Add E button to EditVariableFragment

app/src/main/java/org/solovyev/android/calculator/EditorView.java

@@ -22,14 +22,11 @@
 
 package org.solovyev.android.calculator;
 
-import android.annotation.TargetApi;
 import android.content.Context;
-import android.os.Build;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.util.AttributeSet;
 import android.view.ContextMenu;
-
 import org.solovyev.android.Check;
 import org.solovyev.android.calculator.view.EditTextCompat;
 import org.solovyev.android.views.Adjuster;
@@ -58,12 +55,6 @@ public class EditorView extends EditTextCompat {
         init();
     }
 
-    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
-    public EditorView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
-        super(context, attrs, defStyleAttr, defStyleRes);
-        init();
-    }
-
     private void init() {
         if (!App.isFloatingCalculator(getContext())) {
             Adjuster.adjustText(this, 0.22f,

app/src/main/java/org/solovyev/android/calculator/variables/EditVariableFragment.java

@@ -34,6 +34,9 @@ import android.support.design.widget.TextInputLayout;
 import android.support.v4.app.FragmentActivity;
 import android.support.v4.app.FragmentManager;
 import android.support.v7.app.AlertDialog;
+import android.text.Editable;
+import android.text.InputFilter;
+import android.text.SpannableStringBuilder;
 import android.view.KeyEvent;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -45,10 +48,11 @@ import android.widget.PopupWindow;
 import butterknife.Bind;
 import butterknife.ButterKnife;
 import dagger.Lazy;
+import jscl.JsclMathEngine;
 import jscl.math.function.IConstant;
+import midpcalc.Real;
 import org.solovyev.android.Check;
 import org.solovyev.android.calculator.*;
-import org.solovyev.android.calculator.RemovalConfirmationDialog;
 import org.solovyev.android.calculator.functions.FunctionsRegistry;
 import org.solovyev.android.calculator.keyboard.FloatingKeyboard;
 import org.solovyev.android.calculator.keyboard.FloatingKeyboardWindow;
@@ -87,6 +91,8 @@ public class EditVariableFragment extends BaseDialogFragment implements View.OnF
     TextInputLayout valueLabel;
     @Bind(R.id.variable_value)
     EditText valueView;
+    @Bind(R.id.variable_exponent_button)
+    Button exponentButton;
     @Bind(R.id.variable_description)
     EditText descriptionView;
     @Inject
@@ -304,6 +310,13 @@ public class EditVariableFragment extends BaseDialogFragment implements View.OnF
         nameView.setOnFocusChangeListener(this);
         nameView.setOnKeyListener(this);
         valueView.setOnFocusChangeListener(this);
+        valueView.setEditableFactory(new Editable.Factory() {
+            @Override
+            public Editable newEditable(CharSequence source) {
+                return new NoFiltersEditable(source);
+            }
+        });
+        exponentButton.setOnClickListener(this);
         descriptionView.setOnFocusChangeListener(this);
         keyboardButton.setOnClickListener(this);
 
@@ -352,6 +365,11 @@ public class EditVariableFragment extends BaseDialogFragment implements View.OnF
                     showKeyboard();
                 }
                 break;
+            case R.id.variable_exponent_button:
+                final int start = Math.max(valueView.getSelectionStart(), 0);
+                final int end = Math.max(valueView.getSelectionEnd(), 0);
+                valueView.getText().replace(Math.min(start, end), Math.max(start, end), "E", 0, 1);
+                break;
             default:
                 super.onClick(v);
                 break;
@@ -379,6 +397,17 @@ public class EditVariableFragment extends BaseDialogFragment implements View.OnF
         keyboardWindow.show(new GreekFloatingKeyboard(keyboardUser), getDialog());
     }
 
