PanelView.java revision 507288322b11ae27ab8f47438d3ef4203dad0192
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 com.android.systemui.statusbar.phone; 18 19import android.animation.ObjectAnimator; 20import android.animation.TimeAnimator; 21import android.animation.TimeAnimator.TimeListener; 22import android.content.Context; 23import android.content.res.Resources; 24import android.util.AttributeSet; 25import android.util.Log; 26import android.view.MotionEvent; 27import android.view.View; 28import android.view.ViewConfiguration; 29import android.widget.FrameLayout; 30 31import com.android.systemui.R; 32 33import java.io.FileDescriptor; 34import java.io.PrintWriter; 35import java.util.ArrayDeque; 36import java.util.Iterator; 37 38public class PanelView extends FrameLayout { 39 public static final boolean DEBUG = PanelBar.DEBUG; 40 public static final String TAG = PanelView.class.getSimpleName(); 41 42 public static final boolean DEBUG_NAN = true; // http://b/7686690 43 44 private final void logf(String fmt, Object... args) { 45 Log.v(TAG, (mViewName != null ? (mViewName + ": ") : "") + String.format(fmt, args)); 46 } 47 48 public static final boolean BRAKES = false; 49 50 private float mSelfExpandVelocityPx; // classic value: 2000px/s 51 private float mSelfCollapseVelocityPx; // classic value: 2000px/s (will be negated to collapse "up") 52 private float mFlingExpandMinVelocityPx; // classic value: 200px/s 53 private float mFlingCollapseMinVelocityPx; // classic value: 200px/s 54 private float mCollapseMinDisplayFraction; // classic value: 0.08 (25px/min(320px,480px) on G1) 55 private float mExpandMinDisplayFraction; // classic value: 0.5 (drag open halfway to expand) 56 private float mFlingGestureMaxXVelocityPx; // classic value: 150px/s 57 58 private float mFlingGestureMinDistPx; 59 60 private float mExpandAccelPx; // classic value: 2000px/s/s 61 private float mCollapseAccelPx; // classic value: 2000px/s/s (will be negated to collapse "up") 62 63 private float mFlingGestureMaxOutputVelocityPx; // how fast can it really go? (should be a little 64 // faster than mSelfCollapseVelocityPx) 65 66 private float mCollapseBrakingDistancePx = 200; // XXX Resource 67 private float mExpandBrakingDistancePx = 150; // XXX Resource 68 private float mBrakingSpeedPx = 150; // XXX Resource 69 70 private float mPeekHeight; 71 private float mInitialOffsetOnTouch; 72 private float mExpandedFraction = 0; 73 private float mExpandedHeight = 0; 74 private boolean mJustPeeked; 75 private boolean mClosing; 76 private boolean mTracking; 77 private int mTrackingPointer; 78 private int mTouchSlop; 79 80 private TimeAnimator mTimeAnimator; 81 private ObjectAnimator mPeekAnimator; 82 private FlingTracker mVelocityTracker; 83 84 /** 85 * A very simple low-pass velocity filter for motion events; not nearly as sophisticated as 86 * VelocityTracker but optimized for the kinds of gestures we expect to see in status bar 87 * panels. 