| /* |
| * Copyright (C) 2021 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.example.android.apis.view; |
| |
| import android.content.Context; |
| import android.content.res.TypedArray; |
| import android.util.AttributeSet; |
| import android.util.Rational; |
| import android.widget.ImageView; |
| |
| import com.example.android.apis.R; |
| |
| /** |
| * Extended {@link ImageView} that keeps fixed aspect ratio (specified in layout file) when |
| * one of the dimension is in exact while the other one in wrap_content size mode. |
| */ |
| public class FixedAspectRatioImageView extends ImageView { |
| private Rational mAspectRatio; |
| |
| public FixedAspectRatioImageView(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| final TypedArray a = context.getTheme().obtainStyledAttributes(attrs, |
| R.styleable.FixedAspectRatioImageView, 0, 0); |
| try { |
| mAspectRatio = Rational.parseRational( |
| a.getString(R.styleable.FixedAspectRatioImageView_aspectRatio)); |
| } finally { |
| a.recycle(); |
| } |
| } |
| |
| public void setAspectRatio(Rational aspectRatio) { |
| if (!mAspectRatio.equals(aspectRatio)) { |
| mAspectRatio = aspectRatio; |
| requestLayout(); |
| } |
| } |
| |
| @Override |
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| final int width, height; |
| if (MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY |
| && MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.EXACTLY) { |
| width = MeasureSpec.getSize(widthMeasureSpec); |
| height = MeasureSpec.getSize(heightMeasureSpec); |
| } else if (MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY) { |
| width = MeasureSpec.getSize(widthMeasureSpec); |
| height = (int) (width / mAspectRatio.floatValue()); |
| } else { |
| height = MeasureSpec.getSize(heightMeasureSpec); |
| width = (int) (height * mAspectRatio.floatValue()); |
| } |
| setMeasuredDimension(width, height); |
| } |
| } |