NumberPicker.java revision 47730f1582dfa67909293d6d5b88ff89c5ad6ed5
1/* 2 * Copyright (C) 2008 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.widget; 18 19import android.animation.Animator; 20import android.animation.AnimatorListenerAdapter; 21import android.animation.AnimatorSet; 22import android.animation.ObjectAnimator; 23import android.annotation.Widget; 24import android.content.Context; 25import android.content.res.ColorStateList; 26import android.content.res.TypedArray; 27import android.graphics.Canvas; 28import android.graphics.Color; 29import android.graphics.Paint; 30import android.graphics.Paint.Align; 31import android.graphics.Rect; 32import android.graphics.drawable.Drawable; 33import android.text.InputFilter; 34import android.text.InputType; 35import android.text.Spanned; 36import android.text.TextUtils; 37import android.text.method.NumberKeyListener; 38import android.util.AttributeSet; 39import android.util.SparseArray; 40import android.util.TypedValue; 41import android.view.KeyEvent; 42import android.view.LayoutInflater; 43import android.view.LayoutInflater.Filter; 44import android.view.MotionEvent; 45import android.view.VelocityTracker; 46import android.view.View; 47import android.view.ViewConfiguration; 48import android.view.accessibility.AccessibilityEvent; 49import android.view.accessibility.AccessibilityManager; 50import android.view.animation.DecelerateInterpolator; 51import android.view.inputmethod.InputMethodManager; 52 53import com.android.internal.R; 54 55/** 56 * A widget that enables the user to select a number form a predefined range. 57 * The widget presents an input filed and up and down buttons for selecting the 58 * current value. Pressing/long pressing the up and down buttons increments and 59 * decrements the current value respectively. Touching the input filed shows a 60 * scroll wheel, tapping on which while shown and not moving allows direct edit 61 * of the current value. Sliding motions up or down hide the buttons and the 62 * input filed, show the scroll wheel, and rotate the latter. Flinging is 63 * also supported. The widget enables mapping from positions to strings such 64 * that instead the position index the corresponding string is displayed. 65 * <p> 66 * For an example of using this widget, see {@link android.widget.TimePicker}. 67 * </p> 68 */ 69@Widget 70public class NumberPicker extends LinearLayout { 71 72 /** 73 * The default update interval during long press. 74 */ 75 private static final long DEFAULT_LONG_PRESS_UPDATE_INTERVAL = 300; 76 77 /** 78 * The index of the middle selector item. 79 */ 80 private static final int SELECTOR_MIDDLE_ITEM_INDEX = 2; 81 82 /** 83 * The coefficient by which to adjust (divide) the max fling velocity. 84 */ 85 private static final int SELECTOR_MAX_FLING_VELOCITY_ADJUSTMENT = 8; 86 87 /** 88 * The the duration for adjusting the selector wheel. 89 */ 90 private static final int SELECTOR_ADJUSTMENT_DURATION_MILLIS = 800; 91 92 /** 93 * The duration of scrolling to the next/previous value while changing 94 * the current value by one, i.e. increment or decrement. 95 */ 96 private static final int CHANGE_CURRENT_BY_ONE_SCROLL_DURATION = 300; 97 98 /** 99 * The the delay for showing the input controls after a single tap on the 100 * input text. 101 */ 102 private static final int SHOW_INPUT_CONTROLS_DELAY_MILLIS = ViewConfiguration 103 .getDoubleTapTimeout(); 104 105 /** 106 * The strength of fading in the top and bottom while drawing the selector. 107 */ 108 private static final float TOP_AND_BOTTOM_FADING_EDGE_STRENGTH = 0.9f; 109 110 /** 111 * The default unscaled height of the selection divider. 112 */ 113 private static final int UNSCALED_DEFAULT_SELECTION_DIVIDER_HEIGHT = 2; 114 115 /** 116 * In this state the selector wheel is not shown. 117 */ 118 private static final int SELECTOR_WHEEL_STATE_NONE = 0; 119 120 /** 121 * In this state the selector wheel is small. 122 */ 123 private static final int SELECTOR_WHEEL_STATE_SMALL = 1; 124 125 /** 126 * In this state the selector wheel is large. 127 */ 128 private static final int SELECTOR_WHEEL_STATE_LARGE = 2; 129 130 /** 131 * The alpha of the selector wheel when it is bright. 132 */ 133 private static final int SELECTOR_WHEEL_BRIGHT_ALPHA = 255; 134 135 /** 136 * The alpha of the selector wheel when it is dimmed. 137 */ 138 private static final int SELECTOR_WHEEL_DIM_ALPHA = 60; 139 140 /** 141 * The alpha for the increment/decrement button when it is transparent. 142 */ 143 private static final int BUTTON_ALPHA_TRANSPARENT = 0; 144 145 /** 146 * The alpha for the increment/decrement button when it is opaque. 147 */ 148 private static final int BUTTON_ALPHA_OPAQUE = 1; 149 150 /** 151 * The property for setting the selector paint. 152 */ 153 private static final String PROPERTY_SELECTOR_PAINT_ALPHA = "selectorPaintAlpha"; 154 155 /** 156 * The property for setting the increment/decrement button alpha. 157 */ 158 private static final String PROPERTY_BUTTON_ALPHA = "alpha"; 159 160 /** 161 * The numbers accepted by the input text's {@link Filter} 162 */ 163 private static final char[] DIGIT_CHARACTERS = new char[] { 164 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' 165 }; 166 167 /** 168 * Constant for unspecified size. 169 */ 170 private static final int SIZE_UNSPECIFIED = -1; 171 172 /** 173 * Use a custom NumberPicker formatting callback to use two-digit minutes 174 * strings like "01". Keeping a static formatter etc. is the most efficient 175 * way to do this; it avoids creating temporary objects on every call to 176 * format(). 177 * 178 * @hide 179 */ 180 public static final NumberPicker.Formatter TWO_DIGIT_FORMATTER = new NumberPicker.Formatter() { 181 final StringBuilder mBuilder = new StringBuilder(); 182 183 final java.util.Formatter mFmt = new java.util.Formatter(mBuilder, java.util.Locale.US); 184 185 final Object[] mArgs = new Object[1]; 186 187 public String format(int value) { 188 mArgs[0] = value; 189 mBuilder.delete(0, mBuilder.length()); 190 mFmt.format("%02d", mArgs); 191 return mFmt.toString(); 192 } 193 }; 194 195 /** 196 * The increment button. 197 */ 198 private final ImageButton mIncrementButton; 199 200 /** 201 * The decrement button. 202 */ 203 private final ImageButton mDecrementButton; 204 205 /** 206 * The text for showing the current value. 207 */ 208 private final EditText mInputText; 209 210 /** 211 * The min height of this widget. 212 */ 213 private final int mMinHeight; 214 215 /** 216 * The max height of this widget. 217 */ 218 private final int mMaxHeight; 219 220 /** 221 * The max width of this widget. 222 */ 223 private final int mMinWidth; 224 225 /** 226 * The max width of this widget. 227 */ 228 private int mMaxWidth; 229 230 /** 231 * Flag whether to compute the max width. 232 */ 233 private final boolean mComputeMaxWidth; 234 235 /** 236 * The height of the text. 237 */ 238 private final int mTextSize; 239 240 /** 241 * The height of the gap between text elements if the selector wheel. 242 */ 243 private int mSelectorTextGapHeight; 244 245 /** 246 * The values to be displayed instead the indices. 247 */ 248 private String[] mDisplayedValues; 249 250 /** 251 * Lower value of the range of numbers allowed for the NumberPicker 252 */ 253 private int mMinValue; 254 255 /** 256 * Upper value of the range of numbers allowed for the NumberPicker 257 */ 258 private int mMaxValue; 259 260 /** 261 * Current value of this NumberPicker 262 */ 263 private int mValue; 264 265 /** 266 * Listener to be notified upon current value change. 267 */ 268 private OnValueChangeListener mOnValueChangeListener; 269 270 /** 271 * Listener to be notified upon scroll state change. 272 */ 273 private OnScrollListener mOnScrollListener; 274 275 /** 276 * Formatter for for displaying the current value. 277 */ 278 private Formatter mFormatter; 279 280 /** 281 * The speed for updating the value form long press. 282 */ 283 private long mLongPressUpdateInterval = DEFAULT_LONG_PRESS_UPDATE_INTERVAL; 284 285 /** 286 * Cache for the string representation of selector indices. 