Justin Klaassen | 4b3af05 | 2014-05-27 17:53:10 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.calculator2; |
| 18 | |
| 19 | import android.animation.Animator; |
| 20 | import android.animation.AnimatorListenerAdapter; |
| 21 | import android.animation.AnimatorSet; |
| 22 | import android.animation.ArgbEvaluator; |
| 23 | import android.animation.ObjectAnimator; |
| 24 | import android.animation.ValueAnimator; |
| 25 | import android.animation.ValueAnimator.AnimatorUpdateListener; |
| 26 | import android.app.Activity; |
| 27 | import android.os.Bundle; |
Justin Klaassen | 3b4d13d | 2014-06-06 18:18:37 +0100 | [diff] [blame] | 28 | import android.support.v4.view.ViewPager; |
Justin Klaassen | 4b3af05 | 2014-05-27 17:53:10 -0700 | [diff] [blame] | 29 | import android.text.Editable; |
| 30 | import android.text.TextUtils; |
| 31 | import android.text.TextWatcher; |
| 32 | import android.view.KeyEvent; |
| 33 | import android.view.View; |
ztenghui | 3d6ecaf | 2014-06-05 09:56:00 -0700 | [diff] [blame] | 34 | import android.view.ViewAnimationUtils; |
Justin Klaassen | 4b3af05 | 2014-05-27 17:53:10 -0700 | [diff] [blame] | 35 | import android.view.View.OnLongClickListener; |
| 36 | import android.view.animation.AccelerateDecelerateInterpolator; |
| 37 | import android.widget.Button; |
Justin Klaassen | fed941a | 2014-06-09 18:42:40 +0100 | [diff] [blame] | 38 | import android.widget.TextView; |
| 39 | |
| 40 | import com.android.calculator2.CalculatorEditText.OnTextSizeChangeListener; |
| 41 | import com.android.calculator2.CalculatorExpressionEvaluator.EvaluateCallback; |
Justin Klaassen | 4b3af05 | 2014-05-27 17:53:10 -0700 | [diff] [blame] | 42 | |
| 43 | public class CalculatorActivity extends Activity |
Justin Klaassen | fed941a | 2014-06-09 18:42:40 +0100 | [diff] [blame] | 44 | implements OnTextSizeChangeListener, EvaluateCallback, OnLongClickListener { |
Justin Klaassen | 4b3af05 | 2014-05-27 17:53:10 -0700 | [diff] [blame] | 45 | |
| 46 | public static final String CALCULATOR_ACTIVITY_CURRENT_STATE = |
| 47 | CalculatorActivity.class.getSimpleName() + "_currentState"; |
| 48 | |
| 49 | private enum CalculatorState { |
| 50 | INPUT, EVALUATE, RESULT, ERROR |
| 51 | } |
| 52 | |
| 53 | private final TextWatcher mFormulaTextWatcher = new TextWatcher() { |
| 54 | @Override |
| 55 | public void beforeTextChanged(CharSequence charSequence, int start, int count, int after) { |
| 56 | } |
| 57 | |
| 58 | @Override |
| 59 | public void onTextChanged(CharSequence charSequence, int start, int count, int after) { |
| 60 | } |
| 61 | |
| 62 | @Override |
| 63 | public void afterTextChanged(Editable editable) { |
| 64 | setState(CalculatorState.INPUT); |
| 65 | mEvaluator.evaluate(editable, CalculatorActivity.this); |
| 66 | } |
| 67 | }; |
| 68 | |
Justin Klaassen | 741471e | 2014-06-11 09:43:44 -0700 | [diff] [blame^] | 69 | private final Editable.Factory mFormulaEditableFactory = new Editable.Factory() { |
| 70 | @Override |
| 71 | public Editable newEditable(CharSequence source) { |
| 72 | return new CalculatorExpressionBuilder(CalculatorActivity.this, source, |
| 73 | mCurrentState == CalculatorState.INPUT); |
| 74 | } |
| 75 | }; |
| 76 | |
Justin Klaassen | 4b3af05 | 2014-05-27 17:53:10 -0700 | [diff] [blame] | 77 | private CalculatorState mCurrentState; |
| 78 | private CalculatorExpressionEvaluator mEvaluator; |
| 79 | |
| 80 | private CalculatorEditText mFormulaEditText; |
| 81 | private CalculatorEditText mResultEditText; |
| 82 | |
