Chris Wren | 3a59d6e | 2012-03-30 18:28:14 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 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 | |
Chris Wren | 54dfa5d | 2012-04-24 09:50:03 -0400 | [diff] [blame] | 19 | import java.lang.Math; |
| 20 | |
Chris Wren | 3a59d6e | 2012-03-30 18:28:14 -0400 | [diff] [blame] | 21 | import com.android.internal.R; |
| 22 | |
| 23 | import android.animation.Animator; |
| 24 | import android.animation.Animator.AnimatorListener; |
| 25 | import android.animation.AnimatorSet; |
| 26 | import android.animation.ObjectAnimator; |
| 27 | import android.content.Context; |
| 28 | import android.content.res.TypedArray; |
| 29 | import android.graphics.Color; |
| 30 | import android.graphics.drawable.ColorDrawable; |
Chris Wren | d84e593 | 2012-04-19 17:58:03 -0400 | [diff] [blame] | 31 | import android.graphics.drawable.Drawable; |
| 32 | import android.graphics.drawable.StateListDrawable; |
Chris Wren | 3a59d6e | 2012-03-30 18:28:14 -0400 | [diff] [blame] | 33 | import android.util.AttributeSet; |
| 34 | import android.util.Log; |
Chris Wren | d84e593 | 2012-04-19 17:58:03 -0400 | [diff] [blame] | 35 | import android.util.StateSet; |
Chris Wren | 3a59d6e | 2012-03-30 18:28:14 -0400 | [diff] [blame] | 36 | import android.view.View; |
| 37 | import android.view.ViewDebug; |
| 38 | import android.view.ViewGroup; |
| 39 | import android.widget.RemoteViews.RemoteView; |
| 40 | |
| 41 | /** |
| 42 | * A layout that switches between its children based on the requested layout height. |
| 43 | * Each child specifies its minimum and maximum valid height. Results are undefined |
| 44 | * if children specify overlapping ranges. A child may specify the maximum height |
| 45 | * as 'unbounded' to indicate that it is willing to be displayed arbitrarily tall. |
| 46 | * |
| 47 | * <p> |
| 48 | * See {@link SizeAdaptiveLayout.LayoutParams} for a full description of the |
| 49 | * layout parameters used by SizeAdaptiveLayout. |
| 50 | */ |
| 51 | @RemoteView |
| 52 | public class SizeAdaptiveLayout extends ViewGroup { |
| 53 | |
| 54 | private static final String TAG = "SizeAdaptiveLayout"; |
| 55 | private static final boolean DEBUG = false; |
Chris Wren | ed5cc0e | 2012-06-21 11:25:58 -0400 | [diff] [blame] | 56 | private static final boolean REPORT_BAD_BOUNDS = true; |
Chris Wren | 3a59d6e | 2012-03-30 18:28:14 -0400 | [diff] [blame] | 57 | private static final long CROSSFADE_TIME = 250; |
| 58 | |
| 59 | // TypedArray indices |
| 60 | private static final int MIN_VALID_HEIGHT = |
| 61 | R.styleable.SizeAdaptiveLayout_Layout_layout_minHeight; |
| 62 | private static final int MAX_VALID_HEIGHT = |
| 63 | R.styleable.SizeAdaptiveLayout_Layout_layout_maxHeight; |
| 64 | |
| 65 | // view state |
| 66 | private View mActiveChild; |
| 67 | private View mLastActive; |
| 68 | |
| 69 | // animation state |
| 70 | private AnimatorSet mTransitionAnimation; |
| 71 | private AnimatorListener mAnimatorListener; |
| 72 | private ObjectAnimator mFadePanel; |
| 73 | private ObjectAnimator mFadeView; |
| 74 | private int mCanceledAnimationCount; |
| 75 | private View mEnteringView; |
| 76 | private View mLeavingView; |
| 77 | // View used to hide larger views under smaller ones to create a uniform crossfade |
| 78 | private View mModestyPanel; |
| 79 | private int mModestyPanelTop; |
| 80 | |
| 81 | public SizeAdaptiveLayout(Context context) { |
| 82 | super(context); |
| 83 | initialize(); |
| 84 | } |
| 85 | |
| 86 | public SizeAdaptiveLayout(Context context, AttributeSet attrs) { |
| 87 | super(context, attrs); |
| 88 | initialize(); |
| 89 | } |
| 90 | |