287 */ 288 private final SparseArray<String> mSelectorIndexToStringCache = new SparseArray<String>(); 289 290 /** 291 * The selector indices whose value are show by the selector. 292 */ 293 private final int[] mSelectorIndices = new int[] { 294 Integer.MIN_VALUE, Integer.MIN_VALUE, Integer.MIN_VALUE, Integer.MIN_VALUE, 295 Integer.MIN_VALUE 296 }; 297 298 /** 299 * The {@link Paint} for drawing the selector. 300 */ 301 private final Paint mSelectorWheelPaint; 302 303 /** 304 * The height of a selector element (text + gap). 305 */ 306 private int mSelectorElementHeight; 307 308 /** 309 * The initial offset of the scroll selector. 310 */ 311 private int mInitialScrollOffset = Integer.MIN_VALUE; 312 313 /** 314 * The current offset of the scroll selector. 315 */ 316 private int mCurrentScrollOffset; 317 318 /** 319 * The {@link Scroller} responsible for flinging the selector. 320 */ 321 private final Scroller mFlingScroller; 322 323 /** 324 * The {@link Scroller} responsible for adjusting the selector. 325 */ 326 private final Scroller mAdjustScroller; 327 328 /** 329 * The previous Y coordinate while scrolling the selector. 330 */ 331 private int mPreviousScrollerY; 332 333 /** 334 * Handle to the reusable command for setting the input text selection. 335 */ 336 private SetSelectionCommand mSetSelectionCommand; 337 338 /** 339 * Handle to the reusable command for adjusting the scroller. 340 */ 341 private AdjustScrollerCommand mAdjustScrollerCommand; 342 343 /** 344 * Handle to the reusable command for changing the current value from long 345 * press by one. 346 */ 347 private ChangeCurrentByOneFromLongPressCommand mChangeCurrentByOneFromLongPressCommand; 348 349 /** 350 * {@link Animator} for showing the up/down arrows. 351 */ 352 private final AnimatorSet mShowInputControlsAnimator; 353 354 /** 355 * {@link Animator} for dimming the selector wheel. 356 */ 357 private final Animator mDimSelectorWheelAnimator; 358 359 /** 360 * The Y position of the last down event. 361 */ 362 private float mLastDownEventY; 363 364 /** 365 * The Y position of the last motion event. 366 */ 367 private float mLastMotionEventY; 368 369 /** 370 * Flag if to begin edit on next up event. 371 */ 372 private boolean mBeginEditOnUpEvent; 373 374 /** 375 * Flag if to adjust the selector wheel on next up event. 376 */ 377 private boolean mAdjustScrollerOnUpEvent; 378 379 /** 380 * The state of the selector wheel. 381 */ 382 private int mSelectorWheelState; 383 384 /** 385 * Determines speed during touch scrolling. 386 */ 387 private VelocityTracker mVelocityTracker; 388 389 /** 390 * @see ViewConfiguration#getScaledTouchSlop() 391 */ 392 private int mTouchSlop; 393 394 /** 395 * @see ViewConfiguration#getScaledMinimumFlingVelocity() 396 */ 397 private int mMinimumFlingVelocity; 398 399 /** 400 * @see ViewConfiguration#getScaledMaximumFlingVelocity() 401 */ 402 private int mMaximumFlingVelocity; 403 404 /** 405 * Flag whether the selector should wrap around. 406 */ 407 private boolean mWrapSelectorWheel; 408 409 /** 410 * The back ground color used to optimize scroller fading. 411 */ 412 private final int mSolidColor; 413 414 /** 415 * Flag indicating if this widget supports flinging. 416 */ 417 private final boolean mFlingable; 418 419 /** 420 * Divider for showing item to be selected while scrolling 421 */ 422 private final Drawable mSelectionDivider; 423 424 /** 425 * The height of the selection divider. 426 */ 427 private final int mSelectionDividerHeight; 428 429 /** 430 * Reusable {@link Rect} instance. 431 */ 432 private final Rect mTempRect = new Rect(); 433 434 /** 435 * The current scroll state of the number picker. 436 */ 437 private int mScrollState = OnScrollListener.SCROLL_STATE_IDLE; 438 439 /** 440 * The duration of the animation for showing the input controls. 441 */ 442 private final long mShowInputControlsAnimimationDuration; 443 444 /** 445 * Flag whether the scoll wheel and the fading edges have been initialized. 446 */ 447 private boolean mScrollWheelAndFadingEdgesInitialized; 448 449 /** 450 * Interface to listen for changes of the current value. 451 */ 452 public interface OnValueChangeListener { 453 454 /** 455 * Called upon a change of the current value. 456 * 457 * @param picker The NumberPicker associated with this listener. 458 * @param oldVal The previous value. 459 * @param newVal The new value. 460 */ 461 void onValueChange(NumberPicker picker, int oldVal, int newVal); 462 } 463 464 /** 465 * Interface to listen for the picker scroll state. 466 */ 467 public interface OnScrollListener { 468 469 /** 470 * The view is not scrolling. 471 */ 472 public static int SCROLL_STATE_IDLE = 0; 473 474 /** 475 * The user is scrolling using touch, and their finger is still on the screen. 476 */ 477 public static int SCROLL_STATE_TOUCH_SCROLL = 1; 478 479 /** 480 * The user had previously been scrolling using touch and performed a fling. 481 */ 482 public static int SCROLL_STATE_FLING = 2; 483 484 /** 485 * Callback invoked while the number picker scroll state has changed. 486 * 487 * @param view The view whose scroll state is being reported. 488 * @param scrollState The current scroll state. One of 489 * {@link #SCROLL_STATE_IDLE}, 490 * {@link #SCROLL_STATE_TOUCH_SCROLL} or 491 * {@link #SCROLL_STATE_IDLE}. 492 */ 493 public void onScrollStateChange(NumberPicker view, int scrollState); 494 } 495 496 /** 497 * Interface used to format current value into a string for presentation. 498 */ 499 public interface Formatter { 500 501 /** 502 * Formats a string representation of the current value. 503 * 504 * @param value The currently selected value. 505 * @return A formatted string representation. 506 */ 507 public String format(int value); 508 } 509 510 /** 511 * Create a new number picker. 512 * 513 * @param context The application environment. 514 */ 515 public NumberPicker(Context context) { 516 this(context, null); 517 } 518 519 /** 520 * Create a new number picker. 521 * 522 * @param context The application environment. 523 * @param attrs A collection of attributes. 524 */ 525 public NumberPicker(Context context, AttributeSet attrs) { 526 this(context, attrs, R.attr.numberPickerStyle); 527 } 528 529 /** 530 * Create a new number picker 531 * 532 * @param context the application environment. 533 * @param attrs a collection of attributes. 534 * @param defStyle The default style to apply to this view. 535 */ 536 public NumberPicker(Context context, AttributeSet attrs, int defStyle) { 537 super(context, attrs, defStyle); 538 539 // process style attributes 540 TypedArray attributesArray = context.obtainStyledAttributes(attrs, 541 R.styleable.NumberPicker, defStyle, 0); 542 mSolidColor = attributesArray.getColor(R.styleable.NumberPicker_solidColor, 0); 543 mFlingable = attributesArray.getBoolean(R.styleable.NumberPicker_flingable, true); 544 mSelectionDivider = attributesArray.getDrawable(R.styleable.NumberPicker_selectionDivider); 545 int defSelectionDividerHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 546 UNSCALED_DEFAULT_SELECTION_DIVIDER_HEIGHT, 547 getResources().getDisplayMetrics()); 548 mSelectionDividerHeight = attributesArray.getDimensionPixelSize( 549 R.styleable.NumberPicker_selectionDividerHeight, defSelectionDividerHeight); 550 mMinHeight = attributesArray.getDimensionPixelSize(R.styleable.NumberPicker_minHeight, 551 SIZE_UNSPECIFIED); 552 mMaxHeight = attributesArray.getDimensionPixelSize(R.styleable.NumberPicker_maxHeight, 553 SIZE_UNSPECIFIED); 554 if (mMinHeight != SIZE_UNSPECIFIED && mMaxHeight != SIZE_UNSPECIFIED 555 && mMinHeight > mMaxHeight) { 556 throw new IllegalArgumentException("minHeight > maxHeight"); 557 } 558 mMinWidth = attributesArray.getDimensionPixelSize(R.styleable.NumberPicker_minWidth, 559 SIZE_UNSPECIFIED); 560 mMaxWidth = attributesArray.getDimensionPixelSize(R.styleable.NumberPicker_maxWidth, 561 SIZE_UNSPECIFIED); 562 if (mMinWidth != SIZE_UNSPECIFIED && mMaxWidth != SIZE_UNSPECIFIED 563 && mMinWidth > mMaxWidth) { 564 throw new IllegalArgumentException("minWidth > maxWidth"); 565 } 566 mComputeMaxWidth = (mMaxWidth == Integer.MAX_VALUE); 567 attributesArray.recycle(); 568 569 mShowInputControlsAnimimationDuration = getResources().getInteger( 570 R.integer.config_longAnimTime); 571 572 // By default Linearlayout that we extend is not drawn. This is 573 // its draw() method is not called but dispatchDraw() is called 574 // directly (see ViewGroup.drawChild()). However, this class uses 575 // the fading edge effect implemented by View and we need our 576 // draw() method to be called. Therefore, we declare we will draw. 577 setWillNotDraw(false); 578 setSelectorWheelState(SELECTOR_WHEEL_STATE_NONE); 579 580 LayoutInflater inflater = (LayoutInflater) getContext().getSystemService( 581 Context.LAYOUT_INFLATER_SERVICE); 582 inflater.inflate(R.layout.number_picker, this, true); 583 584 OnClickListener onClickListener = new OnClickListener() { 585 public void onClick(View v) { 586 hideSoftInput(); 587 mInputText.clearFocus(); 588 if (v.getId() == R.id.increment) { 589 changeCurrentByOne(true); 590 } else { 591 changeCurrentByOne(false); 592 } 593 } 594 }; 595 596 OnLongClickListener onLongClickListener = new OnLongClickListener() { 597 public boolean onLongClick(View v) { 598 hideSoftInput(); 599 mInputText.clearFocus(); 600 if (v.getId() == R.id.increment) { 601 postChangeCurrentByOneFromLongPress(true); 602 } else { 603 postChangeCurrentByOneFromLongPress(false); 604 } 605 return true; 606 } 607 }; 608 609 // increment button 610 mIncrementButton = (ImageButton) findViewById(R.id.increment); 611 mIncrementButton.setOnClickListener(onClickListener); 612 mIncrementButton.setOnLongClickListener(onLongClickListener); 613 614 // decrement button 615 mDecrementButton = (ImageButton) findViewById(R.id.decrement); 616 mDecrementButton.setOnClickListener(onClickListener); 617 mDecrementButton.setOnLongClickListener(onLongClickListener); 618 619 // input text 620 mInputText = (EditText) findViewById(R.id.numberpicker_input); 621 mInputText.setOnFocusChangeListener(new OnFocusChangeListener() { 622 public void onFocusChange(View v, boolean hasFocus) { 623 if (hasFocus) { 624 mInputText.selectAll(); 625 InputMethodManager inputMethodManager = InputMethodManager.peekInstance(); 626 if (inputMethodManager != null) { 627 inputMethodManager.showSoftInput(mInputText, 0); 628 } 629 } else { 630 mInputText.setSelection(0, 0); 631 validateInputTextView(v); 632 } 633 } 634 }); 635 mInputText.setFilters(new InputFilter[] { 636 new InputTextFilter() 637 }); 638 639 mInputText.setRawInputType(InputType.TYPE_CLASS_NUMBER); 640 641 // initialize constants 642 mTouchSlop = ViewConfiguration.getTapTimeout(); 643 ViewConfiguration configuration = ViewConfiguration.get(context); 644 mTouchSlop = configuration.getScaledTouchSlop(); 645 mMinimumFlingVelocity = configuration.getScaledMinimumFlingVelocity(); 646 mMaximumFlingVelocity = configuration.getScaledMaximumFlingVelocity() 647 / SELECTOR_MAX_FLING_VELOCITY_ADJUSTMENT; 648 mTextSize = (int) mInputText.getTextSize(); 649 650 // create the selector wheel paint 651 Paint paint = new Paint(); 652 paint.setAntiAlias(true); 653 paint.setTextAlign(Align.CENTER); 654 paint.setTextSize(mTextSize); 655 paint.setTypeface(mInputText.getTypeface()); 656 ColorStateList colors = mInputText.getTextColors(); 657 int color = colors.getColorForState(ENABLED_STATE_SET, Color.WHITE); 658 paint.setColor(color); 659 mSelectorWheelPaint = paint; 660 661 // create the animator for showing the input controls 662 mDimSelectorWheelAnimator = ObjectAnimator.ofInt(this, PROPERTY_SELECTOR_PAINT_ALPHA, 663 SELECTOR_WHEEL_BRIGHT_ALPHA, SELECTOR_WHEEL_DIM_ALPHA); 664 final ObjectAnimator showIncrementButton = ObjectAnimator.ofFloat(mIncrementButton, 665 PROPERTY_BUTTON_ALPHA, BUTTON_ALPHA_TRANSPARENT, BUTTON_ALPHA_OPAQUE); 666 final ObjectAnimator showDecrementButton = ObjectAnimator.ofFloat(mDecrementButton, 667 PROPERTY_BUTTON_ALPHA, BUTTON_ALPHA_TRANSPARENT, BUTTON_ALPHA_OPAQUE); 668 mShowInputControlsAnimator = new AnimatorSet(); 669 mShowInputControlsAnimator.playTogether(mDimSelectorWheelAnimator, showIncrementButton, 670 showDecrementButton); 671 mShowInputControlsAnimator.addListener(new AnimatorListenerAdapter() { 672 private boolean mCanceled = false; 673 674 @Override 675 public void onAnimationEnd(Animator animation) { 676 if (!mCanceled) { 677 // if canceled => we still want the wheel drawn 678 setSelectorWheelState(SELECTOR_WHEEL_STATE_SMALL); 679 } 680 mCanceled = false; 681 } 682 683 @Override 684 public void onAnimationCancel(Animator animation) { 685 if (mShowInputControlsAnimator.isRunning()) { 686 mCanceled = true; 687 } 688 } 689 }); 690 691 // create the fling and adjust scrollers 692 mFlingScroller = new Scroller(getContext(), null, true); 693 mAdjustScroller = new Scroller(getContext(), new DecelerateInterpolator(2.5f)); 694 695 updateInputTextView(); 696 updateIncrementAndDecrementButtonsVisibilityState(); 697 698 if (mFlingable) { 699 if (isInEditMode()) { 700 setSelectorWheelState(SELECTOR_WHEEL_STATE_SMALL); 701 } else { 702 // Start with shown selector wheel and hidden controls. When made 703 // visible hide the selector and fade-in the controls to suggest 704 // fling interaction. 705 setSelectorWheelState(SELECTOR_WHEEL_STATE_LARGE); 706 hideInputControls(); 707 } 708 } 709 } 710 711 @Override 712 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 713 final int msrdWdth = getMeasuredWidth(); 714 final int msrdHght = getMeasuredHeight(); 715 716 // Increment button at the top. 717 final int inctBtnMsrdWdth = mIncrementButton.getMeasuredWidth(); 718 final int incrBtnLeft = (msrdWdth - inctBtnMsrdWdth) / 2; 719 final int incrBtnTop = 0; 720 final int incrBtnRight = incrBtnLeft + inctBtnMsrdWdth; 721 final int incrBtnBottom = incrBtnTop + mIncrementButton.getMeasuredHeight(); 722 mIncrementButton.layout(incrBtnLeft, incrBtnTop, incrBtnRight, incrBtnBottom); 723 724 // Input text centered horizontally. 725 final int inptTxtMsrdWdth = mInputText.getMeasuredWidth(); 726 final int inptTxtMsrdHght = mInputText.getMeasuredHeight(); 727 final int inptTxtLeft = (msrdWdth - inptTxtMsrdWdth) / 2; 728 final int inptTxtTop = (msrdHght - inptTxtMsrdHght) / 2; 729 final int inptTxtRight = inptTxtLeft + inptTxtMsrdWdth; 730 final int inptTxtBottom = inptTxtTop + inptTxtMsrdHght; 731 mInputText.layout(inptTxtLeft, inptTxtTop, inptTxtRight, inptTxtBottom); 732 733 // Decrement button at the top. 734 final int decrBtnMsrdWdth = mIncrementButton.getMeasuredWidth(); 735 final int decrBtnLeft = (msrdWdth - decrBtnMsrdWdth) / 2; 736 final int decrBtnTop = msrdHght - mDecrementButton.getMeasuredHeight(); 737 final int decrBtnRight = decrBtnLeft + decrBtnMsrdWdth; 738 final int decrBtnBottom = msrdHght; 739 mDecrementButton.layout(decrBtnLeft, decrBtnTop, decrBtnRight, decrBtnBottom); 740 741 if (!mScrollWheelAndFadingEdgesInitialized) { 742 mScrollWheelAndFadingEdgesInitialized = true; 743 // need to do all this when we know our size 744 initializeSelectorWheel(); 745 initializeFadingEdges(); 746 } 747 } 748 749 @Override 750 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 751 // Try greedily to fit the max width and height. 