102 lines
3.6 KiB
Java
102 lines
3.6 KiB
Java
/*
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* Copyright (C) 2015 Hippo Seven
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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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* 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.hippo.widget;
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import android.annotation.TargetApi;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.os.Build;
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import android.util.AttributeSet;
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import android.widget.FrameLayout;
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import com.hippo.ehviewer.R;
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/**
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* aspect is width / height
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*/
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public class FixedAspectLayout extends FrameLayout {
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private float mAspect = -1f;
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public FixedAspectLayout(Context context) {
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super(context);
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}
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public FixedAspectLayout(Context context, AttributeSet attrs) {
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super(context, attrs);
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init(context, attrs, 0, 0);
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}
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public FixedAspectLayout(Context context, AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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init(context, attrs, defStyleAttr, 0);
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}
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@TargetApi(Build.VERSION_CODES.LOLLIPOP)
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public FixedAspectLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
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super(context, attrs, defStyleAttr, defStyleRes);
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init(context, attrs, defStyleAttr, defStyleRes);
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}
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private void init(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
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TypedArray a = context.obtainStyledAttributes(
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attrs, R.styleable.FixedAspectLayout, defStyleAttr, defStyleRes);
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setAspect(a.getFloat(R.styleable.FixedAspectLayout_falAspect, -1f));
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a.recycle();
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}
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public void setAspect(float ratio) {
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if (ratio > 0) {
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mAspect = ratio;
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} else {
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mAspect = -1f;
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}
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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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if (mAspect > 0.0f) {
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final int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
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final int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
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int width;
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int height;
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if (widthSpecMode == MeasureSpec.EXACTLY && heightSpecMode != MeasureSpec.EXACTLY) {
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width = MeasureSpec.getSize(widthMeasureSpec);
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int maxheight;
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if (heightSpecMode == MeasureSpec.AT_MOST) {
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maxheight = MeasureSpec.getSize(heightMeasureSpec);
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} else {
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maxheight = Integer.MAX_VALUE;
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}
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height = Math.min((int) (width / mAspect), maxheight);
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heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
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} else if (heightSpecMode == MeasureSpec.EXACTLY && widthSpecMode != MeasureSpec.EXACTLY) {
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height = MeasureSpec.getSize(heightMeasureSpec);
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int maxWidth;
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if (widthSpecMode == MeasureSpec.AT_MOST) {
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maxWidth = MeasureSpec.getSize(widthSpecMode);
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} else {
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maxWidth = Integer.MAX_VALUE;
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}
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width = Math.min((int) (height * mAspect), maxWidth);
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widthMeasureSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY);
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}
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}
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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}
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}
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