Download Home : Decoupled SelectionDelegate from list item view

Removed using SelectableItemView in download home. Instead properties for
selected and selectionModeActive will be set into the ListItem from the mediator.

Bug: 850600, 868205
Change-Id: I36d98b4f7cfde8d6c8a93adae091cd8024b14e3c
Reviewed-on: https://chromium-review.googlesource.com/1150810Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580249}

chrome/android/java/res/layout/download_manager_generic_item.xml

@@ -29,6 +29,17 @@
         app:layout_gravity="center_vertical"
         app:chrometint="@color/dark_mode_tint" />
 
+    <org.chromium.chrome.browser.download.home.view.SelectionView
+        android:id="@+id/selection"
+        android:layout_width="@dimen/download_manager_generic_thumbnail_size"
+        android:layout_height="@dimen/download_manager_generic_thumbnail_size"
+        android:layout_marginStart="16dp"
+        android:layout_marginEnd="16dp"
+        app:layout_column="0"
+        app:layout_row="0"
+        app:layout_rowSpan="2"
+        app:layout_gravity="center_vertical" />
+
     <TextView
         android:id="@+id/title"
         style="@style/DownloadItemText"

chrome/android/java/res/layout/download_manager_image_item.xml

@@ -21,14 +21,12 @@
         android:layout_gravity="center"
         tools:ignore="ContentDescription" />
 
-    <org.chromium.chrome.browser.widget.TintedImageView
+    <org.chromium.chrome.browser.download.home.view.SelectionView
         android:id="@+id/selection"
         android:layout_width="20dp"
         android:layout_height="20dp"
         android:layout_gravity="start|top"
         android:layout_marginStart="6dp"
-        android:layout_marginTop="6dp"
-        android:visibility="gone"
-        app:chrometint="@color/dark_mode_tint"/>
+        android:layout_marginTop="6dp"/>
 
 </FrameLayout>

chrome/android/java/res/layout/list_selection_handle_view.xml

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2018 The Chromium Authors. All rights reserved.
+     Use of this source code is governed by a BSD-style license that can be
+     found in the LICENSE file.
+-->
+
+ <merge
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <org.chromium.chrome.browser.widget.TintedImageView
+        android:id="@+id/check"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:scaleType="center"
+        android:background="@drawable/list_item_icon_modern_bg"
+        android:visibility="gone"
+        app:chrometint="@color/white_mode_tint"
+        app:layout_gravity="center"
+        tools:ignore="ContentDescription" />
+
+    <org.chromium.chrome.browser.widget.TintedImageView
+        android:id="@+id/circle"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_gravity="center"
+        android:background="@null"
+        android:src="@drawable/download_circular_selector_transparent"
+        android:visibility="gone"
+        app:chrometint="@null"
+        tools:ignore="ContentDescription"/>
+
+</merge>

chrome/android/java/src/org/chromium/chrome/browser/download/home/list/DateOrderedListMediator.java

@@ -46,12 +46,39 @@ class DateOrderedListMediator {
     private final OfflineItemSource mSource;
     private final DateOrderedListMutator mListMutator;
     private final ThumbnailProvider mThumbnailProvider;
+    private final MediatorSelectionObserver mSelectionObserver;
 
     private final OffTheRecordOfflineItemFilter mOffTheRecordFilter;
     private final DeleteUndoOfflineItemFilter mDeleteUndoFilter;
     private final TypeOfflineItemFilter mTypeFilter;
     private final SearchOfflineItemFilter mSearchFilter;
 
+    /**
+     * A selection observer that correctly updates the selection state for each item in the list.
+     */
+    private class MediatorSelectionObserver
+            implements SelectionDelegate.SelectionObserver<ListItem> {
+        private final SelectionDelegate<ListItem> mSelectionDelegate;
+
+        public MediatorSelectionObserver(SelectionDelegate<ListItem> delegate) {
+            mSelectionDelegate = delegate;
+            mSelectionDelegate.addObserver(this);
+        }
+
+        @Override
+        public void onSelectionStateChange(List<ListItem> selectedItems) {
+            for (int i = 0; i < mModel.size(); i++) {
+                ListItem item = mModel.get(i);
+                boolean selected = mSelectionDelegate.isItemSelected(item);
+                item.showSelectedAnimation = selected && !item.selected;
+                item.selected = selected;
+                mModel.setItem(i, item);
+            }
+            mModel.dispatchLastEvent();
+            mModel.getProperties().setSelectionModeActive(mSelectionDelegate.isSelectionEnabled());
+        }
+    }
+
     /**
      * Creates an instance of a DateOrderedListMediator that will push {@code provider} into
      * {@code model}.
@@ -86,6 +113,7 @@ class DateOrderedListMediator {
 
