Removing buildLayer call on workspace pages.

> buildLayer was followed by setLayerType(NONE) which was causing the
layer to get destroyed immediately and hece was never useful.
> Also removing mAnimatingViewIntoPlace as after setting this to true
updateChildLayer was never being called.

Change-Id: I08a6da25de002247c956308973f1675c0e61e15c
diff --git a/src/com/android/launcher3/CellLayout.java b/src/com/android/launcher3/CellLayout.java
index f835748..d92b934 100644
--- a/src/com/android/launcher3/CellLayout.java
+++ b/src/com/android/launcher3/CellLayout.java
@@ -355,10 +355,6 @@
         mShortcutsAndWidgets.setLayerType(hasLayer ? LAYER_TYPE_HARDWARE : LAYER_TYPE_NONE, sPaint);
     }
 
-    public void buildHardwareLayer() {
-        mShortcutsAndWidgets.buildLayer();
-    }
-
     public void setCellDimensions(int width, int height) {
         mFixedCellWidth = mCellWidth = width;
         mFixedCellHeight = mCellHeight = height;
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 3a8d260..5d63694 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -74,7 +74,6 @@
 import android.view.View;
 import android.view.View.OnLongClickListener;
 import android.view.ViewGroup;
-import android.view.ViewTreeObserver;
 import android.view.WindowManager;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityManager;
@@ -302,14 +301,6 @@
     // simply unregister this runnable.
     private Runnable mExitSpringLoadedModeRunnable;
 
-    @Thunk final Runnable mBuildLayersRunnable = new Runnable() {
-        public void run() {
-            if (mWorkspace != null) {
-                mWorkspace.buildPageHardwareLayers();
-            }
-        }
-    };
-
     // Activity result which needs to be processed after workspace has loaded.
     private ActivityResultInfo mPendingActivityResult;
     /**
@@ -961,6 +952,8 @@
             mLauncherCallbacks.onResume();
         }
 
+        clearTypedText();
+
         TraceHelper.endSection("ON_RESUME");
     }
 
@@ -1467,44 +1460,6 @@
         }
     }
 
-    public void onWindowVisibilityChanged(int visibility) {
-        // The following code used to be in onResume, but it turns out onResume is called when
-        // you're in All Apps and click home to go to the workspace. onWindowVisibilityChanged
-        // is a more appropriate event to handle
-        if (visibility == View.VISIBLE) {
-            if (!mWorkspaceLoading) {
-                final ViewTreeObserver observer = mWorkspace.getViewTreeObserver();
-                // We want to let Launcher draw itself at least once before we force it to build
-                // layers on all the workspace pages, so that transitioning to Launcher from other
-                // apps is nice and speedy.
-                observer.addOnDrawListener(new ViewTreeObserver.OnDrawListener() {
-                    private boolean mStarted = false;
-                    public void onDraw() {
-                        if (mStarted) return;
-                        mStarted = true;
-                        // We delay the layer building a bit in order to give
-                        // other message processing a time to run.  In particular
-                        // this avoids a delay in hiding the IME if it was
-                        // currently shown, because doing that may involve
-                        // some communication back with the app.
-                        mWorkspace.postDelayed(mBuildLayersRunnable, 500);
-                        final ViewTreeObserver.OnDrawListener listener = this;
-                        mWorkspace.post(new Runnable() {
-                            public void run() {
-                                if (mWorkspace != null &&
-                                        mWorkspace.getViewTreeObserver() != null) {
-                                    mWorkspace.getViewTreeObserver().
-                                            removeOnDrawListener(listener);
-                                }
-                            }
-                        });
-                    }
-                });
-            }
-            clearTypedText();
-        }
-    }
-
     public DragLayer getDragLayer() {
         return mDragLayer;
     }
@@ -1689,7 +1644,6 @@
         super.onDestroy();
 
         unregisterReceiver(mReceiver);
-        mWorkspace.removeCallbacks(mBuildLayersRunnable);
         mWorkspace.removeFolderListeners();
 
         // Stop callbacks from LauncherModel
diff --git a/src/com/android/launcher3/Workspace.java b/src/com/android/launcher3/Workspace.java
index c82731f..430e0aa 100644
--- a/src/com/android/launcher3/Workspace.java
+++ b/src/com/android/launcher3/Workspace.java
@@ -228,7 +228,6 @@
     private State mState = State.NORMAL;
     private boolean mIsSwitchingState = false;
 
-    boolean mAnimatingViewIntoPlace = false;
     boolean mChildrenLayersEnabled = true;
 
     private boolean mStripScreensOnPageStopMoving = false;
@@ -406,7 +405,7 @@
             }
         }
 
