Android Build Tools

Android/android-ndk-r27d/sources/android/ndk_helper/gestureDetector.h

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+/*
+ * Copyright 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <vector>
+
+#include <android/sensor.h>
+#include <android/log.h>
+#include <android_native_app_glue.h>
+#include <android/native_window_jni.h>
+#include "JNIHelper.h"
+#include "vecmath.h"
+
+namespace ndk_helper
+{
+//--------------------------------------------------------------------------------
+// Constants
+//--------------------------------------------------------------------------------
+const int32_t DOUBLE_TAP_TIMEOUT = 300 * 1000000;
+const int32_t TAP_TIMEOUT = 180 * 1000000;
+const int32_t DOUBLE_TAP_SLOP = 100;
+const int32_t TOUCH_SLOP = 8;
+
+enum
+{
+    GESTURE_STATE_NONE = 0,
+    GESTURE_STATE_START = 1,
+    GESTURE_STATE_MOVE = 2,
+    GESTURE_STATE_END = 4,
+    GESTURE_STATE_ACTION = (GESTURE_STATE_START | GESTURE_STATE_END),
+};
+typedef int32_t GESTURE_STATE;
+
+/******************************************************************
+ * Base class of Gesture Detectors
+ * GestureDetectors handles input events and detect gestures
+ * Note that different detectors may detect gestures with an event at
+ * same time. The caller needs to manage gesture priority accordingly
+ *
+ */
+class GestureDetector
+{
+protected:
+    float dp_factor_;
+public:
+    GestureDetector();
+    virtual ~GestureDetector()
+    {
+    }
+    virtual void SetConfiguration( AConfiguration* config );
+
+    virtual GESTURE_STATE Detect( const AInputEvent* motion_event ) = 0;
+};
+
+/******************************************************************
+ * Tap gesture detector
+ * Returns GESTURE_STATE_ACTION when a tap gesture is detected
+ *
+ */
+class TapDetector: public GestureDetector
+{
+private:
+    int32_t down_pointer_id_;
+    float down_x_;
+    float down_y_;
+public:
+    TapDetector()
+    {
+    }
+    virtual ~TapDetector()
+    {
+    }
+    virtual GESTURE_STATE Detect( const AInputEvent* motion_event );
+};
+
+/******************************************************************
+ * Pinch gesture detector
+ * Returns GESTURE_STATE_ACTION when a double-tap gesture is detected
+ *
+ */
+class DoubletapDetector: public GestureDetector
+{
+private:
+    TapDetector tap_detector_;
+    int64_t last_tap_time_;
+    float last_tap_x_;
+    float last_tap_y_;
+
+public:
+    DoubletapDetector()
+    {
+    }
+    virtual ~DoubletapDetector()
+    {
+    }
+    virtual GESTURE_STATE Detect( const AInputEvent* motion_event );
+    virtual void SetConfiguration( AConfiguration* config );
+};
+
+/******************************************************************
+ * Double gesture detector
+ * Returns pinch gesture state when a pinch gesture is detected
+ * The class handles multiple touches more than 2
+ * When the finger 1,2,3 are tapped and then finger 1 is released,
+ * the detector start new pinch gesture with finger 2 & 3.
+ */
+class PinchDetector: public GestureDetector
+{
+private:
+    int32_t FindIndex( const AInputEvent* event, int32_t id );
+    const AInputEvent* event_;
+    std::vector<int32_t> vec_pointers_;
+
+public:
+    PinchDetector()
+    {
+    }
+    virtual ~PinchDetector()
+    {
+    }
+    virtual GESTURE_STATE Detect( const AInputEvent* event );
+    bool GetPointers( Vec2& v1, Vec2& v2 );
+};
+
+/******************************************************************
+ * Drag gesture detector
+ * Returns drag gesture state when a drag-tap gesture is detected
+ *
+ */
+class DragDetector: public GestureDetector
+{
+private:
+    int32_t FindIndex( const AInputEvent* event, int32_t id );
+    const AInputEvent* event_;
+    std::vector<int32_t> vec_pointers_;
+public:
+    DragDetector()
+    {
+    }
+    virtual ~DragDetector()
+    {
+    }
+    virtual GESTURE_STATE Detect( const AInputEvent* event );
+    bool GetPointer( Vec2& v );
+};
+
+}   //namespace ndkHelper