Fix bug 2250457 - Open folder on home screen changes changes the behaviour of the home button

Now, home always goes to the center worksapce screen and back from an
app goes to all apps if it was open.

Getting that animations smooth took a little bit of work.

src/com/android/launcher2/AllAppsView.java

@@ -112,6 +112,9 @@ public class AllAppsView extends RSSurfaceView
 
     private boolean mShouldGainFocus;
 
+    private boolean mZoomDirty = false;
+    private float mNextZoom;
+    private boolean mNextAnimate;
 
     static class Defines {
         public static final int ALLOC_PARAMS = 0;
@@ -185,7 +188,6 @@ public class AllAppsView extends RSSurfaceView
         super.surfaceChanged(holder, format, w, h);
 
         if (mRS == null) {
-
             mRS = createRenderScript(true);
             mRollo = new RolloRS();
             mRollo.mHasSurface = true;
@@ -198,6 +200,7 @@ public class AllAppsView extends RSSurfaceView
                 gainFocus();
                 mShouldGainFocus = false;
             }
+            mRollo.dirtyCheck();
         } else {
             mRollo.mHasSurface = true;
             mRollo.dirtyCheck();
@@ -572,32 +575,44 @@ public class AllAppsView extends RSSurfaceView
     }
 
     /**
-     * Zoom to the specifed amount.
+     * Zoom to the specifed level.
      *
-     * @param amount [0..1] 0 is hidden, 1 is open
+     * @param zoom [0..1] 0 is hidden, 1 is open
      */
-    public void zoom(float amount) {
-        if (mRollo == null) {
-            return;
-        }
-
+    public void zoom(float zoom, boolean animate) {
         cancelLongPress();
-        mRollo.clearSelectedIcon();
-        mRollo.setHomeSelected(SELECTED_NONE);
-        if (amount > 0.001f) {
-            // set in readback, so we're correct even before the next frame
-            mRollo.mState.zoomTarget = amount;
+        if (mRollo == null || !mRollo.mHasSurface) {
+            mZoomDirty = true;
+            mNextZoom = zoom;
+            mNextAnimate = animate;
+            return;
         } else {
-            mRollo.mState.zoomTarget = 0;
+            mRollo.setZoom(zoom, animate);
         }
-        mRollo.mState.save();
     }
 
     public boolean isVisible() {
-        if (mRollo == null) {
-            return false;
+        if (mZoomDirty) {
+            return mNextZoom > 0.001f;
+        } else {
+            if (mRollo == null) {
+                return false;
+            } else {
+                return mRollo.mMessageProc.mZoom > 0.001f;
+            }
+        }
+    }
+
+    public boolean isOpaque() {
+        if (mZoomDirty) {
+            return mNextZoom > 0.999f;
+        } else {
+            if (mRollo == null) {
+                return false;
+            } else {
+                return mRollo.mMessageProc.mZoom > 0.999f;
+            }
         }
-        return mRollo.mMessageProc.mZoom > 0.001f;
     }
 
     /*
@@ -729,7 +744,7 @@ public class AllAppsView extends RSSurfaceView
         private Script.Invokable mInvokeMoveTo;
         private Script.Invokable mInvokeFling;
         private Script.Invokable mInvokeResetWAR;
-
+        private Script.Invokable mInvokeSetZoom;
 
         private ProgramStore mPSIcons;
         private ProgramStore mPSText;
@@ -1003,6 +1018,7 @@ public class AllAppsView extends RSSurfaceView
             mInvokeFling = sb.addInvokable("fling");
             mInvokeMoveTo = sb.addInvokable("moveTo");
             mInvokeResetWAR = sb.addInvokable("resetHWWar");
+            mInvokeSetZoom = sb.addInvokable("setZoom");
             mScript = sb.create();
             mScript.setClearColor(0.0f, 0.0f, 0.0f, 0.0f);
             mScript.bindAllocation(mParams.mAlloc, Defines.ALLOC_PARAMS);
@@ -1022,10 +1038,16 @@ public class AllAppsView extends RSSurfaceView
         }
 
         void dirtyCheck() {
-            if (mAppsDirty && mHasSurface) {
-                uploadApps(mAllAppsList);
-                saveAppsList();
-                mAppsDirty = false;
+            if (mHasSurface) {
+                if (mAppsDirty) {
+                    uploadApps(mAllAppsList);
+                    saveAppsList();
+                    mAppsDirty = false;
+                }
+                if (mZoomDirty) {
+                    setZoom(mNextZoom, mNextAnimate);
+                    mZoomDirty = false;
+                }
             }
         }
 
@@ -1053,6 +1075,20 @@ public class AllAppsView extends RSSurfaceView
             saveAppsList();
         }
 
+        private void setZoom(float zoom, boolean animate) {
+            mRollo.clearSelectedIcon();
+            mRollo.setHomeSelected(SELECTED_NONE);
+            if (zoom > 0.001f) {
+                mRollo.mState.zoomTarget = zoom;
+            } else {
+                mRollo.mState.zoomTarget = 0;
+            }
+            mRollo.mState.save();
+            if (!animate) {
+                mRollo.mInvokeSetZoom.execute();
+            }
+        }
+
         private void frameBitmapAllocMips(Allocation alloc, int w, int h) {
             int black[] = new int[w > h ? w : h];
             Allocation.Adapter2D a = alloc.createAdapter2D();