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RecyclerViewDragDropManager.java
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RecyclerViewDragDropManager.java
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/*
* Copyright (C) 2015 Haruki Hasegawa
*
* 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.h6ah4i.android.widget.advrecyclerview.draggable;
import android.graphics.Rect;
import android.graphics.drawable.NinePatchDrawable;
import android.os.Build;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.MotionEventCompat;
import android.support.v4.view.ViewCompat;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Interpolator;
import com.h6ah4i.android.widget.advrecyclerview.event.RecyclerViewOnScrollEventDistributor;
import com.h6ah4i.android.widget.advrecyclerview.utils.CustomRecyclerViewUtils;
import com.h6ah4i.android.widget.advrecyclerview.utils.WrapperAdapterUtils;
import java.lang.ref.WeakReference;
/**
* Provides item drag & drop operation for {@link android.support.v7.widget.RecyclerView}
*/
@SuppressWarnings("PointlessBitwiseExpression")
public class RecyclerViewDragDropManager {
private static final String TAG = "ARVDragDropManager";
/**
* State flag for the {@link DraggableItemViewHolder#setDragStateFlags(int)} and {@link DraggableItemViewHolder#getDragStateFlags()} methods.
* Indicates that currently performing dragging.
*/
public static final int STATE_FLAG_DRAGGING = (1 << 0);
/**
* State flag for the {@link DraggableItemViewHolder#setDragStateFlags(int)} and {@link DraggableItemViewHolder#getDragStateFlags()} methods.
* Indicates that this item is being dragged.
*/
public static final int STATE_FLAG_IS_ACTIVE = (1 << 1);
/**
* State flag for the {@link DraggableItemViewHolder#setDragStateFlags(int)} and {@link DraggableItemViewHolder#getDragStateFlags()} methods.
* Indicates that this item is in the range of drag-sortable items
*/
public static final int STATE_FLAG_IS_IN_RANGE = (1 << 2);
/**
* State flag for the {@link DraggableItemViewHolder#setDragStateFlags(int)} and {@link DraggableItemViewHolder#getDragStateFlags()} methods.
* If this flag is set, some other flags are changed and require to apply.
*/
public static final int STATE_FLAG_IS_UPDATED = (1 << 31);
// ---
/**
* Default interpolator used for "swap target transition"
*/
public static final Interpolator DEFAULT_SWAP_TARGET_TRANSITION_INTERPOLATOR = new BasicSwapTargetTranslationInterpolator();
/**
* Default interpolator used for "item settle back into place" animation
*/
public static final Interpolator DEFAULT_ITEM_SETTLE_BACK_INTO_PLACE_ANIMATION_INTERPOLATOR = new DecelerateInterpolator();
// ---
/**
* Used for listening item drag events
*/
public interface OnItemDragEventListener {
/**
* Callback method to be invoked when dragging is started.
*
* @param position The position of the item.
*/
void onItemDragStarted(int position);
/**
* Callback method to be invoked when dragging is finished.
*
* @param fromPosition Previous position of the item.
* @param toPosition New position of the item.
* @param result Indicates whether the dragging operation was succeeded.
