Wizard refactor: beginning

android-app/src/main/java/com/viewpagerindicator/CirclePageIndicator.java

@@ -0,0 +1,556 @@
+/*
+ * Copyright (C) 2011 Patrik Akerfeldt
+ * Copyright (C) 2011 Jake Wharton
+ *
+ * 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.
+ */
+package com.viewpagerindicator;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Paint.Style;
+import android.graphics.drawable.Drawable;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.support.v4.view.MotionEventCompat;
+import android.support.v4.view.ViewConfigurationCompat;
+import android.support.v4.view.ViewPager;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewConfiguration;
+import org.solovyev.android.calculator.R;
+
+import static android.graphics.Paint.ANTI_ALIAS_FLAG;
+import static android.widget.LinearLayout.HORIZONTAL;
+import static android.widget.LinearLayout.VERTICAL;
+
+/**
+ * Draws circles (one for each view). The current view position is filled and
+ * others are only stroked.
+ */
+public class CirclePageIndicator extends View implements PageIndicator {
+    private static final int INVALID_POINTER = -1;
+
+    private float mRadius;
+    private final Paint mPaintPageFill = new Paint(ANTI_ALIAS_FLAG);
+    private final Paint mPaintStroke = new Paint(ANTI_ALIAS_FLAG);
+    private final Paint mPaintFill = new Paint(ANTI_ALIAS_FLAG);
+    private ViewPager mViewPager;
+    private ViewPager.OnPageChangeListener mListener;
+    private int mCurrentPage;
+    private int mSnapPage;
+    private float mPageOffset;
+    private int mScrollState;
+    private int mOrientation;
+    private boolean mCentered;
+    private boolean mSnap;
+
+    private int mTouchSlop;
+    private float mLastMotionX = -1;
+    private int mActivePointerId = INVALID_POINTER;
+    private boolean mIsDragging;
+
+
+    public CirclePageIndicator(Context context) {
+        this(context, null);
+    }
+
+    public CirclePageIndicator(Context context, AttributeSet attrs) {
+        this(context, attrs, R.attr.vpiCirclePageIndicatorStyle);
+    }
+
+    public CirclePageIndicator(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        if (isInEditMode()) return;
+
+        //Load defaults from resources
+        final Resources res = getResources();
+        final int defaultPageColor = res.getColor(R.color.default_circle_indicator_page_color);
+        final int defaultFillColor = res.getColor(R.color.default_circle_indicator_fill_color);
+        final int defaultOrientation = res.getInteger(R.integer.default_circle_indicator_orientation);
+        final int defaultStrokeColor = res.getColor(R.color.default_circle_indicator_stroke_color);
+        final float defaultStrokeWidth = res.getDimension(R.dimen.default_circle_indicator_stroke_width);
+        final float defaultRadius = res.getDimension(R.dimen.default_circle_indicator_radius);
+        final boolean defaultCentered = res.getBoolean(R.bool.default_circle_indicator_centered);
+        final boolean defaultSnap = res.getBoolean(R.bool.default_circle_indicator_snap);
+
+        //Retrieve styles attributes
+        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CirclePageIndicator, defStyle, 0);
+
+        mCentered = a.getBoolean(R.styleable.CirclePageIndicator_centered, defaultCentered);
+        mOrientation = a.getInt(R.styleable.CirclePageIndicator_android_orientation, defaultOrientation);
+        mPaintPageFill.setStyle(Style.FILL);
+        mPaintPageFill.setColor(a.getColor(R.styleable.CirclePageIndicator_pageColor, defaultPageColor));
+        mPaintStroke.setStyle(Style.STROKE);
+        mPaintStroke.setColor(a.getColor(R.styleable.CirclePageIndicator_strokeColor, defaultStrokeColor));
+        mPaintStroke.setStrokeWidth(a.getDimension(R.styleable.CirclePageIndicator_strokeWidth, defaultStrokeWidth));
+        mPaintFill.setStyle(Style.FILL);
+        mPaintFill.setColor(a.getColor(R.styleable.CirclePageIndicator_fillColor, defaultFillColor));
+        mRadius = a.getDimension(R.styleable.CirclePageIndicator_radius, defaultRadius);
+        mSnap = a.getBoolean(R.styleable.CirclePageIndicator_snap, defaultSnap);
+
+        Drawable background = a.getDrawable(R.styleable.CirclePageIndicator_android_background);
+        if (background != null) {
+          setBackgroundDrawable(background);
+        }
+
+        a.recycle();
+
+        final ViewConfiguration configuration = ViewConfiguration.get(context);
+        mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration);
+    }
+
+
+    public void setCentered(boolean centered) {
+        mCentered = centered;
+        invalidate();
+    }
+
+    public boolean isCentered() {
+        return mCentered;
+    }
+
+    public void setPageColor(int pageColor) {
+        mPaintPageFill.setColor(pageColor);
+        invalidate();
+    }
+
+    public int getPageColor() {
+        return mPaintPageFill.getColor();
+    }
+
+    public void setFillColor(int fillColor) {
+        mPaintFill.setColor(fillColor);
+        invalidate();
+    }
+
+    public int getFillColor() {
+        return mPaintFill.getColor();
+    }
+
+    public void setOrientation(int orientation) {
+        switch (orientation) {
+            case HORIZONTAL:
+            case VERTICAL:
+                mOrientation = orientation;
+                requestLayout();
+                break;
+
+            default:
+                throw new IllegalArgumentException("Orientation must be either HORIZONTAL or VERTICAL.");
+        }
+    }
+
+    public int getOrientation() {
+        return mOrientation;
+    }
+
+    public void setStrokeColor(int strokeColor) {
+        mPaintStroke.setColor(strokeColor);
+        invalidate();
+    }
+
+    public int getStrokeColor() {
+        return mPaintStroke.getColor();
+    }
+
+    public void setStrokeWidth(float strokeWidth) {
+        mPaintStroke.setStrokeWidth(strokeWidth);
+        invalidate();
+    }
+
+    public float getStrokeWidth() {
+        return mPaintStroke.getStrokeWidth();
+    }
+
+    public void setRadius(float radius) {
+        mRadius = radius;
+        invalidate();
+    }
+
+    public float getRadius() {
