cpp-130: Make drag buttons more usable

The maximum distance of detecting dragging was removed.
The minimum distance now uses DPI value.

Fixes #130

android-app/src/main/java/org/solovyev/android/calculator/BaseUi.java

@@ -41,8 +41,6 @@ import org.solovyev.android.calculator.view.AngleUnitsButton;
 import org.solovyev.android.calculator.view.DragListenerVibrator;
 import org.solovyev.android.calculator.view.NumeralBasesButton;
 import org.solovyev.android.calculator.view.ViewsCache;
-import org.solovyev.common.listeners.JListeners;
-import org.solovyev.common.listeners.Listeners;
 import org.solovyev.common.math.Point2d;
 
 import javax.annotation.Nonnull;
@@ -83,9 +81,6 @@ public abstract class BaseUi implements SharedPreferences.OnSharedPreferenceChan
 	@Nullable
 	private NumeralBasesButton clearButton;
 
-	@Nonnull
-	private final JListeners<DragPreferencesChangeListener> dpclRegister = Listeners.newHardRefListeners();
-
 	protected BaseUi() {
 	}
 
@@ -140,36 +135,24 @@ public abstract class BaseUi implements SharedPreferences.OnSharedPreferenceChan
 	}
 
 	public void processButtons(@Nonnull final Activity activity, @Nonnull View root) {
-		dpclRegister.removeListeners();
-
 		final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(activity);
-		final SimpleDragListener.Preferences dragPreferences = SimpleDragListener.getPreferences(preferences, activity);
 
 		final ViewsCache views = ViewsCache.forView(root);
-		setOnDragListeners(views, dragPreferences, preferences);
+		setOnDragListeners(views, preferences, activity);
 
 		HistoryDragProcessor<CalculatorHistoryState> historyDragProcessor = new HistoryDragProcessor<>(getCalculator());
-		final DragListener historyDragListener = new DragListenerVibrator(newOnDragListener(historyDragProcessor, dragPreferences), vibrator, preferences);
+		final DragListener historyDragListener = new DragListenerVibrator(newDragListener(historyDragProcessor, activity), vibrator, preferences);
 		final DragButton historyButton = getButton(views, R.id.cpp_button_history);
 		if (historyButton != null) {
 			historyButton.setOnDragListener(historyDragListener);
 		}
 
-		final DragButton subtractionButton = getButton(views, R.id.cpp_button_subtraction);
+		final DragButton minusButton = getButton(views, R.id.cpp_button_subtraction);
-		if (subtractionButton != null) {
+		if (minusButton != null) {
-			subtractionButton.setOnDragListener(new DragListenerVibrator(newOnDragListener(new SimpleDragListener.DragProcessor() {
+			minusButton.setOnDragListener(new DragListenerVibrator(newDragListener(new MinusButtonDragProcessor(), activity), vibrator, preferences));
-				@Override
-				public boolean processDragEvent(@Nonnull DragDirection dragDirection, @Nonnull DragButton dragButton, @Nonnull Point2d startPoint2d, @Nonnull MotionEvent motionEvent) {
-					if (dragDirection == DragDirection.down) {
-						Locator.getInstance().getCalculator().fireCalculatorEvent(CalculatorEventType.show_operators, null);
-						return true;
-					}
-					return false;
-				}
-			}, dragPreferences), vibrator, preferences));
 		}
 
-		final DragListener toPositionDragListener = new DragListenerVibrator(new SimpleDragListener(new CursorDragProcessor(), dragPreferences), vibrator, preferences);
+		final DragListener toPositionDragListener = new DragListenerVibrator(new SimpleDragListener(new CursorDragProcessor(), activity), vibrator, preferences);
 
 		final DragButton rightButton = getButton(views, R.id.cpp_button_right);
 		if (rightButton != null) {
@@ -183,32 +166,32 @@ public abstract class BaseUi implements SharedPreferences.OnSharedPreferenceChan
 