*/
void onItemDragFinished(int fromPosition, int toPosition, boolean result);
}
// --
private static final int SCROLL_DIR_NONE = 0;
private static final int SCROLL_DIR_UP = (1 << 0);
private static final int SCROLL_DIR_DOWN = (1 << 1);
private static final boolean LOCAL_LOGV = false;
private static final boolean LOCAL_LOGD = false;
private static final float SCROLL_THRESHOLD = 0.3f; // 0.0f < X < 0.5f
private static final float SCROLL_AMOUNT_COEFF = 25;
private static final float SCROLL_TOUCH_SLOP_MULTIPLY = 1.5f;
private RecyclerView mRecyclerView;
private Interpolator mSwapTargetTranslationInterpolator = DEFAULT_SWAP_TARGET_TRANSITION_INTERPOLATOR;
private ScrollOnDraggingProcessRunnable mScrollOnDraggingProcess;
private boolean mScrollEventRegisteredToDistributor;
private RecyclerView.OnItemTouchListener mInternalUseOnItemTouchListener;
private RecyclerView.OnScrollListener mInternalUseOnScrollListener;
private EdgeEffectDecorator mEdgeEffectDecorator;
private NinePatchDrawable mShadowDrawable;
private float mDisplayDensity;
private int mTouchSlop;
private int mScrollTouchSlop;
private int mInitialTouchY;
private long mInitialTouchItemId = RecyclerView.NO_ID;
private boolean mInitiateOnLongPress;
private boolean mInitiateOnMove = true;
private boolean mInScrollByMethod;
private int mActualScrollByAmount;
private Rect mTmpRect1 = new Rect();
private Runnable mDeferredCancelProcess;
private int mItemSettleBackIntoPlaceAnimationDuration = 200;
private Interpolator mItemSettleBackIntoPlaceAnimationInterpolator = DEFAULT_ITEM_SETTLE_BACK_INTO_PLACE_ANIMATION_INTERPOLATOR;
// these fields are only valid while dragging
private DraggableItemWrapperAdapter mAdapter;
private long mDraggingItemId = RecyclerView.NO_ID;
private RecyclerView.ViewHolder mDraggingItem;
private Rect mDraggingItemMargins = new Rect();
private DraggingItemDecorator mDraggingItemDecorator;
private SwapTargetItemOperator mSwapTargetItemOperator;
private int mLastTouchY;
private int mDragStartTouchY;
private int mDragMinTouchY;
private int mDragMaxTouchY;
private int mScrollDirMask = SCROLL_DIR_NONE;
private int mGrabbedPositionY;
private int mGrabbedItemHeight;
private int mOrigOverScrollMode;
private ItemDraggableRange mDraggableRange;
private InternalHandler mHandler;
private OnItemDragEventListener mItemDragEventListener;
/**
* Constructor.
*/
public RecyclerViewDragDropManager() {
mInternalUseOnItemTouchListener = new RecyclerView.OnItemTouchListener() {
@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
return RecyclerViewDragDropManager.this.onInterceptTouchEvent(rv, e);
}
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
RecyclerViewDragDropManager.this.onTouchEvent(rv, e);
}
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
RecyclerViewDragDropManager.this.onRequestDisallowInterceptTouchEvent(disallowIntercept);
}
};
mInternalUseOnScrollListener = new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
RecyclerViewDragDropManager.this.onScrollStateChanged(recyclerView, newState);
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
RecyclerViewDragDropManager.this.onScrolled(recyclerView, dx, dy);
}
};
mScrollOnDraggingProcess = new ScrollOnDraggingProcessRunnable(this);
}
/**
* Create wrapped adapter.
*
* @param adapter The target adapter.
* @return Wrapped adapter which is associated to this {@link RecyclerViewDragDropManager} instance.
*/
@SuppressWarnings("unchecked")
public RecyclerView.Adapter createWrappedAdapter(RecyclerView.Adapter adapter) {
if (mAdapter != null) {
throw new IllegalStateException("already have a wrapped adapter");
}
mAdapter = new DraggableItemWrapperAdapter(this, adapter);
return mAdapter;
}
/**
* Indicates this manager instance has released or not.
*
* @return True if this manager instance has released
*/
public boolean isReleased() {
return (mInternalUseOnItemTouchListener == null);
}
/**
* Attaches {@link android.support.v7.widget.RecyclerView} instance.
*
* Before calling this method, the target {@link android.support.v7.widget.RecyclerView} must set
* the wrapped adapter instance which is returned by the
* {@link #createWrappedAdapter(android.support.v7.widget.RecyclerView.Adapter)} method.
*
* @param rv The {@link android.support.v7.widget.RecyclerView} instance
*/
public void attachRecyclerView(RecyclerView rv) {
//noinspection deprecation
attachRecyclerView(rv, null);
}
/**
* Attaches {@link android.support.v7.widget.RecyclerView} instance.
*
* Before calling this method, the target {@link android.support.v7.widget.RecyclerView} must set
* the wrapped adapter instance which is returned by the
* {@link #createWrappedAdapter(android.support.v7.widget.RecyclerView.Adapter)} method.
