Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 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.gallery3d.ui; |
| 18 | |
| 19 | import com.android.gallery3d.anim.Animation; |
| 20 | import com.android.gallery3d.common.Utils; |
| 21 | import com.android.gallery3d.ui.PositionRepository.Position; |
| 22 | import com.android.gallery3d.util.LinkedNode; |
| 23 | |
| 24 | import android.content.Context; |
| 25 | import android.graphics.Rect; |
| 26 | import android.view.GestureDetector; |
| 27 | import android.view.MotionEvent; |
| 28 | import android.view.animation.DecelerateInterpolator; |
| 29 | |
| 30 | import java.util.ArrayList; |
| 31 | import java.util.HashMap; |
| 32 | |
| 33 | public class SlotView extends GLView { |
| 34 | @SuppressWarnings("unused") |
| 35 | private static final String TAG = "SlotView"; |
| 36 | |
| 37 | private static final boolean WIDE = true; |
| 38 | |
| 39 | private static final int INDEX_NONE = -1; |
| 40 | |
| 41 | public interface Listener { |
Chih-Chung Chang | 70a73a7 | 2011-09-19 11:09:39 +0800 | [diff] [blame] | 42 | public void onDown(int index); |
| 43 | public void onUp(); |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 44 | public void onSingleTapUp(int index); |
| 45 | public void onLongTap(int index); |
| 46 | public void onScrollPositionChanged(int position, int total); |
| 47 | } |
| 48 | |
| 49 | public static class SimpleListener implements Listener { |
Chih-Chung Chang | 70a73a7 | 2011-09-19 11:09:39 +0800 | [diff] [blame] | 50 | public void onDown(int index) {} |
| 51 | public void onUp() {} |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 52 | public void onSingleTapUp(int index) {} |
| 53 | public void onLongTap(int index) {} |
| 54 | public void onScrollPositionChanged(int position, int total) {} |
| 55 | } |
| 56 | |
| 57 | private final GestureDetector mGestureDetector; |
| 58 | private final ScrollerHelper mScroller; |
| 59 | private final Paper mPaper = new Paper(); |
| 60 | |
| 61 | private Listener mListener; |
| 62 | private UserInteractionListener mUIListener; |
| 63 | |
| 64 | // Use linked hash map to keep the rendering order |
| 65 | private HashMap<DisplayItem, ItemEntry> mItems = |
| 66 | new HashMap<DisplayItem, ItemEntry>(); |
| 67 | |
| 68 | public LinkedNode.List<ItemEntry> mItemList = LinkedNode.newList(); |
| 69 | |
| 70 | // This is used for multipass rendering |
| 71 | private ArrayList<ItemEntry> mCurrentItems = new ArrayList<ItemEntry>(); |
| 72 | private ArrayList<ItemEntry> mNextItems = new ArrayList<ItemEntry>(); |
| 73 | |
| 74 | private boolean mMoreAnimation = false; |
| 75 | private MyAnimation mAnimation = null; |
| 76 | private final Position mTempPosition = new Position(); |
| 77 | private final Layout mLayout = new Layout(); |
| 78 | private PositionProvider mPositions; |
| 79 | private int mStartIndex = INDEX_NONE; |
| 80 | |
| 81 | // whether the down action happened while the view is scrolling. |
| 82 | private boolean mDownInScrolling; |
| 83 | private int mOverscrollEffect = OVERSCROLL_3D; |
| 84 | |
| 85 | public static final int OVERSCROLL_3D = 0; |
| 86 | public static final int OVERSCROLL_SYSTEM = 1; |
| 87 | public static final int OVERSCROLL_NONE = 2; |
| 88 | |
| 89 | public SlotView(Context context) { |
| 90 | mGestureDetector = |
| 91 | new GestureDetector(context, new MyGestureListener()); |
| 92 | mScroller = new ScrollerHelper(context); |
| 93 | } |
| 94 | |
