diff options
Diffstat (limited to 'org.fox.ttcomics/src/main/java/com')
13 files changed, 1510 insertions, 0 deletions
diff --git a/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/Compat.java b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/Compat.java new file mode 100644 index 0000000..d33c31c --- /dev/null +++ b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/Compat.java @@ -0,0 +1,39 @@ +/* + Copyright 2011, 2012 Chris Banes. + + 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.github.chrisbanes.photoview; + +import android.annotation.TargetApi; +import android.os.Build.VERSION; +import android.os.Build.VERSION_CODES; +import android.view.View; + +class Compat { + + private static final int SIXTY_FPS_INTERVAL = 1000 / 60; + + public static void postOnAnimation(View view, Runnable runnable) { + if (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN) { + postOnAnimationJellyBean(view, runnable); + } else { + view.postDelayed(runnable, SIXTY_FPS_INTERVAL); + } + } + + @TargetApi(16) + private static void postOnAnimationJellyBean(View view, Runnable runnable) { + view.postOnAnimation(runnable); + } +} diff --git a/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/CustomGestureDetector.java b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/CustomGestureDetector.java new file mode 100755 index 0000000..822754f --- /dev/null +++ b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/CustomGestureDetector.java @@ -0,0 +1,205 @@ +/* + Copyright 2011, 2012 Chris Banes. + <p/> + 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 + <p/> + http://www.apache.org/licenses/LICENSE-2.0 + <p/> + 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.github.chrisbanes.photoview; + +import android.content.Context; +import android.view.MotionEvent; +import android.view.ScaleGestureDetector; +import android.view.VelocityTracker; +import android.view.ViewConfiguration; + +/** + * Does a whole lot of gesture detecting. + */ +class CustomGestureDetector { + + private static final int INVALID_POINTER_ID = -1; + + private int mActivePointerId = INVALID_POINTER_ID; + private int mActivePointerIndex = 0; + private final ScaleGestureDetector mDetector; + + private VelocityTracker mVelocityTracker; + private boolean mIsDragging; + private float mLastTouchX; + private float mLastTouchY; + private final float mTouchSlop; + private final float mMinimumVelocity; + private OnGestureListener mListener; + + CustomGestureDetector(Context context, OnGestureListener listener) { + final ViewConfiguration configuration = ViewConfiguration + .get(context); + mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); + mTouchSlop = configuration.getScaledTouchSlop(); + + mListener = listener; + ScaleGestureDetector.OnScaleGestureListener mScaleListener = new ScaleGestureDetector.OnScaleGestureListener() { + + @Override + public boolean onScale(ScaleGestureDetector detector) { + float scaleFactor = detector.getScaleFactor(); + + if (Float.isNaN(scaleFactor) || Float.isInfinite(scaleFactor)) + return false; + + if (scaleFactor >= 0) { + mListener.onScale(scaleFactor, + detector.getFocusX(), detector.getFocusY()); + } + return true; + } + + @Override + public boolean onScaleBegin(ScaleGestureDetector detector) { + return true; + } + + @Override + public void onScaleEnd(ScaleGestureDetector detector) { + // NO-OP + } + }; + mDetector = new ScaleGestureDetector(context, mScaleListener); + } + + private float getActiveX(MotionEvent ev) { + try { + return ev.getX(mActivePointerIndex); + } catch (Exception e) { + return ev.getX(); + } + } + + private float getActiveY(MotionEvent ev) { + try { + return ev.getY(mActivePointerIndex); + } catch (Exception e) { + return ev.getY(); + } + } + + public boolean isScaling() { + return mDetector.isInProgress(); + } + + public boolean isDragging() { + return mIsDragging; + } + + public boolean onTouchEvent(MotionEvent ev) { + try { + mDetector.onTouchEvent(ev); + return processTouchEvent(ev); + } catch (IllegalArgumentException e) { + // Fix for support lib bug, happening when onDestroy is called + return true; + } + } + + private boolean processTouchEvent(MotionEvent ev) { + final int action = ev.getAction(); + switch (action & MotionEvent.ACTION_MASK) { + case MotionEvent.ACTION_DOWN: + mActivePointerId = ev.getPointerId(0); + + mVelocityTracker = VelocityTracker.obtain(); + if (null != mVelocityTracker) { + mVelocityTracker.addMovement(ev); + } + + mLastTouchX = getActiveX(ev); + mLastTouchY = getActiveY(ev); + mIsDragging = false; + break; + case MotionEvent.ACTION_MOVE: + final float x = getActiveX(ev); + final float y = getActiveY(ev); + final float dx = x - mLastTouchX, dy = y - mLastTouchY; + + if (!mIsDragging) { + // Use Pythagoras to see if drag length is larger than + // touch slop + mIsDragging = Math.sqrt((dx * dx) + (dy * dy)) >= mTouchSlop; + } + + if (mIsDragging) { + mListener.onDrag(dx, dy); + mLastTouchX = x; + mLastTouchY = y; + + if (null != mVelocityTracker) { + mVelocityTracker.addMovement(ev); + } + } + break; + case MotionEvent.ACTION_CANCEL: + mActivePointerId = INVALID_POINTER_ID; + // Recycle Velocity Tracker + if (null != mVelocityTracker) { + mVelocityTracker.recycle(); + mVelocityTracker = null; + } + break; + case MotionEvent.ACTION_UP: + mActivePointerId = INVALID_POINTER_ID; + if (mIsDragging) { + if (null != mVelocityTracker) { + mLastTouchX = getActiveX(ev); + mLastTouchY = getActiveY(ev); + + // Compute velocity within the last 1000ms + mVelocityTracker.addMovement(ev); + mVelocityTracker.computeCurrentVelocity(1000); + + final float vX = mVelocityTracker.getXVelocity(), vY = mVelocityTracker + .getYVelocity(); + + // If the velocity is greater than minVelocity, call + // listener + if (Math.max(Math.abs(vX), Math.abs(vY)) >= mMinimumVelocity) { + mListener.onFling(mLastTouchX, mLastTouchY, -vX, + -vY); + } + } + } + + // Recycle Velocity Tracker + if (null != mVelocityTracker) { + mVelocityTracker.recycle(); + mVelocityTracker = null; + } + break; + case MotionEvent.ACTION_POINTER_UP: + final int pointerIndex = Util.getPointerIndex(ev.getAction()); + final int pointerId = ev.getPointerId(pointerIndex); + if (pointerId == mActivePointerId) { + // This was our active pointer going up. Choose a new + // active pointer and adjust accordingly. + final int newPointerIndex = pointerIndex == 0 ? 