 		final DragButton equalsButton = getButton(views, R.id.cpp_button_equals);
 		if (equalsButton != null) {
-			equalsButton.setOnDragListener(new DragListenerVibrator(newOnDragListener(new EqualsDragProcessor(), dragPreferences), vibrator, preferences));
+			equalsButton.setOnDragListener(new DragListenerVibrator(newDragListener(new EqualsDragProcessor(), activity), vibrator, preferences));
 		}
 
 		angleUnitsButton = getButton(views, R.id.cpp_button_6);
 		if (angleUnitsButton != null) {
-			angleUnitsButton.setOnDragListener(new DragListenerVibrator(newOnDragListener(new CalculatorButtons.AngleUnitsChanger(activity), dragPreferences), vibrator, preferences));
+			angleUnitsButton.setOnDragListener(new DragListenerVibrator(newDragListener(new CalculatorButtons.AngleUnitsChanger(activity), activity), vibrator, preferences));
 		}
 
 		clearButton = getButton(views, R.id.cpp_button_clear);
 		if (clearButton != null) {
-			clearButton.setOnDragListener(new DragListenerVibrator(newOnDragListener(new CalculatorButtons.NumeralBasesChanger(activity), dragPreferences), vibrator, preferences));
+			clearButton.setOnDragListener(new DragListenerVibrator(newDragListener(new CalculatorButtons.NumeralBasesChanger(activity), activity), vibrator, preferences));
 		}
 
 		final DragButton varsButton = getButton(views, R.id.cpp_button_vars);
 		if (varsButton != null) {
-			varsButton.setOnDragListener(new DragListenerVibrator(newOnDragListener(new CalculatorButtons.VarsDragProcessor(activity), dragPreferences), vibrator, preferences));
+			varsButton.setOnDragListener(new DragListenerVibrator(newDragListener(new CalculatorButtons.VarsDragProcessor(activity), activity), vibrator, preferences));
 		}
 
 		final DragButton functionsButton = getButton(views, R.id.cpp_button_functions);
 		if (functionsButton != null) {
-			functionsButton.setOnDragListener(new DragListenerVibrator(newOnDragListener(new CalculatorButtons.FunctionsDragProcessor(activity), dragPreferences), vibrator, preferences));
+			functionsButton.setOnDragListener(new DragListenerVibrator(newDragListener(new CalculatorButtons.FunctionsDragProcessor(activity), activity), vibrator, preferences));
 		}
 
 		final DragButton roundBracketsButton = getButton(views, R.id.cpp_button_round_brackets);
 		if (roundBracketsButton != null) {
-			roundBracketsButton.setOnDragListener(new DragListenerVibrator(newOnDragListener(new CalculatorButtons.RoundBracketsDragProcessor(), dragPreferences), vibrator, preferences));
+			roundBracketsButton.setOnDragListener(new DragListenerVibrator(newDragListener(new CalculatorButtons.RoundBracketsDragProcessor(), activity), vibrator, preferences));
 		}
 
 		if (layout == simple || layout == simple_mobile) {
@@ -239,8 +222,8 @@ public abstract class BaseUi implements SharedPreferences.OnSharedPreferenceChan
 		new ButtonOnClickListener().attachToViews(views);
 	}
 
-	private void setOnDragListeners(@Nonnull ViewsCache views, @Nonnull SimpleDragListener.Preferences dragPreferences, @Nonnull SharedPreferences preferences) {
+	private void setOnDragListeners(@Nonnull ViewsCache views, @Nonnull SharedPreferences preferences, @Nonnull Context context) {
-		final DragListener dragListener = new DragListenerVibrator(newOnDragListener(new DigitButtonDragProcessor(getKeyboard()), dragPreferences), vibrator, preferences);
+		final DragListener dragListener = new DragListenerVibrator(newDragListener(new DigitButtonDragProcessor(getKeyboard()), context), vibrator, preferences);
 
 		final List<Integer> viewIds = getViewIds();
 		for (Integer viewId : viewIds) {
@@ -252,11 +235,8 @@ public abstract class BaseUi implements SharedPreferences.OnSharedPreferenceChan
 	}
 