| 95 | public void setCenterIndex(int index) { |
| 96 | int slotCount = mLayout.mSlotCount; |
| 97 | if (index < 0 || index >= slotCount) { |
| 98 | return; |
| 99 | } |
| 100 | Rect rect = mLayout.getSlotRect(index); |
| 101 | int position = WIDE |
| 102 | ? (rect.left + rect.right - getWidth()) / 2 |
| 103 | : (rect.top + rect.bottom - getHeight()) / 2; |
| 104 | setScrollPosition(position); |
| 105 | } |
| 106 | |
| 107 | public void makeSlotVisible(int index) { |
| 108 | Rect rect = mLayout.getSlotRect(index); |
| 109 | int visibleBegin = WIDE ? mScrollX : mScrollY; |
| 110 | int visibleLength = WIDE ? getWidth() : getHeight(); |
| 111 | int visibleEnd = visibleBegin + visibleLength; |
| 112 | int slotBegin = WIDE ? rect.left : rect.top; |
| 113 | int slotEnd = WIDE ? rect.right : rect.bottom; |
| 114 | |
| 115 | int position = visibleBegin; |
| 116 | if (visibleLength < slotEnd - slotBegin) { |
| 117 | position = visibleBegin; |
| 118 | } else if (slotBegin < visibleBegin) { |
| 119 | position = slotBegin; |
| 120 | } else if (slotEnd > visibleEnd) { |
| 121 | position = slotEnd - visibleLength; |
| 122 | } |
| 123 | |
| 124 | setScrollPosition(position); |
| 125 | } |
| 126 | |
| 127 | public void setScrollPosition(int position) { |
| 128 | position = Utils.clamp(position, 0, mLayout.getScrollLimit()); |
| 129 | mScroller.setPosition(position); |
| 130 | updateScrollPosition(position, false); |
| 131 | } |
| 132 | |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 133 | public void setSlotSpec(Spec spec) { |
| 134 | mLayout.setSlotSpec(spec); |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | @Override |
| 138 | public void addComponent(GLView view) { |
| 139 | throw new UnsupportedOperationException(); |
| 140 | } |
| 141 | |
| 142 | @Override |
| 143 | public boolean removeComponent(GLView view) { |
| 144 | throw new UnsupportedOperationException(); |
| 145 | } |
| 146 | |
| 147 | @Override |
| 148 | protected void onLayout(boolean changeSize, int l, int t, int r, int b) { |
| 149 | if (!changeSize) return; |
| 150 | mLayout.setSize(r - l, b - t); |
| 151 | onLayoutChanged(r - l, b - t); |
| 152 | if (mOverscrollEffect == OVERSCROLL_3D) { |
| 153 | mPaper.setSize(r - l, b - t); |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | protected void onLayoutChanged(int width, int height) { |
| 158 | } |
| 159 | |
| 160 | public void startTransition(PositionProvider position) { |
| 161 | mPositions = position; |
| 162 | mAnimation = new MyAnimation(); |
| 163 | mAnimation.start(); |
| 164 | if (mItems.size() != 0) invalidate(); |
| 165 | } |
| 166 | |
| 167 | public void savePositions(PositionRepository repository) { |
| 168 | repository.clear(); |
| 169 | LinkedNode.List<ItemEntry> list = mItemList; |
| 170 | ItemEntry entry = list.getFirst(); |
| 171 | Position position = new Position(); |
| 172 | while (entry != null) { |
| 173 | position.set(entry.target); |
| 174 | position.x -= mScrollX; |
| 175 | position.y -= mScrollY; |
| 176 | repository.putPosition(entry.item.getIdentity(), position); |
| 177 | entry = list.nextOf(entry); |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | private void updateScrollPosition(int position, boolean force) { |
| 182 | if (!force && (WIDE ? position == mScrollX : position == mScrollY)) return; |
| 183 | if (WIDE) { |
| 184 | mScrollX = position; |
| 185 | } else { |
| 186 | mScrollY = position; |
| 187 | } |
| 188 | mLayout.setScrollPosition(position); |
