fixes

AndroidManifest.xml

@@ -21,17 +21,22 @@
 		</activity>
 
 		<activity a:name=".CalculatorPreferencesActivity"
-				  a:label="@string/c_app_settings"/>
+				  a:label="@string/c_app_settings"
+				  a:configChanges="orientation|keyboardHidden"/>
 
 		<activity a:name=".CalculatorHistoryActivity"
-				  a:label="@string/c_app_history"/>
+				  a:label="@string/c_app_history"
+				  a:configChanges="orientation|keyboardHidden">
+		</activity>
 
 		<activity a:name=".AboutActivity"
-				  a:label="@string/c_about"/>
+				  a:label="@string/c_about"
+				  a:configChanges="orientation|keyboardHidden"/>
 
 		<activity a:name=".CalculatorVarsActivity"
 				  a:label="@string/c_vars_and_constants"
-				  a:configChanges="orientation|keyboardHidden"/>
+				  a:configChanges="orientation|keyboardHidden">
+		</activity>
 
 	</application>
 </manifest>

res/layout-land/main.xml

@@ -73,7 +73,7 @@
 
 		<LinearLayout a:layout_weight="1" a:layout_width="match_parent" a:layout_height="0dp">
 
-			<include layout="@layout/calc_equals_button"/>
+			<include layout="@layout/calc_history_button"/>
 			<include layout="@layout/calc_paste_button"/>
 			<include layout="@layout/calc_one_digit_button"/>
 			<include layout="@layout/calc_two_digit_button"/>
@@ -85,7 +85,7 @@
 
 		<LinearLayout a:layout_weight="1" a:layout_width="match_parent" a:layout_height="0dp">
 
-			<include layout="@layout/calc_history_button"/>
+			<include layout="@layout/calc_vars_button"/>
 			<include layout="@layout/calc_copy_button"/>
 			<include layout="@layout/calc_four_digit_button"/>
 			<include layout="@layout/calc_five_digit_button"/>
@@ -93,12 +93,11 @@
 			<include layout="@layout/calc_plus_button"/>
 			<include layout="@layout/calc_subtraction_button"/>
 
-
 		</LinearLayout>
 
 		<LinearLayout a:layout_weight="1" a:layout_width="match_parent" a:layout_height="0dp">
 
-			<include layout="@layout/calc_vars_button"/>
+			<include layout="@layout/calc_donate_button"/>
 			<include layout="@layout/calc_square_brackets_button"/>
 			<include layout="@layout/calc_seven_digit_button"/>
 			<include layout="@layout/calc_eight_digit_button"/>

res/layout-port/main.xml

@@ -17,15 +17,9 @@
 
 		<LinearLayout a:layout_weight="1" a:layout_width="match_parent" a:layout_height="0dp">
 
-			<include layout="@layout/calc_equals_button"
-					 a:layout_weight="4"
-					 a:layout_height="match_parent"
-					 a:layout_width="match_parent" />
-
 			<include layout="@layout/calc_display"
 					 a:layout_width="match_parent"
-					 a:layout_height="match_parent"
+					 a:layout_height="match_parent"/>
-					 a:layout_weight="1"/>
 
 		</LinearLayout>
 

res/menu/history_menu.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+  ~ For more information, please, contact se.solovyev@gmail.com
+  ~ or visit http://se.solovyev.org
+  -->
+
+<menu xmlns:a="http://schemas.android.com/apk/res/android">
+
+	<item a:id="@+id/history_menu_clear_history"
+		  a:title="@string/c_clear_history"/>
+
+</menu>

res/values-ru/strings.xml

@@ -82,5 +82,5 @@
 	<string name="c_calc_result_precision_summary">Точность результата(все вычисления производятся максимально точно)</string>
 	<string name="c_calc_color_display_summary">Включает/выключает подсветку синтаксиса в поле редактирования калькулятора</string>
 	<string name="c_calc_theme_summary">Устанавливает тему оформления приложения</string>
-
+	<string name="c_clear_history">Очистить историю</string>
 </resources>

