New folder icon style (uncropped icons).

- Switch Circle to PathShape as it allows for more flexibility on
  choosing what gets cropped.
- Remove shadows, and stroke.

Bug: 188095988
Test: manual
Change-Id: I602b3efcd35c2c11dc3461f49099c2f2a56eae59
diff --git a/res/layout/user_folder_icon_normalized.xml b/res/layout/user_folder_icon_normalized.xml
index 8b18857..15131f1 100644
--- a/res/layout/user_folder_icon_normalized.xml
+++ b/res/layout/user_folder_icon_normalized.xml
@@ -18,7 +18,6 @@
     xmlns:launcher="http://schemas.android.com/apk/res-auto"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
-    android:background="@drawable/round_rect_folder"
     android:orientation="vertical" >
 
     <com.android.launcher3.folder.FolderPagedView
diff --git a/src/com/android/launcher3/folder/ClippedFolderIconLayoutRule.java b/src/com/android/launcher3/folder/ClippedFolderIconLayoutRule.java
index c67efef..68bed44 100644
--- a/src/com/android/launcher3/folder/ClippedFolderIconLayoutRule.java
+++ b/src/com/android/launcher3/folder/ClippedFolderIconLayoutRule.java
@@ -5,10 +5,10 @@
     public static final int MAX_NUM_ITEMS_IN_PREVIEW = 4;
     private static final int MIN_NUM_ITEMS_IN_PREVIEW = 2;
 
-    private static final float MIN_SCALE = 0.48f;
-    private static final float MAX_SCALE = 0.58f;
-    private static final float MAX_RADIUS_DILATION = 0.15f;
-    private static final float ITEM_RADIUS_SCALE_FACTOR = 1.33f;
+    private static final float MIN_SCALE = 0.44f;
+    private static final float MAX_SCALE = 0.54f;
+    private static final float MAX_RADIUS_DILATION = 0.10f;
+    private static final float ITEM_RADIUS_SCALE_FACTOR = 1.2f;
 
     public static final int EXIT_INDEX = -2;
     public static final int ENTER_INDEX = -3;
@@ -130,10 +130,8 @@
     public float scaleForItem(int numItems) {
         // Scale is determined by the number of items in the preview.
         final float scale;
-        if (numItems <= 2) {
+        if (numItems <= 3) {
             scale = MAX_SCALE;
-        } else if (numItems == 3) {
-            scale = (MAX_SCALE + MIN_SCALE) / 2;
         } else {
             scale = MIN_SCALE;
         }
diff --git a/src/com/android/launcher3/folder/Folder.java b/src/com/android/launcher3/folder/Folder.java
index e387627..17c1329 100644
--- a/src/com/android/launcher3/folder/Folder.java
+++ b/src/com/android/launcher3/folder/Folder.java
@@ -41,6 +41,7 @@
 import android.graphics.Path;
 import android.graphics.Rect;
 import android.graphics.RectF;
+import android.graphics.drawable.Drawable;
 import android.graphics.drawable.GradientDrawable;
 import android.os.Build;
 import android.text.InputType;
@@ -67,6 +68,7 @@
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
+import androidx.core.content.res.ResourcesCompat;
 import androidx.core.graphics.ColorUtils;
 
 import com.android.launcher3.AbstractFloatingView;
@@ -250,6 +252,8 @@
     // so that we can cancel it when starting mColorChangeAnimator.
     private ObjectAnimator mOpenAnimationColorChangeAnimator;
 
+    private GradientDrawable mBackground;
+
     /**
      * Used to inflate the Workspace from XML.
      *
@@ -268,6 +272,12 @@
         // name is complete, we have something to focus on, thus hiding the cursor and giving
         // reliable behavior when clicking the text field (since it will always gain focus on click).
         setFocusableInTouchMode(true);
+
+    }
+
+    @Override
+    public Drawable getBackground() {
+        return mBackground;
     }
 
     @Override
@@ -276,6 +286,9 @@
         final DeviceProfile dp = mActivityContext.getDeviceProfile();
         final int paddingLeftRight = dp.folderContentPaddingLeftRight;
 
+        mBackground = (GradientDrawable) ResourcesCompat.getDrawable(getResources(),
+                R.drawable.round_rect_folder, getContext().getTheme());
+
         mContent = findViewById(R.id.folder_content);
         mContent.setPadding(paddingLeftRight, dp.folderContentPaddingTop, paddingLeftRight, 0);
         mContent.setFolder(this);
@@ -1213,6 +1226,8 @@
         lp.x = left;
         lp.y = top;
 
+        mBackground.setBounds(0, 0, width, height);
+
         if (mColorExtractor != null) {
             mColorExtractor.removeLocations();
             mColorExtractor.setListener(mColorListener);
@@ -1714,14 +1729,16 @@
     }
 
