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/*
* Copyright (C) 2016 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.setupwizardlib.view;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Build.VERSION_CODES;
import android.util.AttributeSet;
import android.widget.FrameLayout;
import com.android.setupwizardlib.R;
/**
* A FrameLayout subclass that has an "intrinsic size", which is the size it wants to be if that is
* within the constraints given by the parent. The intrinsic size can be set with the
* {@code android:width} and {@code android:height} attributes in XML.
*
* Note that for the intrinsic size to be meaningful, {@code android:layout_width} and/or
* {@code android:layout_height} will need to be {@code wrap_content}.
*/
public class IntrinsicSizeFrameLayout extends FrameLayout {
private int mIntrinsicHeight = 0;
private int mIntrinsicWidth = 0;
public IntrinsicSizeFrameLayout(Context context) {
super(context);
init(context, null, 0);
}
public IntrinsicSizeFrameLayout(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs, 0);
}
@TargetApi(VERSION_CODES.HONEYCOMB)
public IntrinsicSizeFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context, attrs, defStyleAttr);
}
private void init(Context context, AttributeSet attrs, int defStyleAttr) {
final TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.SuwIntrinsicSizeFrameLayout, defStyleAttr, 0);
mIntrinsicHeight =
a.getDimensionPixelSize(R.styleable.SuwIntrinsicSizeFrameLayout_android_height, 0);
mIntrinsicWidth =
a.getDimensionPixelSize(R.styleable.SuwIntrinsicSizeFrameLayout_android_width, 0);
a.recycle();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(getIntrinsicMeasureSpec(widthMeasureSpec, mIntrinsicWidth),
getIntrinsicMeasureSpec(heightMeasureSpec, mIntrinsicHeight));
}
private int getIntrinsicMeasureSpec(int measureSpec, int intrinsicSize) {
if (intrinsicSize <= 0) {
// Intrinsic size is not set, just return the original spec
return measureSpec;
}
final int mode = MeasureSpec.getMode(measureSpec);
final int size = MeasureSpec.getSize(measureSpec);
if (mode == MeasureSpec.UNSPECIFIED) {
// Parent did not give any constraint, so we'll be the intrinsic size
return MeasureSpec.makeMeasureSpec(mIntrinsicHeight, MeasureSpec.EXACTLY);
} else if (mode == MeasureSpec.AT_MOST) {
// If intrinsic size is within parents constraint, take the intrinsic size.
// Otherwise take the parents size because that's closest to the intrinsic size.
return MeasureSpec.makeMeasureSpec(Math.min(size, mIntrinsicHeight),
MeasureSpec.EXACTLY);
}
// Parent specified EXACTLY, or in all other cases, just return the original spec
return measureSpec;
}
}
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