Justin Klaassen | 3b4d13d | 2014-06-06 18:18:37 +0100 | [diff] [blame] | 83 | private ViewPager mPadViewPager; |
| 84 | |
Justin Klaassen | 4b3af05 | 2014-05-27 17:53:10 -0700 | [diff] [blame] | 85 | private View mRevealView; |
| 86 | private View mDeleteButton; |
| 87 | private View mClearButton; |
| 88 | |
| 89 | private Animator mCurrentAnimator; |
| 90 | |
| 91 | @Override |
| 92 | protected void onCreate(Bundle savedInstanceState) { |
| 93 | super.onCreate(savedInstanceState); |
| 94 | setContentView(R.layout.activity_calculator); |
| 95 | |
Justin Klaassen | 741471e | 2014-06-11 09:43:44 -0700 | [diff] [blame^] | 96 | if (savedInstanceState == null) { |
| 97 | savedInstanceState = Bundle.EMPTY; |
| 98 | } |
Justin Klaassen | 4b3af05 | 2014-05-27 17:53:10 -0700 | [diff] [blame] | 99 | |
| 100 | mFormulaEditText = (CalculatorEditText) findViewById(R.id.formula); |
| 101 | mResultEditText = (CalculatorEditText) findViewById(R.id.result); |
| 102 | |
Justin Klaassen | 3b4d13d | 2014-06-06 18:18:37 +0100 | [diff] [blame] | 103 | mPadViewPager = (ViewPager) findViewById(R.id.pad_pager); |
| 104 | |
Justin Klaassen | 4b3af05 | 2014-05-27 17:53:10 -0700 | [diff] [blame] | 105 | mRevealView = findViewById(R.id.reveal); |
| 106 | mDeleteButton = findViewById(R.id.del); |
| 107 | mClearButton = findViewById(R.id.clr); |
| 108 | |
Justin Klaassen | 741471e | 2014-06-11 09:43:44 -0700 | [diff] [blame^] | 109 | setState(CalculatorState.values()[savedInstanceState.getInt( |
| 110 | CALCULATOR_ACTIVITY_CURRENT_STATE, CalculatorState.INPUT.ordinal())]); |
| 111 | mEvaluator = new CalculatorExpressionEvaluator(this); |
| 112 | |
| 113 | mFormulaEditText.setEditableFactory(mFormulaEditableFactory); |
Justin Klaassen | 4b3af05 | 2014-05-27 17:53:10 -0700 | [diff] [blame] | 114 | mFormulaEditText.addTextChangedListener(mFormulaTextWatcher); |
Justin Klaassen | fed941a | 2014-06-09 18:42:40 +0100 | [diff] [blame] | 115 | mFormulaEditText.setOnTextSizeChangeListener(this); |
| 116 | |
Justin Klaassen | 4b3af05 | 2014-05-27 17:53:10 -0700 | [diff] [blame] | 117 | mDeleteButton.setOnLongClickListener(this); |
| 118 | } |
| 119 | |
| 120 | @Override |
Justin Klaassen | 4b3af05 | 2014-05-27 17:53:10 -0700 | [diff] [blame] | 121 | protected void onSaveInstanceState(Bundle outState) { |
| 122 | super.onSaveInstanceState(outState); |
| 123 | outState.putInt(CALCULATOR_ACTIVITY_CURRENT_STATE, mCurrentState.ordinal()); |
| 124 | } |
| 125 | |
| 126 | private void setState(CalculatorState state) { |
| 127 | if (mCurrentState != state) { |
| 128 | mCurrentState = state; |
| 129 | |
| 130 | if (state == CalculatorState.RESULT || state == CalculatorState.ERROR) { |
| 131 | mDeleteButton.setVisibility(View.GONE); |
| 132 | mClearButton.setVisibility(View.VISIBLE); |
| 133 | } else { |
| 134 | mDeleteButton.setVisibility(View.VISIBLE); |
| 135 | mClearButton.setVisibility(View.GONE); |
| 136 | } |
| 137 | |
| 138 | if (state == CalculatorState.ERROR) { |
| 139 | final int errorColor = getResources().getColor(R.color.calculator_error_color); |
| 140 | mFormulaEditText.setTextColor(errorColor); |
| 141 | mResultEditText.setTextColor(errorColor); |
| 142 | getWindow().setStatusBarColor(errorColor); |
| 143 | } else { |
| 144 | mFormulaEditText.setTextColor( |
| 145 | getResources().getColor(R.color.display_formula_text_color)); |
| 146 | mResultEditText.setTextColor( |
| 147 | getResources().getColor(R.color.display_result_text_color)); |
| 148 | getWindow().setStatusBarColor( |