1 : 0; + mActivePointerId = ev.getPointerId(newPointerIndex); + mLastTouchX = ev.getX(newPointerIndex); + mLastTouchY = ev.getY(newPointerIndex); + } + break; + } + + mActivePointerIndex = ev + .findPointerIndex(mActivePointerId != INVALID_POINTER_ID ? mActivePointerId + : 0); + return true; + } +} diff --git a/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnGestureListener.java b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnGestureListener.java new file mode 100644 index 0000000..f7722af --- /dev/null +++ b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnGestureListener.java @@ -0,0 +1,27 @@ +/* + Copyright 2011, 2012 Chris Banes. + + 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.github.chrisbanes.photoview; + +interface OnGestureListener { + + void onDrag(float dx, float dy); + + void onFling(float startX, float startY, float velocityX, + float velocityY); + + void onScale(float scaleFactor, float focusX, float focusY); + +}
\ No newline at end of file diff --git a/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnMatrixChangedListener.java b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnMatrixChangedListener.java new file mode 100644 index 0000000..f3031d6 --- /dev/null +++ b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnMatrixChangedListener.java @@ -0,0 +1,18 @@ +package com.github.chrisbanes.photoview; + +import android.graphics.RectF; + +/** + * Interface definition for a callback to be invoked when the internal Matrix has changed for + * this View. + */ +public interface OnMatrixChangedListener { + + /** + * Callback for when the Matrix displaying the Drawable has changed. This could be because + * the View's bounds have changed, or the user has zoomed. + * + * @param rect - Rectangle displaying the Drawable's new bounds. + */ + void onMatrixChanged(RectF rect); +} diff --git a/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnOutsidePhotoTapListener.java b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnOutsidePhotoTapListener.java new file mode 100644 index 0000000..99fc7b4 --- /dev/null +++ b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnOutsidePhotoTapListener.java @@ -0,0 +1,14 @@ +package com.github.chrisbanes.photoview; + +import android.widget.ImageView; + +/** + * Callback when the user tapped outside of the photo + */ +public interface OnOutsidePhotoTapListener { + + /** + * The outside of the photo has been tapped + */ + void onOutsidePhotoTap(ImageView imageView); +} diff --git a/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnPhotoTapListener.java b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnPhotoTapListener.java new file mode 100644 index 0000000..5f6f070 --- /dev/null +++ b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnPhotoTapListener.java @@ -0,0 +1,22 @@ +package com.github.chrisbanes.photoview; + +import android.widget.ImageView; + +/** + * A callback to be invoked when the Photo is tapped with a single + * tap. + */ +public interface OnPhotoTapListener { + + /** + * A callback to receive where the user taps on a photo. You will only receive a callback if + * the user taps on the actual photo, tapping on 'whitespace' will be ignored. + * + * @param view ImageView the user tapped. + * @param x where the user tapped from the of the Drawable, as percentage of the + * Drawable width. + * @param y where the user tapped from the top of the Drawable, as percentage of the + * Drawable height. + */ + void onPhotoTap(ImageView view, float x, float y); +} diff --git a/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnScaleChangedListener.java b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnScaleChangedListener.java new file mode 100644 index 0000000..c6bb7a6 --- /dev/null +++ b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnScaleChangedListener.java @@ -0,0 +1,17 @@ +package com.github.chrisbanes.photoview; + + +/** + * Interface definition for callback to be invoked when attached ImageView scale changes + */ +public interface OnScaleChangedListener { + + /** + * Callback for when the scale changes + * + * @param scaleFactor the scale factor (less than 1 for zoom out, greater than 1 for zoom in) + * @param focusX focal point X position + * @param focusY focal point Y position + */ + void onScaleChange(float scaleFactor, float focusX, float focusY); +} diff --git a/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnSingleFlingListener.java b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnSingleFlingListener.java new file mode 100644 index 0000000..f5dab92 --- /dev/null +++ b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnSingleFlingListener.java @@ -0,0 +1,21 @@ +package com.github.chrisbanes.photoview; + +import android.view.MotionEvent; + +/** + * A callback to be invoked when the ImageView is flung with a single + * touch + */ +public interface OnSingleFlingListener { + + /** + * A callback to receive where the user flings on a ImageView. You will receive