Ensuring that we don't start dragging while another drag is in progress.

Change-Id: If3c5a059407efc3ee9a0c9b1b3b7fb942d3a7664

src/com/android/launcher2/AllAppsPagedView.java

@@ -234,10 +234,8 @@ public class AllAppsPagedView extends PagedViewWithDraggableItems implements All
 
     @Override
     protected boolean beginDragging(View v) {
-        if (!v.isInTouchMode()) {
-            return false;
-        }
-        super.beginDragging(v);
+        if (!v.isInTouchMode()) return false;
+        if (!super.beginDragging(v)) return false;
 
         // Start drag mode after the item is selected
         setupDragMode();

src/com/android/launcher2/CustomizePagedView.java

@@ -492,12 +492,13 @@ public class CustomizePagedView extends PagedViewWithDraggableItems
     }
 
     protected boolean beginDragging(View v) {
+        if (!v.isInTouchMode()) return false;
+        if (!super.beginDragging(v)) return false;
+
         // End the current choice mode before we start dragging anything
         if (isChoiceMode(CHOICE_MODE_SINGLE)) {
             endChoiceMode();
         }
-        super.beginDragging(v);
-
         boolean result = false;
         switch (mCustomizationType) {
         case WidgetCustomization: {

src/com/android/launcher2/DragController.java

@@ -390,6 +390,10 @@ public class DragController {
         return mDragging;
     }
 
+    public boolean isDragging() {
+        return mDragging;
+    }
+
     /**
      * Stop dragging without dropping.
      */

src/com/android/launcher2/Launcher.java

@@ -2221,7 +2221,7 @@ public final class Launcher extends Activity
 
         final View itemUnderLongClick = longClickCellInfo.cell;
 
-        if (mWorkspace.allowLongPress()) {
+        if (mWorkspace.allowLongPress() && !mDragController.isDragging()) {
             if (itemUnderLongClick == null) {
                 // User long pressed on empty space
                 mWorkspace.setAllowLongPress(false);

src/com/android/launcher2/PagedViewWithDraggableItems.java

@@ -50,8 +50,9 @@ public abstract class PagedViewWithDraggableItems extends PagedView
     }
 
     protected boolean beginDragging(View v) {
+        boolean wasDragging = mIsDragging;
         mIsDragging = true;
-        return false;
+        return !wasDragging;
     }
 
     protected void cancelDragging() {