 	@Nonnull
-	private SimpleDragListener newOnDragListener(@Nonnull SimpleDragListener.DragProcessor dragProcessor,
+	private SimpleDragListener newDragListener(@Nonnull SimpleDragListener.DragProcessor dragProcessor, @Nonnull Context context) {
-												 @Nonnull SimpleDragListener.Preferences dragPreferences) {
+		return new SimpleDragListener(dragProcessor, context);
-		final SimpleDragListener onDragListener = new SimpleDragListener(dragProcessor, dragPreferences);
-		dpclRegister.addListener(onDragListener);
-		return onDragListener;
 	}
 
 	private void toggleButtonDirectionText(@Nonnull ViewsCache views, int id, boolean showDirectionText, @Nonnull DragDirection... dragDirections) {
@@ -328,4 +308,15 @@ public abstract class BaseUi implements SharedPreferences.OnSharedPreferenceChan
 			}
 		}
 	}
+
+	private static class MinusButtonDragProcessor implements SimpleDragListener.DragProcessor {
+		@Override
+		public boolean processDragEvent(@Nonnull DragDirection dragDirection, @Nonnull DragButton dragButton, @Nonnull Point2d startPoint2d, @Nonnull MotionEvent motionEvent) {
+			if (dragDirection == DragDirection.down) {
+				Locator.getInstance().getCalculator().fireCalculatorEvent(CalculatorEventType.show_operators, null);
+				return true;
+			}
+			return false;
+		}
+	}
 }

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

@@ -48,7 +48,8 @@ public class DigitButtonDragProcessor implements SimpleDragListener.DragProcesso
 	@Override
 	public boolean processDragEvent(@Nonnull DragDirection dragDirection, @Nonnull DragButton dragButton, @Nonnull Point2d startPoint2d, @Nonnull MotionEvent motionEvent) {
 		if (!(dragButton instanceof DirectionDragButton)) throw new AssertionError();
-		calculatorKeyboard.buttonPressed(((DirectionDragButton) dragButton).getText(dragDirection));
+		final String text = ((DirectionDragButton) dragButton).getText(dragDirection);
+		calculatorKeyboard.buttonPressed(text);
 		return true;
 	}
 

android-app/src/main/java/org/solovyev/android/calculator/drag/DirectionDragButton.java

@@ -398,7 +398,7 @@ public class DirectionDragButton extends DragButton {
 	private Map<GuiDragDirection, Float> getDirectionTextScales() {
 		final List<Float> scales = StringCollections.split(getDirectionTextScale(), ";", NumberParser.of(Float.class));
 
-		final Map<GuiDragDirection, Float> result = new HashMap<GuiDragDirection, Float>();
+		final Map<GuiDragDirection, Float> result = new HashMap<>();
 		for (GuiDragDirection direction : GuiDragDirection.values()) {
 			result.put(direction, DEFAULT_DIRECTION_TEXT_SCALE_FLOAT);
 		}

android-app/src/main/java/org/solovyev/android/calculator/drag/DragButton.java

@@ -67,8 +67,6 @@ public class DragButton extends Button {
 		if (localOnDragListener != null) {
 			// only if onDrag() listener specified
 
-			Log.d(String.valueOf(getId()), "onTouch() for: " + getId() + " . Motion event: " + event);
-
 			switch (event.getAction()) {
 				case MotionEvent.ACTION_DOWN:
 					// start tracking: set start point

android-app/src/main/java/org/solovyev/android/calculator/drag/DragPreferencesChangeListener.java

@@ -1,36 +0,0 @@
-/*
- * Copyright 2013 serso aka se.solovyev
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- * Contact details
- *
- * Email: se.solovyev@gmail.com
- * Site:  http://se.solovyev.org
- */
-
-package org.solovyev.android.calculator.drag;
-
-import javax.annotation.Nonnull;
-import java.util.EventListener;
-
-/**
- * User: serso
- * Date: 9/18/11
- * Time: 8:48 PM
- */
-public interface DragPreferencesChangeListener extends EventListener {
-
-	void onDragPreferencesChange(@Nonnull SimpleDragListener.Preferences preferences);
-}

android-app/src/main/java/org/solovyev/android/calculator/drag/SimpleDragListener.java