a callback if + * the user flings anywhere on the view. + * + * @param e1 MotionEvent the user first touch. + * @param e2 MotionEvent the user last touch. + * @param velocityX distance of user's horizontal fling. + * @param velocityY distance of user's vertical fling. + */ + boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY); +} diff --git a/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnViewDragListener.java b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnViewDragListener.java new file mode 100644 index 0000000..66999a5 --- /dev/null +++ b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnViewDragListener.java @@ -0,0 +1,16 @@ +package com.github.chrisbanes.photoview; + +/** + * Interface definition for a callback to be invoked when the photo is experiencing a drag event + */ +public interface OnViewDragListener { + + /** + * Callback for when the photo is experiencing a drag event. This cannot be invoked when the + * user is scaling. + * + * @param dx The change of the coordinates in the x-direction + * @param dy The change of the coordinates in the y-direction + */ + void onDrag(float dx, float dy); +} diff --git a/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnViewTapListener.java b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnViewTapListener.java new file mode 100644 index 0000000..6856255 --- /dev/null +++ b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/OnViewTapListener.java @@ -0,0 +1,16 @@ +package com.github.chrisbanes.photoview; + +import android.view.View; + +public interface OnViewTapListener { + + /** + * A callback to receive where the user taps on a ImageView. You will receive a callback if + * the user taps anywhere on the view, tapping on 'whitespace' will not be ignored. + * + * @param view - View the user tapped. + * @param x - where the user tapped from the left of the View. + * @param y - where the user tapped from the top of the View. + */ + void onViewTap(View view, float x, float y); +} diff --git a/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/PhotoView.java b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/PhotoView.java new file mode 100644 index 0000000..8a8ba0a --- /dev/null +++ b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/PhotoView.java @@ -0,0 +1,256 @@ +/* + Copyright 2011, 2012 Chris Banes. + <p> + 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 + <p> + http://www.apache.org/licenses/LICENSE-2.0 + <p> + 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.github.chrisbanes.photoview; + +import android.content.Context; +import android.graphics.Matrix; +import android.graphics.RectF; +import android.graphics.drawable.Drawable; +import android.net.Uri; +import android.util.AttributeSet; +import android.view.GestureDetector; + +import androidx.appcompat.widget.AppCompatImageView; + +/** + * A zoomable ImageView. See {@link PhotoViewAttacher} for most of the details on how the zooming + * is accomplished + */ +@SuppressWarnings("unused") +public class PhotoView extends AppCompatImageView { + + private PhotoViewAttacher attacher; + private ScaleType pendingScaleType; + + public PhotoView(Context context) { + this(context, null); + } + + public PhotoView(Context context, AttributeSet attr) { + this(context, attr, 0); + } + + public PhotoView(Context context, AttributeSet attr, int defStyle) { + super(context, attr, defStyle); + init(); + } + + private void init() { + attacher = new PhotoViewAttacher(this); + //We always pose as a Matrix scale type, though we can change to another scale type + //via the attacher + super.setScaleType(ScaleType.MATRIX); + //apply the previously applied scale type + if (pendingScaleType != null) { + setScaleType(pendingScaleType); + pendingScaleType = null; + } + } + + /** + * Get the current {@link PhotoViewAttacher} for this view. Be wary of holding on to references + * to this attacher, as it has a reference to this view, which, if a reference is held in the + * wrong place, can cause memory leaks. + * + * @return the attacher. + */ + public PhotoViewAttacher getAttacher() { + return attacher; + } + + @Override + public ScaleType getScaleType() { + return attacher.getScaleType(); + } + + @Override + public Matrix getImageMatrix() { + return attacher.getImageMatrix(); + } + + @Override + public void setOnLongClickListener(OnLongClickListener l) { + attacher.setOnLongClickListener(l); + } + + @Override + public void setOnClickListener(OnClickListener l) { + attacher.setOnClickListener(l); + } + + @Override + public void setScaleType(ScaleType scaleType) { + if (attacher == null) { + pendingScaleType = scaleType; + } else { + attacher.setScaleType(scaleType); + } + } + + @Override + public void setImageDrawable(Drawable drawable) { + super.setImageDrawable(drawable); + // setImageBitmap calls through to this method + if (attacher != null) { + attacher.update(); + } + } + + @Override + public void setImageResource(int resId) { + super.setImageResource(resId); + if (attacher != null) { + attacher.update(); + } + } + + @Override + public void setImageURI(Uri uri) { + super.setImageURI(uri); + if (attacher != null) { + attacher.update(); + } + } + + @Override + protected boolean setFrame(int l, int t, int r, int b) { + boolean changed = super.setFrame(l, t, r, b); + if (changed) { + attacher.update(); + } + return changed; + } + + public void setRotationTo(float rotationDegree) { + attacher.setRotationTo(rotationDegree); + } + + public void setRotationBy(float rotationDegree) { + attacher.setRotationBy(rotationDegree); + } + + public boolean isZoomable() { + return attacher.isZoomable(); + } + + public void setZoomable(boolean