Merge "Allow medium-long-press to initiate drag-to-open menus" into lmp-dev

core/java/android/widget/ListPopupWindow.java

@@ -1186,15 +1186,27 @@ public class ListPopupWindow {
         /** Timeout before disallowing intercept on the source's parent. */
         private final int mTapTimeout;
 
+        /** Timeout before accepting a long-press to start forwarding. */
+        private final int mLongPressTimeout;
+
         /** Source view from which events are forwarded. */
         private final View mSrc;
 
         /** Runnable used to prevent conflicts with scrolling parents. */
         private Runnable mDisallowIntercept;
 
+        /** Runnable used to trigger forwarding on long-press. */
+        private Runnable mTriggerLongPress;
+
         /** Whether this listener is currently forwarding touch events. */
         private boolean mForwarding;
 
+        /**
+         * Whether forwarding was initiated by a long-press. If so, we won't
+         * force the window to dismiss when the touch stream ends.
+         */
+        private boolean mWasLongPress;
+
         /** The id of the first pointer down in the current event stream. */
         private int mActivePointerId;
 
@@ -1203,6 +1215,9 @@ public class ListPopupWindow {
             mScaledTouchSlop = ViewConfiguration.get(src.getContext()).getScaledTouchSlop();
             mTapTimeout = ViewConfiguration.getTapTimeout();
 
+            // Use a medium-press timeout. Halfway between tap and long-press.
+            mLongPressTimeout = (mTapTimeout + ViewConfiguration.getLongPressTimeout()) / 2;
+
             src.addOnAttachStateChangeListener(this);
         }
 
@@ -1223,7 +1238,14 @@ public class ListPopupWindow {
             final boolean wasForwarding = mForwarding;
             final boolean forwarding;
             if (wasForwarding) {
-                forwarding = onTouchForwarded(event) || !onForwardingStopped();
+                if (mWasLongPress) {
+                    // If we started forwarding as a result of a long-press,
+                    // just silently stop forwarding events so that the window
+                    // stays open.
+                    forwarding = onTouchForwarded(event);
+                } else {
+                    forwarding = onTouchForwarded(event) || !onForwardingStopped();
+                }
             } else {
                 forwarding = onTouchObserved(event) && onForwardingStarted();
 
@@ -1305,21 +1327,29 @@ public class ListPopupWindow {
             switch (actionMasked) {
                 case MotionEvent.ACTION_DOWN:
                     mActivePointerId = srcEvent.getPointerId(0);
+                    mWasLongPress = false;
+
                     if (mDisallowIntercept == null) {
                         mDisallowIntercept = new DisallowIntercept();
                     }
                     src.postDelayed(mDisallowIntercept, mTapTimeout);
+
+                    if (mTriggerLongPress == null) {
+                        mTriggerLongPress = new TriggerLongPress();
+                    }
+                    src.postDelayed(mTriggerLongPress, mLongPressTimeout);
                     break;
                 case MotionEvent.ACTION_MOVE:
                     final int activePointerIndex = srcEvent.findPointerIndex(mActivePointerId);
                     if (activePointerIndex >= 0) {
                         final float x = srcEvent.getX(activePointerIndex);
                         final float y = srcEvent.getY(activePointerIndex);
+
+                        // Has the pointer has moved outside of the view?
                         if (!src.pointInView(x, y, mScaledTouchSlop)) {
-                            // The pointer has moved outside of the view.
-                            if (mDisallowIntercept != null) {
-                                src.removeCallbacks(mDisallowIntercept);
-                            }
+                            clearCallbacks();
+
+                            // Don't let the parent intercept our events.
                             src.getParent().requestDisallowInterceptTouchEvent(true);
                             return true;
                         }
@@ -1327,15 +1357,48 @@ public class ListPopupWindow {
                     break;
                 case MotionEvent.ACTION_CANCEL:
                 case MotionEvent.ACTION_UP:
-                    if (mDisallowIntercept != null) {
-                        src.removeCallbacks(mDisallowIntercept);
-                    }
+                    clearCallbacks();
                     break;
             }
 
             return false;
         }
 
+        private void clearCallbacks() {
+            if (mTriggerLongPress != null) {
+                mSrc.removeCallbacks(mTriggerLongPress);
+            }
+
+            if (mDisallowIntercept != null) {
+                mSrc.removeCallbacks(mDisallowIntercept);
+            }
+        }
+
+        private void onLongPress() {
+            clearCallbacks();
+
+            final View src = mSrc;
+            if (!src.isEnabled()) {
+                return;
+            }
+
+            if (!onForwardingStarted()) {
+                return;
+            }
+
+            // Don't let the parent intercept our events.
+            mSrc.getParent().requestDisallowInterceptTouchEvent(true);
+
+            // Make sure we cancel any ongoing source event stream.
+            final long now = SystemClock.uptimeMillis();
+            final MotionEvent e = MotionEvent.obtain(now, now, MotionEvent.ACTION_CANCEL, 0, 0, 0);
+            mSrc.onTouchEvent(e);
+            e.recycle();
+
+            mForwarding = true;
+            mWasLongPress = true;
+        }
+
         /**
          * Handled forwarded motion events and determines when to stop
          * forwarding.
@@ -1379,6 +1442,13 @@ public class ListPopupWindow {
                 parent.requestDisallowInterceptTouchEvent(true);
             }
         }
+
+        private class TriggerLongPress implements Runnable {
+            @Override
+            public void run() {
+                onLongPress();
+            }
+        }
     }
 
     /**