Extract a DataSource interface for items shown in a status card.

chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SigninPromoItem.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SigninPromoItem.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SigninPromoItem.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SigninPromoItem.java
deleted file mode 100644
index 7003be835c4bf393243af3e4fad9e10337591ffd..0000000000000000000000000000000000000000
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SigninPromoItem.java
+++ /dev/null
@@ -1,147 +0,0 @@
-// Copyright 2016 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.ntp.cards;
-
-import android.content.Context;
-import android.support.annotation.DrawableRes;
-import android.support.v7.widget.RecyclerView;
-
-import org.chromium.base.ContextUtils;
-import org.chromium.base.metrics.RecordUserAction;
-import org.chromium.chrome.R;
-import org.chromium.chrome.browser.ntp.UiConfig;
-import org.chromium.chrome.browser.preferences.ChromePreferenceManager;
-import org.chromium.chrome.browser.signin.AccountSigninActivity;
-import org.chromium.chrome.browser.signin.SigninAccessPoint;
-import org.chromium.chrome.browser.signin.SigninManager;
-
-import java.util.Collections;
-import java.util.List;
-
-/**
- * Shows a card prompting the user to sign in. This item is also an {@link ItemGroup}, and calling
- * {@link #hide()} or {@link #maybeShow()} will control its visibility.
- */
-public class SigninPromoItem extends StatusItem implements ItemGroup {
-    private final List<NewTabPageItem> mItems = Collections.<NewTabPageItem>singletonList(this);
-    private Observer mChangeObserver;
-
-    /**
-     * Whether the promo should be visible, according to the parent object.
-     *
-     * The {@link NewTabPageAdapter} calls to {@link #maybeShow()} and {@link #hide()} modify this
-     * when the sign in status changes.
-     */
-    private boolean mVisible;
-
-    /**
-     * Whether the user has seen the promo and dismissed it at some point. When this is set,
-     * the promo will never be shown.
-     */
-    private boolean mDismissed;
-
-    public SigninPromoItem() {
-        super(org.chromium.chrome.R.string.snippets_disabled_generic_prompt,
-                org.chromium.chrome.R.string.snippets_disabled_signed_out_instructions,
-                org.chromium.chrome.R.string.sign_in_button);
-        mDismissed = ChromePreferenceManager.getInstance(ContextUtils.getApplicationContext())
-                             .getNewTabPageSigninPromoDismissed();
-        mVisible = !SigninManager.get(ContextUtils.getApplicationContext()).isSignedInOnNative();
-    }
-
-    @Override
-    public List<NewTabPageItem> getItems() {
-        return isShown() ? mItems : Collections.<NewTabPageItem>emptyList();
-    }
-
-    @Override
-    public int getType() {
-        return NewTabPageItem.VIEW_TYPE_PROMO;
-    }
-
-    @Override
-    protected void performAction(Context context) {
-        AccountSigninActivity.startIfAllowed(context, SigninAccessPoint.NTP_CONTENT_SUGGESTIONS);
-    }
-
-    /** Sets the {@link Observer} that will be notified when the visibility of the item changes. */
-    public void setObserver(Observer changeObserver) {
-        assert mChangeObserver == null;
-        this.mChangeObserver = changeObserver;
-    }
-
-    public boolean isShown() {
-        return !mDismissed && mVisible;
-    }
-
-    /** Attempts to show the sign in promo. If the user dismissed it before, it will not be shown.*/
-    public void maybeShow() {
-        if (mVisible) return;
-        mVisible = true;
-
-        if (mDismissed) return;
-
-        RecordUserAction.record("Signin_Impression_FromNTPContentSuggestions");
-        mChangeObserver.onItemRangeInserted(this, 0, 1);
-    }
-
-    /** Hides the sign in promo. */
-    public void hide() {
-        if (!mVisible) return;
-        mVisible = false;
-
-        if (mDismissed) return;
-
-        mChangeObserver.onItemRangeRemoved(this, 0, 1);
-    }
-
-    /** Hides the sign in promo and sets a preference to make sure it is not shown again. */
-    public void dismiss() {
-        hide();
-        mDismissed = true;
-        ChromePreferenceManager.getInstance(ContextUtils.getApplicationContext())
-                .setNewTabPageSigninPromoDismissed(true);
-    }
-
-    /**
-     * View Holder for {@link SigninPromoItem}.
-     */
-    public static class ViewHolder extends StatusCardViewHolder {
-        private final int mSeparationSpaceSize;
-
-        public ViewHolder(NewTabPageRecyclerView parent, UiConfig config) {
-            super(parent, config);
-            mSeparationSpaceSize = parent.getResources().getDimensionPixelSize(
-                    R.dimen.ntp_sign_in_promo_margin_top);
-        }
-
-        @DrawableRes
-        @Override
-        protected int selectBackground(boolean hasCardAbove, boolean hasCardBelow) {
-            assert !hasCardBelow;
-            if (hasCardAbove) return R.drawable.ntp_signin_promo_card_bottom;
-            return R.drawable.ntp_signin_promo_card_single;
-        }
-
-        @Override
-        public void updateLayoutParams() {
-            super.updateLayoutParams();
-
-            if (getAdapterPosition() == RecyclerView.NO_POSITION) return;
-
-            @NewTabPageItem.ViewType
-            int precedingCardType =
-                    getRecyclerView().getAdapter().getItemViewType(getAdapterPosition() - 1);
-
-            // The sign in promo should stick to the articles of the preceding section, but have
-            // some space otherwise.
-            if (precedingCardType != NewTabPageItem.VIEW_TYPE_SNIPPET) {
-                getParams().topMargin = mSeparationSpaceSize;
-            } else {
-                getParams().topMargin = 0;
-            }
-        }
-    }
-}