Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 1 | /* |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 2 | * Copyright (C) 2015 The Android Open Source Project |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.calculator2; |
| 18 | |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 19 | import android.content.ClipData; |
| 20 | import android.content.ClipDescription; |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 21 | import android.content.ClipboardManager; |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 22 | import android.content.Context; |
Hans Boehm | 7f83e36 | 2015-06-10 15:41:04 -0700 | [diff] [blame] | 23 | import android.graphics.Rect; |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 24 | import android.text.Layout; |
Hans Boehm | 7f83e36 | 2015-06-10 15:41:04 -0700 | [diff] [blame] | 25 | import android.text.Spannable; |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 26 | import android.text.SpannableString; |
Hans Boehm | 1176f23 | 2015-05-11 16:26:03 -0700 | [diff] [blame] | 27 | import android.text.Spanned; |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 28 | import android.text.TextPaint; |
Hans Boehm | 7f83e36 | 2015-06-10 15:41:04 -0700 | [diff] [blame] | 29 | import android.text.style.BackgroundColorSpan; |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 30 | import android.text.style.ForegroundColorSpan; |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 31 | import android.util.AttributeSet; |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 32 | import android.view.ActionMode; |
| 33 | import android.view.GestureDetector; |
| 34 | import android.view.Menu; |
| 35 | import android.view.MenuInflater; |
| 36 | import android.view.MenuItem; |
| 37 | import android.view.MotionEvent; |
| 38 | import android.view.View; |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 39 | import android.widget.OverScroller; |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 40 | import android.widget.Toast; |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 41 | |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 42 | // A text widget that is "infinitely" scrollable to the right, |
| 43 | // and obtains the text to display via a callback to Logic. |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 44 | public class CalculatorResult extends AlignedTextView { |
Hans Boehm | 61568a1 | 2015-05-18 18:25:41 -0700 | [diff] [blame] | 45 | static final int MAX_RIGHT_SCROLL = 10000000; |
Hans Boehm | 08e8f32 | 2015-04-21 13:18:38 -0700 | [diff] [blame] | 46 | static final int INVALID = MAX_RIGHT_SCROLL + 10000; |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 47 | // A larger value is unlikely to avoid running out of space |
| 48 | final OverScroller mScroller; |
| 49 | final GestureDetector mGestureDetector; |
| 50 | class MyTouchListener implements View.OnTouchListener { |
| 51 | @Override |
| 52 | public boolean onTouch(View v, MotionEvent event) { |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 53 | return mGestureDetector.onTouchEvent(event); |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 54 | } |
| 55 | } |
| 56 | final MyTouchListener mTouchListener = new MyTouchListener(); |
| 57 | private Evaluator mEvaluator; |
| 58 | private boolean mScrollable = false; |
| 59 | // A scrollable result is currently displayed. |
Hans Boehm | 760a9dc | 2015-04-20 10:27:12 -0700 | [diff] [blame] | 60 | private boolean mValid = false; |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 61 | // The result holds something valid; either a a number or an error |
| 62 | // message. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 63 | // A suffix of "Pos" denotes a pixel offset. Zero represents a scroll position |
| 64 | // in which the decimal point is just barely visible on the right of the display. |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 65 | private int mCurrentPos;// Position of right of display relative to decimal point, in pixels. |
| 66 | // Large positive values mean the decimal point is scrolled off the |
| 67 | // left of the display. Zero means decimal point is barely displayed |
| 68 | // on the right. |
Hans Boehm | 61568a1 | 2015-05-18 18:25:41 -0700 | [diff] [blame] | 69 | private int mLastPos; // Position already reflected in display. Pixels. |
| 70 | private int mMinPos; // Minimum position before all digits disappear off the right. Pixels. |
| 71 | private int mMaxPos; // Maximum position before we start displaying the infinite |
| 72 | // sequence of trailing zeroes on the right. Pixels. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 73 | // In the following, we use a suffix of Offset to denote a character position in a numeric |
| 74 | // string relative to the decimal point. Positive is to the right and negative is to |
| 75 | // the left. 1 = tenths position, -1 = units. Integer.MAX_VALUE is sometimes used |
| 76 | // for the offset of the last digit in an a nonterminating decimal expansion. |
| 77 | // We use the suffix "Index" to denote a zero-based index into a string representing a |
| 78 | // result. |
| 79 | // TODO: Apply the same convention to other classes. |