| 149 | getResources().getColor(R.color.calculator_accent_color)); |
| 150 | } |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | @Override |
Justin Klaassen | 3b4d13d | 2014-06-06 18:18:37 +0100 | [diff] [blame] | 155 | public void onBackPressed() { |
| 156 | if (mPadViewPager == null || mPadViewPager.getCurrentItem() == 0) { |
| 157 | // If the user is currently looking at the first pad (or the pad is not paged), |
| 158 | // allow the system to handle the Back button. |
| 159 | super.onBackPressed(); |
| 160 | } else { |
| 161 | // Otherwise, select the previous pad. |
| 162 | mPadViewPager.setCurrentItem(mPadViewPager.getCurrentItem() - 1); |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | @Override |
Justin Klaassen | 4b3af05 | 2014-05-27 17:53:10 -0700 | [diff] [blame] | 167 | public void onUserInteraction() { |
| 168 | super.onUserInteraction(); |
| 169 | |
| 170 | // If there's an animation in progress, cancel it so the user interaction can be handled |
| 171 | // immediately. |
| 172 | if (mCurrentAnimator != null) { |
| 173 | mCurrentAnimator.cancel(); |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | public void onButtonClick(View view) { |
| 178 | switch (view.getId()) { |
| 179 | case R.id.eq: |
| 180 | if (mCurrentState != CalculatorState.INPUT) { |
| 181 | mFormulaEditText.getEditableText().clear(); |
| 182 | } else { |
| 183 | setState(CalculatorState.EVALUATE); |
| 184 | mEvaluator.evaluate(mFormulaEditText.getText(), this); |
| 185 | } |
| 186 | break; |
| 187 | case R.id.del: |
| 188 | mFormulaEditText.dispatchKeyEvent( |
| 189 | new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DEL)); |
| 190 | break; |
| 191 | case R.id.clr: |
| 192 | onClear(view); |
| 193 | break; |
| 194 | case R.id.fun_cos: |
| 195 | case R.id.fun_ln: |
| 196 | case R.id.fun_log: |
| 197 | case R.id.fun_sin: |
| 198 | case R.id.fun_tan: |
| 199 | // add left paren after functions |
| 200 | mFormulaEditText.append(((Button) view).getText() + "("); |
| 201 | break; |
| 202 | default: |
| 203 | mFormulaEditText.append(((Button) view).getText()); |
| 204 | break; |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | @Override |
| 209 | public boolean onLongClick(View view) { |
| 210 | if (view.getId() == R.id.del) { |
| 211 | onClear(view); |
| 212 | return true; |
| 213 | } |
| 214 | return false; |
| 215 | } |
| 216 | |
| 217 | @Override |
| 218 | public void onEvaluate(String expr, String result, String error) { |
| 219 | if (mCurrentState == CalculatorState.INPUT) { |
| 220 | mResultEditText.setText(result); |
| 221 | } else if (!TextUtils.isEmpty(error)) { |
| 222 | setState(CalculatorState.ERROR); |
| 223 | mResultEditText.setText(error); |
| 224 | } else if (!TextUtils.isEmpty(result)) { |
| 225 | onResult(result); |
| 226 | } else if (mCurrentState == CalculatorState.EVALUATE) { |
| 227 | // The current expression cannot be evaluated -> return to the input state. |
| 228 | setState(CalculatorState.INPUT); |
| 229 | } |
| 230 | } |
| 231 | |
Justin Klaassen | fed941a | 2014-06-09 18:42:40 +0100 | [diff] [blame] | 232 | @Override |
| 233 | public void onTextSizeChanged(final TextView textView, float oldSize) { |
| 234 | if (mCurrentState != CalculatorState.INPUT) { |
| 235 | // Only animate text changes that occur from user input. |
| 236 | return; |
| 237 | } |
| 238 | |
| 239 | // Calculate the values needed to perform the scale and translation animations, |
| 240 | // maintaining the same apparent baseline for the displayed text. |
