SlidingPaneLayout.java revision 7099553551ccfc346e22843e0541ed4393c9c4ed
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 17package android.support.v4.widget; 18 19import android.content.Context; 20import android.content.res.TypedArray; 21import android.graphics.Bitmap; 22import android.graphics.Canvas; 23import android.graphics.Paint; 24import android.graphics.PixelFormat; 25import android.graphics.PorterDuff; 26import android.graphics.PorterDuffColorFilter; 27import android.graphics.Rect; 28import android.graphics.drawable.Drawable; 29import android.os.Build; 30import android.os.Parcel; 31import android.os.Parcelable; 32import android.support.annotation.DrawableRes; 33import android.support.v4.view.AccessibilityDelegateCompat; 34import android.support.v4.view.MotionEventCompat; 35import android.support.v4.view.ViewCompat; 36import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat; 37import android.util.AttributeSet; 38import android.util.Log; 39import android.view.MotionEvent; 40import android.view.View; 41import android.view.ViewConfiguration; 42import android.view.ViewGroup; 43import android.view.ViewParent; 44import android.view.accessibility.AccessibilityEvent; 45 46import java.lang.reflect.Field; 47import java.lang.reflect.Method; 48import java.util.ArrayList; 49 50/** 51 * SlidingPaneLayout provides a horizontal, multi-pane layout for use at the top level 52 * of a UI. A left (or first) pane is treated as a content list or browser, subordinate to a 53 * primary detail view for displaying content. 54 * 55 * <p>Child views may overlap if their combined width exceeds the available width 56 * in the SlidingPaneLayout. When this occurs the user may slide the topmost view out of the way 57 * by dragging it, or by navigating in the direction of the overlapped view using a keyboard. 58 * If the content of the dragged child view is itself horizontally scrollable, the user may 59 * grab it by the very edge.</p> 60 * 61 * <p>Thanks to this sliding behavior, SlidingPaneLayout may be suitable for creating layouts 62 * that can smoothly adapt across many different screen sizes, expanding out fully on larger 63 * screens and collapsing on smaller screens.</p> 64 * 65 * <p>SlidingPaneLayout is distinct from a navigation drawer as described in the design 66 * guide and should not be used in the same scenarios. SlidingPaneLayout should be thought 67 * of only as a way to allow a two-pane layout normally used on larger screens to adapt to smaller 68 * screens in a natural way. The interaction patterns expressed by SlidingPaneLayout imply 69 * a physicality and direct information hierarchy between panes that does not necessarily exist 70 * in a scenario where a navigation drawer should be used instead.</p> 71 * 72 * <p>Appropriate uses of SlidingPaneLayout include pairings of panes such as a contact list and 73 * subordinate interactions with those contacts, or an email thread list with the content pane 74 * displaying the contents of the selected thread. Inappropriate uses of SlidingPaneLayout include 75 * switching between disparate functions of your app, such as jumping from a social stream view 76 * to a view of your personal profile - cases such as this should use the navigation drawer 77 * pattern instead. ({@link DrawerLayout DrawerLayout} implements this pattern.)</p> 78 * 79 * <p>Like {@link android.widget.LinearLayout LinearLayout}, SlidingPaneLayout supports 80 * the use of the layout parameter <code>layout_weight</code> on child views to determine 81 * how to divide leftover space after measurement is complete. It is only relevant for width. 82 * When views do not overlap weight behaves as it does in a LinearLayout.</p> 83 * 84 * <p>When views do overlap, weight on a slideable pane indicates that the pane should be 85 * sized to fill all available space in the closed state. Weight on a pane that becomes covered 86 * indicates that the pane should be sized to fill all available space except a small minimum strip 87 * that the user may use to grab the slideable view and pull it back over into a closed state.</p> 88 */ 89public class SlidingPaneLayout extends ViewGroup { 90 private static final String TAG = "SlidingPaneLayout"; 91 92 /** 93 * Default size of the overhang for a pane in the open state. 94 * At least this much of a sliding pane will remain visible. 95 * This indicates that there is more content available and provides 96 * a "physical" edge to grab to pull it closed. 97 */ 98 private static final int DEFAULT_OVERHANG_SIZE = 32; // dp; 99 100 /** 101 * If no fade color is given by default it will fade to 80% gray. 102 */ 103 private static final int DEFAULT_FADE_COLOR = 0xcccccccc; 104 105 /** 106 * The fade color used for the sliding panel. 0 = no fading. 107 */ 108 private int mSliderFadeColor = DEFAULT_FADE_COLOR; 109 110 /** 111 * Minimum velocity that will be detected as a fling 112 */ 113 private static final int MIN_FLING_VELOCITY = 400; // dips per second 114 115 /** 116 * The fade color used for the panel covered by the slider. 0 = no fading. 117 */ 118 private int mCoveredFadeColor; 119 120 /** 121 * Drawable used to draw the shadow between panes by default. 122 */ 123 private Drawable mShadowDrawableLeft; 124 125 /** 126 * Drawable used to draw the shadow between panes to support RTL (right to left language). 127 */ 128 private Drawable mShadowDrawableRight; 129 130 /** 131 * The size of the overhang in pixels. 132 * This is the minimum section of the sliding panel that will 133 * be visible in the open state to allow for a closing drag. 134 */ 135 private final int mOverhangSize; 136 137 /** 138 * True if a panel can slide with the current measurements 139 */ 140 private boolean mCanSlide; 141 142 /** 143 * The child view that can slide, if any. 144 */ 145 private View mSlideableView; 146 147 /** 148 * How far the panel is offset from its closed position. 149 * range [0, 1] where 0 = closed, 1 = open. 150 */ 151 private float mSlideOffset; 152 153 /** 154 * How far the non-sliding panel is parallaxed from its usual position when open. 155 * range [0, 1] 156 */ 157 private float mParallaxOffset; 158 159 /** 160 * How far in pixels the slideable panel may move. 161 */ 162 private int mSlideRange; 163 164 /** 165 * A panel view is locked into internal scrolling or another condition that 166 * is preventing a drag. 167 */ 168 private boolean mIsUnableToDrag; 169 170 /** 171 * Distance in pixels to parallax the fixed pane by when fully closed 172 */ 173 private int mParallaxBy; 174 175 private float mInitialMotionX; 176 private float mInitialMotionY; 177 178 private PanelSlideListener mPanelSlideListener; 179 180 private final ViewDragHelper mDragHelper; 181 182 /** 183 * Stores whether or not the pane was open the last time it was slideable. 