+        return mRadius;
+    }
+
+    public void setSnap(boolean snap) {
+        mSnap = snap;
+        invalidate();
+    }
+
+    public boolean isSnap() {
+        return mSnap;
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+
+        if (mViewPager == null) {
+            return;
+        }
+        final int count = mViewPager.getAdapter().getCount();
+        if (count == 0) {
+            return;
+        }
+
+        if (mCurrentPage >= count) {
+            setCurrentItem(count - 1);
+            return;
+        }
+
+        int longSize;
+        int longPaddingBefore;
+        int longPaddingAfter;
+        int shortPaddingBefore;
+        if (mOrientation == HORIZONTAL) {
+            longSize = getWidth();
+            longPaddingBefore = getPaddingLeft();
+            longPaddingAfter = getPaddingRight();
+            shortPaddingBefore = getPaddingTop();
+        } else {
+            longSize = getHeight();
+            longPaddingBefore = getPaddingTop();
+            longPaddingAfter = getPaddingBottom();
+            shortPaddingBefore = getPaddingLeft();
+        }
+
+        final float threeRadius = mRadius * 3;
+        final float shortOffset = shortPaddingBefore + mRadius;
+        float longOffset = longPaddingBefore + mRadius;
+        if (mCentered) {
+            longOffset += ((longSize - longPaddingBefore - longPaddingAfter) / 2.0f) - ((count * threeRadius) / 2.0f);
+        }
+
+        float dX;
+        float dY;
+
+        float pageFillRadius = mRadius;
+        if (mPaintStroke.getStrokeWidth() > 0) {
+            pageFillRadius -= mPaintStroke.getStrokeWidth() / 2.0f;
+        }
+
+        //Draw stroked circles
+        for (int iLoop = 0; iLoop < count; iLoop++) {
+            float drawLong = longOffset + (iLoop * threeRadius);
+            if (mOrientation == HORIZONTAL) {
+                dX = drawLong;
+                dY = shortOffset;
+            } else {
+                dX = shortOffset;
+                dY = drawLong;
+            }
+            // Only paint fill if not completely transparent
+            if (mPaintPageFill.getAlpha() > 0) {
+                canvas.drawCircle(dX, dY, pageFillRadius, mPaintPageFill);
+            }
+
+            // Only paint stroke if a stroke width was non-zero
+            if (pageFillRadius != mRadius) {
+                canvas.drawCircle(dX, dY, mRadius, mPaintStroke);
+            }
+        }
+
+        //Draw the filled circle according to the current scroll
+        float cx = (mSnap ? mSnapPage : mCurrentPage) * threeRadius;
+        if (!mSnap) {
+            cx += mPageOffset * threeRadius;
+        }
+        if (mOrientation == HORIZONTAL) {
+            dX = longOffset + cx;
+            dY = shortOffset;
+        } else {
+            dX = shortOffset;
+            dY = longOffset + cx;
+        }
+        canvas.drawCircle(dX, dY, mRadius, mPaintFill);
+    }
+
+    public boolean onTouchEvent(MotionEvent ev) {
+        if (super.onTouchEvent(ev)) {
+            return true;
+        }
+        if ((mViewPager == null) || (mViewPager.getAdapter().getCount() == 0)) {
+            return false;
+        }
+
+        final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;
+        switch (action) {
+            case MotionEvent.ACTION_DOWN:
+                mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
+                mLastMotionX = ev.getX();
+                break;
+
+            case MotionEvent.ACTION_MOVE: {
+                final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
+                final float x = MotionEventCompat.getX(ev, activePointerIndex);
+                final float deltaX = x - mLastMotionX;
+
+                if (!mIsDragging) {
+                    if (Math.abs(deltaX) > mTouchSlop) {
+                        mIsDragging = true;
+                    }
+                }
+
+                if (mIsDragging) {
+                    mLastMotionX = x;
+                    if (mViewPager.isFakeDragging() || mViewPager.beginFakeDrag()) {
+                        mViewPager.fakeDragBy(deltaX);
+                    }
+                }
+
+                break;
+            }
+
+            case MotionEvent.ACTION_CANCEL:
+            case MotionEvent.ACTION_UP:
+                if (!mIsDragging) {
+                    final int count = mViewPager.getAdapter().getCount();
+                    final int width = getWidth();
+                    final float halfWidth = width / 2f;
+                    final float sixthWidth = width / 6f;
+
+                    if ((mCurrentPage > 0) && (ev.getX() < halfWidth - sixthWidth)) {
+                        if (action != MotionEvent.ACTION_CANCEL) {
+                            mViewPager.setCurrentItem(mCurrentPage - 1);
+                        }
+                        return true;
+                    } else if ((mCurrentPage < count - 1) && (ev.getX() > halfWidth + sixthWidth)) {
+                        if (action != MotionEvent.ACTION_CANCEL) {
+                            mViewPager.setCurrentItem(mCurrentPage + 1);
+                        }
+                        return true;
+                    }
+                }
+
+                mIsDragging = false;
+                mActivePointerId = INVALID_POINTER;
+                if (mViewPager.isFakeDragging()) mViewPager.endFakeDrag();
+                break;
+
+            case MotionEventCompat.ACTION_POINTER_DOWN: {
+                final int index = MotionEventCompat.getActionIndex(ev);
+                mLastMotionX = MotionEventCompat.getX(ev, index);
+                mActivePointerId = MotionEventCompat.getPointerId(ev, index);
+                break;
+            }
+
+            case MotionEventCompat.ACTION_POINTER_UP:
+                final int pointerIndex = MotionEventCompat.getActionIndex(ev);
+                final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex);
+                if (pointerId == mActivePointerId) {
+                    final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
+                    mActivePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex);
