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/*
* Copyright (C) 2017 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.incallui.answer.impl;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.SurfaceView;
import android.view.View;
import com.android.dialer.common.Assert;
/**
* A SurfaceView that maintains its aspect ratio to be a desired target value.
*
* <p>The FixedAspectSurfaceView will not be able to maintain the requested aspect ratio if both the
* width and the height are exactly determined by the layout. To avoid this, ensure that either the
* height or the width is adjustable by the view; for example, by setting the layout parameters to
* be WRAP_CONTENT for the dimension that is best adjusted to maintain the aspect ratio.
*/
public class FixedAspectSurfaceView extends SurfaceView {
/** Desired width/height ratio */
private float mAspectRatio;
private final boolean scaleWidth;
private final boolean scaleHeight;
public FixedAspectSurfaceView(Context context, AttributeSet attrs) {
super(context, attrs);
// Get initial aspect ratio from custom attributes
TypedArray a =
context.getTheme().obtainStyledAttributes(attrs, R.styleable.FixedAspectSurfaceView, 0, 0);
scaleHeight = a.getBoolean(R.styleable.FixedAspectSurfaceView_scaleHeight, false);
scaleWidth = a.getBoolean(R.styleable.FixedAspectSurfaceView_scaleWidth, false);
Assert.checkArgument(scaleHeight != scaleWidth, "Must either scale width or height");
setAspectRatio(a.getFloat(R.styleable.FixedAspectSurfaceView_aspectRatio, 1.f));
a.recycle();
}
/**
* Set the desired aspect ratio for this view.
*
* @param aspect the desired width/height ratio in the current UI orientation. Must be a positive
* value.
*/
public void setAspectRatio(float aspect) {
Assert.checkArgument(aspect >= 0, "Aspect ratio must be positive");
mAspectRatio = aspect;
requestLayout();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
// Do the scaling
if (scaleWidth) {
width = (int) (height * mAspectRatio);
} else if (scaleHeight) {
height = (int) (width / mAspectRatio);
}
// Override width/height if needed for EXACTLY and AT_MOST specs
width = View.resolveSizeAndState(width, widthMeasureSpec, 0);
height = View.resolveSizeAndState(height, heightMeasureSpec, 0);
// Finally set the calculated dimensions
setMeasuredDimension(width, height);
}
}
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