Make FadingEdgeScrollView more generic

chrome/android/java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestUI.java

 // 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.payments.ui;
 
 import static org.chromium.chrome.browser.payments.ui.PaymentRequestSection.EDIT_BUTTON_GONE;
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
@@ skipping 19 matching lines @@
 import android.view.Gravity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.View.OnLayoutChangeListener;
 import android.view.ViewGroup;
 import android.view.ViewGroup.LayoutParams;
 import android.view.Window;
 import android.widget.Button;
 import android.widget.FrameLayout;
 import android.widget.LinearLayout;
-import android.widget.ScrollView;
 import android.widget.TextView;
 
 import org.chromium.base.ApiCompatibilityUtils;
 import org.chromium.base.Callback;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.payments.ShippingStrings;
 import org.chromium.chrome.browser.payments.ui.PaymentRequestSection.ExtraTextsSection;
 import org.chromium.chrome.browser.payments.ui.PaymentRequestSection.LineItemBreakdownSection;
 import org.chromium.chrome.browser.payments.ui.PaymentRequestSection.OptionSection;
 import org.chromium.chrome.browser.payments.ui.PaymentRequestSection.SectionSeparator;
 import org.chromium.chrome.browser.widget.AlwaysDismissedDialog;
+import org.chromium.chrome.browser.widget.FadingEdgeScrollView;
 import org.chromium.chrome.browser.widget.animation.AnimatorProperties;
 import org.chromium.chrome.browser.widget.animation.FocusAnimator;
 import org.chromium.components.signin.ChromeSigninController;
 import org.chromium.ui.text.NoUnderlineClickableSpan;
 import org.chromium.ui.text.SpanApplier;
 import org.chromium.ui.text.SpanApplier.SpanInfo;
 import org.chromium.ui.widget.TextViewWithClickableSpans;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ skipping 243 matching lines @@
 
     private final Dialog mDialog;
     private final EditorView mEditorView;
     private final EditorView mCardEditorView;
     private final ViewGroup mFullContainer;
     private final ViewGroup mRequestView;
     private final PaymentRequestUiErrorView mErrorView;
     private final Callback<PaymentInformation> mUpdateSectionsCallback;
     private final ShippingStrings mShippingStrings;
 
-    private ScrollView mPaymentContainer;
+    private FadingEdgeScrollView mPaymentContainer;
     private LinearLayout mPaymentContainerLayout;
     private ViewGroup mBottomBar;
     private Button mEditButton;
     private Button mPayButton;
     private View mCloseButton;
     private View mSpinnyLayout;
 
     private LineItemBreakdownSection mOrderSummarySection;
     private ExtraTextsSection mShippingSummarySection;
     private OptionSection mShippingAddressSection;
@@ skipping 220 matching lines @@
         mCloseButton = mRequestView.findViewById(R.id.close_button);
         mCloseButton.setOnClickListener(this);
         mBottomBar = (ViewGroup) mRequestView.findViewById(R.id.bottom_bar);
         mPayButton = (Button) mBottomBar.findViewById(R.id.button_primary);
         mPayButton.setOnClickListener(this);
         mEditButton = (Button) mBottomBar.findViewById(R.id.button_secondary);
         mEditButton.setOnClickListener(this);
 
         // Create all the possible sections.
         mSectionSeparators = new ArrayList<>();
-        mPaymentContainer = (ScrollView) mRequestView.findViewById(R.id.option_container);
+        mPaymentContainer = (FadingEdgeScrollView) mRequestView.findViewById(R.id.option_container);
         mPaymentContainerLayout =
                 (LinearLayout) mRequestView.findViewById(R.id.payment_container_layout);
         mOrderSummarySection = new LineItemBreakdownSection(context,
                 context.getString(R.string.payments_order_summary_label), this,
                 context.getString(R.string.payments_updated_label));
         mShippingSummarySection = new ExtraTextsSection(
                 context, context.getString(mShippingStrings.getSummaryLabel()), this);
         mShippingAddressSection = new OptionSection(
                 context, context.getString(mShippingStrings.getAddressLabel()), this);
         mShippingOptionSection = new OptionSection(
@@ skipping 429 matching lines @@
                         new LinearLayout.LayoutParams(
                                 LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
                 mSectionSeparators.add(
                         new SectionSeparator(mPaymentContainerLayout, summaryIndex + 1));
                 mPaymentContainerLayout.addView(mShippingOptionSection, summaryIndex + 2,
                         new LinearLayout.LayoutParams(
                                 LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
             }
 
             // New separators appear at the top and bottom of the list.
-            mSectionSeparators.add(new SectionSeparator(mPaymentContainerLayout, 0));
+            mPaymentContainer.setEdgeVisibility(
+                    FadingEdgeScrollView.DRAW_HARD_EDGE, FadingEdgeScrollView.DRAW_FADING_EDGE);
             mSectionSeparators.add(new SectionSeparator(mPaymentContainerLayout, -1));
 
             // Add a link to Autofill settings.
             addCardAndAddressOptionsSettingsView(mPaymentContainerLayout);
 
             // Expand all the dividers.
             for (int i = 0; i < mSectionSeparators.size(); i++) mSectionSeparators.get(i).expand();
             mPaymentContainerLayout.requestLayout();
 
             // Switch the 'edit' button to a 'cancel' button.
@@ skipping 391 matching lines @@
             sObserverForTest.onPaymentRequestReadyForInput(this);
         }
     }
 
     private void notifySelectionChecked() {
         if (sObserverForTest != null) {
             sObserverForTest.onPaymentRequestSelectionChecked(this);
         }
     }
 }