| 80 | private int mMaxCharOffset; // Character offset from decimal point of rightmost digit |
| 81 | // that should be displayed. Essentially the same as |
| 82 | private int mLsdOffset; // Position of least-significant digit in result |
| 83 | private int mLastDisplayedOffset; // Offset of last digit actually displayed after adding |
Hans Boehm | f6dae11 | 2015-06-18 17:57:50 -0700 | [diff] [blame] | 84 | // exponent. |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 85 | private final Object mWidthLock = new Object(); |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 86 | // Protects the next two fields. |
| 87 | private int mWidthConstraint = -1; |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 88 | // Our total width in pixels minus space for ellipsis. |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 89 | private float mCharWidth = 1; |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 90 | // Maximum character width. For now we pretend that all characters |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 91 | // have this width. |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 92 | // TODO: We're not really using a fixed width font. But it appears |
| 93 | // to be close enough for the characters we use that the difference |
| 94 | // is not noticeable. |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 95 | private static final int MAX_WIDTH = 100; |
| 96 | // Maximum number of digits displayed |
Hans Boehm | 50ed320 | 2015-06-09 14:35:49 -0700 | [diff] [blame] | 97 | public static final int MAX_LEADING_ZEROES = 6; |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 98 | // Maximum number of leading zeroes after decimal point before we |
| 99 | // switch to scientific notation with negative exponent. |
Hans Boehm | 50ed320 | 2015-06-09 14:35:49 -0700 | [diff] [blame] | 100 | public static final int MAX_TRAILING_ZEROES = 6; |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 101 | // Maximum number of trailing zeroes before the decimal point before |
| 102 | // we switch to scientific notation with positive exponent. |
| 103 | private static final int SCI_NOTATION_EXTRA = 1; |
| 104 | // Extra digits for standard scientific notation. In this case we |
| 105 | // have a deecimal point and no ellipsis. |
Hans Boehm | 1176f23 | 2015-05-11 16:26:03 -0700 | [diff] [blame] | 106 | private ActionMode mActionMode; |
| 107 | private final ForegroundColorSpan mExponentColorSpan; |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 108 | |
| 109 | public CalculatorResult(Context context, AttributeSet attrs) { |
| 110 | super(context, attrs); |
| 111 | mScroller = new OverScroller(context); |
| 112 | mGestureDetector = new GestureDetector(context, |
| 113 | new GestureDetector.SimpleOnGestureListener() { |
| 114 | @Override |
Justin Klaassen | d48b756 | 2015-04-16 16:51:38 -0700 | [diff] [blame] | 115 | public boolean onDown(MotionEvent e) { |
| 116 | return true; |
| 117 | } |
| 118 | @Override |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 119 | public boolean onFling(MotionEvent e1, MotionEvent e2, |
| 120 | float velocityX, float velocityY) { |
| 121 | if (!mScroller.isFinished()) { |
| 122 | mCurrentPos = mScroller.getFinalX(); |
| 123 | } |
| 124 | mScroller.forceFinished(true); |
Hans Boehm | 1176f23 | 2015-05-11 16:26:03 -0700 | [diff] [blame] | 125 | stopActionMode(); |
Hans Boehm | fbcef70 | 2015-04-27 18:07:47 -0700 | [diff] [blame] | 126 | CalculatorResult.this.cancelLongPress(); |
| 127 | // Ignore scrolls of error string, etc. |
| 128 | if (!mScrollable) return true; |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 129 | mScroller.fling(mCurrentPos, 0, - (int) velocityX, 0 /* horizontal only */, |
Hans Boehm | 61568a1 | 2015-05-18 18:25:41 -0700 | [diff] [blame] | 130 | mMinPos, mMaxPos, 0, 0); |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 131 | postInvalidateOnAnimation(); |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 132 | return true; |
| 133 | } |
| 134 | @Override |
| 135 | public boolean onScroll(MotionEvent e1, MotionEvent e2, |
| 136 | float distanceX, float distanceY) { |
Hans Boehm | 61568a1 | 2015-05-18 18:25:41 -0700 | [diff] [blame] | 137 | int distance = (int)distanceX; |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 138 | if (!mScroller.isFinished()) { |
| 139 | mCurrentPos = mScroller.getFinalX(); |
| 140 | } |
| 141 | mScroller.forceFinished(true); |
Hans Boehm | 1176f23 | 2015-05-11 16:26:03 -0700 | [diff] [blame] | 142 | stopActionMode(); |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 143 | CalculatorResult.this.cancelLongPress(); |
| 144 | if (!mScrollable) return true; |
Hans Boehm | 61568a1 | 2015-05-18 18:25:41 -0700 | [diff] [blame] | 145 | if (mCurrentPos + distance < mMinPos) { |
| 146 | distance = mMinPos - mCurrentPos; |
| 147 | } else if (mCurrentPos + distance > mMaxPos) { |
| 148 | distance = mMaxPos - mCurrentPos; |
| 149 | } |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 150 | int duration = (int)(e2.getEventTime() - e1.getEventTime()); |
| 151 | if (duration < 1 || duration > 100) duration = 10; |