184 * If open/close operations are invoked this state is modified. Used by 185 * instance state save/restore. 186 */ 187 private boolean mPreservedOpenState; 188 private boolean mFirstLayout = true; 189 190 private final Rect mTmpRect = new Rect(); 191 192 private final ArrayList<DisableLayerRunnable> mPostedRunnables = 193 new ArrayList<DisableLayerRunnable>(); 194 195 static final SlidingPanelLayoutImpl IMPL; 196 197 static { 198 final int deviceVersion = Build.VERSION.SDK_INT; 199 if (deviceVersion >= 17) { 200 IMPL = new SlidingPanelLayoutImplJBMR1(); 201 } else if (deviceVersion >= 16) { 202 IMPL = new SlidingPanelLayoutImplJB(); 203 } else { 204 IMPL = new SlidingPanelLayoutImplBase(); 205 } 206 } 207 208 /** 209 * Listener for monitoring events about sliding panes. 210 */ 211 public interface PanelSlideListener { 212 /** 213 * Called when a sliding pane's position changes. 214 * @param panel The child view that was moved 215 * @param slideOffset The new offset of this sliding pane within its range, from 0-1 216 */ 217 public void onPanelSlide(View panel, float slideOffset); 218 /** 219 * Called when a sliding pane becomes slid completely open. The pane may or may not 220 * be interactive at this point depending on how much of the pane is visible. 221 * @param panel The child view that was slid to an open position, revealing other panes 222 */ 223 public void onPanelOpened(View panel); 224 225 /** 226 * Called when a sliding pane becomes slid completely closed. The pane is now guaranteed 227 * to be interactive. It may now obscure other views in the layout. 228 * @param panel The child view that was slid to a closed position 229 */ 230 public void onPanelClosed(View panel); 231 } 232 233 /** 234 * No-op stubs for {@link PanelSlideListener}. If you only want to implement a subset 235 * of the listener methods you can extend this instead of implement the full interface. 236 */ 237 public static class SimplePanelSlideListener implements PanelSlideListener { 238 @Override 239 public void onPanelSlide(View panel, float slideOffset) { 240 } 241 @Override 242 public void onPanelOpened(View panel) { 243 } 244 @Override 245 public void onPanelClosed(View panel) { 246 } 247 } 248 249 public SlidingPaneLayout(Context context) { 250 this(context, null); 251 } 252 253 public SlidingPaneLayout(Context context, AttributeSet attrs) { 254 this(context, attrs, 0); 255 } 256 257 public SlidingPaneLayout(Context context, AttributeSet attrs, int defStyle) { 258 super(context, attrs, defStyle); 259 260 final float density = context.getResources().getDisplayMetrics().density; 261 mOverhangSize = (int) (DEFAULT_OVERHANG_SIZE * density + 0.5f); 262 263 final ViewConfiguration viewConfig = ViewConfiguration.get(context); 264 265 setWillNotDraw(false); 266 267 ViewCompat.setAccessibilityDelegate(this, new AccessibilityDelegate()); 268 ViewCompat.setImportantForAccessibility(this, ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES); 269 270 mDragHelper = ViewDragHelper.create(this, 0.5f, new DragHelperCallback()); 271 mDragHelper.setMinVelocity(MIN_FLING_VELOCITY * density); 272 } 273 274 /** 275 * Set a distance to parallax the lower pane by when the upper pane is in its 276 * fully closed state. The lower pane will scroll between this position and 277 * its fully open state. 278 * 279 * @param parallaxBy Distance to parallax by in pixels 280 */ 281 public void setParallaxDistance(int parallaxBy) { 282 mParallaxBy = parallaxBy; 283 requestLayout(); 284 } 285 286 /** 287 * @return The distance the lower pane will parallax by when the upper pane is fully closed. 288 * 289 * @see #setParallaxDistance(int) 290 */ 291 public int getParallaxDistance() { 292 return mParallaxBy; 293 } 294 295 /** 296 * Set the color used to fade the sliding pane out when it is slid most of the way offscreen. 297 * 298 * @param color An ARGB-packed color value 299 */ 300 public void setSliderFadeColor(int color) { 301 mSliderFadeColor = color; 302 } 303 304 /** 305 * @return The ARGB-packed color value used to fade the sliding pane 306 */ 307 public int getSliderFadeColor() { 308 return mSliderFadeColor; 309 } 310 311 /** 312 * Set the color used to fade the pane covered by the sliding pane out when the pane 313 * will become fully covered in the closed state. 314 * 315 * @param color An ARGB-packed color value 316 */ 317 public void setCoveredFadeColor(int color) { 318 mCoveredFadeColor = color; 319 } 320 321 /** 322 * @return The ARGB-packed color value used to fade the fixed pane 323 */ 324 public int getCoveredFadeColor() { 325 return mCoveredFadeColor; 326 } 327 328 public void setPanelSlideListener(PanelSlideListener listener) { 329 mPanelSlideListener = listener; 330 } 331 332 void dispatchOnPanelSlide(View panel) { 333 if (mPanelSlideListener != null) { 334 mPanelSlideListener.onPanelSlide(panel, mSlideOffset); 335 } 336 } 337 338 void dispatchOnPanelOpened(View panel) { 339 if (mPanelSlideListener != null) { 340 mPanelSlideListener.onPanelOpened(panel); 341 } 342 sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED); 343 } 344 345 void dispatchOnPanelClosed(View panel) { 346 if (mPanelSlideListener != null) { 347 mPanelSlideListener.onPanelClosed(panel); 348 } 349 sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED); 350 } 351 352 void updateObscuredViewsVisibility(View panel) { 353 final boolean isLayoutRtl = isLayoutRtlSupport(); 354 final int startBound = isLayoutRtl ? (getWidth() - getPaddingRight()) : 355 getPaddingLeft(); 356 final int endBound = isLayoutRtl ? getPaddingLeft() : 357 (getWidth() - getPaddingRight()); 358 final int topBound = getPaddingTop(); 359 final int bottomBound = getHeight() - getPaddingBottom(); 360 final int left; 361 final int right; 362 final int top; 363 final int bottom; 364 if (panel != null && viewIsOpaque(panel)) { 365 left = panel.getLeft(); 366 right = panel.getRight(); 367 top = panel.getTop(); 368 bottom = panel.getBottom(); 369 } else { 370 left = right = top = bottom = 0; 371 } 372 373 for (int i = 0, childCount = getChildCount(); i < childCount; i++) { 374 final View child = getChildAt(i); 375 376 if (child == panel) { 377 // There are still more children above the panel but they won't be affected. 