-        updateChildrenLayersEnabled(false);
+        updateChildrenLayersEnabled();
         mLauncher.lockScreenOrientation();
         mLauncher.onInteractionBegin();
         // Prevent any Un/InstallShortcutReceivers from updating the db while we are dragging
@@ -459,7 +458,7 @@
             removeExtraEmptyScreen(true, mDragSourceInternal != null);
         }
 
-        updateChildrenLayersEnabled(false);
+        updateChildrenLayersEnabled();
         mLauncher.unlockScreenOrientation(false);
 
         // Re-enable any Un/InstallShortcutReceiver and now process any queued items
@@ -1016,10 +1015,6 @@
                 || (mTransitionProgress > FINISHED_SWITCHING_STATE_TRANSITION_PROGRESS);
     }
 
-    protected void onWindowVisibilityChanged (int visibility) {
-        mLauncher.onWindowVisibilityChanged(visibility);
-    }
-
     @Override
     public boolean dispatchUnhandledMove(View focused, int direction) {
         if (workspaceInModalState() || !isFinishedSwitchingState()) {
@@ -1109,12 +1104,12 @@
 
     protected void onPageBeginTransition() {
         super.onPageBeginTransition();
-        updateChildrenLayersEnabled(false);
+        updateChildrenLayersEnabled();
     }
 
     protected void onPageEndTransition() {
         super.onPageEndTransition();
-        updateChildrenLayersEnabled(false);
+        updateChildrenLayersEnabled();
 
         if (mDragController.isDragging()) {
             if (workspaceInModalState()) {
@@ -1494,9 +1489,9 @@
         return mState == State.NORMAL || mState == State.SPRING_LOADED;
     }
 
-    @Thunk void updateChildrenLayersEnabled(boolean force) {
+    private void updateChildrenLayersEnabled() {
         boolean small = mState == State.OVERVIEW || mIsSwitchingState;
-        boolean enableChildrenLayers = force || small || mAnimatingViewIntoPlace || isPageInTransition();
+        boolean enableChildrenLayers = small || isPageInTransition();
 
         if (enableChildrenLayers != mChildrenLayersEnabled) {
             mChildrenLayersEnabled = enableChildrenLayers;
@@ -1562,19 +1557,6 @@
         }
     }
 
-    public void buildPageHardwareLayers() {
-        // force layers to be enabled just for the call to buildLayer
-        updateChildrenLayersEnabled(true);
-        if (getWindowToken() != null) {
-            final int childCount = getChildCount();
-            for (int i = 0; i < childCount; i++) {
-                CellLayout cl = (CellLayout) getChildAt(i);
-                cl.buildHardwareLayer();
-            }
-        }
-        updateChildrenLayersEnabled(false);
-    }
-
     protected void onWallpaperTap(MotionEvent ev) {
         final int[] position = mTempXY;
         getLocationOnScreen(position);
@@ -1773,12 +1755,12 @@
         }
         invalidate(); // This will call dispatchDraw(), which calls getVisiblePages().
 
-        updateChildrenLayersEnabled(false);
+        updateChildrenLayersEnabled();
     }
 
     public void onEndStateTransition() {
         mIsSwitchingState = false;
-        updateChildrenLayersEnabled(false);
+        updateChildrenLayersEnabled();
         mForceDrawAdjacentPages = false;
         mTransitionProgress = 1;
     }
@@ -2262,16 +2244,6 @@
             }
 
             final CellLayout parent = (CellLayout) cell.getParent().getParent();
-            // Prepare it to be animated into its new position
-            // This must be called after the view has been re-parented
-            final Runnable onCompleteRunnable = new Runnable() {
-                @Override
-                public void run() {
-                    mAnimatingViewIntoPlace = false;
-                    updateChildrenLayersEnabled(false);
-                }
-            };
-            mAnimatingViewIntoPlace = true;
             if (d.dragView.hasDrawn()) {
                 if (droppedOnOriginalCellDuringTransition) {
                     // Animate the item to its original position, while simultaneously exiting
@@ -2290,12 +2262,11 @@
                 if (isWidget) {
                     int animationType = resizeOnDrop ? ANIMATE_INTO_POSITION_AND_RESIZE :
                             ANIMATE_INTO_POSITION_AND_DISAPPEAR;
-                    animateWidgetDrop(info, parent, d.dragView,
-                            onCompleteRunnable, animationType, cell, false);
+                    animateWidgetDrop(info, parent, d.dragView, null, animationType, cell, false);
                 } else {
                     int duration = snapScreen < 0 ? -1 : ADJACENT_SCREEN_DROP_DURATION;
                     mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, cell, duration,
-                            onCompleteRunnable, this);
+                            null, this);
                 }
             } else {
                 d.deferDragViewCleanupPostAnimation = false;
@@ -3147,7 +3118,7 @@
 
         // hardware layers on children are enabled on startup, but should be disabled until
         // needed
-        updateChildrenLayersEnabled(false);
+        updateChildrenLayersEnabled();
     }
 
     /**