Further preventing drags while loading is in progress. (Bug 6276881)

Change-Id: I3fc9ad4cd3d71a8eba4e3bcc0a1b6346c59fbee5

src/com/android/launcher2/Folder.java

@@ -200,6 +200,9 @@ public class Folder extends LinearLayout implements DragSource, View.OnClickList
     }
 
     public boolean onLongClick(View v) {
+        // Return if global dragging is not enabled
+        if (!mLauncher.isDraggingEnabled()) return true;
+
         Object tag = v.getTag();
         if (tag instanceof ShortcutInfo) {
             ShortcutInfo item = (ShortcutInfo) tag;

src/com/android/launcher2/Launcher.java

@@ -496,6 +496,12 @@ public final class Launcher extends Activity
         return mDragLayer;
     }
 
+    boolean isDraggingEnabled() {
+        // We prevent dragging when we are loading the workspace as it is possible to pick up a view
+        // that is subsequently removed from the workspace in startBinding().
+        return !mModel.isLoadingWorkspace();
+    }
+
     static int getScreen() {
         synchronized (sLock) {
             return sScreen;
@@ -2077,14 +2083,9 @@ public final class Launcher extends Activity
     }
 
     public boolean onLongClick(View v) {
-
-        if (mState != State.WORKSPACE) {
-            return false;
-        }
-
-        if (isWorkspaceLocked()) {
-            return false;
-        }
+        if (!isDraggingEnabled()) return false;
+        if (isWorkspaceLocked()) return false;
+        if (mState != State.WORKSPACE) return false;
 
         if (!(v instanceof CellLayout)) {
             v = (View) v.getParent().getParent();

src/com/android/launcher2/LauncherModel.java

@@ -745,6 +745,15 @@ public class LauncherModel extends BroadcastReceiver {
         return mAllAppsLoaded;
     }
 
+    boolean isLoadingWorkspace() {
+        synchronized (mLock) {
+            if (mLoaderTask != null) {
+                return mLoaderTask.isLoadingWorkspace();
+            }
+        }
+        return false;
+    }
+
     /**
      * Runnable for the thread that loads the contents of the launcher:
      *   - workspace icons
@@ -755,6 +764,7 @@ public class LauncherModel extends BroadcastReceiver {
         private Context mContext;
         private Thread mWaitThread;
         private boolean mIsLaunching;
+        private boolean mIsLoadingAndBindingWorkspace;
         private boolean mStopped;
         private boolean mLoadAndBindStepFinished;
         private HashMap<Object, CharSequence> mLabelCache;
@@ -769,7 +779,13 @@ public class LauncherModel extends BroadcastReceiver {
             return mIsLaunching;
         }
 
+        boolean isLoadingWorkspace() {
+            return mIsLoadingAndBindingWorkspace;
+        }
+
         private void loadAndBindWorkspace() {
+            mIsLoadingAndBindingWorkspace = true;
+
             // Load the workspace
             if (DEBUG_LOADERS) {
                 Log.d(TAG, "loadAndBindWorkspace mWorkspaceLoaded=" + mWorkspaceLoaded);
@@ -1381,6 +1397,8 @@ public class LauncherModel extends BroadcastReceiver {
                         Log.d(TAG, "bound workspace in "
                             + (SystemClock.uptimeMillis()-t) + "ms");
                     }
+
+                    mIsLoadingAndBindingWorkspace = false;
                 }
             });
         }

src/com/android/launcher2/PagedViewWithDraggableItems.java

@@ -107,6 +107,8 @@ public abstract class PagedViewWithDraggableItems extends PagedView
         // When we have exited all apps or are in transition, disregard long clicks
         if (!mLauncher.isAllAppsCustomizeOpen() ||
                 mLauncher.getWorkspace().isSwitchingState()) return false;
+        // Return if global dragging is not enabled
+        if (!mLauncher.isDraggingEnabled()) return false;
 
         return beginDragging(v);
     }