refactor

res/layout-land/main.xml

@@ -15,7 +15,7 @@
 
 		<LinearLayout a:layout_weight="2" a:layout_width="match_parent" a:layout_height="0dp">
 
-			<EditText
+			<org.solovyev.android.calculator.CalculatorEditText
 					a:id="@+id/editText"
 					style="@style/display_style"
 					a:inputType="textMultiLine"

res/layout-port/main.xml

@@ -15,7 +15,7 @@
 
 		<LinearLayout a:layout_weight="2" a:layout_width="match_parent" a:layout_height="0dp">
 
-			<EditText
+			<org.solovyev.android.calculator.CalculatorEditText
 					a:id="@+id/editText"
 					style="@style/display_style"
 					a:inputType="textMultiLine"

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

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.calculator;
 
 import android.app.Activity;
@@ -16,8 +21,6 @@ import bsh.EvalError;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.view.*;
-import org.solovyev.common.utils.Point2d;
-import org.solovyev.common.utils.StringUtils;
 import org.solovyev.common.utils.history.HistoryAction;
 
 import java.lang.reflect.Field;
@@ -33,10 +36,10 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster {
 	private List<SimpleOnDragListener> onDragListeners = new ArrayList<SimpleOnDragListener>();
 
 	@NotNull
-	private CalculatorView view;
+	private CalculatorView calculatorView;
 
 	@NotNull
-	private CalculatorModel calculator;
+	private CalculatorModel calculatorModel;
 
 	@NotNull
 	private BroadcastReceiver preferencesChangesReceiver;
@@ -50,26 +53,17 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster {
 		setContentView(R.layout.main);
 
 		try {
-			this.calculator = new CalculatorModel();
+			this.calculatorModel = new CalculatorModel();
 		} catch (EvalError evalError) {
 			// todo serso: create serso runtime exception
 			throw new RuntimeException("Could not initialize interpreter!");
 		}
 
-		this.view = new CalculatorView(this, this.calculator);
+		this.calculatorView = new CalculatorView(this, this.calculatorModel);
 
 		final DragButtonCalibrationActivity.Preferences dragPreferences = DragButtonCalibrationActivity.getPreferences(this);
 
-		final SimpleOnDragListener onDragListener = new SimpleOnDragListener(new SimpleOnDragListener.DragProcessor() {
+		final SimpleOnDragListener onDragListener = new SimpleOnDragListener(new DigitButtonDragProcessor(calculatorView), dragPreferences);
-			@Override
-			public boolean processDragEvent(@NotNull DragDirection dragDirection, @NotNull DragButton dragButton, @NotNull Point2d startPoint2d, @NotNull MotionEvent motionEvent) {
-				assert dragButton instanceof DirectionDragButton;
-				view.processButtonAction(getActionText((DirectionDragButton) dragButton, dragDirection));
-				return true;
-			}
-
-		}, dragPreferences);
-
 		onDragListeners.add(onDragListener);
 
 		// todo serso: check if there is more convenient method for doing this
@@ -90,27 +84,11 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster {
 			}
 		}
 
-		final SimpleOnDragListener historyOnDragListener = new SimpleOnDragListener(new HistoryDragProcessor(), dragPreferences);
+		final SimpleOnDragListener historyOnDragListener = new SimpleOnDragListener(new HistoryDragProcessor<CalculatorHistoryState>(this.calculatorView), dragPreferences);
 		((DragButton) findViewById(R.id.historyButton)).setOnDragListener(historyOnDragListener);
 		onDragListeners.add(historyOnDragListener);
 
-		final SimpleOnDragListener toPositionOnDragListener = new SimpleOnDragListener(new SimpleOnDragListener.DragProcessor() {
+		final SimpleOnDragListener toPositionOnDragListener = new SimpleOnDragListener(new CursorDragProcessor(calculatorView), dragPreferences);
-			@Override
-			public boolean processDragEvent(@NotNull DragDirection dragDirection, @NotNull DragButton dragButton, @NotNull Point2d startPoint2d, @NotNull MotionEvent motionEvent) {
-				boolean result = false;
-
-				if (dragButton instanceof DirectionDragButton) {
-					String text = ((DirectionDragButton) dragButton).getText(dragDirection);
-					if ("↞".equals(text)) {
-						CalculatorActivity.this.view.setCursorOnStart();
-					} else if ("↠".equals(text)) {
-						CalculatorActivity.this.view.setCursorOnEnd();
-					}
-				}
-
-				return result;
-			}
-		}, dragPreferences);
 		((DragButton) findViewById(R.id.rightButton)).setOnDragListener(toPositionOnDragListener);
 		((DragButton) findViewById(R.id.leftButton)).setOnDragListener(toPositionOnDragListener);
 		onDragListeners.add(toPositionOnDragListener);
@@ -145,12 +123,12 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster {
 
