arangelov | 38a6fce | 2019-12-02 18:21:22 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2019 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.internal.app; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.util.AttributeSet; |
| 21 | import android.view.View; |
| 22 | |
| 23 | import com.android.internal.widget.ViewPager; |
| 24 | |
| 25 | /** |
| 26 | * A {@link ViewPager} which wraps around its first child's height. |
| 27 | * <p>Normally {@link ViewPager} instances expand their height to cover all remaining space in |
| 28 | * the layout. |
| 29 | * <p>This class is used for the intent resolver picker's tabbed view to maintain |
| 30 | * consistency with the previous behavior. |
| 31 | */ |
| 32 | public class WrapHeightViewPager extends ViewPager { |
| 33 | |
| 34 | public WrapHeightViewPager(Context context) { |
| 35 | super(context); |
| 36 | } |
| 37 | |
| 38 | public WrapHeightViewPager(Context context, AttributeSet attrs) { |
| 39 | super(context, attrs); |
| 40 | } |
| 41 | |
| 42 | public WrapHeightViewPager(Context context, AttributeSet attrs, int defStyleAttr) { |
| 43 | super(context, attrs, defStyleAttr); |
| 44 | } |
| 45 | |
| 46 | public WrapHeightViewPager(Context context, AttributeSet attrs, |
| 47 | int defStyleAttr, int defStyleRes) { |
| 48 | super(context, attrs, defStyleAttr, defStyleRes); |
| 49 | } |
| 50 | |
| 51 | // TODO(arangelov): When we have multiple pages, the height should wrap to the currently |
| 52 | // displayed page. Investigate whether onMeasure is called when changing a page, and instead |
| 53 | // of getChildAt(0), use the currently displayed one. |
| 54 | @Override |
| 55 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 56 | super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| 57 | if (MeasureSpec.getMode(heightMeasureSpec) != MeasureSpec.AT_MOST) { |
| 58 | return; |
| 59 | } |
| 60 | widthMeasureSpec = MeasureSpec.makeMeasureSpec(getMeasuredWidth(), MeasureSpec.EXACTLY); |
| 61 | int height = getMeasuredHeight(); |
| 62 | if (getChildCount() > 0) { |
| 63 | View firstChild = getChildAt(0); |
| 64 | firstChild.measure(widthMeasureSpec, |
| 65 | MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST)); |
| 66 | height = firstChild.getMeasuredHeight(); |
| 67 | } |
| 68 | heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); |
| 69 | super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| 70 | } |
| 71 | } |