87 lines
3.1 KiB
Java
87 lines
3.1 KiB
Java
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package com.android.incallui.answer.impl;
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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.view.SurfaceView;
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import android.view.View;
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import com.android.dialer.common.Assert;
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/**
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* A SurfaceView that maintains its aspect ratio to be a desired target value.
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*
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* <p>The FixedAspectSurfaceView will not be able to maintain the requested aspect ratio if both the
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* width and the height are exactly determined by the layout. To avoid this, ensure that either the
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* height or the width is adjustable by the view; for example, by setting the layout parameters to
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* be WRAP_CONTENT for the dimension that is best adjusted to maintain the aspect ratio.
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*/
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public class FixedAspectSurfaceView extends SurfaceView {
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/** Desired width/height ratio */
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private float aspectRatio;
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private final boolean scaleWidth;
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private final boolean scaleHeight;
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public FixedAspectSurfaceView(Context context, AttributeSet attrs) {
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super(context, attrs);
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// Get initial aspect ratio from custom attributes
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TypedArray a =
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context.getTheme().obtainStyledAttributes(attrs, R.styleable.FixedAspectSurfaceView, 0, 0);
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scaleHeight = a.getBoolean(R.styleable.FixedAspectSurfaceView_scaleHeight, false);
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scaleWidth = a.getBoolean(R.styleable.FixedAspectSurfaceView_scaleWidth, false);
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Assert.checkArgument(scaleHeight != scaleWidth, "Must either scale width or height");
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setAspectRatio(a.getFloat(R.styleable.FixedAspectSurfaceView_aspectRatio, 1.f));
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a.recycle();
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}
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/**
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* Set the desired aspect ratio for this view.
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*
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* @param aspect the desired width/height ratio in the current UI orientation. Must be a positive
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* value.
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*/
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public void setAspectRatio(float aspect) {
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Assert.checkArgument(aspect >= 0, "Aspect ratio must be positive");
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aspectRatio = aspect;
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requestLayout();
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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int width = MeasureSpec.getSize(widthMeasureSpec);
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int height = MeasureSpec.getSize(heightMeasureSpec);
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// Do the scaling
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if (scaleWidth) {
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width = (int) (height * aspectRatio);
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} else if (scaleHeight) {
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height = (int) (width / aspectRatio);
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}
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// Override width/height if needed for EXACTLY and AT_MOST specs
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width = View.resolveSizeAndState(width, widthMeasureSpec, 0);
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height = View.resolveSizeAndState(height, heightMeasureSpec, 0);
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// Finally set the calculated dimensions
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setMeasuredDimension(width, height);
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}
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}
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