 	@SuppressWarnings({"UnusedDeclaration"})
 	public void numericButtonClickHandler(@NotNull View v) {
-		this.view.evaluate();
+		this.calculatorView.evaluate();
 	}
 
 	@SuppressWarnings({"UnusedDeclaration"})
 	public void eraseButtonClickHandler(@NotNull View v) {
-		view.doTextOperation(new CalculatorView.TextOperation() {
+		calculatorView.doTextOperation(new CalculatorView.TextOperation() {
 			@Override
 			public void doOperation(@NotNull EditText editor) {
 				if (editor.getSelectionStart() > 0) {
@@ -167,17 +145,17 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster {
 
 	@SuppressWarnings({"UnusedDeclaration"})
 	public void moveLeftButtonClickHandler(@NotNull View v) {
-		view.moveCursorLeft();
+		calculatorView.moveCursorLeft();
 	}
 
 	@SuppressWarnings({"UnusedDeclaration"})
 	public void moveRightButtonClickHandler(@NotNull View v) {
-		view.moveCursorRight();
+		calculatorView.moveCursorRight();
 	}
 
 	@SuppressWarnings({"UnusedDeclaration"})
 	public void pasteButtonClickHandler(@NotNull View v) {
-		view.doTextOperation(new CalculatorView.TextOperation() {
+		calculatorView.doTextOperation(new CalculatorView.TextOperation() {
 			@Override
 			public void doOperation(@NotNull EditText editor) {
 				final ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
@@ -190,64 +168,19 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster {
 
 	@SuppressWarnings({"UnusedDeclaration"})
 	public void clearButtonClickHandler(@NotNull View v) {
-		view.clear();
+		calculatorView.clear();
 	}
 
 	@SuppressWarnings({"UnusedDeclaration"})
 	public void digitButtonClickHandler(@NotNull View v) {
-		view.processButtonAction(((DirectionDragButton) v).getTextMiddle());
+		Log.d(String.valueOf(v.getId()), "digitButtonClickHandler() for: " + v.getId() + ". Pressed: " + v.isPressed());
-	}
+		calculatorView.processDigitButtonAction(((DirectionDragButton) v).getTextMiddle());
-
-	private final class HistoryDragProcessor implements SimpleOnDragListener.DragProcessor {
-
-		@Override
-		public boolean processDragEvent(@NotNull DragDirection dragDirection, @NotNull DragButton dragButton, @NotNull Point2d startPoint2d, @NotNull MotionEvent motionEvent) {
-			boolean result = false;
-
-			Log.d(String.valueOf(dragButton.getId()), "History on drag event start: " + dragDirection);
-
-			assert dragButton instanceof DirectionDragButton;
-			String actionText = getActionText((DirectionDragButton) dragButton, dragDirection);
-			if (!StringUtils.isEmpty(actionText)) {
-				try {
-					result = true;
-
-					final HistoryAction historyAction = HistoryAction.valueOf(actionText);
-					view.doHistoryAction(historyAction);
-				} catch (IllegalArgumentException e) {
-					Log.e(String.valueOf(dragButton.getId()), "Unsupported history action: " + actionText);
-				}
-			}
-
-			return result;
-		}
-	}
-
-	@Nullable
-	private static String getActionText(@NotNull DirectionDragButton dragButton, @NotNull DragDirection direction) {
-		final String result;
-
-		switch (direction) {
-			case up:
-				result = dragButton.getTextUp();
-				break;
-
-			case down:
-				result = dragButton.getTextDown();
-				break;
-
-			default:
-				result = null;
-				break;
-		}
-
-		return result;
 	}
 
 	@Override
 	public boolean onKeyDown(int keyCode, KeyEvent event) {
 		if (keyCode == KeyEvent.KEYCODE_BACK) {
-			view.doHistoryAction(HistoryAction.undo);
+			calculatorView.doHistoryAction(HistoryAction.undo);
 			return true;
 		}
 		return super.onKeyDown(keyCode, event);

