Revert "Enable FLAG_SLIPPERY window flag when swipe down on workspace"

This reverts commit 35062f8ed32ea4a868be077fdae37409a700e759.

Reason for revert: Moving to R1

Change-Id: Ifd19d78015a66c9fbe9a67845232d13e011943d3

1 files changed, 283 insertions, 0 deletions

diff --git a/src/com/android/launcher3/touch/TouchEventTranslator.java b/src/com/android/launcher3/touch/TouchEventTranslator.java
new file mode 100644
index 000000000..3fcda9084
--- /dev/null
+++ b/src/com/android/launcher3/touch/TouchEventTranslator.java
@@ -0,0 +1,283 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+package com.android.launcher3.touch;
+
+import android.graphics.PointF;
+import android.util.Log;
+import android.util.Pair;
+import android.util.SparseArray;
+import android.view.MotionEvent;
+import android.view.MotionEvent.PointerCoords;
+import android.view.MotionEvent.PointerProperties;
+
+import java.util.function.Consumer;
+
+/**
+ * To minimize the size of the MotionEvent, historic events are not copied and passed via the
+ * listener.
+ */
+public class TouchEventTranslator {
+
+    private static final String TAG = "TouchEventTranslator";
+    private static final boolean DEBUG = false;
+
+    private class DownState {
+        long timeStamp;
+        float downX;
+        float downY;
+        public DownState(long timeStamp, float downX, float downY) {
+            this.timeStamp = timeStamp;
+            this.downX = downX;
+            this.downY = downY;
+        }
+    };
+    private final DownState ZERO = new DownState(0, 0f, 0f);
+
+    private final Consumer<MotionEvent> mListener;
+
+    private final SparseArray<DownState> mDownEvents;
+    private final SparseArray<PointF> mFingers;
+
+    private final SparseArray<Pair<PointerProperties[], PointerCoords[]>> mCache;
+
+    public TouchEventTranslator(Consumer<MotionEvent> listener) {
+        mDownEvents = new SparseArray<>();
+        mFingers = new SparseArray<>();
+        mCache = new SparseArray<>();
+
+        mListener = listener;
+    }
+
+    public void reset() {
+        mDownEvents.clear();
+        mFingers.clear();
+    }
+
+    public float getDownX() {
+        return mDownEvents.get(0).downX;
+    }
+
+    public float getDownY() {
+        return mDownEvents.get(0).downY;
+    }
+
+    public void setDownParameters(int idx, MotionEvent e) {
+        DownState ev = new DownState(e.getEventTime(), e.getX(idx), e.getY(idx));
+        mDownEvents.append(idx, ev);
+    }
+
+    public void dispatchDownEvents(MotionEvent ev) {
+        for(int i = 0; i < ev.getPointerCount() && i < mDownEvents.size(); i++) {
+            int pid = ev.getPointerId(i);
+            put(pid, i, ev.getX(i), 0, mDownEvents.get(i).timeStamp, ev);
+        }
+    }
+
+    public void processMotionEvent(MotionEvent ev) {
+        if (DEBUG) {
+            printSamples(TAG + " processMotionEvent", ev);
+        }
+        int index = ev.getActionIndex();
+        float x = ev.getX(index);
+        float y = ev.getY(index) - mDownEvents.get(index, ZERO).downY;
+        switch (ev.getActionMasked()) {
+            case MotionEvent.ACTION_POINTER_DOWN:
+                int pid = ev.getPointerId(index);
+                if(mFingers.get(pid, null) != null) {
+                    for(int i=0; i < ev.getPointerCount(); i++) {
+                        pid = ev.getPointerId(i);
+                        position(pid, x, y);
+                    }
+                    generateEvent(ev.getAction(), ev);
+                } else {
+                    put(pid, index, x, y, ev);
+                }
+                break;
+            case MotionEvent.ACTION_MOVE:
+                for(int i=0; i < ev.getPointerCount(); i++) {
+                    pid = ev.getPointerId(i);
+                    position(pid, x, y);
+                }
+                generateEvent(ev.getAction(), ev);
+                break;
+            case MotionEvent.ACTION_POINTER_UP:
+            case MotionEvent.ACTION_UP:
+                pid = ev.getPointerId(index);
+                lift(pid, index, x, y, ev);
+                break;
+            case MotionEvent.ACTION_CANCEL:
+                cancel(ev);
+                break;
+            default:
+                Log.v(TAG, "Didn't process ");
+                printSamples(TAG, ev);
+
+        }
+    }
+
+    private TouchEventTranslator put(int id, int index, float x, float y, MotionEvent ev) {
+        return put(id, index, x, y, ev.getEventTime(), ev);
+    }
+
+    private TouchEventTranslator put(int id, int index, float x, float y, long ms, MotionEvent ev) {
+        checkFingerExistence(id, false);
+        boolean isInitialDown = (mFingers.size() == 0);
+
+        mFingers.put(id, new PointF(x, y));
+        int n = mFingers.size();
+
+        if (mCache.get(n) == null) {
+            PointerProperties[] properties = new PointerProperties[n];
+            PointerCoords[] coords = new PointerCoords[n];
+            for (int i = 0; i < n; i++) {
