1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_MOTION_EVENT_ANDROID_H_ 6 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_MOTION_EVENT_ANDROID_H_ 7 8 #include <jni.h> 9 10 #include "base/android/scoped_java_ref.h" 11 #include "base/memory/scoped_ptr.h" 12 #include "base/time/time.h" 13 #include "content/common/content_export.h" 14 #include "ui/events/gesture_detection/motion_event.h" 15 #include "ui/gfx/geometry/point_f.h" 16 17 namespace content { 18 19 // Implementation of ui::MotionEvent wrapping a native Android MotionEvent. 20 // All *input* coordinates are in device pixels (as with Android MotionEvent), 21 // while all *output* coordinates are in DIPs (as with WebTouchEvent). 22 class CONTENT_EXPORT MotionEventAndroid : public ui::MotionEvent { 23 public: 24 // Forcing the caller to provide all cached values upon construction 25 // eliminates the need to perform a JNI call to retrieve values individually. 26 MotionEventAndroid(float pix_to_dip, 27 JNIEnv* env, 28 jobject event, 29 jlong time_ms, 30 jint android_action, 31 jint pointer_count, 32 jint history_size, 33 jint action_index, 34 jfloat pos_x_0_pixels, 35 jfloat pos_y_0_pixels, 36 jfloat pos_x_1_pixels, 37 jfloat pos_y_1_pixels, 38 jint pointer_id_0, 39 jint pointer_id_1, 40 jfloat touch_major_0_pixels, 41 jfloat touch_major_1_pixels, 42 jfloat touch_minor_0_pixels, 43 jfloat touch_minor_1_pixels, 44 jfloat orientation_0_rad, 45 jfloat orientation_1_rad, 46 jfloat raw_pos_x_pixels, 47 jfloat raw_pos_y_pixels, 48 jint android_tool_type_0, 49 jint android_tool_type_1, 50 jint android_button_state, 51 jint meta_state); 52 virtual ~MotionEventAndroid(); 53 54 // ui::MotionEvent methods. 55 virtual int GetId() const OVERRIDE; 56 virtual Action GetAction() const OVERRIDE; 57 virtual int GetActionIndex() const OVERRIDE; 58 virtual size_t GetPointerCount() const OVERRIDE; 59 virtual int GetPointerId(size_t pointer_index) const OVERRIDE; 60 virtual float GetX(size_t pointer_index) const OVERRIDE; 61 virtual float GetY(size_t pointer_index) const OVERRIDE; 62 virtual float GetRawX(size_t pointer_index) const OVERRIDE; 63 virtual float GetRawY(size_t pointer_index) const OVERRIDE; 64 virtual float GetTouchMajor(size_t pointer_index) const OVERRIDE; 65 virtual float GetTouchMinor(size_t pointer_index) const OVERRIDE; 66 virtual float GetOrientation(size_t pointer_index) const OVERRIDE; 67 virtual float GetPressure(size_t pointer_index) const OVERRIDE; 68 virtual base::TimeTicks GetEventTime() const OVERRIDE; 69 virtual size_t GetHistorySize() const OVERRIDE; 70 virtual base::TimeTicks GetHistoricalEventTime( 71 size_t historical_index) const OVERRIDE; 72 virtual float GetHistoricalTouchMajor(size_t pointer_index, 73 size_t historical_index) const OVERRIDE; 74 virtual float GetHistoricalX(size_t pointer_index, 75 size_t historical_index) const OVERRIDE; 76 virtual float GetHistoricalY(size_t pointer_index, 77 size_t historical_index) const OVERRIDE; 78 virtual ToolType GetToolType(size_t pointer_index) const OVERRIDE; 79 virtual int GetButtonState() const OVERRIDE; 80 virtual int GetFlags() const OVERRIDE; 81 virtual scoped_ptr<MotionEvent> Clone() const OVERRIDE; 82 virtual scoped_ptr<MotionEvent> Cancel() const OVERRIDE; 83 84 // Additional Android MotionEvent methods. 85 base::TimeTicks GetDownTime() const; 86 87 static bool RegisterMotionEventAndroid(JNIEnv* env); 88 89 static base::android::ScopedJavaLocalRef<jobject> Obtain( 90 const MotionEventAndroid& event); 91 static base::android::ScopedJavaLocalRef<jobject> Obtain( 92 base::TimeTicks down_time, 93 base::TimeTicks event_time, 94 Action action, 95 float x_pixels, 96 float y_pixels); 97 98 private: 99 MotionEventAndroid(); 100 MotionEventAndroid(float pix_to_dip, JNIEnv* env, jobject event); 101 MotionEventAndroid(const MotionEventAndroid&); 102 MotionEventAndroid& operator=(const MotionEventAndroid&); 103 104 float ToDips(float pixels) const; 105 gfx::PointF ToDips(const gfx::PointF& pixels) const; 106 107 // Cache pointer coords, id's and major lengths for the most common 108 // touch-related scenarios, i.e., scrolling and pinching. This prevents 109 // redundant JNI fetches for the same bits. 110 enum { MAX_POINTERS_TO_CACHE = 2 }; 111 112 // The Java reference to the underlying MotionEvent. 113 base::android::ScopedJavaGlobalRef<jobject> event_; 114 115 base::TimeTicks cached_time_; 116 Action cached_action_; 117 size_t cached_pointer_count_; 118 size_t cached_history_size_; 119 int cached_action_index_; 120 gfx::PointF cached_positions_[MAX_POINTERS_TO_CACHE]; 121 int cached_pointer_ids_[MAX_POINTERS_TO_CACHE]; 122 float cached_touch_majors_[MAX_POINTERS_TO_CACHE]; 123 float cached_touch_minors_[MAX_POINTERS_TO_CACHE]; 124 float cached_orientations_[MAX_POINTERS_TO_CACHE]; 125 gfx::Vector2dF cached_raw_position_offset_; 126 ToolType cached_tool_types_[MAX_POINTERS_TO_CACHE]; 127 int cached_button_state_; 128 int cached_flags_; 129 130 // Used to convert pixel coordinates from the Java-backed MotionEvent to 131 // DIP coordinates cached/returned by the MotionEventAndroid. 132 const float pix_to_dip_; 133 134 // Whether |event_| should be recycled on destruction. This will only be true 135 // for those events generated via |Obtain(...)|. 136 bool should_recycle_; 137 }; 138 139 } // namespace content 140 141 #endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_MOTION_EVENT_ANDROID_H_ 142