| 241 | final float textScale = oldSize / textView.getTextSize(); |
| 242 | final float translationX = (1.0f - textScale) * |
| 243 | (textView.getWidth() / 2.0f - textView.getPaddingEnd()); |
| 244 | final float translationY = (1.0f - textScale) * |
| 245 | (textView.getHeight() / 2.0f - textView.getPaddingBottom()); |
| 246 | |
| 247 | final AnimatorSet animatorSet = new AnimatorSet(); |
| 248 | animatorSet.playTogether( |
| 249 | ObjectAnimator.ofFloat(textView, View.SCALE_X, textScale, 1.0f), |
| 250 | ObjectAnimator.ofFloat(textView, View.SCALE_Y, textScale, 1.0f), |
| 251 | ObjectAnimator.ofFloat(textView, View.TRANSLATION_X, translationX, 0.0f), |
| 252 | ObjectAnimator.ofFloat(textView, View.TRANSLATION_Y, translationY, 0.0f)); |
| 253 | animatorSet.setDuration(getResources().getInteger(android.R.integer.config_shortAnimTime)); |
| 254 | animatorSet.setInterpolator(new AccelerateDecelerateInterpolator()); |
| 255 | animatorSet.start(); |
| 256 | } |
| 257 | |
Justin Klaassen | 4b3af05 | 2014-05-27 17:53:10 -0700 | [diff] [blame] | 258 | private void onClear(View sourceView) { |
| 259 | final int[] clearLocation = new int[2]; |
| 260 | sourceView.getLocationInWindow(clearLocation); |
| 261 | clearLocation[0] += sourceView.getWidth() / 2; |
| 262 | clearLocation[1] += sourceView.getHeight() / 2; |
| 263 | |
| 264 | final int[] revealLocation = new int[2]; |
| 265 | mRevealView.getLocationInWindow(revealLocation); |
| 266 | |
| 267 | final int revealCenterX = clearLocation[0] - revealLocation[0]; |
| 268 | final int revealCenterY = clearLocation[1] - revealLocation[1]; |
| 269 | |
| 270 | final double x1_2 = Math.pow(mRevealView.getLeft() - revealCenterX, 2); |
| 271 | final double x2_2 = Math.pow(mRevealView.getRight() - revealCenterX, 2); |
| 272 | final double y_2 = Math.pow(mRevealView.getTop() - revealCenterY, 2); |
| 273 | final float revealRadius = (float) Math.max(Math.sqrt(x1_2 + y_2), Math.sqrt(x2_2 + y_2)); |
| 274 | |
ztenghui | 3d6ecaf | 2014-06-05 09:56:00 -0700 | [diff] [blame] | 275 | final Animator clearAnimator = |
| 276 | ViewAnimationUtils.createCircularReveal(mRevealView, |
| 277 | revealCenterX, revealCenterY, 0.0f, revealRadius); |
Justin Klaassen | 4b3af05 | 2014-05-27 17:53:10 -0700 | [diff] [blame] | 278 | clearAnimator.setDuration( |
| 279 | getResources().getInteger(android.R.integer.config_longAnimTime)); |
| 280 | clearAnimator.addListener(new AnimatorListenerAdapter() { |
| 281 | @Override |
| 282 | public void onAnimationEnd(Animator animation) { |
| 283 | // Clear the formula after the reveal is finished, but before it's faded out. |
| 284 | mFormulaEditText.getEditableText().clear(); |
| 285 | } |
| 286 | }); |
| 287 | |
| 288 | final Animator alphaAnimator = ObjectAnimator.ofFloat(mRevealView, View.ALPHA, 0.0f); |
| 289 | alphaAnimator.setDuration( |
| 290 | getResources().getInteger(android.R.integer.config_shortAnimTime)); |
| 291 | |
| 292 | final AnimatorSet animatorSet = new AnimatorSet(); |
| 293 | animatorSet.play(clearAnimator).before(alphaAnimator); |
| 294 | animatorSet.setInterpolator(new AccelerateDecelerateInterpolator()); |
| 295 | animatorSet.addListener(new AnimatorListenerAdapter() { |
| 296 | @Override |
| 297 | public void onAnimationStart(Animator animator) { |
| 298 | mRevealView.setAlpha(1.0f); |
| 299 | mRevealView.setVisibility(View.VISIBLE); |
| 300 | } |
| 301 | |
| 302 | @Override |
| 303 | public void onAnimationEnd(Animator animator) { |
