This enables to slide up All Apps from anywhere in the workspace,

not only over the hotseat.

The tricky part handling with scrollable widgets is solved by
setting requestDisallowInterceptTouchEvent from within the
widget view host (and resetting it upon performing long click).

Change-Id: I8b60e7ea2c1e8ae830b4737e94ed2d796265fa24

src/com/android/launcher3/LauncherAppWidgetHostView.java

@@ -33,9 +33,11 @@ import android.view.ViewConfiguration;
 import android.view.ViewDebug;
 import android.view.ViewGroup;
 import android.view.accessibility.AccessibilityNodeInfo;
+import android.widget.AdapterView;
 import android.widget.Advanceable;
 import android.widget.RemoteViews;
 
+import com.android.launcher3.dragndrop.DragLayer;
 import com.android.launcher3.dragndrop.DragLayer.TouchCompleteListener;
 
 import java.lang.reflect.Method;
@@ -45,7 +47,8 @@ import java.util.concurrent.Executor;
 /**
  * {@inheritDoc}
  */
-public class LauncherAppWidgetHostView extends AppWidgetHostView implements TouchCompleteListener {
+public class LauncherAppWidgetHostView extends AppWidgetHostView
+        implements TouchCompleteListener, View.OnLongClickListener {
 
     private static final String TAG = "LauncherWidgetHostView";
 
@@ -56,11 +59,12 @@ public class LauncherAppWidgetHostView extends AppWidgetHostView implements Touc
     // Maintains a list of widget ids which are supposed to be auto advanced.
     private static final SparseBooleanArray sAutoAdvanceWidgetIds = new SparseBooleanArray();
 
-    LayoutInflater mInflater;
+    protected final LayoutInflater mInflater;
+
+    private final CheckLongPressHelper mLongPressHelper;
+    private final StylusEventHelper mStylusEventHelper;
+    private final Context mContext;
 
-    private CheckLongPressHelper mLongPressHelper;
-    private StylusEventHelper mStylusEventHelper;
-    private Context mContext;
     @ViewDebug.ExportedProperty(category = "launcher")
     private int mPreviousOrientation;
 
@@ -69,6 +73,7 @@ public class LauncherAppWidgetHostView extends AppWidgetHostView implements Touc
     @ViewDebug.ExportedProperty(category = "launcher")
     private boolean mChildrenFocused;
 
+    private boolean mIsScrollable;
     private boolean mIsAttachedToWindow;
     private boolean mIsAutoAdvanceRegistered;
     private Runnable mAutoAdvanceRunnable;
@@ -86,7 +91,7 @@ public class LauncherAppWidgetHostView extends AppWidgetHostView implements Touc
     public LauncherAppWidgetHostView(Context context) {
         super(context);
         mContext = context;
-        mLongPressHelper = new CheckLongPressHelper(this);
+        mLongPressHelper = new CheckLongPressHelper(this, this);
         mStylusEventHelper = new StylusEventHelper(new SimpleOnStylusPressListener(this), this);
         mInflater = LayoutInflater.from(context);
         setAccessibilityDelegate(Launcher.getLauncher(context).getAccessibilityDelegate());
@@ -103,6 +108,16 @@ public class LauncherAppWidgetHostView extends AppWidgetHostView implements Touc
         }
     }
 
+    @Override
+    public boolean onLongClick(View view) {
+        if (mIsScrollable) {
+            DragLayer dragLayer = Launcher.getLauncher(getContext()).getDragLayer();
+            dragLayer.requestDisallowInterceptTouchEvent(false);
+        }
+        view.performLongClick();
+        return true;
+    }
+
     @Override
     protected View getErrorView() {
         return mInflater.inflate(R.layout.appwidget_error, this, false);
@@ -120,6 +135,24 @@ public class LauncherAppWidgetHostView extends AppWidgetHostView implements Touc
 
         // The provider info or the views might have changed.
         checkIfAutoAdvance();
+
+        mIsScrollable = checkScrollableRecursively(this);
+    }
+
+    private boolean checkScrollableRecursively(ViewGroup viewGroup) {
+        if (viewGroup instanceof AdapterView) {
+            return true;
+        } else {
+            for (int i=0; i < viewGroup.getChildCount(); i++) {
+                View child = viewGroup.getChildAt(i);
+                if (child instanceof ViewGroup) {
+                    if (checkScrollableRecursively((ViewGroup) child)) {
+                        return true;
+                    }
+                }
+            }
+        }
+        return false;
     }
 
     public boolean isReinflateRequired() {
@@ -150,12 +183,18 @@ public class LauncherAppWidgetHostView extends AppWidgetHostView implements Touc
             mLongPressHelper.cancelLongPress();
             return true;
         }
+
         switch (ev.getAction()) {
             case MotionEvent.ACTION_DOWN: {
+                DragLayer dragLayer = Launcher.getLauncher(getContext()).getDragLayer();
+
+                if (mIsScrollable) {
+                     dragLayer.requestDisallowInterceptTouchEvent(true);
+                }
                 if (!mStylusEventHelper.inStylusButtonPressed()) {
                     mLongPressHelper.postCheckForLongPress();
                 }
-                Launcher.getLauncher(getContext()).getDragLayer().setTouchCompleteListener(this);
+                dragLayer.setTouchCompleteListener(this);
                 break;
             }