res/values/strings.xml

@@ -82,4 +82,5 @@
 	<string name="c_calc_result_precision_summary">Precision of result value (all calculations are done with maximum precision regardless of the value of this option)</string>
 	<string name="c_calc_color_display_summary">Enables/disables colouring and styling in calculator editor</string>
 	<string name="c_calc_theme_summary">Sets the theme for calculator</string>
+	<string name="c_clear_history">Clear history</string>
 </resources>

src/main/java/org/solovyev/android/calculator/CalculatorActivity.java

@@ -67,6 +67,8 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 	// ids of drag buttons in R.class
 	private List<Integer> dragButtonIds = null;
 
+	@NotNull
+	private final static Object broadcastReceiverLock = new Object();
 
 	/**
 	 * Called when the activity is first created.
@@ -83,7 +85,7 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 
 		firstTimeInit();
 
-		init();
+		init(preferences);
 
 		dpclRegister.clear();
 
@@ -100,9 +102,9 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 		((DragButton) findViewById(R.id.leftButton)).setOnDragListener(toPositionOnDragListener);
 		dpclRegister.addListener(toPositionOnDragListener);
 
-		preferences.registerOnSharedPreferenceChangeListener(this);
+		CalculatorModel.instance.reset(this, preferences);
 
-		this.onSharedPreferenceChanged(preferences, null);
+		preferences.registerOnSharedPreferenceChangeListener(this);
 	}
 
 	private synchronized void setOnDragListeners(@NotNull SimpleOnDragListener.Preferences dragPreferences) {
@@ -164,25 +166,31 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 		setTheme(styleId);
 	}
 
-	private void init() {
+	private void init(@NotNull SharedPreferences preferences) {
 
-		calculatorView = new CalculatorView(this, CalculatorModel.instance);
+		synchronized (broadcastReceiverLock) {
+			calculatorView = new CalculatorView(this, preferences, CalculatorModel.instance);
+		}
 
 		textReceiver = new BroadcastReceiver() {
 			@Override
 			public void onReceive(Context context, Intent intent) {
+				synchronized (broadcastReceiverLock) {
+					Log.d(this.getClass().getName(), "Intent received: " + intent.getAction());
 					if (INSERT_TEXT_INTENT.equals(intent.getAction())) {
 						final String s = intent.getStringExtra(INSERT_TEXT_INTENT_EXTRA_STRING);
+						Log.d(this.getClass().getName(), "Extra data: " + s);
 						if (!StringUtils.isEmpty(s)) {
 							calculatorView.doTextOperation(new CalculatorView.TextOperation() {
 								@Override
 								public void doOperation(@NotNull EditText editor) {
 									editor.getText().insert(editor.getSelectionStart(), s);
 								}
-						});
+							}, false);
 						}
 					} else if (SET_TEXT_INTENT.equals(intent.getAction())) {
 						final String s = intent.getStringExtra(SET_TEXT_INTENT_EXTRA_STRING);
+						Log.d(this.getClass().getName(), "Extra data: " + s);
 						if (!StringUtils.isEmpty(s)) {
 							calculatorView.doTextOperation(new CalculatorView.TextOperation() {
 								@Override
@@ -190,7 +198,8 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 									editor.setText(s);
 									calculatorView.setCursorOnEnd();
 								}
-						});
+							}, false);
+						}
 					}
 				}
 			}
@@ -203,7 +212,7 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 	private synchronized void firstTimeInit() {
 		if (!initialized) {
 			try {
-				CalculatorModel.instance.init(this);
+				CalculatorModel.instance.init(this, PreferenceManager.getDefaultSharedPreferences(this));
 			} catch (EvalError evalError) {
 				throw new RuntimeException("Could not initialize interpreter!");
 			}
@@ -409,22 +418,27 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 		super.onResume();
 
 		final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
+
 		final String newThemeName = preferences.getString(getString(R.string.p_calc_theme_key), getString(R.string.p_calc_theme));
 		if (!newThemeName.equals(themeName)) {
 			restart();
 		}
+
+		synchronized (broadcastReceiverLock) {
+			calculatorView = new CalculatorView(this, preferences, CalculatorModel.instance);
+		}
+
+		this.calculatorView.evaluate();
 	}
 
