1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.gallery3d.filtershow.imageshow;
18
19import android.animation.Animator;
20import android.animation.ValueAnimator;
21import android.content.Context;
22import android.content.res.Resources;
23import android.graphics.Bitmap;
24import android.graphics.BitmapFactory;
25import android.graphics.BitmapShader;
26import android.graphics.Canvas;
27import android.graphics.Color;
28import android.graphics.Matrix;
29import android.graphics.Paint;
30import android.graphics.Point;
31import android.graphics.Rect;
32import android.graphics.RectF;
33import android.graphics.Shader;
34import android.graphics.drawable.NinePatchDrawable;
35import android.support.v4.widget.EdgeEffectCompat;
36import android.util.AttributeSet;
37import android.util.Log;
38import android.view.GestureDetector;
39import android.view.GestureDetector.OnDoubleTapListener;
40import android.view.GestureDetector.OnGestureListener;
41import android.view.MotionEvent;
42import android.view.ScaleGestureDetector;
43import android.view.View;
44import android.widget.LinearLayout;
45
46import com.android.gallery3d.R;
47import com.android.gallery3d.filtershow.FilterShowActivity;
48import com.android.gallery3d.filtershow.filters.FilterMirrorRepresentation;
49import com.android.gallery3d.filtershow.filters.FilterRepresentation;
50import com.android.gallery3d.filtershow.filters.ImageFilter;
51import com.android.gallery3d.filtershow.pipeline.ImagePreset;
52import com.android.gallery3d.filtershow.tools.SaveImage;
53
54import java.io.File;
55import java.util.ArrayList;
56
57public class ImageShow extends View implements OnGestureListener,
58        ScaleGestureDetector.OnScaleGestureListener,
59        OnDoubleTapListener {
60
61    private static final String LOGTAG = "ImageShow";
62    private static final boolean ENABLE_ZOOMED_COMPARISON = false;
63
64    protected Paint mPaint = new Paint();
65    protected int mTextSize;
66    protected int mTextPadding;
67
68    protected int mBackgroundColor;
69
70    private GestureDetector mGestureDetector = null;
71    private ScaleGestureDetector mScaleGestureDetector = null;
72
73    protected Rect mImageBounds = new Rect();
74    private boolean mOriginalDisabled = false;
75    private boolean mTouchShowOriginal = false;
76    private long mTouchShowOriginalDate = 0;
77    private final long mTouchShowOriginalDelayMin = 200; // 200ms
78    private int mShowOriginalDirection = 0;
79    private static int UNVEIL_HORIZONTAL = 1;
80    private static int UNVEIL_VERTICAL = 2;
81
82    private NinePatchDrawable mShadow = null;
83    private Rect mShadowBounds = new Rect();
84    private int mShadowMargin = 15; // not scaled, fixed in the asset
85    private boolean mShadowDrawn = false;
86
87    private Point mTouchDown = new Point();
88    private Point mTouch = new Point();
89    private boolean mFinishedScalingOperation = false;
90
91    private int mOriginalTextMargin;
92    private int mOriginalTextSize;
93    private String mOriginalText;
94    private boolean mZoomIn = false;
95    Point mOriginalTranslation = new Point();
96    float mOriginalScale;
97    float mStartFocusX, mStartFocusY;
98
99    private EdgeEffectCompat mEdgeEffect = null;
100    private static final int EDGE_LEFT = 1;
101    private static final int EDGE_TOP = 2;
102    private static final int EDGE_RIGHT = 3;
103    private static final int EDGE_BOTTOM = 4;
104    private int mCurrentEdgeEffect = 0;
105    private int mEdgeSize = 100;
106
107    private static final int mAnimationSnapDelay = 200;
108    private static final int mAnimationZoomDelay = 400;
109    private ValueAnimator mAnimatorScale = null;
110    private ValueAnimator mAnimatorTranslateX = null;
111    private ValueAnimator mAnimatorTranslateY = null;
112
113    private enum InteractionMode {
114        NONE,
115        SCALE,
116        MOVE
117    }
118    InteractionMode mInteractionMode = InteractionMode.NONE;
119
120    private static Bitmap sMask;
121    private Paint mMaskPaint = new Paint();
122    private Matrix mShaderMatrix = new Matrix();
123    private boolean mDidStartAnimation = false;
124
125    private static Bitmap convertToAlphaMask(Bitmap b) {
126        Bitmap a = Bitmap.createBitmap(b.getWidth(), b.getHeight(), Bitmap.Config.ALPHA_8);
127        Canvas c = new Canvas(a);
128        c.drawBitmap(b, 0.0f, 0.0f, null);
129        return a;
130    }
131
132    private static Shader createShader(Bitmap b) {
133        return new BitmapShader(b, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
134    }