378 break; 379 } 380 381 final int clampedChildLeft = Math.max((isLayoutRtl ? endBound : 382 startBound), child.getLeft()); 383 final int clampedChildTop = Math.max(topBound, child.getTop()); 384 final int clampedChildRight = Math.min((isLayoutRtl ? startBound : 385 endBound), child.getRight()); 386 final int clampedChildBottom = Math.min(bottomBound, child.getBottom()); 387 final int vis; 388 if (clampedChildLeft >= left && clampedChildTop >= top && 389 clampedChildRight <= right && clampedChildBottom <= bottom) { 390 vis = INVISIBLE; 391 } else { 392 vis = VISIBLE; 393 } 394 child.setVisibility(vis); 395 } 396 } 397 398 void setAllChildrenVisible() { 399 for (int i = 0, childCount = getChildCount(); i < childCount; i++) { 400 final View child = getChildAt(i); 401 if (child.getVisibility() == INVISIBLE) { 402 child.setVisibility(VISIBLE); 403 } 404 } 405 } 406 407 private static boolean viewIsOpaque(View v) { 408 if (ViewCompat.isOpaque(v)) return true; 409 410 // View#isOpaque didn't take all valid opaque scrollbar modes into account 411 // before API 18 (JB-MR2). On newer devices rely solely on isOpaque above and return false 412 // here. On older devices, check the view's background drawable directly as a fallback. 413 if (Build.VERSION.SDK_INT >= 18) return false; 414 415 final Drawable bg = v.getBackground(); 416 if (bg != null) { 417 return bg.getOpacity() == PixelFormat.OPAQUE; 418 } 419 return false; 420 } 421 422 @Override 423 protected void onAttachedToWindow() { 424 super.onAttachedToWindow(); 425 mFirstLayout = true; 426 } 427 428 @Override 429 protected void onDetachedFromWindow() { 430 super.onDetachedFromWindow(); 431 mFirstLayout = true; 432 433 for (int i = 0, count = mPostedRunnables.size(); i < count; i++) { 434 final DisableLayerRunnable dlr = mPostedRunnables.get(i); 435 dlr.run(); 436 } 437 mPostedRunnables.clear(); 438 } 439 440 @Override 441 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 442 int widthMode = MeasureSpec.getMode(widthMeasureSpec); 443 int widthSize = MeasureSpec.getSize(widthMeasureSpec); 444 int heightMode = MeasureSpec.getMode(heightMeasureSpec); 445 int heightSize = MeasureSpec.getSize(heightMeasureSpec); 446 447 if (widthMode != MeasureSpec.EXACTLY) { 448 if (isInEditMode()) { 449 // Don't crash the layout editor. Consume all of the space if specified 450 // or pick a magic number from thin air otherwise. 451 // TODO Better communication with tools of this bogus state. 452 // It will crash on a real device. 453 if (widthMode == MeasureSpec.AT_MOST) { 454 widthMode = MeasureSpec.EXACTLY; 455 } else if (widthMode == MeasureSpec.UNSPECIFIED) { 456 widthMode = MeasureSpec.EXACTLY; 457 widthSize = 300; 458 } 459 } else { 460 throw new IllegalStateException("Width must have an exact value or MATCH_PARENT"); 461 } 462 } else if (heightMode == MeasureSpec.UNSPECIFIED) { 463 if (isInEditMode()) { 464 // Don't crash the layout editor. Pick a magic number from thin air instead. 465 // TODO Better communication with tools of this bogus state. 466 // It will crash on a real device. 467 if (heightMode == MeasureSpec.UNSPECIFIED) { 468 heightMode = MeasureSpec.AT_MOST; 469 heightSize = 300; 470 } 471 } else { 472 throw new IllegalStateException("Height must not be UNSPECIFIED"); 473 } 474 } 475 476 int layoutHeight = 0; 477 int maxLayoutHeight = -1; 478 switch (heightMode) { 479 case MeasureSpec.EXACTLY: 480 layoutHeight = maxLayoutHeight = heightSize - getPaddingTop() - getPaddingBottom(); 481 break; 482 case MeasureSpec.AT_MOST: 483 maxLayoutHeight = heightSize - getPaddingTop() - getPaddingBottom(); 484 break; 485 } 486 487 float weightSum = 0; 488 boolean canSlide = false; 489 int widthRemaining = widthSize - getPaddingLeft() - getPaddingRight(); 490 final int childCount = getChildCount(); 491 492 if (childCount > 2) { 493 Log.e(TAG, "onMeasure: More than two child views are not supported."); 494 } 495 496 // We'll find the current one below. 497 mSlideableView = null; 498 499 // First pass. Measure based on child LayoutParams width/height. 500 // Weight will incur a second pass. 501 for (int i = 0; i < childCount; i++) { 502 final View child = getChildAt(i); 503 final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 504 505 if (child.getVisibility() == GONE) { 506 lp.dimWhenOffset = false; 507 continue; 508 } 509 510 if (lp.weight > 0) { 511 weightSum += lp.weight; 512 513 // If we have no width, weight is the only contributor to the final size. 514 // Measure this view on the weight pass only. 515 if (lp.width == 0) continue; 516 } 517 518 int childWidthSpec; 519 final int horizontalMargin = lp.leftMargin + lp.rightMargin; 520 if (lp.width == LayoutParams.WRAP_CONTENT) { 521 childWidthSpec = MeasureSpec.makeMeasureSpec(widthSize - horizontalMargin, 522 MeasureSpec.AT_MOST); 523 } else if (lp.width == LayoutParams.FILL_PARENT) { 524 childWidthSpec = MeasureSpec.makeMeasureSpec(widthSize - horizontalMargin, 525 MeasureSpec.EXACTLY); 526 } else { 527 childWidthSpec = MeasureSpec.makeMeasureSpec(lp.width, MeasureSpec.EXACTLY); 528 } 529 530 int childHeightSpec; 531 if (lp.height == LayoutParams.WRAP_CONTENT) { 532 childHeightSpec = MeasureSpec.makeMeasureSpec(maxLayoutHeight, MeasureSpec.AT_MOST); 533 } else if (lp.height == LayoutParams.FILL_PARENT) { 534 childHeightSpec = MeasureSpec.makeMeasureSpec(maxLayoutHeight, MeasureSpec.EXACTLY); 535 } else { 536 childHeightSpec = MeasureSpec.makeMeasureSpec(lp.height, MeasureSpec.EXACTLY); 537 } 538 539 child.measure(childWidthSpec, childHeightSpec); 540 final int childWidth = child.getMeasuredWidth(); 541 final int childHeight = child.getMeasuredHeight(); 542 543 if (heightMode == MeasureSpec.AT_MOST && childHeight > layoutHeight) { 544 layoutHeight = Math.min(childHeight, maxLayoutHeight); 545 } 546 547 widthRemaining -= childWidth; 548 canSlide |= lp.slideable = widthRemaining < 0; 549 if (lp.slideable) { 550 mSlideableView = child; 551 } 552 } 553 554 // Resolve weight and make sure non-sliding panels are smaller than the full screen. 555 if (canSlide || weightSum > 0) { 556 final int fixedPanelWidthLimit = widthSize - mOverhangSize; 557 558 for (int i = 0; i < childCount; i++) { 559 final View child = getChildAt(i); 560 561 if (child.getVisibility() == GONE) { 562 continue; 563 } 564 565 final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 566 567 if (child.getVisibility() == GONE) { 568 continue; 569 } 570 571 final boolean skippedFirstPass = lp.width == 0 && lp.weight > 0; 572 final int measuredWidth = skippedFirstPass ? 0 : child.getMeasuredWidth(); 573 if (canSlide && child != mSlideableView) { 574 if (lp.width < 0 && (measuredWidth > fixedPanelWidthLimit || lp.weight > 0)) { 575 // Fixed panels in a sliding configuration should 576 // be clamped to the fixed panel limit. 