Hans Boehm | 61568a1 | 2015-05-18 18:25:41 -0700 | [diff] [blame] | 152 | mScroller.startScroll(mCurrentPos, 0, distance, 0, (int)duration); |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 153 | postInvalidateOnAnimation(); |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 154 | return true; |
| 155 | } |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 156 | @Override |
| 157 | public void onLongPress(MotionEvent e) { |
Hans Boehm | 1176f23 | 2015-05-11 16:26:03 -0700 | [diff] [blame] | 158 | if (mValid) { |
| 159 | mActionMode = startActionMode(mCopyActionModeCallback, |
| 160 | ActionMode.TYPE_FLOATING); |
| 161 | } |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 162 | } |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 163 | }); |
| 164 | setOnTouchListener(mTouchListener); |
| 165 | setHorizontallyScrolling(false); // do it ourselves |
| 166 | setCursorVisible(false); |
Hans Boehm | 1176f23 | 2015-05-11 16:26:03 -0700 | [diff] [blame] | 167 | mExponentColorSpan = new ForegroundColorSpan( |
| 168 | context.getColor(R.color.display_result_exponent_text_color)); |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 169 | |
| 170 | // Copy ActionMode is triggered explicitly, not through |
| 171 | // setCustomSelectionActionModeCallback. |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | void setEvaluator(Evaluator evaluator) { |
| 175 | mEvaluator = evaluator; |
| 176 | } |
| 177 | |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 178 | @Override |
| 179 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 180 | super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| 181 | |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 182 | final TextPaint paint = getPaint(); |
| 183 | final int newWidthConstraint = MeasureSpec.getSize(widthMeasureSpec) |
| 184 | - (getPaddingLeft() + getPaddingRight()) |
| 185 | - (int) Math.ceil(Layout.getDesiredWidth(KeyMaps.ELLIPSIS, paint)); |
| 186 | final float newCharWidth = Layout.getDesiredWidth("\u2007", paint); |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 187 | synchronized(mWidthLock) { |
Hans Boehm | 013969e | 2015-04-13 20:29:47 -0700 | [diff] [blame] | 188 | mWidthConstraint = newWidthConstraint; |
| 189 | mCharWidth = newCharWidth; |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 190 | } |
| 191 | } |
| 192 | |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 193 | // Return the length of the exponent representation for the given exponent, in |
| 194 | // characters. |
| 195 | private final int expLen(int exp) { |
| 196 | if (exp == 0) return 0; |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 197 | final int abs_exp_digits = (int) Math.ceil(Math.log10(Math.abs((double)exp)) |
| 198 | + 0.0000000001d /* Round whole numbers to next integer */); |
| 199 | return abs_exp_digits + (exp >= 0 ? 1 : 2); |
Hans Boehm | 61568a1 | 2015-05-18 18:25:41 -0700 | [diff] [blame] | 200 | } |
| 201 | |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 202 | /** |
| 203 | * Initiate display of a new result. |
| 204 | * The parameters specify various properties of the result. |
| 205 | * @param initPrec Initial display precision computed by evaluator. (1 = tenths digit) |
| 206 | * @param msd Position of most significant digit. Offset from left of string. |
| 207 | Evaluator.INVALID_MSD if unknown. |
| 208 | * @param leastDigPos Position of least significant digit (1 = tenths digit) |
| 209 | * or Integer.MAX_VALUE. |
| 210 | * @param truncatedWholePart Result up to but not including decimal point. |
| 211 | Currently we only use the length. |
| 212 | */ |
| 213 | void displayResult(int initPrec, int msd, int leastDigPos, String truncatedWholePart) { |
| 214 | initPositions(initPrec, msd, leastDigPos, truncatedWholePart); |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 215 | redisplay(); |
| 216 | } |
| 217 | |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 218 | /** |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 219 | * Set up scroll bounds (mMinPos, mMaxPos, etc.) and determine whether the result is |
| 220 | * scrollable, based on the supplied information about the result. |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 221 | * This is unfortunately complicated because we need to predict whether trailing digits |
| 222 | * will eventually be replaced by an exponent. |
| 223 | * Just appending the exponent during formatting would be simpler, but would produce |
| 224 | * jumpier results during transitions. |
| 225 | */ |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 226 | private void initPositions(int initPrecOffset, int msdIndex, int lsdOffset, |
| 227 | String truncatedWholePart) { |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 228 | float charWidth; |
| 229 | int maxChars = getMaxChars(); |
| 230 | mLastPos = INVALID; |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 231 | mLsdOffset = lsdOffset; |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 232 | synchronized(mWidthLock) { |
| 233 | charWidth = mCharWidth; |