         mThumbnailProvider = new ThumbnailProviderImpl(
                 ((ChromeApplication) ContextUtils.getApplicationContext()).getReferencePool());
+        mSelectionObserver = new MediatorSelectionObserver(selectionDelegate);
 
         mModel.getProperties().setEnableItemAnimations(true);
         mModel.getProperties().setOpenCallback(mProvider::openItem);
@@ -95,7 +123,7 @@ class DateOrderedListMediator {
         mModel.getProperties().setShareCallback(item -> {});
         mModel.getProperties().setRemoveCallback(this::onDeleteItem);
         mModel.getProperties().setVisualsProvider(this::getVisuals);
-        mModel.getProperties().setSelectionDelegate(selectionDelegate);
+        mModel.getProperties().setSelectionCallback(selectionDelegate::toggleSelectionForItem);
     }
 
     /** Tears down this mediator. */

chrome/android/java/src/org/chromium/chrome/browser/download/home/list/ListItem.java

@@ -16,6 +16,12 @@ import java.util.Date;
 public abstract class ListItem {
     public final long stableId;
 
+    /** Indicates that we are in multi-select mode and the item is currently selected. */
+    public boolean selected;
+
+    /** Whether animation should be shown for the recent change in selection state for this item. */
+    public boolean showSelectedAnimation;
+
     /** Creates a {@link ListItem} instance. */
     ListItem(long stableId) {
         this.stableId = stableId;

chrome/android/java/src/org/chromium/chrome/browser/download/home/list/ListPropertyModel.java

@@ -6,7 +6,6 @@ package org.chromium.chrome.browser.download.home.list;
 
 import org.chromium.base.Callback;
 import org.chromium.chrome.browser.modelutil.PropertyObservable;
-import org.chromium.chrome.browser.widget.selection.SelectionDelegate;
 import org.chromium.components.offline_items_collection.OfflineItem;
 import org.chromium.components.offline_items_collection.OfflineItemVisuals;
 import org.chromium.components.offline_items_collection.VisualsCallback;
@@ -41,6 +40,8 @@ public class ListPropertyModel extends PropertyObservable<ListPropertyModel.Prop
         static final PropertyKey CALLBACK_CANCEL = new PropertyKey();
         static final PropertyKey CALLBACK_SHARE = new PropertyKey();
         static final PropertyKey CALLBACK_REMOVE = new PropertyKey();
+        static final PropertyKey CALLBACK_SELECTION = new PropertyKey();
+        static final PropertyKey SELECTION_MODE_ACTIVE = new PropertyKey();
 
         // Utility properties.
         static final PropertyKey PROVIDER_VISUALS = new PropertyKey();
@@ -49,14 +50,15 @@ public class ListPropertyModel extends PropertyObservable<ListPropertyModel.Prop
     }
 
     private boolean mEnableItemAnimations;
+    private boolean mSelectionModeActive;
     private Callback<OfflineItem> mOpenCallback;
     private Callback<OfflineItem> mPauseCallback;
     private Callback<OfflineItem> mResumeCallback;
     private Callback<OfflineItem> mCancelCallback;
     private Callback<OfflineItem> mShareCallback;
     private Callback<OfflineItem> mRemoveCallback;
+    private Callback<ListItem> mSelectionCallback;
     private VisualsProvider mVisualsProvider;
-    private SelectionDelegate<ListItem> mSelectionDelegate;
 
     /** Sets whether or not item animations should be enabled. */
     public void setEnableItemAnimations(boolean enableItemAnimations) {
@@ -70,6 +72,18 @@ public class ListPropertyModel extends PropertyObservable<ListPropertyModel.Prop
         return mEnableItemAnimations;
     }
 