577 final int childHeightSpec; 578 if (skippedFirstPass) { 579 // Do initial height measurement if we skipped measuring this view 580 // the first time around. 581 if (lp.height == LayoutParams.WRAP_CONTENT) { 582 childHeightSpec = MeasureSpec.makeMeasureSpec(maxLayoutHeight, 583 MeasureSpec.AT_MOST); 584 } else if (lp.height == LayoutParams.FILL_PARENT) { 585 childHeightSpec = MeasureSpec.makeMeasureSpec(maxLayoutHeight, 586 MeasureSpec.EXACTLY); 587 } else { 588 childHeightSpec = MeasureSpec.makeMeasureSpec(lp.height, 589 MeasureSpec.EXACTLY); 590 } 591 } else { 592 childHeightSpec = MeasureSpec.makeMeasureSpec( 593 child.getMeasuredHeight(), MeasureSpec.EXACTLY); 594 } 595 final int childWidthSpec = MeasureSpec.makeMeasureSpec( 596 fixedPanelWidthLimit, MeasureSpec.EXACTLY); 597 child.measure(childWidthSpec, childHeightSpec); 598 } 599 } else if (lp.weight > 0) { 600 int childHeightSpec; 601 if (lp.width == 0) { 602 // This was skipped the first time; figure out a real height spec. 603 if (lp.height == LayoutParams.WRAP_CONTENT) { 604 childHeightSpec = MeasureSpec.makeMeasureSpec(maxLayoutHeight, 605 MeasureSpec.AT_MOST); 606 } else if (lp.height == LayoutParams.FILL_PARENT) { 607 childHeightSpec = MeasureSpec.makeMeasureSpec(maxLayoutHeight, 608 MeasureSpec.EXACTLY); 609 } else { 610 childHeightSpec = MeasureSpec.makeMeasureSpec(lp.height, 611 MeasureSpec.EXACTLY); 612 } 613 } else { 614 childHeightSpec = MeasureSpec.makeMeasureSpec( 615 child.getMeasuredHeight(), MeasureSpec.EXACTLY); 616 } 617 618 if (canSlide) { 619 // Consume available space 620 final int horizontalMargin = lp.leftMargin + lp.rightMargin; 621 final int newWidth = widthSize - horizontalMargin; 622 final int childWidthSpec = MeasureSpec.makeMeasureSpec( 623 newWidth, MeasureSpec.EXACTLY); 624 if (measuredWidth != newWidth) { 625 child.measure(childWidthSpec, childHeightSpec); 626 } 627 } else { 628 // Distribute the extra width proportionally similar to LinearLayout 629 final int widthToDistribute = Math.max(0, widthRemaining); 630 final int addedWidth = (int) (lp.weight * widthToDistribute / weightSum); 631 final int childWidthSpec = MeasureSpec.makeMeasureSpec( 632 measuredWidth + addedWidth, MeasureSpec.EXACTLY); 633 child.measure(childWidthSpec, childHeightSpec); 634 } 635 } 636 } 637 } 638 639 setMeasuredDimension(widthSize, layoutHeight); 640 mCanSlide = canSlide; 641 if (mDragHelper.getViewDragState() != ViewDragHelper.STATE_IDLE && !canSlide) { 642 // Cancel scrolling in progress, it's no longer relevant. 643 mDragHelper.abort(); 644 } 645 } 646 647 @Override 648 protected void onLayout(boolean changed, int l, int t, int r, int b) { 649 final boolean isLayoutRtl = isLayoutRtlSupport(); 650 if (isLayoutRtl) { 651 mDragHelper.setEdgeTrackingEnabled(ViewDragHelper.EDGE_RIGHT); 652 } else { 653 mDragHelper.setEdgeTrackingEnabled(ViewDragHelper.EDGE_LEFT); 654 } 655 final int width = r - l; 656 final int paddingStart = isLayoutRtl ? getPaddingRight() : getPaddingLeft(); 657 final int paddingEnd = isLayoutRtl ? getPaddingLeft() : getPaddingRight(); 658 final int paddingTop = getPaddingTop(); 659 660 final int childCount = getChildCount(); 661 int xStart = paddingStart; 662 int nextXStart = xStart; 663 664 if (mFirstLayout) { 665 mSlideOffset = mCanSlide && mPreservedOpenState ? 1.f : 0.f; 666 } 667 668 for (int i = 0; i < childCount; i++) { 669 final View child = getChildAt(i); 670 671 if (child.getVisibility() == GONE) { 672 continue; 673 } 674 675 final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 676 677 final int childWidth = child.getMeasuredWidth(); 678 int offset = 0; 679 680 if (lp.slideable) { 681 final int margin = lp.leftMargin + lp.rightMargin; 682 final int range = Math.min(nextXStart, 683 width - paddingEnd - mOverhangSize) - xStart - margin; 684 mSlideRange = range; 685 final int lpMargin = isLayoutRtl ? lp.rightMargin : lp.leftMargin; 686 lp.dimWhenOffset = xStart + lpMargin + range + childWidth / 2 > 687 width - paddingEnd; 688 final int pos = (int) (range * mSlideOffset); 689 xStart += pos + lpMargin; 690 mSlideOffset = (float) pos / mSlideRange; 691 } else if (mCanSlide && mParallaxBy != 0) { 692 offset = (int) ((1 - mSlideOffset) * mParallaxBy); 693 xStart = nextXStart; 694 } else { 695 xStart = nextXStart; 696 } 697 698 final int childRight; 699 final int childLeft; 700 if (isLayoutRtl) { 701 childRight = width - xStart + offset; 702 childLeft = childRight - childWidth; 703 } else { 704 childLeft = xStart - offset; 705 childRight = childLeft + childWidth; 706 } 707 708 final int childTop = paddingTop; 709 final int childBottom = childTop + child.getMeasuredHeight(); 710 child.layout(childLeft, paddingTop, childRight, childBottom); 711 712 nextXStart += child.getWidth(); 713 } 714 715 if (mFirstLayout) { 716 if (mCanSlide) { 717 if (mParallaxBy != 0) { 718 parallaxOtherViews(mSlideOffset); 719 } 720 if (((LayoutParams) mSlideableView.getLayoutParams()).dimWhenOffset) { 721 dimChildView(mSlideableView, mSlideOffset, mSliderFadeColor); 722 } 723 } else { 724 // Reset the dim level of all children; it's irrelevant when nothing moves. 725 for (int i = 0; i < childCount; i++) { 726 dimChildView(getChildAt(i), 0, mSliderFadeColor); 727 } 728 } 729 updateObscuredViewsVisibility(mSlideableView); 730 } 731 732 mFirstLayout = false; 733 } 734 735 @Override 736 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 737 super.onSizeChanged(w, h, oldw, oldh); 738 // Recalculate sliding panes and their details 739 if (w != oldw) { 740 mFirstLayout = true; 741 } 742 } 743 744 @Override 745 public void requestChildFocus(View child, View focused) { 746 super.requestChildFocus(child, focused); 747 if (!isInTouchMode() && !mCanSlide) { 748 mPreservedOpenState = child == mSlideableView; 749 } 750 } 751 752 @Override 753 public boolean onInterceptTouchEvent(MotionEvent ev) { 754 final int action = MotionEventCompat.getActionMasked(ev); 755 756 // Preserve the open state based on the last view that was touched. 757 if (!mCanSlide && action == MotionEvent.ACTION_DOWN && getChildCount() > 1) { 758 // After the first things will be slideable. 