| 234 | } |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 235 | mCurrentPos = mMinPos = (int) Math.round(initPrecOffset * charWidth); |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 236 | // Prevent scrolling past initial position, which is calculated to show leading digits. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 237 | if (msdIndex == Evaluator.INVALID_MSD) { |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 238 | // Possible zero value |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 239 | if (lsdOffset == Integer.MIN_VALUE) { |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 240 | // Definite zero value. |
| 241 | mMaxPos = mMinPos; |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 242 | mMaxCharOffset = (int) Math.round(mMaxPos/charWidth); |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 243 | mScrollable = false; |
| 244 | } else { |
| 245 | // May be very small nonzero value. Allow user to find out. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 246 | mMaxPos = mMaxCharOffset = MAX_RIGHT_SCROLL; |
| 247 | mMinPos -= charWidth; // Allow for future minus sign. |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 248 | mScrollable = true; |
| 249 | } |
| 250 | return; |
| 251 | } |
| 252 | int wholeLen = truncatedWholePart.length(); |
| 253 | int negative = truncatedWholePart.charAt(0) == '-' ? 1 : 0; |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 254 | if (msdIndex > wholeLen && msdIndex <= wholeLen + 3) { |
| 255 | // Avoid tiny negative exponent; pretend msdIndex is just to the right of decimal point. |
| 256 | msdIndex = wholeLen - 1; |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 257 | } |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 258 | int minCharOffset = msdIndex - wholeLen; |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 259 | // Position of leftmost significant digit relative to dec. point. |
| 260 | // Usually negative. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 261 | mMaxCharOffset = MAX_RIGHT_SCROLL; // How far does it make sense to scroll right? |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 262 | // If msd is left of decimal point should logically be |
| 263 | // mMinPos = - (int) Math.ceil(getPaint().measureText(truncatedWholePart)), but |
| 264 | // we eventually translate to a character position by dividing by mCharWidth. |
| 265 | // To avoid rounding issues, we use the analogous computation here. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 266 | if (minCharOffset > -1 && minCharOffset < MAX_LEADING_ZEROES + 2) { |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 267 | // Small number of leading zeroes, avoid scientific notation. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 268 | minCharOffset = -1; |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 269 | } |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 270 | if (lsdOffset < MAX_RIGHT_SCROLL) { |
| 271 | mMaxCharOffset = lsdOffset; |
| 272 | if (mMaxCharOffset < -1 && mMaxCharOffset > -(MAX_TRAILING_ZEROES + 2)) { |
| 273 | mMaxCharOffset = -1; |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 274 | } |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 275 | // lsdOffset is positive or negative, never 0. |
| 276 | int currentExpLen = 0; // Length of required standard scientific notation exponent. |
| 277 | if (mMaxCharOffset < -1) { |
| 278 | currentExpLen = expLen(-minCharOffset - 1); |
| 279 | } else if (minCharOffset > -1 || mMaxCharOffset >= maxChars) { |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 280 | // Number either entirely to the right of decimal point, or decimal point not |
| 281 | // visible when scrolled to the right. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 282 | currentExpLen = expLen(-minCharOffset); |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 283 | } |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 284 | mScrollable = (mMaxCharOffset + currentExpLen - minCharOffset + negative >= maxChars); |
| 285 | int newMaxCharOffset; |
| 286 | if (currentExpLen > 0) { |
| 287 | if (mScrollable) { |
| 288 | // We'll use exponent corresponding to leastDigPos when scrolled to right. |
| 289 | newMaxCharOffset = mMaxCharOffset + expLen(-lsdOffset); |
| 290 | } else { |
| 291 | newMaxCharOffset = mMaxCharOffset + currentExpLen; |
| 292 | } |
| 293 | if (mMaxCharOffset <= -1 && newMaxCharOffset > -1) { |
| 294 | // Very unlikely; just drop exponent. |
| 295 | mMaxCharOffset = -1; |
| 296 | } else { |
| 297 | mMaxCharOffset = newMaxCharOffset; |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 298 | } |
| 299 | } |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 300 | mMaxPos = Math.min((int) Math.round(mMaxCharOffset * charWidth), MAX_RIGHT_SCROLL); |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 301 | if (!mScrollable) { |
| 302 | // Position the number consistently with our assumptions to make sure it |
| 303 | // actually fits. |
| 304 | mCurrentPos = mMaxPos; |
| 305 | } |
| 306 | } else { |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 307 | mMaxPos = mMaxCharOffset = MAX_RIGHT_SCROLL; |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 308 | mScrollable = true; |
| 309 | } |
| 310 | } |
| 311 | |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 312 | void displayError(int resourceId) { |
Hans Boehm | 760a9dc | 2015-04-20 10:27:12 -0700 | [diff] [blame] | 313 | mValid = true; |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 314 | mScrollable = false; |