88 */ 89 private static class FlingTracker { 90 static final boolean DEBUG = false; 91 final int MAX_EVENTS = 8; 92 final float DECAY = 0.75f; 93 ArrayDeque<MotionEventCopy> mEventBuf = new ArrayDeque<MotionEventCopy>(MAX_EVENTS); 94 float mVX, mVY = 0; 95 private static class MotionEventCopy { 96 public MotionEventCopy(float x2, float y2, long eventTime) { 97 this.x = x2; 98 this.y = y2; 99 this.t = eventTime; 100 } 101 public float x, y; 102 public long t; 103 } 104 public FlingTracker() { 105 } 106 public void addMovement(MotionEvent event) { 107 if (mEventBuf.size() == MAX_EVENTS) { 108 mEventBuf.remove(); 109 } 110 mEventBuf.add(new MotionEventCopy(event.getX(), event.getY(), event.getEventTime())); 111 } 112 public void computeCurrentVelocity(long timebase) { 113 if (FlingTracker.DEBUG) { 114 Log.v("FlingTracker", "computing velocities for " + mEventBuf.size() + " events"); 115 } 116 mVX = mVY = 0; 117 MotionEventCopy last = null; 118 int i = 0; 119 float totalweight = 0f; 120 float weight = 10f; 121 for (final Iterator<MotionEventCopy> iter = mEventBuf.iterator(); 122 iter.hasNext();) { 123 final MotionEventCopy event = iter.next(); 124 if (last != null) { 125 final float dt = (float) (event.t - last.t) / timebase; 126 final float dx = (event.x - last.x); 127 final float dy = (event.y - last.y); 128 if (FlingTracker.DEBUG) { 129 Log.v("FlingTracker", String.format( 130 " [%d] (t=%d %.1f,%.1f) dx=%.1f dy=%.1f dt=%f vx=%.1f vy=%.1f", 131 i, event.t, event.x, event.y, 132 dx, dy, dt, 133 (dx/dt), 134 (dy/dt) 135 )); 136 } 137 if (event.t == last.t) { 138 // Really not sure what to do with events that happened at the same time, 139 // so we'll skip subsequent events. 140 if (DEBUG_NAN) { 141 Log.v("FlingTracker", "skipping simultaneous event at t=" + event.t); 142 } 143 continue; 144 } 145 mVX += weight * dx / dt; 146 mVY += weight * dy / dt; 147 totalweight += weight; 148 weight *= DECAY; 149 } 150 last = event; 151 i++; 152 } 153 if (totalweight > 0) { 154 mVX /= totalweight; 155 mVY /= totalweight; 156 } else { 157 if (DEBUG_NAN) { 158 Log.v("FlingTracker", "computeCurrentVelocity warning: totalweight=0", 159 new Throwable()); 160 } 161 // so as not to contaminate the velocities with NaN 162 mVX = mVY = 0; 163 } 164 165 if (FlingTracker.DEBUG) { 166 Log.v("FlingTracker", "computed: vx=" + mVX + " vy=" + mVY); 167 } 168 } 169 public float getXVelocity() { 170 if (Float.isNaN(mVX) || Float.isInfinite(mVX)) { 171 if (DEBUG_NAN) { 172 Log.v("FlingTracker", "warning: vx=" + mVX); 173 } 174 mVX = 0; 175 } 176 return mVX; 177 } 178 public float getYVelocity() { 179 if (Float.isNaN(mVY) || Float.isInfinite(mVX)) { 180 if (DEBUG_NAN) { 181 Log.v("FlingTracker", "warning: vx=" + mVY); 182 } 183 mVY = 0; 184 } 185 return mVY; 186 } 187 public void recycle() { 188 mEventBuf.clear(); 189 } 190 191 static FlingTracker sTracker; 192 static FlingTracker obtain() { 193 if (sTracker == null) { 194 sTracker = new FlingTracker(); 195 } 196 return sTracker; 197 } 198 } 199 200 PanelBar mBar; 201 202 private final TimeListener mAnimationCallback = new TimeListener() { 203 @Override 204 public void onTimeUpdate(TimeAnimator animation, long totalTime, long deltaTime) { 205 animationTick(deltaTime); 206 } 207 }; 208 209 private final Runnable mStopAnimator = new Runnable() { 210 @Override 211 public void run() { 212 if (mTimeAnimator != null && mTimeAnimator.isStarted()) { 213 mTimeAnimator.end(); 214 mClosing = false; 215 onExpandingFinished(); 216 } 217 } 218 }; 219 220 private float mVel, mAccel; 221 protected int mMaxPanelHeight = 0; 222 private String mViewName; 223 protected float mInitialTouchY; 224 protected float mFinalTouchY; 225 226 protected void onExpandingFinished() { 227 } 228 229 protected void onExpandingStarted() { 230 } 231 232 private void runPeekAnimation() { 233 if (DEBUG) logf("peek to height=%.1f", mPeekHeight); 234 if (mTimeAnimator.isStarted()) { 235 