6/n: Add camera preview to FaceEnrollEnrolling

Bug: 112005540

Test: manual
Change-Id: Ie4f810dffecdec9731e20d5756854d9c9f420f4b

src/com/android/settings/biometrics/face/FaceSquareFrameLayout.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.settings.biometrics.face;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.widget.FrameLayout;
+
+/**
+ * Square layout that sets the height to be the same as width.
+ */
+public class FaceSquareFrameLayout extends FrameLayout {
+
+    public FaceSquareFrameLayout(Context context) {
+        super(context);
+    }
+
+    public FaceSquareFrameLayout(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public FaceSquareFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    public FaceSquareFrameLayout(Context context, AttributeSet attrs, int defStyleAttr,
+            int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    @Override
+    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        // Don't call super, manually set their size below
+        int size = MeasureSpec.getSize(widthMeasureSpec);
+
+        // Set this frame layout to be a square
+        setMeasuredDimension(size, size);
+
+        // Set the children to be the same size (square) as well
+        final int numChildren = getChildCount();
+        for (int i = 0; i < numChildren; i++) {
+            int spec = MeasureSpec.makeMeasureSpec(size, MeasureSpec.EXACTLY);
+            this.getChildAt(i).measure(spec, spec);
+        }
+    }
+}