+                }
+                mLastMotionX = MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId));
+                break;
+        }
+
+        return true;
+    }
+
+    @Override
+    public void setViewPager(ViewPager view) {
+        if (mViewPager == view) {
+            return;
+        }
+        if (mViewPager != null) {
+            mViewPager.setOnPageChangeListener(null);
+        }
+        if (view.getAdapter() == null) {
+            throw new IllegalStateException("ViewPager does not have adapter instance.");
+        }
+        mViewPager = view;
+        mViewPager.setOnPageChangeListener(this);
+        invalidate();
+    }
+
+    @Override
+    public void setViewPager(ViewPager view, int initialPosition) {
+        setViewPager(view);
+        setCurrentItem(initialPosition);
+    }
+
+    @Override
+    public void setCurrentItem(int item) {
+        if (mViewPager == null) {
+            throw new IllegalStateException("ViewPager has not been bound.");
+        }
+        mViewPager.setCurrentItem(item);
+        mCurrentPage = item;
+        invalidate();
+    }
+
+    @Override
+    public void notifyDataSetChanged() {
+        invalidate();
+    }
+
+    @Override
+    public void onPageScrollStateChanged(int state) {
+        mScrollState = state;
+
+        if (mListener != null) {
+            mListener.onPageScrollStateChanged(state);
+        }
+    }
+
+    @Override
+    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+        mCurrentPage = position;
+        mPageOffset = positionOffset;
+        invalidate();
+
+        if (mListener != null) {
+            mListener.onPageScrolled(position, positionOffset, positionOffsetPixels);
+        }
+    }
+
+    @Override
+    public void onPageSelected(int position) {
+        if (mSnap || mScrollState == ViewPager.SCROLL_STATE_IDLE) {
+            mCurrentPage = position;
+            mSnapPage = position;
+            invalidate();
+        }
+
+        if (mListener != null) {
+            mListener.onPageSelected(position);
+        }
+    }
+
+    @Override
+    public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {
+        mListener = listener;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see android.view.View#onMeasure(int, int)
+     */
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        if (mOrientation == HORIZONTAL) {
+            setMeasuredDimension(measureLong(widthMeasureSpec), measureShort(heightMeasureSpec));
+        } else {
+            setMeasuredDimension(measureShort(widthMeasureSpec), measureLong(heightMeasureSpec));
+        }
+    }
+
+    /**
+     * Determines the width of this view
+     *
+     * @param measureSpec
+     *            A measureSpec packed into an int
+     * @return The width of the view, honoring constraints from measureSpec
+     */
+    private int measureLong(int measureSpec) {
+        int result;
+        int specMode = MeasureSpec.getMode(measureSpec);
+        int specSize = MeasureSpec.getSize(measureSpec);
+
+        if ((specMode == MeasureSpec.EXACTLY) || (mViewPager == null)) {
+            //We were told how big to be
+            result = specSize;
+        } else {
+            //Calculate the width according the views count
+            final int count = mViewPager.getAdapter().getCount();
+            result = (int)(getPaddingLeft() + getPaddingRight()
+                    + (count * 2 * mRadius) + (count - 1) * mRadius + 1);
+            //Respect AT_MOST value if that was what is called for by measureSpec
+            if (specMode == MeasureSpec.AT_MOST) {
+                result = Math.min(result, specSize);
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Determines the height of this view
+     *
+     * @param measureSpec
+     *            A measureSpec packed into an int
+     * @return The height of the view, honoring constraints from measureSpec
+     */
+    private int measureShort(int measureSpec) {
+        int result;
+        int specMode = MeasureSpec.getMode(measureSpec);
+        int specSize = MeasureSpec.getSize(measureSpec);
+
+        if (specMode == MeasureSpec.EXACTLY) {
+            //We were told how big to be
+            result = specSize;
+        } else {
+            //Measure the height
+            result = (int)(2 * mRadius + getPaddingTop() + getPaddingBottom() + 1);
+            //Respect AT_MOST value if that was what is called for by measureSpec
+            if (specMode == MeasureSpec.AT_MOST) {
+                result = Math.min(result, specSize);
+            }
+        }
+        return result;
+    }
+
+    @Override
+    public void onRestoreInstanceState(Parcelable state) {
+        SavedState savedState = (SavedState)state;
+        super.onRestoreInstanceState(savedState.getSuperState());
+        mCurrentPage = savedState.currentPage;
+        mSnapPage = savedState.currentPage;
+        requestLayout();
+    }
+
+    @Override
+    public Parcelable onSaveInstanceState() {
+        Parcelable superState = super.onSaveInstanceState();
+        SavedState savedState = new SavedState(superState);
+        savedState.currentPage = mCurrentPage;
+        return savedState;
+    }
+
+    static class SavedState extends BaseSavedState {
+        int currentPage;
+
+        public SavedState(Parcelable superState) {
+            super(superState);
+        }
+
+        private SavedState(Parcel in) {
+            super(in);
+            currentPage = in.readInt();
+        }
+
+        @Override
+        public void writeToParcel(Parcel dest, int flags) {
+            super.writeToParcel(dest, flags);
+            dest.writeInt(currentPage);
+        }
+
+        @SuppressWarnings("UnusedDeclaration")
+        public static final Creator<SavedState> CREATOR = new Creator<SavedState>() {
+            @Override
+            public SavedState createFromParcel(Parcel in) {
+                return new SavedState(in);
+            }
+
+            @Override
+            public SavedState[] newArray(int size) {
+                return new SavedState[size];
+            }
+        };
+    }
+}