return; 236 } 237 if (mPeekAnimator == null) { 238 mPeekAnimator = ObjectAnimator.ofFloat(this, 239 "expandedHeight", mPeekHeight) 240 .setDuration(250); 241 } 242 mPeekAnimator.start(); 243 } 244 245 private void animationTick(long dtms) { 246 if (!mTimeAnimator.isStarted()) { 247 // XXX HAX to work around bug in TimeAnimator.end() not resetting its last time 248 mTimeAnimator = new TimeAnimator(); 249 mTimeAnimator.setTimeListener(mAnimationCallback); 250 251 if (mPeekAnimator != null) mPeekAnimator.cancel(); 252 253 mTimeAnimator.start(); 254 255 if (mVel == 0) { 256 // if the panel is less than halfway open, close it 257 mClosing = (mFinalTouchY / getMaxPanelHeight()) < 0.5f; 258 } else { 259 mClosing = mExpandedHeight > 0 && mVel < 0; 260 } 261 } else if (dtms > 0) { 262 final float dt = dtms * 0.001f; // ms -> s 263 if (DEBUG) logf("tick: v=%.2fpx/s dt=%.4fs", mVel, dt); 264 if (DEBUG) logf("tick: before: h=%d", (int) mExpandedHeight); 265 266 final float fh = getMaxPanelHeight(); 267 boolean braking = false; 268 if (BRAKES) { 269 if (mClosing) { 270 braking = mExpandedHeight <= mCollapseBrakingDistancePx; 271 mAccel = braking ? 10*mCollapseAccelPx : -mCollapseAccelPx; 272 } else { 273 braking = mExpandedHeight >= (fh-mExpandBrakingDistancePx); 274 mAccel = braking ? 10*-mExpandAccelPx : mExpandAccelPx; 275 } 276 } else { 277 mAccel = mClosing ? -mCollapseAccelPx : mExpandAccelPx; 278 } 279 280 mVel += mAccel * dt; 281 282 if (braking) { 283 if (mClosing && mVel > -mBrakingSpeedPx) { 284 mVel = -mBrakingSpeedPx; 285 } else if (!mClosing && mVel < mBrakingSpeedPx) { 286 mVel = mBrakingSpeedPx; 287 } 288 } else { 289 if (mClosing && mVel > -mFlingCollapseMinVelocityPx) { 290 mVel = -mFlingCollapseMinVelocityPx; 291 } else if (!mClosing && mVel > mFlingGestureMaxOutputVelocityPx) { 292 mVel = mFlingGestureMaxOutputVelocityPx; 293 } 294 } 295 296 float h = mExpandedHeight + mVel * dt; 297 298 if (DEBUG) logf("tick: new h=%d closing=%s", (int) h, mClosing?"true":"false"); 299 300 setExpandedHeightInternal(h); 301 302 mBar.panelExpansionChanged(PanelView.this, mExpandedFraction); 303 304 if (mVel == 0 305 || (mClosing && mExpandedHeight == 0) 306 || (!mClosing && mExpandedHeight == fh)) { 307 post(mStopAnimator); 308 } 309 } else { 310 Log.v(TAG, "animationTick called with dtms=" + dtms + "; nothing to do (h=" 311 + mExpandedHeight + " v=" + mVel + ")"); 312 } 313 } 314 315 public PanelView(Context context, AttributeSet attrs) { 316 super(context, attrs); 317 318 mTimeAnimator = new TimeAnimator(); 319 mTimeAnimator.setTimeListener(mAnimationCallback); 320 setOnHierarchyChangeListener(mHierarchyListener); 321 } 322 323 private void loadDimens() { 324 final Resources res = getContext().getResources(); 325 326 mSelfExpandVelocityPx = res.getDimension(R.dimen.self_expand_velocity); 327 mSelfCollapseVelocityPx = res.getDimension(R.dimen.self_collapse_velocity); 328 mFlingExpandMinVelocityPx = res.getDimension(R.dimen.fling_expand_min_velocity); 329 mFlingCollapseMinVelocityPx = res.getDimension(R.dimen.fling_collapse_min_velocity); 330 331 mFlingGestureMinDistPx = res.getDimension(R.dimen.fling_gesture_min_dist); 332 333 mCollapseMinDisplayFraction = res.getFraction(R.dimen.collapse_min_display_fraction, 1, 1); 334 mExpandMinDisplayFraction = res.getFraction(R.dimen.expand_min_display_fraction, 1, 1); 335 336 mExpandAccelPx = res.getDimension(R.dimen.expand_accel); 337 mCollapseAccelPx = res.getDimension(R.dimen.collapse_accel); 338 339 mFlingGestureMaxXVelocityPx = res.getDimension(R.dimen.fling_gesture_max_x_velocity); 340 341 mFlingGestureMaxOutputVelocityPx = res.getDimension(R.dimen.fling_gesture_max_output_velocity); 342 343 mPeekHeight = res.getDimension(R.dimen.peek_height) 344 + getPaddingBottom(); // our window might have a dropshadow 345 346 final ViewConfiguration configuration = ViewConfiguration.get(getContext()); 347 mTouchSlop = configuration.getScaledTouchSlop(); 348 } 349 350 private void trackMovement(MotionEvent event) { 351 // Add movement to velocity tracker using raw screen X and Y coordinates instead 352 // of window coordinates because the window frame may be moving at the same time. 353 float deltaX = event.getRawX() - event.getX(); 354 float deltaY = event.getRawY() - event.getY(); 355 event.offsetLocation(deltaX, deltaY); 356 if (mVelocityTracker != null) mVelocityTracker.addMovement(event); 357 event.offsetLocation(-deltaX, -deltaY); 358 } 359 360 @Override 361 public boolean onTouchEvent(MotionEvent event) { 362 363 /* 364 * We capture touch events here and update the expand height here in case according to 365 * the users fingers. This also handles multi-touch. 366 * 367 * If the user just clicks shortly, we give him a quick peek of the shade. 368 * 369 * Flinging is also enabled in order to open or close the shade. 370 */ 371 372 int pointerIndex = event.findPointerIndex(mTrackingPointer); 373 if (pointerIndex < 0) { 374 pointerIndex = 0; 375 mTrackingPointer = event.getPointerId(pointerIndex); 376 } 377 final float y = event.getY(pointerIndex); 378 379 switch (event.getActionMasked()) { 380 case MotionEvent.ACTION_DOWN: 381 mTracking = true; 382 383 mInitialTouchY = y; 384 initVelocityTracker(); 385 trackMovement(event); 386 mTimeAnimator.cancel(); // end any outstanding animations 387 onTrackingStarted(); 388 mInitialOffsetOnTouch = mExpandedHeight; 389 if (mExpandedHeight == 0) { 390 mJustPeeked = true; 391 runPeekAnimation(); 392 } 393 break; 394 395 case MotionEvent.ACTION_POINTER_UP: 396 final int upPointer = event.getPointerId(event.getActionIndex()); 397 if (mTrackingPointer == upPointer) { 398 // gesture is ongoing, find a new pointer to track 399 final int newIndex = event.getPointerId(0) != upPointer ? 0 : 1; 400 final float newY = event.getY(newIndex); 401 mTrackingPointer = event.getPointerId(newIndex); 402 mInitialOffsetOnTouch = mExpandedHeight; 403 mInitialTouchY = newY; 404 } 405 break; 406 407 case MotionEvent.ACTION_MOVE: 408 final float h = y - mInitialTouchY + mInitialOffsetOnTouch; 409 if (h > mPeekHeight) { 410 if (mPeekAnimator != null && mPeekAnimator.isStarted()) { 411 mPeekAnimator.cancel(); 412 } 413 mJustPeeked = false; 414 } 415 if (!mJustPeeked) { 416 setExpandedHeightInternal(h); 417 mBar.panelExpansionChanged(PanelView.this, mExpandedFraction); 418 } 419 420 trackMovement(event); 421 break; 422 423 case MotionEvent.ACTION_UP: 424 case MotionEvent.ACTION_CANCEL: 425 mFinalTouchY = y; 426 mTracking = false; 427 mTrackingPointer = -1; 428 onTrackingStopped(); 429 trackMovement(event); 430 431 float vel = getCurrentVelocity(); 432 fling(vel, true); 433 434 if (mVelocityTracker != null) { 435 mVelocityTracker.recycle(); 436 mVelocityTracker = null; 437 } 438 break; 439 } 440 return true; 441 } 442 443 protected void onTrackingStopped() { 444 mBar.onTrackingStopped(PanelView.this); 445 } 446 447 