+                properties[i] = new PointerProperties();
+                coords[i] = new PointerCoords();
+            }
+            mCache.put(n, new Pair(properties, coords));
+        }
+
+        int action;
+        if (isInitialDown) {
+            action = MotionEvent.ACTION_DOWN;
+        } else {
+            action = MotionEvent.ACTION_POINTER_DOWN;
+            // Set the id of the changed pointer.
+            action |= index << MotionEvent.ACTION_POINTER_INDEX_SHIFT;
+        }
+        generateEvent(action, ms, ev);
+        return this;
+    }
+
+    public TouchEventTranslator position(int id, float x, float y) {
+        checkFingerExistence(id, true);
+        mFingers.get(id).set(x, y);
+        return this;
+    }
+
+    private TouchEventTranslator lift(int id, int index, MotionEvent ev) {
+        checkFingerExistence(id, true);
+        boolean isFinalUp = (mFingers.size() == 1);
+        int action;
+        if (isFinalUp) {
+            action = MotionEvent.ACTION_UP;
+        } else {
+            action = MotionEvent.ACTION_POINTER_UP;
+            // Set the id of the changed pointer.
+            action |= index << MotionEvent.ACTION_POINTER_INDEX_SHIFT;
+        }
+        generateEvent(action, ev);
+        mFingers.remove(id);
+        return this;
+    }
+
+    private TouchEventTranslator lift(int id, int index, float x, float y, MotionEvent ev) {
+        checkFingerExistence(id, true);
+        mFingers.get(id).set(x, y);
+        return lift(id, index, ev);
+    }
+
+    public TouchEventTranslator cancel(MotionEvent ev) {
+        generateEvent(MotionEvent.ACTION_CANCEL, ev);
+        mFingers.clear();
+        return this;
+    }
+
+    private void checkFingerExistence(int id, boolean shouldExist) {
+        if (shouldExist != (mFingers.get(id, null) != null)) {
+            throw new IllegalArgumentException(
+                    shouldExist ? "Finger does not exist" : "Finger already exists");
+        }
+    }
+
+
+    /**
+     * Used to debug MotionEvents being sent/received.
+     */
+    public void printSamples(String msg, MotionEvent ev) {
+        System.out.printf("%s %s", msg, MotionEvent.actionToString(ev.getActionMasked()));
+        final int pointerCount = ev.getPointerCount();
+        System.out.printf("#%d/%d", ev.getActionIndex(), pointerCount);
+        System.out.printf(" t=%d:", ev.getEventTime());
+        for (int p = 0; p < pointerCount; p++) {
+            System.out.printf("  id=%d: (%f,%f)",
+                    ev.getPointerId(p), ev.getX(p), ev.getY(p));
+        }
+        System.out.println();
+    }
+
+    private void generateEvent(int action, MotionEvent ev) {
+        generateEvent(action, ev.getEventTime(), ev);
+    }
+
+    private void generateEvent(int action, long ms, MotionEvent ev) {
+        Pair<PointerProperties[], PointerCoords[]> state = getFingerState();
+        MotionEvent event = MotionEvent.obtain(
+                mDownEvents.get(0).timeStamp,
+                ms,
+                action,
+                state.first.length,
+                state.first,
+                state.second,
+                ev.getMetaState(),
+                ev.getButtonState() /* buttonState */,
+                ev.getXPrecision() /* xPrecision */,
+                ev.getYPrecision() /* yPrecision */,
+                ev.getDeviceId(),
+                ev.getEdgeFlags(),
+                ev.getSource(),
+                ev.getFlags() /* flags */);
+        if (DEBUG) {
+            printSamples(TAG + " generateEvent", event);
+        }
+        if (event.getPointerId(event.getActionIndex()) < 0) {
+            printSamples(TAG + "generateEvent", event);
+            throw new IllegalStateException(event.getActionIndex() + " not found in MotionEvent");
+        }
+        mListener.accept(event);
+        event.recycle();
+    }
+
+    /**
+     * Returns the description of the fingers' state expected by MotionEvent.
+     */
+    private Pair<PointerProperties[], PointerCoords[]> getFingerState() {
+        int nFingers = mFingers.size();
+
+        Pair<PointerProperties[], PointerCoords[]> result = mCache.get(nFingers);
+        PointerProperties[] properties = result.first;
+        PointerCoords[] coordinates = result.second;
+
+        int index = 0;
+        for (int i = 0; i < mFingers.size(); i++) {
+            int id = mFingers.keyAt(i);
+            PointF location = mFingers.get(id);
+
+            PointerProperties property = properties[i];
+            property.id = id;
+            property.toolType = MotionEvent.TOOL_TYPE_FINGER;
+            properties[index] = property;
+
+            PointerCoords coordinate = coordinates[i];
+            coordinate.x = location.x;
+            coordinate.y = location.y;
+            coordinate.pressure = 1.0f;
+            coordinates[index] = coordinate;
+
+            index++;
+        }
+        return mCache.get(nFingers);
+    }
+}