| 1 | // Copyright 2013 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 | package org.chromium.content.browser; |
| 6 | |
| 7 | import android.animation.TimeAnimator; |
| 8 | import android.animation.TimeAnimator.TimeListener; |
| 9 | import android.os.Build; |
| 10 | import android.os.Handler; |
| 11 | import android.os.Looper; |
| 12 | import android.os.SystemClock; |
| 13 | import android.view.MotionEvent; |
| 14 | import android.view.MotionEvent.PointerProperties; |
| 15 | import android.view.MotionEvent.PointerCoords; |
| 16 | |
| 17 | import org.chromium.base.CalledByNative; |
| 18 | import org.chromium.base.JNINamespace; |
| 19 | |
| 20 | /** |
| 21 | * Provides a Java-side implementation for simulating touch gestures, |
| 22 | * such as scroll or pinch. |
| 23 | */ |
| 24 | @JNINamespace("content") |
| 25 | public class GenericTouchGesture { |
| 26 | private final ContentViewCore mContentViewCore; |
| 27 | |
| 28 | private final Handler mHandler = new Handler(Looper.getMainLooper()); |
| 29 | |
| 30 | private TimeAnimator mTimeAnimator; |
| 31 | |
| 32 | private int mNativePtr; |
| 33 | private long mDownTime; |
| 34 | |
| 35 | private final byte STATE_INITIAL = 0; |
| 36 | private final byte STATE_MOVING = 1; |
| 37 | private final byte STATE_PENDING_UP = 2; |
| 38 | private final byte STATE_FINAL = 3; |
| 39 | private byte state = STATE_INITIAL; |
| 40 | |
| 41 | private static class TouchPointer { |
| 42 | private final float mStartX; |
| 43 | private final float mStartY; |
| 44 | private final float mDeltaX; |
| 45 | private final float mDeltaY; |
| 46 | private final float mStepX; |
| 47 | private final float mStepY; |
| 48 | |
| 49 | private PointerProperties mProperties; |
| 50 | private PointerCoords mCoords; |
| 51 | |
| 52 | |
| 53 | // Class representing a single pointer being moved over the screen. |
| 54 | TouchPointer(int startX, int startY, int deltaX, int deltaY, |
| 55 | int id, float scale) { |
| 56 | mStartX = startX * scale; |
| 57 | mStartY = startY * scale; |
| 58 | |
| 59 | mDeltaX = deltaX * scale; |
| 60 | mDeltaY = deltaY * scale; |
| 61 | |
| 62 | if (deltaX != 0 || deltaY != 0) { |
| 63 | mStepX = mDeltaX / Math.abs(mDeltaX + mDeltaY); |
| 64 | mStepY = mDeltaY / Math.abs(mDeltaX + mDeltaY); |
| 65 | } else { |
| 66 | mStepX = 0; |
| 67 | mStepY = 0; |
| 68 | } |
| 69 | |
| 70 | mProperties = new PointerProperties(); |
| 71 | mProperties.id = id; |
| 72 | mProperties.toolType = MotionEvent.TOOL_TYPE_FINGER; |
| 73 | |
| 74 | mCoords = new PointerCoords(); |
| 75 | mCoords.x = mStartX; |
| 76 | mCoords.y = mStartY; |
| 77 | mCoords.pressure = 1.0f; |
| 78 | } |
| 79 | |
| 80 | PointerProperties getProperties() { |
| 81 | return mProperties; |
| 82 | } |
| 83 | |
| 84 | PointerCoords getCoords() { |
| 85 | return mCoords; |
| 86 | } |
| 87 | |
| 88 | float getCurrentX() { |
| 89 | return mCoords.x; |
| 90 | } |
| 91 | |
| 92 | float getCurrentY() { |
| 93 | return mCoords.y; |
| 94 | } |
| 95 | |
| 96 | void moveBy(float delta) { |
| 97 | mCoords.x += mStepX * delta; |
| 98 | mCoords.y += mStepY * delta; |
| 99 | } |
| 100 | |
| 101 | boolean hasArrived() { |