*
* @param rv The {@link android.support.v7.widget.RecyclerView} instance
* @param scrollEventDistributor The distributor for {@link android.support.v7.widget.RecyclerView.OnScrollListener} event
*/
@Deprecated
public void attachRecyclerView(RecyclerView rv, @SuppressWarnings("deprecation") RecyclerViewOnScrollEventDistributor scrollEventDistributor) {
if (rv == null) {
throw new IllegalArgumentException("RecyclerView cannot be null");
}
if (isReleased()) {
throw new IllegalStateException("Accessing released object");
}
if (mRecyclerView != null) {
throw new IllegalStateException("RecyclerView instance has already been set");
}
if (mAdapter == null || getDraggableItemWrapperAdapter(rv) != mAdapter) {
throw new IllegalStateException("adapter is not set properly");
}
if (scrollEventDistributor != null) {
final RecyclerView rv2 = scrollEventDistributor.getRecyclerView();
if (rv2 != null && rv2 != rv) {
throw new IllegalArgumentException("The scroll event distributor attached to different RecyclerView instance");
}
}
mRecyclerView = rv;
if (scrollEventDistributor != null) {
scrollEventDistributor.add(mInternalUseOnScrollListener);
mScrollEventRegisteredToDistributor = true;
} else {
mRecyclerView.addOnScrollListener(mInternalUseOnScrollListener);
mScrollEventRegisteredToDistributor = false;
}
mRecyclerView.addOnItemTouchListener(mInternalUseOnItemTouchListener);
mDisplayDensity = mRecyclerView.getResources().getDisplayMetrics().density;
mTouchSlop = ViewConfiguration.get(mRecyclerView.getContext()).getScaledTouchSlop();
mScrollTouchSlop = (int) (mTouchSlop * SCROLL_TOUCH_SLOP_MULTIPLY + 0.5f);
mHandler = new InternalHandler(this);
if (supportsEdgeEffect()) {
// edge effect is available on ICS or later
mEdgeEffectDecorator = new EdgeEffectDecorator(mRecyclerView);
mEdgeEffectDecorator.start();
}
}
/**
* Detach the {@link android.support.v7.widget.RecyclerView} instance and release internal field references.
*
* This method should be called in order to avoid memory leaks.
*/
public void release() {
cancelDrag();
if (mHandler != null) {
mHandler.release();
mHandler = null;
}
if (mEdgeEffectDecorator != null) {
mEdgeEffectDecorator.finish();
mEdgeEffectDecorator = null;
}
if (mRecyclerView != null && mInternalUseOnItemTouchListener != null) {
mRecyclerView.removeOnItemTouchListener(mInternalUseOnItemTouchListener);
}
mInternalUseOnItemTouchListener = null;
if (mRecyclerView != null && mInternalUseOnScrollListener != null && mScrollEventRegisteredToDistributor) {
mRecyclerView.removeOnScrollListener(mInternalUseOnScrollListener);
}
mInternalUseOnScrollListener = null;
if (mScrollOnDraggingProcess != null) {
mScrollOnDraggingProcess.release();
mScrollOnDraggingProcess = null;
}
mAdapter = null;
mRecyclerView = null;
mSwapTargetTranslationInterpolator = null;
mScrollEventRegisteredToDistributor = false;
}
/**
* Indicates whether currently performing item dragging.
*
* @return True if currently performing item dragging
*/
public boolean isDragging() {
return (mDraggingItemId != RecyclerView.NO_ID) && (mDeferredCancelProcess == null);
}
/**
* Sets 9-patch image which is used for the actively dragging item
*
* @param drawable The 9-patch drawable
*/
public void setDraggingItemShadowDrawable(NinePatchDrawable drawable) {
mShadowDrawable = drawable;
}
/**
* Sets the interpolator which is used for determining the position of the swapping item.
*
* @param interpolator Interpolator to set or null to clear
*/
public void setSwapTargetTranslationInterpolator(Interpolator interpolator) {
mSwapTargetTranslationInterpolator = interpolator;
}
/**
* Returns whether dragging starts on a long press or not.