| 189 | onScrollPositionChanged(position); |
| 190 | } |
| 191 | |
| 192 | protected void onScrollPositionChanged(int newPosition) { |
| 193 | int limit = mLayout.getScrollLimit(); |
| 194 | mListener.onScrollPositionChanged(newPosition, limit); |
| 195 | } |
| 196 | |
| 197 | public void putDisplayItem(Position target, Position base, DisplayItem item) { |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 198 | item.setBox(mLayout.getSlotWidth(), mLayout.getSlotHeight()); |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 199 | ItemEntry entry = new ItemEntry(item, target, base); |
| 200 | mItemList.insertLast(entry); |
| 201 | mItems.put(item, entry); |
| 202 | } |
| 203 | |
| 204 | public void removeDisplayItem(DisplayItem item) { |
| 205 | ItemEntry entry = mItems.remove(item); |
| 206 | if (entry != null) entry.remove(); |
| 207 | } |
| 208 | |
| 209 | public Rect getSlotRect(int slotIndex) { |
| 210 | return mLayout.getSlotRect(slotIndex); |
| 211 | } |
| 212 | |
| 213 | @Override |
| 214 | protected boolean onTouch(MotionEvent event) { |
| 215 | if (mUIListener != null) mUIListener.onUserInteraction(); |
| 216 | mGestureDetector.onTouchEvent(event); |
| 217 | switch (event.getAction()) { |
| 218 | case MotionEvent.ACTION_DOWN: |
| 219 | mDownInScrolling = !mScroller.isFinished(); |
| 220 | mScroller.forceFinished(); |
| 221 | break; |
| 222 | } |
| 223 | return true; |
| 224 | } |
| 225 | |
| 226 | public void setListener(Listener listener) { |
| 227 | mListener = listener; |
| 228 | } |
| 229 | |
| 230 | public void setUserInteractionListener(UserInteractionListener listener) { |
| 231 | mUIListener = listener; |
| 232 | } |
| 233 | |
| 234 | public void setOverscrollEffect(int kind) { |
| 235 | mOverscrollEffect = kind; |
| 236 | mScroller.setOverfling(kind == OVERSCROLL_SYSTEM); |
| 237 | } |
| 238 | |
| 239 | @Override |
| 240 | protected void render(GLCanvas canvas) { |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 241 | super.render(canvas); |
| 242 | |
| 243 | long currentTimeMillis = canvas.currentAnimationTimeMillis(); |
| 244 | boolean more = mScroller.advanceAnimation(currentTimeMillis); |
| 245 | boolean paperActive = (mOverscrollEffect == OVERSCROLL_3D) |
| 246 | && mPaper.advanceAnimation(currentTimeMillis); |
| 247 | updateScrollPosition(mScroller.getPosition(), false); |
| 248 | float interpolate = 1f; |
| 249 | if (mAnimation != null) { |
| 250 | more |= mAnimation.calculate(currentTimeMillis); |
| 251 | interpolate = mAnimation.value; |
| 252 | } |
| 253 | |
| 254 | more |= paperActive; |
| 255 | |
| 256 | if (WIDE) { |
| 257 | canvas.translate(-mScrollX, 0, 0); |
| 258 | } else { |
| 259 | canvas.translate(0, -mScrollY, 0); |
| 260 | } |
| 261 | |
| 262 | LinkedNode.List<ItemEntry> list = mItemList; |
| 263 | for (ItemEntry entry = list.getLast(); entry != null;) { |
| 264 | if (renderItem(canvas, entry, interpolate, 0, paperActive)) { |
| 265 | mCurrentItems.add(entry); |
| 266 | } |
| 267 | entry = list.previousOf(entry); |
| 268 | } |
| 269 | |
| 270 | int pass = 1; |
| 271 | while (!mCurrentItems.isEmpty()) { |
| 272 | for (int i = 0, n = mCurrentItems.size(); i < n; i++) { |
| 273 | ItemEntry entry = mCurrentItems.get(i); |
| 274 | if (renderItem(canvas, entry, interpolate, pass, paperActive)) { |
| 275 | mNextItems.add(entry); |
| 276 | } |
| 277 | } |
| 278 | mCurrentItems.clear(); |
| 279 | // swap mNextItems with mCurrentItems |
| 280 | ArrayList<ItemEntry> tmp = mNextItems; |