752 final int newWidthMeasureSpec = makeMeasureSpec(widthMeasureSpec, mMaxWidth); 753 final int newHeightMeasureSpec = makeMeasureSpec(heightMeasureSpec, mMaxHeight); 754 super.onMeasure(newWidthMeasureSpec, newHeightMeasureSpec); 755 // Flag if we are measured with width or height less than the respective min. 756 final int widthSize = resolveSizeAndStateRespectingMinSize(mMinWidth, getMeasuredWidth(), 757 widthMeasureSpec); 758 final int heightSize = resolveSizeAndStateRespectingMinSize(mMinHeight, getMeasuredHeight(), 759 heightMeasureSpec); 760 setMeasuredDimension(widthSize, heightSize); 761 } 762 763 @Override 764 public boolean onInterceptTouchEvent(MotionEvent event) { 765 if (!isEnabled() || !mFlingable) { 766 return false; 767 } 768 switch (event.getActionMasked()) { 769 case MotionEvent.ACTION_DOWN: 770 mLastMotionEventY = mLastDownEventY = event.getY(); 771 removeAllCallbacks(); 772 mShowInputControlsAnimator.cancel(); 773 mDimSelectorWheelAnimator.cancel(); 774 mBeginEditOnUpEvent = false; 775 mAdjustScrollerOnUpEvent = true; 776 if (mSelectorWheelState == SELECTOR_WHEEL_STATE_LARGE) { 777 mSelectorWheelPaint.setAlpha(SELECTOR_WHEEL_BRIGHT_ALPHA); 778 boolean scrollersFinished = mFlingScroller.isFinished() 779 && mAdjustScroller.isFinished(); 780 if (!scrollersFinished) { 781 mFlingScroller.forceFinished(true); 782 mAdjustScroller.forceFinished(true); 783 onScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 784 } 785 mBeginEditOnUpEvent = scrollersFinished; 786 mAdjustScrollerOnUpEvent = true; 787 hideSoftInput(); 788 hideInputControls(); 789 return true; 790 } 791 if (isEventInVisibleViewHitRect(event, mIncrementButton) 792 || isEventInVisibleViewHitRect(event, mDecrementButton)) { 793 return false; 794 } 795 mAdjustScrollerOnUpEvent = false; 796 setSelectorWheelState(SELECTOR_WHEEL_STATE_LARGE); 797 hideSoftInput(); 798 hideInputControls(); 799 return true; 800 case MotionEvent.ACTION_MOVE: 801 float currentMoveY = event.getY(); 802 int deltaDownY = (int) Math.abs(currentMoveY - mLastDownEventY); 803 if (deltaDownY > mTouchSlop) { 804 mBeginEditOnUpEvent = false; 805 onScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL); 806 setSelectorWheelState(SELECTOR_WHEEL_STATE_LARGE); 807 hideSoftInput(); 808 hideInputControls(); 809 return true; 810 } 811 break; 812 } 813 return false; 814 } 815 816 @Override 817 public boolean onTouchEvent(MotionEvent ev) { 818 if (!isEnabled()) { 819 return false; 820 } 821 if (mVelocityTracker == null) { 822 mVelocityTracker = VelocityTracker.obtain(); 823 } 824 mVelocityTracker.addMovement(ev); 825 int action = ev.getActionMasked(); 826 switch (action) { 827 case MotionEvent.ACTION_MOVE: 828 float currentMoveY = ev.getY(); 829 if (mBeginEditOnUpEvent 830 || mScrollState != OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) { 831 int deltaDownY = (int) Math.abs(currentMoveY - mLastDownEventY); 832 if (deltaDownY > mTouchSlop) { 833 mBeginEditOnUpEvent = false; 834 onScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL); 835 } 836 } 837 int deltaMoveY = (int) (currentMoveY - mLastMotionEventY); 838 scrollBy(0, deltaMoveY); 839 invalidate(); 840 mLastMotionEventY = currentMoveY; 841 break; 842 case MotionEvent.ACTION_UP: 843 if (mBeginEditOnUpEvent) { 844 setSelectorWheelState(SELECTOR_WHEEL_STATE_SMALL); 845 showInputControls(mShowInputControlsAnimimationDuration); 846 mInputText.requestFocus(); 847 return true; 848 } 849 VelocityTracker velocityTracker = mVelocityTracker; 850 velocityTracker.computeCurrentVelocity(1000, mMaximumFlingVelocity); 851 int initialVelocity = (int) velocityTracker.getYVelocity(); 852 if (Math.abs(initialVelocity) > mMinimumFlingVelocity) { 853 fling(initialVelocity); 854 onScrollStateChange(OnScrollListener.SCROLL_STATE_FLING); 855 } else { 856 if (mAdjustScrollerOnUpEvent) { 857 if (mFlingScroller.isFinished() && mAdjustScroller.isFinished()) { 858 postAdjustScrollerCommand(0); 859 } 860 } else { 861 postAdjustScrollerCommand(SHOW_INPUT_CONTROLS_DELAY_MILLIS); 862 } 863 } 864 mVelocityTracker.recycle(); 865 mVelocityTracker = null; 866 break; 867 } 868 return true; 869 } 870 871 @Override 872 public boolean dispatchTouchEvent(MotionEvent event) { 873 final int action = event.getActionMasked(); 874 switch (action) { 875 case MotionEvent.ACTION_MOVE: 876 if (mSelectorWheelState == SELECTOR_WHEEL_STATE_LARGE) { 877 removeAllCallbacks(); 878 forceCompleteChangeCurrentByOneViaScroll(); 879 } 880 break; 881 case MotionEvent.ACTION_CANCEL: 882 case MotionEvent.ACTION_UP: 883 removeAllCallbacks(); 884 break; 885 } 886 return super.dispatchTouchEvent(event); 887 } 888 889 @Override 890 public boolean dispatchKeyEvent(KeyEvent event) { 891 int keyCode = event.getKeyCode(); 892 if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER || keyCode == KeyEvent.KEYCODE_ENTER) { 893 removeAllCallbacks(); 894 } 895 return super.dispatchKeyEvent(event); 896 } 897 898 @Override 899 public boolean dispatchTrackballEvent(MotionEvent event) { 900 int action = event.getActionMasked(); 901 if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) { 902 removeAllCallbacks(); 903 } 904 return super.dispatchTrackballEvent(event); 905 } 906 907 @Override 908 public void computeScroll() { 909 if (mSelectorWheelState == SELECTOR_WHEEL_STATE_NONE) { 910 return; 911 } 912 Scroller scroller = mFlingScroller; 913 if (scroller.isFinished()) { 914 scroller = mAdjustScroller; 915 if (scroller.isFinished()) { 916 return; 917 } 918 } 919 scroller.computeScrollOffset(); 920 int currentScrollerY = scroller.getCurrY(); 921 if (mPreviousScrollerY == 0) { 922 mPreviousScrollerY = scroller.getStartY(); 923 } 924 scrollBy(0, currentScrollerY - mPreviousScrollerY); 925 mPreviousScrollerY = currentScrollerY; 926 if (scroller.isFinished()) { 927 onScrollerFinished(scroller); 928 } else { 929 invalidate(); 930 } 931 } 932 933 @Override 934 public void setEnabled(boolean enabled) { 935 super.setEnabled(enabled); 936 mIncrementButton.setEnabled(enabled); 937 mDecrementButton.setEnabled(enabled); 938 mInputText.setEnabled(enabled); 939 } 940 941 @Override 942 public void scrollBy(int x, int y) { 943 if (mSelectorWheelState == SELECTOR_WHEEL_STATE_NONE) { 944 return; 945 } 946 int[] selectorIndices = mSelectorIndices; 947 if (!mWrapSelectorWheel && y > 0 948 && selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] <= mMinValue) { 949 mCurrentScrollOffset = mInitialScrollOffset; 950 return; 951 } 952 if (!mWrapSelectorWheel && y < 0 953 && selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] >= mMaxValue) { 954 mCurrentScrollOffset = mInitialScrollOffset; 955 return; 956 } 957 mCurrentScrollOffset += y; 958 while (mCurrentScrollOffset - mInitialScrollOffset > mSelectorTextGapHeight) { 959 mCurrentScrollOffset -= mSelectorElementHeight; 960 decrementSelectorIndices(selectorIndices); 961 changeCurrent(selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX]); 962 if (!mWrapSelectorWheel && selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] <= mMinValue) { 963 mCurrentScrollOffset = mInitialScrollOffset; 964 } 965 } 966 while (mCurrentScrollOffset - mInitialScrollOffset < -mSelectorTextGapHeight) { 967 mCurrentScrollOffset += mSelectorElementHeight; 968 incrementSelectorIndices(selectorIndices); 969 changeCurrent(selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX]); 970 if (!mWrapSelectorWheel && selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] >= mMaxValue) { 971 mCurrentScrollOffset = mInitialScrollOffset; 972 } 973 } 974 } 975 976 @Override 977 public int getSolidColor() { 978 return mSolidColor; 979 } 980 981 /** 982 * Sets the listener to be notified on change of the current value. 983 * 984 * @param onValueChangedListener The listener. 985 */ 986 public void setOnValueChangedListener(OnValueChangeListener onValueChangedListener) { 987 mOnValueChangeListener = onValueChangedListener; 988 } 989 990 /** 991 * Set listener to be notified for scroll state changes. 992 * 993 * @param onScrollListener The listener. 994 */ 995 public void setOnScrollListener(OnScrollListener onScrollListener) { 996 mOnScrollListener = onScrollListener; 997 } 998 999 /** 1000 * Set the formatter to be used for formatting the current value. 1001 * <p> 1002 * Note: If you have provided alternative values for the values this 1003 * formatter is never invoked. 1004 * </p> 1005 * 1006 * @param formatter The formatter object. If formatter is <code>null</code>, 1007 * {@link String#valueOf(int)} will be used. 1008 * 1009 * @see #setDisplayedValues(String[]) 1010 */ 1011 public void setFormatter(Formatter formatter) { 1012 if (formatter == mFormatter) { 1013 return; 1014 } 1015 mFormatter = formatter; 1016 initializeSelectorWheelIndices(); 1017 updateInputTextView(); 1018 } 1019 1020 /** 1021 * Set the current value for the number picker. 1022 * <p> 1023 * If the argument is less than the {@link NumberPicker#getMinValue()} and 1024 * {@link NumberPicker#getWrapSelectorWheel()} is <code>false</code> the 1025 * current value is set to the {@link NumberPicker#getMinValue()} value. 