| 315 | setText(resourceId); |
| 316 | } |
| 317 | |
Hans Boehm | 013969e | 2015-04-13 20:29:47 -0700 | [diff] [blame] | 318 | private final int MAX_COPY_SIZE = 1000000; |
| 319 | |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 320 | /* |
| 321 | * Return the most significant digit position in the given string or Evaluator.INVALID_MSD. |
| 322 | * Unlike Evaluator.getMsdPos, we treat a final 1 as significant. |
| 323 | */ |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 324 | public static int getNaiveMsdIndex(String s) { |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 325 | int len = s.length(); |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 326 | for (int i = 0; i < len; ++i) { |
| 327 | char c = s.charAt(i); |
| 328 | if (c != '-' && c != '.' && c != '0') { |
| 329 | return i; |
| 330 | } |
| 331 | } |
| 332 | return Evaluator.INVALID_MSD; |
| 333 | } |
| 334 | |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 335 | // Format a result returned by Evaluator.getString() into a single line containing ellipses |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 336 | // (if appropriate) and an exponent (if appropriate). prec is the value that was passed to |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 337 | // getString and thus identifies the significance of the rightmost digit. |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 338 | // A value of 1 means the rightmost digits corresponds to tenths. |
| 339 | // maxDigs is the maximum number of characters in the result. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 340 | // We set lastDisplayedOffset[0] to the offset of the last digit actually appearing in |
Hans Boehm | f6dae11 | 2015-06-18 17:57:50 -0700 | [diff] [blame] | 341 | // the display. |
| 342 | // If forcePrecision is true, we make sure that the last displayed digit corresponds to |
| 343 | // prec, and allow maxDigs to be exceeded in assing the exponent. |
Hans Boehm | 08e8f32 | 2015-04-21 13:18:38 -0700 | [diff] [blame] | 344 | // We add two distinct kinds of exponents: |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 345 | // (1) If the final result contains the leading digit we use standard scientific notation. |
| 346 | // (2) If not, we add an exponent corresponding to an interpretation of the final result as |
| 347 | // an integer. |
Hans Boehm | 08e8f32 | 2015-04-21 13:18:38 -0700 | [diff] [blame] | 348 | // We add an ellipsis on the left if the result was truncated. |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 349 | // We add ellipses and exponents in a way that leaves most digits in the position they |
| 350 | // would have been in had we not done so. |
| 351 | // This minimizes jumps as a result of scrolling. Result is NOT internationalized, |
| 352 | // uses "e" for exponent. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 353 | public String formatResult(String in, int precOffset, int maxDigs, boolean truncated, |
| 354 | boolean negative, int lastDisplayedOffset[], boolean forcePrecision) { |
| 355 | final int minusSpace = negative ? 1 : 0; |
| 356 | final int msdIndex = truncated ? -1 : getNaiveMsdIndex(in); // INVALID_MSD is OK. |
| 357 | final int decIndex = in.indexOf('.'); |
| 358 | String result = in; |
| 359 | lastDisplayedOffset[0] = precOffset; |
| 360 | if ((decIndex == -1 || msdIndex != Evaluator.INVALID_MSD |
| 361 | && msdIndex - decIndex > MAX_LEADING_ZEROES + 1) && precOffset != -1) { |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 362 | // No decimal point displayed, and it's not just to the right of the last digit, |
| 363 | // or we should suppress leading zeroes. |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 364 | // Add an exponent to let the user track which digits are currently displayed. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 365 | // Start with type (2) exponent if we dropped no digits. -1 accounts for decimal point. |
| 366 | final int initExponent = precOffset > 0 ? -precOffset : -precOffset - 1; |
| 367 | int exponent = initExponent; |
Hans Boehm | 08e8f32 | 2015-04-21 13:18:38 -0700 | [diff] [blame] | 368 | boolean hasPoint = false; |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 369 | if (!truncated && msdIndex < maxDigs - 1 |
| 370 | && result.length() - msdIndex + 1 + minusSpace |
| 371 | <= maxDigs + SCI_NOTATION_EXTRA) { |
| 372 | // Type (1) exponent computation and transformation: |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 373 | // Leading digit is in display window. Use standard calculator scientific notation |
| 374 | // with one digit to the left of the decimal point. Insert decimal point and |
| 375 | // delete leading zeroes. |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 376 | // We try to keep leading digits roughly in position, and never |
Hans Boehm | f6dae11 | 2015-06-18 17:57:50 -0700 | [diff] [blame] | 377 | // lengthen the result by more than SCI_NOTATION_EXTRA. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 378 | final int resLen = result.length(); |
| 379 | String fraction = result.substring(msdIndex + 1, resLen); |
| 380 | result = (negative ? "-" : "") + result.substring(msdIndex, msdIndex + 1) |