+    /** Sets whether or not selection mode is currently active. */
+    public void setSelectionModeActive(boolean selectionModeActive) {
+        if (mSelectionModeActive == selectionModeActive) return;
+        mSelectionModeActive = selectionModeActive;
+        notifyPropertyChanged(PropertyKey.SELECTION_MODE_ACTIVE);
+    }
+
+    /** @return Whether or not selection mode is currently active. */
+    public boolean getSelectionModeActive() {
+        return mSelectionModeActive;
+    }
+
     /** Sets the callback for when a UI action should open a {@link OfflineItem}. */
     public void setOpenCallback(Callback<OfflineItem> callback) {
         if (mOpenCallback == callback) return;
@@ -154,13 +168,15 @@ public class ListPropertyModel extends PropertyObservable<ListPropertyModel.Prop
         return mVisualsProvider;
     }
 
-    /** Sets the selection delegate to handle selection of list items. */
-    public void setSelectionDelegate(SelectionDelegate<ListItem> selectionDelegate) {
-        mSelectionDelegate = selectionDelegate;
+    /** Sets the callback for when an {@link ListItem} is selected or deselected on the UI. */
+    public void setSelectionCallback(Callback<ListItem> callback) {
+        if (mSelectionCallback == callback) return;
+        mSelectionCallback = callback;
+        notifyPropertyChanged(PropertyKey.CALLBACK_SELECTION);
     }
 
-    /** @return The selection delegate to handle multiple item selections. */
-    public SelectionDelegate<ListItem> getSelectionDelegate() {
-        return mSelectionDelegate;
+    /** @return The callback to trigger when a UI action selects or deselects a {@link ListItem}. */
+    public Callback<ListItem> getSelectionCallback() {
+        return mSelectionCallback;
     }
 }

chrome/android/java/src/org/chromium/chrome/browser/download/home/list/ListPropertyViewBinder.java

@@ -33,7 +33,9 @@ class ListPropertyViewBinder
                 || propertyKey == ListPropertyModel.PropertyKey.CALLBACK_CANCEL
                 || propertyKey == ListPropertyModel.PropertyKey.CALLBACK_SHARE
                 || propertyKey == ListPropertyModel.PropertyKey.CALLBACK_REMOVE
-                || propertyKey == ListPropertyModel.PropertyKey.PROVIDER_VISUALS) {
+                || propertyKey == ListPropertyModel.PropertyKey.PROVIDER_VISUALS
+                || propertyKey == ListPropertyModel.PropertyKey.CALLBACK_SELECTION
+                || propertyKey == ListPropertyModel.PropertyKey.SELECTION_MODE_ACTIVE) {
             view.getAdapter().notifyItemChanged(0, view.getAdapter().getItemCount());
         }
     }

chrome/android/java/src/org/chromium/chrome/browser/download/home/list/holder/GenericViewHolder.java

@@ -4,11 +4,9 @@
 
 package org.chromium.chrome.browser.download.home.list.holder;
 
-import android.content.res.ColorStateList;
 import android.content.res.Resources;
 import android.graphics.Bitmap;
 import android.support.annotation.DrawableRes;
-import android.support.graphics.drawable.AnimatedVectorDrawableCompat;
 import android.support.v4.graphics.drawable.RoundedBitmapDrawable;
 import android.support.v4.graphics.drawable.RoundedBitmapDrawableFactory;
 import android.support.v7.content.res.AppCompatResources;
@@ -19,10 +17,10 @@ import android.widget.ImageView;
 import android.widget.TextView;
 
 import org.chromium.chrome.R;
-import org.chromium.chrome.browser.download.DownloadUtils;
 import org.chromium.chrome.browser.download.home.list.ListItem;
 import org.chromium.chrome.browser.download.home.list.ListPropertyModel;
 import org.chromium.chrome.browser.download.home.list.UiUtils;
+import org.chromium.chrome.browser.download.home.view.SelectionView;
 import org.chromium.chrome.browser.widget.TintedImageView;
 import org.chromium.components.offline_items_collection.OfflineItemVisuals;
 
@@ -31,9 +29,6 @@ import org.chromium.components.offline_items_collection.OfflineItemVisuals;
 public class GenericViewHolder extends ThumbnailAwareViewHolder {
     private static final int INVALID_ID = -1;
 