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

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
+package org.solovyev.android.calculator;
+
+import android.content.Context;
+import android.content.res.ColorStateList;
+import android.text.Html;
+import android.util.AttributeSet;
+import android.widget.EditText;
+import android.widget.TextView;
+import org.solovyev.common.definitions.Pair;
+import org.solovyev.common.exceptions.SersoException;
+import org.solovyev.common.utils.CollectionsUtils;
+import org.solovyev.util.math.MathEntityType;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Stack;
+
+/**
+ * User: serso
+ * Date: 9/17/11
+ * Time: 12:25 AM
+ */
+public class CalculatorEditText extends EditText {
+
+
+	public CalculatorEditText(Context context) {
+		super(context);
+	}
+
+	public CalculatorEditText(Context context, AttributeSet attrs) {
+		super(context, attrs);
+	}
+
+	public CalculatorEditText(Context context, AttributeSet attrs, int defStyle) {
+		super(context, attrs, defStyle);
+	}
+
+	@Override
+	public void setTextColor(ColorStateList colors) {
+		super.setTextColor(colors);	//To change body of overridden methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void setText(CharSequence text, BufferType type) {
+		/*try {
+			final List<Pair<Integer, Integer>> groupSymbols = new ArrayList<Pair<Integer, Integer>>();
+
+			final Stack<Pair<Integer, Integer>> groupSymbolsStack = new Stack<Pair<Integer, Integer>>();
+			for (int i = 0; i < text.length(); i++) {
+				char ch = text.charAt(i);
+				if (MathEntityType.openGroupSymbols.contains(ch)) {
+					groupSymbolsStack.push(new Pair<Integer, Integer>(i, null));
+				} else if (MathEntityType.closeGroupSymbols.contains(ch)) {
+					final Pair<Integer, Integer> pair = groupSymbolsStack.pop();
+					if (pair != null) {
+						pair.setSecond(i);
+						groupSymbols.add(0, pair);
+					} else {
+						throw new NoPairGroupSymbolException();
+					}
+				}
+			}
+
+			text = insertHtml(text, groupSymbols);
+		} catch (NoPairGroupSymbolException e) {
+			// do nothing
+		}*/
+
+		super.setText(text, type);
+	}
+
+	private class NoPairGroupSymbolException extends SersoException {
+
+	}
+}

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

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.calculator;
 
 import org.jetbrains.annotations.NotNull;

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

@@ -1,8 +1,16 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.calculator;
 
+import android.util.Log;
 import bsh.EvalError;
 import bsh.Interpreter;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.solovyev.common.exceptions.SersoException;
 import org.solovyev.common.utils.MathUtils;
 
 /**
@@ -24,19 +32,28 @@ public class CalculatorModel {
 		interpreter.eval(Preprocessor.wrap(JsclOperation.importCommands, "/jscl/editorengine/commands"));
 	}
 
-	public String evaluate(@NotNull JsclOperation operation, @NotNull String expression ) throws EvalError {
+	public String evaluate(@NotNull JsclOperation operation, @NotNull String expression ) throws EvalError, ParseException {
 
-		final String preprocessedString = Preprocessor.process(String.valueOf(expression));
+		final String preprocessedExpression = Preprocessor.process(expression);
 
-		String result = String.valueOf(interpreter.eval(Preprocessor.wrap(operation, preprocessedString))).trim();
+		Log.d(CalculatorModel.class.getName(), "Preprocessed expression: " + preprocessedExpression);
+
+		Object evaluationObject = interpreter.eval(Preprocessor.wrap(operation, preprocessedExpression));
+		String result = String.valueOf(evaluationObject).trim();
 
 		try {
 			final Double dResult = Double.valueOf(result);
 			result = String.valueOf(MathUtils.round(dResult, NUMBER_OF_FRACTION_DIGITS));
 		} catch (NumberFormatException e) {
-			// do nothing  => it's normal if sometimes we don't have doubles as result
+			throw new ParseException(e);
 		}
 
 		return result;
 	}
+
+	public static class ParseException extends SersoException {
+		public ParseException(Throwable cause) {
+			super(cause);
+		}
+	}
 }

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

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.calculator;
 
 import android.content.Intent;