| 381 | + "." + fraction; |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 382 | // Original exp was correct for decimal point at right of fraction. |
| 383 | // Adjust by length of fraction. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 384 | exponent = initExponent + resLen - msdIndex - 1; |
Hans Boehm | 08e8f32 | 2015-04-21 13:18:38 -0700 | [diff] [blame] | 385 | hasPoint = true; |
| 386 | } |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 387 | if (exponent != 0 || truncated) { |
Hans Boehm | 08e8f32 | 2015-04-21 13:18:38 -0700 | [diff] [blame] | 388 | // Actually add the exponent of either type: |
Hans Boehm | f6dae11 | 2015-06-18 17:57:50 -0700 | [diff] [blame] | 389 | if (!forcePrecision) { |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 390 | int dropDigits; // Digits to drop to make room for exponent. |
| 391 | if (hasPoint) { |
| 392 | // Type (1) exponent. |
Hans Boehm | f6dae11 | 2015-06-18 17:57:50 -0700 | [diff] [blame] | 393 | // Drop digits even if there is room. Otherwise the scrolling gets jumpy. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 394 | dropDigits = expLen(exponent); |
| 395 | if (dropDigits >= result.length() - 1) { |
| 396 | // Jumpy is better than no mantissa. Probably impossible anyway. |
| 397 | dropDigits = Math.max(result.length() - 2, 0); |
Hans Boehm | f6dae11 | 2015-06-18 17:57:50 -0700 | [diff] [blame] | 398 | } |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 399 | } else { |
| 400 | // Type (2) exponent. |
| 401 | // Exponent depends on the number of digits we drop, which depends on |
| 402 | // exponent ... |
| 403 | for (dropDigits = 2; expLen(initExponent + dropDigits) > dropDigits; |
| 404 | ++dropDigits) {} |
| 405 | exponent = initExponent + dropDigits; |
| 406 | if (precOffset - dropDigits > mLsdOffset) { |
Hans Boehm | f6dae11 | 2015-06-18 17:57:50 -0700 | [diff] [blame] | 407 | // This can happen if e.g. result = 10^40 + 10^10 |
| 408 | // It turns out we would otherwise display ...10e9 because it takes |
| 409 | // the same amount of space as ...1e10 but shows one more digit. |
| 410 | // But we don't want to display a trailing zero, even if it's free. |
| 411 | ++dropDigits; |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 412 | ++exponent; |
Hans Boehm | f6dae11 | 2015-06-18 17:57:50 -0700 | [diff] [blame] | 413 | } |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 414 | } |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 415 | result = result.substring(0, result.length() - dropDigits); |
| 416 | lastDisplayedOffset[0] -= dropDigits; |
Hans Boehm | 08e8f32 | 2015-04-21 13:18:38 -0700 | [diff] [blame] | 417 | } |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 418 | result = result + "e" + Integer.toString(exponent); |
Hans Boehm | 08e8f32 | 2015-04-21 13:18:38 -0700 | [diff] [blame] | 419 | } // else don't add zero exponent |
| 420 | } |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 421 | if (truncated || negative && result.charAt(0) != '-') { |
| 422 | result = KeyMaps.ELLIPSIS + result.substring(1, result.length()); |
| 423 | } |
| 424 | return result; |
Hans Boehm | 08e8f32 | 2015-04-21 13:18:38 -0700 | [diff] [blame] | 425 | } |
| 426 | |
Hans Boehm | f6dae11 | 2015-06-18 17:57:50 -0700 | [diff] [blame] | 427 | /** |
| 428 | * Get formatted, but not internationalized, result from mEvaluator. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 429 | * @param precOffset requested position (1 = tenths) of last included digit. |
Hans Boehm | f6dae11 | 2015-06-18 17:57:50 -0700 | [diff] [blame] | 430 | * @param maxSize Maximum number of characters (more or less) in result. |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 431 | * @param lastDisplayedOffset Zeroth entry is set to actual offset of last included digit, |
| 432 | * after adjusting for exponent, etc. |
Hans Boehm | f6dae11 | 2015-06-18 17:57:50 -0700 | [diff] [blame] | 433 | * @param forcePrecision Ensure that last included digit is at pos, at the expense |
| 434 | * of treating maxSize as a soft limit. |
| 435 | */ |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 436 | private String getFormattedResult(int precOffset, int maxSize, int lastDisplayedOffset[], |
Hans Boehm | f6dae11 | 2015-06-18 17:57:50 -0700 | [diff] [blame] | 437 | boolean forcePrecision) { |
Hans Boehm | 08e8f32 | 2015-04-21 13:18:38 -0700 | [diff] [blame] | 438 | final boolean truncated[] = new boolean[1]; |
| 439 | final boolean negative[] = new boolean[1]; |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 440 | final int requestedPrecOffset[] = {precOffset}; |
| 441 | final String rawResult = mEvaluator.getString(requestedPrecOffset, mMaxCharOffset, |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 442 | maxSize, truncated, negative); |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 443 | return formatResult(rawResult, requestedPrecOffset[0], maxSize, truncated[0], negative[0], |
| 444 | lastDisplayedOffset, forcePrecision); |
Hans Boehm | 08e8f32 | 2015-04-21 13:18:38 -0700 | [diff] [blame] | 445 | } |
| 446 | |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 447 | // Return entire result (within reason) up to current displayed precision. |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 448 | public String getFullText() { |