| 281 | mNextItems = mCurrentItems; |
| 282 | mCurrentItems = tmp; |
| 283 | pass += 1; |
| 284 | } |
| 285 | |
| 286 | if (WIDE) { |
| 287 | canvas.translate(mScrollX, 0, 0); |
| 288 | } else { |
| 289 | canvas.translate(0, mScrollY, 0); |
| 290 | } |
| 291 | |
| 292 | if (more) invalidate(); |
| 293 | if (mMoreAnimation && !more && mUIListener != null) { |
| 294 | mUIListener.onUserInteractionEnd(); |
| 295 | } |
| 296 | mMoreAnimation = more; |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 297 | } |
| 298 | |
| 299 | private boolean renderItem(GLCanvas canvas, ItemEntry entry, |
| 300 | float interpolate, int pass, boolean paperActive) { |
| 301 | canvas.save(GLCanvas.SAVE_FLAG_ALPHA | GLCanvas.SAVE_FLAG_MATRIX); |
| 302 | Position position = entry.target; |
| 303 | if (mPositions != null) { |
| 304 | position = mTempPosition; |
| 305 | position.set(entry.target); |
| 306 | position.x -= mScrollX; |
| 307 | position.y -= mScrollY; |
| 308 | Position source = mPositions |
| 309 | .getPosition(entry.item.getIdentity(), position); |
| 310 | source.x += mScrollX; |
| 311 | source.y += mScrollY; |
| 312 | position = mTempPosition; |
| 313 | Position.interpolate( |
| 314 | source, entry.target, position, interpolate); |
| 315 | } |
| 316 | canvas.multiplyAlpha(position.alpha); |
| 317 | if (paperActive) { |
| 318 | canvas.multiplyMatrix(mPaper.getTransform( |
| 319 | position, entry.base, mScrollX, mScrollY), 0); |
| 320 | } else { |
| 321 | canvas.translate(position.x, position.y, position.z); |
| 322 | } |
| 323 | canvas.rotate(position.theta, 0, 0, 1); |
| 324 | boolean more = entry.item.render(canvas, pass); |
| 325 | canvas.restore(); |
| 326 | return more; |
| 327 | } |
| 328 | |
| 329 | public static class MyAnimation extends Animation { |
| 330 | public float value; |
| 331 | |
| 332 | public MyAnimation() { |
| 333 | setInterpolator(new DecelerateInterpolator(4)); |
| 334 | setDuration(1500); |
| 335 | } |
| 336 | |
| 337 | @Override |
| 338 | protected void onCalculate(float progress) { |
| 339 | value = progress; |
| 340 | } |
| 341 | } |
| 342 | |
| 343 | private static class ItemEntry extends LinkedNode { |
| 344 | public DisplayItem item; |
| 345 | public Position target; |
| 346 | public Position base; |
| 347 | |
| 348 | public ItemEntry(DisplayItem item, Position target, Position base) { |
| 349 | this.item = item; |
| 350 | this.target = target; |
| 351 | this.base = base; |
| 352 | } |
| 353 | } |
| 354 | |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 355 | // This Spec class is used to specify the size of each slot in the SlotView. |
| 356 | // There are two ways to do it: |
| 357 | // |
| 358 | // (1) Specify slotWidth and slotHeight: they specify the width and height |
| 359 | // of each slot. The number of rows and the gap between slots will be |
| 360 | // determined automatically. |
| 361 | // (2) Specify rowsLand, rowsPort, and slotGap: they specify the number |
| 362 | // of rows in landscape/portrait mode and the gap between slots. The |
| 363 | // width and height of each slot is determined automatically. |
| 364 | // |
| 365 | // The initial value of -1 means they are not specified. |
| 366 | public static class Spec { |
| 367 | public int slotWidth = -1; |
| 368 | public int slotHeight = -1; |
| 369 | |
| 370 | public int rowsLand = -1; |
| 371 | public int rowsPort = -1; |
| 372 | public int slotGap = -1; |
| 373 | |