| 91 | public SizeAdaptiveLayout(Context context, AttributeSet attrs, int defStyle) { |
| 92 | super(context, attrs, defStyle); |
| 93 | initialize(); |
| 94 | } |
| 95 | |
| 96 | private void initialize() { |
| 97 | mModestyPanel = new View(getContext()); |
| 98 | // If the SizeAdaptiveLayout has a solid background, use it as a transition hint. |
Chris Wren | d84e593 | 2012-04-19 17:58:03 -0400 | [diff] [blame] | 99 | Drawable background = getBackground(); |
| 100 | if (background instanceof StateListDrawable) { |
| 101 | StateListDrawable sld = (StateListDrawable) background; |
| 102 | sld.setState(StateSet.WILD_CARD); |
| 103 | background = sld.getCurrent(); |
| 104 | } |
| 105 | if (background instanceof ColorDrawable) { |
| 106 | mModestyPanel.setBackgroundDrawable(background); |
Chris Wren | 3a59d6e | 2012-03-30 18:28:14 -0400 | [diff] [blame] | 107 | } else { |
| 108 | mModestyPanel.setBackgroundColor(Color.BLACK); |
| 109 | } |
| 110 | SizeAdaptiveLayout.LayoutParams layout = |
| 111 | new SizeAdaptiveLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, |
| 112 | ViewGroup.LayoutParams.MATCH_PARENT); |
| 113 | mModestyPanel.setLayoutParams(layout); |
| 114 | addView(mModestyPanel); |
| 115 | mFadePanel = ObjectAnimator.ofFloat(mModestyPanel, "alpha", 0f); |
| 116 | mFadeView = ObjectAnimator.ofFloat(null, "alpha", 0f); |
| 117 | mAnimatorListener = new BringToFrontOnEnd(); |
| 118 | mTransitionAnimation = new AnimatorSet(); |
| 119 | mTransitionAnimation.play(mFadeView).with(mFadePanel); |
| 120 | mTransitionAnimation.setDuration(CROSSFADE_TIME); |
| 121 | mTransitionAnimation.addListener(mAnimatorListener); |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Visible for testing |
| 126 | * @hide |
| 127 | */ |
| 128 | public Animator getTransitionAnimation() { |
| 129 | return mTransitionAnimation; |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * Visible for testing |
| 134 | * @hide |
| 135 | */ |
| 136 | public View getModestyPanel() { |
| 137 | return mModestyPanel; |
| 138 | } |
| 139 | |
| 140 | @Override |
| 141 | public void onAttachedToWindow() { |
| 142 | mLastActive = null; |
| 143 | // make sure all views start off invisible. |
| 144 | for (int i = 0; i < getChildCount(); i++) { |
| 145 | getChildAt(i).setVisibility(View.GONE); |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | @Override |
| 150 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 151 | if (DEBUG) Log.d(TAG, this + " measure spec: " + |
| 152 | MeasureSpec.toString(heightMeasureSpec)); |
| 153 | View model = selectActiveChild(heightMeasureSpec); |
| 154 | SizeAdaptiveLayout.LayoutParams lp = |
| 155 | (SizeAdaptiveLayout.LayoutParams) model.getLayoutParams(); |
| 156 | if (DEBUG) Log.d(TAG, "active min: " + lp.minHeight + " max: " + lp.maxHeight); |
| 157 | measureChild(model, widthMeasureSpec, heightMeasureSpec); |
| 158 | int childHeight = model.getMeasuredHeight(); |
| 159 | int childWidth = model.getMeasuredHeight(); |
| 160 | int childState = combineMeasuredStates(0, model.getMeasuredState()); |
| 161 | if (DEBUG) Log.d(TAG, "measured child at: " + childHeight); |
| 162 | int resolvedWidth = resolveSizeAndState(childWidth, widthMeasureSpec, childState); |
Chris Wren | 54dfa5d | 2012-04-24 09:50:03 -0400 | [diff] [blame] | 163 | int resolvedHeight = resolveSizeAndState(childHeight, heightMeasureSpec, childState); |
| 164 | if (DEBUG) Log.d(TAG, "resolved to: " + resolvedHeight); |
| 165 | int boundedHeight = clampSizeToBounds(resolvedHeight, model); |
| 166 | if (DEBUG) Log.d(TAG, "bounded to: " + boundedHeight); |
| 167 | setMeasuredDimension(resolvedWidth, boundedHeight); |
