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      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 
     17 package com.android.calculator2;
     18 
     19 import android.content.Context;
     20 import android.graphics.Rect;
     21 import android.text.Editable;
     22 import android.text.InputType;
     23 import android.text.Spanned;
     24 import android.text.method.NumberKeyListener;
     25 import android.util.AttributeSet;
     26 import android.view.animation.TranslateAnimation;
     27 import android.widget.EditText;
     28 import android.widget.ViewSwitcher;
     29 
     30 /**
     31  * Provides vertical scrolling for the input/result EditText.
     32  */
     33 class CalculatorDisplay extends ViewSwitcher {
     34 
     35     private static final String ATTR_MAX_DIGITS = "maxDigits";
     36     private static final int DEFAULT_MAX_DIGITS = 10;
     37 
     38     // only these chars are accepted from keyboard
     39     private static final char[] ACCEPTED_CHARS =
     40         "0123456789.+-*/\u2212\u00d7\u00f7()!%^".toCharArray();
     41 
     42     private static final int ANIM_DURATION = 500;
     43 
     44     enum Scroll { UP, DOWN, NONE }
     45 
     46     TranslateAnimation inAnimUp;
     47     TranslateAnimation outAnimUp;
     48     TranslateAnimation inAnimDown;
     49     TranslateAnimation outAnimDown;
     50 
     51     private int mMaxDigits = DEFAULT_MAX_DIGITS;
     52 
     53     public CalculatorDisplay(Context context, AttributeSet attrs) {
     54         super(context, attrs);
     55         mMaxDigits = attrs.getAttributeIntValue(null, ATTR_MAX_DIGITS, DEFAULT_MAX_DIGITS);
     56     }
     57 
     58     public int getMaxDigits() {
     59         return mMaxDigits;
     60     }
     61 
     62     protected void setLogic(Logic logic) {
     63         NumberKeyListener calculatorKeyListener =
     64             new NumberKeyListener() {
     65                 public int getInputType() {
     66                     return InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS;
     67                 }
     68 
     69                 @Override
     70                 protected char[] getAcceptedChars() {
     71                     return ACCEPTED_CHARS;
     72                 }
     73 
     74                 @Override
     75                 public CharSequence filter(CharSequence source, int start, int end,
     76                                            Spanned dest, int dstart, int dend) {
     77                     /* the EditText should still accept letters (eg. 'sin')
     78                        coming from the on-screen touch buttons, so don't filter anything.
     79                     */
     80                     return null;
     81                 }
     82             };
     83 
     84         Editable.Factory factory = new CalculatorEditable.Factory(logic);
     85         for (int i = 0; i < 2; ++i) {
     86             EditText text = (EditText) getChildAt(i);
     87             text.setBackground(null);
     88             text.setEditableFactory(factory);
     89             text.setKeyListener(calculatorKeyListener);
     90             text.setSingleLine();
     91         }
     92     }
     93 
     94     @Override
     95     public void setOnKeyListener(OnKeyListener l) {
     96         getChildAt(0).setOnKeyListener(l);
     97         getChildAt(1).setOnKeyListener(l);
     98     }
     99 
    100     @Override
    101     protected void onSizeChanged(int w, int h, int oldW, int oldH) {
    102         inAnimUp = new TranslateAnimation(0, 0, h, 0);
    103         inAnimUp.setDuration(ANIM_DURATION);
    104         outAnimUp = new TranslateAnimation(0, 0, 0, -h);
    105         outAnimUp.setDuration(ANIM_DURATION);
    106 
    107         inAnimDown = new TranslateAnimation(0, 0, -h, 0);
    108         inAnimDown.setDuration(ANIM_DURATION);
    109         outAnimDown = new TranslateAnimation(0, 0, 0, h);
    110         outAnimDown.setDuration(ANIM_DURATION);
    111     }
    112 
    113     void insert(String delta) {
    114         EditText editor = (EditText) getCurrentView();
    115         int cursor = editor.getSelectionStart();
    116         editor.getText().insert(cursor, delta);
    117     }
    118 
    119     EditText getEditText() {
    120         return (EditText) getCurrentView();
    121     }
    122 
    123     Editable getText() {
    124         EditText text = (EditText) getCurrentView();
    125         return text.getText();
    126     }
    127 
    128     void setText(CharSequence text, Scroll dir) {
    129         if (getText().length() == 0) {
    130             dir = Scroll.NONE;
    131         }
    132 
    133         if (dir == Scroll.UP) {
    134             setInAnimation(inAnimUp);
    135             setOutAnimation(outAnimUp);
    136         } else if (dir == Scroll.DOWN) {
    137             setInAnimation(inAnimDown);
    138             setOutAnimation(outAnimDown);
    139         } else { // Scroll.NONE
    140             setInAnimation(null);
    141             setOutAnimation(null);
    142         }
    143 
    144         EditText editText = (EditText) getNextView();
    145         editText.setText(text);
    146         //Calculator.log("selection to " + text.length() + "; " + text);
    147         editText.setSelection(text.length());
    148         showNext();
    149     }
    150 
    151     int getSelectionStart() {
    152         EditText text = (EditText) getCurrentView();
    153         return text.getSelectionStart();
    154     }
    155 
    156     @Override
    157     protected void onFocusChanged(boolean gain, int direction, Rect prev) {
    158         //Calculator.log("focus " + gain + "; " + direction + "; " + prev);
    159         if (!gain) {
    160             requestFocus();
    161         }
    162     }
    163 }
    164