Daniel Olshansky | 371fcc2 | 2013-07-02 15:12:05 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2013 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.example.android.foldinglayout; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.graphics.Bitmap; |
| 21 | import android.graphics.Canvas; |
| 22 | import android.graphics.Color; |
| 23 | import android.graphics.LinearGradient; |
| 24 | import android.graphics.Matrix; |
| 25 | import android.graphics.Paint; |
| 26 | import android.graphics.Paint.Style; |
| 27 | import android.graphics.Rect; |
| 28 | import android.graphics.Shader.TileMode; |
| 29 | import android.util.AttributeSet; |
| 30 | import android.view.View; |
| 31 | import android.view.ViewGroup; |
| 32 | |
| 33 | /** |
| 34 | * The folding layout where the number of folds, the anchor point and the |
| 35 | * orientation of the fold can be specified. Each of these parameters can |
| 36 | * be modified individually and updates and resets the fold to a default |
| 37 | * (unfolded) state. The fold factor varies between 0 (completely unfolded |
| 38 | * flat image) to 1.0 (completely folded, non-visible image). |
| 39 | * |
| 40 | * This layout throws an exception if there is more than one child added to the view. |
| 41 | * For more complicated view hierarchy's inside the folding layout, the views should all |
| 42 | * be nested inside 1 parent layout. |
| 43 | * |
| 44 | * This layout folds the contents of its child in real time. By applying matrix |
| 45 | * transformations when drawing to canvas, the contents of the child may change as |
| 46 | * the fold takes place. It is important to note that there are jagged edges about |
| 47 | * the perimeter of the layout as a result of applying transformations to a rectangle. |
| 48 | * This can be avoided by having the child of this layout wrap its content inside a |
| 49 | * 1 pixel transparent border. This will cause an anti-aliasing like effect and smoothen |
| 50 | * out the edges. |
| 51 | * |
| 52 | */ |
| 53 | public class FoldingLayout extends ViewGroup { |
| 54 | |
| 55 | public static enum Orientation { |
| 56 | VERTICAL, |
| 57 | HORIZONTAL |
| 58 | } |
| 59 | |
| 60 | private final String FOLDING_VIEW_EXCEPTION_MESSAGE = "Folding Layout can only 1 child at " + |
| 61 | "most"; |
| 62 | |
| 63 | private final float SHADING_ALPHA = 0.8f; |
| 64 | private final float SHADING_FACTOR = 0.5f; |
| 65 | private final int DEPTH_CONSTANT = 1500; |
| 66 | private final int NUM_OF_POLY_POINTS = 8; |
| 67 | |
| 68 | private Rect[] mFoldRectArray; |
| 69 | |
| 70 | private Matrix [] mMatrix; |
| 71 | |
| 72 | private Orientation mOrientation = Orientation.HORIZONTAL; |
| 73 | |
| 74 | private float mAnchorFactor = 0; |
| 75 | private float mFoldFactor = 0; |
| 76 | |
| 77 | private int mNumberOfFolds = 2; |
| 78 | |
| 79 | private boolean mIsHorizontal = true; |
| 80 | |
| 81 | private int mOriginalWidth = 0; |
| 82 | private int mOriginalHeight = 0; |
| 83 | |
| 84 | private float mFoldMaxWidth = 0; |
| 85 | private float mFoldMaxHeight = 0; |
| 86 | private float mFoldDrawWidth = 0; |
| 87 | private float mFoldDrawHeight = 0; |
| 88 | |
| 89 | private boolean mIsFoldPrepared = false; |
| 90 | private boolean mShouldDraw = true; |
| 91 | |
| 92 | private Paint mSolidShadow; |
| 93 | private Paint mGradientShadow; |
| 94 | private LinearGradient mShadowLinearGradient; |
| 95 | private Matrix mShadowGradientMatrix; |
| 96 | |
| 97 | private float [] mSrc; |
| 98 | private float [] mDst; |
