Adrian Roos | c1a80b0 | 2016-04-05 14:54:55 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 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.widget; |
| 18 | |
| 19 | import com.android.internal.R; |
| 20 | |
| 21 | import android.annotation.Nullable; |
| 22 | import android.content.Context; |
| 23 | import android.content.res.TypedArray; |
| 24 | import android.graphics.Canvas; |
| 25 | import android.util.AttributeSet; |
| 26 | import android.view.RemotableViewMethod; |
| 27 | import android.view.View; |
| 28 | import android.view.ViewGroup; |
| 29 | import android.widget.RemoteViews; |
| 30 | |
| 31 | /** |
| 32 | * A custom-built layout for the Notification.MessagingStyle. |
| 33 | * |
| 34 | * Evicts children until they all fit. |
| 35 | */ |
| 36 | @RemoteViews.RemoteView |
| 37 | public class MessagingLinearLayout extends ViewGroup { |
| 38 | |
| 39 | /** |
| 40 | * Spacing to be applied between views. |
| 41 | */ |
| 42 | private int mSpacing; |
| 43 | |
| 44 | /** |
| 45 | * The maximum height allowed. |
| 46 | */ |
| 47 | private int mMaxHeight; |
| 48 | |
| 49 | private int mIndentLines; |
| 50 | |
Adrian Roos | feafa05 | 2016-06-01 17:09:45 -0700 | [diff] [blame] | 51 | /** |
| 52 | * Id of the child that's also visible in the contracted layout. |
| 53 | */ |
| 54 | private int mContractedChildId; |
| 55 | |
Adrian Roos | c1a80b0 | 2016-04-05 14:54:55 -0700 | [diff] [blame] | 56 | public MessagingLinearLayout(Context context, @Nullable AttributeSet attrs) { |
| 57 | super(context, attrs); |
| 58 | |
| 59 | final TypedArray a = context.obtainStyledAttributes(attrs, |
| 60 | R.styleable.MessagingLinearLayout, 0, |
| 61 | 0); |
| 62 | |
| 63 | final int N = a.getIndexCount(); |
| 64 | for (int i = 0; i < N; i++) { |
| 65 | int attr = a.getIndex(i); |
| 66 | switch (attr) { |
| 67 | case R.styleable.MessagingLinearLayout_maxHeight: |
| 68 | mMaxHeight = a.getDimensionPixelSize(i, 0); |
| 69 | break; |
| 70 | case R.styleable.MessagingLinearLayout_spacing: |
| 71 | mSpacing = a.getDimensionPixelSize(i, 0); |
| 72 | break; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | if (mMaxHeight <= 0) { |
| 77 | throw new IllegalStateException( |
| 78 | "MessagingLinearLayout: Must specify positive maxHeight"); |
| 79 | } |
| 80 | |
| 81 | a.recycle(); |
| 82 | } |
| 83 | |
| 84 | |
| 85 | @Override |
| 86 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 87 | // This is essentially a bottom-up linear layout that only adds children that fit entirely |
| 88 | // up to a maximum height. |
| 89 | |
| 90 | switch (MeasureSpec.getMode(heightMeasureSpec)) { |
| 91 | case MeasureSpec.AT_MOST: |
| 92 | heightMeasureSpec = MeasureSpec.makeMeasureSpec( |
| 93 | Math.min(mMaxHeight, MeasureSpec.getSize(heightMeasureSpec)), |
| 94 | MeasureSpec.AT_MOST); |
| 95 | break; |
| 96 | case MeasureSpec.UNSPECIFIED: |
| 97 | heightMeasureSpec = MeasureSpec.makeMeasureSpec( |
| 98 | mMaxHeight, |
| 99 | MeasureSpec.AT_MOST); |
| 100 | break; |
| 101 | case MeasureSpec.EXACTLY: |
| 102 | break; |
| 103 | } |
| 104 | final int targetHeight = MeasureSpec.getSize(heightMeasureSpec); |
| 105 | final int count = getChildCount(); |
| 106 | |
| 107 | for (int i = 0; i < count; ++i) { |
| 108 | final View child = getChildAt(i); |
| 109 | final LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| 110 | lp.hide = true; |
| 111 | } |
| 112 | |
| 113 | int totalHeight = mPaddingTop + mPaddingBottom; |
| 114 | boolean first = true; |
| 115 | |