Hans Boehm | 760a9dc | 2015-04-20 10:27:12 -0700 | [diff] [blame] | 449 | if (!mValid) return ""; |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 450 | if (!mScrollable) return getText().toString(); |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 451 | int currentCharOffset = getCurrentCharOffset(); |
Hans Boehm | f6dae11 | 2015-06-18 17:57:50 -0700 | [diff] [blame] | 452 | int unused[] = new int[1]; |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 453 | return KeyMaps.translateResult(getFormattedResult(mLastDisplayedOffset, MAX_COPY_SIZE, |
Hans Boehm | f6dae11 | 2015-06-18 17:57:50 -0700 | [diff] [blame] | 454 | unused, true)); |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 455 | } |
| 456 | |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 457 | public boolean fullTextIsExact() { |
Hans Boehm | f6dae11 | 2015-06-18 17:57:50 -0700 | [diff] [blame] | 458 | return !mScrollable |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 459 | || mMaxCharOffset == getCurrentCharOffset() && mMaxCharOffset != MAX_RIGHT_SCROLL; |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 460 | } |
| 461 | |
Hans Boehm | 61568a1 | 2015-05-18 18:25:41 -0700 | [diff] [blame] | 462 | /** |
| 463 | * Return the maximum number of characters that will fit in the result display. |
| 464 | * May be called asynchronously from non-UI thread. |
| 465 | */ |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 466 | int getMaxChars() { |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 467 | int result; |
| 468 | synchronized(mWidthLock) { |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 469 | result = (int) Math.floor(mWidthConstraint / mCharWidth); |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 470 | // We can apparently finish evaluating before onMeasure in CalculatorText has been |
| 471 | // called, in which case we get 0 or -1 as the width constraint. |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 472 | } |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 473 | if (result <= 0) { |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 474 | // Return something conservatively big, to force sufficient evaluation. |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 475 | return MAX_WIDTH; |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 476 | } else { |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 477 | // Always allow for the ellipsis character which already accounted for in the width |
| 478 | // constraint. |
| 479 | return result + 1; |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 480 | } |
| 481 | } |
| 482 | |
Hans Boehm | 61568a1 | 2015-05-18 18:25:41 -0700 | [diff] [blame] | 483 | /** |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 484 | * @return {@code true} if the currently displayed result is scrollable |
Hans Boehm | 61568a1 | 2015-05-18 18:25:41 -0700 | [diff] [blame] | 485 | */ |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 486 | public boolean isScrollable() { |
| 487 | return mScrollable; |
Hans Boehm | 61568a1 | 2015-05-18 18:25:41 -0700 | [diff] [blame] | 488 | } |
| 489 | |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 490 | int getCurrentCharOffset() { |
Hans Boehm | 013969e | 2015-04-13 20:29:47 -0700 | [diff] [blame] | 491 | synchronized(mWidthLock) { |
Hans Boehm | a0e45f3 | 2015-05-30 13:20:35 -0700 | [diff] [blame] | 492 | return (int) Math.round(mCurrentPos / mCharWidth); |
Hans Boehm | 013969e | 2015-04-13 20:29:47 -0700 | [diff] [blame] | 493 | } |
| 494 | } |
| 495 | |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 496 | void clear() { |
Hans Boehm | 760a9dc | 2015-04-20 10:27:12 -0700 | [diff] [blame] | 497 | mValid = false; |
Hans Boehm | 1176f23 | 2015-05-11 16:26:03 -0700 | [diff] [blame] | 498 | mScrollable = false; |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 499 | setText(""); |
| 500 | } |
| 501 | |
| 502 | void redisplay() { |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 503 | int currentCharOffset = getCurrentCharOffset(); |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 504 | int maxChars = getMaxChars(); |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 505 | int lastDisplayedOffset[] = new int[1]; |
| 506 | String result = getFormattedResult(currentCharOffset, maxChars, lastDisplayedOffset, false); |
| 507 | int expIndex = result.indexOf('e'); |
Hans Boehm | 013969e | 2015-04-13 20:29:47 -0700 | [diff] [blame] | 508 | result = KeyMaps.translateResult(result); |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 509 | if (expIndex > 0 && result.indexOf('.') == -1) { |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 510 | // Gray out exponent if used as position indicator |
| 511 | SpannableString formattedResult = new SpannableString(result); |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 512 | formattedResult.setSpan(mExponentColorSpan, expIndex, result.length(), |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 513 | Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); |
| 514 | setText(formattedResult); |
| 515 | } else { |
| 516 | setText(result); |
| 517 | } |