*
* @return True if dragging starts on a long press, false otherwise.
*/
public boolean isInitiateOnLongPressEnabled() {
return mInitiateOnLongPress;
}
/**
* Sets whether dragging starts on a long press. (default: false)
*
* @param initiateOnLongPress True to initiate dragging on long press.
*/
public void setInitiateOnLongPress(boolean initiateOnLongPress) {
mInitiateOnLongPress = initiateOnLongPress;
}
/**
* Returns whether dragging starts on move motions.
*
* @return True if dragging starts on move motions, false otherwise.
*/
public boolean isInitiateOnMoveEnabled() {
return mInitiateOnMove;
}
/**
* Sets whether dragging starts on move motions. (default: true)
*
* @param initiateOnMove True to initiate dragging on move motions.
*/
public void setInitiateOnMove(boolean initiateOnMove) {
mInitiateOnMove = initiateOnMove;
}
/**
* Gets the interpolator which ise used for determining the position of the swapping item.
*
* @return Interpolator which is used for determining the position of the swapping item
*/
public Interpolator setSwapTargetTranslationInterpolator() {
return mSwapTargetTranslationInterpolator;
}
/**
* Gets OnItemDragEventListener listener
* @return The listener object
*/
public OnItemDragEventListener getOnItemDragEventListener() {
return mItemDragEventListener;
}
/**
* Sets OnItemDragEventListener listener
*
* @param listener The listener object
*/
public void setOnItemDragEventListener(OnItemDragEventListener listener) {
mItemDragEventListener = listener;
}
/*package*/ boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
final int action = MotionEventCompat.getActionMasked(e);
if (LOCAL_LOGV) {
Log.v(TAG, "onInterceptTouchEvent() action = " + action);
}
switch (action) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
handleActionUpOrCancel(rv, e);
break;
case MotionEvent.ACTION_DOWN:
if (!isDragging()) {
handleActionDown(rv, e);
}
break;
case MotionEvent.ACTION_MOVE:
if (isDragging()) {
// NOTE: The first ACTION_MOVE event will come here. (maybe a bug of RecyclerView?)
handleActionMoveWhileDragging(rv, e);
return true;
} else {
if (handleActionMoveWhileNotDragging(rv, e)) {
return true;
}
}
}
return false;
}
/*package*/ void onTouchEvent(RecyclerView rv, MotionEvent e) {
final int action = MotionEventCompat.getActionMasked(e);
if (LOCAL_LOGV) {
Log.v(TAG, "onTouchEvent() action = " + action);
}
if (!isDragging()) {
// Log.w(TAG, "onTouchEvent() - unexpected state");
return;
}
switch (action) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
handleActionUpOrCancel(rv, e);
break;
case MotionEvent.ACTION_MOVE:
handleActionMoveWhileDragging(rv, e);
break;
}
}
/*package */ void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
if (disallowIntercept) {
cancelDrag(true);
}
}
/*package*/ void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (LOCAL_LOGV) {
Log.v(TAG, "onScrolled(dx = " + dx + ", dy = " + dy + ")");
}
if (mInScrollByMethod) {
mActualScrollByAmount = dy;
}
}
/*package*/ void onScrollStateChanged(RecyclerView recyclerView, int newState) {
if (LOCAL_LOGV) {
Log.v(TAG, "onScrollStateChanged(newState = " + newState + ")");
}
}
private boolean handleActionDown(RecyclerView rv, MotionEvent e) {
final RecyclerView.ViewHolder holder = CustomRecyclerViewUtils.findChildViewHolderUnderWithoutTranslation(rv, e.getX(), e.getY());
if (!checkTouchedItemState(rv, holder)) {
return false;
}
mInitialTouchY = mLastTouchY = (int) (e.getY() + 0.5f);
mInitialTouchItemId = holder.getItemId();
if (mInitiateOnLongPress) {
mHandler.startLongPressDetection(e);
}
return true;
}
private void handleOnLongPress(MotionEvent e) {
if (mInitiateOnLongPress) {
checkConditionAndStartDragging(mRecyclerView, e, false);
}
}
@SuppressWarnings("unchecked")
private void startDragging(RecyclerView rv, MotionEvent e, RecyclerView.ViewHolder holder, ItemDraggableRange range) {
safeEndAnimation(rv, holder);
mHandler.cancelLongPressDetection();
mDraggingItem = holder;
// XXX if setIsRecyclable() is used, another view holder objects will be created
// which has the same ID with currently dragging item... Not works as expected.