759 final View secondChild = getChildAt(1); 760 if (secondChild != null) { 761 mPreservedOpenState = !mDragHelper.isViewUnder(secondChild, 762 (int) ev.getX(), (int) ev.getY()); 763 } 764 } 765 766 if (!mCanSlide || (mIsUnableToDrag && action != MotionEvent.ACTION_DOWN)) { 767 mDragHelper.cancel(); 768 return super.onInterceptTouchEvent(ev); 769 } 770 771 if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) { 772 mDragHelper.cancel(); 773 return false; 774 } 775 776 boolean interceptTap = false; 777 778 switch (action) { 779 case MotionEvent.ACTION_DOWN: { 780 mIsUnableToDrag = false; 781 final float x = ev.getX(); 782 final float y = ev.getY(); 783 mInitialMotionX = x; 784 mInitialMotionY = y; 785 786 if (mDragHelper.isViewUnder(mSlideableView, (int) x, (int) y) && 787 isDimmed(mSlideableView)) { 788 interceptTap = true; 789 } 790 break; 791 } 792 793 case MotionEvent.ACTION_MOVE: { 794 final float x = ev.getX(); 795 final float y = ev.getY(); 796 final float adx = Math.abs(x - mInitialMotionX); 797 final float ady = Math.abs(y - mInitialMotionY); 798 final int slop = mDragHelper.getTouchSlop(); 799 if (adx > slop && ady > adx) { 800 mDragHelper.cancel(); 801 mIsUnableToDrag = true; 802 return false; 803 } 804 } 805 } 806 807 final boolean interceptForDrag = mDragHelper.shouldInterceptTouchEvent(ev); 808 809 return interceptForDrag || interceptTap; 810 } 811 812 @Override 813 public boolean onTouchEvent(MotionEvent ev) { 814 if (!mCanSlide) { 815 return super.onTouchEvent(ev); 816 } 817 818 mDragHelper.processTouchEvent(ev); 819 820 final int action = ev.getAction(); 821 boolean wantTouchEvents = true; 822 823 switch (action & MotionEventCompat.ACTION_MASK) { 824 case MotionEvent.ACTION_DOWN: { 825 final float x = ev.getX(); 826 final float y = ev.getY(); 827 mInitialMotionX = x; 828 mInitialMotionY = y; 829 break; 830 } 831 832 case MotionEvent.ACTION_UP: { 833 if (isDimmed(mSlideableView)) { 834 final float x = ev.getX(); 835 final float y = ev.getY(); 836 final float dx = x - mInitialMotionX; 837 final float dy = y - mInitialMotionY; 838 final int slop = mDragHelper.getTouchSlop(); 839 if (dx * dx + dy * dy < slop * slop && 840 mDragHelper.isViewUnder(mSlideableView, (int) x, (int) y)) { 841 // Taps close a dimmed open pane. 842 closePane(mSlideableView, 0); 843 break; 844 } 845 } 846 break; 847 } 848 } 849 850 return wantTouchEvents; 851 } 852 853 private boolean closePane(View pane, int initialVelocity) { 854 if (mFirstLayout || smoothSlideTo(0.f, initialVelocity)) { 855 mPreservedOpenState = false; 856 return true; 857 } 858 return false; 859 } 860 861 private boolean openPane(View pane, int initialVelocity) { 862 if (mFirstLayout || smoothSlideTo(1.f, initialVelocity)) { 863 mPreservedOpenState = true; 864 return true; 865 } 866 return false; 867 } 868 869 /** 870 * @deprecated Renamed to {@link #openPane()} - this method is going away soon! 871 */ 872 @Deprecated 873 public void smoothSlideOpen() { 874 openPane(); 875 } 876 877 /** 878 * Open the sliding pane if it is currently slideable. If first layout 879 * has already completed this will animate. 880 * 881 * @return true if the pane was slideable and is now open/in the process of opening 882 */ 883 public boolean openPane() { 884 return openPane(mSlideableView, 0); 885 } 886 887 /** 888 * @deprecated Renamed to {@link #closePane()} - this method is going away soon! 889 */ 890 @Deprecated 891 public void smoothSlideClosed() { 892 closePane(); 893 } 894 895 /** 896 * Close the sliding pane if it is currently slideable. If first layout 897 * has already completed this will animate. 898 * 899 * @return true if the pane was slideable and is now closed/in the process of closing 900 */ 901 public boolean closePane() { 902 return closePane(mSlideableView, 0); 903 } 904 905 /** 906 * Check if the layout is completely open. It can be open either because the slider 907 * itself is open revealing the left pane, or if all content fits without sliding. 908 * 909 * @return true if sliding panels are completely open 910 */ 911 public boolean isOpen() { 912 return !mCanSlide || mSlideOffset == 1; 913 } 914 915 /** 916 * @return true if content in this layout can be slid open and closed 917 * @deprecated Renamed to {@link #isSlideable()} - this method is going away soon! 918 */ 919 @Deprecated 920 public boolean canSlide() { 921 return mCanSlide; 922 } 923 924 /** 925 * Check if the content in this layout cannot fully fit side by side and therefore 926 * the content pane can be slid back and forth. 927 * 928 * @return true if content in this layout can be slid open and closed 929 */ 930 public boolean isSlideable() { 931 return mCanSlide; 932 } 933 934 private void onPanelDragged(int newLeft) { 935 if (mSlideableView == null) { 936 // This can happen if we're aborting motion during layout because everything now fits. 937 mSlideOffset = 0; 938 return; 939 } 940 final boolean isLayoutRtl = isLayoutRtlSupport(); 941 final LayoutParams lp = (LayoutParams) mSlideableView.getLayoutParams(); 942 943 int childWidth = mSlideableView.getWidth(); 944 final int newStart = isLayoutRtl ? getWidth() - newLeft - childWidth : newLeft; 945 946 final int paddingStart = isLayoutRtl ? getPaddingRight() : getPaddingLeft(); 947 final int lpMargin = isLayoutRtl ? lp.rightMargin : lp.leftMargin; 948 final int startBound = paddingStart + lpMargin; 949 950 mSlideOffset = (float) (newStart - startBound) / mSlideRange; 951 952 if (mParallaxBy != 0) { 953 parallaxOtherViews(mSlideOffset); 954 } 955 956 if (lp.dimWhenOffset) { 957 dimChildView(mSlideableView, mSlideOffset, mSliderFadeColor); 958 } 959 dispatchOnPanelSlide(mSlideableView); 960 } 961 962 private void dimChildView(View v, float mag, int fadeColor) { 963 final LayoutParams lp = (LayoutParams) v.getLayoutParams(); 964 965 if (mag > 0 && fadeColor != 0) { 966 final int baseAlpha = (fadeColor & 0xff000000) >>> 24; 967 int imag = (int) (baseAlpha * mag); 968 int color = imag << 24 | (fadeColor & 0xffffff); 969 if (lp.dimPaint == null) { 970 lp.dimPaint = new Paint(); 971 } 972 lp.dimPaint.setColorFilter(new PorterDuffColorFilter(color, PorterDuff.Mode.SRC_OVER)); 973 if (ViewCompat.getLayerType(v) != ViewCompat.LAYER_TYPE_HARDWARE) { 974 ViewCompat.setLayerType(v, ViewCompat.LAYER_TYPE_HARDWARE, lp.dimPaint); 975 } 976 invalidateChildRegion(v); 977 } else if (ViewCompat.getLayerType(v) != ViewCompat.LAYER_TYPE_NONE) { 978 if (lp.dimPaint != null) { 979 lp.dimPaint.setColorFilter(null); 980 } 981 final DisableLayerRunnable dlr = new DisableLayerRunnable(v); 982 mPostedRunnables.add(dlr); 983 ViewCompat.postOnAnimation(this, dlr); 984 } 985 } 986 987 @Override 988 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 989 final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 990 boolean result; 991 final int save = canvas.save(Canvas.CLIP_SAVE_FLAG); 992 993 if (mCanSlide && !lp.slideable && mSlideableView != null) { 994 // Clip against the slider; no sense drawing what will immediately be covered. 