[Payments] Add UI elements to secure branding for payments

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

+// Copyright 2017 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 android.content.Context;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.View.MeasureSpec;
+import android.view.ViewGroup.MarginLayoutParams;
+import android.widget.LinearLayout;
+
+import org.chromium.chrome.R;
+
+/** This class represents a bar to display at the bottom of the payment request UI. */
+public class PaymentRequestBottomBar extends LinearLayout {
+    private View mLogoWithName;
+    private View mLogo;
+    private View mPrimaryButton;
+    private View mSecondaryButton;
+    private View mSpace;
+
+    /** Constructor for when the PaymentRequestBottomBar is inflated from XML. */
+    public PaymentRequestBottomBar(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        super.onFinishInflate();
+
+        mLogoWithName = findViewById(R.id.logo_name);
+        mLogo = findViewById(R.id.logo);
+        mPrimaryButton = findViewById(R.id.button_primary);
+        mSecondaryButton = findViewById(R.id.button_secondary);
+        mSpace = findViewById(R.id.space);
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        // Views layout_width must be set to match_parent.
+        assert MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY;
+
+        measureChild(mLogoWithName, widthMeasureSpec, heightMeasureSpec);
+        int logoWithNameWidth = mLogoWithName.getMeasuredWidth();
+
+        measureChild(mLogo, widthMeasureSpec, heightMeasureSpec);
+        int logoWidth = mLogo.getMeasuredWidth();
+
+        measureChild(mPrimaryButton, widthMeasureSpec, heightMeasureSpec);
+        int primaryButtonWidth = mPrimaryButton.getMeasuredWidth();
+
+        measureChild(mSecondaryButton, widthMeasureSpec, heightMeasureSpec);
+        int secondaryButtonWidth = mSecondaryButton.getMeasuredWidth();
+
+        MarginLayoutParams layoutParams = (MarginLayoutParams) getLayoutParams();
+        int totalWidthWithoutLogo = primaryButtonWidth + secondaryButtonWidth + getPaddingLeft()
+                + getPaddingRight() + layoutParams.leftMargin + layoutParams.rightMargin;
+
+        int blankSpaceWidth;
+        int maxTotalWidth = MeasureSpec.getSize(widthMeasureSpec);
+        if (totalWidthWithoutLogo + logoWithNameWidth <= maxTotalWidth) {
+            mLogo.setVisibility(View.GONE);
+            mLogoWithName.setVisibility(View.VISIBLE);
+            blankSpaceWidth = maxTotalWidth - totalWidthWithoutLogo - logoWithNameWidth;
+        } else if (totalWidthWithoutLogo + logoWidth <= maxTotalWidth) {
+            mLogo.setVisibility(View.VISIBLE);
+            mLogoWithName.setVisibility(View.GONE);
+            blankSpaceWidth = maxTotalWidth - totalWidthWithoutLogo - logoWidth;
+        } else {
+            mLogo.setVisibility(View.GONE);
+            mLogoWithName.setVisibility(View.GONE);
+            blankSpaceWidth = maxTotalWidth < totalWidthWithoutLogo
+                    ? 0
+                    : maxTotalWidth - totalWidthWithoutLogo;
+            assert maxTotalWidth >= totalWidthWithoutLogo
+                    : "Screen width is expected to fit the two buttons at least.";
+        }
+
+        // Sets the blank space width.
+        mSpace.getLayoutParams().width = blankSpaceWidth;
+        measureChild(mSpace, MeasureSpec.makeMeasureSpec(blankSpaceWidth, MeasureSpec.EXACTLY),
+                heightMeasureSpec);
+
+        // Note that mLogoWithName and mLogo must have the same height.
+        int maxMeasuredHeight = Math.max(mLogoWithName.getMeasuredHeight(),
+                Math.max(mPrimaryButton.getMeasuredHeight(), mSecondaryButton.getMeasuredHeight()));
+        int totalHeightWithPadding = maxMeasuredHeight + getPaddingTop() + getPaddingBottom()
+                + layoutParams.topMargin + layoutParams.bottomMargin;
+        int measuredHeightSpec =
+                MeasureSpec.makeMeasureSpec(totalHeightWithPadding, MeasureSpec.EXACTLY);
+        setMeasuredDimension(widthMeasureSpec, measuredHeightSpec);
+    }
+}