| 99 | |
| 100 | private OnFoldListener mFoldListener; |
| 101 | |
| 102 | private float mPreviousFoldFactor = 0; |
| 103 | |
| 104 | private Bitmap mFullBitmap; |
| 105 | private Rect mDstRect; |
| 106 | |
| 107 | public FoldingLayout(Context context) { |
| 108 | super(context); |
| 109 | } |
| 110 | |
| 111 | public FoldingLayout(Context context, AttributeSet attrs) { |
| 112 | super(context, attrs); |
| 113 | } |
| 114 | |
| 115 | public FoldingLayout(Context context, AttributeSet attrs, int defStyle) { |
| 116 | super(context, attrs, defStyle); |
| 117 | } |
| 118 | |
| 119 | @Override |
| 120 | protected boolean addViewInLayout(View child, int index, LayoutParams params, |
| 121 | boolean preventRequestLayout) { |
| 122 | throwCustomException(getChildCount()); |
| 123 | boolean returnValue = super.addViewInLayout(child, index, params, preventRequestLayout); |
| 124 | return returnValue; |
| 125 | } |
| 126 | |
| 127 | @Override |
| 128 | public void addView(View child, int index, LayoutParams params) { |
| 129 | throwCustomException(getChildCount()); |
| 130 | super.addView(child, index, params); |
| 131 | } |
| 132 | |
| 133 | @Override |
| 134 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 135 | View child = getChildAt(0); |
| 136 | measureChild(child,widthMeasureSpec, heightMeasureSpec); |
| 137 | setMeasuredDimension(widthMeasureSpec, heightMeasureSpec); |
| 138 | } |
| 139 | |
| 140 | @Override |
| 141 | protected void onLayout(boolean changed, int l, int t, int r, int b) { |
| 142 | View child = getChildAt(0); |
| 143 | child.layout(0, 0, child.getMeasuredWidth(), child.getMeasuredHeight()); |
| 144 | updateFold(); |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * The custom exception to be thrown so as to limit the number of views in this |
| 149 | * layout to at most one. |
| 150 | */ |
| 151 | private class NumberOfFoldingLayoutChildrenException extends RuntimeException { |
| 152 | public NumberOfFoldingLayoutChildrenException(String message) { |
| 153 | super(message); |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | /** Throws an exception if the number of views added to this layout exceeds one.*/ |
| 158 | private void throwCustomException (int numOfChildViews) { |
| 159 | if (numOfChildViews == 1) { |
| 160 | throw new NumberOfFoldingLayoutChildrenException(FOLDING_VIEW_EXCEPTION_MESSAGE); |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | public void setFoldListener(OnFoldListener foldListener) { |
| 165 | mFoldListener = foldListener; |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * Sets the fold factor of the folding view and updates all the corresponding |
| 170 | * matrices and values to account for the new fold factor. Once that is complete, |
| 171 | * it redraws itself with the new fold. */ |
| 172 | public void setFoldFactor(float foldFactor) { |
| 173 | if (foldFactor != mFoldFactor) { |
| 174 | mFoldFactor = foldFactor; |
| 175 | calculateMatrices(); |
| 176 | invalidate(); |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | public void setOrientation(Orientation orientation) { |
| 181 | if (orientation != mOrientation) { |
| 182 | mOrientation = orientation; |
| 183 | updateFold(); |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | public void setAnchorFactor(float anchorFactor) { |
| 188 | if (anchorFactor != mAnchorFactor) { |
| 189 | mAnchorFactor = anchorFactor; |
| 190 | updateFold(); |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | public void setNumberOfFolds(int numberOfFolds) { |
