/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.calculator2;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.HorizontalScrollView;
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import static android.view.View.MeasureSpec.UNSPECIFIED;
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import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
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import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
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public class CalculatorScrollView extends HorizontalScrollView {
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public CalculatorScrollView(Context context) {
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this(context, null /* attrs */);
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}
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public CalculatorScrollView(Context context, AttributeSet attrs) {
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this(context, attrs, 0 /* defStyleAttr */);
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}
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public CalculatorScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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}
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private static int getChildMeasureSpecCompat(int spec, int padding, int childDimension) {
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if (MeasureSpec.getMode(spec) == UNSPECIFIED
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&& (childDimension == MATCH_PARENT || childDimension == WRAP_CONTENT)) {
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final int size = Math.max(0, MeasureSpec.getSize(spec) - padding);
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return MeasureSpec.makeMeasureSpec(size, UNSPECIFIED);
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}
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return ViewGroup.getChildMeasureSpec(spec, padding, childDimension);
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}
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@Override
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protected void measureChild(View child, int parentWidthMeasureSpec,
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int parentHeightMeasureSpec) {
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// Allow child to be as wide as they want.
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parentWidthMeasureSpec = MeasureSpec.makeMeasureSpec(
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MeasureSpec.getSize(parentWidthMeasureSpec), UNSPECIFIED);
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final ViewGroup.LayoutParams lp = child.getLayoutParams();
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final int childWidthMeasureSpec = getChildMeasureSpecCompat(parentWidthMeasureSpec,
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0 /* padding */, lp.width);
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final int childHeightMeasureSpec = getChildMeasureSpecCompat(parentHeightMeasureSpec,
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getPaddingTop() + getPaddingBottom(), lp.height);
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child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
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}
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@Override
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protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed,
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int parentHeightMeasureSpec, int heightUsed) {
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// Allow child to be as wide as they want.
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parentWidthMeasureSpec = MeasureSpec.makeMeasureSpec(
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MeasureSpec.getSize(parentWidthMeasureSpec), UNSPECIFIED);
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final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
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final int childWidthMeasureSpec = getChildMeasureSpecCompat(parentWidthMeasureSpec,
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lp.leftMargin + lp.rightMargin, lp.width);
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final int childHeightMeasureSpec = getChildMeasureSpecCompat(parentHeightMeasureSpec,
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getPaddingTop() + getPaddingBottom() + lp.topMargin + lp.bottomMargin, lp.height);
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child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
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}
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}
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