android-app/src/main/java/com/viewpagerindicator/PageIndicator.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2011 Patrik Akerfeldt
+ * Copyright (C) 2011 Jake Wharton
+ *
+ * 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.
+ */
+
+package com.viewpagerindicator;
+
+import android.support.v4.view.ViewPager;
+
+/**
+ * A PageIndicator is responsible to show an visual indicator on the total views
+ * number and the current visible view.
+ */
+public interface PageIndicator extends ViewPager.OnPageChangeListener {
+    /**
+     * Bind the indicator to a ViewPager.
+     *
+     * @param view
+     */
+    void setViewPager(ViewPager view);
+
+    /**
+     * Bind the indicator to a ViewPager.
+     *
+     * @param view
+     * @param initialPosition
+     */
+    void setViewPager(ViewPager view, int initialPosition);
+
+    /**
+     * <p>Set the current page of both the ViewPager and indicator.</p>
+     *
+     * <p>This <strong>must</strong> be used if you need to set the page before
+     * the views are drawn on screen (e.g., default start page).</p>
+     *
+     * @param item
+     */
+    void setCurrentItem(int item);
+
+    /**
+     * Set a page change listener which will receive forwarded events.
+     *
+     * @param listener
+     */
+    void setOnPageChangeListener(ViewPager.OnPageChangeListener listener);
+
+    /**
+     * Notify the indicator that the fragment list has changed.
+     */
+    void notifyDataSetChanged();
+}