| 102 | return Math.abs(mCoords.x - mStartX) >= Math.abs(mDeltaX) && |
| 103 | Math.abs(mCoords.y - mStartY) >= Math.abs(mDeltaY); |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | private TouchPointer[] mPointers; |
| 108 | private final PointerProperties[] mPointerProperties; |
| 109 | private final PointerCoords[] mPointerCoords; |
| 110 | |
| 111 | |
| 112 | GenericTouchGesture(ContentViewCore contentViewCore, |
| 113 | int startX, int startY, int deltaX, int deltaY) { |
| 114 | mContentViewCore = contentViewCore; |
| 115 | |
| 116 | float scale = mContentViewCore.getRenderCoordinates().getDeviceScaleFactor(); |
| 117 | |
| 118 | mPointers = new TouchPointer[1]; |
| 119 | mPointers[0] = new TouchPointer(startX, startY, deltaX, deltaY, 0, scale); |
| 120 | |
| 121 | mPointerProperties = new PointerProperties[1]; |
| 122 | mPointerProperties[0] = mPointers[0].getProperties(); |
| 123 | |
| 124 | mPointerCoords = new PointerCoords[1]; |
| 125 | mPointerCoords[0] = mPointers[0].getCoords(); |
| 126 | } |
| 127 | |
| 128 | GenericTouchGesture(ContentViewCore contentViewCore, |
| 129 | int startX0, int startY0, int deltaX0, int deltaY0, |
| 130 | int startX1, int startY1, int deltaX1, int deltaY1) { |
| 131 | mContentViewCore = contentViewCore; |
| 132 | |
| 133 | float scale = mContentViewCore.getRenderCoordinates().getDeviceScaleFactor(); |
| 134 | |
| 135 | mPointers = new TouchPointer[2]; |
| 136 | mPointers[0] = new TouchPointer(startX0, startY0, deltaX0, deltaY0, 0, scale); |
| 137 | mPointers[1] = new TouchPointer(startX1, startY1, deltaX1, deltaY1, 1, scale); |
| 138 | |
| 139 | mPointerProperties = new PointerProperties[2]; |
| 140 | mPointerProperties[0] = mPointers[0].getProperties(); |
| 141 | mPointerProperties[1] = mPointers[1].getProperties(); |
| 142 | |
| 143 | mPointerCoords = new PointerCoords[2]; |
| 144 | mPointerCoords[0] = mPointers[0].getCoords(); |
| 145 | mPointerCoords[1] = mPointers[1].getCoords(); |
| 146 | } |
| 147 | |
| 148 | @CalledByNative |
| 149 | void start(int nativePtr) { |
| 150 | assert mNativePtr == 0; |
| 151 | mNativePtr = nativePtr; |
| 152 | |
| 153 | Runnable runnable = (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) ? |
| 154 | createJBRunnable() : createPreJBRunnable(); |
| 155 | mHandler.post(runnable); |
| 156 | } |
| 157 | |
| 158 | boolean sendEvent(long time) { |
| 159 | switch (state) { |
| 160 | case STATE_INITIAL: { |
| 161 | mDownTime = SystemClock.uptimeMillis(); |
| 162 | |
| 163 | // Touch the first pointer down. This initiates the gesture. |
| 164 | MotionEvent event = MotionEvent.obtain(mDownTime, time, |
| 165 | MotionEvent.ACTION_DOWN, |
| 166 | mPointers[0].getCurrentX(), mPointers[0].getCurrentY(), 0); |
| 167 | mContentViewCore.onTouchEvent(event); |
| 168 | event.recycle(); |
| 169 | |
| 170 | // If there are more pointers, touch them down too. |
| 171 | if (mPointers.length > 1) { |
| 172 | event = MotionEvent.obtain(mDownTime, time, |
| 173 | MotionEvent.ACTION_POINTER_DOWN, |
| 174 | mPointers.length, mPointerProperties, mPointerCoords, |
| 175 | 0, 0, 1, 1, 0, 0, 0, 0); |
| 176 | mContentViewCore.onTouchEvent(event); |