| 374 | static Spec newWithSize(int width, int height) { |
| 375 | Spec s = new Spec(); |
| 376 | s.slotWidth = width; |
| 377 | s.slotHeight = height; |
| 378 | return s; |
| 379 | } |
| 380 | |
| 381 | static Spec newWithRows(int rowsLand, int rowsPort, int slotGap) { |
| 382 | Spec s = new Spec(); |
| 383 | s.rowsLand = rowsLand; |
| 384 | s.rowsPort = rowsPort; |
| 385 | s.slotGap = slotGap; |
| 386 | return s; |
| 387 | } |
| 388 | } |
| 389 | |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 390 | public static class Layout { |
| 391 | |
| 392 | private int mVisibleStart; |
| 393 | private int mVisibleEnd; |
| 394 | |
| 395 | private int mSlotCount; |
| 396 | private int mSlotWidth; |
| 397 | private int mSlotHeight; |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 398 | private int mSlotGap; |
| 399 | |
| 400 | private Spec mSpec; |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 401 | |
| 402 | private int mWidth; |
| 403 | private int mHeight; |
| 404 | |
| 405 | private int mUnitCount; |
| 406 | private int mContentLength; |
| 407 | private int mScrollPosition; |
| 408 | |
| 409 | private int mVerticalPadding; |
| 410 | private int mHorizontalPadding; |
| 411 | |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 412 | public void setSlotSpec(Spec spec) { |
| 413 | mSpec = spec; |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 414 | } |
| 415 | |
| 416 | public boolean setSlotCount(int slotCount) { |
| 417 | mSlotCount = slotCount; |
| 418 | int hPadding = mHorizontalPadding; |
| 419 | int vPadding = mVerticalPadding; |
| 420 | initLayoutParameters(); |
| 421 | return vPadding != mVerticalPadding || hPadding != mHorizontalPadding; |
| 422 | } |
| 423 | |
| 424 | public Rect getSlotRect(int index) { |
| 425 | int col, row; |
| 426 | if (WIDE) { |
| 427 | col = index / mUnitCount; |
| 428 | row = index - col * mUnitCount; |
| 429 | } else { |
| 430 | row = index / mUnitCount; |
| 431 | col = index - row * mUnitCount; |
| 432 | } |
| 433 | |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 434 | int x = mHorizontalPadding + col * (mSlotWidth + mSlotGap); |
| 435 | int y = mVerticalPadding + row * (mSlotHeight + mSlotGap); |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 436 | return new Rect(x, y, x + mSlotWidth, y + mSlotHeight); |
| 437 | } |
| 438 | |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 439 | public int getSlotWidth() { |
| 440 | return mSlotWidth; |
| 441 | } |
| 442 | |
| 443 | public int getSlotHeight() { |
| 444 | return mSlotHeight; |
| 445 | } |
| 446 | |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 447 | public int getContentLength() { |
| 448 | return mContentLength; |
| 449 | } |
| 450 | |
| 451 | // Calculate |
| 452 | // (1) mUnitCount: the number of slots we can fit into one column (or row). |
| 453 | // (2) mContentLength: the width (or height) we need to display all the |
| 454 | // columns (rows). |
| 455 | // (3) padding[]: the vertical and horizontal padding we need in order |
| 456 | // to put the slots towards to the center of the display. |
| 457 | // |
| 458 | // The "major" direction is the direction the user can scroll. The other |
| 459 | // direction is the "minor" direction. |
| 460 | // |
| 461 | // The comments inside this method are the description when the major |
| 462 | // directon is horizontal (X), and the minor directon is vertical (Y). |
| 463 | private void initLayoutParameters( |
| 464 | int majorLength, int minorLength, /* The view width and height */ |