| 195 | if (numberOfFolds != mNumberOfFolds) { |
| 196 | mNumberOfFolds = numberOfFolds; |
| 197 | updateFold(); |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | public float getAnchorFactor() { |
| 202 | return mAnchorFactor; |
| 203 | } |
| 204 | |
| 205 | public Orientation getOrientation() { |
| 206 | return mOrientation; |
| 207 | } |
| 208 | |
| 209 | public float getFoldFactor() { |
| 210 | return mFoldFactor; |
| 211 | } |
| 212 | |
| 213 | public int getNumberOfFolds() { |
| 214 | return mNumberOfFolds; |
| 215 | } |
| 216 | |
| 217 | private void updateFold() { |
| 218 | prepareFold(mOrientation, mAnchorFactor, mNumberOfFolds); |
| 219 | calculateMatrices(); |
| 220 | invalidate(); |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * This method is called in order to update the fold's orientation, anchor |
| 225 | * point and number of folds. This creates the necessary setup in order to |
| 226 | * prepare the layout for a fold with the specified parameters. Some of the |
| 227 | * dimensions required for the folding transformation are also acquired here. |
| 228 | * |
| 229 | * After this method is called, it will be in a completely unfolded state by default. |
| 230 | */ |
| 231 | private void prepareFold(Orientation orientation, float anchorFactor, int numberOfFolds) { |
| 232 | |
| 233 | mSrc = new float[NUM_OF_POLY_POINTS]; |
| 234 | mDst = new float[NUM_OF_POLY_POINTS]; |
| 235 | |
| 236 | mDstRect = new Rect(); |
| 237 | |
| 238 | mFoldFactor = 0; |
| 239 | mPreviousFoldFactor = 0; |
| 240 | |
| 241 | mIsFoldPrepared = false; |
| 242 | |
| 243 | mSolidShadow = new Paint(); |
| 244 | mGradientShadow = new Paint(); |
| 245 | |
| 246 | mOrientation = orientation; |
| 247 | mIsHorizontal = (orientation == Orientation.HORIZONTAL); |
| 248 | |
| 249 | if (mIsHorizontal) { |
| 250 | mShadowLinearGradient = new LinearGradient(0, 0, SHADING_FACTOR, 0, Color.BLACK, |
| 251 | Color.TRANSPARENT, TileMode.CLAMP); |
| 252 | } else { |
| 253 | mShadowLinearGradient = new LinearGradient(0, 0, 0, SHADING_FACTOR, Color.BLACK, |
| 254 | Color.TRANSPARENT, TileMode.CLAMP); |
| 255 | } |
| 256 | |
| 257 | mGradientShadow.setStyle(Style.FILL); |
| 258 | mGradientShadow.setShader(mShadowLinearGradient); |
| 259 | mShadowGradientMatrix = new Matrix(); |
| 260 | |
| 261 | mAnchorFactor = anchorFactor; |
| 262 | mNumberOfFolds = numberOfFolds; |
| 263 | |
| 264 | mOriginalWidth = getMeasuredWidth(); |
| 265 | mOriginalHeight = getMeasuredHeight(); |
| 266 | |
| 267 | mFoldRectArray = new Rect[mNumberOfFolds]; |
| 268 | mMatrix = new Matrix [mNumberOfFolds]; |
| 269 | |
| 270 | for (int x = 0; x < mNumberOfFolds; x++) { |
| 271 | mMatrix[x] = new Matrix(); |
| 272 | } |
| 273 | |
| 274 | int h = mOriginalHeight; |
| 275 | int w = mOriginalWidth; |
| 276 | |
| 277 | if (FoldingLayoutActivity.IS_JBMR2) { |
| 278 | mFullBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); |
| 279 | Canvas canvas = new Canvas(mFullBitmap); |
| 280 | getChildAt(0).draw(canvas); |
| 281 | } |
| 282 | |
| 283 | int delta = Math.round(mIsHorizontal ? ((float) w) / ((float) mNumberOfFolds) : |
| 284 | ((float) h) /((float) mNumberOfFolds)); |
| 285 | |
| 286 | /* Loops through the number of folds and segments the full layout into a number |
| 287 | * of smaller equal components. If the number of folds is odd, then one of the |
| 288 | * components will be smaller than all the rest. Note that deltap below handles |
