AspectRatioFrameLayout.java

/*
 * Copyright 2016 Flipkart Internet Pvt. Ltd.
 *
 * 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.flipkart.android.proteus.view.custom;

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;
import android.widget.FrameLayout;

/**
 * Created by kiran.kumar on 13/05/14.
 */
public class AspectRatioFrameLayout extends FrameLayout {

    private int mAspectRatioWidth;
    private int mAspectRatioHeight;

    public AspectRatioFrameLayout(Context context) {
        super(context);
    }

    public AspectRatioFrameLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public AspectRatioFrameLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public AspectRatioFrameLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (mAspectRatioHeight > 0 && mAspectRatioWidth > 0) {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);

            int originalWidth = getMeasuredWidth();

            int originalHeight = getMeasuredHeight();

            int finalWidth, finalHeight;

            if (originalHeight == 0) {
                finalHeight = originalWidth * mAspectRatioHeight / mAspectRatioWidth;
                finalWidth = originalWidth;
            } else if (originalWidth == 0) {
                finalWidth = originalHeight * mAspectRatioWidth / mAspectRatioHeight;
                finalHeight = originalHeight;
            } else {
                finalHeight = originalHeight;
                finalWidth = originalWidth;
            }


            super.onMeasure(
                    MeasureSpec.makeMeasureSpec(finalWidth, MeasureSpec.EXACTLY),
                    MeasureSpec.makeMeasureSpec(finalHeight, MeasureSpec.EXACTLY));
        } else {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }

    public void setAspectRatioWidth(int mAspectRatioWidth) {
        this.mAspectRatioWidth = mAspectRatioWidth;
    }

    public void setAspectRatioHeight(int mAspectRatioHeight) {
        this.mAspectRatioHeight = mAspectRatioHeight;
    }
}