// mDraggingItem.setIsRecyclable(false);
mDraggingItemId = mDraggingItem.getItemId();
mDraggableRange = range;
final View itemView = mDraggingItem.itemView;
mOrigOverScrollMode = ViewCompat.getOverScrollMode(rv);
ViewCompat.setOverScrollMode(rv, ViewCompat.OVER_SCROLL_NEVER);
mLastTouchY = (int) (e.getY() + 0.5f);
// disable auto scrolling until user moves the item
mDragStartTouchY = mDragMinTouchY = mDragMaxTouchY = mLastTouchY;
mScrollDirMask = SCROLL_DIR_NONE;
// calculate the view-local offset from the touched point
mGrabbedPositionY = mLastTouchY - itemView.getTop();
mGrabbedItemHeight = itemView.getHeight();
CustomRecyclerViewUtils.getLayoutMargins(itemView, mDraggingItemMargins);
mRecyclerView.getParent().requestDisallowInterceptTouchEvent(true);
startScrollOnDraggingProcess();
// raise onDragItemStarted() event
mAdapter.onDragItemStarted(mDraggingItem, mDraggableRange);
// setup decorators
mAdapter.onBindViewHolder(mDraggingItem, mDraggingItem.getLayoutPosition());
mDraggingItemDecorator = new DraggingItemDecorator(mRecyclerView, mDraggingItem, mDraggableRange);
mDraggingItemDecorator.setShadowDrawable(mShadowDrawable);
mDraggingItemDecorator.start(e, mGrabbedPositionY);
if (supportsViewTranslation()) {
mSwapTargetItemOperator = new SwapTargetItemOperator(mRecyclerView, mDraggingItem, mDraggableRange);
mSwapTargetItemOperator.setSwapTargetTranslationInterpolator(mSwapTargetTranslationInterpolator);
mSwapTargetItemOperator.start();
mSwapTargetItemOperator.update(mDraggingItemDecorator.getDraggingItemTranslationY());
}
if (mEdgeEffectDecorator != null) {
mEdgeEffectDecorator.reorderToTop();
}
if (mItemDragEventListener != null) {
mItemDragEventListener.onItemDragStarted(mAdapter.getDraggingItemInitialPosition());
}
}
/**
* Cancel dragging.
*/
public void cancelDrag() {
cancelDrag(false);
}
private void cancelDrag(boolean immediately) {
if (immediately) {
finishDragging(false);
} else {
if (isDragging()) {
if (mDeferredCancelProcess == null) {
mDeferredCancelProcess = new Runnable() {
@Override
public void run() {
if (mDeferredCancelProcess == this) {
mDeferredCancelProcess = null;
finishDragging(false);
}
}
};
mRecyclerView.post(mDeferredCancelProcess);
}
}
}
}
private void finishDragging(boolean result) {
final RecyclerView.ViewHolder draggedItem = mDraggingItem;
if (draggedItem == null) {
result = false;
}
// cancel deferred request
if (mDeferredCancelProcess != null) {
mRecyclerView.removeCallbacks(mDeferredCancelProcess);
mDeferredCancelProcess = null;
}
// NOTE: setOverScrollMode() have to be called before calling removeItemDecoration()
if (mRecyclerView != null && mDraggingItem != null) {
ViewCompat.setOverScrollMode(mRecyclerView, mOrigOverScrollMode);
}
if (mDraggingItemDecorator != null) {
mDraggingItemDecorator.setReturnToDefaultPositionAnimationDuration(mItemSettleBackIntoPlaceAnimationDuration);
mDraggingItemDecorator.setReturnToDefaultPositionAnimationInterpolator(mItemSettleBackIntoPlaceAnimationInterpolator);
mDraggingItemDecorator.finish(true);
}
if (mSwapTargetItemOperator != null) {
mSwapTargetItemOperator.setReturnToDefaultPositionAnimationDuration(mItemSettleBackIntoPlaceAnimationDuration);