| 465 | int majorUnitSize, int minorUnitSize, /* The slot width and height */ |
| 466 | int[] padding) { |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 467 | int unitCount = (minorLength + mSlotGap) / (minorUnitSize + mSlotGap); |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 468 | if (unitCount == 0) unitCount = 1; |
| 469 | mUnitCount = unitCount; |
| 470 | |
| 471 | // We put extra padding above and below the column. |
| 472 | int availableUnits = Math.min(mUnitCount, mSlotCount); |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 473 | int usedMinorLength = availableUnits * minorUnitSize + |
| 474 | (availableUnits - 1) * mSlotGap; |
| 475 | padding[0] = (minorLength - usedMinorLength) / 2; |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 476 | |
| 477 | // Then calculate how many columns we need for all slots. |
| 478 | int count = ((mSlotCount + mUnitCount - 1) / mUnitCount); |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 479 | mContentLength = count * majorUnitSize + (count - 1) * mSlotGap; |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 480 | |
| 481 | // If the content length is less then the screen width, put |
| 482 | // extra padding in left and right. |
| 483 | padding[1] = Math.max(0, (majorLength - mContentLength) / 2); |
| 484 | } |
| 485 | |
| 486 | private void initLayoutParameters() { |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 487 | // Initialize mSlotWidth and mSlotHeight from mSpec |
| 488 | if (mSpec.slotWidth != -1) { |
| 489 | mSlotGap = 0; |
| 490 | mSlotWidth = mSpec.slotWidth; |
| 491 | mSlotHeight = mSpec.slotHeight; |
| 492 | } else { |
| 493 | int rows = (mWidth > mHeight) ? mSpec.rowsLand : mSpec.rowsPort; |
| 494 | mSlotGap = mSpec.slotGap; |
| 495 | mSlotHeight = Math.max(1, (mHeight - (rows - 1) * mSlotGap) / rows); |
| 496 | mSlotWidth = mSlotHeight; |
| 497 | } |
| 498 | |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 499 | int[] padding = new int[2]; |
| 500 | if (WIDE) { |
| 501 | initLayoutParameters(mWidth, mHeight, mSlotWidth, mSlotHeight, padding); |
| 502 | mVerticalPadding = padding[0]; |
| 503 | mHorizontalPadding = padding[1]; |
| 504 | } else { |
| 505 | initLayoutParameters(mHeight, mWidth, mSlotHeight, mSlotWidth, padding); |
| 506 | mVerticalPadding = padding[1]; |
| 507 | mHorizontalPadding = padding[0]; |
| 508 | } |
| 509 | updateVisibleSlotRange(); |
| 510 | } |
| 511 | |
| 512 | public void setSize(int width, int height) { |
| 513 | mWidth = width; |
| 514 | mHeight = height; |
| 515 | initLayoutParameters(); |
| 516 | } |
| 517 | |
| 518 | private void updateVisibleSlotRange() { |
| 519 | int position = mScrollPosition; |
| 520 | |
| 521 | if (WIDE) { |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 522 | int startCol = position / (mSlotWidth + mSlotGap); |
| 523 | int start = Math.max(0, mUnitCount * startCol); |
| 524 | int endCol = (position + mWidth + mSlotWidth + mSlotGap - 1) / |
| 525 | (mSlotWidth + mSlotGap); |
| 526 | int end = Math.min(mSlotCount, mUnitCount * endCol); |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 527 | setVisibleRange(start, end); |
| 528 | } else { |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 529 | int startRow = position / (mSlotHeight + mSlotGap); |
| 530 | int start = Math.max(0, mUnitCount * startRow); |
| 531 | int endRow = (position + mHeight + mSlotHeight + mSlotGap - 1) / |
| 532 | (mSlotHeight + mSlotGap); |