135
136    private FilterShowActivity mActivity = null;
137
138    public FilterShowActivity getActivity() {
139        return mActivity;
140    }
141
142    public boolean hasModifications() {
143        return MasterImage.getImage().hasModifications();
144    }
145
146    public void resetParameter() {
147        // TODO: implement reset
148    }
149
150    public void onNewValue(int parameter) {
151        invalidate();
152    }
153
154    public ImageShow(Context context, AttributeSet attrs, int defStyle) {
155        super(context, attrs, defStyle);
156        setupImageShow(context);
157    }
158
159    public ImageShow(Context context, AttributeSet attrs) {
160        super(context, attrs);
161        setupImageShow(context);
162
163    }
164
165    public ImageShow(Context context) {
166        super(context);
167        setupImageShow(context);
168    }
169
170    private void setupImageShow(Context context) {
171        Resources res = context.getResources();
172        mTextSize = res.getDimensionPixelSize(R.dimen.photoeditor_text_size);
173        mTextPadding = res.getDimensionPixelSize(R.dimen.photoeditor_text_padding);
174        mOriginalTextMargin = res.getDimensionPixelSize(R.dimen.photoeditor_original_text_margin);
175        mOriginalTextSize = res.getDimensionPixelSize(R.dimen.photoeditor_original_text_size);
176        mBackgroundColor = res.getColor(R.color.background_screen);
177        mOriginalText = res.getString(R.string.original_picture_text);
178        mShadow = (NinePatchDrawable) res.getDrawable(R.drawable.geometry_shadow);
179        setupGestureDetector(context);
180        mActivity = (FilterShowActivity) context;
181        if (sMask == null) {
182            Bitmap mask = BitmapFactory.decodeResource(res, R.drawable.spot_mask);
183            sMask = convertToAlphaMask(mask);
184        }
185        mEdgeEffect = new EdgeEffectCompat(context);
186        mEdgeSize = res.getDimensionPixelSize(R.dimen.edge_glow_size);
187    }
188
189    public void attach() {
190        MasterImage.getImage().addObserver(this);
191        bindAsImageLoadListener();
192        MasterImage.getImage().resetGeometryImages(false);
193    }
194
195    public void detach() {
196        MasterImage.getImage().removeObserver(this);
197        mMaskPaint.reset();
198    }
199
200    public void setupGestureDetector(Context context) {
201        mGestureDetector = new GestureDetector(context, this);
202        mScaleGestureDetector = new ScaleGestureDetector(context, this);
203    }
204
205    @Override
206    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
207        int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
208        int parentHeight = MeasureSpec.getSize(heightMeasureSpec);
209        setMeasuredDimension(parentWidth, parentHeight);
210    }
211
212    public ImageFilter getCurrentFilter() {
213        return MasterImage.getImage().getCurrentFilter();
214    }
215
216    /* consider moving the following 2 methods into a subclass */
217    /**
218     * This function calculates a Image to Screen Transformation matrix
219     *
220     * @param reflectRotation set true if you want the rotation encoded
221     * @return Image to Screen transformation matrix
222     */
223    protected Matrix getImageToScreenMatrix(boolean reflectRotation) {
224        MasterImage master = MasterImage.getImage();
225        if (master.getOriginalBounds() == null) {
226            return new Matrix();
227        }
228        Matrix m = GeometryMathUtils.getImageToScreenMatrix(master.getPreset().getGeometryFilters(),
229                reflectRotation, master.getOriginalBounds(), getWidth(), getHeight());
230        Point translate = master.getTranslation();
231        float scaleFactor = master.getScaleFactor();
232        m.postTranslate(translate.x, translate.y);
233        m.postScale(scaleFactor, scaleFactor, getWidth() / 2.0f, getHeight() / 2.0f);
234        return m;
235    }
236
237    /**
238     * This function calculates a to Screen Image Transformation matrix
239     *
240     * @param reflectRotation set true if you want the rotation encoded
241     * @return Screen to Image transformation matrix
242     */
243    protected Matrix getScreenToImageMatrix(boolean reflectRotation) {
244        Matrix m = getImageToScreenMatrix(reflectRotation);
245        Matrix invert = new Matrix();
246        m.invert(invert);
247        return invert;
248    }
249
250    public ImagePreset getImagePreset() {
251        return MasterImage.getImage().getPreset();
252    }
253
254    @Override
