Java tutorial
/******************************************************************************* * 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.huyn.demogroup.freechild; import android.content.Context; import android.graphics.RectF; import android.support.v4.view.MotionEventCompat; import android.view.GestureDetector; import android.view.MotionEvent; import android.view.View; import android.view.ViewParent; import android.view.animation.AccelerateDecelerateInterpolator; import android.view.animation.Interpolator; import android.widget.ImageView; import android.widget.OverScroller; import com.huyn.demogroup.leaveblank.Compat; import com.huyn.demogroup.leaveblank.CustomGestureDetector; import com.huyn.demogroup.leaveblank.OnAnimEndListener; import com.huyn.demogroup.leaveblank.OnGestureListener; import com.huyn.demogroup.leaveblank.OnScaleChangedListener; import com.huyn.demogroup.leaveblank.OnSingleFlingListener; import com.huyn.demogroup.leaveblank.PhotoView; import com.huyn.demogroup.leaveblank.Util; /** * 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 {@link ImageView} and still * gain the functionality that {@link PhotoView} offers */ public class FixedViewAttacher implements View.OnTouchListener, OnGestureListener, View.OnLayoutChangeListener { private static float DEFAULT_MAX_SCALE = 3.0f; private static float DEFAULT_MID_SCALE = 1.75f; private static float DEFAULT_MIN_SCALE = 0.1f; private static int DEFAULT_ZOOM_DURATION = 200; private static final int EDGE_NONE = -1; private static final int EDGE_LEFT = 0; private static final int EDGE_RIGHT = 1; private static final int 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; // Listeners private OnScaleChangedListener mScaleChangeListener; private OnSingleFlingListener mSingleFlingListener; private FlingRunnable mCurrentFlingRunnable; private int mScrollEdge = EDGE_BOTH; private boolean mStable = false; private boolean mZoomEnabled = true; public FixedViewAttacher(ImageView imageView) { mImageView = imageView; if (imageView.isInEditMode()) { return; } View parent = (View) mImageView.getParent(); parent.setOnTouchListener(this); parent.addOnLayoutChangeListener(this); // Create Gesture Detectors... mScaleDragDetector = new CustomGestureDetector(imageView.getContext(), this); mGestureDetector = new GestureDetector(imageView.getContext(), new GestureDetector.SimpleOnGestureListener() { @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { if (mSingleFlingListener != null) { if (getScale() > DEFAULT_MIN_SCALE) { return false; } if (MotionEventCompat.getPointerCount(e1) > SINGLE_TOUCH || MotionEventCompat.getPointerCount(e2) > SINGLE_TOUCH) { return false; } return mSingleFlingListener.onFling(e1, e2, velocityX, velocityY); } return false; } }); } 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 getVisibleRect(); } public float getMinimumScale() { return mMinScale; } public float getMediumScale() { return mMidScale; } public float getMaximumScale() { return mMaxScale; } public float getScale() { return mImageView.getScaleX(); } @Override public void onDrag(float dx, float dy) { if (mScaleDragDetector.isScaling()) { return; // Do not drag if we are already scaling } System.out.println("++++ondrag:" + dx + "/" + dy); 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 (mScrollEdge == EDGE_BOTH || (mScrollEdge == EDGE_LEFT && dx >= 1f) || (mScrollEdge == EDGE_RIGHT && dx <= -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 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 System.out.println("===========onLayoutChange.updateBaseMatrix"); updateBaseMatrix(); } @Override public void onScale(float scaleFactor, float focusX, float focusY) { System.out.println("+++++++scaleFactor:" + scaleFactor + "/" + getScale()); if ((getScale() < mMaxScale || scaleFactor < 1f) && (getScale() > mMinScale || scaleFactor > 1f)) { if (mScaleChangeListener != null) { mScaleChangeListener.onScaleChange(scaleFactor, focusX, focusY); } doScale(scaleFactor); checkAndDisplayMatrix(); } } /** * TODO * @param scaleFactor */ private void doScale(float scaleFactor) { float scale = scaleFactor * getScale(); mImageView.setScaleX(scale); mImageView.setScaleY(scale); System.out.println("++++current scale:" + scale); } /** * TODO * @param dx * @param dy */ private void postTranslate(float dx, float dy) { float tx = mImageView.getTranslationX(); float ty = mImageView.getTranslationY(); tx += dx; ty += dy; mImageView.setTranslationX(tx); mImageView.setTranslationY(ty); System.out.println("+++++current tx:" + tx + "/ty:" + ty); } @Override public boolean onTouch(View v, MotionEvent ev) { boolean handled = false; if (mZoomEnabled) { 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(), null)); 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 setScale(float scale) { setScale(scale, false); } public void setScale(float scale, boolean animate) { setScale(scale, (mImageView.getRight()) / 2, (mImageView.getBottom()) / 2, animate, null); } public void setScale(float scale, boolean animate, OnAnimEndListener listener) { setScale(scale, (mImageView.getRight()) / 2, (mImageView.getBottom()) / 2, animate, listener); } public void setScale(float scale, float focalX, float focalY, boolean animate) { setScale(scale, focalX, focalY, animate, null); } public void setScale(float scale, float focalX, float focalY, boolean animate, OnAnimEndListener listener) { // 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, listener)); } else { doScale(scale); checkAndDisplayMatrix(); } } public void