protected void onTrackingStarted() { 448 mBar.onTrackingStarted(PanelView.this); 449 onExpandingStarted(); 450 } 451 452 private float getCurrentVelocity() { 453 float vel = 0; 454 float yVel = 0, xVel = 0; 455 boolean negative = false; 456 457 // the velocitytracker might be null if we got a bad input stream 458 if (mVelocityTracker == null) { 459 return 0; 460 } 461 462 mVelocityTracker.computeCurrentVelocity(1000); 463 464 yVel = mVelocityTracker.getYVelocity(); 465 negative = yVel < 0; 466 467 xVel = mVelocityTracker.getXVelocity(); 468 if (xVel < 0) { 469 xVel = -xVel; 470 } 471 if (xVel > mFlingGestureMaxXVelocityPx) { 472 xVel = mFlingGestureMaxXVelocityPx; // limit how much we care about the x axis 473 } 474 475 vel = (float) Math.hypot(yVel, xVel); 476 if (vel > mFlingGestureMaxOutputVelocityPx) { 477 vel = mFlingGestureMaxOutputVelocityPx; 478 } 479 480 // if you've barely moved your finger, we treat the velocity as 0 481 // preventing spurious flings due to touch screen jitter 482 final float deltaY = Math.abs(mFinalTouchY - mInitialTouchY); 483 if (deltaY < mFlingGestureMinDistPx 484 || vel < mFlingExpandMinVelocityPx 485 ) { 486 vel = 0; 487 } 488 489 if (negative) { 490 vel = -vel; 491 } 492 493 if (DEBUG) { 494 logf("gesture: dy=%f vel=(%f,%f) vlinear=%f", 495 deltaY, 496 xVel, yVel, 497 vel); 498 } 499 return vel; 500 } 501 502 @Override 503 public boolean onInterceptTouchEvent(MotionEvent event) { 504 505 /* 506 * If the user drags anywhere inside the panel we intercept it if he moves his finger 507 * upwards. This allows closing the shade from anywhere inside the panel. 508 * 509 * We only do this if the current content is scrolled to the bottom, 510 * i.e isScrolledToBottom() is true and therefore there is no conflicting scrolling gesture 511 * possible. 512 */ 513 int pointerIndex = event.findPointerIndex(mTrackingPointer); 514 if (pointerIndex < 0) { 515 pointerIndex = 0; 516 mTrackingPointer = event.getPointerId(pointerIndex); 517 } 518 final float y = event.getY(pointerIndex); 519 boolean scrolledToBottom = isScrolledToBottom(); 520 521 switch (event.getActionMasked()) { 522 case MotionEvent.ACTION_DOWN: 523 mInitialTouchY = y; 524 initVelocityTracker(); 525 trackMovement(event); 526 mTimeAnimator.cancel(); // end any outstanding animations 527 if (mExpandedHeight == 0 || y > getContentHeight()) { 528 return true; 529 } 530 break; 531 case MotionEvent.ACTION_POINTER_UP: 532 final int upPointer = event.getPointerId(event.getActionIndex()); 533 if (mTrackingPointer == upPointer) { 534 // gesture is ongoing, find a new pointer to track 535 final int newIndex = event.getPointerId(0) != upPointer ? 0 : 1; 536 mTrackingPointer = event.getPointerId(newIndex); 537 final float newY = event.getY(newIndex); 538 mInitialTouchY = newY; 539 } 540 break; 541 542 case MotionEvent.ACTION_MOVE: 543 final float h = y - mInitialTouchY; 544 trackMovement(event); 545 if (scrolledToBottom) { 546 if (h < -mTouchSlop) { 547 mInitialOffsetOnTouch = mExpandedHeight; 548 mInitialTouchY = y; 549 mTracking = true; 550 onTrackingStarted(); 551 return true; 552 } 553 } 554 break; 555 } 556 return false; 557 } 558 559 private void initVelocityTracker() { 560 if (mVelocityTracker != null) { 561 mVelocityTracker.recycle(); 562 } 563 mVelocityTracker = FlingTracker.obtain(); 564 } 565 566 protected boolean isScrolledToBottom() { 567 return false; 568 } 569 570 protected float getContentHeight() { 