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/*
* Copyright (C) 2016 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.calculator2;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import static android.view.View.MeasureSpec.UNSPECIFIED;
import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
public class CalculatorScrollView extends HorizontalScrollView {
public CalculatorScrollView(Context context) {
this(context, null /* attrs */);
}
public CalculatorScrollView(Context context, AttributeSet attrs) {
this(context, attrs, 0 /* defStyleAttr */);
}
public CalculatorScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
private static int getChildMeasureSpecCompat(int spec, int padding, int childDimension) {
if (MeasureSpec.getMode(spec) == UNSPECIFIED
&& (childDimension == MATCH_PARENT || childDimension == WRAP_CONTENT)) {
final int size = Math.max(0, MeasureSpec.getSize(spec) - padding);
return MeasureSpec.makeMeasureSpec(size, UNSPECIFIED);
}
return ViewGroup.getChildMeasureSpec(spec, padding, childDimension);
}
@Override
protected void measureChild(View child, int parentWidthMeasureSpec,
int parentHeightMeasureSpec) {
// Allow child to be as wide as they want.
parentWidthMeasureSpec = MeasureSpec.makeMeasureSpec(
MeasureSpec.getSize(parentWidthMeasureSpec), UNSPECIFIED);
final ViewGroup.LayoutParams lp = child.getLayoutParams();
final int childWidthMeasureSpec = getChildMeasureSpecCompat(parentWidthMeasureSpec,
0 /* padding */, lp.width);
final int childHeightMeasureSpec = getChildMeasureSpecCompat(parentHeightMeasureSpec,
getPaddingTop() + getPaddingBottom(), lp.height);
child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
}
@Override
protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed,
int parentHeightMeasureSpec, int heightUsed) {
// Allow child to be as wide as they want.
parentWidthMeasureSpec = MeasureSpec.makeMeasureSpec(
MeasureSpec.getSize(parentWidthMeasureSpec), UNSPECIFIED);
final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
final int childWidthMeasureSpec = getChildMeasureSpecCompat(parentWidthMeasureSpec,
lp.leftMargin + lp.rightMargin, lp.width);
final int childHeightMeasureSpec = getChildMeasureSpecCompat(parentHeightMeasureSpec,
getPaddingTop() + getPaddingBottom() + lp.topMargin + lp.bottomMargin, lp.height);
child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
}
}
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