| 168 | } |
| 169 | |
| 170 | private int clampSizeToBounds(int measuredHeight, View child) { |
| 171 | SizeAdaptiveLayout.LayoutParams lp = |
| 172 | (SizeAdaptiveLayout.LayoutParams) child.getLayoutParams(); |
| 173 | int heightIn = View.MEASURED_SIZE_MASK & measuredHeight; |
| 174 | int height = Math.max(heightIn, lp.minHeight); |
| 175 | if (lp.maxHeight != SizeAdaptiveLayout.LayoutParams.UNBOUNDED) { |
| 176 | height = Math.min(height, lp.maxHeight); |
| 177 | } |
| 178 | |
Chris Wren | ed5cc0e | 2012-06-21 11:25:58 -0400 | [diff] [blame] | 179 | if (REPORT_BAD_BOUNDS && heightIn != height) { |
Chris Wren | 54dfa5d | 2012-04-24 09:50:03 -0400 | [diff] [blame] | 180 | Log.d(TAG, this + "child view " + child + " " + |
| 181 | "measured out of bounds at " + heightIn +"px " + |
| 182 | "clamped to " + height + "px"); |
| 183 | } |
| 184 | |
| 185 | return height; |
Chris Wren | 3a59d6e | 2012-03-30 18:28:14 -0400 | [diff] [blame] | 186 | } |
| 187 | |
| 188 | //TODO extend to width and height |
| 189 | private View selectActiveChild(int heightMeasureSpec) { |
| 190 | final int heightMode = MeasureSpec.getMode(heightMeasureSpec); |
| 191 | final int heightSize = MeasureSpec.getSize(heightMeasureSpec); |
| 192 | |
| 193 | View unboundedView = null; |
| 194 | View tallestView = null; |
| 195 | int tallestViewSize = 0; |
| 196 | View smallestView = null; |
| 197 | int smallestViewSize = Integer.MAX_VALUE; |
| 198 | for (int i = 0; i < getChildCount(); i++) { |
| 199 | View child = getChildAt(i); |
| 200 | if (child != mModestyPanel) { |
| 201 | SizeAdaptiveLayout.LayoutParams lp = |
| 202 | (SizeAdaptiveLayout.LayoutParams) child.getLayoutParams(); |
| 203 | if (DEBUG) Log.d(TAG, "looking at " + i + |
| 204 | " with min: " + lp.minHeight + |
| 205 | " max: " + lp.maxHeight); |
| 206 | if (lp.maxHeight == SizeAdaptiveLayout.LayoutParams.UNBOUNDED && |
| 207 | unboundedView == null) { |
| 208 | unboundedView = child; |
| 209 | } |
| 210 | if (lp.maxHeight > tallestViewSize) { |
| 211 | tallestViewSize = lp.maxHeight; |
| 212 | tallestView = child; |
| 213 | } |
| 214 | if (lp.minHeight < smallestViewSize) { |
| 215 | smallestViewSize = lp.minHeight; |
| 216 | smallestView = child; |
| 217 | } |
| 218 | if (heightMode != MeasureSpec.UNSPECIFIED && |
| 219 | heightSize >= lp.minHeight && heightSize <= lp.maxHeight) { |
| 220 | if (DEBUG) Log.d(TAG, " found exact match, finishing early"); |
| 221 | return child; |
| 222 | } |
| 223 | } |
| 224 | } |
| 225 | if (unboundedView != null) { |
| 226 | tallestView = unboundedView; |
| 227 | } |
Fabrice Di Meglio | 8afcd14 | 2012-07-27 18:27:11 -0700 | [diff] [blame] | 228 | if (heightMode == MeasureSpec.UNSPECIFIED || heightSize > tallestViewSize) { |
Chris Wren | 3a59d6e | 2012-03-30 18:28:14 -0400 | [diff] [blame] | 229 | return tallestView; |
Fabrice Di Meglio | 8afcd14 | 2012-07-27 18:27:11 -0700 | [diff] [blame] | 230 | } else { |
| 231 | return smallestView; |
Chris Wren | 3a59d6e | 2012-03-30 18:28:14 -0400 | [diff] [blame] | 232 | } |
Chris Wren | 3a59d6e | 2012-03-30 18:28:14 -0400 | [diff] [blame] | 233 | } |
| 234 | |
| 235 | @Override |
| 236 | protected void onLayout(boolean changed, int left, int top, int right, int bottom) { |
| 237 | if (DEBUG) Log.d(TAG, this + " onlayout height: " + (bottom - top)); |
| 238 | mLastActive = mActiveChild; |
| 239 | int measureSpec = View.MeasureSpec.makeMeasureSpec(bottom - top, |
| 240 | View.MeasureSpec.EXACTLY); |
| 241 | mActiveChild = selectActiveChild(measureSpec); |
| 242 | mActiveChild.setVisibility(View.VISIBLE); |
| 243 | |
| 244 | if (mLastActive != mActiveChild && mLastActive != null) { |