| 304 | mRevealView.setVisibility(View.GONE); |
| 305 | mCurrentAnimator = null; |
| 306 | } |
| 307 | }); |
| 308 | |
| 309 | mCurrentAnimator = animatorSet; |
| 310 | animatorSet.start(); |
| 311 | } |
| 312 | |
| 313 | private void onResult(final String result) { |
| 314 | // Calculate the values needed to perform the scale and translation animations, |
| 315 | // accounting for how the scale will affect the final position of the text. |
| 316 | final float resultScale = |
| 317 | mFormulaEditText.getVariableTextSize(result) / mResultEditText.getTextSize(); |
| 318 | final float resultTranslationX = (1.0f - resultScale) * |
| 319 | (mResultEditText.getWidth() / 2.0f - mResultEditText.getPaddingEnd()); |
| 320 | final float resultTranslationY = (1.0f - resultScale) * |
| 321 | (mResultEditText.getHeight() / 2.0f - mResultEditText.getPaddingBottom()) + |
| 322 | (mFormulaEditText.getBottom() - mResultEditText.getBottom()) + |
| 323 | (mResultEditText.getPaddingBottom() - mFormulaEditText.getPaddingBottom()); |
| 324 | final float formulaTranslationY = -mFormulaEditText.getBottom(); |
| 325 | |
| 326 | // Use a value animator to fade to the final text color over the course of the animation. |
| 327 | final int resultTextColor = mResultEditText.getCurrentTextColor(); |
| 328 | final int formulaTextColor = mFormulaEditText.getCurrentTextColor(); |
| 329 | final ValueAnimator textColorAnimator = |
| 330 | ValueAnimator.ofObject(new ArgbEvaluator(), resultTextColor, formulaTextColor); |
| 331 | textColorAnimator.addUpdateListener(new AnimatorUpdateListener() { |
| 332 | @Override |
| 333 | public void onAnimationUpdate(ValueAnimator valueAnimator) { |
| 334 | mResultEditText.setTextColor((int) valueAnimator.getAnimatedValue()); |
| 335 | } |
| 336 | }); |
| 337 | |
| 338 | final AnimatorSet animatorSet = new AnimatorSet(); |
| 339 | animatorSet.playTogether( |
| 340 | textColorAnimator, |
| 341 | ObjectAnimator.ofFloat(mResultEditText, View.SCALE_X, resultScale), |
| 342 | ObjectAnimator.ofFloat(mResultEditText, View.SCALE_Y, resultScale), |
| 343 | ObjectAnimator.ofFloat(mResultEditText, View.TRANSLATION_X, resultTranslationX), |
| 344 | ObjectAnimator.ofFloat(mResultEditText, View.TRANSLATION_Y, resultTranslationY), |
| 345 | ObjectAnimator.ofFloat(mFormulaEditText, View.TRANSLATION_Y, formulaTranslationY)); |
| 346 | animatorSet.setDuration(getResources().getInteger(android.R.integer.config_longAnimTime)); |
| 347 | animatorSet.setInterpolator(new AccelerateDecelerateInterpolator()); |
| 348 | animatorSet.addListener(new AnimatorListenerAdapter() { |
| 349 | @Override |
| 350 | public void onAnimationStart(Animator animation) { |
| 351 | mResultEditText.setText(result); |
| 352 | } |
| 353 | |
| 354 | @Override |
| 355 | public void onAnimationEnd(Animator animation) { |
| 356 | // Reset all of the values modified during the animation. |
| 357 | mResultEditText.setTextColor(resultTextColor); |
| 358 | mResultEditText.setScaleX(1.0f); |
| 359 | mResultEditText.setScaleY(1.0f); |
| 360 | mResultEditText.setTranslationX(0.0f); |
| 361 | mResultEditText.setTranslationY(0.0f); |
| 362 | mFormulaEditText.setTranslationY(0.0f); |
| 363 | |
| 364 | // Finally update the formula to use the current result. |
| 365 | mFormulaEditText.setText(result); |
| 366 | setState(CalculatorState.RESULT); |
| 367 | |
| 368 | mCurrentAnimator = null; |
| 369 | } |
| 370 | }); |
| 371 | |
| 372 | mCurrentAnimator = animatorSet; |
| 373 | animatorSet.start(); |
| 374 | } |
| 375 | } |