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

@@ -1,50 +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.wizard;
-
-import org.solovyev.android.calculator.CalculatorApplication;
-import org.solovyev.android.calculator.R;
-import org.solovyev.android.wizard.BaseWizardActivity;
-import org.solovyev.android.wizard.Wizards;
-
-import javax.annotation.Nonnull;
-
-public final class CalculatorWizardActivity extends BaseWizardActivity {
-
-	@Nonnull
-	private Wizards wizards;
-
-	public CalculatorWizardActivity() {
-		super(R.layout.cpp_wizard);
-		this.wizards = CalculatorApplication.getInstance().getWizards();
-	}
-
-	@Nonnull
-	public Wizards getWizards() {
-		return wizards;
-	}
-
-	public void setWizards(@Nonnull Wizards wizards) {
-		this.wizards = wizards;
-	}
-}

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

@@ -27,7 +27,7 @@ public class CalculatorWizards implements Wizards {
 	@Nonnull
 	@Override
 	public Class<? extends Activity> getActivityClassName() {
-		return CalculatorWizardActivity.class;
+		return WizardActivity.class;
 	}
 
 	@Nonnull

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

@@ -23,22 +23,23 @@
 package org.solovyev.android.calculator.wizard;
 
 import android.os.Bundle;
-import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-
 import org.solovyev.android.calculator.R;
 
-/**
- * User: serso
- * Date: 6/16/13
- * Time: 9:44 PM
- */
-public final class WelcomeWizardStep extends Fragment {
+public final class WelcomeWizardStep extends WizardFragment {
+
+	@Override
+	protected int getViewResId() {
+		return R.layout.cpp_wizard_step_welcome;
+	}
 
 	@Override
 	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
-		return inflater.inflate(R.layout.cpp_wizard_step_welcome, null);
+		final View view = super.onCreateView(inflater, container, savedInstanceState);
+		setupNextButton(R.string.wizard_start);
+		setupPrevButton(R.string.wizard_skip);
+		return view;
 	}
 }

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

@@ -0,0 +1,139 @@
+package org.solovyev.android.calculator.wizard;
+
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentManager;
+import android.support.v4.app.FragmentStatePagerAdapter;
+import android.support.v4.view.PagerAdapter;
+import android.support.v4.view.ViewPager;
+import com.viewpagerindicator.PageIndicator;
+import org.solovyev.android.calculator.BaseActivity;
+import org.solovyev.android.calculator.CalculatorApplication;
+import org.solovyev.android.calculator.R;
+import org.solovyev.android.wizard.*;
+
+import javax.annotation.Nonnull;
+
+public class WizardActivity extends BaseActivity implements WizardsAware {
+	@Nonnull
+	private final WizardUi<WizardActivity> wizardUi = new WizardUi<WizardActivity>(this, this, 0);
+
+	@Nonnull
+	private ViewPager pager;
+
+	@Nonnull
+	private PagerAdapter pagerAdapter;
+
+	public WizardActivity() {
+		super(R.layout.cpp_activity_wizard);
+	}
+
+	@Override
+	protected void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		wizardUi.onCreate(savedInstanceState);
+		getSupportActionBar().hide();
+		final ListWizardFlow flow = (ListWizardFlow) wizardUi.getFlow();
+
+		pager = (ViewPager) findViewById(R.id.pager);
+		pagerAdapter = new WizardPagerAdapter(flow, getSupportFragmentManager());
+		pager.setAdapter(pagerAdapter);
+		final PageIndicator titleIndicator = (PageIndicator) findViewById(R.id.pager_indicator);
+		titleIndicator.setViewPager(pager);
+		titleIndicator.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
+			@Override
+			public void onPageSelected(int position) {
+				wizardUi.setStep(flow.getStepAt(position));
+			}
+		});
+
+		if (savedInstanceState == null) {
+			final int position = flow.getPositionFor(wizardUi.getStep());
+			pager.setCurrentItem(position);
+		}
+	}
+
+	@Override
+	public void onBackPressed() {
+		if (pager.getCurrentItem() == 0) {
+			super.onBackPressed();
+		} else {
+			pager.setCurrentItem(pager.getCurrentItem() - 1);
+		}
+	}
+
+	@Override
+	protected void onSaveInstanceState(Bundle outState) {
+		super.onSaveInstanceState(outState);
+		wizardUi.onSaveInstanceState(outState);
+	}
+
+	@Override
+	protected void onPause() {
+		super.onPause();
+		wizardUi.onPause();
+	}
+
+	@Nonnull
+	@Override
+	public Wizards getWizards() {
+		return CalculatorApplication.getInstance().getWizards();
+	}
+
+	public void finishWizardAbruptly() {
+		wizardUi.finishWizardAbruptly();
+		finish();
+	}
+
+	public void finishWizard() {
+		wizardUi.finishWizard();
+		finish();
+	}
+
+	public boolean canGoNext() {
+		final int position = pager.getCurrentItem();
+		return position != pagerAdapter.getCount() - 1;
+	}
+
+	public boolean canGoPrev() {
+		final int position = pager.getCurrentItem();
+		return position != 0;
+	}
+
+	public void goNext() {
+		final int position = pager.getCurrentItem();
+		if (position < pagerAdapter.getCount() - 1) {
+			pager.setCurrentItem(position + 1, true);
+		}
+	}
+
+	public void goPrev() {
+		final int position = pager.getCurrentItem();
+		if (position > 0) {
+			pager.setCurrentItem(position - 1, true);
+		}
+	}
+
+	private class WizardPagerAdapter extends FragmentStatePagerAdapter {
+		@Nonnull
+		private final ListWizardFlow flow;
+
+		public WizardPagerAdapter(@Nonnull ListWizardFlow flow, @Nonnull FragmentManager fm) {
+			super(fm);
+			this.flow = flow;
+		}
+
+		@Override
+		public Fragment getItem(int position) {
+			final WizardStep step = flow.getStepAt(position);
+			final String className = step.getFragmentClass().getName();
+			final Bundle args = step.getFragmentArgs();
+			return Fragment.instantiate(WizardActivity.this, className, args);
+		}
+
+		@Override
+		public int getCount() {
+			return flow.getCount();
+		}
+	}
+}