-    private final ColorStateList mCheckedIconForegroundColorList;
-    private final AnimatedVectorDrawableCompat mCheckDrawable;
-
     private final TextView mTitle;
     private final TextView mCaption;
     private final TintedImageView mThumbnailView;
@@ -61,11 +56,6 @@ public class GenericViewHolder extends ThumbnailAwareViewHolder {
         mTitle = (TextView) itemView.findViewById(R.id.title);
         mCaption = (TextView) itemView.findViewById(R.id.caption);
         mThumbnailView = (TintedImageView) itemView.findViewById(R.id.thumbnail);
-
-        mCheckDrawable = AnimatedVectorDrawableCompat.create(
-                itemView.getContext(), R.drawable.ic_check_googblue_24dp_animated);
-        mCheckedIconForegroundColorList =
-                DownloadUtils.getIconForegroundColorList(itemView.getContext());
     }
 
     // ListItemViewHolder implementation.
@@ -89,18 +79,9 @@ public class GenericViewHolder extends ThumbnailAwareViewHolder {
 
     private void updateThumbnailView() {
         Resources resources = itemView.getContext().getResources();
-
-        // TODO(shaktisahu): Pass the appropriate value of selection.
-        boolean selected = false;
-        if (selected) {
-            mThumbnailView.setBackgroundResource(R.drawable.list_item_icon_modern_bg);
-            mThumbnailView.getBackground().setLevel(
-                    resources.getInteger(R.integer.list_item_level_selected));
-
-            mThumbnailView.setImageDrawable(mCheckDrawable);
-            mThumbnailView.setTint(mCheckedIconForegroundColorList);
-            mCheckDrawable.start();
-        } else if (mThumbnailBitmap != null) {
+        SelectionView selectionView = itemView.findViewById(R.id.selection);
+        mThumbnailView.setVisibility(selectionView.isSelected() ? View.GONE : View.VISIBLE);
+        if (mThumbnailBitmap != null) {
             assert !mThumbnailBitmap.isRecycled();
 
             mThumbnailView.setBackground(null);

chrome/android/java/src/org/chromium/chrome/browser/download/home/list/holder/ImageViewHolder.java

@@ -4,27 +4,18 @@
 
 package org.chromium.chrome.browser.download.home.list.holder;
 
-import android.content.res.ColorStateList;
-import android.content.res.Resources;
-import android.support.graphics.drawable.AnimatedVectorDrawableCompat;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 
 import org.chromium.chrome.R;
-import org.chromium.chrome.browser.download.DownloadUtils;
 import org.chromium.chrome.browser.download.home.list.ListItem;
 import org.chromium.chrome.browser.download.home.list.ListPropertyModel;
-import org.chromium.chrome.browser.widget.TintedImageView;
 import org.chromium.components.offline_items_collection.OfflineItemVisuals;
 
 /** A {@link RecyclerView.ViewHolder} specifically meant to display an image {@code OfflineItem}. */
 public class ImageViewHolder extends ThumbnailAwareViewHolder {
-    private final TintedImageView mSelectionImage;
-    private final ColorStateList mCheckedIconForegroundColorList;
-    private final AnimatedVectorDrawableCompat mCheckDrawable;
-
     public static org.chromium.chrome.browser.download.home.list.holder.ImageViewHolder create(
             ViewGroup parent) {
         View view = LayoutInflater.from(parent.getContext())
@@ -37,11 +28,6 @@ public class ImageViewHolder extends ThumbnailAwareViewHolder {
 
     public ImageViewHolder(View view, int thumbnailSizePx) {
         super(view, thumbnailSizePx, thumbnailSizePx);
-        mCheckDrawable = AnimatedVectorDrawableCompat.create(
-                itemView.getContext(), R.drawable.ic_check_googblue_24dp_animated);
-        mCheckedIconForegroundColorList =
-                DownloadUtils.getIconForegroundColorList(itemView.getContext());
-        mSelectionImage = (TintedImageView) itemView.findViewById(R.id.selection);
     }
 
     // ThumbnailAwareViewHolder implementation.
@@ -51,39 +37,10 @@ public class ImageViewHolder extends ThumbnailAwareViewHolder {
         ListItem.OfflineItemListItem offlineItem = (ListItem.OfflineItemListItem) item;
         View imageView = itemView.findViewById(R.id.thumbnail);
         imageView.setContentDescription(offlineItem.item.title);
-        updateImageView();
     }
 
