blimp: Add support for input handling

content/browser/renderer_host/input/motion_event_android.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 CONTENT_BROWSER_RENDERER_HOST_INPUT_MOTION_EVENT_ANDROID_H_
-#define CONTENT_BROWSER_RENDERER_HOST_INPUT_MOTION_EVENT_ANDROID_H_
-
-#include <jni.h>
-
-#include "base/android/scoped_java_ref.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/time/time.h"
-#include "content/common/content_export.h"
-#include "ui/events/gesture_detection/motion_event.h"
-#include "ui/gfx/geometry/point_f.h"
-
-namespace content {
-
-// Implementation of ui::MotionEvent wrapping a native Android MotionEvent.
-// All *input* coordinates are in device pixels (as with Android MotionEvent),
-// while all *output* coordinates are in DIPs (as with WebTouchEvent).
-class CONTENT_EXPORT MotionEventAndroid : public ui::MotionEvent {
- public:
-  struct Pointer {
-    Pointer(jint id,
-            jfloat pos_x_pixels,
-            jfloat pos_y_pixels,
-            jfloat touch_major_pixels,
-            jfloat touch_minor_pixels,
-            jfloat orientation_rad,
-            jint tool_type);
-    jint id;
-    jfloat pos_x_pixels;
-    jfloat pos_y_pixels;
-    jfloat touch_major_pixels;
-    jfloat touch_minor_pixels;
-    jfloat orientation_rad;
-    jint tool_type;
-  };
-
-  // Forcing the caller to provide all cached values upon construction
-  // eliminates the need to perform a JNI call to retrieve values individually.
-  MotionEventAndroid(float pix_to_dip,
-                     JNIEnv* env,
-                     jobject event,
-                     jlong time_ms,
-                     jint android_action,
-                     jint pointer_count,
-                     jint history_size,
-                     jint action_index,
-                     jint android_button_state,
-                     jint meta_state,
-                     jfloat raw_offset_x_pixels,
-                     jfloat raw_offset_y_pixels,
-                     const Pointer& pointer0,
-                     const Pointer& pointer1);
-  ~MotionEventAndroid() override;
-
-  // ui::MotionEvent methods.
-  uint32 GetUniqueEventId() const override;
-  Action GetAction() const override;
-  int GetActionIndex() const override;
-  size_t GetPointerCount() const override;
-  int GetPointerId(size_t pointer_index) const override;
-  float GetX(size_t pointer_index) const override;
-  float GetY(size_t pointer_index) const override;
-  float GetRawX(size_t pointer_index) const override;
-  float GetRawY(size_t pointer_index) const override;
-  float GetTouchMajor(size_t pointer_index) const override;
-  float GetTouchMinor(size_t pointer_index) const override;
-  float GetOrientation(size_t pointer_index) const override;
-  float GetPressure(size_t pointer_index) const override;
-  base::TimeTicks GetEventTime() const override;
-  size_t GetHistorySize() const override;
-  base::TimeTicks GetHistoricalEventTime(
-      size_t historical_index) const override;
-  float GetHistoricalTouchMajor(size_t pointer_index,
-                                size_t historical_index) const override;
-  float GetHistoricalX(size_t pointer_index,
-                       size_t historical_index) const override;
-  float GetHistoricalY(size_t pointer_index,
-                       size_t historical_index) const override;
-  ToolType GetToolType(size_t pointer_index) const override;
-  int GetButtonState() const override;
-  int GetFlags() const override;
-
-  static bool RegisterMotionEventAndroid(JNIEnv* env);
-
- private:
-  struct CachedPointer;
-
-  float ToDips(float pixels) const;
-  CachedPointer FromAndroidPointer(const Pointer& pointer) const;
-
-  // Cache pointer coords, id's and major lengths for the most common
-  // touch-related scenarios, i.e., scrolling and pinching.  This prevents
-  // redundant JNI fetches for the same bits.
-  enum { MAX_POINTERS_TO_CACHE = 2 };
-
-  // The Java reference to the underlying MotionEvent.
-  base::android::ScopedJavaGlobalRef<jobject> event_;
-
-  // Used to convert pixel coordinates from the Java-backed MotionEvent to
-  // DIP coordinates cached/returned by the MotionEventAndroid.
-  const float pix_to_dip_;
-
-  const base::TimeTicks cached_time_;
-  const Action cached_action_;
-  const size_t cached_pointer_count_;
-  const size_t cached_history_size_;
-  const int cached_action_index_;
-  const int cached_button_state_;
-  const int cached_flags_;
-  const gfx::Vector2dF cached_raw_position_offset_;
-  struct CachedPointer {
-    CachedPointer();
-    int id;
-    gfx::PointF position;
-    float touch_major;
-    float touch_minor;
-    float orientation;
-    ToolType tool_type;
-  } cached_pointers_[MAX_POINTERS_TO_CACHE];
-
-  // A unique identifier for the Android motion event.
-  const uint32 unique_event_id_;
-
-  DISALLOW_COPY_AND_ASSIGN(MotionEventAndroid);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_MOTION_EVENT_ANDROID_H_