 	@Override
 	public void onSharedPreferenceChanged(SharedPreferences preferences, @Nullable String s) {
 		dpclRegister.announce().onDragPreferencesChange(SimpleOnDragListener.getPreferences(preferences, this));
 
-		CalculatorModel.instance.reset(this);
+		CalculatorModel.instance.reset(this, preferences);
 
 		final Boolean colorExpressionsInBracketsDefault = new BooleanMapper().parseValue(this.getString(R.string.p_calc_color_display));
 		assert colorExpressionsInBracketsDefault != null;
 		this.calculatorView.getEditor().setHighlightText(preferences.getBoolean(this.getString(R.string.p_calc_color_display_key), colorExpressionsInBracketsDefault));
-
-		this.calculatorView.evaluate();
 	}
 }

src/main/java/org/solovyev/android/calculator/CalculatorDisplayHistoryState.java

@@ -67,4 +67,12 @@ public class CalculatorDisplayHistoryState {
 		result = 31 * result + (editorHistoryState != null ? editorHistoryState.hashCode() : 0);
 		return result;
 	}
+
+	@Override
+	public String toString() {
+		return "CalculatorDisplayHistoryState{" +
+				"valid=" + valid +
+				", editorHistoryState=" + editorHistoryState +
+				'}';
+	}
 }

src/main/java/org/solovyev/android/calculator/CalculatorEditor.java

@@ -53,6 +53,11 @@ public class CalculatorEditor extends EditText {
 		menu.removeItem(android.R.id.startSelectingText);
 	}
 
+	@Override
+	public void setText(CharSequence text, BufferType type) {
+		super.setText(text, type);
+	}
+
 	public synchronized void redraw() {
 		String text = getText().toString();
 

src/main/java/org/solovyev/android/calculator/CalculatorHistory.java

@@ -75,4 +75,9 @@ public enum CalculatorHistory implements HistoryHelper<CalculatorHistoryState> {
 	public List<CalculatorHistoryState> getStates() {
 		return historyHelper.getStates();
 	}
+
+	@Override
+	public void clear() {
+		this.historyHelper.clear();
+	}
 }

src/main/java/org/solovyev/android/calculator/CalculatorHistoryActivity.java

@@ -10,12 +10,13 @@ import android.app.ListActivity;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
-import android.view.View;
+import android.view.*;
-import android.view.ViewGroup;
 import android.widget.*;
 import org.jetbrains.annotations.NotNull;
-import org.solovyev.common.utils.*;
 import org.solovyev.common.utils.Filter;
+import org.solovyev.common.utils.FilterRule;
+import org.solovyev.common.utils.FilterRulesChain;
+import org.solovyev.common.utils.StringUtils;
 
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
@@ -103,4 +104,33 @@ public class CalculatorHistoryActivity extends ListActivity {
 			return result;
 		}
 	}
+
+	@Override
+	public boolean onCreateOptionsMenu(Menu menu) {
+		final MenuInflater menuInflater = getMenuInflater();
+		menuInflater.inflate(R.menu.history_menu, menu);
+		return true;
+	}
+
+	@Override
+	public boolean onOptionsItemSelected(MenuItem item) {
+		boolean result;
+
+		switch (item.getItemId()) {
+			case R.id.history_menu_clear_history:
+				clearHistory();
+				result = true;
+				break;
+			default:
+				result = super.onOptionsItemSelected(item);
+		}
+
+		return result;
+	}
+
+	private void clearHistory() {
+		CalculatorHistory.instance.clear();
+		Toast.makeText(this, R.string.c_history_is_empty, Toast.LENGTH_SHORT).show();
+		this.finish();
+	}
 }