1026 * </p> 1027 * <p> 1028 * If the argument is less than the {@link NumberPicker#getMinValue()} and 1029 * {@link NumberPicker#getWrapSelectorWheel()} is <code>true</code> the 1030 * current value is set to the {@link NumberPicker#getMaxValue()} value. 1031 * </p> 1032 * <p> 1033 * If the argument is less than the {@link NumberPicker#getMaxValue()} and 1034 * {@link NumberPicker#getWrapSelectorWheel()} is <code>false</code> the 1035 * current value is set to the {@link NumberPicker#getMaxValue()} value. 1036 * </p> 1037 * <p> 1038 * If the argument is less than the {@link NumberPicker#getMaxValue()} and 1039 * {@link NumberPicker#getWrapSelectorWheel()} is <code>true</code> the 1040 * current value is set to the {@link NumberPicker#getMinValue()} value. 1041 * </p> 1042 * 1043 * @param value The current value. 1044 * @see #setWrapSelectorWheel(boolean) 1045 * @see #setMinValue(int) 1046 * @see #setMaxValue(int) 1047 */ 1048 public void setValue(int value) { 1049 if (mValue == value) { 1050 return; 1051 } 1052 if (value < mMinValue) { 1053 value = mWrapSelectorWheel ? mMaxValue : mMinValue; 1054 } 1055 if (value > mMaxValue) { 1056 value = mWrapSelectorWheel ? mMinValue : mMaxValue; 1057 } 1058 mValue = value; 1059 initializeSelectorWheelIndices(); 1060 updateInputTextView(); 1061 updateIncrementAndDecrementButtonsVisibilityState(); 1062 invalidate(); 1063 } 1064 1065 /** 1066 * Hides the soft input of it is active for the input text. 1067 */ 1068 private void hideSoftInput() { 1069 InputMethodManager inputMethodManager = InputMethodManager.peekInstance(); 1070 if (inputMethodManager != null && inputMethodManager.isActive(mInputText)) { 1071 inputMethodManager.hideSoftInputFromWindow(getWindowToken(), 0); 1072 } 1073 } 1074 1075 /** 1076 * Computes the max width if no such specified as an attribute. 1077 */ 1078 private void tryComputeMaxWidth() { 1079 if (!mComputeMaxWidth) { 1080 return; 1081 } 1082 int maxTextWidth = 0; 1083 if (mDisplayedValues == null) { 1084 float maxDigitWidth = 0; 1085 for (int i = 0; i <= 9; i++) { 1086 final float digitWidth = mSelectorWheelPaint.measureText(String.valueOf(i)); 1087 if (digitWidth > maxDigitWidth) { 1088 maxDigitWidth = digitWidth; 1089 } 1090 } 1091 int numberOfDigits = 0; 1092 int current = mMaxValue; 1093 while (current > 0) { 1094 numberOfDigits++; 1095 current = current / 10; 1096 } 1097 maxTextWidth = (int) (numberOfDigits * maxDigitWidth); 1098 } else { 1099 final int valueCount = mDisplayedValues.length; 1100 for (int i = 0; i < valueCount; i++) { 1101 final float textWidth = mSelectorWheelPaint.measureText(mDisplayedValues[i]); 1102 if (textWidth > maxTextWidth) { 1103 maxTextWidth = (int) textWidth; 1104 } 1105 } 1106 } 1107 maxTextWidth += mInputText.getPaddingLeft() + mInputText.getPaddingRight(); 1108 if (mMaxWidth != maxTextWidth) { 1109 if (maxTextWidth > mMinWidth) { 1110 mMaxWidth = maxTextWidth; 1111 } else { 1112 mMaxWidth = mMinWidth; 1113 } 1114 invalidate(); 1115 } 1116 } 1117 1118 /** 1119 * Gets whether the selector wheel wraps when reaching the min/max value. 1120 * 1121 * @return True if the selector wheel wraps. 1122 * 1123 * @see #getMinValue() 1124 * @see #getMaxValue() 1125 */ 1126 public boolean getWrapSelectorWheel() { 1127 return mWrapSelectorWheel; 1128 } 1129 1130 /** 1131 * Sets whether the selector wheel shown during flinging/scrolling should 1132 * wrap around the {@link NumberPicker#getMinValue()} and 1133 * {@link NumberPicker#getMaxValue()} values. 1134 * <p> 1135 * By default if the range (max - min) is more than five (the number of 1136 * items shown on the selector wheel) the selector wheel wrapping is 1137 * enabled. 1138 * </p> 1139 * 1140 * @param wrapSelectorWheel Whether to wrap. 1141 */ 1142 public void setWrapSelectorWheel(boolean wrapSelectorWheel) { 1143 if (wrapSelectorWheel && (mMaxValue - mMinValue) < mSelectorIndices.length) { 1144 throw new IllegalStateException("Range less than selector items count."); 1145 } 1146 if (wrapSelectorWheel != mWrapSelectorWheel) { 1147 mWrapSelectorWheel = wrapSelectorWheel; 1148 updateIncrementAndDecrementButtonsVisibilityState(); 1149 } 1150 } 1151 1152 /** 1153 * Sets the speed at which the numbers be incremented and decremented when 1154 * the up and down buttons are long pressed respectively. 1155 * <p> 1156 * The default value is 300 ms. 1157 * </p> 1158 * 1159 * @param intervalMillis The speed (in milliseconds) at which the numbers 1160 * will be incremented and decremented. 1161 */ 1162 public void setOnLongPressUpdateInterval(long intervalMillis) { 1163 mLongPressUpdateInterval = intervalMillis; 1164 } 1165 1166 /** 1167 * Returns the value of the picker. 1168 * 1169 * @return The value. 1170 */ 1171 public int getValue() { 1172 return mValue; 1173 } 1174 1175 /** 1176 * Returns the min value of the picker. 1177 * 1178 * @return The min value 1179 */ 1180 public int getMinValue() { 1181 return mMinValue; 1182 } 1183 1184 /** 1185 * Sets the min value of the picker. 1186 * 1187 * @param minValue The min value. 1188 */ 1189 public void setMinValue(int minValue) { 1190 if (mMinValue == minValue) { 1191 return; 1192 } 1193 if (minValue < 0) { 1194 throw new IllegalArgumentException("minValue must be >= 0"); 1195 } 1196 mMinValue = minValue; 1197 if (mMinValue > mValue) { 1198 mValue = mMinValue; 1199 } 1200 boolean wrapSelectorWheel = mMaxValue - mMinValue > mSelectorIndices.length; 1201 setWrapSelectorWheel(wrapSelectorWheel); 1202 initializeSelectorWheelIndices(); 1203 updateInputTextView(); 1204 tryComputeMaxWidth(); 1205 } 1206 1207 /** 1208 * Returns the max value of the picker. 1209 * 1210 * @return The max value. 1211 */ 1212 public int getMaxValue() { 1213 return mMaxValue; 1214 } 1215 1216 /** 1217 * Sets the max value of the picker. 1218 * 1219 * @param maxValue The max value. 1220 */ 1221 public void setMaxValue(int maxValue) { 1222 if (mMaxValue == maxValue) { 1223 return; 1224 } 1225 if (maxValue < 0) { 1226 throw new IllegalArgumentException("maxValue must be >= 0"); 1227 } 1228 mMaxValue = maxValue; 1229 if (mMaxValue < mValue) { 1230 mValue = mMaxValue; 1231 } 1232 boolean wrapSelectorWheel = mMaxValue - mMinValue > mSelectorIndices.length; 1233 setWrapSelectorWheel(wrapSelectorWheel); 1234 initializeSelectorWheelIndices(); 1235 updateInputTextView(); 1236 tryComputeMaxWidth(); 1237 } 1238 1239 /** 1240 * Gets the values to be displayed instead of string values. 1241 * 1242 * @return The displayed values. 1243 */ 1244 public String[] getDisplayedValues() { 1245 return mDisplayedValues; 1246 } 1247 1248 /** 1249 * Sets the values to be displayed. 1250 * 1251 * @param displayedValues The displayed values. 1252 */ 1253 public void setDisplayedValues(String[] displayedValues) { 1254 if (mDisplayedValues == displayedValues) { 1255 return; 1256 } 1257 mDisplayedValues = displayedValues; 1258 if (mDisplayedValues != null) { 1259 // Allow text entry rather than strictly numeric entry. 1260 mInputText.setRawInputType(InputType.TYPE_CLASS_TEXT 1261 | InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS); 1262 } else { 1263 mInputText.setRawInputType(InputType.TYPE_CLASS_NUMBER); 1264 } 1265 updateInputTextView(); 1266 initializeSelectorWheelIndices(); 1267 tryComputeMaxWidth(); 1268 } 1269 1270 @Override 1271 protected float getTopFadingEdgeStrength() { 1272 return TOP_AND_BOTTOM_FADING_EDGE_STRENGTH; 1273 } 1274 1275 @Override 1276 protected float getBottomFadingEdgeStrength() { 1277 return TOP_AND_BOTTOM_FADING_EDGE_STRENGTH; 1278 } 1279 1280 @Override 1281 protected void onAttachedToWindow() { 1282 super.onAttachedToWindow(); 1283 // make sure we show the controls only the very 1284 // first time the user sees this widget 1285 if (mFlingable && !isInEditMode()) { 1286 // animate a bit slower the very first time 1287 showInputControls(mShowInputControlsAnimimationDuration * 2); 1288 } 1289 } 1290 1291 @Override 1292 protected void onDetachedFromWindow() { 1293 removeAllCallbacks(); 1294 } 1295 1296 @Override 1297 protected void dispatchDraw(Canvas canvas) { 1298 // There is a good reason for doing this. See comments in draw(). 