Create PaymentUIsManager to take over PRImpl's UI logic

In order to reuse most of PaymentRequestImpl for WebLayer, to move the
business logic from PaymentRequestImpl to ComponentPaymentRequestImpl,
we need to put a clear cut between the UI logic and the business logic
within PaymentRequestImpl. So this CL is to create PaymentUIsManager to
take over the the UI logic of PRImpl.

Change:
* Move mUI into PaymentUIsManager and renaming as mPaymentRequestUI
* Move the PaymentUisShowStateReconciler into PaymentUIsManager

Bug: 1102522

Change-Id: I128a58c8a86c6325e408ad249571c45f127d44ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2299187
Commit-Queue: Liquan (Max) Gu <maxlg@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788782}

chrome/android/chrome_java_sources.gni

@@ -1289,6 +1289,7 @@ chrome_java_sources = [
   "java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestHeader.java",
   "java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestSection.java",
   "java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestUI.java",
+  "java/src/org/chromium/chrome/browser/payments/ui/PaymentUIsManager.java",
   "java/src/org/chromium/chrome/browser/payments/ui/SectionInformation.java",
   "java/src/org/chromium/chrome/browser/payments/ui/SectionUiUtils.java",
   "java/src/org/chromium/chrome/browser/payments/ui/ShoppingCart.java",

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

@@ -40,11 +40,11 @@ import org.chromium.chrome.browser.ChromeVersionInfo;
 import org.chromium.chrome.browser.autofill.prefeditor.EditorDialog;
 import org.chromium.chrome.browser.autofill.prefeditor.EditorObserverForTest;
 import org.chromium.chrome.browser.lifecycle.PauseResumeWithNativeObserver;
-import org.chromium.chrome.browser.payments.PaymentRequestImpl.PaymentUisShowStateReconciler;
 import org.chromium.chrome.browser.payments.ShippingStrings;
 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.payments.ui.PaymentUIsManager.PaymentUisShowStateReconciler;
 import org.chromium.chrome.browser.profiles.Profile;
 import org.chromium.chrome.browser.signin.IdentityServicesProvider;
 import org.chromium.components.autofill.EditableOption;

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

+// Copyright 2020 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 org.chromium.chrome.browser.payments.PaymentRequestImpl;
+
+/**
+ * This class manages all of the UIs related to payment. The UI logic of {@link PaymentRequestImpl}
+ * should be moved into this class.
+ */
+public class PaymentUIsManager {
+    private PaymentRequestUI mPaymentRequestUI;
+    private PaymentUisShowStateReconciler mPaymentUisShowStateReconciler;
+
+    /**
+     * This class is to coordinate the show state of a bottom sheet UI (either expandable payment
+     * handler or minimal UI) and the Payment Request UI so that these visibility rules are
+     * enforced:
+     * 1. At most one UI is shown at any moment in case the Payment Request UI obstructs the bottom
+     * sheet.
+     * 2. Bottom sheet is prioritized to show over Payment Request UI
+     */
+    public class PaymentUisShowStateReconciler {
+        // Whether the bottom sheet is showing.
+        private boolean mShowingBottomSheet;
+        // Whether to show the Payment Request UI when the bottom sheet is not being shown.
+        private boolean mShouldShowDialog;
+
+        /**
+         * Show the Payment Request UI dialog when the bottom sheet is hidden, i.e., if the bottom
+         * sheet hidden, show the dialog immediately; otherwise, show the dialog after the bottom
+         * sheet hides.
+         */
+        /* package */ void showPaymentRequestDialogWhenNoBottomSheet() {
+            mShouldShowDialog = true;
+            updatePaymentRequestDialogShowState();
+        }
+
+        /** Hide the Payment Request UI dialog. */
+        /* package */ void hidePaymentRequestDialog() {
+            mShouldShowDialog = false;
+            updatePaymentRequestDialogShowState();
+        }
+
+        /** A callback invoked when the Payment Request UI is closed. */
+        public void onPaymentRequestUiClosed() {
+            assert mPaymentRequestUI == null;
+            mShouldShowDialog = false;
+        }
+
+        /** A callback invoked when the bottom sheet is shown, to enforce the visibility rules. */
+        public void onBottomSheetShown() {
+            mShowingBottomSheet = true;
+            updatePaymentRequestDialogShowState();
+        }
+
+        /** A callback invoked when the bottom sheet is hidden, to enforce the visibility rules. */
+        public void onBottomSheetClosed() {
+            mShowingBottomSheet = false;
+            updatePaymentRequestDialogShowState();
+        }
+
+        private void updatePaymentRequestDialogShowState() {
+            if (mPaymentRequestUI == null) return;
+            mPaymentRequestUI.setVisible(!mShowingBottomSheet && mShouldShowDialog);
+        }
+    }
+
+    /** Create PaymentUIsManager. */
+    public PaymentUIsManager() {
+        mPaymentUisShowStateReconciler = new PaymentUisShowStateReconciler();
+    }
+
+    /** @return The PaymentRequestUI. */
+    public PaymentRequestUI getPaymentRequestUI() {
+        return mPaymentRequestUI;
+    }
+
+    /**
+     * Set the PaymentRequestUI.
+     * @param paymentRequestUI The PaymentRequestUI.
+     */
+    public void setPaymentRequestUI(PaymentRequestUI paymentRequestUI) {
+        mPaymentRequestUI = paymentRequestUI;
+    }
+
+    /** @return The PaymentUisShowStateReconciler. */
+    public PaymentUisShowStateReconciler getPaymentUisShowStateReconciler() {
+        return mPaymentUisShowStateReconciler;
+    }
+}