995 canvas.getClipBounds(mTmpRect); 996 if (isLayoutRtlSupport()) { 997 mTmpRect.left = Math.max(mTmpRect.left, mSlideableView.getRight()); 998 } else { 999 mTmpRect.right = Math.min(mTmpRect.right, mSlideableView.getLeft()); 1000 } 1001 canvas.clipRect(mTmpRect); 1002 } 1003 1004 if (Build.VERSION.SDK_INT >= 11) { // HC 1005 result = super.drawChild(canvas, child, drawingTime); 1006 } else { 1007 if (lp.dimWhenOffset && mSlideOffset > 0) { 1008 if (!child.isDrawingCacheEnabled()) { 1009 child.setDrawingCacheEnabled(true); 1010 } 1011 final Bitmap cache = child.getDrawingCache(); 1012 if (cache != null) { 1013 canvas.drawBitmap(cache, child.getLeft(), child.getTop(), lp.dimPaint); 1014 result = false; 1015 } else { 1016 Log.e(TAG, "drawChild: child view " + child + " returned null drawing cache"); 1017 result = super.drawChild(canvas, child, drawingTime); 1018 } 1019 } else { 1020 if (child.isDrawingCacheEnabled()) { 1021 child.setDrawingCacheEnabled(false); 1022 } 1023 result = super.drawChild(canvas, child, drawingTime); 1024 } 1025 } 1026 1027 canvas.restoreToCount(save); 1028 1029 return result; 1030 } 1031 1032 private void invalidateChildRegion(View v) { 1033 IMPL.invalidateChildRegion(this, v); 1034 } 1035 1036 /** 1037 * Smoothly animate mDraggingPane to the target X position within its range. 1038 * 1039 * @param slideOffset position to animate to 1040 * @param velocity initial velocity in case of fling, or 0. 1041 */ 1042 boolean smoothSlideTo(float slideOffset, int velocity) { 1043 if (!mCanSlide) { 1044 // Nothing to do. 1045 return false; 1046 } 1047 1048 final boolean isLayoutRtl = isLayoutRtlSupport(); 1049 final LayoutParams lp = (LayoutParams) mSlideableView.getLayoutParams(); 1050 1051 int x; 1052 if (isLayoutRtl) { 1053 int startBound = getPaddingRight() + lp.rightMargin; 1054 int childWidth = mSlideableView.getWidth(); 1055 x = (int) (getWidth() - (startBound + slideOffset * mSlideRange + childWidth)); 1056 } else { 1057 int startBound = getPaddingLeft() + lp.leftMargin; 1058 x = (int) (startBound + slideOffset * mSlideRange); 1059 } 1060 1061 if (mDragHelper.smoothSlideViewTo(mSlideableView, x, mSlideableView.getTop())) { 1062 setAllChildrenVisible(); 1063 ViewCompat.postInvalidateOnAnimation(this); 1064 return true; 1065 } 1066 return false; 1067 } 1068 1069 @Override 1070 public void computeScroll() { 1071 if (mDragHelper.continueSettling(true)) { 1072 if (!mCanSlide) { 1073 mDragHelper.abort(); 1074 return; 1075 } 1076 1077 ViewCompat.postInvalidateOnAnimation(this); 1078 } 1079 } 1080 1081 /** 1082 * @deprecated Renamed to {@link #setShadowDrawableLeft(Drawable d)} to support LTR (left to 1083 * right language) and {@link #setShadowDrawableRight(Drawable d)} to support RTL (right to left 1084 * language) during opening/closing. 1085 * 1086 * @param d drawable to use as a shadow 1087 */ 1088 @Deprecated 1089 public void setShadowDrawable(Drawable d) { 1090 setShadowDrawableLeft(d); 1091 } 1092 1093 /** 1094 * Set a drawable to use as a shadow cast by the right pane onto the left pane 1095 * during opening/closing. 1096 * 1097 * @param d drawable to use as a shadow 1098 */ 1099 public void setShadowDrawableLeft(Drawable d) { 1100 mShadowDrawableLeft = d; 1101 } 1102 1103 /** 1104 * Set a drawable to use as a shadow cast by the left pane onto the right pane 1105 * during opening/closing to support right to left language. 1106 * 1107 * @param d drawable to use as a shadow 1108 */ 1109 public void setShadowDrawableRight(Drawable d) { 1110 mShadowDrawableRight = d; 1111 } 1112 1113 /** 1114 * Set a drawable to use as a shadow cast by the right pane onto the left pane 1115 * during opening/closing. 1116 * 1117 * @param resId Resource ID of a drawable to use 1118 */ 1119 @Deprecated 1120 public void setShadowResource(@DrawableRes int resId) { 1121 setShadowDrawable(getResources().getDrawable(resId)); 1122 } 1123 1124 /** 1125 * Set a drawable to use as a shadow cast by the right pane onto the left pane 1126 * during opening/closing. 1127 * 1128 * @param resId Resource ID of a drawable to use 1129 */ 1130 public void setShadowResourceLeft(int resId) { 1131 setShadowDrawableLeft(getResources().getDrawable(resId)); 1132 } 1133 1134 /** 1135 * Set a drawable to use as a shadow cast by the left pane onto the right pane 1136 * during opening/closing to support right to left language. 1137 * 1138 * @param resId Resource ID of a drawable to use 1139 */ 1140 public void setShadowResourceRight(int resId) { 1141 setShadowDrawableRight(getResources().getDrawable(resId)); 1142 } 1143 1144 1145 @Override 1146 public void draw(Canvas c) { 1147 super.draw(c); 1148 final boolean isLayoutRtl = isLayoutRtlSupport(); 1149 Drawable shadowDrawable; 1150 if (isLayoutRtl) { 1151 shadowDrawable = mShadowDrawableRight; 1152 } else { 1153 shadowDrawable = mShadowDrawableLeft; 1154 } 1155 1156 final View shadowView = getChildCount() > 1 ? getChildAt(1) : null; 1157 if (shadowView == null || shadowDrawable == null) { 1158 // No need to draw a shadow if we don't have one. 1159 return; 1160 } 1161 1162 final int top = shadowView.getTop(); 1163 final int bottom = shadowView.getBottom(); 1164 1165 final int shadowWidth = shadowDrawable.getIntrinsicWidth(); 1166 final int left; 1167 final int right; 1168 if (isLayoutRtlSupport()) { 1169 left = shadowView.getRight(); 1170 right = left + shadowWidth; 1171 } else { 1172 right = shadowView.getLeft(); 1173 left = right - shadowWidth; 1174 } 1175 1176 shadowDrawable.setBounds(left, top, right, bottom); 1177 shadowDrawable.draw(c); 1178 } 1179 1180 private void parallaxOtherViews(float slideOffset) { 1181 final boolean isLayoutRtl = isLayoutRtlSupport(); 1182 final LayoutParams slideLp = (LayoutParams) mSlideableView.getLayoutParams(); 1183 final boolean dimViews = slideLp.dimWhenOffset && 1184 (isLayoutRtl ? slideLp.rightMargin : slideLp.leftMargin) <= 0; 1185 final int childCount = getChildCount(); 1186 for (int i = 0; i < childCount; i++) { 1187 final View v = getChildAt(i); 1188 if (v == mSlideableView) continue; 1189 1190 final int oldOffset = (int) ((1 - mParallaxOffset) * mParallaxBy); 1191 mParallaxOffset = slideOffset; 1192 final int newOffset = (int) ((1 - slideOffset) * mParallaxBy); 1193 final int dx = oldOffset - newOffset; 1194 1195 v.offsetLeftAndRight(isLayoutRtl ? -dx : dx); 1196 1197 if (dimViews) { 1198 dimChildView(v, isLayoutRtl ? mParallaxOffset - 1 : 1199 1 - mParallaxOffset, mCoveredFadeColor); 1200 } 1201 } 1202 } 1203 1204 /** 1205 * Tests scrollability within child views of v given a delta of dx. 1206 * 1207 * @param v View to test for horizontal scrollability 1208 * @param checkV Whether the view v passed should itself be checked for scrollability (true), 1209 * or just its children (false). 