@@ -23,99 +23,81 @@
 package org.solovyev.android.calculator.drag;
 
 import android.content.Context;
-import android.content.SharedPreferences;
+import android.support.v4.view.ViewConfigurationCompat;
-import android.util.Log;
 import android.view.MotionEvent;
+import android.view.ViewConfiguration;
+
+import org.solovyev.android.calculator.R;
 import org.solovyev.common.MutableObject;
 import org.solovyev.common.interval.Interval;
 import org.solovyev.common.interval.Intervals;
 import org.solovyev.common.math.Maths;
 import org.solovyev.common.math.Point2d;
-import org.solovyev.common.text.Mapper;
-import org.solovyev.common.text.NumberIntervalMapper;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
-import java.util.HashMap;
-import java.util.Map;
 
-public class SimpleDragListener implements DragListener, DragPreferencesChangeListener {
+import java.util.EnumMap;
+
+public class SimpleDragListener implements DragListener {
 
 	@Nonnull
-	public static final Point2d axis = new Point2d(0, 1);
+	private static final Point2d axis = new Point2d(0, 1);
 
 	@Nonnull
-	private DragProcessor dragProcessor;
+	private static final EnumMap<DragDirection, Interval<Float>> sAngleIntervals = new EnumMap<>(DragDirection.class);
+
+	static {
+		for (DragDirection direction : DragDirection.values()) {
+			sAngleIntervals.put(direction, makeAngleInterval(direction, 0, 45));
+		}
+	}
 
 	@Nonnull
-	private Preferences preferences;
+	private final DragProcessor processor;
 
-	public SimpleDragListener(@Nonnull DragProcessor dragProcessor, @Nonnull Preferences preferences) {
+	private final float minDistancePxs;
-		this.dragProcessor = dragProcessor;
+
-		this.preferences = preferences;
+	public SimpleDragListener(@Nonnull DragProcessor processor, @Nonnull Context context) {
+		this.processor = processor;
+		this.minDistancePxs = context.getResources().getDimensionPixelSize(R.dimen.cpp_min_drag_distance);
 	}
 
 	@Override
 	public boolean onDrag(@Nonnull DragButton dragButton, @Nonnull DragEvent event) {
-		boolean result = false;
+		boolean consumed = false;
 
-		logDragEvent(dragButton, event);
-
-		final Point2d startPoint = event.getStartPoint();
 		final MotionEvent motionEvent = event.getMotionEvent();
 
-		// init end point
+		final Point2d start = event.getStartPoint();
-		final Point2d endPoint = new Point2d(motionEvent.getX(), motionEvent.getY());
+		final Point2d end = new Point2d(motionEvent.getX(), motionEvent.getY());
+		final float distance = Maths.getDistance(start, end);
 
-		final float distance = Maths.getDistance(startPoint, endPoint);
+		final MutableObject<Boolean> right = new MutableObject<>();
+		final double angle = Math.toDegrees(Maths.getAngle(start, Maths.sum(start, axis), end, right));
 
-		final MutableObject<Boolean> right = new MutableObject<Boolean>();
+		final long duration = motionEvent.getEventTime() - motionEvent.getDownTime();
-		final double angle = Math.toDegrees(Maths.getAngle(startPoint, Maths.sum(startPoint, axis), endPoint, right));
+		final DragDirection direction = getDirection(distance, (float) angle, right.getObject());
-		Log.d(String.valueOf(dragButton.getId()), "Angle: " + angle);
+		if (direction != null && duration > 40 && duration < 2500) {
-		Log.d(String.valueOf(dragButton.getId()), "Is right?: " + right.getObject());
+			consumed = processor.processDragEvent(direction, dragButton, start, motionEvent);
+		}
 
-		final double duration = motionEvent.getEventTime() - motionEvent.getDownTime();
+		return consumed;
+	}
 