1299 } 1300 1301 @Override 1302 public void draw(Canvas canvas) { 1303 // Dispatch draw to our children only if we are not currently running 1304 // the animation for simultaneously dimming the scroll wheel and 1305 // showing in the buttons. This class takes advantage of the View 1306 // implementation of fading edges effect to draw the selector wheel. 1307 // However, in View.draw(), the fading is applied after all the children 1308 // have been drawn and we do not want this fading to be applied to the 1309 // buttons. Therefore, we draw our children after we have completed 1310 // drawing ourselves. 1311 super.draw(canvas); 1312 1313 // Draw our children if we are not showing the selector wheel of fading 1314 // it out 1315 if (mShowInputControlsAnimator.isRunning() 1316 || mSelectorWheelState != SELECTOR_WHEEL_STATE_LARGE) { 1317 long drawTime = getDrawingTime(); 1318 for (int i = 0, count = getChildCount(); i < count; i++) { 1319 View child = getChildAt(i); 1320 if (!child.isShown()) { 1321 continue; 1322 } 1323 drawChild(canvas, getChildAt(i), drawTime); 1324 } 1325 } 1326 } 1327 1328 @Override 1329 protected void onDraw(Canvas canvas) { 1330 if (mSelectorWheelState == SELECTOR_WHEEL_STATE_NONE) { 1331 return; 1332 } 1333 1334 float x = (mRight - mLeft) / 2; 1335 float y = mCurrentScrollOffset; 1336 1337 final int restoreCount = canvas.save(); 1338 1339 if (mSelectorWheelState == SELECTOR_WHEEL_STATE_SMALL) { 1340 Rect clipBounds = canvas.getClipBounds(); 1341 clipBounds.inset(0, mSelectorElementHeight); 1342 canvas.clipRect(clipBounds); 1343 } 1344 1345 // draw the selector wheel 1346 int[] selectorIndices = mSelectorIndices; 1347 for (int i = 0; i < selectorIndices.length; i++) { 1348 int selectorIndex = selectorIndices[i]; 1349 String scrollSelectorValue = mSelectorIndexToStringCache.get(selectorIndex); 1350 // Do not draw the middle item if input is visible since the input is shown only 1351 // if the wheel is static and it covers the middle item. Otherwise, if the user 1352 // starts editing the text via the IME he may see a dimmed version of the old 1353 // value intermixed with the new one. 1354 if (i != SELECTOR_MIDDLE_ITEM_INDEX || mInputText.getVisibility() != VISIBLE) { 1355 canvas.drawText(scrollSelectorValue, x, y, mSelectorWheelPaint); 1356 } 1357 y += mSelectorElementHeight; 1358 } 1359 1360 // draw the selection dividers (only if scrolling and drawable specified) 1361 if (mSelectionDivider != null) { 1362 // draw the top divider 1363 int topOfTopDivider = 1364 (getHeight() - mSelectorElementHeight - mSelectionDividerHeight) / 2; 1365 int bottomOfTopDivider = topOfTopDivider + mSelectionDividerHeight; 1366 mSelectionDivider.setBounds(0, topOfTopDivider, mRight, bottomOfTopDivider); 1367 mSelectionDivider.draw(canvas); 1368 1369 // draw the bottom divider 1370 int topOfBottomDivider = topOfTopDivider + mSelectorElementHeight; 1371 int bottomOfBottomDivider = bottomOfTopDivider + mSelectorElementHeight; 1372 mSelectionDivider.setBounds(0, topOfBottomDivider, mRight, bottomOfBottomDivider); 1373 mSelectionDivider.draw(canvas); 1374 } 1375 1376 canvas.restoreToCount(restoreCount); 1377 } 1378 1379 @Override 1380 public void sendAccessibilityEvent(int eventType) { 1381 // Do not send accessibility events - we want the user to 1382 // perceive this widget as several controls rather as a whole. 1383 } 1384 1385 /** 1386 * Makes a measure spec that tries greedily to use the max value. 1387 * 1388 * @param measureSpec The measure spec. 1389 * @param maxSize The max value for the size. 1390 * @return A measure spec greedily imposing the max size. 1391 */ 1392 private int makeMeasureSpec(int measureSpec, int maxSize) { 1393 if (maxSize == SIZE_UNSPECIFIED) { 1394 return measureSpec; 1395 } 1396 final int size = MeasureSpec.getSize(measureSpec); 1397 final int mode = MeasureSpec.getMode(measureSpec); 1398 switch (mode) { 1399 case MeasureSpec.EXACTLY: 1400 return measureSpec; 1401 case MeasureSpec.AT_MOST: 1402 return MeasureSpec.makeMeasureSpec(Math.min(size, maxSize), MeasureSpec.EXACTLY); 1403 case MeasureSpec.UNSPECIFIED: 1404 return MeasureSpec.makeMeasureSpec(maxSize, MeasureSpec.EXACTLY); 1405 default: 1406 throw new IllegalArgumentException("Unknown measure mode: " + mode); 1407 } 1408 } 1409 1410 /** 1411 * Utility to reconcile a desired size and state, with constraints imposed by 1412 * a MeasureSpec. Tries to respect the min size, unless a different size is 1413 * imposed by the constraints. 1414 * 1415 * @param minSize The minimal desired size. 1416 * @param measuredSize The currently measured size. 1417 * @param measureSpec The current measure spec. 1418 * @return The resolved size and state. 1419 */ 1420 private int resolveSizeAndStateRespectingMinSize(int minSize, int measuredSize, 1421 int measureSpec) { 1422 if (minSize != SIZE_UNSPECIFIED) { 1423 final int desiredWidth = Math.max(minSize, measuredSize); 1424 return resolveSizeAndState(desiredWidth, measureSpec, 0); 1425 } else { 1426 return measuredSize; 1427 } 1428 } 1429 1430 /** 1431 * Resets the selector indices and clear the cached 1432 * string representation of these indices. 1433 */ 1434 private void initializeSelectorWheelIndices() { 1435 mSelectorIndexToStringCache.clear(); 1436 int[] selectorIdices = mSelectorIndices; 1437 int current = getValue(); 1438 for (int i = 0; i < mSelectorIndices.length; i++) { 1439 int selectorIndex = current + (i - SELECTOR_MIDDLE_ITEM_INDEX); 1440 if (mWrapSelectorWheel) { 1441 selectorIndex = getWrappedSelectorIndex(selectorIndex); 1442 } 1443 mSelectorIndices[i] = selectorIndex; 1444 ensureCachedScrollSelectorValue(mSelectorIndices[i]); 1445 } 1446 } 1447 1448 /** 1449 * Sets the current value of this NumberPicker, and sets mPrevious to the 1450 * previous value. If current is greater than mEnd less than mStart, the 1451 * value of mCurrent is wrapped around. Subclasses can override this to 1452 * change the wrapping behavior 1453 * 1454 * @param current the new value of the NumberPicker 1455 */ 1456 private void changeCurrent(int current) { 1457 if (mValue == current) { 1458 return; 1459 } 1460 // Wrap around the values if we go past the start or end 1461 if (mWrapSelectorWheel) { 1462 current = getWrappedSelectorIndex(current); 1463 } 1464 int previous = mValue; 1465 setValue(current); 1466 notifyChange(previous, current); 1467 } 1468 1469 /** 1470 * Changes the current value by one which is increment or 1471 * decrement based on the passes argument. 1472 * 1473 * @param increment True to increment, false to decrement. 1474 */ 1475 private void changeCurrentByOne(boolean increment) { 1476 if (mFlingable) { 1477 mDimSelectorWheelAnimator.cancel(); 1478 mInputText.setVisibility(View.INVISIBLE); 1479 mSelectorWheelPaint.setAlpha(SELECTOR_WHEEL_BRIGHT_ALPHA); 1480 mPreviousScrollerY = 0; 1481 forceCompleteChangeCurrentByOneViaScroll(); 1482 if (increment) { 1483 mFlingScroller.startScroll(0, 0, 0, -mSelectorElementHeight, 1484 CHANGE_CURRENT_BY_ONE_SCROLL_DURATION); 1485 } else { 1486 mFlingScroller.startScroll(0, 0, 0, mSelectorElementHeight, 1487 CHANGE_CURRENT_BY_ONE_SCROLL_DURATION); 1488 } 1489 invalidate(); 1490 } else { 1491 if (increment) { 1492 changeCurrent(mValue + 1); 1493 } else { 1494 changeCurrent(mValue - 1); 1495 } 1496 } 1497 } 1498 1499 /** 1500 * Ensures that if we are in the process of changing the current value 1501 * by one via scrolling the scroller gets to its final state and the 1502 * value is updated. 1503 */ 1504 private void forceCompleteChangeCurrentByOneViaScroll() { 1505 Scroller scroller = mFlingScroller; 1506 if (!scroller.isFinished()) { 1507 final int yBeforeAbort = scroller.getCurrY(); 1508 scroller.abortAnimation(); 1509 final int yDelta = scroller.getCurrY() - yBeforeAbort; 1510 scrollBy(0, yDelta); 1511 } 1512 } 1513 1514 /** 1515 * Sets the <code>alpha</code> of the {@link Paint} for drawing the selector 1516 * wheel. 