| 177 | event.recycle(); |
| 178 | } |
| 179 | state = STATE_MOVING; |
| 180 | break; |
| 181 | } |
| 182 | case STATE_MOVING: { |
| 183 | float delta = nativeGetDelta( |
| 184 | mNativePtr, mContentViewCore.getRenderCoordinates().getDeviceScaleFactor()); |
| 185 | if (delta != 0) { |
| 186 | for (TouchPointer pointer : mPointers) { |
| 187 | pointer.moveBy((float)delta); |
| 188 | } |
| 189 | MotionEvent event = MotionEvent.obtain(mDownTime, time, |
| 190 | MotionEvent.ACTION_MOVE, |
| 191 | mPointers.length, mPointerProperties, mPointerCoords, |
| 192 | 0, 0, 1, 1, 0, 0, 0, 0); |
| 193 | mContentViewCore.onTouchEvent(event); |
| 194 | event.recycle(); |
| 195 | } |
| 196 | if (havePointersArrived()) |
| 197 | state = STATE_PENDING_UP; |
| 198 | break; |
| 199 | } |
| 200 | case STATE_PENDING_UP: { |
| 201 | // If there are more than one pointers, lift them up first. |
| 202 | if (mPointers.length > 1) { |
| 203 | MotionEvent event = MotionEvent.obtain(mDownTime, time, |
| 204 | MotionEvent.ACTION_POINTER_UP, |
| 205 | mPointers.length, mPointerProperties, mPointerCoords, |
| 206 | 0, 0, 1, 1, 0, 0, 0, 0); |
| 207 | mContentViewCore.onTouchEvent(event); |
| 208 | event.recycle(); |
| 209 | } |
| 210 | |
| 211 | // Finally, lift the first pointer up to finish the gesture. |
| 212 | MotionEvent event = MotionEvent.obtain(mDownTime, time, |
| 213 | MotionEvent.ACTION_UP, |
| 214 | mPointers[0].getCurrentX(), mPointers[0].getCurrentY(), 0); |
| 215 | mContentViewCore.onTouchEvent(event); |
| 216 | event.recycle(); |
| 217 | |
| 218 | nativeSetHasFinished(mNativePtr); |
| 219 | state = STATE_FINAL; |
| 220 | break; |
| 221 | } |
| 222 | } |
| 223 | return state != STATE_FINAL; |
| 224 | } |
| 225 | |
| 226 | private boolean havePointersArrived() { |
| 227 | boolean arrived = true; |
| 228 | for (TouchPointer pointer : mPointers) { |
| 229 | arrived = arrived && pointer.hasArrived(); |
| 230 | } |
| 231 | return arrived; |
| 232 | } |
| 233 | |
| 234 | private Runnable createJBRunnable() { |
| 235 | // On JB, we rely on TimeAnimator to send events tied with vsync. |
| 236 | return new Runnable() { |
| 237 | @Override |
| 238 | public void run() { |
| 239 | mTimeAnimator = new TimeAnimator(); |
| 240 | mTimeAnimator.setTimeListener(new TimeListener() { |
| 241 | @Override |
| 242 | public void onTimeUpdate(TimeAnimator animation, long totalTime, |
| 243 | long deltaTime) { |
| 244 | if (!sendEvent(mDownTime + totalTime)) { |
| 245 | mTimeAnimator.end(); |
| 246 | } |
| 247 | } |
| 248 | }); |
| 249 | mTimeAnimator.start(); |
| 250 | } |
| 251 | }; |
| 252 | } |
| 253 | |
| 254 | private Runnable createPreJBRunnable() { |
| 255 | // Pre-JB there's no TimeAnimator, so we keep posting messages. |
| 256 | return new Runnable() { |
| 257 | @Override |
| 258 | public void run() { |
| 259 | if (sendEvent(SystemClock.uptimeMillis())) { |
| 260 | mHandler.post(this); |
| 261 | } |
| 262 | } |
| 263 | }; |
| 264 | } |
| 265 | |
| 266 | private native float nativeGetDelta( |
| 267 | int nativeGenericTouchGestureAndroid, float scale); |
| 268 | private native void nativeSetHasFinished(int nativeGenericTouchGestureAndroid); |
| 269 | } |