255    public void onDraw(Canvas canvas) {
256        mPaint.reset();
257        mPaint.setAntiAlias(true);
258        mPaint.setFilterBitmap(true);
259        MasterImage.getImage().setImageShowSize(
260                getWidth() - 2*mShadowMargin,
261                getHeight() - 2*mShadowMargin);
262
263        MasterImage img = MasterImage.getImage();
264        // Hide the loading indicator as needed
265        if (mActivity.isLoadingVisible() && getFilteredImage() != null) {
266            if ((img.getLoadedPreset() == null)
267                    || (img.getLoadedPreset() != null
268                    && img.getLoadedPreset().equals(img.getCurrentPreset()))) {
269                mActivity.stopLoadingIndicator();
270            } else if (img.getLoadedPreset() != null) {
271                return;
272            }
273            mActivity.stopLoadingIndicator();
274        }
275
276        canvas.save();
277
278        mShadowDrawn = false;
279
280        Bitmap highresPreview = MasterImage.getImage().getHighresImage();
281        Bitmap fullHighres = MasterImage.getImage().getPartialImage();
282
283        boolean isDoingNewLookAnimation = MasterImage.getImage().onGoingNewLookAnimation();
284
285        if (highresPreview == null || isDoingNewLookAnimation) {
286            drawImageAndAnimate(canvas, getFilteredImage());
287        } else {
288            drawImageAndAnimate(canvas, highresPreview);
289        }
290
291        drawHighresImage(canvas, fullHighres);
292        drawCompareImage(canvas, getGeometryOnlyImage());
293
294        canvas.restore();
295
296        if (!mEdgeEffect.isFinished()) {
297            canvas.save();
298            float dx = (getHeight() - getWidth()) / 2f;
299            if (getWidth() > getHeight()) {
300                dx = - (getWidth() - getHeight()) / 2f;
301            }
302            if (mCurrentEdgeEffect == EDGE_BOTTOM) {
303                canvas.rotate(180, getWidth()/2, getHeight()/2);
304            } else if (mCurrentEdgeEffect == EDGE_RIGHT) {
305                canvas.rotate(90, getWidth()/2, getHeight()/2);
306                canvas.translate(0, dx);
307            } else if (mCurrentEdgeEffect == EDGE_LEFT) {
308                canvas.rotate(270, getWidth()/2, getHeight()/2);
309                canvas.translate(0, dx);
310            }
311            if (mCurrentEdgeEffect != 0) {
312                mEdgeEffect.draw(canvas);
313            }
314            canvas.restore();
315            invalidate();
316        } else {
317            mCurrentEdgeEffect = 0;
318        }
319    }
320
321    private void drawHighresImage(Canvas canvas, Bitmap fullHighres) {
322        Matrix originalToScreen = MasterImage.getImage().originalImageToScreen();
323        if (fullHighres != null && originalToScreen != null) {
324            Matrix screenToOriginal = new Matrix();
325            originalToScreen.invert(screenToOriginal);
326            Rect rBounds = new Rect();
327            rBounds.set(MasterImage.getImage().getPartialBounds());
328            if (fullHighres != null) {
329                originalToScreen.preTranslate(rBounds.left, rBounds.top);
330                canvas.clipRect(mImageBounds);
331                canvas.drawBitmap(fullHighres, originalToScreen, mPaint);
332            }
333        }
334    }
335
336    public void resetImageCaches(ImageShow caller) {
337        MasterImage.getImage().invalidatePreview();
338    }
339
340    public Bitmap getFiltersOnlyImage() {
341        return MasterImage.getImage().getFiltersOnlyImage();
342    }
343
344    public Bitmap getGeometryOnlyImage() {
345        return MasterImage.getImage().getGeometryOnlyImage();
346    }
347
348    public Bitmap getFilteredImage() {
349        return MasterImage.getImage().getFilteredImage();
350    }
351
352    public void drawImageAndAnimate(Canvas canvas,
353                                    Bitmap image) {
354        if (image == null) {
355            return;
356        }
357        MasterImage master = MasterImage.getImage();
358        Matrix m = master.computeImageToScreen(image, 0, false);
359        if (m == null) {
360            return;
361        }
362
363        canvas.save();
364
365        RectF d = new RectF(0, 0, image.getWidth(), image.getHeight());
366        m.mapRect(d);
367        d.roundOut(mImageBounds);
368
369        boolean showAnimatedImage = master.onGoingNewLookAnimation();
370        if (!showAnimatedImage && mDidStartAnimation) {
371            // animation ended, but do we have the correct image to show?