Hans Boehm | 5e802f3 | 2015-06-22 17:18:52 -0700 | [diff] [blame^] | 518 | mLastDisplayedOffset = lastDisplayedOffset[0]; |
Hans Boehm | 760a9dc | 2015-04-20 10:27:12 -0700 | [diff] [blame] | 519 | mValid = true; |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 520 | } |
| 521 | |
| 522 | @Override |
| 523 | public void computeScroll() { |
| 524 | if (!mScrollable) return; |
| 525 | if (mScroller.computeScrollOffset()) { |
| 526 | mCurrentPos = mScroller.getCurrX(); |
| 527 | if (mCurrentPos != mLastPos) { |
| 528 | mLastPos = mCurrentPos; |
| 529 | redisplay(); |
| 530 | } |
| 531 | if (!mScroller.isFinished()) { |
Justin Klaassen | 4459516 | 2015-05-28 17:55:20 -0700 | [diff] [blame] | 532 | postInvalidateOnAnimation(); |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 533 | } |
| 534 | } |
| 535 | } |
| 536 | |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 537 | // Copy support: |
| 538 | |
Hans Boehm | 7f83e36 | 2015-06-10 15:41:04 -0700 | [diff] [blame] | 539 | private ActionMode.Callback2 mCopyActionModeCallback = new ActionMode.Callback2() { |
| 540 | |
| 541 | private BackgroundColorSpan mHighlightSpan; |
| 542 | |
| 543 | private void highlightResult() { |
| 544 | final Spannable text = (Spannable) getText(); |
| 545 | mHighlightSpan = new BackgroundColorSpan(getHighlightColor()); |
| 546 | text.setSpan(mHighlightSpan, 0, text.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); |
| 547 | } |
| 548 | |
| 549 | private void unhighlightResult() { |
| 550 | final Spannable text = (Spannable) getText(); |
| 551 | text.removeSpan(mHighlightSpan); |
| 552 | } |
| 553 | |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 554 | @Override |
| 555 | public boolean onCreateActionMode(ActionMode mode, Menu menu) { |
| 556 | MenuInflater inflater = mode.getMenuInflater(); |
| 557 | inflater.inflate(R.menu.copy, menu); |
Hans Boehm | 7f83e36 | 2015-06-10 15:41:04 -0700 | [diff] [blame] | 558 | highlightResult(); |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 559 | return true; |
| 560 | } |
| 561 | |
| 562 | @Override |
| 563 | public boolean onPrepareActionMode(ActionMode mode, Menu menu) { |
| 564 | return false; // Return false if nothing is done |
| 565 | } |
| 566 | |
| 567 | @Override |
| 568 | public boolean onActionItemClicked(ActionMode mode, MenuItem item) { |
| 569 | switch (item.getItemId()) { |
| 570 | case R.id.menu_copy: |
| 571 | copyContent(); |
| 572 | mode.finish(); |
| 573 | return true; |
| 574 | default: |
| 575 | return false; |
| 576 | } |
| 577 | } |
| 578 | |
| 579 | @Override |
| 580 | public void onDestroyActionMode(ActionMode mode) { |
Hans Boehm | 7f83e36 | 2015-06-10 15:41:04 -0700 | [diff] [blame] | 581 | unhighlightResult(); |
Hans Boehm | 1176f23 | 2015-05-11 16:26:03 -0700 | [diff] [blame] | 582 | mActionMode = null; |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 583 | } |
Hans Boehm | 7f83e36 | 2015-06-10 15:41:04 -0700 | [diff] [blame] | 584 | |
| 585 | @Override |
| 586 | public void onGetContentRect(ActionMode mode, View view, Rect outRect) { |
| 587 | super.onGetContentRect(mode, view, outRect); |
| 588 | outRect.left += getPaddingLeft(); |
| 589 | outRect.top += getPaddingTop(); |
| 590 | outRect.right -= getPaddingRight(); |
| 591 | outRect.bottom -= getPaddingBottom(); |
| 592 | final int width = (int) Layout.getDesiredWidth(getText(), getPaint()); |
| 593 | if (width < outRect.width()) { |
| 594 | outRect.left = outRect.right - width; |
| 595 | } |
| 596 | } |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 597 | }; |
| 598 | |
Hans Boehm | 1176f23 | 2015-05-11 16:26:03 -0700 | [diff] [blame] | 599 | public boolean stopActionMode() { |
| 600 | if (mActionMode != null) { |
| 601 | mActionMode.finish(); |
| 602 | return true; |
| 603 | } |
| 604 | return false; |
| 605 | } |
| 606 | |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 607 | private void setPrimaryClip(ClipData clip) { |
| 608 | ClipboardManager clipboard = (ClipboardManager) getContext(). |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 609 | getSystemService(Context.CLIPBOARD_SERVICE); |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 610 | clipboard.setPrimaryClip(clip); |
| 611 | } |
| 612 | |
| 613 | private void copyContent() { |
| 614 | final CharSequence text = getFullText(); |
| 615 | ClipboardManager clipboard = |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 616 | (ClipboardManager) getContext().getSystemService(Context.CLIPBOARD_SERVICE); |
| 617 | // We include a tag URI, to allow us to recognize our own results and handle them |
| 618 | // specially. |
| 619 | ClipData.Item newItem = new ClipData.Item(text, null, mEvaluator.capture()); |
| 620 | String[] mimeTypes = new String[] {ClipDescription.MIMETYPE_TEXT_PLAIN}; |
| 621 | ClipData cd = new ClipData("calculator result", mimeTypes, newItem); |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 622 | clipboard.setPrimaryClip(cd); |
Hans Boehm | c01cd7f | 2015-05-12 18:32:19 -0700 | [diff] [blame] | 623 | Toast.makeText(getContext(), R.string.text_copied_toast, Toast.LENGTH_SHORT).show(); |
Hans Boehm | 4a6b7cb | 2015-04-03 18:41:52 -0700 | [diff] [blame] | 624 | } |
| 625 | |
Hans Boehm | 8461495 | 2014-11-25 18:46:17 -0800 | [diff] [blame] | 626 | } |