| 245 | if (DEBUG) Log.d(TAG, this + " changed children from: " + mLastActive + |
| 246 | " to: " + mActiveChild); |
| 247 | |
| 248 | mEnteringView = mActiveChild; |
| 249 | mLeavingView = mLastActive; |
| 250 | |
| 251 | mEnteringView.setAlpha(1f); |
| 252 | |
| 253 | mModestyPanel.setAlpha(1f); |
| 254 | mModestyPanel.bringToFront(); |
| 255 | mModestyPanelTop = mLeavingView.getHeight(); |
| 256 | mModestyPanel.setVisibility(View.VISIBLE); |
| 257 | // TODO: mModestyPanel background should be compatible with mLeavingView |
| 258 | |
| 259 | mLeavingView.bringToFront(); |
| 260 | |
| 261 | if (mTransitionAnimation.isRunning()) { |
| 262 | mTransitionAnimation.cancel(); |
| 263 | } |
| 264 | mFadeView.setTarget(mLeavingView); |
| 265 | mFadeView.setFloatValues(0f); |
| 266 | mFadePanel.setFloatValues(0f); |
| 267 | mTransitionAnimation.setupStartValues(); |
| 268 | mTransitionAnimation.start(); |
| 269 | } |
| 270 | final int childWidth = mActiveChild.getMeasuredWidth(); |
| 271 | final int childHeight = mActiveChild.getMeasuredHeight(); |
| 272 | // TODO investigate setting LAYER_TYPE_HARDWARE on mLastActive |
Fabrice Di Meglio | 8afcd14 | 2012-07-27 18:27:11 -0700 | [diff] [blame] | 273 | mActiveChild.layout(0, 0, childWidth, childHeight); |
Chris Wren | 3a59d6e | 2012-03-30 18:28:14 -0400 | [diff] [blame] | 274 | |
| 275 | if (DEBUG) Log.d(TAG, "got modesty offset of " + mModestyPanelTop); |
Fabrice Di Meglio | 8afcd14 | 2012-07-27 18:27:11 -0700 | [diff] [blame] | 276 | mModestyPanel.layout(0, mModestyPanelTop, childWidth, mModestyPanelTop + childHeight); |
Chris Wren | 3a59d6e | 2012-03-30 18:28:14 -0400 | [diff] [blame] | 277 | } |
| 278 | |
| 279 | @Override |
| 280 | public LayoutParams generateLayoutParams(AttributeSet attrs) { |
| 281 | if (DEBUG) Log.d(TAG, "generate layout from attrs"); |
| 282 | return new SizeAdaptiveLayout.LayoutParams(getContext(), attrs); |
| 283 | } |
| 284 | |
| 285 | @Override |
| 286 | protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { |
| 287 | if (DEBUG) Log.d(TAG, "generate default layout from viewgroup"); |
| 288 | return new SizeAdaptiveLayout.LayoutParams(p); |
| 289 | } |
| 290 | |
| 291 | @Override |
| 292 | protected LayoutParams generateDefaultLayoutParams() { |
| 293 | if (DEBUG) Log.d(TAG, "generate default layout from null"); |
| 294 | return new SizeAdaptiveLayout.LayoutParams(); |
| 295 | } |
| 296 | |
| 297 | @Override |
| 298 | protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { |
| 299 | return p instanceof SizeAdaptiveLayout.LayoutParams; |
| 300 | } |
| 301 | |
| 302 | /** |
| 303 | * Per-child layout information associated with ViewSizeAdaptiveLayout. |
| 304 | * |
| 305 | * TODO extend to width and height |
| 306 | * |
| 307 | * @attr ref android.R.styleable#SizeAdaptiveLayout_Layout_layout_minHeight |
| 308 | * @attr ref android.R.styleable#SizeAdaptiveLayout_Layout_layout_maxHeight |
| 309 | */ |
| 310 | public static class LayoutParams extends ViewGroup.LayoutParams { |
| 311 | |
| 312 | /** |
| 313 | * Indicates the minimum valid height for the child. |
| 314 | */ |
| 315 | @ViewDebug.ExportedProperty(category = "layout") |
| 316 | public int minHeight; |
| 317 | |
| 318 | /** |
| 319 | * Indicates the maximum valid height for the child. |
| 320 | */ |
| 321 | @ViewDebug.ExportedProperty(category = "layout") |
| 322 | public int maxHeight; |
| 323 | |
| 324 | /** |
| 325 | * Constant value for maxHeight that indicates there is not maximum height. |
| 326 | */ |
| 327 | public static final int UNBOUNDED = -1; |
| 328 | |
| 329 | /** |
| 330 | * {@inheritDoc} |
| 331 | */ |