372            if (master.getPreset().equals(master.getCurrentPreset())) {
373                // we do, let's stop showing the animated image
374                mDidStartAnimation = false;
375                MasterImage.getImage().resetAnimBitmap();
376            } else {
377                showAnimatedImage = true;
378            }
379        } else if (showAnimatedImage) {
380            mDidStartAnimation = true;
381        }
382
383        if (showAnimatedImage) {
384            canvas.save();
385
386            // Animation uses the image before the change
387            Bitmap previousImage = master.getPreviousImage();
388            Matrix mp = master.computeImageToScreen(previousImage, 0, false);
389            RectF dp = new RectF(0, 0, previousImage.getWidth(), previousImage.getHeight());
390            mp.mapRect(dp);
391            Rect previousBounds = new Rect();
392            dp.roundOut(previousBounds);
393            float centerX = dp.centerX();
394            float centerY = dp.centerY();
395            boolean needsToDrawImage = true;
396
397            if (master.getCurrentLookAnimation()
398                    == MasterImage.CIRCLE_ANIMATION) {
399                float maskScale = MasterImage.getImage().getMaskScale();
400                if (maskScale >= 0.0f) {
401                    float maskW = sMask.getWidth() / 2.0f;
402                    float maskH = sMask.getHeight() / 2.0f;
403                    Point point = mActivity.hintTouchPoint(this);
404                    float maxMaskScale = 2 * Math.max(getWidth(), getHeight())
405                            / Math.min(maskW, maskH);
406                    maskScale = maskScale * maxMaskScale;
407                    float x = point.x - maskW * maskScale;
408                    float y = point.y - maskH * maskScale;
409
410                    // Prepare the shader
411                    mShaderMatrix.reset();
412                    mShaderMatrix.setScale(1.0f / maskScale, 1.0f / maskScale);
413                    mShaderMatrix.preTranslate(-x + mImageBounds.left, -y + mImageBounds.top);
414                    float scaleImageX = mImageBounds.width() / (float) image.getWidth();
415                    float scaleImageY = mImageBounds.height() / (float) image.getHeight();
416                    mShaderMatrix.preScale(scaleImageX, scaleImageY);
417                    mMaskPaint.reset();
418                    Shader maskShader = createShader(image);
419                    maskShader.setLocalMatrix(mShaderMatrix);
420                    mMaskPaint.setShader(maskShader);
421
422                    drawShadow(canvas, mImageBounds); // as needed
423                    canvas.drawBitmap(previousImage, m, mPaint);
424                    canvas.clipRect(mImageBounds);
425                    canvas.translate(x, y);
426                    canvas.scale(maskScale, maskScale);
427                    canvas.drawBitmap(sMask, 0, 0, mMaskPaint);
428                    needsToDrawImage = false;
429                }
430            } else if (master.getCurrentLookAnimation()
431                    == MasterImage.ROTATE_ANIMATION) {
432                Rect d1 = computeImageBounds(master.getPreviousImage().getHeight(),
433                        master.getPreviousImage().getWidth());
434                Rect d2 = computeImageBounds(master.getPreviousImage().getWidth(),
435                        master.getPreviousImage().getHeight());
436                float finalScale = d1.width() / (float) d2.height();
437                finalScale = (1.0f * (1.0f - master.getAnimFraction()))
438                        + (finalScale * master.getAnimFraction());
439                canvas.rotate(master.getAnimRotationValue(), centerX, centerY);
440                canvas.scale(finalScale, finalScale, centerX, centerY);
441            } else if (master.getCurrentLookAnimation()
442                    == MasterImage.MIRROR_ANIMATION) {
443                if (master.getCurrentFilterRepresentation()
444                        instanceof FilterMirrorRepresentation) {
445                    FilterMirrorRepresentation rep =
446                            (FilterMirrorRepresentation) master.getCurrentFilterRepresentation();
447
448                    ImagePreset preset = master.getPreset();
449                    ArrayList<FilterRepresentation> geometry =
450                            (ArrayList<FilterRepresentation>) preset.getGeometryFilters();
451                    GeometryMathUtils.GeometryHolder holder = null;
452                    holder = GeometryMathUtils.unpackGeometry(geometry);
453
454                    if (holder.rotation.value() == 90 || holder.rotation.value() == 270) {
455                        if (rep.isHorizontal() && !rep.isVertical()) {
456                            canvas.scale(1, master.getAnimRotationValue(), centerX, centerY);
457                        } else if (rep.isVertical() && !rep.isHorizontal()) {
458                            canvas.scale(1, master.getAnimRotationValue(), centerX, centerY);
459                        } else if (rep.isHorizontal() && rep.isVertical()) {
460                            canvas.scale(master.getAnimRotationValue(), 1, centerX, centerY);
461                        } else {
462                            canvas.scale(master.getAnimRotationValue(), 1, centerX, centerY);
463                        }
464                    } else {
465                        if (rep.isHorizontal() && !rep.isVertical()) {
466                            canvas.scale(master.getAnimRotationValue(), 1, centerX, centerY);
467                        } else if (rep.isVertical() && !rep.isHorizontal()) {
468                            canvas.scale(master.getAnimRotationValue(), 1, centerX, centerY);
469                        } else  if (rep.isHorizontal() && rep.isVertical()) {
470                            canvas.scale(1, master.getAnimRotationValue(), centerX, centerY);
471                        } else {
472                            canvas.scale(1, master.getAnimRotationValue(), centerX, centerY);