src/main/java/org/solovyev/android/calculator/CalculatorHistoryState.java

@@ -43,4 +43,12 @@ public class CalculatorHistoryState extends AbstractHistoryState{
 	public void setDisplayState(@NotNull CalculatorDisplayHistoryState displayState) {
 		this.displayState = displayState;
 	}
+
+	@Override
+	public String toString() {
+		return "CalculatorHistoryState{" +
+				"editorState=" + editorState +
+				", displayState=" + displayState +
+				'}';
+	}
 }

src/main/java/org/solovyev/android/calculator/CalculatorView.java

@@ -7,6 +7,7 @@ package org.solovyev.android.calculator;
 
 import android.app.Activity;
 import android.content.Context;
+import android.content.SharedPreferences;
 import android.os.Handler;
 import android.text.ClipboardManager;
 import android.util.Log;
@@ -22,6 +23,7 @@ import org.solovyev.android.calculator.model.CalculatorModel;
 import org.solovyev.android.calculator.model.ParseException;
 import org.solovyev.android.view.CursorControl;
 import org.solovyev.android.view.HistoryControl;
+import org.solovyev.common.BooleanMapper;
 import org.solovyev.common.utils.MutableObject;
 import org.solovyev.common.utils.StringUtils;
 import org.solovyev.common.utils.history.HistoryAction;
@@ -45,11 +47,15 @@ public class CalculatorView implements CursorControl, HistoryControl<CalculatorH
 	@NotNull
 	private final CalculatorModel calculatorModel;
 
-	public CalculatorView(@NotNull final Activity activity, @NotNull CalculatorModel calculator) {
+	public CalculatorView(@NotNull final Activity activity, @NotNull SharedPreferences preferences, @NotNull CalculatorModel calculator) {
 		this.calculatorModel = calculator;
 
 		this.editor = (CalculatorEditor) activity.findViewById(R.id.calculatorEditor);
 
+		final Boolean colorExpressionsInBracketsDefault = new BooleanMapper().parseValue(activity.getString(R.string.p_calc_color_display));
+		assert colorExpressionsInBracketsDefault != null;
+		this.editor.setHighlightText(preferences.getBoolean(activity.getString(R.string.p_calc_color_display_key), colorExpressionsInBracketsDefault));
+
 		this.display = (CalculatorDisplay) activity.findViewById(R.id.calculatorDisplay);
 		this.display.setOnClickListener(new View.OnClickListener() {
 			@Override
@@ -83,7 +89,6 @@ public class CalculatorView implements CursorControl, HistoryControl<CalculatorH
 		CalculatorHistory.instance.addState(getCurrentHistoryState());
 	}
 
-
 	public void setCursorOnStart() {
 		editor.setSelection(0);
 	}
@@ -104,61 +109,75 @@ public class CalculatorView implements CursorControl, HistoryControl<CalculatorH
 		}
 	}
 
-	@NotNull
+	public void doTextOperation(@NotNull TextOperation operation) {
-	private final MutableObject<Runnable> currentRunner = new MutableObject<Runnable>();
+		doTextOperation(operation, true);
+	}
 
-	public synchronized void doTextOperation(@NotNull TextOperation operation) {
+	public void doTextOperation(@NotNull TextOperation operation, boolean delayEvaluate) {
 		final String editorStateBefore = this.editor.getText().toString();
 
 		operation.doOperation(this.editor);
+		//Log.d(CalculatorView.class.getName(), "Doing text operation" + StringUtils.fromStackTrace(Thread.currentThread().getStackTrace()));
 
 		final String editorStateAfter = this.editor.getText().toString();
 		if (!editorStateBefore.equals(editorStateAfter)) {
 
 			editor.redraw();
 