571 return mExpandedHeight; 572 } 573 574 @Override 575 protected void onFinishInflate() { 576 super.onFinishInflate(); 577 578 loadDimens(); 579 } 580 581 public void fling(float vel, boolean always) { 582 if (DEBUG) logf("fling: vel=%.3f, this=%s", vel, this); 583 mVel = vel; 584 585 if (always||mVel != 0) { 586 animationTick(0); // begin the animation 587 } else { 588 onExpandingFinished(); 589 } 590 } 591 592 @Override 593 protected void onAttachedToWindow() { 594 super.onAttachedToWindow(); 595 mViewName = getResources().getResourceName(getId()); 596 } 597 598 public String getName() { 599 return mViewName; 600 } 601 602 // Rubberbands the panel to hold its contents. 603 @Override 604 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 605 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 606 607 if (DEBUG) logf("onMeasure(%d, %d) -> (%d, %d)", 608 widthMeasureSpec, heightMeasureSpec, getMeasuredWidth(), getMeasuredHeight()); 609 610 // Did one of our children change size? 611 int newHeight = getMeasuredHeight(); 612 if (newHeight != mMaxPanelHeight) { 613 mMaxPanelHeight = newHeight; 614 // If the user isn't actively poking us, let's rubberband to the content 615 if (!mTracking && !mTimeAnimator.isStarted() 616 && mExpandedHeight > 0 && mExpandedHeight != mMaxPanelHeight 617 && mMaxPanelHeight > 0) { 618 mExpandedHeight = mMaxPanelHeight; 619 } 620 } 621 heightMeasureSpec = MeasureSpec.makeMeasureSpec( 622 getDesiredMeasureHeight(), MeasureSpec.AT_MOST); 623 setMeasuredDimension(widthMeasureSpec, heightMeasureSpec); 624 } 625 626 protected int getDesiredMeasureHeight() { 627 return (int) mExpandedHeight; 628 } 629 630 631 public void setExpandedHeight(float height) { 632 if (DEBUG) logf("setExpandedHeight(%.1f)", height); 633 if (mTimeAnimator.isStarted()) { 634 post(mStopAnimator); 635 } 636 setExpandedHeightInternal(height); 637 mBar.panelExpansionChanged(PanelView.this, mExpandedFraction); 638 } 639 640 @Override 641 protected void onLayout (boolean changed, int left, int top, int right, int bottom) { 642 if (DEBUG) logf("onLayout: changed=%s, bottom=%d eh=%d fh=%d", changed?"T":"f", bottom, 643 (int)mExpandedHeight, mMaxPanelHeight); 644 super.onLayout(changed, left, top, right, bottom); 645 requestPanelHeightUpdate(); 646 } 647 648 protected void requestPanelHeightUpdate() { 649 float currentMaxPanelHeight = getMaxPanelHeight(); 650 651 // If the user isn't actively poking us, let's update the height 652 if (!mTracking && !mTimeAnimator.isStarted() 653 && mExpandedHeight > 0 && currentMaxPanelHeight != mExpandedHeight) { 654 setExpandedHeightInternal(currentMaxPanelHeight); 655 } 656 } 657 658 public void setExpandedHeightInternal(float h) { 659 if (Float.isNaN(h)) { 660 // If a NaN gets in here, it will freeze the Animators. 661 if (DEBUG_NAN) { 662 Log.v(TAG, "setExpandedHeightInternal: warning: h=NaN, using 0 instead", 663 new Throwable()); 664 } 665 h = 0; 666 } 667 668 float fh = getMaxPanelHeight(); 669 if (fh == 0) { 670 // Hmm, full height hasn't been computed yet 671 } 672 673 if (h < 0) h = 0; 674 if (h > fh) h = fh; 675 676 mExpandedHeight = h; 677 678 if (DEBUG) { 679 logf("setExpansion: height=%.1f fh=%.1f tracking=%s", h, fh, 680 mTracking ? "T" : "f"); 681 } 682 683 onHeightUpdated(mExpandedHeight); 684 685// FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) getLayoutParams(); 686// lp.height = (int) mExpandedHeight; 687// setLayoutParams(lp); 688 689 mExpandedFraction = Math.min(1f, (fh == 0) ? 