zoomable) { + attacher.setZoomable(zoomable); + } + + public RectF getDisplayRect() { + return attacher.getDisplayRect(); + } + + public void getDisplayMatrix(Matrix matrix) { + attacher.getDisplayMatrix(matrix); + } + + @SuppressWarnings("UnusedReturnValue") public boolean setDisplayMatrix(Matrix finalRectangle) { + return attacher.setDisplayMatrix(finalRectangle); + } + + public void getSuppMatrix(Matrix matrix) { + attacher.getSuppMatrix(matrix); + } + + public boolean setSuppMatrix(Matrix matrix) { + return attacher.setDisplayMatrix(matrix); + } + + public float getMinimumScale() { + return attacher.getMinimumScale(); + } + + public float getMediumScale() { + return attacher.getMediumScale(); + } + + public float getMaximumScale() { + return attacher.getMaximumScale(); + } + + public float getScale() { + return attacher.getScale(); + } + + public void setAllowParentInterceptOnEdge(boolean allow) { + attacher.setAllowParentInterceptOnEdge(allow); + } + + public void setMinimumScale(float minimumScale) { + attacher.setMinimumScale(minimumScale); + } + + public void setMediumScale(float mediumScale) { + attacher.setMediumScale(mediumScale); + } + + public void setMaximumScale(float maximumScale) { + attacher.setMaximumScale(maximumScale); + } + + public void setScaleLevels(float minimumScale, float mediumScale, float maximumScale) { + attacher.setScaleLevels(minimumScale, mediumScale, maximumScale); + } + + public void setOnMatrixChangeListener(OnMatrixChangedListener listener) { + attacher.setOnMatrixChangeListener(listener); + } + + public void setOnPhotoTapListener(OnPhotoTapListener listener) { + attacher.setOnPhotoTapListener(listener); + } + + public void setOnOutsidePhotoTapListener(OnOutsidePhotoTapListener listener) { + attacher.setOnOutsidePhotoTapListener(listener); + } + + public void setOnViewTapListener(OnViewTapListener listener) { + attacher.setOnViewTapListener(listener); + } + + public void setOnViewDragListener(OnViewDragListener listener) { + attacher.setOnViewDragListener(listener); + } + + public void setScale(float scale) { + attacher.setScale(scale); + } + + public void setScale(float scale, boolean animate) { + attacher.setScale(scale, animate); + } + + public void setScale(float scale, float focalX, float focalY, boolean animate) { + attacher.setScale(scale, focalX, focalY, animate); + } + + public void setZoomTransitionDuration(int milliseconds) { + attacher.setZoomTransitionDuration(milliseconds); + } + + public void setOnDoubleTapListener(GestureDetector.OnDoubleTapListener onDoubleTapListener) { + attacher.setOnDoubleTapListener(onDoubleTapListener); + } + + public void setOnScaleChangeListener(OnScaleChangedListener onScaleChangedListener) { + attacher.setOnScaleChangeListener(onScaleChangedListener); + } + + public void setOnSingleFlingListener(OnSingleFlingListener onSingleFlingListener) { + attacher.setOnSingleFlingListener(onSingleFlingListener); + } +} diff --git a/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/PhotoViewAttacher.java b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/PhotoViewAttacher.java new file mode 100755 index 0000000..faf3491 --- /dev/null +++ b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/PhotoViewAttacher.java @@ -0,0 +1,822 @@ +/* + Copyright 2011, 2012 Chris Banes. + <p> + 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 + <p> + http://www.apache.org/licenses/LICENSE-2.0 + <p> + 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.github.chrisbanes.photoview; + +import android.content.Context; +import android.graphics.Matrix; +import android.graphics.Matrix.ScaleToFit; +import android.graphics.RectF; +import android.graphics.drawable.Drawable; +import android.view.GestureDetector; +import android.view.MotionEvent; +import android.view.View; +import android.view.View.OnLongClickListener; +import android.view.ViewParent; +import android.view.animation.AccelerateDecelerateInterpolator; +import android.view.animation.Interpolator; +import android.widget.ImageView; +import android.widget.ImageView.ScaleType; +import android.widget.OverScroller; + +/** + * The component of {@link PhotoView} which does the work allowing for zooming, scaling, panning, etc. + * It is made public in case you need to subclass something other than AppCompatImageView and still + * gain the functionality that {@link PhotoView} offers + */ +public class PhotoViewAttacher implements View.OnTouchListener, + View.OnLayoutChangeListener { + + private static float DEFAULT_MAX_SCALE = 3.0f; + private static float DEFAULT_MID_SCALE = 1.75f; + private static float DEFAULT_MIN_SCALE = 1.0f; + private static int DEFAULT_ZOOM_DURATION = 200; + + private static final int HORIZONTAL_EDGE_NONE = -1; + private static final int HORIZONTAL_EDGE_LEFT = 0; + private static final int HORIZONTAL_EDGE_RIGHT = 1; + private static final int HORIZONTAL_EDGE_BOTH = 2; + private static final int VERTICAL_EDGE_NONE = -1; + private static final int VERTICAL_EDGE_TOP = 0; + private static final int VERTICAL_EDGE_BOTTOM = 1; + private static final int VERTICAL_EDGE_BOTH = 2; + private static int SINGLE_TOUCH = 1; + + private Interpolator mInterpolator = new AccelerateDecelerateInterpolator(); + private int mZoomDuration = DEFAULT_ZOOM_DURATION; + private float mMinScale = DEFAULT_MIN_SCALE; + private float mMidScale = DEFAULT_MID_SCALE; + private float mMaxScale = DEFAULT_MAX_SCALE; + + private boolean mAllowParentInterceptOnEdge = true; + private boolean mBlockParentIntercept = false; + + private ImageView mImageView; + + // Gesture Detectors + private GestureDetector mGestureDetector; + private CustomGestureDetector mScaleDragDetector; + + // These are