commit 2591f6a5202664faf8cde2b68361e3842ce76ba9
author Adam Cohen <adamcohen@google.com> Tue Oct 25 14:36:40 2011 -0700
committer Adam Cohen <adamcohen@google.com> Tue Oct 25 14:37:45 2011 -0700
tree fdbf4241544e217fa49b89ed39b1e93cc6b71bab
parent f060868dd6ca8fb2f199fefd5cbb19a75ac2c108

Fixing AppsCustomize paging effect on tablet

Change-Id: I9ec1faeb4efa1b3db338bf47dceee72befbc682e

src/com/android/launcher2/AppsCustomizePagedView.java

diff --git a/src/com/android/launcher2/AppsCustomizePagedView.java b/src/com/android/launcher2/AppsCustomizePagedView.java
index d8ff73c..f5142bf 100644
--- a/src/com/android/launcher2/AppsCustomizePagedView.java
+++ b/src/com/android/launcher2/AppsCustomizePagedView.java
@@ -31,11 +31,11 @@
 import android.content.res.Resources;
 import android.content.res.TypedArray;
 import android.graphics.Bitmap;
-import android.graphics.Bitmap.Config;
 import android.graphics.Canvas;
 import android.graphics.PorterDuff;
 import android.graphics.Rect;
 import android.graphics.RectF;
+import android.graphics.Bitmap.Config;
 import android.graphics.drawable.Drawable;
 import android.os.AsyncTask;
 import android.os.Process;
@@ -47,6 +47,8 @@
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.animation.AccelerateInterpolator;
+import android.view.animation.DecelerateInterpolator;
+import android.view.animation.Interpolator;
 import android.widget.GridLayout;
 import android.widget.ImageView;
 import android.widget.Toast;
@@ -218,6 +220,7 @@
     private static float TRANSITION_MAX_ROTATION = 22;
     private static final boolean PERFORM_OVERSCROLL_ROTATION = true;
     private AccelerateInterpolator mAlphaInterpolator = new AccelerateInterpolator(0.9f);
+    private DecelerateInterpolator mLeftScreenAlphaInterpolator = new DecelerateInterpolator(4);
 
     // Previews & outlines
     ArrayList<AppsCustomizeAsyncTask> mRunningTasks;
@@ -262,7 +265,7 @@
         // (top + bottom)
         mWidgetPreviewIconPaddedDimension =
             (int) (mAppIconSize * (1 + (2 * sWidgetPreviewIconPaddingPercentage)));
-        mFadeInAdjacentScreens = LauncherApplication.isScreenLarge();
+        mFadeInAdjacentScreens = false;
     }
 
     @Override
@@ -1218,8 +1221,15 @@
                         interpolatedProgress * TRANSITION_SCALE_FACTOR;
                 float translationX = Math.min(0, scrollProgress) * v.getMeasuredWidth();
 
-                float alpha = scrollProgress < 0 ? mAlphaInterpolator.getInterpolation(
+                float alpha;
+
+                if (!LauncherApplication.isScreenLarge() || scrollProgress < 0) {
+                    alpha = scrollProgress < 0 ? mAlphaInterpolator.getInterpolation(
                         1 - Math.abs(scrollProgress)) : 1.0f;
+                } else {
+                    // On large screens we need to fade the page as it nears its leftmost position
+                    alpha = mLeftScreenAlphaInterpolator.getInterpolation(1 - scrollProgress);
+                }
 
                 v.setCameraDistance(mDensity * CAMERA_DISTANCE);
                 int pageWidth = v.getMeasuredWidth();

src/com/android/launcher2/PagedView.java

diff --git a/src/com/android/launcher2/PagedView.java b/src/com/android/launcher2/PagedView.java
index 7be19bf..3d2deb8 100644
--- a/src/com/android/launcher2/PagedView.java
+++ b/src/com/android/launcher2/PagedView.java
@@ -102,6 +102,7 @@
     protected final static float ALPHA_QUANTIZE_LEVEL = 0.0001f;
 
     protected int mTouchState = TOUCH_STATE_REST;
+    protected boolean mForceScreenScrolled = false;
 
     protected OnLongClickListener mLongClickListener;
 
@@ -672,14 +673,25 @@
     }
 
     @Override
+    protected void onViewAdded(View child) {
+        super.onViewAdded(child);
+
+        // This ensures that when children are added, they get the correct transforms / alphas
+        // in accordance with any scroll effects.
+        mForceScreenScrolled = true;
+        invalidate();
+    }
+
+    @Override
     protected void dispatchDraw(Canvas canvas) {
         int halfScreenSize = getMeasuredWidth() / 2;
         int screenCenter = mScrollX + halfScreenSize;
 
-        if (screenCenter != mLastScreenCenter) {
+        if (screenCenter != mLastScreenCenter || mForceScreenScrolled) {
             screenScrolled(screenCenter);
             updateAdjacentPagesAlpha();
             mLastScreenCenter = screenCenter;
+            mForceScreenScrolled = false;
         }
 
         // Find out which screens are visible; as an optimization we only call draw on them