Enable FLAG_SLIPPERY window flag when swipe down on workspace

Bug: 131356741
Test: manual

Change-Id: Ibe0e3a03e7406d5d882a1c63265d6e4e0253983e

2 files changed, 51 insertions, 300 deletions

diff --git a/quickstep/src/com/android/launcher3/uioverrides/touchcontrollers/StatusBarTouchController.java b/quickstep/src/com/android/launcher3/uioverrides/touchcontrollers/StatusBarTouchController.java
index fee18204e..f5ba3725d 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/touchcontrollers/StatusBarTouchController.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/touchcontrollers/StatusBarTouchController.java
@@ -17,17 +17,22 @@ package com.android.launcher3.uioverrides.touchcontrollers;
 
 import static android.view.MotionEvent.ACTION_DOWN;
 import static android.view.MotionEvent.ACTION_MOVE;
+import static android.view.MotionEvent.ACTION_UP;
+import static android.view.MotionEvent.ACTION_CANCEL;
 
+import android.graphics.PointF;
 import android.os.RemoteException;
 import android.util.Log;
+import android.util.SparseArray;
 import android.view.MotionEvent;
 import android.view.ViewConfiguration;
+import android.view.Window;
+import android.view.WindowManager;
 
 import com.android.launcher3.AbstractFloatingView;
 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherState;
-import com.android.launcher3.touch.TouchEventTranslator;
 import com.android.launcher3.util.TouchController;
 import com.android.quickstep.RecentsModel;
 import com.android.systemui.shared.recents.ISystemUiProxy;
@@ -36,18 +41,29 @@ import java.io.PrintWriter;
 
 /**
  * TouchController for handling touch events that get sent to the StatusBar. Once the
- * Once the event delta y passes the touch slop, the events start getting forwarded.
+ * Once the event delta mDownY passes the touch slop, the events start getting forwarded.
  * All events are offset by initial Y value of the pointer.
  */
 public class StatusBarTouchController implements TouchController {
 
     private static final String TAG = "StatusBarController";
 
+    /**
+     * Window flag: Enable touches to slide out of a window into neighboring
+     * windows in mid-gesture instead of being captured for the duration of
+     * the gesture.
+     *
+     * This flag changes the behavior of touch focus for this window only.
+     * Touches can slide out of the window but they cannot necessarily slide
+     * back in (unless the other window with touch focus permits it).
+     */
+    private static final int FLAG_SLIPPERY = 0x20000000;
+
     protected final Launcher mLauncher;
-    protected final TouchEventTranslator mTranslator;
     private final float mTouchSlop;
     private ISystemUiProxy mSysUiProxy;
     private int mLastAction;
+    private final SparseArray<PointF> mDownEvents;
 
     /* If {@code false}, this controller should not handle the input {@link MotionEvent}.*/
     private boolean mCanIntercept;
@@ -56,7 +72,7 @@ public class StatusBarTouchController implements TouchController {
         mLauncher = l;
         // Guard against TAPs by increasing the touch slop.
         mTouchSlop = 2 * ViewConfiguration.get(l).getScaledTouchSlop();
-        mTranslator = new TouchEventTranslator((MotionEvent ev)-> dispatchTouchEvent(ev));
+        mDownEvents = new SparseArray<>();
     }
 
     @Override
@@ -64,7 +80,6 @@ public class StatusBarTouchController implements TouchController {
         writer.println(prefix + "mCanIntercept:" + mCanIntercept);
         writer.println(prefix + "mLastAction:" + MotionEvent.actionToString(mLastAction));
         writer.println(prefix + "mSysUiProxy available:" + (mSysUiProxy != null));
-
     }
 
     private void dispatchTouchEvent(MotionEvent ev) {
@@ -81,26 +96,31 @@ public class StatusBarTouchController implements TouchController {
     @Override
     public final boolean onControllerInterceptTouchEvent(MotionEvent ev) {
         int action = ev.getActionMasked();
+        int idx = ev.getActionIndex();
+        int pid = ev.getPointerId(idx);
         if (action == ACTION_DOWN) {
             mCanIntercept = canInterceptTouch(ev);
             if (!mCanIntercept) {
                 return false;
             }
-            mTranslator.reset();
-            mTranslator.setDownParameters(0, ev);
+            mDownEvents.put(pid, new PointF(ev.getX(), ev.getY()));
         } else if (ev.getActionMasked() == MotionEvent.ACTION_POINTER_DOWN) {
-            // Check!! should only set it only when threshold is not entered.
-            mTranslator.setDownParameters(ev.getActionIndex(), ev);
+           // Check!! should only set it only when threshold is not entered.
+           mDownEvents.put(pid, new PointF(ev.getX(idx), ev.getY(idx)));
         }
         if (!mCanIntercept) {
             return false;
         }
         if (action == ACTION_MOVE) {
-            float dy = ev.getY() - mTranslator.getDownY();
-            float dx = ev.getX() - mTranslator.getDownX();
-            if (dy > mTouchSlop && dy > Math.abs(dx)) {
-                mTranslator.dispatchDownEvents(ev);
-                mTranslator.processMotionEvent(ev);
+            float dy = ev.getY(idx) - mDownEvents.get(pid).y;
+            float dx = ev.getX(idx) - mDownEvents.get(pid).x;
+            // Currently input dispatcher will not do touch transfer if there are more than
+            // one touch pointer. Hence, even if slope passed, only set the slippery flag
+            // when there is single touch event. (context: InputDispatcher.cpp line 1445)
+            if (dy > mTouchSlop && dy > Math.abs(dx) && ev.getPointerCount() == 1) {
+                ev.setAction(ACTION_DOWN);
+                dispatchTouchEvent(ev);
+                setWindowSlippery(true);
                 return true;
             }
             if (Math.abs(dx) > mTouchSlop) {
@@ -110,13 +130,27 @@ public class StatusBarTouchController implements TouchController {
         return false;
     }
 
-
     @Override
     public final boolean onControllerTouchEvent(MotionEvent ev) {
-        mTranslator.processMotionEvent(ev);
+        if (ev.getAction() == ACTION_UP || ev.getAction() == ACTION_CANCEL) {
+            dispatchTouchEvent(ev);
+            setWindowSlippery(false);
+            return true;
+        }
         return true;
     }
 
+    private void setWindowSlippery(boolean enable) {
+        Window w = mLauncher.getWindow();
+        WindowManager.LayoutParams wlp = w.getAttributes();
+        if (enable) {
+            wlp.flags |= FLAG_SLIPPERY;
+        } else {
+            wlp.flags &= ~FLAG_SLIPPERY;
+        }
+        w.setAttributes(wlp);
+    }
+
     private boolean canInterceptTouch(MotionEvent ev) {
         if (!mLauncher.isInState(LauncherState.NORMAL) ||
                 AbstractFloatingView.getTopOpenViewWithType(mLauncher,
@@ -132,4 +166,4 @@ public class StatusBarTouchController implements TouchController {
         mSysUiProxy = RecentsModel.INSTANCE.get(mLauncher).getSystemUiProxy();
         return mSysUiProxy != null;
     }
-}
+}
\ No newline at end of file
diff --git a/src/com/android/launcher3/touch/TouchEventTranslator.java b/src/com/android/launcher3/touch/TouchEventTranslator.java
deleted file mode 100644
index 3fcda9084..000000000
--- a/src/com/android/launcher3/touch/TouchEventTranslator.java
+++ /dev/null
@@ -1,283 +0,0 @@
-/*
- * 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);
-    }
-}