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

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.calculator;
 
 import android.app.Activity;
@@ -5,6 +10,7 @@ import android.content.Context;
 import android.os.Handler;
 import android.text.ClipboardManager;
 import android.text.InputType;
+import android.util.Log;
 import android.view.View;
 import android.view.inputmethod.InputMethodManager;
 import android.widget.EditText;
@@ -13,6 +19,9 @@ import android.widget.Toast;
 import bsh.EvalError;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.solovyev.android.view.CursorControl;
+import org.solovyev.android.view.HistoryControl;
+import org.solovyev.common.math.calculators.Calculator;
 import org.solovyev.common.utils.MutableObject;
 import org.solovyev.common.utils.StringUtils;
 import org.solovyev.common.utils.history.HistoryAction;
@@ -25,10 +34,13 @@ import org.solovyev.util.math.MathEntityType;
  * Date: 9/12/11
  * Time: 11:15 PM
  */
-public class CalculatorView implements CursorControl{
+public class CalculatorView implements CursorControl, HistoryControl<CalculatorHistoryState> {
+
+	// millis to wait before evaluation after user edit action
+	public static final int EVAL_DELAY_MILLIS = 1000;
 
 	@NotNull
-	private final EditText editor;
+	private final CalculatorEditText editor;
 
 	@NotNull
 	private final TextView display;
@@ -37,18 +49,18 @@ public class CalculatorView implements CursorControl{
 	private final Activity activity;
 
 	@NotNull
-	private final CalculatorModel calculator;
+	private final CalculatorModel calculatorModel;
 
 	@NotNull
 	private HistoryHelper<CalculatorHistoryState> history;
 
 	public CalculatorView(@NotNull final Activity activity, @NotNull CalculatorModel calculator) {
 		this.activity = activity;
-		this.calculator = calculator;
+		this.calculatorModel = calculator;
 
 		final InputMethodManager imm = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
 
-		this.editor = (EditText) activity.findViewById(R.id.editText);
+		this.editor = (CalculatorEditText) activity.findViewById(R.id.editText);
 		this.editor.setInputType(InputType.TYPE_NULL);
 		imm.hideSoftInputFromWindow(this.editor.getWindowToken(), 0);
 
@@ -117,13 +129,14 @@ public class CalculatorView implements CursorControl{
 							if (history.isUndoAvailable()) {
 								history.undo(getCurrentHistoryState());
 							}
+
 							saveHistoryState();
 						}
 					}
 				}
 			});
 
-			new Handler().postDelayed(currentRunner.getObject(), 500);
+			new Handler().postDelayed(currentRunner.getObject(), EVAL_DELAY_MILLIS);
 
 			saveHistoryState();
 		}
@@ -136,14 +149,23 @@ public class CalculatorView implements CursorControl{
 			final Activity localActivity = activity;
 
 			try {
-				localDisplay.setText(calculator.evaluate(JsclOperation.numeric, expression));
+				Log.d(CalculatorView.class.getName(), "Trying to evaluate: " + expression);
-			} catch (EvalError evalError) {
+				localDisplay.setText(calculatorModel.evaluate(JsclOperation.numeric, expression));
+			} catch (EvalError e) {
+				handleEvaluationException(expression, showError, localDisplay, localActivity, e);
+			} catch (CalculatorModel.ParseException e) {
+				handleEvaluationException(expression, showError, localDisplay, localActivity, e);
+			}
+		}
+	}
+
+	private void handleEvaluationException(@NotNull String expression, boolean showError, @NotNull TextView localDisplay, @NotNull Activity localActivity, @NotNull Exception e) {
+		Log.d(CalculatorView.class.getName(), "Evaluation failed for : " + expression + ". Error message: " + e.getMessage());
+		localDisplay.setText("");
 		if (showError) {
 			Toast.makeText(localActivity, R.string.syntax_error, Toast.LENGTH_SHORT).show();
 		}
 	}
-		}
-	}
 
 	public void clear() {
 		if (!StringUtils.isEmpty(editor.getText()) || !StringUtils.isEmpty(editor.getText())) {
@@ -157,7 +179,7 @@ public class CalculatorView implements CursorControl{
 		evaluate(editor.getText().toString(), true);
 	}
 