473                        }
474                    }
475                }
476            }
477
478            if (needsToDrawImage) {
479                drawShadow(canvas, previousBounds); // as needed
480                canvas.drawBitmap(previousImage, mp, mPaint);
481            }
482
483            canvas.restore();
484        } else {
485            drawShadow(canvas, mImageBounds); // as needed
486            canvas.drawBitmap(image, m, mPaint);
487        }
488
489        canvas.restore();
490    }
491
492    private Rect computeImageBounds(int imageWidth, int imageHeight) {
493        float scale = GeometryMathUtils.scale(imageWidth, imageHeight,
494                getWidth(), getHeight());
495
496        float w = imageWidth * scale;
497        float h = imageHeight * scale;
498        float ty = (getHeight() - h) / 2.0f;
499        float tx = (getWidth() - w) / 2.0f;
500        return new Rect((int) tx + mShadowMargin,
501                (int) ty + mShadowMargin,
502                (int) (w + tx) - mShadowMargin,
503                (int) (h + ty) - mShadowMargin);
504    }
505
506    private void drawShadow(Canvas canvas, Rect d) {
507        if (!mShadowDrawn) {
508            mShadowBounds.set(d.left - mShadowMargin, d.top - mShadowMargin,
509                    d.right + mShadowMargin, d.bottom + mShadowMargin);
510            mShadow.setBounds(mShadowBounds);
511            mShadow.draw(canvas);
512            mShadowDrawn = true;
513        }
514    }
515
516    public void drawCompareImage(Canvas canvas, Bitmap image) {
517        MasterImage master = MasterImage.getImage();
518        boolean showsOriginal = master.showsOriginal();
519        if (!showsOriginal && !mTouchShowOriginal)
520            return;
521        canvas.save();
522        if (image != null) {
523            if (mShowOriginalDirection == 0) {
524                if (Math.abs(mTouch.y - mTouchDown.y) > Math.abs(mTouch.x - mTouchDown.x)) {
525                    mShowOriginalDirection = UNVEIL_VERTICAL;
526                } else {
527                    mShowOriginalDirection = UNVEIL_HORIZONTAL;
528                }
529            }
530
531            int px = 0;
532            int py = 0;
533            if (mShowOriginalDirection == UNVEIL_VERTICAL) {
534                px = mImageBounds.width();
535                py = mTouch.y - mImageBounds.top;
536            } else {
537                px = mTouch.x - mImageBounds.left;
538                py = mImageBounds.height();
539                if (showsOriginal) {
540                    px = mImageBounds.width();
541                }
542            }
543
544            Rect d = new Rect(mImageBounds.left, mImageBounds.top,
545                    mImageBounds.left + px, mImageBounds.top + py);
546            if (mShowOriginalDirection == UNVEIL_HORIZONTAL) {
547                if (mTouchDown.x - mTouch.x > 0) {
548                    d.set(mImageBounds.left + px, mImageBounds.top,
549                            mImageBounds.right, mImageBounds.top + py);
550                }
551            } else {
552                if (mTouchDown.y - mTouch.y > 0) {
553                    d.set(mImageBounds.left, mImageBounds.top + py,
554                            mImageBounds.left + px, mImageBounds.bottom);
555                }
556            }
557            canvas.clipRect(d);
558            Matrix m = master.computeImageToScreen(image, 0, false);
559            canvas.drawBitmap(image, m, mPaint);
560            Paint paint = new Paint();
561            paint.setColor(Color.BLACK);
562            paint.setStrokeWidth(3);
563
564            if (mShowOriginalDirection == UNVEIL_VERTICAL) {
565                canvas.drawLine(mImageBounds.left, mTouch.y,
566                        mImageBounds.right, mTouch.y, paint);
567            } else {
568                canvas.drawLine(mTouch.x, mImageBounds.top,
569                        mTouch.x, mImageBounds.bottom, paint);
570            }
571
572            Rect bounds = new Rect();
573            paint.setAntiAlias(true);
574            paint.setTextSize(mOriginalTextSize);
575            paint.getTextBounds(mOriginalText, 0, mOriginalText.length(), bounds);
576            paint.setColor(Color.BLACK);
577            paint.setStyle(Paint.Style.STROKE);
578            paint.setStrokeWidth(3);
579            canvas.drawText(mOriginalText, mImageBounds.left + mOriginalTextMargin,
580                    mImageBounds.top + bounds.height() + mOriginalTextMargin, paint);
581            paint.setStyle(Paint.Style.FILL);
582            paint.setStrokeWidth(1);
583            paint.setColor(Color.WHITE);
584            canvas.drawText(mOriginalText, mImageBounds.left + mOriginalTextMargin,
585                    mImageBounds.top + bounds.height() + mOriginalTextMargin, paint);
586        }
587        canvas.restore();
588    }
589
590    public void bindAsImageLoadListener() {
591        MasterImage.getImage().addListener(this);
592    }
593
594    public void updateImage() {
595        invalidate();
596    }
597
598    public void imageLoaded() {
599        updateImage();
600    }
601
602    public void saveImage(FilterShowActivity filterShowActivity, File file) {
603        SaveImage.saveImage(getImagePreset(), filterShowActivity, file);
604    }
605
606
607    public boolean scaleInProgress() {
608        return mScaleGestureDetector.isInProgress();
609    }
610
611    @Override
612    public boolean onTouchEvent(MotionEvent event) {
613        super.onTouchEvent(event);
614        int action = event.getAction();
615        action = action & MotionEvent.ACTION_MASK;
616
617        mGestureDetector.onTouchEvent(event);
618        boolean scaleInProgress = scaleInProgress();
619        mScaleGestureDetector.onTouchEvent(event);
620        if (mInteractionMode == InteractionMode.SCALE) {
621            return true;
622        }
623        if (!scaleInProgress() && scaleInProgress) {
624            // If we were scaling, the scale will stop but we will
625            // still issue an ACTION_UP. Let the subclasses know.