     @Override
     void onVisualsChanged(ImageView view, OfflineItemVisuals visuals) {
         view.setImageBitmap(visuals == null ? null : visuals.icon);
-        updateImageView();
-    }
-
-    protected void updateImageView() {
-        Resources resources = itemView.getContext().getResources();
-        // TODO(shaktisahu): Pass the appropriate value of selection.
-        boolean selected = false;
-        boolean selectionModeActive = false;
-        if (selected) {
-            mSelectionImage.setVisibility(View.VISIBLE);
-            mSelectionImage.setBackgroundResource(R.drawable.list_item_icon_modern_bg);
-            mSelectionImage.getBackground().setLevel(
-                    resources.getInteger(R.integer.list_item_level_selected));
-
-            mSelectionImage.setImageDrawable(mCheckDrawable);
-            mSelectionImage.setTint(mCheckedIconForegroundColorList);
-            mCheckDrawable.start();
-        } else if (selectionModeActive) {
-            mSelectionImage.setVisibility(View.VISIBLE);
-            mSelectionImage.setBackground(null);
-            mSelectionImage.setTint(null);
-
-            mSelectionImage.setImageResource(R.drawable.download_circular_selector_transparent);
-        } else {
-            mSelectionImage.setBackground(null);
-            mSelectionImage.setTint(null);
-            mSelectionImage.setVisibility(View.GONE);
-        }
     }
 }

chrome/android/java/src/org/chromium/chrome/browser/download/home/list/holder/MoreButtonViewHolder.java

@@ -37,6 +37,7 @@ class MoreButtonViewHolder extends ListItemViewHolder implements ListMenuButton.
         ListItem.OfflineItemListItem offlineItem = (ListItem.OfflineItemListItem) item;
         mShareCallback = () -> properties.getShareCallback().onResult(offlineItem.item);
         mDeleteCallback = () -> properties.getRemoveCallback().onResult(offlineItem.item);
+        if (mMore != null) mMore.setClickable(!properties.getSelectionModeActive());
     }
 
     // ListMenuButton.Delegate implementation.

chrome/android/java/src/org/chromium/chrome/browser/download/home/list/holder/ThumbnailAwareViewHolder.java

@@ -12,6 +12,7 @@ import android.widget.ImageView;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.download.home.list.ListItem;
 import org.chromium.chrome.browser.download.home.list.ListPropertyModel;
+import org.chromium.chrome.browser.download.home.view.SelectionView;
 import org.chromium.components.offline_items_collection.ContentId;
 import org.chromium.components.offline_items_collection.OfflineItem;
 import org.chromium.components.offline_items_collection.OfflineItemVisuals;
@@ -22,6 +23,7 @@ import org.chromium.components.offline_items_collection.VisualsCallback;
  */
 abstract class ThumbnailAwareViewHolder extends MoreButtonViewHolder implements VisualsCallback {
     private final ImageView mThumbnail;
+    private final SelectionView mSelectionView;
 
     /**
      * The {@link ContentId} of the associated thumbnail/request if any.
@@ -58,6 +60,7 @@ abstract class ThumbnailAwareViewHolder extends MoreButtonViewHolder implements
         super(view);
 
         mThumbnail = (ImageView) view.findViewById(R.id.thumbnail);
+        mSelectionView = itemView.findViewById(R.id.selection);
         mWidthPx = thumbnailWidthPx;
         mHeightPx = thumbnailHeightPx;
     }
@@ -73,9 +76,27 @@ abstract class ThumbnailAwareViewHolder extends MoreButtonViewHolder implements
         OfflineItem offlineItem = ((ListItem.OfflineItemListItem) item).item;
 
         // If we're rebinding the same item, ignore the bind.
-        if (offlineItem.id.equals(mId)) return;
-
-        // TODO(shaktisahu): Add callbacks for selection and open.
+        if (offlineItem.id.equals(mId) && !selectionStateHasChanged(properties, item)) {
+            return;
+        }
+
+        if (mSelectionView != null) {
+            mSelectionView.setSelectionState(
+                    item.selected, properties.getSelectionModeActive(), item.showSelectedAnimation);
+        }
+
+        itemView.setOnLongClickListener(v -> {
+            properties.getSelectionCallback().onResult(item);
+            return true;
+        });
+
+        itemView.setOnClickListener(v -> {
+            if (mSelectionView != null && mSelectionView.isInSelectionMode()) {
+                properties.getSelectionCallback().onResult(item);
+            } else {
+                properties.getOpenCallback().onResult(offlineItem);
+            }
+        });
 