| 533 | int end = Math.min(mSlotCount, mUnitCount * endRow); |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 534 | setVisibleRange(start, end); |
| 535 | } |
| 536 | } |
| 537 | |
| 538 | public void setScrollPosition(int position) { |
| 539 | if (mScrollPosition == position) return; |
| 540 | mScrollPosition = position; |
| 541 | updateVisibleSlotRange(); |
| 542 | } |
| 543 | |
| 544 | private void setVisibleRange(int start, int end) { |
| 545 | if (start == mVisibleStart && end == mVisibleEnd) return; |
| 546 | if (start < end) { |
| 547 | mVisibleStart = start; |
| 548 | mVisibleEnd = end; |
| 549 | } else { |
| 550 | mVisibleStart = mVisibleEnd = 0; |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | public int getVisibleStart() { |
| 555 | return mVisibleStart; |
| 556 | } |
| 557 | |
| 558 | public int getVisibleEnd() { |
| 559 | return mVisibleEnd; |
| 560 | } |
| 561 | |
| 562 | public int getSlotIndexByPosition(float x, float y) { |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 563 | int absoluteX = Math.round(x) + (WIDE ? mScrollPosition : 0); |
| 564 | int absoluteY = Math.round(y) + (WIDE ? 0 : mScrollPosition); |
| 565 | |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 566 | absoluteX -= mHorizontalPadding; |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 567 | absoluteY -= mVerticalPadding; |
| 568 | |
| 569 | int columnIdx = absoluteX / (mSlotWidth + mSlotGap); |
| 570 | int rowIdx = absoluteY / (mSlotHeight + mSlotGap); |
| 571 | |
| 572 | if (columnIdx < 0 || (!WIDE && columnIdx >= mUnitCount)) { |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 573 | return INDEX_NONE; |
| 574 | } |
| 575 | |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 576 | if (rowIdx < 0 || (WIDE && rowIdx >= mUnitCount)) { |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 577 | return INDEX_NONE; |
| 578 | } |
Chih-Chung Chang | 07069de | 2011-09-14 20:50:28 +0800 | [diff] [blame] | 579 | |
| 580 | if (absoluteX % (mSlotWidth + mSlotGap) >= mSlotWidth) { |
| 581 | return INDEX_NONE; |
| 582 | } |
| 583 | |
| 584 | if (absoluteY % (mSlotHeight + mSlotGap) >= mSlotHeight) { |
| 585 | return INDEX_NONE; |
| 586 | } |
| 587 | |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 588 | int index = WIDE |
| 589 | ? (columnIdx * mUnitCount + rowIdx) |
| 590 | : (rowIdx * mUnitCount + columnIdx); |
| 591 | |
| 592 | return index >= mSlotCount ? INDEX_NONE : index; |
| 593 | } |
| 594 | |
| 595 | public int getScrollLimit() { |
| 596 | int limit = WIDE ? mContentLength - mWidth : mContentLength - mHeight; |
| 597 | return limit <= 0 ? 0 : limit; |
| 598 | } |
| 599 | } |
| 600 | |
Chih-Chung Chang | 70a73a7 | 2011-09-19 11:09:39 +0800 | [diff] [blame] | 601 | private class MyGestureListener implements |
| 602 | GestureDetector.OnGestureListener { |
| 603 | private boolean isDown; |
| 604 | |
| 605 | // We call the listener's onDown() when our onShowPress() is called and |
| 606 | // call the listener's onUp() when we receive any further event. |
| 607 | @Override |
| 608 | public void onShowPress(MotionEvent e) { |
| 609 | if (isDown) return; |
| 610 | int index = mLayout.getSlotIndexByPosition(e.getX(), e.getY()); |
| 611 | if (index != INDEX_NONE) { |
| 612 | isDown = true; |
| 613 | mListener.onDown(index); |
| 614 | } |
| 615 | } |
| 616 | |
| 617 | private void cancelDown() { |
| 618 | if (!isDown) return; |
| 619 | isDown = false; |
| 620 | mListener.onUp(); |