mDraggingItemDecorator.setReturnToDefaultPositionAnimationInterpolator(mItemSettleBackIntoPlaceAnimationInterpolator);
mSwapTargetItemOperator.finish(true);
}
if (mEdgeEffectDecorator != null) {
mEdgeEffectDecorator.releaseBothGlows();
}
stopScrollOnDraggingProcess();
if (mRecyclerView != null && mRecyclerView.getParent() != null) {
mRecyclerView.getParent().requestDisallowInterceptTouchEvent(false);
}
if (mRecyclerView != null) {
mRecyclerView.invalidate();
}
mDraggableRange = null;
mDraggingItemDecorator = null;
mSwapTargetItemOperator = null;
mDraggingItem = null;
mDraggingItemId = RecyclerView.NO_ID;
mLastTouchY = 0;
mDragStartTouchY = 0;
mDragMinTouchY = 0;
mDragMaxTouchY = 0;
mGrabbedPositionY = 0;
mGrabbedItemHeight = 0;
int draggingItemInitialPosition = RecyclerView.NO_POSITION;
int draggingItemCurrentPosition = RecyclerView.NO_POSITION;
// raise onDragItemFinished() event
if (mAdapter != null) {
draggingItemInitialPosition = mAdapter.getDraggingItemInitialPosition();
draggingItemCurrentPosition = mAdapter.getDraggingItemCurrentPosition();
mAdapter.onDragItemFinished(draggedItem, result);
}
// if (draggedItem != null) {
// draggedItem.setIsRecyclable(true);
// }
if (mItemDragEventListener != null) {
mItemDragEventListener.onItemDragFinished(
draggingItemInitialPosition,
draggingItemCurrentPosition,
result);
}
}
private boolean handleActionUpOrCancel(RecyclerView rv, MotionEvent e) {
final boolean result = (MotionEventCompat.getActionMasked(e) == MotionEvent.ACTION_UP);
mHandler.cancelLongPressDetection();
mInitialTouchY = 0;
mLastTouchY = 0;
mDragStartTouchY = 0;
mDragMinTouchY = 0;
mDragMaxTouchY = 0;
mInitialTouchItemId = RecyclerView.NO_ID;
if (isDragging()) {
if (LOCAL_LOGD) {
Log.d(TAG, "dragging finished --- result = " + result);
}
finishDragging(result);
}
return true;
}
private boolean handleActionMoveWhileNotDragging(RecyclerView rv, MotionEvent e) {
if (mInitiateOnMove) {
return checkConditionAndStartDragging(rv, e, true);
} else {
return false;
}
}
private boolean checkConditionAndStartDragging(RecyclerView rv, MotionEvent e, boolean checkTouchSlop) {
if (mDraggingItem != null) {
return false;
}
final int touchX = (int) (e.getX() + 0.5f);
final int touchY = (int) (e.getY() + 0.5f);
mLastTouchY = touchY;
if (mInitialTouchItemId == RecyclerView.NO_ID) {
return false;
}
if (checkTouchSlop) {
if (!(Math.abs(touchY - mInitialTouchY) > mTouchSlop)) {
return false;
}
}
final RecyclerView.ViewHolder holder = CustomRecyclerViewUtils.findChildViewHolderUnderWithoutTranslation(rv, e.getX(), e.getY());
if (!checkTouchedItemState(rv, holder) || holder.getItemId() != mInitialTouchItemId) {
mInitialTouchItemId = RecyclerView.NO_ID;
mHandler.cancelLongPressDetection();
return false;
}
int position = CustomRecyclerViewUtils.getSynchronizedPosition(holder);
if (position == RecyclerView.NO_POSITION) {
return false;
}
final View view = holder.itemView;
final int translateX = (int) (ViewCompat.getTranslationX(view) + 0.5f);
final int translateY = (int) (ViewCompat.getTranslationY(view) + 0.5f);
final int viewX = touchX - (view.getLeft() + translateX);
final int viewY = touchY - (view.getTop() + translateY);
if (!mAdapter.canStartDrag(holder, position, viewX, viewY)) {