-			currentRunner.setObject(new Runnable() {
+			evaluate(delayEvaluate, editorStateAfter);
+		}
+	}
+
+	@NotNull
+	private final static MutableObject<Runnable> pendingOperation = new MutableObject<Runnable>();
+
+	private void evaluate(boolean delayEvaluate, @NotNull final String expression) {
+		final CalculatorHistoryState historyState = getCurrentHistoryState();
+
+		pendingOperation.setObject(new Runnable() {
 			@Override
 			public void run() {
 				// allow only one runner at one time
-					synchronized (currentRunner) {
+				synchronized (pendingOperation) {
 					//lock all operations with history
-						synchronized (CalculatorHistory.instance) {
+					if (pendingOperation.getObject() == this) {
-							// do only if nothing was post delayed before current instance was posted
-							if (currentRunner.getObject() == this) {
 						// actually nothing shall be logged while text operations are done
-								evaluate(editorStateAfter);
+						evaluate(expression);
 
-								if (CalculatorHistory.instance.isUndoAvailable()) {
+						historyState.setDisplayState(getCurrentHistoryState().getDisplayState());
-									CalculatorHistory.instance.undo(getCurrentHistoryState());
-								}
 
-								saveHistoryState();
+						pendingOperation.setObject(null);
-							}
 					}
 				}
 			}
 		});
 
-			new Handler().postDelayed(currentRunner.getObject(), EVAL_DELAY_MILLIS);
+		if (delayEvaluate) {
-
+			CalculatorHistory.instance.addState(historyState);
-			saveHistoryState();
+			new Handler().postDelayed(pendingOperation.getObject(), EVAL_DELAY_MILLIS);
+		} else {
+			pendingOperation.getObject().run();
+			CalculatorHistory.instance.addState(historyState);
 		}
 	}
 
+	public void evaluate() {
+   		evaluate(false, this.editor.getText().toString());
+	}
+
 	private void evaluate(@Nullable final String expression) {
-		if (!StringUtils.isEmpty(expression)) {
-
 		final CalculatorDisplay localDisplay = display;
-
+		if (!StringUtils.isEmpty(expression)) {
 			try {
-				Log.d(CalculatorView.class.getName(), "Trying to evaluate: " + expression);
+				Log.d(CalculatorView.class.getName(), "Trying to evaluate: " + expression /*+ StringUtils.fromStackTrace(Thread.currentThread().getStackTrace())*/);
 				localDisplay.setText(calculatorModel.evaluate(JsclOperation.numeric, expression));
 			} catch (EvalError e) {
 				handleEvaluationException(expression, localDisplay, e);
 			} catch (ParseException e) {
 				handleEvaluationException(expression, localDisplay, e);
 			}
+		} else {
+			localDisplay.setText("");
 		}
 	}
 
@@ -176,10 +195,6 @@ public class CalculatorView implements CursorControl, HistoryControl<CalculatorH
 		}
 	}
 
-	public void evaluate() {
-		evaluate(editor.getText().toString());
-	}
-
 	public void processDigitButtonAction(@Nullable final String text) {
 		//Toast.makeText(CalculatorActivity.this, text, Toast.LENGTH_SHORT).show();
 
@@ -231,6 +246,7 @@ public class CalculatorView implements CursorControl, HistoryControl<CalculatorH
 	@Override
 	public void setCurrentHistoryState(@NotNull CalculatorHistoryState editorHistoryState) {
 		synchronized (CalculatorHistory.instance) {
+			Log.d(this.getClass().getName(), "Saved history found: " + editorHistoryState);
 			setValuesFromHistory(this.editor, editorHistoryState.getEditorState());
 			setValuesFromHistory(this.display, editorHistoryState.getDisplayState());
 

