From fd968a79a89e1762f048cf1f6855be6351c3c559 Mon Sep 17 00:00:00 2001
From: Kevin <kevhan@google.com>
Date: Fri, 10 May 2019 15:57:10 -0700
Subject: [PATCH] Scale down thumbnail with app surface

The recents Go app to overview transition has app scale down to a
thumbnail but normally covers the thumbnail.  However, apps with
transparency will be semi-visible and will allow the user to see
the thumbnail in the back at its final size. Instead, we should fit
the thumbnail to the surface so that they both scale down at the same
time.

Bug: 132458092
Test: Go to app with transparency, scale down
Change-Id: Iaebeaaf2ddcfc86fd4f55ef9d8c3f19583947c48
---
 go/quickstep/res/layout/task_item_view.xml    |  3 +-
 .../quickstep/views/IconRecentsView.java      | 42 +++++++++++++++++--
 2 files changed, 41 insertions(+), 4 deletions(-)

diff --git a/go/quickstep/res/layout/task_item_view.xml b/go/quickstep/res/layout/task_item_view.xml
index 699178d57f..ab2cf2804b 100644
--- a/go/quickstep/res/layout/task_item_view.xml
+++ b/go/quickstep/res/layout/task_item_view.xml
@@ -18,7 +18,8 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="@dimen/task_item_height"
-    android:orientation="horizontal">
+    android:orientation="horizontal"
+    android:clipChildren="false">
     <com.android.quickstep.views.TaskThumbnailIconView
         android:id="@+id/task_icon_and_thumbnail"
         android:layout_width="match_parent"
diff --git a/go/quickstep/src/com/android/quickstep/views/IconRecentsView.java b/go/quickstep/src/com/android/quickstep/views/IconRecentsView.java
index 771c7d7fa7..c40d001aa8 100644
--- a/go/quickstep/src/com/android/quickstep/views/IconRecentsView.java
+++ b/go/quickstep/src/com/android/quickstep/views/IconRecentsView.java
@@ -38,6 +38,7 @@ import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.Matrix;
 import android.graphics.Rect;
+import android.graphics.RectF;
 import android.graphics.drawable.Drawable;
 import android.util.ArraySet;
 import android.util.AttributeSet;
@@ -723,6 +724,7 @@ public final class IconRecentsView extends FrameLayout implements Insettable {
         Rect endRect = new Rect();
         thumbnailView.getGlobalVisibleRect(endRect);
         Rect appBounds = appTarget.sourceContainerBounds;
+        RectF currentAppRect = new RectF();
 
         SyncRtSurfaceTransactionApplierCompat surfaceApplier =
                 new SyncRtSurfaceTransactionApplierCompat(this);
@@ -765,17 +767,30 @@ public final class IconRecentsView extends FrameLayout implements Insettable {
 
             @Override
             public void onUpdate(float percent) {
-                appMatrix.preScale(mScaleX.value, mScaleY.value,
+                Matrix m = new Matrix();
+                m.preScale(mScaleX.value, mScaleY.value,
                         appBounds.width() / 2.0f, appBounds.height() / 2.0f);
-                appMatrix.postTranslate(mTranslationX.value, mTranslationY.value);
-
+                m.postTranslate(mTranslationX.value, mTranslationY.value);
+                appMatrix.preConcat(m);
                 params[1] = new SurfaceParams(appTarget.leash, mAlpha.value, appMatrix,
                         null /* windowCrop */, getLayer(appTarget, boostedMode),
                         0 /* cornerRadius */);
                 surfaceApplier.scheduleApply(params);
+
+                m.mapRect(currentAppRect, new RectF(appBounds));
+                setViewToRect(thumbnailView, new RectF(endRect), currentAppRect);
                 appMatrix.reset();
             }
         });
+        remoteAppAnim.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                thumbnailView.setTranslationY(0);
+                thumbnailView.setTranslationX(0);
+                thumbnailView.setScaleX(1);
+                thumbnailView.setScaleY(1);
+            }
+        });
         anim.play(remoteAppAnim);
     }
 
@@ -841,6 +856,27 @@ public final class IconRecentsView extends FrameLayout implements Insettable {
         }
     }
 
+    /**
+     * Set view properties so that the view fits to the target rect.
+     *
+     * @param view view to set
+     * @param origRect original rect that view was located
+     * @param targetRect rect to set to
+     */
+    private void setViewToRect(View view, RectF origRect, RectF targetRect) {
+        float dX = targetRect.left - origRect.left;
+        float dY = targetRect.top - origRect.top;
+        view.setTranslationX(dX);
+        view.setTranslationY(dY);
+
+        float scaleX = targetRect.width() / origRect.width();
+        float scaleY = targetRect.height() / origRect.height();
+        view.setPivotX(0);
+        view.setPivotY(0);
+        view.setScaleX(scaleX);
+        view.setScaleY(scaleY);
+    }
+
     @Override
     public void setInsets(Rect insets) {
         mInsets = insets;