/*
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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"); you may not use this file
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* except in compliance with the License. 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 distributed under the
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* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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package com.android.settings.widget;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.util.AttributeSet;
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import android.widget.FrameLayout;
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import androidx.annotation.VisibleForTesting;
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import com.android.settings.R;
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/**
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* A {@link FrameLayout} with customizable aspect ratio.
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* This is used to avoid dynamically calculating the height for the frame. Default aspect
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* ratio will be 1 if none is set in layout attribute.
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*/
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public final class AspectRatioFrameLayout extends FrameLayout {
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private static final float ASPECT_RATIO_CHANGE_THREASHOLD = 0.01f;
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@VisibleForTesting
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float mAspectRatio = 1.0f;
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public AspectRatioFrameLayout(Context context) {
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this(context, null);
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}
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public AspectRatioFrameLayout(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public AspectRatioFrameLayout(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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if (attrs != null) {
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TypedArray array =
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context.obtainStyledAttributes(attrs, R.styleable.AspectRatioFrameLayout);
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mAspectRatio = array.getFloat(
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R.styleable.AspectRatioFrameLayout_aspectRatio, 1.0f);
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array.recycle();
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}
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}
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public void setAspectRatio(float aspectRadio) {
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mAspectRatio = aspectRadio;
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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int width = getMeasuredWidth();
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int height = getMeasuredHeight();
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if (width == 0 || height == 0) {
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return;
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}
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final float viewAspectRatio = (float) width / height;
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final float aspectRatioDiff = mAspectRatio - viewAspectRatio;
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if (Math.abs(aspectRatioDiff) <= ASPECT_RATIO_CHANGE_THREASHOLD) {
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// Close enough, skip.
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return;
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}
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width = (int) (height * mAspectRatio);
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super.onMeasure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
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MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
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}
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}
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