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

@@ -0,0 +1,72 @@
+package org.solovyev.android.calculator.wizard;
+
+import android.os.Bundle;
+import android.support.annotation.LayoutRes;
+import android.support.v4.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+import org.solovyev.android.calculator.R;
+
+import javax.annotation.Nullable;
+
+public abstract class WizardFragment extends Fragment implements View.OnClickListener {
+
+	@Nullable
+	private TextView nextButton;
+
+	@Nullable
+	private TextView prevButton;
+
+	@Override
+	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+		final View view = inflater.inflate(R.layout.fragment_wizard, container, false);
+
+		final ViewGroup content = (ViewGroup) view.findViewById(R.id.wizard_content);
+		inflater.inflate(getViewResId(), content, true);
+
+		nextButton = (TextView) view.findViewById(R.id.wizard_next);
+		if (nextButton != null) {
+			nextButton.setOnClickListener(this);
+		}
+		prevButton = (TextView) view.findViewById(R.id.wizard_prev);
+		if (prevButton != null) {
+			prevButton.setOnClickListener(this);
+		}
+
+		return view;
+	}
+
+	protected final void setupNextButton(int textResId) {
+		assert nextButton != null;
+		nextButton.setText(textResId);
+	}
+
+	protected final void setupPrevButton(int textResId) {
+		assert prevButton != null;
+		prevButton.setText(textResId);
+	}
+
+	@LayoutRes
+	protected abstract int getViewResId();
+
+	@Override
+	public void onClick(View v) {
+		final int id = v.getId();
+		final WizardActivity activity = (WizardActivity) getActivity();
+		if (id == R.id.wizard_next) {
+			if (activity.canGoNext()) {
+				activity.goNext();
+			} else {
+				activity.finishWizard();
+			}
+		} else if (id == R.id.wizard_prev) {
+			if (activity.canGoPrev()) {
+				activity.goPrev();
+			} else {
+				activity.finishWizardAbruptly();
+			}
+		}
+	}
+}

android-app/src/main/java/org/solovyev/android/wizard/BaseWizardActivity.java

@@ -1,44 +0,0 @@
-package org.solovyev.android.wizard;
-
-import android.os.Bundle;
-import android.support.v7.app.ActionBarActivity;
-
-import javax.annotation.Nonnull;
-
-public abstract class BaseWizardActivity extends ActionBarActivity implements WizardsAware, FinishWizardConfirmationDialog.Listener {
-
-	@Nonnull
-	private WizardUi ui;
-
-	protected BaseWizardActivity(int layoutResId) {
-		ui = new WizardUi<BaseWizardActivity>(this, this, layoutResId);
-	}
-
-	@Override
-	protected void onCreate(Bundle savedInstanceState) {
-		super.onCreate(savedInstanceState);
-		ui.onCreate(savedInstanceState);
-	}
-
-	@Override
-	protected void onSaveInstanceState(Bundle out) {
-		super.onSaveInstanceState(out);
-		ui.onSaveInstanceState(out);
-	}
-
-	@Override
-	public void onPause() {
-		super.onPause();
-		ui.onPause();
-	}
-
-	@Override
-	public void onBackPressed() {
-		ui.onBackPressed();
-	}
-
-	@Override
-	public void finishWizardAbruptly() {
-		ui.finishWizardAbruptly();
-	}
-}

android-app/src/main/java/org/solovyev/android/wizard/ListWizardFlow.java

@@ -22,33 +22,28 @@
 
 package org.solovyev.android.wizard;
 
-import org.solovyev.common.JPredicate;
-
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import java.util.List;
 
-import static org.solovyev.common.collections.Collections.find;
-
 public final class ListWizardFlow implements WizardFlow {
 
 	@Nonnull
-	private final List<WizardStep> steps;
+	private final List<? extends WizardStep> steps;
 
-	public ListWizardFlow(@Nonnull List<WizardStep> steps) {
+	public ListWizardFlow(@Nonnull List<? extends WizardStep> steps) {
 		this.steps = steps;
 	}
 
 	@Nullable
 	@Override
 	public WizardStep getStepByName(@Nonnull final String name) {
-		return find(steps, new JPredicate<WizardStep>() {
-			@Override
-			public boolean apply(@Nullable WizardStep step) {
-				assert step != null;
-				return step.getName().equals(name);
+		for (WizardStep step : steps) {
+			if (step.getName().equals(name)) {
+				return step;
 			}
-		});
+		}
+		return null;
 	}
 