1517 */ 1518 @SuppressWarnings("unused") 1519 // Called via reflection 1520 private void setSelectorPaintAlpha(int alpha) { 1521 mSelectorWheelPaint.setAlpha(alpha); 1522 invalidate(); 1523 } 1524 1525 /** 1526 * @return If the <code>event</code> is in the visible <code>view</code>. 1527 */ 1528 private boolean isEventInVisibleViewHitRect(MotionEvent event, View view) { 1529 if (view.getVisibility() == VISIBLE) { 1530 view.getHitRect(mTempRect); 1531 return mTempRect.contains((int) event.getX(), (int) event.getY()); 1532 } 1533 return false; 1534 } 1535 1536 /** 1537 * Sets the <code>selectorWheelState</code>. 1538 */ 1539 private void setSelectorWheelState(int selectorWheelState) { 1540 mSelectorWheelState = selectorWheelState; 1541 if (selectorWheelState == SELECTOR_WHEEL_STATE_LARGE) { 1542 mSelectorWheelPaint.setAlpha(SELECTOR_WHEEL_BRIGHT_ALPHA); 1543 } 1544 1545 if (mFlingable && selectorWheelState == SELECTOR_WHEEL_STATE_LARGE 1546 && AccessibilityManager.getInstance(mContext).isEnabled()) { 1547 AccessibilityManager.getInstance(mContext).interrupt(); 1548 String text = mContext.getString(R.string.number_picker_increment_scroll_action); 1549 mInputText.setContentDescription(text); 1550 mInputText.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED); 1551 mInputText.setContentDescription(null); 1552 } 1553 } 1554 1555 private void initializeSelectorWheel() { 1556 initializeSelectorWheelIndices(); 1557 int[] selectorIndices = mSelectorIndices; 1558 int totalTextHeight = selectorIndices.length * mTextSize; 1559 float totalTextGapHeight = (mBottom - mTop) - totalTextHeight; 1560 float textGapCount = selectorIndices.length - 1; 1561 mSelectorTextGapHeight = (int) (totalTextGapHeight / textGapCount + 0.5f); 1562 mSelectorElementHeight = mTextSize + mSelectorTextGapHeight; 1563 // Ensure that the middle item is positioned the same as the text in mInputText 1564 int editTextTextPosition = mInputText.getBaseline() + mInputText.getTop(); 1565 mInitialScrollOffset = editTextTextPosition - 1566 (mSelectorElementHeight * SELECTOR_MIDDLE_ITEM_INDEX); 1567 mCurrentScrollOffset = mInitialScrollOffset; 1568 updateInputTextView(); 1569 } 1570 1571 private void initializeFadingEdges() { 1572 setVerticalFadingEdgeEnabled(true); 1573 setFadingEdgeLength((mBottom - mTop - mTextSize) / 2); 1574 } 1575 1576 /** 1577 * Callback invoked upon completion of a given <code>scroller</code>. 1578 */ 1579 private void onScrollerFinished(Scroller scroller) { 1580 if (scroller == mFlingScroller) { 1581 if (mSelectorWheelState == SELECTOR_WHEEL_STATE_LARGE) { 1582 postAdjustScrollerCommand(0); 1583 onScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 1584 } else { 1585 updateInputTextView(); 1586 fadeSelectorWheel(mShowInputControlsAnimimationDuration); 1587 } 1588 } else { 1589 updateInputTextView(); 1590 showInputControls(mShowInputControlsAnimimationDuration); 1591 } 1592 } 1593 1594 /** 1595 * Handles transition to a given <code>scrollState</code> 1596 */ 1597 private void onScrollStateChange(int scrollState) { 1598 if (mScrollState == scrollState) { 1599 return; 1600 } 1601 mScrollState = scrollState; 1602 if (mOnScrollListener != null) { 1603 mOnScrollListener.onScrollStateChange(this, scrollState); 1604 } 1605 } 1606 1607 /** 1608 * Flings the selector with the given <code>velocityY</code>. 1609 */ 1610 private void fling(int velocityY) { 1611 mPreviousScrollerY = 0; 1612 1613 if (velocityY > 0) { 1614 mFlingScroller.fling(0, 0, 0, velocityY, 0, 0, 0, Integer.MAX_VALUE); 1615 } else { 1616 mFlingScroller.fling(0, Integer.MAX_VALUE, 0, velocityY, 0, 0, 0, Integer.MAX_VALUE); 1617 } 1618 1619 invalidate(); 1620 } 1621 1622 /** 1623 * Hides the input controls which is the up/down arrows and the text field. 1624 */ 1625 private void hideInputControls() { 1626 mShowInputControlsAnimator.cancel(); 1627 mIncrementButton.setVisibility(INVISIBLE); 1628 mDecrementButton.setVisibility(INVISIBLE); 1629 mInputText.setVisibility(INVISIBLE); 1630 } 1631 1632 /** 1633 * Show the input controls by making them visible and animating the alpha 1634 * property up/down arrows. 1635 * 1636 * @param animationDuration The duration of the animation. 1637 */ 1638 private void showInputControls(long animationDuration) { 1639 updateIncrementAndDecrementButtonsVisibilityState(); 1640 mInputText.setVisibility(VISIBLE); 1641 mShowInputControlsAnimator.setDuration(animationDuration); 1642 mShowInputControlsAnimator.start(); 1643 } 1644 1645 /** 1646 * Fade the selector wheel via an animation. 1647 * 1648 * @param animationDuration The duration of the animation. 1649 */ 1650 private void fadeSelectorWheel(long animationDuration) { 1651 mInputText.setVisibility(VISIBLE); 1652 mDimSelectorWheelAnimator.setDuration(animationDuration); 1653 mDimSelectorWheelAnimator.start(); 1654 } 1655 1656 /** 1657 * Updates the visibility state of the increment and decrement buttons. 1658 */ 1659 private void updateIncrementAndDecrementButtonsVisibilityState() { 1660 if (mWrapSelectorWheel || mValue < mMaxValue) { 1661 mIncrementButton.setVisibility(VISIBLE); 1662 } else { 1663 mIncrementButton.setVisibility(INVISIBLE); 1664 } 1665 if (mWrapSelectorWheel || mValue > mMinValue) { 1666 mDecrementButton.setVisibility(VISIBLE); 1667 } else { 1668 mDecrementButton.setVisibility(INVISIBLE); 1669 } 1670 } 1671 1672 /** 1673 * @return The wrapped index <code>selectorIndex</code> value. 1674 */ 1675 private int getWrappedSelectorIndex(int selectorIndex) { 1676 if (selectorIndex > mMaxValue) { 1677 return mMinValue + (selectorIndex - mMaxValue) % (mMaxValue - mMinValue) - 1; 1678 } else if (selectorIndex < mMinValue) { 1679 return mMaxValue - (mMinValue - selectorIndex) % (mMaxValue - mMinValue) + 1; 1680 } 1681 return selectorIndex; 1682 } 1683 1684 /** 1685 * Increments the <code>selectorIndices</code> whose string representations 1686 * will be displayed in the selector. 1687 */ 1688 private void incrementSelectorIndices(int[] selectorIndices) { 1689 for (int i = 0; i < selectorIndices.length - 1; i++) { 1690 selectorIndices[i] = selectorIndices[i + 1]; 1691 } 1692 int nextScrollSelectorIndex = selectorIndices[selectorIndices.length - 2] + 1; 1693 if (mWrapSelectorWheel && nextScrollSelectorIndex > mMaxValue) { 1694 nextScrollSelectorIndex = mMinValue; 1695 } 1696 selectorIndices[selectorIndices.length - 1] = nextScrollSelectorIndex; 1697 ensureCachedScrollSelectorValue(nextScrollSelectorIndex); 1698 } 1699 1700 /** 1701 * Decrements the <code>selectorIndices</code> whose string representations 1702 * will be displayed in the selector. 1703 */ 1704 private void decrementSelectorIndices(int[] selectorIndices) { 1705 for (int i = selectorIndices.length - 1; i > 0; i--) { 1706 selectorIndices[i] = selectorIndices[i - 1]; 1707 } 1708 int nextScrollSelectorIndex = selectorIndices[1] - 1; 1709 if (mWrapSelectorWheel && nextScrollSelectorIndex < mMinValue) { 1710 nextScrollSelectorIndex = mMaxValue; 1711 } 1712 selectorIndices[0] = nextScrollSelectorIndex; 1713 ensureCachedScrollSelectorValue(nextScrollSelectorIndex); 1714 } 1715 1716 /** 1717 * Ensures we have a cached string representation of the given <code> 1718 * selectorIndex</code> 1719 * to avoid multiple instantiations of the same string. 1720 */ 1721 private void ensureCachedScrollSelectorValue(int selectorIndex) { 1722 SparseArray<String> cache = mSelectorIndexToStringCache; 1723 String scrollSelectorValue = cache.get(selectorIndex); 1724 if (scrollSelectorValue != null) { 1725 return; 1726 } 1727 if (selectorIndex < mMinValue || selectorIndex > mMaxValue) { 1728 scrollSelectorValue = ""; 1729 } else { 1730 if (mDisplayedValues != null) { 1731 int displayedValueIndex = selectorIndex - mMinValue; 1732 scrollSelectorValue = mDisplayedValues[displayedValueIndex]; 1733 } else { 1734 scrollSelectorValue = formatNumber(selectorIndex); 1735 } 1736 } 1737 cache.put(selectorIndex, scrollSelectorValue); 1738 } 1739 1740 private String formatNumber(int value) { 1741 return (mFormatter != null) ? mFormatter.format(value) : String.valueOf(value); 1742 } 1743 1744 private void validateInputTextView(View v) { 1745 String str = String.valueOf(((TextView) v).getText()); 1746 if (TextUtils.isEmpty(str)) { 1747 // Restore to the old value as we don't allow empty values 1748 updateInputTextView(); 1749 } else { 1750 // Check the new value and ensure it's in range 1751 int current = getSelectedPos(str.toString()); 1752 changeCurrent(current); 1753 } 1754 } 1755 1756 /** 1757 * Updates the view of this NumberPicker. If displayValues were specified in 1758 * the string corresponding to the index specified by the current value will 1759 * be returned. Otherwise, the formatter specified in {@link #setFormatter} 1760 * will be used to format the number. 