     @Override
-    public void draw(Canvas canvas) {
+    protected void dispatchDraw(Canvas canvas) {
         if (mClipPath != null) {
             int count = canvas.save();
             canvas.clipPath(mClipPath);
-            super.draw(canvas);
+            mBackground.draw(canvas);
             canvas.restoreToCount(count);
+            super.dispatchDraw(canvas);
         } else {
-            super.draw(canvas);
+            mBackground.draw(canvas);
+            super.dispatchDraw(canvas);
         }
     }
 
diff --git a/src/com/android/launcher3/folder/FolderAnimationManager.java b/src/com/android/launcher3/folder/FolderAnimationManager.java
index 7fbfb89..bd0dbfd 100644
--- a/src/com/android/launcher3/folder/FolderAnimationManager.java
+++ b/src/com/android/launcher3/folder/FolderAnimationManager.java
@@ -37,6 +37,7 @@
 
 import com.android.launcher3.BubbleTextView;
 import com.android.launcher3.CellLayout;
+import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.R;
 import com.android.launcher3.ShortcutAndWidgetContainer;
 import com.android.launcher3.Utilities;
@@ -80,6 +81,8 @@
 
     private ObjectAnimator mBgColorAnimator;
 
+    private DeviceProfile mDeviceProfile;
+
     public FolderAnimationManager(Folder folder, boolean isOpening) {
         mFolder = folder;
         mContent = folder.mContent;
@@ -89,7 +92,8 @@
         mPreviewBackground = mFolderIcon.mBackground;
 
         mContext = folder.getContext();
-        mPreviewVerifier = new FolderGridOrganizer(folder.mActivityContext.getDeviceProfile().inv);
+        mDeviceProfile = folder.mActivityContext.getDeviceProfile();
+        mPreviewVerifier = new FolderGridOrganizer(mDeviceProfile.inv);
 
         mIsOpening = isOpening;
 
@@ -211,8 +215,21 @@
         play(a, getAnimator(mFolder.mContent, SCALE_PROPERTY, initialScale, finalScale));
         play(a, getAnimator(mFolder.mFooter, SCALE_PROPERTY, initialScale, finalScale));
         play(a, mFolderIcon.mFolderName.createTextAlphaAnimator(!mIsOpening));
+
+        // Create reveal animator for the folder background
         play(a, getShape().createRevealAnimator(
                 mFolder, startRect, endRect, finalRadius, !mIsOpening));
+
+        // Create reveal animator for the folder content (capture the top 4 icons 2x2)
+        int width = mContent.getPaddingLeft() + mDeviceProfile.folderCellLayoutBorderSpacingPx
+                + mDeviceProfile.folderCellWidthPx * 2;
+        int height = mContent.getPaddingTop() + mDeviceProfile.folderCellLayoutBorderSpacingPx
+                + mDeviceProfile.folderCellHeightPx * 2;
+        Rect startRect2 = new Rect(0, 0, width, height);
+        play(a, getShape().createRevealAnimator(
+                mFolder.getContent(), startRect2, endRect, finalRadius, !mIsOpening));
+
+
         // Fade in the folder name, as the text can overlap the icons when grid size is small.
         mFolder.mFolderName.setAlpha(mIsOpening ? 0f : 1f);
         play(a, getAnimator(mFolder.mFolderName, View.ALPHA, 0, 1),
diff --git a/src/com/android/launcher3/folder/FolderIcon.java b/src/com/android/launcher3/folder/FolderIcon.java
index 279c445..6b12d86 100644
--- a/src/com/android/launcher3/folder/FolderIcon.java
+++ b/src/com/android/launcher3/folder/FolderIcon.java
@@ -614,10 +614,7 @@
 
         if (mCurrentPreviewItems.isEmpty() && !mAnimating) return;
 
-        final int saveCount = canvas.save();
-        canvas.clipPath(mBackground.getClipPath());
         mPreviewItemManager.draw(canvas);
-        canvas.restoreToCount(saveCount);
 
         if (!mBackground.drawingDelegated()) {
             mBackground.drawBackgroundStroke(canvas);
diff --git a/src/com/android/launcher3/folder/FolderPagedView.java b/src/com/android/launcher3/folder/FolderPagedView.java
index 7fc3740..3d2884a 100644
--- a/src/com/android/launcher3/folder/FolderPagedView.java
+++ b/src/com/android/launcher3/folder/FolderPagedView.java
@@ -22,6 +22,7 @@
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.graphics.Canvas;
+import android.graphics.Path;
 import android.graphics.drawable.Drawable;
 import android.util.ArrayMap;
 import android.util.AttributeSet;
@@ -49,6 +50,7 @@
 import com.android.launcher3.util.Thunk;
 import com.android.launcher3.util.ViewCache;
 import com.android.launcher3.views.ActivityContext;
+import com.android.launcher3.views.ClipPathView;
 
 import java.util.ArrayList;
 import java.util.Iterator;
@@ -57,7 +59,7 @@
 import java.util.function.ToIntFunction;
 import java.util.stream.Collectors;
 
-public class FolderPagedView extends PagedView<PageIndicatorDots> {
+public class FolderPagedView extends PagedView<PageIndicatorDots> implements ClipPathView {
 
     private static final String TAG = "FolderPagedView";
 