+    private static class NoFiltersEditable extends SpannableStringBuilder {
+        public NoFiltersEditable(CharSequence source) {
+            super(source);
+        }
+
+        @Override
+        public void setFilters(InputFilter[] filters) {
+            // we don't want filters as we want to support numbers in scientific notation
+        }
+    }
+
     private class KeyboardUser implements FloatingKeyboard.User {
         @NonNull
         @Override

app/src/main/java/org/solovyev/android/calculator/view/EditTextCompat.java

@@ -1,8 +1,8 @@
 package org.solovyev.android.calculator.view;
 
-import android.annotation.TargetApi;
 import android.content.Context;
 import android.os.Build;
+import android.support.design.widget.TextInputEditText;
 import android.text.InputType;
 import android.util.AttributeSet;
 import android.util.Log;
@@ -12,7 +12,7 @@ import org.solovyev.android.Check;
 import javax.annotation.Nullable;
 import java.lang.reflect.Method;
 
-public class EditTextCompat extends EditText {
+public class EditTextCompat extends TextInputEditText {
 
     @Nullable
     private static Method setShowSoftInputOnFocusMethod;
@@ -30,11 +30,6 @@ public class EditTextCompat extends EditText {
         super(context, attrs, defStyleAttr);
     }
 
-    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
-    public EditTextCompat(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
-        super(context, attrs, defStyleAttr, defStyleRes);
-    }
-
     public void dontShowSoftInputOnFocusCompat() {
         setShowSoftInputOnFocusCompat(false);
     }

app/src/main/res/layout/fragment_variable_edit.xml

@@ -65,12 +65,16 @@
                 tools:ignore="UnusedAttribute" />
         </FrameLayout>
 
+        <FrameLayout
+            a:layout_width="match_parent"
+            a:layout_height="wrap_content">
+
             <android.support.design.widget.TextInputLayout
                 a:id="@+id/variable_value_label"
                 a:layout_width="match_parent"
                 a:layout_height="wrap_content">
 
-            <org.solovyev.android.calculator.view.EditTextCompat
+                <EditText
                     a:id="@+id/variable_value"
                     a:layout_width="match_parent"
                     a:layout_height="wrap_content"
@@ -78,6 +82,20 @@
                     a:inputType="numberDecimal|numberSigned" />
             </android.support.design.widget.TextInputLayout>
 
+            <Button
+                a:id="@+id/variable_exponent_button"
+                a:layout_width="wrap_content"
+                a:layout_height="wrap_content"
+                a:layout_gravity="end|top"
+                a:background="?attr/selectableItemBackgroundBorderless"
+                a:minWidth="0dp"
+                a:padding="@dimen/cpp_image_button_padding"
+                a:text="@string/cpp_exponent"
+                a:textAllCaps="false"
+                a:textAppearance="?android:attr/textAppearanceSmall"
+                tools:ignore="UnusedAttribute" />
+        </FrameLayout>
+
         <android.support.design.widget.TextInputLayout
             a:layout_width="match_parent"
             a:layout_height="wrap_content">

app/src/main/res/values/text_non_translatable.xml

@@ -14,6 +14,8 @@
     <string name="dimensions_y_min" translatable="false">Y min</string>
     <string name="dimensions_y_max" translatable="false">Y max</string>
     <string name="cpp_function_body" translatable="false">f(x, y)</string>
+    <string name="cpp_show_greek_keyboard" translatable="false">αβγ</string>
+    <string name="cpp_exponent" translatable="false">E</string>
     <string-array name="cpp_prefs_precisions" translatable="false">
         <item>0</item>
         <item>1</item>

app/src/main/res/values/text_strings.xml

@@ -115,7 +115,6 @@
 		several devices.\n\n
 		By clicking \'Continue\' button you will be redirected to the Google Play app to make the payment.</string>
     <string name="cpp_purchase_title">Purchase</string>
-    <string name="cpp_show_greek_keyboard" translatable="false">αβγ</string>
     <string name="cpp_clear_history_title">Clear history?</string>
     <string name="cpp_clear_history_message">All history will be cleared.</string>
     <string name="cpp_clear_history">Clear</string>