1210 * @param dx Delta scrolled in pixels 1211 * @param x X coordinate of the active touch point 1212 * @param y Y coordinate of the active touch point 1213 * @return true if child views of v can be scrolled by delta of dx. 1214 */ 1215 protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) { 1216 if (v instanceof ViewGroup) { 1217 final ViewGroup group = (ViewGroup) v; 1218 final int scrollX = v.getScrollX(); 1219 final int scrollY = v.getScrollY(); 1220 final int count = group.getChildCount(); 1221 // Count backwards - let topmost views consume scroll distance first. 1222 for (int i = count - 1; i >= 0; i--) { 1223 // TODO: Add versioned support here for transformed views. 1224 // This will not work for transformed views in Honeycomb+ 1225 final View child = group.getChildAt(i); 1226 if (x + scrollX >= child.getLeft() && x + scrollX < child.getRight() && 1227 y + scrollY >= child.getTop() && y + scrollY < child.getBottom() && 1228 canScroll(child, true, dx, x + scrollX - child.getLeft(), 1229 y + scrollY - child.getTop())) { 1230 return true; 1231 } 1232 } 1233 } 1234 1235 return checkV && ViewCompat.canScrollHorizontally(v, (isLayoutRtlSupport() ? dx : -dx)); 1236 } 1237 1238 boolean isDimmed(View child) { 1239 if (child == null) { 1240 return false; 1241 } 1242 final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 1243 return mCanSlide && lp.dimWhenOffset && mSlideOffset > 0; 1244 } 1245 1246 @Override 1247 protected ViewGroup.LayoutParams generateDefaultLayoutParams() { 1248 return new LayoutParams(); 1249 } 1250 1251 @Override 1252 protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 1253 return p instanceof MarginLayoutParams 1254 ? new LayoutParams((MarginLayoutParams) p) 1255 : new LayoutParams(p); 1256 } 1257 1258 @Override 1259 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 1260 return p instanceof LayoutParams && super.checkLayoutParams(p); 1261 } 1262 1263 @Override 1264 public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) { 1265 return new LayoutParams(getContext(), attrs); 1266 } 1267 1268 @Override 1269 protected Parcelable onSaveInstanceState() { 1270 Parcelable superState = super.onSaveInstanceState(); 1271 1272 SavedState ss = new SavedState(superState); 1273 ss.isOpen = isSlideable() ? isOpen() : mPreservedOpenState; 1274 1275 return ss; 1276 } 1277 1278 @Override 1279 protected void onRestoreInstanceState(Parcelable state) { 1280 SavedState ss = (SavedState) state; 1281 super.onRestoreInstanceState(ss.getSuperState()); 1282 1283 if (ss.isOpen) { 1284 openPane(); 1285 } else { 1286 closePane(); 1287 } 1288 mPreservedOpenState = ss.isOpen; 1289 } 1290 1291 private class DragHelperCallback extends ViewDragHelper.Callback { 1292 1293 @Override 1294 public boolean tryCaptureView(View child, int pointerId) { 1295 if (mIsUnableToDrag) { 1296 return false; 1297 } 1298 1299 return ((LayoutParams) child.getLayoutParams()).slideable; 1300 } 1301 1302 @Override 1303 public void onViewDragStateChanged(int state) { 1304 if (mDragHelper.getViewDragState() == ViewDragHelper.STATE_IDLE) { 1305 if (mSlideOffset == 0) { 1306 updateObscuredViewsVisibility(mSlideableView); 1307 dispatchOnPanelClosed(mSlideableView); 1308 mPreservedOpenState = false; 1309 } else { 1310 dispatchOnPanelOpened(mSlideableView); 1311 mPreservedOpenState = true; 1312 } 1313 } 1314 } 1315 1316 @Override 1317 public void onViewCaptured(View capturedChild, int activePointerId) { 1318 // Make all child views visible in preparation for sliding things around 1319 setAllChildrenVisible(); 1320 } 1321 1322 @Override 1323 public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) { 1324 onPanelDragged(left); 1325 invalidate(); 1326 } 1327 1328 @Override 1329 public void onViewReleased(View releasedChild, float xvel, float yvel) { 1330 final LayoutParams lp = (LayoutParams) releasedChild.getLayoutParams(); 1331 1332 int left; 1333 if (isLayoutRtlSupport()) { 1334 int startToRight = getPaddingRight() + lp.rightMargin; 1335 if (xvel < 0 || (xvel == 0 && mSlideOffset > 0.5f)) { 1336 startToRight += mSlideRange; 1337 } 1338 int childWidth = mSlideableView.getWidth(); 1339 left = getWidth() - startToRight - childWidth; 1340 } else { 1341 left = getPaddingLeft() + lp.leftMargin; 1342 if (xvel > 0 || (xvel == 0 && mSlideOffset > 0.5f)) { 1343 left += mSlideRange; 1344 } 1345 } 1346 mDragHelper.settleCapturedViewAt(left, releasedChild.getTop()); 1347 invalidate(); 1348 } 1349 1350 @Override 1351 public int getViewHorizontalDragRange(View child) { 1352 return mSlideRange; 1353 } 1354 1355 @Override 1356 public int clampViewPositionHorizontal(View child, int left, int dx) { 1357 final LayoutParams lp = (LayoutParams) mSlideableView.getLayoutParams(); 1358 1359 final int newLeft; 1360 if (isLayoutRtlSupport()) { 1361 int startBound = getWidth() - 1362 (getPaddingRight() + lp.rightMargin + mSlideableView.getWidth()); 1363 int endBound = startBound - mSlideRange; 1364 newLeft = Math.max(Math.min(left, startBound), endBound); 1365 } else { 1366 int startBound = getPaddingLeft() + lp.leftMargin; 1367 int endBound = startBound + mSlideRange; 1368 newLeft = Math.min(Math.max(left, startBound), endBound); 1369 } 1370 return newLeft; 1371 } 1372 1373 @Override 1374 public void onEdgeDragStarted(int edgeFlags, int pointerId) { 1375 mDragHelper.captureChildView(mSlideableView, pointerId); 1376 } 1377 } 1378 1379 public static class LayoutParams extends ViewGroup.MarginLayoutParams { 1380 private static final int[] ATTRS = new int[] { 1381 android.R.attr.layout_weight 1382 }; 1383 1384 /** 1385 * The weighted proportion of how much of the leftover space 1386 * this child should consume after measurement. 1387 */ 1388 public float weight = 0; 1389 1390 /** 1391 * True if this pane is the slideable pane in the layout. 1392 */ 1393 boolean slideable; 1394 1395 /** 1396 * True if this view should be drawn dimmed 1397 * when it's been offset from its default position. 1398 */ 1399 boolean dimWhenOffset; 1400 1401 Paint dimPaint; 1402 1403 public LayoutParams() { 1404 super(FILL_PARENT, FILL_PARENT); 1405 } 1406 1407 public LayoutParams(int width, int height) { 1408 super(width, height); 1409 } 1410 1411 public LayoutParams(android.view.ViewGroup.LayoutParams source) { 1412 super(source); 1413 } 1414 1415 public LayoutParams(MarginLayoutParams source) { 1416 super(source); 1417 } 1418 1419 public LayoutParams(LayoutParams source) { 1420 super(source); 1421 this.weight = source.weight; 1422 } 1423 1424 public LayoutParams(Context c, AttributeSet attrs) { 1425 super(c, attrs); 1426 1427 final TypedArray a = c.obtainStyledAttributes(attrs, ATTRS); 1428 this.weight = a.getFloat(0, 0); 1429 a.recycle(); 1430 } 1431 1432 } 1433 1434 static class SavedState extends BaseSavedState { 1435 boolean isOpen; 1436 1437 SavedState(Parcelable superState) { 1438 super(superState); 1439 } 1440 1441 private SavedState(Parcel in) { 1442 super(in); 1443 isOpen = in.readInt() != 0; 1444 } 1445 1446 @Override 1447 public void writeToParcel(Parcel out, int flags) { 1448 super.writeToParcel(out, flags); 1449 out.writeInt(isOpen ? 