| 116 | // Starting from the bottom: we measure every view as if it were the only one. If it still |
| 117 | // fits, we take it, otherwise we stop there. |
| 118 | for (int i = count - 1; i >= 0 && totalHeight < targetHeight; i--) { |
| 119 | if (getChildAt(i).getVisibility() == GONE) { |
| 120 | continue; |
| 121 | } |
| 122 | final View child = getChildAt(i); |
| 123 | LayoutParams lp = (LayoutParams) getChildAt(i).getLayoutParams(); |
| 124 | |
| 125 | if (child instanceof ImageFloatingTextView) { |
| 126 | // Pretend we need the image padding for all views, we don't know which |
| 127 | // one will end up needing to do this (might end up not using all the space, |
| 128 | // but calculating this exactly would be more expensive). |
| 129 | ((ImageFloatingTextView) child).setNumIndentLines(mIndentLines); |
| 130 | } |
| 131 | |
| 132 | measureChildWithMargins(child, widthMeasureSpec, 0, heightMeasureSpec, 0); |
| 133 | |
| 134 | final int childHeight = child.getMeasuredHeight(); |
| 135 | int newHeight = Math.max(totalHeight, totalHeight + childHeight + lp.topMargin + |
| 136 | lp.bottomMargin + (first ? 0 : mSpacing)); |
| 137 | first = false; |
| 138 | |
| 139 | if (newHeight <= targetHeight) { |
| 140 | totalHeight = newHeight; |
| 141 | lp.hide = false; |
| 142 | } else { |
| 143 | break; |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | // Now that we know which views to take, fix up the indents and see what width we get. |
| 148 | int measuredWidth = mPaddingLeft + mPaddingRight; |
| 149 | int imageLines = mIndentLines; |
| 150 | for (int i = 0; i < count; i++) { |
| 151 | final View child = getChildAt(i); |
| 152 | final LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| 153 | |
| 154 | if (child.getVisibility() == GONE || lp.hide) { |
| 155 | continue; |
| 156 | } |
| 157 | |
| 158 | if (child instanceof ImageFloatingTextView) { |
| 159 | ImageFloatingTextView textChild = (ImageFloatingTextView) child; |
| 160 | if (imageLines == 2 && textChild.getLineCount() > 2) { |
| 161 | // HACK: If we need indent for two lines, and they're coming from the same |
| 162 | // view, we need extra spacing to compensate for the lack of margins, |
| 163 | // so add an extra line of indent. |
| 164 | imageLines = 3; |
| 165 | } |
| 166 | boolean changed = textChild.setNumIndentLines(Math.max(0, imageLines)); |
| 167 | if (changed) { |
| 168 | measureChildWithMargins(child, widthMeasureSpec, 0, heightMeasureSpec, 0); |
| 169 | } |
| 170 | imageLines -= textChild.getLineCount(); |
| 171 | } |
| 172 | |
| 173 | measuredWidth = Math.max(measuredWidth, |
| 174 | child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin |
| 175 | + mPaddingLeft + mPaddingRight); |
| 176 | } |
| 177 | |
| 178 | |
| 179 | setMeasuredDimension( |
| 180 | resolveSize(Math.max(getSuggestedMinimumWidth(), measuredWidth), |
| 181 | widthMeasureSpec), |
| 182 | resolveSize(Math.max(getSuggestedMinimumHeight(), totalHeight), |
| 183 | heightMeasureSpec)); |
| 184 | } |
| 185 | |
| 186 | @Override |
| 187 | protected void onLayout(boolean changed, int left, int top, int right, int bottom) { |
| 188 | final int paddingLeft = mPaddingLeft; |
| 189 | |
| 190 | int childTop; |
| 191 | |
| 192 | // Where right end of child should go |
| 193 | final int width = right - left; |
| 194 | final int childRight = width - mPaddingRight; |
| 195 | |
| 196 | final int layoutDirection = getLayoutDirection(); |
| 197 | final int count = getChildCount(); |
| 198 | |