 	@Nullable
@@ -78,4 +73,24 @@ public final class ListWizardFlow implements WizardFlow {
 	public WizardStep getFirstStep() {
 		return steps.get(0);
 	}
+
+	@Nonnull
+	public WizardStep getStepAt(int position) {
+		return steps.get(position);
+	}
+
+	public int getPositionFor(@Nonnull WizardStep step) {
+		for (int i = 0; i < steps.size(); i++) {
+			if (steps.get(i).equals(step)) {
+				return i;
+			}
+
+		}
+
+		return -1;
+	}
+
+	public int getCount() {
+		return steps.size();
+	}
 }

android-app/src/main/java/org/solovyev/android/wizard/WizardUi.java

@@ -6,63 +6,25 @@ import android.os.Bundle;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentActivity;
 import android.support.v4.app.FragmentManager;
-import android.support.v4.app.FragmentTransaction;
-import android.view.View;
-import android.widget.Button;
-import org.solovyev.android.calculator.R;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-import static android.view.View.GONE;
-import static android.view.View.VISIBLE;
-
-public class WizardUi<A extends FragmentActivity & FinishWizardConfirmationDialog.Listener> {
-
-	/*
-	**********************************************************************
-	*
-	*                           CONSTANTS
-	*
-	**********************************************************************
-	*/
+public class WizardUi<A extends FragmentActivity> {
 
 	private static final String FLOW = "flow";
 	private static final String STEP = "step";
 
-	/*
-	**********************************************************************
-	*
-	*                           FIELDS
-	*
-	**********************************************************************
-	*/
-
-	private WizardStep step;
-
-	private Wizard wizard;
-
-	/*
-	**********************************************************************
-	*
-	*                           VIEWS
-	*
-	**********************************************************************
-	*/
-
-	@Nullable
-	private View prevButton;
+	protected WizardStep step;
+	protected Wizard wizard;
 
 	@Nonnull
-	private Button nextButton;
+	protected final A activity;
 
 	@Nonnull
-	private final A activity;
+	protected final WizardsAware wizardsAware;
 
-	@Nonnull
-	private final WizardsAware wizardsAware;
-
-	private final int layoutResId;
+	protected final int layoutResId;
 
 	public WizardUi(@Nonnull A activity, @Nonnull WizardsAware wizardsAware, int layoutResId) {
 		this.activity = activity;
@@ -70,22 +32,14 @@ public class WizardUi<A extends FragmentActivity & FinishWizardConfirmationDialo
 		this.layoutResId = layoutResId;
 	}
 
-	/*
-	**********************************************************************
-	*
-	*                           LIFECYCLE
-	*
-	**********************************************************************
-	*/
-
 	public void onCreate(@Nullable Bundle savedInstanceState) {
-		activity.setContentView(layoutResId);
+		if (layoutResId != 0) {
+			activity.setContentView(layoutResId);
+		}
 
-		prevButton = activity.findViewById(R.id.acl_wizard_prev_button);
-		nextButton = (Button) activity.findViewById(R.id.acl_wizard_next_button);
-
-		String wizardName = activity.getIntent().getStringExtra(FLOW);
-		String stepName = activity.getIntent().getStringExtra(STEP);
+		final Intent intent = activity.getIntent();
+		String wizardName = intent.getStringExtra(FLOW);
+		String stepName = intent.getStringExtra(STEP);
 		if (savedInstanceState != null) {
 			wizardName = savedInstanceState.getString(FLOW);
 			stepName = savedInstanceState.getString(STEP);
@@ -93,7 +47,6 @@ public class WizardUi<A extends FragmentActivity & FinishWizardConfirmationDialo
 
 		wizard = wizardsAware.getWizards().getWizard(wizardName);
 
-		WizardStep step = null;
 		if (stepName != null) {
 			step = wizard.getFlow().getStepByName(stepName);
 		}
@@ -101,70 +54,10 @@ public class WizardUi<A extends FragmentActivity & FinishWizardConfirmationDialo
 		if (step == null) {
 			step = wizard.getFlow().getFirstStep();
 		}
-
-		setStep(step);
 	}
 