-	public void processButtonAction(@Nullable final String text) {
+	public void processDigitButtonAction(@Nullable final String text) {
 		//Toast.makeText(CalculatorActivity.this, text, Toast.LENGTH_SHORT).show();
 
 		if (!StringUtils.isEmpty(text)) {
@@ -199,6 +221,7 @@ public class CalculatorView implements CursorControl{
 
 	}
 
+	@Override
 	public void doHistoryAction(@NotNull HistoryAction historyAction) {
 		if (history.isActionAvailable(historyAction)) {
 			final CalculatorHistoryState newState = history.doAction(historyAction, getCurrentHistoryState());
@@ -208,6 +231,7 @@ public class CalculatorView implements CursorControl{
 		}
 	}
 
+	@Override
 	public void setCurrentHistoryState(@NotNull CalculatorHistoryState editorHistoryState) {
 		setValuesFromHistory(this.editor, editorHistoryState.getEditorState());
 		setValuesFromHistory(this.display, editorHistoryState.getDisplayState());
@@ -220,6 +244,7 @@ public class CalculatorView implements CursorControl{
 		}
 	}
 
+	@Override
 	@NotNull
 	public CalculatorHistoryState getCurrentHistoryState() {
 		return new CalculatorHistoryState(getEditorHistoryState(this.editor), getEditorHistoryState(this.display));

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

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
+package org.solovyev.android.calculator;
+
+import android.view.MotionEvent;
+import org.jetbrains.annotations.NotNull;
+import org.solovyev.android.view.*;
+import org.solovyev.common.utils.Point2d;
+
+/**
+ * User: serso
+ * Date: 9/16/11
+ * Time: 11:45 PM
+ */
+public class CursorDragProcessor implements SimpleOnDragListener.DragProcessor{
+
+	@NotNull
+	private final CursorControl cursorControl;
+
+	public CursorDragProcessor(@NotNull CursorControl cursorControl) {
+		this.cursorControl = cursorControl;
+	}
+
+	@Override
+	public boolean processDragEvent(@NotNull DragDirection dragDirection, @NotNull DragButton dragButton, @NotNull Point2d startPoint2d, @NotNull MotionEvent motionEvent) {
+		boolean result = false;
+
+		if (dragButton instanceof DirectionDragButton) {
+			String text = ((DirectionDragButton) dragButton).getText(dragDirection);
+			if ("↞".equals(text)) {
+				cursorControl.setCursorOnStart();
+			} else if ("↠".equals(text)) {
+				cursorControl.setCursorOnEnd();
+			}
+		}
+
+		return result;
+	}
+}

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

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
+package org.solovyev.android.calculator;
+
+import android.view.MotionEvent;
+import org.jetbrains.annotations.NotNull;
+import org.solovyev.android.view.DirectionDragButton;
+import org.solovyev.android.view.DragButton;
+import org.solovyev.android.view.DragDirection;
+import org.solovyev.android.view.SimpleOnDragListener;
+import org.solovyev.common.utils.Point2d;
+
+/**
+ * User: serso
+ * Date: 9/16/11
+ * Time: 11:48 PM
+ */
+public class DigitButtonDragProcessor implements SimpleOnDragListener.DragProcessor {
+
+	@NotNull
+	private final CalculatorView calculatorView;
+
+	public DigitButtonDragProcessor(@NotNull CalculatorView calculatorView) {
+		this.calculatorView = calculatorView;
+	}
+
+	@Override
+	public boolean processDragEvent(@NotNull DragDirection dragDirection, @NotNull DragButton dragButton, @NotNull Point2d startPoint2d, @NotNull MotionEvent motionEvent) {
+		assert dragButton instanceof DirectionDragButton;
+		calculatorView.processDigitButtonAction(((DirectionDragButton) dragButton).getDirectionText(dragDirection));
+		return true;
+	}
+
+}

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

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.calculator;
 
 import android.app.Activity;
@@ -203,20 +208,20 @@ public class DragButtonCalibrationActivity extends Activity {
 					case angle:
 						switch (dragDirection) {
 							case up:
-								defaultMin = 150f;
+								defaultMin = 130f;
 								defaultMax = 180f;
 								break;
 							case down:
 								defaultMin = 0f;
-								defaultMax = 30f;
+								defaultMax = 50f;
 								break;
 							default:
-								defaultMin = DEFAULT_VALUE;
+								defaultMin = 0;
-								defaultMax = DEFAULT_VALUE;
+								defaultMax = 0;
 						}
 						break;
 					case distance:
-						defaultMin = 50f;
+						defaultMin = 10f;
 						defaultMax = 150f;
 						break;
 					case duration:

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

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.calculator;
 
 import org.jetbrains.annotations.Nullable;

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

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
+package org.solovyev.android.calculator;
+
+import android.app.Activity;
+
+/**
+ * User: serso
+ * Date: 9/16/11
+ * Time: 11:52 PM
+ */
+public class HelpActivity extends Activity {
+	// todo serso: implement
+}

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

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.calculator;
 
 public enum JsclOperation {

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

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.calculator;
 
 import org.jetbrains.annotations.NotNull;
@@ -57,9 +62,12 @@ public class Preprocessor {
 
 			if (mathTypeBefore != MathEntityType.binary_operation &&
 					mathTypeBefore != MathEntityType.unary_operation &&
+						mathTypeBefore != MathEntityType.function &&
 							!MathEntityType.openGroupSymbols.contains(chBefore)) {
 
-				if (mathType == MathEntityType.constant || MathEntityType.openGroupSymbols.contains(ch)) {
+				if (mathType == MathEntityType.constant ) {
+					sb.append("*");
+				} else if ( MathEntityType.openGroupSymbols.contains(ch) && mathTypeBefore != null ) {
 					sb.append("*");
 				} else if (mathType == MathEntityType.digit && mathTypeBefore != MathEntityType.digit && mathTypeBefore != MathEntityType.dot) {
 					sb.append("*");

src/main/java/org/solovyev/android/view/ColorButton.java

@@ -14,6 +14,11 @@
  * limitations under the License.
  */
 
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.view;
 
 import android.content.Context;
@@ -102,7 +107,7 @@ public class ColorButton extends Button {
 		measureText();
 	}
 
-	private void drawMagicFlame(int duration, Canvas canvas) {
+	public void drawMagicFlame(int duration, Canvas canvas) {
 		int alpha = 255 - 255 * duration / CLICK_FEEDBACK_DURATION;
 		int color = CLICK_FEEDBACK_COLOR | (alpha << 24);
 
@@ -121,8 +126,6 @@ public class ColorButton extends Button {
 				drawMagicFlame(animDuration, canvas);
 				postInvalidateDelayed(CLICK_FEEDBACK_INTERVAL);
 			}
-		} else if (isPressed()) {
-			drawMagicFlame(0, canvas);
 		}
 
 		CharSequence text = getText();

src/main/java/org/solovyev/android/view/CursorControl.java

@@ -1,4 +1,9 @@
-package org.solovyev.android.calculator;
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
+package org.solovyev.android.view;
 
 /**
  * User: serso

src/main/java/org/solovyev/android/view/DirectionDragButton.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.view;
 
 import android.content.Context;
@@ -41,6 +46,27 @@ public class DirectionDragButton extends DragButton {
 		init(context, attrs);
 	}
 
+	@Nullable
+	public String getDirectionText(@NotNull DragDirection direction) {
+		final String result;
+
+		switch (direction) {
+			case up:
+				result = this.getTextUp();
+				break;
+
+			case down:
+				result = this.getTextDown();
+				break;
+
+			default:
+				result = null;
+				break;
+		}
+
+		return result;
+	}
+
 
 	private void init(@NotNull Context context, @NotNull AttributeSet attrs) {
 

src/main/java/org/solovyev/android/view/DragButton.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.view;
 
 import android.content.Context;
@@ -76,11 +81,10 @@ public class DragButton extends ColorButton {
 							if (localOnDragListener.isSuppressOnClickEvent()) {
 								// prevent on click action
 								setPressed(false);
-							}
-
 
+								// sometimes setPressed(false); doesn't work so to prevent onClick action button disables
 								if (v instanceof Button) {
-								final Button button = (Button)v;
+									final Button button = (Button) v;
 
 									button.setEnabled(false);
 