set so we don't keep allocating them on the heap + private final Matrix mBaseMatrix = new Matrix(); + private final Matrix mDrawMatrix = new Matrix(); + private final Matrix mSuppMatrix = new Matrix(); + private final RectF mDisplayRect = new RectF(); + private final float[] mMatrixValues = new float[9]; + + // Listeners + private OnMatrixChangedListener mMatrixChangeListener; + private OnPhotoTapListener mPhotoTapListener; + private OnOutsidePhotoTapListener mOutsidePhotoTapListener; + private OnViewTapListener mViewTapListener; + private View.OnClickListener mOnClickListener; + private OnLongClickListener mLongClickListener; + private OnScaleChangedListener mScaleChangeListener; + private OnSingleFlingListener mSingleFlingListener; + private OnViewDragListener mOnViewDragListener; + + private FlingRunnable mCurrentFlingRunnable; + private int mHorizontalScrollEdge = HORIZONTAL_EDGE_BOTH; + private int mVerticalScrollEdge = VERTICAL_EDGE_BOTH; + private float mBaseRotation; + + private boolean mZoomEnabled = true; + private ScaleType mScaleType = ScaleType.FIT_CENTER; + + private OnGestureListener onGestureListener = new OnGestureListener() { + @Override + public void onDrag(float dx, float dy) { + if (mScaleDragDetector.isScaling()) { + return; // Do not drag if we are already scaling + } + if (mOnViewDragListener != null) { + mOnViewDragListener.onDrag(dx, dy); + } + mSuppMatrix.postTranslate(dx, dy); + checkAndDisplayMatrix(); + + /* + * Here we decide whether to let the ImageView's parent to start taking + * over the touch event. + * + * First we check whether this function is enabled. We never want the + * parent to take over if we're scaling. We then check the edge we're + * on, and the direction of the scroll (i.e. if we're pulling against + * the edge, aka 'overscrolling', let the parent take over). + */ + ViewParent parent = mImageView.getParent(); + if (mAllowParentInterceptOnEdge && !mScaleDragDetector.isScaling() && !mBlockParentIntercept) { + if (mHorizontalScrollEdge == HORIZONTAL_EDGE_BOTH + || (mHorizontalScrollEdge == HORIZONTAL_EDGE_LEFT && dx >= 1f) + || (mHorizontalScrollEdge == HORIZONTAL_EDGE_RIGHT && dx <= -1f) + || (mVerticalScrollEdge == VERTICAL_EDGE_TOP && dy >= 1f) + || (mVerticalScrollEdge == VERTICAL_EDGE_BOTTOM && dy <= -1f)) { + if (parent != null) { + parent.requestDisallowInterceptTouchEvent(false); + } + } + } else { + if (parent != null) { + parent.requestDisallowInterceptTouchEvent(true); + } + } + } + + @Override + public void onFling(float startX, float startY, float velocityX, float velocityY) { + mCurrentFlingRunnable = new FlingRunnable(mImageView.getContext()); + mCurrentFlingRunnable.fling(getImageViewWidth(mImageView), + getImageViewHeight(mImageView), (int) velocityX, (int) velocityY); + mImageView.post(mCurrentFlingRunnable); + } + + @Override + public void onScale(float scaleFactor, float focusX, float focusY) { + if (getScale() < mMaxScale || scaleFactor < 1f) { + if (mScaleChangeListener != null) { + mScaleChangeListener.onScaleChange(scaleFactor, focusX, focusY); + } + mSuppMatrix.postScale(scaleFactor, scaleFactor, focusX, focusY); + checkAndDisplayMatrix(); + } + } + }; + + public PhotoViewAttacher(ImageView imageView) { + mImageView = imageView; + imageView.setOnTouchListener(this); + imageView.addOnLayoutChangeListener(this); + if (imageView.isInEditMode()) { + return; + } + mBaseRotation = 0.0f; + // Create Gesture Detectors... + mScaleDragDetector = new CustomGestureDetector(imageView.getContext(), onGestureListener); + mGestureDetector = new GestureDetector(imageView.getContext(), new GestureDetector.SimpleOnGestureListener() { + + // forward long click listener + @Override + public void onLongPress(MotionEvent e) { + if (mLongClickListener != null) { + mLongClickListener.onLongClick(mImageView); + } + } + + @Override + public boolean onFling(MotionEvent e1, MotionEvent e2, + float velocityX, float velocityY) { + if (mSingleFlingListener != null) { + if (getScale() > DEFAULT_MIN_SCALE) { + return false; + } + if (e1.getPointerCount() > SINGLE_TOUCH + || e2.getPointerCount() > SINGLE_TOUCH) { + return false; + } + return mSingleFlingListener.onFling(e1, e2, velocityX, velocityY); + } + return false; + } + }); + mGestureDetector.setOnDoubleTapListener(new GestureDetector.OnDoubleTapListener() { + @Override + public boolean onSingleTapConfirmed(MotionEvent e) { + if (mOnClickListener != null) { + mOnClickListener.onClick(mImageView); + } + final RectF displayRect = getDisplayRect(); + final float x = e.getX(), y = e.getY(); + if (mViewTapListener != null) { + mViewTapListener.onViewTap(mImageView, x, y); + } + if (displayRect != null) { + // Check to see if the user tapped on the photo + if (displayRect.contains(x, y)) { + float xResult = (x - displayRect.left) + / displayRect.width(); + float yResult = (y - displayRect.top) + / displayRect.height(); + if (mPhotoTapListener != null) { + mPhotoTapListener.onPhotoTap(mImageView, xResult, yResult); + } + return true; + } else { + if (mOutsidePhotoTapListener != null) { + mOutsidePhotoTapListener.onOutsidePhotoTap(mImageView); + } + } + } + return false; + } + + @Override + public boolean onDoubleTap(MotionEvent ev) { + try { + float scale = getScale(); + float x = ev.getX(); + float y = ev.getY(); + if (scale < getMediumScale()) { + setScale(getMediumScale(), x, y, true); + } else if (scale >= getMediumScale() && scale < getMaximumScale()) { + setScale(getMaximumScale(), x, y, true); + } else { + setScale(getMinimumScale(), x, y, true); + } + } catch (ArrayIndexOutOfBoundsException e) { + // Can sometimes happen when getX() and getY() is called + } + return