1761 */ 1762 private void updateInputTextView() { 1763 /* 1764 * If we don't have displayed values then use the current number else 1765 * find the correct value in the displayed values for the current 1766 * number. 1767 */ 1768 if (mDisplayedValues == null) { 1769 mInputText.setText(formatNumber(mValue)); 1770 } else { 1771 mInputText.setText(mDisplayedValues[mValue - mMinValue]); 1772 } 1773 mInputText.setSelection(mInputText.getText().length()); 1774 1775 if (mFlingable && AccessibilityManager.getInstance(mContext).isEnabled()) { 1776 String text = mContext.getString(R.string.number_picker_increment_scroll_mode, 1777 mInputText.getText()); 1778 mInputText.setContentDescription(text); 1779 } 1780 } 1781 1782 /** 1783 * Notifies the listener, if registered, of a change of the value of this 1784 * NumberPicker. 1785 */ 1786 private void notifyChange(int previous, int current) { 1787 if (mOnValueChangeListener != null) { 1788 mOnValueChangeListener.onValueChange(this, previous, mValue); 1789 } 1790 } 1791 1792 /** 1793 * Posts a command for changing the current value by one. 1794 * 1795 * @param increment Whether to increment or decrement the value. 1796 */ 1797 private void postChangeCurrentByOneFromLongPress(boolean increment) { 1798 mInputText.clearFocus(); 1799 removeAllCallbacks(); 1800 if (mChangeCurrentByOneFromLongPressCommand == null) { 1801 mChangeCurrentByOneFromLongPressCommand = new ChangeCurrentByOneFromLongPressCommand(); 1802 } 1803 mChangeCurrentByOneFromLongPressCommand.setIncrement(increment); 1804 post(mChangeCurrentByOneFromLongPressCommand); 1805 } 1806 1807 /** 1808 * Removes all pending callback from the message queue. 1809 */ 1810 private void removeAllCallbacks() { 1811 if (mChangeCurrentByOneFromLongPressCommand != null) { 1812 removeCallbacks(mChangeCurrentByOneFromLongPressCommand); 1813 } 1814 if (mAdjustScrollerCommand != null) { 1815 removeCallbacks(mAdjustScrollerCommand); 1816 } 1817 if (mSetSelectionCommand != null) { 1818 removeCallbacks(mSetSelectionCommand); 1819 } 1820 } 1821 1822 /** 1823 * @return The selected index given its displayed <code>value</code>. 1824 */ 1825 private int getSelectedPos(String value) { 1826 if (mDisplayedValues == null) { 1827 try { 1828 return Integer.parseInt(value); 1829 } catch (NumberFormatException e) { 1830 // Ignore as if it's not a number we don't care 1831 } 1832 } else { 1833 for (int i = 0; i < mDisplayedValues.length; i++) { 1834 // Don't force the user to type in jan when ja will do 1835 value = value.toLowerCase(); 1836 if (mDisplayedValues[i].toLowerCase().startsWith(value)) { 1837 return mMinValue + i; 1838 } 1839 } 1840 1841 /* 1842 * The user might have typed in a number into the month field i.e. 1843 * 10 instead of OCT so support that too. 1844 */ 1845 try { 1846 return Integer.parseInt(value); 1847 } catch (NumberFormatException e) { 1848 1849 // Ignore as if it's not a number we don't care 1850 } 1851 } 1852 return mMinValue; 1853 } 1854 1855 /** 1856 * Posts an {@link SetSelectionCommand} from the given <code>selectionStart 1857 * </code> to 1858 * <code>selectionEnd</code>. 1859 */ 1860 private void postSetSelectionCommand(int selectionStart, int selectionEnd) { 1861 if (mSetSelectionCommand == null) { 1862 mSetSelectionCommand = new SetSelectionCommand(); 1863 } else { 1864 removeCallbacks(mSetSelectionCommand); 1865 } 1866 mSetSelectionCommand.mSelectionStart = selectionStart; 1867 mSetSelectionCommand.mSelectionEnd = selectionEnd; 1868 post(mSetSelectionCommand); 1869 } 1870 1871 /** 1872 * Posts an {@link AdjustScrollerCommand} within the given <code> 1873 * delayMillis</code> 1874 * . 1875 */ 1876 private void postAdjustScrollerCommand(int delayMillis) { 1877 if (mAdjustScrollerCommand == null) { 1878 mAdjustScrollerCommand = new AdjustScrollerCommand(); 1879 } else { 1880 removeCallbacks(mAdjustScrollerCommand); 1881 } 1882 postDelayed(mAdjustScrollerCommand, delayMillis); 1883 } 1884 1885 /** 1886 * Filter for accepting only valid indices or prefixes of the string 1887 * representation of valid indices. 1888 */ 1889 class InputTextFilter extends NumberKeyListener { 1890 1891 // XXX This doesn't allow for range limits when controlled by a 1892 // soft input method! 1893 public int getInputType() { 1894 return InputType.TYPE_CLASS_TEXT; 1895 } 1896 1897 @Override 1898 protected char[] getAcceptedChars() { 1899 return DIGIT_CHARACTERS; 1900 } 1901 1902 @Override 1903 public CharSequence filter(CharSequence source, int start, int end, Spanned dest, 1904 int dstart, int dend) { 1905 if (mDisplayedValues == null) { 1906 CharSequence filtered = super.filter(source, start, end, dest, dstart, dend); 1907 if (filtered == null) { 1908 filtered = source.subSequence(start, end); 1909 } 1910 1911 String result = String.valueOf(dest.subSequence(0, dstart)) + filtered 1912 + dest.subSequence(dend, dest.length()); 1913 1914 if ("".equals(result)) { 1915 return result; 1916 } 1917 int val = getSelectedPos(result); 1918 1919 /* 1920 * Ensure the user can't type in a value greater than the max 1921 * allowed. We have to allow less than min as the user might 1922 * want to delete some numbers and then type a new number. 1923 */ 1924 if (val > mMaxValue) { 1925 return ""; 1926 } else { 1927 return filtered; 1928 } 1929 } else { 1930 CharSequence filtered = String.valueOf(source.subSequence(start, end)); 1931 if (TextUtils.isEmpty(filtered)) { 1932 return ""; 1933 } 1934 String result = String.valueOf(dest.subSequence(0, dstart)) + filtered 1935 + dest.subSequence(dend, dest.length()); 1936 String str = String.valueOf(result).toLowerCase(); 1937 for (String val : mDisplayedValues) { 1938 String valLowerCase = val.toLowerCase(); 1939 if (valLowerCase.startsWith(str)) { 1940 postSetSelectionCommand(result.length(), val.length()); 1941 return val.subSequence(dstart, val.length()); 1942 } 1943 } 1944 return ""; 1945 } 1946 } 1947 } 1948 1949 /** 1950 * Command for setting the input text selection. 1951 */ 1952 class SetSelectionCommand implements Runnable { 1953 private int mSelectionStart; 1954 1955 private int mSelectionEnd; 1956 1957 public void run() { 1958 mInputText.setSelection(mSelectionStart, mSelectionEnd); 1959 } 1960 } 1961 1962 /** 1963 * Command for adjusting the scroller to show in its center the closest of 1964 * the displayed items. 1965 */ 1966 class AdjustScrollerCommand implements Runnable { 1967 public void run() { 1968 mPreviousScrollerY = 0; 1969 if (mInitialScrollOffset == mCurrentScrollOffset) { 1970 updateInputTextView(); 1971 showInputControls(mShowInputControlsAnimimationDuration); 1972 return; 1973 } 1974 // adjust to the closest value 1975 int deltaY = mInitialScrollOffset - mCurrentScrollOffset; 1976 if (Math.abs(deltaY) > mSelectorElementHeight / 2) { 1977 deltaY += (deltaY > 0) ? -mSelectorElementHeight : mSelectorElementHeight; 1978 } 1979 mAdjustScroller.startScroll(0, 0, 0, deltaY, SELECTOR_ADJUSTMENT_DURATION_MILLIS); 1980 invalidate(); 1981 } 1982 } 1983 1984 /** 1985 * Command for changing the current value from a long press by one. 1986 */ 1987 class ChangeCurrentByOneFromLongPressCommand implements Runnable { 1988 private boolean mIncrement; 1989 1990 private void setIncrement(boolean increment) { 1991 mIncrement = increment; 1992 } 1993 1994 public void run() { 1995 changeCurrentByOne(mIncrement); 1996 postDelayed(this, mLongPressUpdateInterval); 1997 } 1998 } 1999} 2000