return false;
}
ItemDraggableRange range = mAdapter.getItemDraggableRange(holder, position);
if (range == null) {
range = new ItemDraggableRange(0, Math.max(0, mAdapter.getItemCount() - 1));
}
verifyItemDraggableRange(range, holder);
if (LOCAL_LOGD) {
Log.d(TAG, "dragging started");
}
startDragging(rv, e, holder, range);
return true;
}
private void verifyItemDraggableRange(ItemDraggableRange range, RecyclerView.ViewHolder holder) {
final int start = 0;
final int end = Math.max(0, mAdapter.getItemCount() - 1);
if (range.getStart() > range.getEnd()) {
throw new IllegalStateException("Invalid range specified --- start > range (range = " + range + ")");
}
if (range.getStart() < start) {
throw new IllegalStateException("Invalid range specified --- start < 0 (range = " + range + ")");
}
if (range.getEnd() > end) {
throw new IllegalStateException("Invalid range specified --- end >= count (range = " + range + ")");
}
if (!range.checkInRange(holder.getAdapterPosition())) {
throw new IllegalStateException(
"Invalid range specified --- does not contain drag target item"
+ " (range = " + range + ", position = " + holder.getAdapterPosition() + ")");
}
}
private void handleActionMoveWhileDragging(RecyclerView rv, MotionEvent e) {
mLastTouchY = (int) (e.getY() + 0.5f);
mDragMinTouchY = Math.min(mDragMinTouchY, mLastTouchY);
mDragMaxTouchY = Math.max(mDragMaxTouchY, mLastTouchY);
// update drag direction mask
updateDragDirectionMask();
// update decorators
mDraggingItemDecorator.update(e);
if (mSwapTargetItemOperator != null) {
mSwapTargetItemOperator.update(mDraggingItemDecorator.getDraggingItemTranslationY());
}
// check swapping
checkItemSwapping(rv);
}
private void updateDragDirectionMask() {
if (((mDragStartTouchY - mDragMinTouchY) > mScrollTouchSlop) ||
((mDragMaxTouchY - mLastTouchY) > mScrollTouchSlop)) {
mScrollDirMask |= SCROLL_DIR_UP;
}
if (((mDragMaxTouchY - mDragStartTouchY) > mScrollTouchSlop) ||
((mLastTouchY - mDragMinTouchY) > mScrollTouchSlop)) {
mScrollDirMask |= SCROLL_DIR_DOWN;
}
}
private void checkItemSwapping(RecyclerView rv) {
final RecyclerView.ViewHolder draggingItem = mDraggingItem;
final int overlayItemTop = mLastTouchY - mGrabbedPositionY;
final RecyclerView.ViewHolder swapTargetHolder =
findSwapTargetItem(rv, draggingItem, mDraggingItemId, overlayItemTop, mDraggableRange);
if ((swapTargetHolder != null) && (swapTargetHolder != mDraggingItem)) {
swapItems(rv, draggingItem, swapTargetHolder);
}
}
/*package*/ void handleScrollOnDragging() {
final RecyclerView rv = mRecyclerView;
final int height = rv.getHeight();
if (height == 0) {
return;
}
final float invHeight = (1.0f / height);
final float y = mLastTouchY * invHeight;
final float threshold = SCROLL_THRESHOLD;
final float invThreshold = (1.0f / threshold);
final float centerOffset = y - 0.5f;
final float absCenterOffset = Math.abs(centerOffset);
final float acceleration = Math.max(0.0f, threshold - (0.5f - absCenterOffset)) * invThreshold;
final int mask = mScrollDirMask;
int scrollAmount = (int) Math.signum(centerOffset) * (int) (SCROLL_AMOUNT_COEFF * mDisplayDensity * acceleration + 0.5f);
int actualScrolledAmount = 0;
final ItemDraggableRange range = mDraggableRange;