| 621 | } |
| 622 | |
| 623 | @Override |
| 624 | public boolean onDown(MotionEvent e) { |
| 625 | return false; |
| 626 | } |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 627 | |
| 628 | @Override |
| 629 | public boolean onFling(MotionEvent e1, |
| 630 | MotionEvent e2, float velocityX, float velocityY) { |
Chih-Chung Chang | 70a73a7 | 2011-09-19 11:09:39 +0800 | [diff] [blame] | 631 | cancelDown(); |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 632 | int scrollLimit = mLayout.getScrollLimit(); |
| 633 | if (scrollLimit == 0) return false; |
| 634 | float velocity = WIDE ? velocityX : velocityY; |
| 635 | mScroller.fling((int) -velocity, 0, scrollLimit); |
| 636 | if (mUIListener != null) mUIListener.onUserInteractionBegin(); |
| 637 | invalidate(); |
| 638 | return true; |
| 639 | } |
| 640 | |
| 641 | @Override |
| 642 | public boolean onScroll(MotionEvent e1, |
| 643 | MotionEvent e2, float distanceX, float distanceY) { |
Chih-Chung Chang | 70a73a7 | 2011-09-19 11:09:39 +0800 | [diff] [blame] | 644 | cancelDown(); |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 645 | float distance = WIDE ? distanceX : distanceY; |
| 646 | boolean canMove = mScroller.startScroll( |
| 647 | Math.round(distance), 0, mLayout.getScrollLimit()); |
| 648 | if (mOverscrollEffect == OVERSCROLL_3D && !canMove) { |
| 649 | mPaper.overScroll(distance); |
| 650 | } |
| 651 | invalidate(); |
| 652 | return true; |
| 653 | } |
| 654 | |
| 655 | @Override |
| 656 | public boolean onSingleTapUp(MotionEvent e) { |
Chih-Chung Chang | 70a73a7 | 2011-09-19 11:09:39 +0800 | [diff] [blame] | 657 | cancelDown(); |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 658 | if (mDownInScrolling) return true; |
| 659 | int index = mLayout.getSlotIndexByPosition(e.getX(), e.getY()); |
| 660 | if (index != INDEX_NONE) mListener.onSingleTapUp(index); |
| 661 | return true; |
| 662 | } |
| 663 | |
| 664 | @Override |
| 665 | public void onLongPress(MotionEvent e) { |
Chih-Chung Chang | 70a73a7 | 2011-09-19 11:09:39 +0800 | [diff] [blame] | 666 | cancelDown(); |
Owen Lin | a2fba68 | 2011-08-17 22:07:43 +0800 | [diff] [blame] | 667 | if (mDownInScrolling) return; |
| 668 | lockRendering(); |
| 669 | try { |
| 670 | int index = mLayout.getSlotIndexByPosition(e.getX(), e.getY()); |
| 671 | if (index != INDEX_NONE) mListener.onLongTap(index); |
| 672 | } finally { |
| 673 | unlockRendering(); |
| 674 | } |
| 675 | } |
| 676 | } |
| 677 | |
| 678 | public void setStartIndex(int index) { |
| 679 | mStartIndex = index; |
| 680 | } |
| 681 | |
| 682 | // Return true if the layout parameters have been changed |
| 683 | public boolean setSlotCount(int slotCount) { |
| 684 | boolean changed = mLayout.setSlotCount(slotCount); |
| 685 | |
| 686 | // mStartIndex is applied the first time setSlotCount is called. |
| 687 | if (mStartIndex != INDEX_NONE) { |
| 688 | setCenterIndex(mStartIndex); |
| 689 | mStartIndex = INDEX_NONE; |
| 690 | } |
| 691 | updateScrollPosition(WIDE ? mScrollX : mScrollY, true); |
| 692 | return changed; |
| 693 | } |
| 694 | |
| 695 | public int getVisibleStart() { |
| 696 | return mLayout.getVisibleStart(); |
| 697 | } |
| 698 | |
| 699 | public int getVisibleEnd() { |
| 700 | return mLayout.getVisibleEnd(); |
| 701 | } |
| 702 | |
| 703 | public int getScrollX() { |
| 704 | return mScrollX; |
| 705 | } |
| 706 | |
| 707 | public int getScrollY() { |
| 708 | return mScrollY; |
| 709 | } |
| 710 | } |