1 : 0); 1450 } 1451 1452 public static final Parcelable.Creator<SavedState> CREATOR = 1453 new Parcelable.Creator<SavedState>() { 1454 public SavedState createFromParcel(Parcel in) { 1455 return new SavedState(in); 1456 } 1457 1458 public SavedState[] newArray(int size) { 1459 return new SavedState[size]; 1460 } 1461 }; 1462 } 1463 1464 interface SlidingPanelLayoutImpl { 1465 void invalidateChildRegion(SlidingPaneLayout parent, View child); 1466 } 1467 1468 static class SlidingPanelLayoutImplBase implements SlidingPanelLayoutImpl { 1469 public void invalidateChildRegion(SlidingPaneLayout parent, View child) { 1470 ViewCompat.postInvalidateOnAnimation(parent, child.getLeft(), child.getTop(), 1471 child.getRight(), child.getBottom()); 1472 } 1473 } 1474 1475 static class SlidingPanelLayoutImplJB extends SlidingPanelLayoutImplBase { 1476 /* 1477 * Private API hacks! Nasty! Bad! 1478 * 1479 * In Jellybean, some optimizations in the hardware UI renderer 1480 * prevent a changed Paint on a View using a hardware layer from having 1481 * the intended effect. This twiddles some internal bits on the view to force 1482 * it to recreate the display list. 1483 */ 1484 private Method mGetDisplayList; 1485 private Field mRecreateDisplayList; 1486 1487 SlidingPanelLayoutImplJB() { 1488 try { 1489 mGetDisplayList = View.class.getDeclaredMethod("getDisplayList", (Class[]) null); 1490 } catch (NoSuchMethodException e) { 1491 Log.e(TAG, "Couldn't fetch getDisplayList method; dimming won't work right.", e); 1492 } 1493 try { 1494 mRecreateDisplayList = View.class.getDeclaredField("mRecreateDisplayList"); 1495 mRecreateDisplayList.setAccessible(true); 1496 } catch (NoSuchFieldException e) { 1497 Log.e(TAG, "Couldn't fetch mRecreateDisplayList field; dimming will be slow.", e); 1498 } 1499 } 1500 1501 @Override 1502 public void invalidateChildRegion(SlidingPaneLayout parent, View child) { 1503 if (mGetDisplayList != null && mRecreateDisplayList != null) { 1504 try { 1505 mRecreateDisplayList.setBoolean(child, true); 1506 mGetDisplayList.invoke(child, (Object[]) null); 1507 } catch (Exception e) { 1508 Log.e(TAG, "Error refreshing display list state", e); 1509 } 1510 } else { 1511 // Slow path. REALLY slow path. Let's hope we don't get here. 1512 child.invalidate(); 1513 return; 1514 } 1515 super.invalidateChildRegion(parent, child); 1516 } 1517 } 1518 1519 static class SlidingPanelLayoutImplJBMR1 extends SlidingPanelLayoutImplBase { 1520 @Override 1521 public void invalidateChildRegion(SlidingPaneLayout parent, View child) { 1522 ViewCompat.setLayerPaint(child, ((LayoutParams) child.getLayoutParams()).dimPaint); 1523 } 1524 } 1525 1526 class AccessibilityDelegate extends AccessibilityDelegateCompat { 1527 private final Rect mTmpRect = new Rect(); 1528 1529 @Override 1530 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) { 1531 final AccessibilityNodeInfoCompat superNode = AccessibilityNodeInfoCompat.obtain(info); 1532 super.onInitializeAccessibilityNodeInfo(host, superNode); 1533 copyNodeInfoNoChildren(info, superNode); 1534 superNode.recycle(); 1535 1536 info.setClassName(SlidingPaneLayout.class.getName()); 1537 info.setSource(host); 1538 1539 final ViewParent parent = ViewCompat.getParentForAccessibility(host); 1540 if (parent instanceof View) { 1541 info.setParent((View) parent); 1542 } 1543 1544 // This is a best-approximation of addChildrenForAccessibility() 1545 // that accounts for filtering. 1546 final int childCount = getChildCount(); 1547 for (int i = 0; i < childCount; i++) { 1548 final View child = getChildAt(i); 1549 if (!filter(child) && (child.getVisibility() == View.VISIBLE)) { 1550 // Force importance to "yes" since we can't read the value. 1551 ViewCompat.setImportantForAccessibility( 1552 child, ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES); 1553 info.addChild(child); 1554 } 1555 } 1556 } 1557 1558 @Override 1559 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 1560 super.onInitializeAccessibilityEvent(host, event); 1561 1562 event.setClassName(SlidingPaneLayout.class.getName()); 1563 } 1564 1565 @Override 1566 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 1567 AccessibilityEvent event) { 1568 if (!filter(child)) { 1569 return super.onRequestSendAccessibilityEvent(host, child, event); 1570 } 1571 return false; 1572 } 1573 1574 public boolean filter(View child) { 1575 return isDimmed(child); 1576 } 1577 1578 /** 1579 * This should really be in AccessibilityNodeInfoCompat, but there unfortunately 1580 * seem to be a few elements that are not easily cloneable using the underlying API. 1581 * Leave it private here as it's not general-purpose useful. 1582 */ 1583 private void copyNodeInfoNoChildren(AccessibilityNodeInfoCompat dest, 1584 AccessibilityNodeInfoCompat src) { 1585 final Rect rect = mTmpRect; 1586 1587 src.getBoundsInParent(rect); 1588 dest.setBoundsInParent(rect); 1589 1590 src.getBoundsInScreen(rect); 1591 dest.setBoundsInScreen(rect); 1592 1593 dest.setVisibleToUser(src.isVisibleToUser()); 1594 dest.setPackageName(src.getPackageName()); 1595 dest.setClassName(src.getClassName()); 1596 dest.setContentDescription(src.getContentDescription()); 1597 1598 dest.setEnabled(src.isEnabled()); 1599 dest.setClickable(src.isClickable()); 1600 dest.setFocusable(src.isFocusable()); 1601 dest.setFocused(src.isFocused()); 1602 dest.setAccessibilityFocused(src.isAccessibilityFocused()); 1603 dest.setSelected(src.isSelected()); 1604 dest.setLongClickable(src.isLongClickable()); 1605 1606 dest.addAction(src.getActions()); 1607 1608 dest.setMovementGranularities(src.getMovementGranularities()); 1609 } 1610 } 1611 1612 private class DisableLayerRunnable implements Runnable { 1613 final View mChildView; 1614 1615 DisableLayerRunnable(View childView) { 1616 mChildView = childView; 1617 } 1618 1619 @Override 1620 public void run() { 1621 if (mChildView.getParent() == SlidingPaneLayout.this) { 1622 ViewCompat.setLayerType(mChildView, ViewCompat.LAYER_TYPE_NONE, null); 1623 invalidateChildRegion(mChildView); 1624 } 1625 mPostedRunnables.remove(this); 1626 } 1627 } 1628 1629 private boolean isLayoutRtlSupport() { 1630 return ViewCompat.getLayoutDirection(this) == ViewCompat.LAYOUT_DIRECTION_RTL; 1631 } 1632} 1633