0 : h / fh); 690 } 691 692 protected void onHeightUpdated(float expandedHeight) { 693 requestLayout(); 694 } 695 696 /** 697 * This returns the maximum height of the panel. Children should override this if their 698 * desired height is not the full height. 699 * 700 * @return the default implementation simply returns the maximum height. 701 */ 702 protected int getMaxPanelHeight() { 703 if (mMaxPanelHeight <= 0) { 704 if (DEBUG) logf("Forcing measure() since mMaxPanelHeight=" + mMaxPanelHeight); 705 measure(MeasureSpec.makeMeasureSpec(android.view.ViewGroup.LayoutParams.WRAP_CONTENT, MeasureSpec.EXACTLY), 706 MeasureSpec.makeMeasureSpec(android.view.ViewGroup.LayoutParams.WRAP_CONTENT, MeasureSpec.EXACTLY)); 707 } 708 return mMaxPanelHeight; 709 } 710 711 public void setExpandedFraction(float frac) { 712 if (Float.isNaN(frac)) { 713 // If a NaN gets in here, it will freeze the Animators. 714 if (DEBUG_NAN) { 715 Log.v(TAG, "setExpandedFraction: frac=NaN, using 0 instead", 716 new Throwable()); 717 } 718 frac = 0; 719 } 720 setExpandedHeight(getMaxPanelHeight() * frac); 721 } 722 723 public float getExpandedHeight() { 724 return mExpandedHeight; 725 } 726 727 public float getExpandedFraction() { 728 return mExpandedFraction; 729 } 730 731 public boolean isFullyExpanded() { 732 return mExpandedHeight >= getMaxPanelHeight(); 733 } 734 735 public boolean isFullyCollapsed() { 736 return mExpandedHeight <= 0; 737 } 738 739 public boolean isCollapsing() { 740 return mClosing; 741 } 742 743 public boolean isTracking() { 744 return mTracking; 745 } 746 747 public void setBar(PanelBar panelBar) { 748 mBar = panelBar; 749 } 750 751 public void collapse() { 752 // TODO: abort animation or ongoing touch 753 if (DEBUG) logf("collapse: " + this); 754 if (!isFullyCollapsed()) { 755 mTimeAnimator.cancel(); 756 mClosing = true; 757 onExpandingStarted(); 758 // collapse() should never be a rubberband, even if an animation is already running 759 fling(-mSelfCollapseVelocityPx, /*always=*/ true); 760 } 761 } 762 763 public void expand() { 764 if (DEBUG) logf("expand: " + this); 765 if (isFullyCollapsed()) { 766 mBar.startOpeningPanel(this); 767 onExpandingStarted(); 768 fling(mSelfExpandVelocityPx, /*always=*/ true); 769 } else if (DEBUG) { 770 if (DEBUG) logf("skipping expansion: is expanded"); 771 } 772 } 773 774 public void cancelPeek() { 775 if (mPeekAnimator != null && mPeekAnimator.isStarted()) { 776 mPeekAnimator.cancel(); 777 } 778 } 779 780 public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 781 pw.println(String.format("[PanelView(%s): expandedHeight=%f maxPanelHeight=%d closing=%s" 782 + " tracking=%s justPeeked=%s peekAnim=%s%s timeAnim=%s%s" 783 + "]", 784 this.getClass().getSimpleName(), 785 getExpandedHeight(), 786 getMaxPanelHeight(), 787 mClosing?"T":"f", 788 mTracking?"T":"f", 789 mJustPeeked?"T":"f", 790 mPeekAnimator, ((mPeekAnimator!=null && mPeekAnimator.isStarted())?" (started)":""), 791 mTimeAnimator, ((mTimeAnimator!=null && mTimeAnimator.isStarted())?" (started)":"") 792 )); 793 } 794 795 private final OnHierarchyChangeListener mHierarchyListener = new OnHierarchyChangeListener() { 796 @Override 797 public void onChildViewAdded(View parent, View child) { 798 if (DEBUG) logf("onViewAdded: " + child); 799 } 800 801 @Override 802 public void onChildViewRemoved(View parent, View child) { 803 } 804 }; 805} 806