| 199 | childTop = mPaddingTop; |
| 200 | |
| 201 | boolean first = true; |
| 202 | |
| 203 | for (int i = 0; i < count; i++) { |
| 204 | final View child = getChildAt(i); |
| 205 | final LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| 206 | |
| 207 | if (child.getVisibility() == GONE || lp.hide) { |
| 208 | continue; |
| 209 | } |
| 210 | |
| 211 | final int childWidth = child.getMeasuredWidth(); |
| 212 | final int childHeight = child.getMeasuredHeight(); |
| 213 | |
| 214 | int childLeft; |
| 215 | if (layoutDirection == LAYOUT_DIRECTION_RTL) { |
| 216 | childLeft = childRight - childWidth - lp.rightMargin; |
| 217 | } else { |
| 218 | childLeft = paddingLeft + lp.leftMargin; |
| 219 | } |
| 220 | |
| 221 | if (!first) { |
| 222 | childTop += mSpacing; |
| 223 | } |
| 224 | |
| 225 | childTop += lp.topMargin; |
| 226 | child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight); |
| 227 | |
| 228 | childTop += childHeight + lp.bottomMargin; |
| 229 | |
| 230 | first = false; |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | @Override |
| 235 | protected boolean drawChild(Canvas canvas, View child, long drawingTime) { |
| 236 | final LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| 237 | if (lp.hide) { |
| 238 | return true; |
| 239 | } |
| 240 | return super.drawChild(canvas, child, drawingTime); |
| 241 | } |
| 242 | |
| 243 | @Override |
| 244 | public LayoutParams generateLayoutParams(AttributeSet attrs) { |
| 245 | return new LayoutParams(mContext, attrs); |
| 246 | } |
| 247 | |
| 248 | @Override |
| 249 | protected LayoutParams generateDefaultLayoutParams() { |
| 250 | return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); |
| 251 | |
| 252 | } |
| 253 | |
| 254 | @Override |
| 255 | protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams lp) { |
| 256 | LayoutParams copy = new LayoutParams(lp.width, lp.height); |
| 257 | if (lp instanceof MarginLayoutParams) { |
| 258 | copy.copyMarginsFrom((MarginLayoutParams) lp); |
| 259 | } |
| 260 | return copy; |
| 261 | } |
| 262 | |
Adrian Roos | c1a80b0 | 2016-04-05 14:54:55 -0700 | [diff] [blame] | 263 | /** |
| 264 | * Sets how many lines should be indented to avoid a floating image. |
| 265 | */ |
Adrian Roos | feafa05 | 2016-06-01 17:09:45 -0700 | [diff] [blame] | 266 | @RemotableViewMethod |
Adrian Roos | c1a80b0 | 2016-04-05 14:54:55 -0700 | [diff] [blame] | 267 | public void setNumIndentLines(int numberLines) { |
| 268 | mIndentLines = numberLines; |
| 269 | } |
| 270 | |
Adrian Roos | feafa05 | 2016-06-01 17:09:45 -0700 | [diff] [blame] | 271 | /** |
| 272 | * Set id of the child that's also visible in the contracted layout. |
| 273 | */ |
| 274 | @RemotableViewMethod |
| 275 | public void setContractedChildId(int contractedChildId) { |
| 276 | mContractedChildId = contractedChildId; |
| 277 | } |
| 278 | |
| 279 | /** |
| 280 | * Get id of the child that's also visible in the contracted layout. |
| 281 | */ |
| 282 | public int getContractedChildId() { |
| 283 | return mContractedChildId; |
| 284 | } |
| 285 | |
Adrian Roos | c1a80b0 | 2016-04-05 14:54:55 -0700 | [diff] [blame] | 286 | public static class LayoutParams extends MarginLayoutParams { |
| 287 | |
| 288 | boolean hide = false; |
| 289 | |
| 290 | public LayoutParams(Context c, AttributeSet attrs) { |
| 291 | super(c, attrs); |
| 292 | } |
| 293 | |
| 294 | public LayoutParams(int width, int height) { |
| 295 | super(width, height); |
| 296 | } |
| 297 | } |
| 298 | } |