true; + } + + @Override + public boolean onDoubleTapEvent(MotionEvent e) { + // Wait for the confirmed onDoubleTap() instead + return false; + } + }); + } + + public void setOnDoubleTapListener(GestureDetector.OnDoubleTapListener newOnDoubleTapListener) { + this.mGestureDetector.setOnDoubleTapListener(newOnDoubleTapListener); + } + + public void setOnScaleChangeListener(OnScaleChangedListener onScaleChangeListener) { + this.mScaleChangeListener = onScaleChangeListener; + } + + public void setOnSingleFlingListener(OnSingleFlingListener onSingleFlingListener) { + this.mSingleFlingListener = onSingleFlingListener; + } + + @Deprecated + public boolean isZoomEnabled() { + return mZoomEnabled; + } + + public RectF getDisplayRect() { + checkMatrixBounds(); + return getDisplayRect(getDrawMatrix()); + } + + public boolean setDisplayMatrix(Matrix finalMatrix) { + if (finalMatrix == null) { + throw new IllegalArgumentException("Matrix cannot be null"); + } + if (mImageView.getDrawable() == null) { + return false; + } + mSuppMatrix.set(finalMatrix); + checkAndDisplayMatrix(); + return true; + } + + public void setBaseRotation(final float degrees) { + mBaseRotation = degrees % 360; + update(); + setRotationBy(mBaseRotation); + checkAndDisplayMatrix(); + } + + public void setRotationTo(float degrees) { + mSuppMatrix.setRotate(degrees % 360); + checkAndDisplayMatrix(); + } + + public void setRotationBy(float degrees) { + mSuppMatrix.postRotate(degrees % 360); + checkAndDisplayMatrix(); + } + + public float getMinimumScale() { + return mMinScale; + } + + public float getMediumScale() { + return mMidScale; + } + + public float getMaximumScale() { + return mMaxScale; + } + + public float getScale() { + return (float) Math.sqrt((float) Math.pow(getValue(mSuppMatrix, Matrix.MSCALE_X), 2) + (float) Math.pow + (getValue(mSuppMatrix, Matrix.MSKEW_Y), 2)); + } + + public ScaleType getScaleType() { + return mScaleType; + } + + @Override + public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int + oldRight, int oldBottom) { + // Update our base matrix, as the bounds have changed + if (left != oldLeft || top != oldTop || right != oldRight || bottom != oldBottom) { + updateBaseMatrix(mImageView.getDrawable()); + } + } + + @Override + public boolean onTouch(View v, MotionEvent ev) { + boolean handled = false; + if (mZoomEnabled && Util.hasDrawable((ImageView) v)) { + switch (ev.getAction()) { + case MotionEvent.ACTION_DOWN: + ViewParent parent = v.getParent(); + // First, disable the Parent from intercepting the touch + // event + if (parent != null) { + parent.requestDisallowInterceptTouchEvent(true); + } + // If we're flinging, and the user presses down, cancel + // fling + cancelFling(); + break; + case MotionEvent.ACTION_CANCEL: + case MotionEvent.ACTION_UP: + // If the user has zoomed less than min scale, zoom back + // to min scale + if (getScale() < mMinScale) { + RectF rect = getDisplayRect(); + if (rect != null) { + v.post(new AnimatedZoomRunnable(getScale(), mMinScale, + rect.centerX(), rect.centerY())); + handled = true; + } + } else if (getScale() > mMaxScale) { + RectF rect = getDisplayRect(); + if (rect != null) { + v.post(new AnimatedZoomRunnable(getScale(), mMaxScale, + rect.centerX(), rect.centerY())); + handled = true; + } + } + break; + } + // Try the Scale/Drag detector + if (mScaleDragDetector != null) { + boolean wasScaling = mScaleDragDetector.isScaling(); + boolean wasDragging = mScaleDragDetector.isDragging(); + handled = mScaleDragDetector.onTouchEvent(ev); + boolean didntScale = !wasScaling && !mScaleDragDetector.isScaling(); + boolean didntDrag = !wasDragging && !mScaleDragDetector.isDragging(); + mBlockParentIntercept = didntScale && didntDrag; + } + // Check to see if the user double tapped + if (mGestureDetector != null && mGestureDetector.onTouchEvent(ev)) { + handled = true; + } + + } + return handled; + } + + public void setAllowParentInterceptOnEdge(boolean allow) { + mAllowParentInterceptOnEdge = allow; + } + + public void setMinimumScale(float minimumScale) { + Util.checkZoomLevels(minimumScale, mMidScale, mMaxScale); + mMinScale = minimumScale; + } + + public void setMediumScale(float mediumScale) { + Util.checkZoomLevels(mMinScale, mediumScale, mMaxScale); + mMidScale = mediumScale; + } + + public void setMaximumScale(float maximumScale) { + Util.checkZoomLevels(mMinScale, mMidScale, maximumScale); + mMaxScale = maximumScale; + } + + public void setScaleLevels(float minimumScale, float mediumScale, float maximumScale) { + Util.checkZoomLevels(minimumScale, mediumScale, maximumScale); + mMinScale = minimumScale; + mMidScale = mediumScale; + mMaxScale = maximumScale; + } + + public void setOnLongClickListener(OnLongClickListener listener) { + mLongClickListener = listener; + } + + public void setOnClickListener(View.OnClickListener listener) { + mOnClickListener = listener; + } + + public void setOnMatrixChangeListener(OnMatrixChangedListener listener) { + mMatrixChangeListener = listener; + } + + public void setOnPhotoTapListener(OnPhotoTapListener listener) { + mPhotoTapListener = listener; + } + + public void setOnOutsidePhotoTapListener(OnOutsidePhotoTapListener mOutsidePhotoTapListener) { + this.mOutsidePhotoTapListener = mOutsidePhotoTapListener; + } + + public void setOnViewTapListener(OnViewTapListener listener) { + mViewTapListener = listener; + } + + public void setOnViewDragListener(OnViewDragListener listener) { + mOnViewDragListener = listener; + } + + public void setScale(float scale) { + setScale(scale, false); + } + + public void setScale(float scale, boolean animate) { + setScale(scale, + (mImageView.getRight()) / 2, + (mImageView.getBottom()) / 