| 289 | * the calculation for an odd number of folds.*/ |
| 290 | for (int x = 0; x < mNumberOfFolds; x++) { |
| 291 | if (mIsHorizontal) { |
| 292 | int deltap = (x + 1) * delta > w ? w - x * delta : delta; |
| 293 | mFoldRectArray[x] = new Rect(x * delta, 0, x * delta + deltap, h); |
| 294 | } else { |
| 295 | int deltap = (x + 1) * delta > h ? h - x * delta : delta; |
| 296 | mFoldRectArray[x] = new Rect(0, x * delta, w, x * delta + deltap); |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | if (mIsHorizontal) { |
| 301 | mFoldMaxHeight = h; |
| 302 | mFoldMaxWidth = delta; |
| 303 | } else { |
| 304 | mFoldMaxHeight = delta; |
| 305 | mFoldMaxWidth = w; |
| 306 | } |
| 307 | |
| 308 | mIsFoldPrepared = true; |
| 309 | } |
| 310 | |
| 311 | /* |
| 312 | * Calculates the transformation matrices used to draw each of the separate folding |
| 313 | * segments from this view. |
| 314 | */ |
| 315 | private void calculateMatrices() { |
| 316 | |
| 317 | mShouldDraw = true; |
| 318 | |
| 319 | if (!mIsFoldPrepared) { |
| 320 | return; |
| 321 | } |
| 322 | |
| 323 | /** If the fold factor is 1 than the folding view should not be seen |
| 324 | * and the canvas can be left completely empty. */ |
| 325 | if (mFoldFactor == 1) { |
| 326 | mShouldDraw = false; |
| 327 | return; |
| 328 | } |
| 329 | |
| 330 | if (mFoldFactor == 0 && mPreviousFoldFactor > 0) { |
| 331 | mFoldListener.onEndFold(); |
| 332 | } |
| 333 | |
| 334 | if (mPreviousFoldFactor == 0 && mFoldFactor > 0) { |
| 335 | mFoldListener.onStartFold(); |
| 336 | } |
| 337 | |
| 338 | mPreviousFoldFactor = mFoldFactor; |
| 339 | |
| 340 | /* Reset all the transformation matrices back to identity before computing |
| 341 | * the new transformation */ |
| 342 | for (int x = 0; x < mNumberOfFolds; x++) { |
| 343 | mMatrix[x].reset(); |
| 344 | } |
| 345 | |
| 346 | float cTranslationFactor = 1 - mFoldFactor; |
| 347 | |
| 348 | float translatedDistance = mIsHorizontal ? mOriginalWidth * cTranslationFactor : |
| 349 | mOriginalHeight * cTranslationFactor; |
| 350 | |
| 351 | float translatedDistancePerFold = Math.round(translatedDistance / mNumberOfFolds); |
| 352 | |
| 353 | /* For an odd number of folds, the rounding error may cause the |
| 354 | * translatedDistancePerFold to be grater than the max fold width or height. */ |
| 355 | mFoldDrawWidth = mFoldMaxWidth < translatedDistancePerFold ? |
| 356 | translatedDistancePerFold : mFoldMaxWidth; |
| 357 | mFoldDrawHeight = mFoldMaxHeight < translatedDistancePerFold ? |
| 358 | translatedDistancePerFold : mFoldMaxHeight; |
| 359 | |
| 360 | float translatedDistanceFoldSquared = translatedDistancePerFold * translatedDistancePerFold; |
| 361 | |
| 362 | /* Calculate the depth of the fold into the screen using pythagorean theorem. */ |
| 363 | float depth = mIsHorizontal ? |
| 364 | (float)Math.sqrt((double)(mFoldDrawWidth * mFoldDrawWidth - |
| 365 | translatedDistanceFoldSquared)) : |
| 366 | (float)Math.sqrt((double)(mFoldDrawHeight * mFoldDrawHeight - |
| 367 | translatedDistanceFoldSquared)); |
| 368 | |
| 369 | /* The size of some object is always inversely proportional to the distance |
| 370 | * it is away from the viewpoint. The constant can be varied to to affect the |
| 371 | * amount of perspective. */ |
| 372 | float scaleFactor = DEPTH_CONSTANT / (DEPTH_CONSTANT + depth); |
| 373 | |
| 374 | float scaledWidth, scaledHeight, bottomScaledPoint, topScaledPoint, rightScaledPoint, |
| 375 | leftScaledPoint; |
| 376 | |