@@ -89,6 +91,8 @@
 
     private Folder mFolder;
 
+    private Path mClipPath;
+
     // If the views are attached to the folder or not. A folder should be bound when its
     // animating or is open.
     private boolean mViewsBound = false;
@@ -128,8 +132,16 @@
 
     @Override
     protected void dispatchDraw(Canvas canvas) {
-        mFocusIndicatorHelper.draw(canvas);
-        super.dispatchDraw(canvas);
+        if (mClipPath != null) {
+            int count = canvas.save();
+            canvas.clipPath(mClipPath);
+            mFocusIndicatorHelper.draw(canvas);
+            super.dispatchDraw(canvas);
+            canvas.restoreToCount(count);
+        } else {
+            mFocusIndicatorHelper.draw(canvas);
+            super.dispatchDraw(canvas);
+        }
     }
 
     /**
@@ -628,4 +640,10 @@
     public int itemsPerPage() {
         return mOrganizer.getMaxItemsPerPage();
     }
+
+    @Override
+    public void setClipPath(Path clipPath) {
+        mClipPath = clipPath;
+        invalidate();
+    }
 }
diff --git a/src/com/android/launcher3/folder/PreviewBackground.java b/src/com/android/launcher3/folder/PreviewBackground.java
index 4eab63e..204decb 100644
--- a/src/com/android/launcher3/folder/PreviewBackground.java
+++ b/src/com/android/launcher3/folder/PreviewBackground.java
@@ -51,6 +51,7 @@
 public class PreviewBackground extends CellLayout.DelegatedCellDrawing {
 
     private static final boolean DRAW_SHADOW = false;
+    private static final boolean DRAW_STROKE = false;
 
     private static final int CONSUMPTION_ANIMATION_DURATION = 100;
 
@@ -303,6 +304,10 @@
     }
 
     public void animateBackgroundStroke() {
+        if (!DRAW_STROKE) {
+            return;
+        }
+
         if (mStrokeAlphaAnimator != null) {
             mStrokeAlphaAnimator.cancel();
         }
@@ -319,6 +324,9 @@
     }
 
     public void drawBackgroundStroke(Canvas canvas) {
+        if (!DRAW_STROKE) {
+            return;
+        }
         mPaint.setColor(setColorAlphaBound(mStrokeColor, mStrokeAlpha));
         mPaint.setStyle(Paint.Style.STROKE);
         mPaint.setStrokeWidth(mStrokeWidth);
@@ -363,7 +371,7 @@
         }
 
         mDrawingDelegate = null;
-        isClipping = true;
+        isClipping = false;
         invalidate();
     }
 
diff --git a/src/com/android/launcher3/graphics/IconShape.java b/src/com/android/launcher3/graphics/IconShape.java
index 2da679c..f82b07e 100644
--- a/src/com/android/launcher3/graphics/IconShape.java
+++ b/src/com/android/launcher3/graphics/IconShape.java
@@ -156,19 +156,43 @@
         }
     }
 
-    public static final class Circle extends SimpleRectShape {
+    public static final class Circle extends PathShape {
 
-        @Override
-        public void drawShape(Canvas canvas, float offsetX, float offsetY, float radius, Paint p) {
-            canvas.drawCircle(radius + offsetX, radius + offsetY, radius, p);
+        private final float[] mTempRadii = new float[8];
+
+        protected AnimatorUpdateListener newUpdateListener(Rect startRect, Rect endRect,
+                float endRadius, Path outPath) {
+            float r1 = getStartRadius(startRect);
+
+            float[] startValues = new float[] {
+                    startRect.left, startRect.top, startRect.right, startRect.bottom, r1, r1};
+            float[] endValues = new float[] {
+                    endRect.left, endRect.top, endRect.right, endRect.bottom, endRadius, endRadius};
+
+            FloatArrayEvaluator evaluator = new FloatArrayEvaluator(new float[6]);
+
+            return (anim) -> {
+                float progress = (Float) anim.getAnimatedValue();
+                float[] values = evaluator.evaluate(progress, startValues, endValues);
+                outPath.addRoundRect(
+                        values[0], values[1], values[2], values[3],
+                        getRadiiArray(values[4], values[5]), Path.Direction.CW);
+            };
         }
 
+        private float[] getRadiiArray(float r1, float r2) {
+            mTempRadii[0] = mTempRadii [1] = mTempRadii[2] = mTempRadii[3] =
+                    mTempRadii[6] = mTempRadii[7] = r1;
+            mTempRadii[4] = mTempRadii[5] = r2;
+            return mTempRadii;
+        }
+
+
         @Override
         public void addToPath(Path path, float offsetX, float offsetY, float radius) {
             path.addCircle(radius + offsetX, radius + offsetY, radius, Path.Direction.CW);
         }
 
-        @Override
         protected float getStartRadius(Rect startRect) {
             return startRect.width() / 2f;
         }