| /* |
| * Copyright (C) 2014 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.example.android.activityscenetransitionbasic; |
| |
| import android.content.Context; |
| import android.util.AttributeSet; |
| import android.widget.FrameLayout; |
| |
| /** |
| * {@link android.widget.FrameLayout} which forces itself to be laid out as square. |
| */ |
| public class SquareFrameLayout extends FrameLayout { |
| |
| public SquareFrameLayout(Context context) { |
| super(context); |
| } |
| |
| public SquareFrameLayout(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| } |
| |
| public SquareFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) { |
| super(context, attrs, defStyleAttr); |
| } |
| |
| public SquareFrameLayout(Context context, AttributeSet attrs, |
| int defStyleAttr, int defStyleRes) { |
| super(context, attrs, defStyleAttr, defStyleRes); |
| } |
| |
| @Override |
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| final int widthSize = MeasureSpec.getSize(widthMeasureSpec); |
| final int heightSize = MeasureSpec.getSize(heightMeasureSpec); |
| |
| if (widthSize == 0 && heightSize == 0) { |
| // If there are no constraints on size, let FrameLayout measure |
| super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| |
| // Now use the smallest of the measured dimensions for both dimensions |
| final int minSize = Math.min(getMeasuredWidth(), getMeasuredHeight()); |
| setMeasuredDimension(minSize, minSize); |
| return; |
| } |
| |
| final int size; |
| if (widthSize == 0 || heightSize == 0) { |
| // If one of the dimensions has no restriction on size, set both dimensions to be the |
| // on that does |
| size = Math.max(widthSize, heightSize); |
| } else { |
| // Both dimensions have restrictions on size, set both dimensions to be the |
| // smallest of the two |
| size = Math.min(widthSize, heightSize); |
| } |
| |
| final int newMeasureSpec = MeasureSpec.makeMeasureSpec(size, MeasureSpec.EXACTLY); |
| super.onMeasure(newMeasureSpec, newMeasureSpec); |
| } |
| } |