-		final Preference distancePreferences = preferences.getPreferencesMap().get(PreferenceType.distance);
+	@Nullable
-		final Preference anglePreferences = preferences.getPreferencesMap().get(PreferenceType.angle);
+	private DragDirection getDirection(float distance, float angle, boolean right) {
-
+		if (distance > minDistancePxs) {
-		DragDirection direction = null;
+			for (DragDirection direction : DragDirection.values()) {
-		for (Map.Entry<DragDirection, DragPreference> directionEntry : distancePreferences.getDirectionPreferences().entrySet()) {
+				final Interval<Float> angleInterval = sAngleIntervals.get(direction);
-
+				final boolean wrongDirection = (direction == DragDirection.left && right) ||
-			Log.d(String.valueOf(dragButton.getId()), "Drag direction: " + directionEntry.getKey());
+						(direction == DragDirection.right && !right);
-			Log.d(String.valueOf(dragButton.getId()), "Trying direction interval: " + directionEntry.getValue().getInterval());
+				if (!wrongDirection && angleInterval.contains(angle)) {
-
+					return direction;
-			if (directionEntry.getValue().getInterval().contains(distance)) {
-				final DragPreference anglePreference = anglePreferences.getDirectionPreferences().get(directionEntry.getKey());
-
-				Log.d(String.valueOf(dragButton.getId()), "Trying angle interval: " + anglePreference.getInterval());
-
-				if (directionEntry.getKey() == DragDirection.left && right.getObject()) {
-				} else if (directionEntry.getKey() == DragDirection.right && !right.getObject()) {
-				} else {
-					if (anglePreference.getInterval().contains((float) angle)) {
-						direction = directionEntry.getKey();
-						Log.d(String.valueOf(dragButton.getId()), "MATCH! Direction: " + direction);
-						break;
 				}
 			}
 		}
-
+		return null;
-		}
-
-		if (direction != null) {
-			final Preference durationPreferences = preferences.getPreferencesMap().get(PreferenceType.duration);
-
-			final DragPreference durationDragPreferences = durationPreferences.getDirectionPreferences().get(direction);
-
-			Log.d(String.valueOf(dragButton.getId()), "Trying time interval: " + durationDragPreferences.getInterval());
-			if (durationDragPreferences.getInterval().contains((float) duration)) {
-				Log.d(String.valueOf(dragButton.getId()), "MATCH!");
-				result = dragProcessor.processDragEvent(direction, dragButton, startPoint, motionEvent);
-			}
-		}
-
-		return result;
 	}
 
 	@Override
@@ -123,173 +105,38 @@ public class SimpleDragListener implements DragListener, DragPreferencesChangeLi
 		return true;
 	}
 
-	private void logDragEvent(@Nonnull DragButton dragButton, @Nonnull DragEvent event) {
-		final Point2d startPoint = event.getStartPoint();
-		final MotionEvent motionEvent = event.getMotionEvent();
-		final Point2d endPoint = new Point2d(motionEvent.getX(), motionEvent.getY());
-
-		Log.d(String.valueOf(dragButton.getId()), "Start point: " + startPoint + ", End point: " + endPoint);
-		Log.d(String.valueOf(dragButton.getId()), "Distance: " + Maths.getDistance(startPoint, endPoint));
-		final MutableObject<Boolean> right = new MutableObject<Boolean>();
-		Log.d(String.valueOf(dragButton.getId()), "Angle: " + Math.toDegrees(Maths.getAngle(startPoint, Maths.sum(startPoint, axis), endPoint, right)));
-		Log.d(String.valueOf(dragButton.getId()), "Is right angle? " + right);
-		Log.d(String.valueOf(dragButton.getId()), "Axis: " + axis + " Vector: " + Maths.subtract(endPoint, startPoint));
-		Log.d(String.valueOf(dragButton.getId()), "Total time: " + (motionEvent.getEventTime() - motionEvent.getDownTime()) + " ms");
-	}
-
-	@Override
-	public void onDragPreferencesChange(@Nonnull Preferences preferences) {
-		this.preferences = preferences;
-	}
-
 	public interface DragProcessor {
 
 		boolean processDragEvent(@Nonnull DragDirection dragDirection, @Nonnull DragButton dragButton, @Nonnull Point2d startPoint2d, @Nonnull MotionEvent motionEvent);
 	}
 