src/main/java/org/solovyev/android/calculator/EditorHistoryState.java

@@ -58,4 +58,12 @@ public class EditorHistoryState {
 		result = 31 * result + (text != null ? text.hashCode() : 0);
 		return result;
 	}
+
+	@Override
+	public String toString() {
+		return "EditorHistoryState{" +
+				"cursorPosition=" + cursorPosition +
+				", text='" + text + '\'' +
+				'}';
+	}
 }

src/main/java/org/solovyev/android/calculator/model/CalculatorModel.java

@@ -7,14 +7,12 @@ package org.solovyev.android.calculator.model;
 
 import android.content.Context;
 import android.content.SharedPreferences;
-import android.preference.PreferenceManager;
 import bsh.EvalError;
 import bsh.Interpreter;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.calculator.JsclOperation;
 import org.solovyev.common.NumberMapper;
-import org.solovyev.common.utils.MutableObject;
 
 /**
  * User: serso
@@ -68,24 +66,22 @@ public enum CalculatorModel {
 		this.numberOfFractionDigits = numberOfFractionDigits;
 	}
 
-	public void init(@Nullable Context context) throws EvalError {
+	public void init(@Nullable Context context, @Nullable SharedPreferences preferences) throws EvalError {
 		synchronized (lock) {
-			reset(context);
+			reset(context, preferences);
 			resetInterpreter();
 		}
 	}
 
-	public void reset(@Nullable Context context) {
+	public void reset(@Nullable Context context, @Nullable SharedPreferences preferences) {
 		synchronized (lock) {
-			if (context != null) {
+			if (preferences != null) {
-				final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
-
 				final NumberMapper<Integer> integerNumberMapper = new NumberMapper<Integer>(Integer.class);
 				//noinspection ConstantConditions
 				this.setNumberOfFractionDigits(integerNumberMapper.parseValue(preferences.getString(RESULT_PRECISION_P_KEY, RESULT_PRECISION_DEFAULT)));
 			}
 
-			varsRegister.init(context);
+			varsRegister.init(context, preferences);
 		}
 	}
 

src/main/java/org/solovyev/android/calculator/model/VarsRegisterImpl.java

@@ -118,14 +118,12 @@ class VarsRegisterImpl implements VarsRegister {
 		vars.addAll(result);
 	}
 
-	synchronized void init(@Nullable Context context) {
+	synchronized void init(@Nullable Context context, @Nullable SharedPreferences preferences) {
 
 		this.vars.clear();
 		this.systemVars.clear();
 
-		if (context != null) {
+		if (context != null && preferences != null) {
-			final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
-
 			final String value = preferences.getString(context.getString(R.string.p_calc_vars), null);
 			if (value != null) {
 				final Serializer serializer = new Persister();

src/test/java/org/solovyev/android/calculator/math/MathTypeTest.java

@@ -20,7 +20,7 @@ public class MathTypeTest {
 
 	@BeforeClass
 	public static void setUp() throws Exception {
-		CalculatorModel.instance.init(null);
+		CalculatorModel.instance.init(null, null);
 	}
 
 	@Test

src/test/java/org/solovyev/android/calculator/model/CalculatorModelTest.java

@@ -21,7 +21,7 @@ public class CalculatorModelTest {
 
 	@BeforeClass
 	public static void setUp() throws Exception {
-		CalculatorModel.instance.init(null);
+		CalculatorModel.instance.init(null, null);
 	}
 
 	@Test

src/test/java/org/solovyev/android/calculator/model/ToJsclTextProcessorTest.java

@@ -9,7 +9,6 @@ package org.solovyev.android.calculator.model;
 import org.junit.Assert;
 import org.junit.BeforeClass;
 import org.junit.Test;
-import org.solovyev.android.calculator.JsclOperation;
 
 /**
  * User: serso
@@ -20,7 +19,7 @@ public class ToJsclTextProcessorTest {
 
 	@BeforeClass
 	public static void setUp() throws Exception {
-		CalculatorModel.instance.init(null);
+		CalculatorModel.instance.init(null, null);
 	}
 
 	@Test