesture_detection/ui_gesture_provider.h

+// Copyright 2014 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.
+
+#ifndef UI_EVENTS_GESTURE_DETECTION_UI_GESTURE_PROVIDER_H_
+#define UI_EVENTS_GESTURE_DETECTION_UI_GESTURE_PROVIDER_H_
+
+#include "base/basictypes.h"
+#include "ui/events/event.h"
+#include "ui/events/events_export.h"
+#include "ui/events/gesture_detection/filtered_gesture_provider.h"
+#include "ui/events/gesture_detection/gesture_event_data_packet.h"
+#include "ui/events/gesture_detection/motion_event_ui.h"
+#include "ui/events/gesture_detection/touch_disposition_gesture_filter.h"
+
+namespace ui {
+
+class EVENTS_EXPORT UIGestureProviderClient {
+ public:
+  virtual ~UIGestureProviderClient() {}
+  virtual void OnGestureEvent(GestureEvent* event) = 0;

[jdduke (slow), 2014/05/02 17:56:43]

scoped_ptr?

[tdresser, 2014/05/05 15:42:35]

Yeah, that probably is clearer.
I've let the GestureRecognizerImpl dispose of these events for now - in the aura
GR, GestureSequence disposes of events which are dispatched in this way.

Does this seem reasonable?

+};
+
+// Provides gesture detection and dispatch given a sequence of touch events
+// and touch event acks.
+class EVENTS_EXPORT UIGestureProvider : public FilteredGestureProvider {

[jdduke (slow), 2014/05/02 17:56:43]

GestureProviderAura? 

[tdresser, 2014/05/05 15:42:35]

Done.

+ public:

[jdduke (slow), 2014/05/02 17:56:43]

Hmm, can we compose FilteredGestureProvider and instead implement
ui::GestureProviderClient directly? Passing this to the member filtered
provider? Then we don't need the GestureProviderClientConverter, we can just do
the conversion directly.

[tdresser, 2014/05/05 15:42:35]

Much, much better. Thanks for catching that!
Done.

+  bool OnTouchEvent(const TouchEvent& event);
+  static UIGestureProvider* Create(UIGestureProviderClient* client);
+  virtual ~UIGestureProvider();
+  const MotionEventUI& get_pointer_state() { return motion_event_; }
+
+ private:
+  class GestureProviderClientConverter : public ui::GestureProviderClient {
+   public:
+    GestureProviderClientConverter(UIGestureProviderClient* client)
+        : client_(client), flags_(0) {}
+
+    virtual ~GestureProviderClientConverter() {}
+
+    virtual void OnGestureEvent(const GestureEventData& gesture) OVERRIDE;
+    void set_flags(int flags) { flags_ = flags; }
+
+   private:
+    UIGestureProviderClient* client_;
+    int flags_;
+
+    DISALLOW_COPY_AND_ASSIGN(GestureProviderClientConverter);
+  };
+
+  UIGestureProvider(scoped_ptr<GestureProviderClientConverter> converter);
+  scoped_ptr<GestureProviderClientConverter> converter_;
+  MotionEventUI motion_event_;
+
+  DISALLOW_COPY_AND_ASSIGN(UIGestureProvider);
+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_GESTURE_DETECTION_UI_GESTURE_PROVIDER_H_