-	// todo serso: currently we do not use direction
-	public static String getPreferenceId(@Nonnull PreferenceType preferenceType, @Nonnull DragDirection direction) {
-		return "org.solovyev.android.calculator.DragButtonCalibrationActivity" + "_" + preferenceType.name() /*+ "_" + direction.name()*/;
-	}
-
 	@Nonnull
-	public static Preferences getDefaultPreferences(@Nonnull Context context) {
+	private static Interval<Float> makeAngleInterval(@Nonnull DragDirection direction,
-		return getPreferences0(null, context);
+													 float leftLimit,
-	}
+													 float rightLimit) {
-
-	@Nonnull
-	public static Preferences getPreferences(@Nonnull final SharedPreferences preferences, @Nonnull Context context) {
-		return getPreferences0(preferences, context);
-	}
-
-	@Nonnull
-	private static Preferences getPreferences0(@Nullable final SharedPreferences preferences, @Nonnull Context context) {
-
-		final Mapper<Interval<Float>> mapper = NumberIntervalMapper.of(Float.class);
-
-		final Preferences result = new Preferences();
-
-		for (PreferenceType preferenceType : PreferenceType.values()) {
-			for (DragDirection dragDirection : DragDirection.values()) {
-
-				final String preferenceId = getPreferenceId(preferenceType, dragDirection);
-
-				final String defaultValue;
-				switch (preferenceType) {
-					case angle:
-						defaultValue = context.getResources().getString(org.solovyev.android.view.R.string.p_drag_angle);
-						break;
-					case distance:
-						defaultValue = context.getResources().getString(org.solovyev.android.view.R.string.p_drag_distance);
-						break;
-					case duration:
-						defaultValue = context.getResources().getString(org.solovyev.android.view.R.string.p_drag_duration);
-						break;
-					default:
-						defaultValue = null;
-						Log.e(SimpleDragListener.class.getName(), "New preference type added: default preferences should be defined. Preference id: " + preferenceId);
-				}
-
-				final String value = preferences == null ? defaultValue : preferences.getString(preferenceId, defaultValue);
-
-				if (value != null) {
-					final Interval<Float> intervalPref = transformInterval(preferenceType, dragDirection, mapper.parseValue(value));
-
-					Log.d(SimpleDragListener.class.getName(), "Preference loaded for " + dragDirection + ". Id: " + preferenceId + ", value: " + intervalPref.toString());
-
-					final DragPreference directionPreference = new DragPreference(intervalPref);
-
-					Preference preference = result.getPreferencesMap().get(preferenceType);
-					if (preference == null) {
-						preference = new Preference();
-						result.getPreferencesMap().put(preferenceType, preference);
-					}
-
-					preference.getDirectionPreferences().put(dragDirection, directionPreference);
-				}
-			}
-		}
-
-		return result;
-	}
-
-	@Nonnull
-	public static Interval<Float> transformInterval(@Nonnull PreferenceType preferenceType,
-													@Nonnull DragDirection dragDirection,
-													@Nonnull Interval<Float> interval) {
-
-		if (preferenceType == PreferenceType.angle) {
-			final Float leftLimit = interval.getLeftLimit();
-			final Float rightLimit = interval.getRightLimit();
-
-			if (leftLimit != null && rightLimit != null) {
 		final Float newLeftLimit;
 		final Float newRightLimit;
-
+		switch (direction) {
-				if (dragDirection == DragDirection.up) {
+			case up:
 				newLeftLimit = 180f - rightLimit;
 				newRightLimit = 180f - leftLimit;
-				} else if (dragDirection == DragDirection.left) {
+				break;
-					newLeftLimit = 90f - rightLimit;
+			case down:
-					newRightLimit = 90f + rightLimit;
-				} else if (dragDirection == DragDirection.right) {
-					newLeftLimit = 90f - rightLimit;
-					newRightLimit = 90f + rightLimit;
-				} else {
 				newLeftLimit = leftLimit;
 				newRightLimit = rightLimit;
+				break;
+			case left:
+				newLeftLimit = 90f - rightLimit;
+				newRightLimit = 90f + rightLimit;
+				break;
+			case right:
+				newLeftLimit = 90f - rightLimit;
+				newRightLimit = 90f + rightLimit;
+				break;
+			default:
+				throw new AssertionError();
 		}
 