| 332 | public LayoutParams(Context c, AttributeSet attrs) { |
| 333 | super(c, attrs); |
| 334 | if (DEBUG) { |
| 335 | Log.d(TAG, "construct layout from attrs"); |
| 336 | for (int i = 0; i < attrs.getAttributeCount(); i++) { |
| 337 | Log.d(TAG, " " + attrs.getAttributeName(i) + " = " + |
| 338 | attrs.getAttributeValue(i)); |
| 339 | } |
| 340 | } |
| 341 | TypedArray a = |
| 342 | c.obtainStyledAttributes(attrs, |
| 343 | R.styleable.SizeAdaptiveLayout_Layout); |
| 344 | |
| 345 | minHeight = a.getDimensionPixelSize(MIN_VALID_HEIGHT, 0); |
| 346 | if (DEBUG) Log.d(TAG, "got minHeight of: " + minHeight); |
| 347 | |
| 348 | try { |
| 349 | maxHeight = a.getLayoutDimension(MAX_VALID_HEIGHT, UNBOUNDED); |
| 350 | if (DEBUG) Log.d(TAG, "got maxHeight of: " + maxHeight); |
| 351 | } catch (Exception e) { |
| 352 | if (DEBUG) Log.d(TAG, "caught exception looking for maxValidHeight " + e); |
| 353 | } |
| 354 | |
| 355 | a.recycle(); |
| 356 | } |
| 357 | |
| 358 | /** |
| 359 | * Creates a new set of layout parameters with the specified width, height |
| 360 | * and valid height bounds. |
| 361 | * |
| 362 | * @param width the width, either {@link #MATCH_PARENT}, |
| 363 | * {@link #WRAP_CONTENT} or a fixed size in pixels |
| 364 | * @param height the height, either {@link #MATCH_PARENT}, |
| 365 | * {@link #WRAP_CONTENT} or a fixed size in pixels |
| 366 | * @param minHeight the minimum height of this child |
| 367 | * @param maxHeight the maximum height of this child |
| 368 | * or {@link #UNBOUNDED} if the child can grow forever |
| 369 | */ |
| 370 | public LayoutParams(int width, int height, int minHeight, int maxHeight) { |
| 371 | super(width, height); |
| 372 | this.minHeight = minHeight; |
| 373 | this.maxHeight = maxHeight; |
| 374 | } |
| 375 | |
| 376 | /** |
| 377 | * {@inheritDoc} |
| 378 | */ |
| 379 | public LayoutParams(int width, int height) { |
| 380 | this(width, height, UNBOUNDED, UNBOUNDED); |
| 381 | } |
| 382 | |
| 383 | /** |
| 384 | * Constructs a new LayoutParams with default values as defined in {@link LayoutParams}. |
| 385 | */ |
| 386 | public LayoutParams() { |
| 387 | this(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED); |
| 388 | } |
| 389 | |
| 390 | /** |
| 391 | * {@inheritDoc} |
| 392 | */ |
| 393 | public LayoutParams(ViewGroup.LayoutParams p) { |
| 394 | super(p); |
| 395 | minHeight = UNBOUNDED; |
| 396 | maxHeight = UNBOUNDED; |
| 397 | } |
| 398 | |
| 399 | public String debug(String output) { |
| 400 | return output + "SizeAdaptiveLayout.LayoutParams={" + |
| 401 | ", max=" + maxHeight + |
| 402 | ", max=" + minHeight + "}"; |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | class BringToFrontOnEnd implements AnimatorListener { |
| 407 | @Override |
| 408 | public void onAnimationEnd(Animator animation) { |
| 409 | if (mCanceledAnimationCount == 0) { |
| 410 | mLeavingView.setVisibility(View.GONE); |
| 411 | mModestyPanel.setVisibility(View.GONE); |
| 412 | mEnteringView.bringToFront(); |
| 413 | mEnteringView = null; |
| 414 | mLeavingView = null; |
| 415 | } else { |
| 416 | mCanceledAnimationCount--; |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | @Override |
| 421 | public void onAnimationCancel(Animator animation) { |
| 422 | mCanceledAnimationCount++; |
| 423 | } |
| 424 | |
| 425 | @Override |
| 426 | public void onAnimationRepeat(Animator animation) { |
| 427 | if (DEBUG) Log.d(TAG, "fade animation repeated: should never happen."); |
| 428 | assert(false); |
| 429 | } |
| 430 | |
| 431 | @Override |
| 432 | public void onAnimationStart(Animator animation) { |
| 433 | } |
| 434 | } |
| 435 | } |