626            mFinishedScalingOperation = true;
627        }
628
629        int ex = (int) event.getX();
630        int ey = (int) event.getY();
631        if (action == MotionEvent.ACTION_DOWN) {
632            mInteractionMode = InteractionMode.MOVE;
633            mTouchDown.x = ex;
634            mTouchDown.y = ey;
635            mTouchShowOriginalDate = System.currentTimeMillis();
636            mShowOriginalDirection = 0;
637            MasterImage.getImage().setOriginalTranslation(MasterImage.getImage().getTranslation());
638        }
639
640        if (action == MotionEvent.ACTION_MOVE && mInteractionMode == InteractionMode.MOVE) {
641            mTouch.x = ex;
642            mTouch.y = ey;
643
644            float scaleFactor = MasterImage.getImage().getScaleFactor();
645            if (scaleFactor > 1 && (!ENABLE_ZOOMED_COMPARISON || event.getPointerCount() == 2)) {
646                float translateX = (mTouch.x - mTouchDown.x) / scaleFactor;
647                float translateY = (mTouch.y - mTouchDown.y) / scaleFactor;
648                Point originalTranslation = MasterImage.getImage().getOriginalTranslation();
649                Point translation = MasterImage.getImage().getTranslation();
650                translation.x = (int) (originalTranslation.x + translateX);
651                translation.y = (int) (originalTranslation.y + translateY);
652                MasterImage.getImage().setTranslation(translation);
653                mTouchShowOriginal = false;
654            } else if (enableComparison() && !mOriginalDisabled
655                    && (System.currentTimeMillis() - mTouchShowOriginalDate
656                            > mTouchShowOriginalDelayMin)
657                    && event.getPointerCount() == 1) {
658                mTouchShowOriginal = true;
659            }
660        }
661
662        if (action == MotionEvent.ACTION_UP
663                || action == MotionEvent.ACTION_CANCEL
664                || action == MotionEvent.ACTION_OUTSIDE) {
665            mInteractionMode = InteractionMode.NONE;
666            mTouchShowOriginal = false;
667            mTouchDown.x = 0;
668            mTouchDown.y = 0;
669            mTouch.x = 0;
670            mTouch.y = 0;
671            if (MasterImage.getImage().getScaleFactor() <= 1) {
672                MasterImage.getImage().setScaleFactor(1);
673                MasterImage.getImage().resetTranslation();
674            }
675        }
676
677        float scaleFactor = MasterImage.getImage().getScaleFactor();
678        Point translation = MasterImage.getImage().getTranslation();
679        constrainTranslation(translation, scaleFactor);
680        MasterImage.getImage().setTranslation(translation);
681
682        invalidate();
683        return true;
684    }
685
686    private void startAnimTranslation(int fromX, int toX,
687                                      int fromY, int toY, int delay) {
688        if (fromX == toX && fromY == toY) {
689            return;
690        }
691        if (mAnimatorTranslateX != null) {
692            mAnimatorTranslateX.cancel();
693        }
694        if (mAnimatorTranslateY != null) {
695            mAnimatorTranslateY.cancel();
696        }
697        mAnimatorTranslateX = ValueAnimator.ofInt(fromX, toX);
698        mAnimatorTranslateY = ValueAnimator.ofInt(fromY, toY);
699        mAnimatorTranslateX.setDuration(delay);
700        mAnimatorTranslateY.setDuration(delay);
701        mAnimatorTranslateX.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
702            @Override
703            public void onAnimationUpdate(ValueAnimator animation) {
704                Point translation = MasterImage.getImage().getTranslation();
705                translation.x = (Integer) animation.getAnimatedValue();
706                MasterImage.getImage().setTranslation(translation);
707                invalidate();
708            }
709        });
710        mAnimatorTranslateY.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
711            @Override
712            public void onAnimationUpdate(ValueAnimator animation) {
713                Point translation = MasterImage.getImage().getTranslation();
714                translation.y = (Integer) animation.getAnimatedValue();
715                MasterImage.getImage().setTranslation(translation);
716                invalidate();
717            }
718        });
719        mAnimatorTranslateX.start();
720        mAnimatorTranslateY.start();
721    }
722
723    private void applyTranslationConstraints() {
724        float scaleFactor = MasterImage.getImage().getScaleFactor();
725        Point translation = MasterImage.getImage().getTranslation();
726        int x = translation.x;
727        int y = translation.y;
728        constrainTranslation(translation, scaleFactor);