 		return Intervals.newClosedInterval(newLeftLimit, newRightLimit);
 	}
 }
-
-		return interval;
-	}
-
-
-	public static enum PreferenceType {
-		angle,
-		distance,
-		duration
-	}
-
-	public static class DragPreference {
-
-		@Nonnull
-		private Interval<Float> interval;
-
-
-		public DragPreference(@Nonnull Interval<Float> interval) {
-			this.interval = interval;
-		}
-
-		@Nonnull
-		public Interval<Float> getInterval() {
-			return interval;
-		}
-
-	}
-
-	public static class Preference {
-
-		@Nonnull
-		private Map<DragDirection, DragPreference> directionPreferences = new HashMap<DragDirection, DragPreference>();
-
-
-		@Nonnull
-		public Map<DragDirection, DragPreference> getDirectionPreferences() {
-			return directionPreferences;
-		}
-
-	}
-
-	public static class Preferences {
-
-		private final Map<PreferenceType, Preference> preferencesMap = new HashMap<>();
-
-		public Map<PreferenceType, Preference> getPreferencesMap() {
-			return preferencesMap;
-		}
-	}
-}

android-app/src/main/java/org/solovyev/android/calculator/view/DragListenerVibrator.java

@@ -54,12 +54,12 @@ public class DragListenerVibrator extends DragListenerWrapper {
 
 	@Override
 	public boolean onDrag(@Nonnull DragButton dragButton, @Nonnull DragEvent event) {
-		boolean result = super.onDrag(dragButton, event);
+		boolean consumed = super.onDrag(dragButton, event);
 
-		if (result) {
+		if (consumed) {
 			vibrator.vibrate();
 		}
 
-		return result;
+		return consumed;
 	}
 }

android-app/src/main/java/org/solovyev/android/calculator/wizard/DragButtonWizardStep.java

@@ -84,7 +84,7 @@ public class DragButtonWizardStep extends WizardFragment {
 
 		dragButton = (DirectionDragButton) root.findViewById(R.id.wizard_dragbutton);
 		dragButton.setOnClickListener(new DragButtonOnClickListener());
-		dragButton.setOnDragListener(new SimpleDragListener(new DragButtonProcessor(), SimpleDragListener.getDefaultPreferences(getActivity())));
+		dragButton.setOnDragListener(new SimpleDragListener(new DragButtonProcessor(), getActivity()));
 		actionTextView = (TextView) root.findViewById(R.id.wizard_dragbutton_action_textview);
 		descriptionTextView = (TextView) root.findViewById(R.id.wizard_dragbutton_description_textview);
 

android-app/src/main/res/values/dimens.xml

@@ -39,4 +39,5 @@
 	<dimen name="activity_horizontal_margin">5dp</dimen>
 	<dimen name="activity_vertical_margin">5dp</dimen>
 	<dimen name="control_margin">5dp</dimen>
+	<dimen name="cpp_min_drag_distance">25dp</dimen>
 </resources>

core/src/main/java/org/solovyev/android/calculator/CalculatorKeyboardImpl.java

@@ -44,7 +44,6 @@ public class CalculatorKeyboardImpl implements CalculatorKeyboard {
 
 	@Override
 	public void buttonPressed(@Nullable final String text) {
-
 		if (!Strings.isEmpty(text)) {
 			if (text == null) throw new AssertionError();