| 377 | if (mIsHorizontal) { |
| 378 | scaledWidth = mFoldDrawWidth * cTranslationFactor; |
| 379 | scaledHeight = mFoldDrawHeight * scaleFactor; |
| 380 | } else { |
| 381 | scaledWidth = mFoldDrawWidth * scaleFactor; |
| 382 | scaledHeight = mFoldDrawHeight * cTranslationFactor; |
| 383 | } |
| 384 | |
| 385 | topScaledPoint = (mFoldDrawHeight - scaledHeight) / 2.0f; |
| 386 | bottomScaledPoint = topScaledPoint + scaledHeight; |
| 387 | |
| 388 | leftScaledPoint = (mFoldDrawWidth - scaledWidth) / 2.0f; |
| 389 | rightScaledPoint = leftScaledPoint + scaledWidth; |
| 390 | |
| 391 | float anchorPoint = mIsHorizontal ? mAnchorFactor * mOriginalWidth : |
| 392 | mAnchorFactor * mOriginalHeight; |
| 393 | |
| 394 | /* The fold along which the anchor point is located. */ |
| 395 | float midFold = mIsHorizontal ? (anchorPoint / mFoldDrawWidth) : anchorPoint / |
| 396 | mFoldDrawHeight; |
| 397 | |
| 398 | mSrc[0] = 0; |
| 399 | mSrc[1] = 0; |
| 400 | mSrc[2] = 0; |
| 401 | mSrc[3] = mFoldDrawHeight; |
| 402 | mSrc[4] = mFoldDrawWidth; |
| 403 | mSrc[5] = 0; |
| 404 | mSrc[6] = mFoldDrawWidth; |
| 405 | mSrc[7] = mFoldDrawHeight; |
| 406 | |
| 407 | /* Computes the transformation matrix for each fold using the values calculated above. */ |
| 408 | for (int x = 0; x < mNumberOfFolds; x++) { |
| 409 | |
| 410 | boolean isEven = (x % 2 == 0); |
| 411 | |
| 412 | if (mIsHorizontal) { |
| 413 | mDst[0] = (anchorPoint > x * mFoldDrawWidth) ? anchorPoint + (x - midFold) * |
| 414 | scaledWidth : anchorPoint - (midFold - x) * scaledWidth; |
| 415 | mDst[1] = isEven ? 0 : topScaledPoint; |
| 416 | mDst[2] = mDst[0]; |
| 417 | mDst[3] = isEven ? mFoldDrawHeight: bottomScaledPoint; |
| 418 | mDst[4] = (anchorPoint > (x + 1) * mFoldDrawWidth) ? anchorPoint + (x + 1 - midFold) |
| 419 | * scaledWidth : anchorPoint - (midFold - x - 1) * scaledWidth; |
| 420 | mDst[5] = isEven ? topScaledPoint : 0; |
| 421 | mDst[6] = mDst[4]; |
| 422 | mDst[7] = isEven ? bottomScaledPoint : mFoldDrawHeight; |
| 423 | |
| 424 | } else { |
| 425 | mDst[0] = isEven ? 0 : leftScaledPoint; |
| 426 | mDst[1] = (anchorPoint > x * mFoldDrawHeight) ? anchorPoint + (x - midFold) * |
| 427 | scaledHeight : anchorPoint - (midFold - x) * scaledHeight; |
| 428 | mDst[2] = isEven ? leftScaledPoint: 0; |
| 429 | mDst[3] = (anchorPoint > (x + 1) * mFoldDrawHeight) ? anchorPoint + (x + 1 - |
| 430 | midFold) * scaledHeight : anchorPoint - (midFold - x - 1) * scaledHeight; |
| 431 | mDst[4] = isEven ? mFoldDrawWidth : rightScaledPoint; |
| 432 | mDst[5] = mDst[1]; |
| 433 | mDst[6] = isEven ? rightScaledPoint : mFoldDrawWidth; |
| 434 | mDst[7] = mDst[3]; |
| 435 | } |
| 436 | |
| 437 | /* Pixel fractions are present for odd number of folds which need to be |
| 438 | * rounded off here.*/ |
| 439 | for (int y = 0; y < 8; y ++) { |
| 440 | mDst[y] = Math.round(mDst[y]); |
| 441 | } |
| 442 | |
| 443 | /* If it so happens that any of the folds have reached a point where |
| 444 | * the width or height of that fold is 0, then nothing needs to be |
| 445 | * drawn onto the canvas because the view is essentially completely |
| 446 | * folded.*/ |
| 447 | if (mIsHorizontal) { |
| 448 | if (mDst[4] <= mDst[0] || mDst[6] <= mDst[2]) { |
| 449 | mShouldDraw = false; |
| 450 | return; |
| 451 | } |
| 452 | } else { |
| 453 | if (mDst[3] <= mDst[1] || mDst[7] <= mDst[5]) { |
| 454 | mShouldDraw = false; |
| 455 | return; |
| 456 | } |
| 457 | } |
| 458 | |
| 459 | /* Sets the shadow and bitmap transformation matrices.*/ |