-
-	public void setStep(@Nonnull WizardStep step) {
-		if (this.step == null || !this.step.equals(step)) {
-			hideFragment();
-			this.step = step;
-			showFragment();
-
-			initTitle();
-			initNextButton();
-			initPrevButton();
-		}
-	}
-
-	private void initTitle() {
-		activity.setTitle(step.getTitleResId());
-	}
-
-	private void initPrevButton() {
-		if (prevButton != null) {
-			final WizardStep prevStep = wizard.getFlow().getPrevStep(step);
-			if (prevStep == null) {
-				prevButton.setVisibility(GONE);
-				prevButton.setOnClickListener(null);
-			} else {
-				prevButton.setVisibility(VISIBLE);
-				prevButton.setOnClickListener(new View.OnClickListener() {
-					@Override
-					public void onClick(View v) {
-						if (tryGoPrev()) {
-							setStep(prevStep);
-						}
-					}
-				});
-			}
-		}
-	}
-
-	private void initNextButton() {
-		final WizardStep nextStep = wizard.getFlow().getNextStep(step);
-		if (nextStep == null) {
-			nextButton.setText(R.string.acl_wizard_finish);
-			nextButton.setOnClickListener(new View.OnClickListener() {
-				@Override
-				public void onClick(View v) {
-					if (tryGoNext()) {
-						finishWizard();
-					}
-				}
-			});
-		} else {
-			nextButton.setText(step.getNextButtonTitleResId());
-			nextButton.setOnClickListener(new View.OnClickListener() {
-				@Override
-				public void onClick(View v) {
-					if (tryGoNext()) {
-						setStep(nextStep);
-					}
-				}
-			});
-		}
+	public void setStep(WizardStep step) {
+		this.step = step;
 	}
 
 	public void finishWizardAbruptly() {
@@ -175,14 +68,14 @@ public class WizardUi<A extends FragmentActivity & FinishWizardConfirmationDialo
 		finishWizard(false);
 	}
 
-	void finishWizard(boolean forceFinish) {
+	protected final void finishWizard(boolean forceFinish) {
 		if (wizard != null && step != null) {
 			wizard.saveFinished(step, forceFinish);
 		}
 		activity.finish();
 	}
 
-	private boolean tryGoPrev() {
+	protected final boolean tryGoPrev() {
 		if (step == null) {
 			return true;
 		} else {
@@ -192,11 +85,11 @@ public class WizardUi<A extends FragmentActivity & FinishWizardConfirmationDialo
 	}
 
 	@Nonnull
-	private FragmentManager getFragmentManager() {
+	protected final FragmentManager getFragmentManager() {
 		return activity.getSupportFragmentManager();
 	}
 
-	private boolean tryGoNext() {
+	protected final boolean tryGoNext() {
 		if (step == null) {
 			return true;
 		} else {
@@ -205,43 +98,6 @@ public class WizardUi<A extends FragmentActivity & FinishWizardConfirmationDialo
 		}
 	}
 
-	@Nonnull
-	private Fragment showFragment() {
-		final FragmentManager fm = getFragmentManager();
-		final FragmentTransaction ft = fm.beginTransaction();
-
-		Fragment newFragment = fm.findFragmentByTag(step.getFragmentTag());
-
-		if (newFragment == null) {
-			newFragment = Fragment.instantiate(activity, step.getFragmentClass().getName(), step.getFragmentArgs());
-			ft.add(R.id.acl_wizard_content, newFragment, step.getFragmentTag());
-		}
-
-		ft.commit();
-		fm.executePendingTransactions();
-
-		return newFragment;
-	}
-
-	private void hideFragment() {
-		final FragmentManager fm = getFragmentManager();
-		final FragmentTransaction ft = fm.beginTransaction();
-
-		if (step != null) {
-			hideFragmentByTag(fm, ft, step.getFragmentTag());
-		}
-
-		ft.commit();
-		fm.executePendingTransactions();
-	}
-
-	private void hideFragmentByTag(@Nonnull FragmentManager fm, @Nonnull FragmentTransaction ft, @Nonnull String fragmentTag) {
-		final Fragment oldFragment = fm.findFragmentByTag(fragmentTag);
-		if (oldFragment != null) {
-			ft.remove(oldFragment);
-		}
-	}
-
 	public void onSaveInstanceState(@Nonnull Bundle out) {
 		out.putString(FLOW, wizard.getName());
 		out.putString(STEP, step.getName());
@@ -253,18 +109,6 @@ public class WizardUi<A extends FragmentActivity & FinishWizardConfirmationDialo
 		}
 	}
 
-	public void onBackPressed() {
-		FinishWizardConfirmationDialog.show(activity);
-	}
-
-	/*
-	**********************************************************************
-	*
-	*                           GETTERS
-	*
-	**********************************************************************
-	*/
-
 	public WizardStep getStep() {
 		return step;
 	}
@@ -277,23 +121,6 @@ public class WizardUi<A extends FragmentActivity & FinishWizardConfirmationDialo
 		return wizard;
 	}
 
-	@Nullable
-	public View getPrevButton() {
-		return prevButton;
-	}
-
-	public View getNextButton() {
-		return nextButton;
-	}
-
-	/*
-	**********************************************************************
-	*
-	*                           STATIC
-	*
-	**********************************************************************
-	*/
-
 	public static void startWizard(@Nonnull Wizards wizards, @Nonnull Context context) {
 		context.startActivity(createLaunchIntent(wizards, null, context));
 	}
@@ -329,5 +156,4 @@ public class WizardUi<A extends FragmentActivity & FinishWizardConfirmationDialo
 		intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
 		return intent;
 	}
-
 }