final int firstVisibleChild = CustomRecyclerViewUtils.findFirstCompletelyVisibleItemPosition(mRecyclerView);
final int lastVisibleChild = CustomRecyclerViewUtils.findLastCompletelyVisibleItemPosition(mRecyclerView);
boolean reachedToTopHardLimit = false;
boolean reachedToTopSoftLimit = false;
boolean reachedToBottomHardLimit = false;
boolean reachedToBottomSoftLimit = false;
if (firstVisibleChild != RecyclerView.NO_POSITION) {
if (firstVisibleChild <= range.getStart()) {
reachedToTopSoftLimit = true;
}
if (firstVisibleChild <= (range.getStart() - 1)) {
reachedToTopHardLimit = true;
}
}
if (lastVisibleChild != RecyclerView.NO_POSITION) {
if (lastVisibleChild >= range.getEnd()) {
reachedToBottomSoftLimit = true;
}
if (lastVisibleChild >= (range.getEnd() + 1)) {
reachedToBottomHardLimit = true;
}
}
// apply mask
if (scrollAmount > 0) {
if ((mask & SCROLL_DIR_DOWN) == 0) {
scrollAmount = 0;
}
} else if (scrollAmount < 0) {
if ((mask & SCROLL_DIR_UP) == 0) {
scrollAmount = 0;
}
}
// scroll
if ((!reachedToTopHardLimit && (scrollAmount < 0)) ||
(!reachedToBottomHardLimit && (scrollAmount > 0))) {
safeEndAnimations(rv);
actualScrolledAmount = scrollByYAndGetScrolledAmount(scrollAmount);
if (scrollAmount < 0) {
mDraggingItemDecorator.setIsScrolling(!reachedToTopSoftLimit);
} else {
mDraggingItemDecorator.setIsScrolling(!reachedToBottomSoftLimit);
}
mDraggingItemDecorator.refresh();
if (mSwapTargetItemOperator != null) {
mSwapTargetItemOperator.update(mDraggingItemDecorator.getDraggingItemTranslationY());
}
} else {
mDraggingItemDecorator.setIsScrolling(false);
}
final boolean actualIsScrolling = (actualScrolledAmount != 0);
if (mEdgeEffectDecorator != null) {
final float edgeEffectStrength = 0.005f;
final int draggingItemTop = mDraggingItemDecorator.getTranslatedItemPositionTop();
final int draggingItemBottom = mDraggingItemDecorator.getTranslatedItemPositionBottom();
final int draggingItemCenter = (draggingItemTop + draggingItemBottom) / 2;
final int nearEdgePosition;
if (firstVisibleChild == 0 && lastVisibleChild == 0) {
// has only 1 item
nearEdgePosition = (scrollAmount < 0) ? draggingItemTop : draggingItemBottom;
} else {
nearEdgePosition = (draggingItemCenter < (height / 2)) ? draggingItemTop : draggingItemBottom;
}
final float nearEdgeOffset = (nearEdgePosition * invHeight) - 0.5f;
final float absNearEdgeOffset = Math.abs(nearEdgeOffset);
float edgeEffectPullDistance = 0;
if ((absNearEdgeOffset > 0.4f) && (scrollAmount != 0) && !actualIsScrolling) {
if (nearEdgeOffset < 0) {
// upward
if (mDraggingItemDecorator.isReachedToTopLimit()) {
edgeEffectPullDistance = -mDisplayDensity * edgeEffectStrength;
}
} else {
// downward
if (mDraggingItemDecorator.isReachedToBottomLimit()) {
edgeEffectPullDistance = mDisplayDensity * edgeEffectStrength;
}
}
}
updateEdgeEffect(edgeEffectPullDistance);
}
ViewCompat.postOnAnimation(mRecyclerView, mCheckItemSwappingRunnable);
}
private void updateEdgeEffect(float distance) {
if (distance != 0.0f) {
if (distance < 0) {
// upward
mEdgeEffectDecorator.pullTopGlow(distance);
} else {
// downward
mEdgeEffectDecorator.pullBottom(distance);
}
} else {
mEdgeEffectDecorator.releaseBothGlows();
}
}