729
730        if (x != translation.x || y != translation.y) {
731            startAnimTranslation(x, translation.x,
732                                 y, translation.y,
733                                 mAnimationSnapDelay);
734        }
735    }
736
737    protected boolean enableComparison() {
738        return true;
739    }
740
741    @Override
742    public boolean onDoubleTap(MotionEvent arg0) {
743        mZoomIn = !mZoomIn;
744        float scale = 1.0f;
745        final float x = arg0.getX();
746        final float y = arg0.getY();
747        if (mZoomIn) {
748            scale = MasterImage.getImage().getMaxScaleFactor();
749        }
750        if (scale != MasterImage.getImage().getScaleFactor()) {
751            if (mAnimatorScale != null) {
752                mAnimatorScale.cancel();
753            }
754            mAnimatorScale = ValueAnimator.ofFloat(
755                    MasterImage.getImage().getScaleFactor(),
756                    scale
757            );
758            float translateX = (getWidth() / 2 - x);
759            float translateY = (getHeight() / 2 - y);
760            Point translation = MasterImage.getImage().getTranslation();
761            int startTranslateX = translation.x;
762            int startTranslateY = translation.y;
763            if (scale != 1.0f) {
764                translation.x = (int) (mOriginalTranslation.x + translateX);
765                translation.y = (int) (mOriginalTranslation.y + translateY);
766            } else {
767                translation.x = 0;
768                translation.y = 0;
769            }
770            constrainTranslation(translation, scale);
771
772            startAnimTranslation(startTranslateX, translation.x,
773                                 startTranslateY, translation.y,
774                                 mAnimationZoomDelay);
775            mAnimatorScale.setDuration(mAnimationZoomDelay);
776            mAnimatorScale.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
777                @Override
778                public void onAnimationUpdate(ValueAnimator animation) {
779                    MasterImage.getImage().setScaleFactor((Float) animation.getAnimatedValue());
780                    invalidate();
781                }
782            });
783            mAnimatorScale.addListener(new Animator.AnimatorListener() {
784                @Override
785                public void onAnimationStart(Animator animation) {
786                }
787
788                @Override
789                public void onAnimationEnd(Animator animation) {
790                    applyTranslationConstraints();
791                    MasterImage.getImage().needsUpdatePartialPreview();
792                    invalidate();
793                }
794
795                @Override
796                public void onAnimationCancel(Animator animation) {
797
798                }
799
800                @Override
801                public void onAnimationRepeat(Animator animation) {
802
803                }
804            });
805            mAnimatorScale.start();
806        }
807        return true;
808    }
809
810    private void constrainTranslation(Point translation, float scale) {
811        int currentEdgeEffect = 0;
812        if (scale <= 1) {
813            mCurrentEdgeEffect = 0;
814            mEdgeEffect.finish();
815            return;
816        }
817
818        Matrix originalToScreen = MasterImage.getImage().originalImageToScreen();
819        Rect originalBounds = MasterImage.getImage().getOriginalBounds();
820        RectF screenPos = new RectF(originalBounds);
821        originalToScreen.mapRect(screenPos);
822
823        boolean rightConstraint = screenPos.right < getWidth() - mShadowMargin;
824        boolean leftConstraint = screenPos.left > mShadowMargin;
825        boolean topConstraint = screenPos.top > mShadowMargin;
826        boolean bottomConstraint = screenPos.bottom < getHeight() - mShadowMargin;
827
828        if (screenPos.width() > getWidth()) {
829            if (rightConstraint && !leftConstraint) {
830                float tx = screenPos.right - translation.x * scale;
831                translation.x = (int) ((getWidth() - mShadowMargin - tx) / scale);
832                currentEdgeEffect = EDGE_RIGHT;
833            } else if (leftConstraint && !rightConstraint) {
834                float tx = screenPos.left - translation.x * scale;
835                translation.x = (int) ((mShadowMargin - tx) / scale);
836                currentEdgeEffect = EDGE_LEFT;
837            }
838        } else {
839            float tx = screenPos.right - translation.x * scale;
840            float dx = (getWidth() - 2 * mShadowMargin - screenPos.width()) / 2f;
841            translation.x = (int) ((getWidth() - mShadowMargin - tx - dx) / scale);