| 460 | mMatrix[x].setPolyToPoly(mSrc, 0, mDst, 0, NUM_OF_POLY_POINTS / 2); |
| 461 | } |
| 462 | /* The shadows on the folds are split into two parts: Solid shadows and gradients. |
| 463 | * Every other fold has a solid shadow which overlays the whole fold. Similarly, |
| 464 | * the folds in between these alternating folds also have an overlaying shadow. |
| 465 | * However, it is a gradient that takes up part of the fold as opposed to a solid |
| 466 | * shadow overlaying the whole fold.*/ |
| 467 | |
| 468 | /* Solid shadow paint object. */ |
| 469 | int alpha = (int) (mFoldFactor * 255 * SHADING_ALPHA); |
| 470 | |
| 471 | mSolidShadow.setColor(Color.argb(alpha, 0, 0, 0)); |
| 472 | |
| 473 | if (mIsHorizontal) { |
| 474 | mShadowGradientMatrix.setScale(mFoldDrawWidth, 1); |
| 475 | mShadowLinearGradient.setLocalMatrix(mShadowGradientMatrix); |
| 476 | } else { |
| 477 | mShadowGradientMatrix.setScale(1, mFoldDrawHeight); |
| 478 | mShadowLinearGradient.setLocalMatrix(mShadowGradientMatrix); |
| 479 | } |
| 480 | |
| 481 | mGradientShadow.setAlpha(alpha); |
| 482 | } |
| 483 | |
| 484 | @Override |
| 485 | protected void dispatchDraw(Canvas canvas) { |
| 486 | /** If prepareFold has not been called or if preparation has not completed yet, |
| 487 | * then no custom drawing will take place so only need to invoke super's |
| 488 | * onDraw and return. */ |
| 489 | if (!mIsFoldPrepared || mFoldFactor == 0) { |
| 490 | super.dispatchDraw(canvas); |
| 491 | return; |
| 492 | } |
| 493 | |
| 494 | if (!mShouldDraw) { |
| 495 | return; |
| 496 | } |
| 497 | |
| 498 | Rect src; |
| 499 | /* Draws the bitmaps and shadows on the canvas with the appropriate transformations. */ |
| 500 | for (int x = 0; x < mNumberOfFolds; x++) { |
| 501 | |
| 502 | src = mFoldRectArray[x]; |
| 503 | /* The canvas is saved and restored for every individual fold*/ |
| 504 | canvas.save(); |
| 505 | |
| 506 | /* Concatenates the canvas with the transformation matrix for the |
| 507 | * the segment of the view corresponding to the actual image being |
| 508 | * displayed. */ |
| 509 | canvas.concat(mMatrix[x]); |
| 510 | if (FoldingLayoutActivity.IS_JBMR2) { |
| 511 | mDstRect.set(0, 0, src.width(), src.height()); |
| 512 | canvas.drawBitmap(mFullBitmap, src, mDstRect, null); |
| 513 | } else { |
| 514 | /* The same transformation matrix is used for both the shadow and the image |
| 515 | * segment. The canvas is clipped to account for the size of each fold and |
| 516 | * is translated so they are drawn in the right place. The shadow is then drawn on |
| 517 | * top of the different folds using the sametransformation matrix.*/ |
| 518 | canvas.clipRect(0, 0, src.right - src.left, src.bottom - src.top); |
| 519 | |
| 520 | if (mIsHorizontal) { |
| 521 | canvas.translate(-src.left, 0); |
| 522 | } else { |
| 523 | canvas.translate(0, -src.top); |
| 524 | } |
| 525 | |
| 526 | super.dispatchDraw(canvas); |
| 527 | |
| 528 | if (mIsHorizontal) { |
| 529 | canvas.translate(src.left, 0); |
| 530 | } else { |
| 531 | canvas.translate(0, src.top); |
| 532 | } |
| 533 | } |
| 534 | /* Draws the shadows corresponding to this specific fold. */ |
| 535 | if (x % 2 == 0) { |
| 536 | canvas.drawRect(0, 0, mFoldDrawWidth, mFoldDrawHeight, mSolidShadow); |
| 537 | } else { |
| 538 | canvas.drawRect(0, 0, mFoldDrawWidth, mFoldDrawHeight, mGradientShadow); |
| 539 | } |
| 540 | |
| 541 | canvas.restore(); |
| 542 | } |
| 543 | } |
| 544 | |
| 545 | } |