Yury Khmel | 4f26c04 | 2015-09-02 17:39:14 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except |
| 5 | * in compliance with the License. You may obtain a copy of the License at |
| 6 | * |
| 7 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | * |
| 9 | * Unless required by applicable law or agreed to in writing, software distributed under the License |
| 10 | * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
| 11 | * or implied. See the License for the specific language governing permissions and limitations under |
| 12 | * the License. |
| 13 | */ |
| 14 | package android.windowanimationjank; |
| 15 | |
| 16 | import android.content.Context; |
| 17 | import android.util.AttributeSet; |
| 18 | import android.view.View; |
| 19 | import android.view.ViewGroup; |
| 20 | |
| 21 | /** |
| 22 | * Custom layout that place all elements in flows with and automatically wraps them. |
| 23 | */ |
| 24 | public class FlowLayout extends ViewGroup { |
| 25 | private int mLineHeight; |
| 26 | |
| 27 | public FlowLayout(Context context) { |
| 28 | super(context); |
| 29 | } |
| 30 | |
| 31 | public FlowLayout(Context context, AttributeSet attrs) { |
| 32 | super(context, attrs); |
| 33 | } |
| 34 | |
| 35 | @Override |
| 36 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 37 | final int width = |
| 38 | MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() -getPaddingRight(); |
| 39 | int height = |
| 40 | MeasureSpec.getSize(heightMeasureSpec) - getPaddingTop() - getPaddingBottom(); |
| 41 | final int count = getChildCount(); |
| 42 | |
| 43 | int x = getPaddingLeft(); |
| 44 | int y = getPaddingTop(); |
| 45 | int lineHeight = 0; |
| 46 | |
| 47 | int childHeightMeasureSpec; |
| 48 | if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) { |
| 49 | childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST); |
| 50 | } else { |
| 51 | childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); |
| 52 | } |
| 53 | |
| 54 | for (int i = 0; i < count; i++) { |
| 55 | final View child = getChildAt(i); |
| 56 | if (child.getVisibility() != GONE) { |
| 57 | child.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.AT_MOST), |
| 58 | childHeightMeasureSpec); |
| 59 | final int childWidth = child.getMeasuredWidth(); |
| 60 | lineHeight = Math.max(lineHeight, child.getMeasuredHeight()); |
| 61 | |
| 62 | if (x + childWidth > width) { |
| 63 | x = getPaddingLeft(); |
| 64 | y += lineHeight; |
| 65 | } |
| 66 | |
| 67 | x += childWidth; |
| 68 | } |
| 69 | } |
| 70 | mLineHeight = lineHeight; |
| 71 | |
| 72 | if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.UNSPECIFIED) { |
| 73 | height = y + lineHeight; |
| 74 | } else if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) { |
| 75 | if (y + lineHeight < height) { |
| 76 | height = y + lineHeight; |
| 77 | } |
| 78 | } |
| 79 | setMeasuredDimension(width, height); |
| 80 | } |
| 81 | |
| 82 | @Override |
| 83 | protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { |
| 84 | if (p instanceof LayoutParams) { |
| 85 | return true; |
| 86 | } |
| 87 | return false; |
| 88 | } |
| 89 | |
| 90 | @Override |
| 91 | protected void onLayout(boolean changed, int l, int t, int r, int b) { |
| 92 | final int count = getChildCount(); |
| 93 | final int width = r - l; |
| 94 | int x = getPaddingLeft(); |
| 95 | int y = getPaddingTop(); |
| 96 | |
| 97 | for (int i = 0; i < count; i++) { |
| 98 | final View child = getChildAt(i); |
| 99 | if (child.getVisibility() != GONE) { |
| 100 | final int childWidth = child.getMeasuredWidth(); |
| 101 | final int childHeight = child.getMeasuredHeight(); |
| 102 | if (x + childWidth > width) { |
| 103 | x = getPaddingLeft(); |
| 104 | y += mLineHeight; |
| 105 | } |
| 106 | child.layout(x, y, x + childWidth, y + childHeight); |
| 107 | x += childWidth; |
| 108 | } |
| 109 | } |
| 110 | } |
| 111 | } |