         // Clear any associated bitmap from the thumbnail.
         if (mId != null) onVisualsChanged(mThumbnail, null);
@@ -92,6 +113,13 @@ abstract class ThumbnailAwareViewHolder extends MoreButtonViewHolder implements
         if (!mIsRequesting) mCancellable = null;
     }
 
+    private boolean selectionStateHasChanged(ListPropertyModel properties, ListItem item) {
+        if (mSelectionView == null) return false;
+
+        return mSelectionView.isSelected() != item.selected
+                || mSelectionView.isInSelectionMode() != properties.getSelectionModeActive();
+    }
+
     // VisualsCallback implementation.
     @Override
     public void onVisualsAvailable(ContentId id, OfflineItemVisuals visuals) {

chrome/android/java/src/org/chromium/chrome/browser/download/home/view/SelectionView.java

+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.download.home.view;
+
+import android.content.Context;
+import android.support.graphics.drawable.AnimatedVectorDrawableCompat;
+import android.util.AttributeSet;
+import android.view.LayoutInflater;
+import android.widget.FrameLayout;
+
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.widget.TintedImageView;
+
+/**
+ * A helper UI widget that provides visual feedback when the selection state of the underlying view
+ * is changed. The widget represents three distinct states : selected, in selection mode and not
+ * selected. The caller can define the UI behavior at each of these states by subclassing this view.
+ */
+public class SelectionView extends FrameLayout {
+    private final TintedImageView mCheck;
+    private final TintedImageView mCircle;
+    private final AnimatedVectorDrawableCompat mCheckDrawable;
+
+    private boolean mIsSelected;
+    private boolean mInSelectionMode;
+    private boolean mShowSelectedAnimation;
+
+    /** Constructor for inflating from XML. */
+    public SelectionView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        LayoutInflater.from(context).inflate(R.layout.list_selection_handle_view, this, true);
+        mCheck = (TintedImageView) findViewById(R.id.check);
+        mCircle = (TintedImageView) findViewById(R.id.circle);
+        mCheckDrawable = AnimatedVectorDrawableCompat.create(
+                context, R.drawable.ic_check_googblue_24dp_animated);
+    }
+
+    @Override
+    public boolean isSelected() {
+        return mIsSelected;
+    }
+
+    /** @return Whether the selection mode is currently active. */
+    public boolean isInSelectionMode() {
+        return mInSelectionMode;
+    }
+
+    /**
+     * Called to inform the view about its current selection state.
+     * @param selected Whether the item is currently selected.
+     * @param inSelectionMode Whether we are currently in active selection mode.
+     * @param showSelectedAnimation Whether the item was recently selected from an unselected state
+     * and animation should be shown.
+     */
+    public void setSelectionState(
+            boolean selected, boolean inSelectionMode, boolean showSelectedAnimation) {
+        mIsSelected = selected;
+        mInSelectionMode = inSelectionMode;
+        mShowSelectedAnimation = showSelectedAnimation;
+        updateView();
+    }
+
+    private void updateView() {
+        if (mIsSelected) {
+            mCheck.setVisibility(VISIBLE);
+            mCircle.setVisibility(GONE);
+
+            mCheck.setImageDrawable(mCheckDrawable);
+            mCheck.getBackground().setLevel(
+                    getResources().getInteger(R.integer.list_item_level_selected));
+            if (mShowSelectedAnimation) mCheckDrawable.start();
+        } else if (mInSelectionMode) {
+            mCheck.setVisibility(GONE);
+            mCircle.setVisibility(VISIBLE);
+        } else {
+            mCheck.setVisibility(GONE);
+            mCircle.setVisibility(GONE);
+        }
+    }
+}

chrome/android/java_sources.gni

@@ -500,6 +500,7 @@ chrome_java_sources = [
   "java/src/org/chromium/chrome/browser/download/home/toolbar/DownloadHomeToolbar.java",
   "java/src/org/chromium/chrome/browser/download/home/snackbars/DeleteUndoCoordinator.java",
   "java/src/org/chromium/chrome/browser/download/home/snackbars/UndoUiUtils.java",
+  "java/src/org/chromium/chrome/browser/download/home/view/SelectionView.java",
   "java/src/org/chromium/chrome/browser/download/items/DownloadBlockedOfflineContentProvider.java",
   "java/src/org/chromium/chrome/browser/download/items/OfflineContentAggregatorFactory.java",
   "java/src/org/chromium/chrome/browser/download/items/OfflineContentAggregatorNotificationBridgeUi.java",