2, + animate); + } + + public void setScale(float scale, float focalX, float focalY, + boolean animate) { + // Check to see if the scale is within bounds + if (scale < mMinScale || scale > mMaxScale) { + throw new IllegalArgumentException("Scale must be within the range of minScale and maxScale"); + } + if (animate) { + mImageView.post(new AnimatedZoomRunnable(getScale(), scale, + focalX, focalY)); + } else { + mSuppMatrix.setScale(scale, scale, focalX, focalY); + checkAndDisplayMatrix(); + } + } + + /** + * Set the zoom interpolator + * + * @param interpolator the zoom interpolator + */ + public void setZoomInterpolator(Interpolator interpolator) { + mInterpolator = interpolator; + } + + public void setScaleType(ScaleType scaleType) { + if (Util.isSupportedScaleType(scaleType) && scaleType != mScaleType) { + mScaleType = scaleType; + update(); + } + } + + public boolean isZoomable() { + return mZoomEnabled; + } + + public void setZoomable(boolean zoomable) { + mZoomEnabled = zoomable; + update(); + } + + public void update() { + if (mZoomEnabled) { + // Update the base matrix using the current drawable + updateBaseMatrix(mImageView.getDrawable()); + } else { + // Reset the Matrix... + resetMatrix(); + } + } + + /** + * Get the display matrix + * + * @param matrix target matrix to copy to + */ + public void getDisplayMatrix(Matrix matrix) { + matrix.set(getDrawMatrix()); + } + + /** + * Get the current support matrix + */ + public void getSuppMatrix(Matrix matrix) { + matrix.set(mSuppMatrix); + } + + private Matrix getDrawMatrix() { + mDrawMatrix.set(mBaseMatrix); + mDrawMatrix.postConcat(mSuppMatrix); + return mDrawMatrix; + } + + public Matrix getImageMatrix() { + return mDrawMatrix; + } + + public void setZoomTransitionDuration(int milliseconds) { + this.mZoomDuration = milliseconds; + } + + /** + * Helper method that 'unpacks' a Matrix and returns the required value + * + * @param matrix Matrix to unpack + * @param whichValue Which value from Matrix.M* to return + * @return returned value + */ + private float getValue(Matrix matrix, int whichValue) { + matrix.getValues(mMatrixValues); + return mMatrixValues[whichValue]; + } + + /** + * Resets the Matrix back to FIT_CENTER, and then displays its contents + */ + private void resetMatrix() { + mSuppMatrix.reset(); + setRotationBy(mBaseRotation); + setImageViewMatrix(getDrawMatrix()); + checkMatrixBounds(); + } + + private void setImageViewMatrix(Matrix matrix) { + mImageView.setImageMatrix(matrix); + // Call MatrixChangedListener if needed + if (mMatrixChangeListener != null) { + RectF displayRect = getDisplayRect(matrix); + if (displayRect != null) { + mMatrixChangeListener.onMatrixChanged(displayRect); + } + } + } + + /** + * Helper method that simply checks the Matrix, and then displays the result + */ + private void checkAndDisplayMatrix() { + if (checkMatrixBounds()) { + setImageViewMatrix(getDrawMatrix()); + } + } + + /** + * Helper method that maps the supplied Matrix to the current Drawable + * + * @param matrix - Matrix to map Drawable against + * @return RectF - Displayed Rectangle + */ + private RectF getDisplayRect(Matrix matrix) { + Drawable d = mImageView.getDrawable(); + if (d != null) { + mDisplayRect.set(0, 0, d.getIntrinsicWidth(), + d.getIntrinsicHeight()); + matrix.mapRect(mDisplayRect); + return mDisplayRect; + } + return null; + } + + /** + * Calculate Matrix for FIT_CENTER + * + * @param drawable - Drawable being displayed + */ + private void updateBaseMatrix(Drawable drawable) { + if (drawable == null) { + return; + } + final float viewWidth = getImageViewWidth(mImageView); + final float viewHeight = getImageViewHeight(mImageView); + final int drawableWidth = drawable.getIntrinsicWidth(); + final int drawableHeight = drawable.getIntrinsicHeight(); + mBaseMatrix.reset(); + final float widthScale = viewWidth / drawableWidth; + final float heightScale = viewHeight / drawableHeight; + if (mScaleType == ScaleType.CENTER) { + mBaseMatrix.postTranslate((viewWidth - drawableWidth) / 2F, + (viewHeight - drawableHeight) / 2F); + + } else if (mScaleType == ScaleType.CENTER_CROP) { + float scale = Math.max(widthScale, heightScale); + mBaseMatrix.postScale(scale, scale); + + /*mBaseMatrix.postTranslate((viewWidth - drawableWidth * scale) / 2F, + (viewHeight - drawableHeight * scale) / 2F);*/ + + // FOX: make CENTER_CROP act like TOP_CROP + mBaseMatrix.postTranslate((viewWidth - drawableWidth * scale) / 2F, + 0); + + } else if (mScaleType == ScaleType.CENTER_INSIDE) { + float scale = Math.min(1.0f, Math.min(widthScale, heightScale)); + mBaseMatrix.postScale(scale, scale); + mBaseMatrix.postTranslate((viewWidth - drawableWidth * scale) / 2F, + (viewHeight - drawableHeight * scale) / 2F); + + } else { + RectF mTempSrc = new RectF(0, 0, drawableWidth, drawableHeight); + RectF mTempDst = new RectF(0, 0, viewWidth, viewHeight); + if ((int) mBaseRotation % 180 != 0) { + mTempSrc = new RectF(0, 0, drawableHeight, drawableWidth); + } + switch (mScaleType) { + case FIT_CENTER: + mBaseMatrix.setRectToRect(mTempSrc, mTempDst, ScaleToFit.CENTER); + break; + case FIT_START: + mBaseMatrix.setRectToRect(mTempSrc, mTempDst, ScaleToFit.START); + break; + case FIT_END: + mBaseMatrix.setRectToRect(mTempSrc, mTempDst, ScaleToFit.END); + break; + case FIT_XY: + mBaseMatrix.setRectToRect(mTempSrc, mTempDst, ScaleToFit.FILL); + break; + default: + break; + } + } + resetMatrix(); + } + + private boolean checkMatrixBounds() { + final RectF rect = getDisplayRect(getDrawMatrix()); + if (rect == null) { + return false; + } + final float height = rect.height(), width = rect.width(); + float deltaX = 0, deltaY = 0; + final int viewHeight = getImageViewHeight(mImageView); + if (height <= viewHeight) { + switch (mScaleType) { + case FIT_START: + deltaY = -rect.top; + break; + case FIT_END: + deltaY = viewHeight - height - rect.top; + break; + default: + deltaY = (viewHeight - height) / 2 - rect.top; + break; + } + mVerticalScrollEdge = VERTICAL_EDGE_BOTH; + } else if (rect.top > 0) { + mVerticalScrollEdge = VERTICAL_EDGE_TOP; + deltaY = -rect.top; + } else if (rect.bottom < viewHeight) { + mVerticalScrollEdge = VERTICAL_EDGE_BOTTOM; + deltaY = viewHeight - rect.bottom; + } else { + mVerticalScrollEdge = VERTICAL_EDGE_NONE; + } + final int viewWidth = getImageViewWidth(mImageView); + if (width <= viewWidth) { + switch (mScaleType) { + case FIT_START: + deltaX = -rect.left; + break; + case FIT_END: + deltaX = viewWidth - width - rect.left; + break; + default: + deltaX = (viewWidth - width) / 2 - rect.left; + break; + } + mHorizontalScrollEdge = HORIZONTAL_EDGE_BOTH; + } else if (rect.left > 0) { + mHorizontalScrollEdge = HORIZONTAL_EDGE_LEFT; + deltaX = -rect.left; + } else if (rect.right < viewWidth) { + deltaX = viewWidth - rect.right; + mHorizontalScrollEdge = HORIZONTAL_EDGE_RIGHT; + } else { + mHorizontalScrollEdge = HORIZONTAL_EDGE_NONE; + } + // Finally actually translate the matrix + mSuppMatrix.postTranslate(deltaX, deltaY); + return true; + } + + private int getImageViewWidth(ImageView imageView) { + return imageView.getWidth() - imageView.getPaddingLeft() - imageView.getPaddingRight(); + } + + private int getImageViewHeight(ImageView imageView) { + return imageView.getHeight() - imageView.getPaddingTop() - imageView.getPaddingBottom(); + } + + private void cancelFling() { + if (mCurrentFlingRunnable != null) { + mCurrentFlingRunnable.cancelFling(); + mCurrentFlingRunnable = null; + } + } + + private class AnimatedZoomRunnable implements Runnable { + + private final float mFocalX, mFocalY; + private final long mStartTime; + private final float mZoomStart, mZoomEnd; + + public AnimatedZoomRunnable(final float currentZoom, final float targetZoom, + final float focalX, final float focalY) { + mFocalX = focalX; + mFocalY = focalY; + mStartTime = System.currentTimeMillis(); + mZoomStart = currentZoom; + mZoomEnd = targetZoom; + } + + @Override + public void run() { + float t = interpolate(); + float scale = mZoomStart + t * (mZoomEnd - mZoomStart); + float deltaScale = scale / getScale(); + onGestureListener.onScale(deltaScale, mFocalX, mFocalY); + // We haven't hit our target scale yet, so post ourselves again + if (t < 1f) { + Compat.postOnAnimation(mImageView, this); + } + } + + private float interpolate() { + float t = 1f * (System.currentTimeMillis() - mStartTime) / mZoomDuration; + t = Math.min(1f, t); + t = mInterpolator.getInterpolation(t); + return t; + } + } + + private class FlingRunnable implements Runnable { + + private final OverScroller mScroller; + private int mCurrentX, mCurrentY; + + public FlingRunnable(Context context) { + mScroller = new OverScroller(context); + } + + public void cancelFling() { + mScroller.forceFinished(true); + } + + public void fling(int viewWidth, int viewHeight, int velocityX, + int velocityY) { + final RectF rect = getDisplayRect(); + if (rect == null) { + return; + } + final int startX = Math.round(-rect.left); + final int minX, maxX, minY, maxY; + if (viewWidth < rect.width()) { + minX = 0; + maxX = Math.round(rect.width() - viewWidth); + } else { + minX = maxX = startX; + } + final int startY = Math.round(-rect.top); + if (viewHeight < rect.height()) { + minY = 0; + maxY = Math.round(rect.height() - viewHeight); + } else { + minY = maxY = startY; + } + mCurrentX = startX; + mCurrentY = startY; + // If we actually can move, fling the scroller + if (startX != maxX || startY != maxY) { + mScroller.fling(startX, startY, velocityX, velocityY, minX, + maxX, minY, maxY, 0, 0); + } + } + + @Override + public void run() { + if (mScroller.isFinished()) { + return; // remaining post that should not be handled + } + if (mScroller.computeScrollOffset()) { + final int newX = mScroller.getCurrX(); + final int newY = mScroller.getCurrY(); + mSuppMatrix.postTranslate(mCurrentX - newX, mCurrentY - newY); + checkAndDisplayMatrix(); + mCurrentX = newX; + mCurrentY = newY; + // Post On animation + Compat.postOnAnimation(mImageView, this); + } + } + } +} diff --git a/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/Util.java b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/Util.java new file mode 100644 index 0000000..2e3e5ad --- /dev/null +++ b/org.fox.ttcomics/src/main/java/com/github/chrisbanes/photoview/Util.java @@ -0,0 +1,37 @@ +package com.github.chrisbanes.photoview; + +import android.view.MotionEvent; +import android.widget.ImageView; + +class Util { + + static void checkZoomLevels(float minZoom, float midZoom, + float maxZoom) { + if (minZoom >= midZoom) { + throw new IllegalArgumentException( + "Minimum zoom has to be less than Medium zoom. Call setMinimumZoom() with a more appropriate value"); + } else if (midZoom >= maxZoom) { + throw new IllegalArgumentException( + "Medium zoom has to be less than Maximum zoom. Call setMaximumZoom() with a more appropriate value"); + } + } + + static boolean hasDrawable(ImageView imageView) { + return imageView.getDrawable() != null; + } + + static boolean isSupportedScaleType(final ImageView.ScaleType scaleType) { + if (scaleType == null) { + return false; + } + switch (scaleType) { + case MATRIX: + throw new IllegalStateException("Matrix scale type is not supported"); + } + return true; + } + + static int getPointerIndex(int action) { + return (action & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT; + } +} |