842        }
843
844        if (screenPos.height() > getHeight()) {
845            if (bottomConstraint && !topConstraint) {
846                float ty = screenPos.bottom - translation.y * scale;
847                translation.y = (int) ((getHeight() - mShadowMargin - ty) / scale);
848                currentEdgeEffect = EDGE_BOTTOM;
849            } else if (topConstraint && !bottomConstraint) {
850                float ty = screenPos.top - translation.y * scale;
851                translation.y = (int) ((mShadowMargin - ty) / scale);
852                currentEdgeEffect = EDGE_TOP;
853            }
854        } else {
855            float ty = screenPos.bottom - translation.y * scale;
856            float dy = (getHeight()- 2 * mShadowMargin - screenPos.height()) / 2f;
857            translation.y = (int) ((getHeight() - mShadowMargin - ty - dy) / scale);
858        }
859
860        if (mCurrentEdgeEffect != currentEdgeEffect) {
861            if (mCurrentEdgeEffect == 0 || currentEdgeEffect != 0) {
862                mCurrentEdgeEffect = currentEdgeEffect;
863                mEdgeEffect.finish();
864            }
865            mEdgeEffect.setSize(getWidth(), mEdgeSize);
866        }
867        if (currentEdgeEffect != 0) {
868            mEdgeEffect.onPull(mEdgeSize);
869        }
870    }
871
872    @Override
873    public boolean onDoubleTapEvent(MotionEvent arg0) {
874        return false;
875    }
876
877    @Override
878    public boolean onSingleTapConfirmed(MotionEvent arg0) {
879        return false;
880    }
881
882    @Override
883    public boolean onDown(MotionEvent arg0) {
884        return false;
885    }
886
887    @Override
888    public boolean onFling(MotionEvent startEvent, MotionEvent endEvent, float arg2, float arg3) {
889        if (mActivity == null) {
890            return false;
891        }
892        if (endEvent.getPointerCount() == 2) {
893            return false;
894        }
895        return true;
896    }
897
898    @Override
899    public void onLongPress(MotionEvent arg0) {
900    }
901
902    @Override
903    public boolean onScroll(MotionEvent arg0, MotionEvent arg1, float arg2, float arg3) {
904        return false;
905    }
906
907    @Override
908    public void onShowPress(MotionEvent arg0) {
909    }
910
911    @Override
912    public boolean onSingleTapUp(MotionEvent arg0) {
913        return false;
914    }
915
916    public boolean useUtilityPanel() {
917        return false;
918    }
919
920    public void openUtilityPanel(final LinearLayout accessoryViewList) {
921    }
922
923    @Override
924    public boolean onScale(ScaleGestureDetector detector) {
925        MasterImage img = MasterImage.getImage();
926        float scaleFactor = img.getScaleFactor();
927
928        scaleFactor = scaleFactor * detector.getScaleFactor();
929        if (scaleFactor > MasterImage.getImage().getMaxScaleFactor()) {
930            scaleFactor = MasterImage.getImage().getMaxScaleFactor();
931        }
932        if (scaleFactor < 1.0f) {
933            scaleFactor = 1.0f;
934        }
935        MasterImage.getImage().setScaleFactor(scaleFactor);
936        scaleFactor = img.getScaleFactor();
937        float focusx = detector.getFocusX();
938        float focusy = detector.getFocusY();
939        float translateX = (focusx - mStartFocusX) / scaleFactor;
940        float translateY = (focusy - mStartFocusY) / scaleFactor;
941        Point translation = MasterImage.getImage().getTranslation();
942        translation.x = (int) (mOriginalTranslation.x + translateX);
943        translation.y = (int) (mOriginalTranslation.y + translateY);
944        MasterImage.getImage().setTranslation(translation);
945        invalidate();
946        return true;
947    }
948
949    @Override
950    public boolean onScaleBegin(ScaleGestureDetector detector) {
951        Point pos = MasterImage.getImage().getTranslation();
952        mOriginalTranslation.x = pos.x;
953        mOriginalTranslation.y = pos.y;
954        mOriginalScale = MasterImage.getImage().getScaleFactor();
955        mStartFocusX = detector.getFocusX();
956        mStartFocusY = detector.getFocusY();
957        mInteractionMode = InteractionMode.SCALE;
958        return true;
959    }
960
961    @Override
962    public void onScaleEnd(ScaleGestureDetector detector) {
963        mInteractionMode = InteractionMode.NONE;
964        if (MasterImage.getImage().getScaleFactor() < 1) {
965            MasterImage.getImage().setScaleFactor(1);
966            invalidate();
967        }
968    }
969
970    public boolean didFinishScalingOperation() {
971        if (mFinishedScalingOperation) {
972            mFinishedScalingOperation = false;
973            return true;
974        }
975        return false;
976    }
977
978}
979