@@ -88,7 +92,8 @@ public class DragButton extends ColorButton {
 										public void run() {
 											button.setEnabled(true);
 										}
-								}, 500);
+									}, 300);
+								}
 							}
 						}
 

src/main/java/org/solovyev/android/view/DragDirection.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.view;
 
 public enum DragDirection {

src/main/java/org/solovyev/android/view/DragEvent.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.view;
 
 import android.view.MotionEvent;

src/main/java/org/solovyev/android/view/FontSizeAdjuster.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.view;
 
 import android.widget.TextView;

src/main/java/org/solovyev/android/view/HistoryControl.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
+package org.solovyev.android.view;
+
+import org.jetbrains.annotations.NotNull;
+import org.solovyev.common.utils.history.HistoryAction;
+
+/**
+ * User: serso
+ * Date: 9/16/11
+ * Time: 11:42 PM
+ */
+public interface HistoryControl<T> {
+
+	void doHistoryAction(@NotNull HistoryAction historyAction);
+
+	void setCurrentHistoryState(@NotNull T editorHistoryState);
+
+	@NotNull
+	T getCurrentHistoryState();
+}

src/main/java/org/solovyev/android/view/HistoryDragProcessor.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
+package org.solovyev.android.view;
+
+import android.util.Log;
+import android.view.MotionEvent;
+import org.jetbrains.annotations.NotNull;
+import org.solovyev.android.view.*;
+import org.solovyev.common.utils.Point2d;
+import org.solovyev.common.utils.StringUtils;
+import org.solovyev.common.utils.history.HistoryAction;
+
+/**
+* User: serso
+* Date: 9/16/11
+* Time: 11:36 PM
+*/
+public class HistoryDragProcessor<T> implements SimpleOnDragListener.DragProcessor {
+
+	@NotNull
+	private final HistoryControl<T> historyControl;
+
+	public HistoryDragProcessor(@NotNull HistoryControl<T> historyControl) {
+		this.historyControl = historyControl;
+	}
+
+	@Override
+	public boolean processDragEvent(@NotNull DragDirection dragDirection, @NotNull DragButton dragButton, @NotNull Point2d startPoint2d, @NotNull MotionEvent motionEvent) {
+		boolean result = false;
+
+		Log.d(String.valueOf(dragButton.getId()), "History on drag event start: " + dragDirection);
+
+		assert dragButton instanceof DirectionDragButton;
+		String actionText = ((DirectionDragButton) dragButton).getDirectionText(dragDirection);
+		if (!StringUtils.isEmpty(actionText)) {
+			try {
+				result = true;
+
+				final HistoryAction historyAction = HistoryAction.valueOf(actionText);
+				historyControl.doHistoryAction(historyAction);
+			} catch (IllegalArgumentException e) {
+				Log.e(String.valueOf(dragButton.getId()), "Unsupported history action: " + actionText);
+			}
+		}
+
+		return result;
+	}
+}

src/main/java/org/solovyev/android/view/OnDragListener.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.view;
 
 import org.jetbrains.annotations.NotNull;

src/main/java/org/solovyev/android/view/SimpleOnDragListener.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.android.view;
 
 import android.util.Log;

src/main/java/org/solovyev/util/math/MathEntity.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.util.math;
 
 import org.jetbrains.annotations.NotNull;

src/main/java/org/solovyev/util/math/MathEntityType.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+ * For more information, please, contact se.solovyev@gmail.com
+ */
+
 package org.solovyev.util.math;
 
 import java.util.ArrayList;
@@ -48,7 +53,24 @@ public enum MathEntityType {
 		MathEntityType result = null;
 		
 		if ( s.length() == 1 ) {
-			char ch = s.charAt(0);
+			result = getType(s.charAt(0));
+		}
+		
+		if ( result == null ) {
+			if ( functions.contains(s) ) {
+				result = MathEntityType.function;
+			} else if ( groupSymbols.contains(s) ) {
+				result = MathEntityType.group_symbols;
+			}
+		}
+		
+		
+		return result;
+	}
+
+	@Nullable
+	public static MathEntityType getType(char ch) {
+		MathEntityType result = null;
 
 		if ( Character.isDigit(ch) ) {
 			result = MathEntityType.digit;
@@ -63,17 +85,6 @@ public enum MathEntityType {
 		} else if ( dots.contains(ch) ) {
 			result = MathEntityType.dot;
 		}
-		}
-		
-		if ( result == null ) {
-			if ( functions.contains(s) ) {
-				result = MathEntityType.function;
-			} else if ( groupSymbols.contains(s) ) {
-				result = MathEntityType.group_symbols;
-			}
-		}
-		
-		
 		return result;
 	}
 }