setStable(boolean stable) { mStable = stable; //update(); } public boolean getStable() { return mStable; } /** * Set the zoom interpolator * * @param interpolator the zoom interpolator */ public void setZoomInterpolator(Interpolator interpolator) { mInterpolator = interpolator; } public boolean isZoomable() { return mZoomEnabled; } public void setZoomable(boolean zoomable) { mZoomEnabled = zoomable; update(); } public void update() { System.out.println("===========update.updateBaseMatrix"); if (mZoomEnabled) { // Update the base matrix using the current drawable updateBaseMatrix(); } else { // Reset the Matrix... resetMatrix(); } } public void setZoomTransitionDuration(int milliseconds) { this.mZoomDuration = milliseconds; } /** * Resets the Matrix back to FIT_CENTER, and then displays its contents */ private void resetMatrix() { checkMatrixBounds(); } /** * Helper method that simply checks the Matrix, and then displays the result */ private void checkAndDisplayMatrix() { if (checkMatrixBounds()) { } } /** * Helper method that maps the supplied Matrix to the current Drawable * * @return RectF - Displayed Rectangle */ private RectF getVisibleRect() { /*View parent = (View) mImageView.getParent(); RectF mDisplayRect = new RectF(); Rect mResult = new Rect(); //parent.getGlobalVisibleRect(mResult); parent.getLocalVisibleRect(mResult); mDisplayRect.set(mResult);*/ RectF mDisplayRect = new RectF(); float tx = mImageView.getTranslationX(); float ty = mImageView.getTranslationY(); mDisplayRect.set(tx, ty, tx + mImageView.getWidth(), ty + mImageView.getHeight()); return mDisplayRect; } /** * Calculate Matrix for FIT_CENTER */ private void updateBaseMatrix() { final float viewWidth = getImageViewWidth(mImageView); final float viewHeight = getImageViewHeight(mImageView); View parent = (View) mImageView.getParent(); final int parentWidth = parent.getWidth(); final int parentHeight = parent.getHeight(); final float widthScale = parentWidth / viewWidth; final float heightScale = parentHeight / viewHeight; System.out.println("+++++++++++++++++++++++++++++++++++++++++++++++++"); System.out.println("++++++widthScale:" + widthScale + "/heightScale:" + heightScale); System.out.println("++++++viewWidth:" + viewWidth + "/viewHeight:" + viewHeight); System.out.println("++++++parentWidth:" + parentWidth + "/parentHeight:" + parentHeight); float scale = Math.max(widthScale, heightScale); System.out.println("++++scale:" + scale); doScale(scale); float tx = (parentWidth - viewWidth * scale) / 2F; float ty = (parentHeight - viewHeight * scale) / 2F; System.out.println("++++tx:" + tx + "/ty:" + ty); // postTranslate(tx, ty); mImageView.setTranslationX(tx); mImageView.setTranslationY(ty); resetMatrix(); } private boolean checkMatrixBounds() { final RectF rect = getVisibleRect(); if (rect == null) { return false; } RectF src = new RectF(); src.set(rect); final float h = rect.height(), w = rect.width(); float deltaX = 0, deltaY = 0; View parent = (View) mImageView.getParent(); final int viewHeight = parent.getHeight();//getImageViewHeight(mImageView); final int viewWidth = parent.getWidth();//getImageViewWidth(mImageView); System.out.println("===============================================width:" + viewWidth + "/" + viewHeight); System.out .println("+++++++++rect.left:" + rect.left + "/" + rect.top + "/" + rect.right + "/" + rect.bottom); float scale = getScale(); float centerX = rect.centerX(); float centerY = rect.centerY(); float targetW = w * scale; float targetH = h * scale; RectF targetRect = new RectF(centerX - targetW / 2, centerY - targetH / 2, centerX + targetW / 2, centerY + targetH / 2); rect.set(targetRect); final float height = rect.height(), width = rect.width(); if (height <= viewHeight) { deltaY = (viewHeight - height) / 2 - rect.top; } else if (rect.top > 0) { deltaY = -rect.top; } else if (rect.bottom < viewHeight) { deltaY = viewHeight - rect.bottom; } if (width <= viewWidth) { deltaX = (viewWidth - width) / 2 - rect.left; mScrollEdge = EDGE_BOTH; } else if (rect.left > 0) { mScrollEdge = EDGE_LEFT; deltaX = -rect.left; } else if (rect.right < viewWidth) { deltaX = viewWidth - rect.right; mScrollEdge = EDGE_RIGHT; } else { mScrollEdge = EDGE_NONE; } // Finally actually translate the matrix if (!mStable) { System.out.println("+++++++++++deltaX:" + deltaX + "/deltaY:" + deltaY + "---" + getScale()); 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; private final OnAnimEndListener mListener; public AnimatedZoomRunnable(final float currentZoom, final float targetZoom, final float focalX, final float focalY, final OnAnimEndListener listener) { mFocalX = focalX; mFocalY = focalY; mStartTime = System.currentTimeMillis(); mZoomStart = currentZoom; mZoomEnd = targetZoom; mListener = listener; } @Override public void run() { float t = interpolate(); float scale = mZoomStart + t * (mZoomEnd - mZoomStart); float deltaScale = scale / getScale(); onScale(deltaScale, mFocalX, mFocalY); System.out.println("+++++++scale:" + scale + "/end:" + mZoomEnd + "---t:" + t); // We haven't hit our target scale yet, so post ourselves again if (t < 1f) { Compat.postOnAnimation(mImageView, this); } else if (mListener != null) { mImageView.post(new Runnable() { @Override public void run() { mListener.onAnimEnd(); } }); } } 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(); // // postTranslate(mCurrentX - newX, mCurrentY - newY); // // mCurrentX = newX; // mCurrentY = newY; // // // Post On animation // Compat.postOnAnimation(mImageView, this); // } } } }