use of android.support.v7.widget.helper.ItemTouchHelper.ACTION_STATE_DRAG in project Reader by TheKeeperOfPie.
the class CustomItemTouchHelper method moveIfNecessary.
/**
* Checks if we should swap w/ another view holder.
*/
private void moveIfNecessary(RecyclerView.ViewHolder viewHolder) {
if (mRecyclerView.isLayoutRequested()) {
return;
}
if (mActionState != ACTION_STATE_DRAG) {
return;
}
final float threshold = mCallback.getMoveThreshold(viewHolder);
final int x = (int) (mSelectedStartX + mDx);
final int y = (int) (mSelectedStartY + mDy);
if (Math.abs(y - viewHolder.itemView.getTop()) < viewHolder.itemView.getHeight() * threshold && Math.abs(x - viewHolder.itemView.getLeft()) < viewHolder.itemView.getWidth() * threshold) {
return;
}
List<RecyclerView.ViewHolder> swapTargets = findSwapTargets(viewHolder);
if (swapTargets.size() == 0) {
return;
}
// may swap.
RecyclerView.ViewHolder target = mCallback.chooseDropTarget(viewHolder, swapTargets, x, y);
if (target == null) {
mSwapTargets.clear();
mDistances.clear();
return;
}
final int toPosition = target.getAdapterPosition();
final int fromPosition = viewHolder.getAdapterPosition();
if (mCallback.onMove(mRecyclerView, viewHolder, target)) {
// keep target visible
mCallback.onMoved(mRecyclerView, viewHolder, fromPosition, target, toPosition, x, y);
}
}
use of android.support.v7.widget.helper.ItemTouchHelper.ACTION_STATE_DRAG in project Reader by TheKeeperOfPie.
the class CustomItemTouchHelper method select.
/**
* Starts dragging or swiping the given View. Call with null if you want to clear it.
*
* @param selected The ViewHolder to drag or swipe. Can be null if you want to cancel the
* current action
* @param actionState The type of action
*/
public void select(RecyclerView.ViewHolder selected, int actionState) {
if (selected == mSelected && actionState == mActionState) {
return;
}
mDragScrollStartTimeInMs = Long.MIN_VALUE;
final int prevActionState = mActionState;
// prevent duplicate animations
endRecoverAnimation(selected, true);
mActionState = actionState;
if (actionState == ACTION_STATE_DRAG) {
// we remove after animation is complete. this means we only elevate the last drag
// child but that should perform good enough as it is very hard to start dragging a
// new child before the previous one settles.
mOverdrawChild = selected.itemView;
addChildDrawingOrderCallback();
}
int actionStateMask = (1 << (DIRECTION_FLAG_COUNT + DIRECTION_FLAG_COUNT * actionState)) - 1;
boolean preventLayout = false;
if (mSelected != null) {
final RecyclerView.ViewHolder prevSelected = mSelected;
if (prevSelected.itemView.getParent() != null) {
final int swipeDir = prevActionState == ACTION_STATE_DRAG ? 0 : swipeIfNecessary(prevSelected);
releaseVelocityTracker();
// find where we should animate to
final float targetTranslateX, targetTranslateY;
int animationType;
switch(swipeDir) {
case LEFT:
case RIGHT:
case START:
case END:
targetTranslateY = 0;
targetTranslateX = Math.signum(mDx) * mRecyclerView.getWidth();
break;
case UP:
case DOWN:
targetTranslateX = 0;
targetTranslateY = Math.signum(mDy) * mRecyclerView.getHeight();
break;
default:
targetTranslateX = 0;
targetTranslateY = 0;
}
if (prevActionState == ACTION_STATE_DRAG) {
animationType = ANIMATION_TYPE_DRAG;
} else if (swipeDir > 0) {
animationType = ANIMATION_TYPE_SWIPE_SUCCESS;
} else {
animationType = ANIMATION_TYPE_SWIPE_CANCEL;
}
getSelectedDxDy(mTmpPosition);
final float currentTranslateX = mTmpPosition[0];
final float currentTranslateY = mTmpPosition[1];
final RecoverAnimation rv = new RecoverAnimation(prevSelected, animationType, prevActionState, currentTranslateX, currentTranslateY, targetTranslateX, targetTranslateY) {
@Override
public void onAnimationEnd(ValueAnimatorCompat animation) {
super.onAnimationEnd(animation);
if (this.mOverridden) {
return;
}
if (swipeDir <= 0) {
// this is a drag or failed swipe. recover immediately
mCallback.clearView(mRecyclerView, prevSelected);
// full cleanup will happen on onDrawOver
} else {
// wait until remove animation is complete.
mPendingCleanup.add(prevSelected.itemView);
mIsPendingCleanup = true;
if (swipeDir > 0) {
// Animation might be ended by other animators during a layout.
// We defer callback to avoid editing adapter during a layout.
postDispatchSwipe(this, swipeDir);
}
}
// removed from the list after it is drawn for the last time
if (mOverdrawChild == prevSelected.itemView) {
removeChildDrawingOrderCallbackIfNecessary(prevSelected.itemView);
}
}
};
final long duration = mCallback.getAnimationDuration(mRecyclerView, animationType, targetTranslateX - currentTranslateX, targetTranslateY - currentTranslateY);
rv.setDuration(duration);
mRecoverAnimations.add(rv);
rv.start();
preventLayout = true;
} else {
removeChildDrawingOrderCallbackIfNecessary(prevSelected.itemView);
mCallback.clearView(mRecyclerView, prevSelected);
}
mSelected = null;
}
if (selected != null) {
mSelectedFlags = (mCallback.getAbsoluteMovementFlags(mRecyclerView, selected) & actionStateMask) >> (mActionState * DIRECTION_FLAG_COUNT);
mSelectedStartX = selected.itemView.getLeft();
mSelectedStartY = selected.itemView.getTop();
mSelected = selected;
if (actionState == ACTION_STATE_DRAG) {
mSelected.itemView.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
}
}
final ViewParent rvParent = mRecyclerView.getParent();
if (rvParent != null) {
// rvParent.requestDisallowInterceptTouchEvent(mSelected != null);
}
if (!preventLayout) {
mRecyclerView.getLayoutManager().requestSimpleAnimationsInNextLayout();
}
mCallback.onSelectedChanged(mSelected, mActionState);
mRecyclerView.invalidate();
}
use of android.support.v7.widget.helper.ItemTouchHelper.ACTION_STATE_DRAG in project Reader by TheKeeperOfPie.
the class CustomItemTouchHelper method checkSelectForSwipe.
/**
* Checks whether we should select a View for swiping.
*/
private boolean checkSelectForSwipe(int action, MotionEvent motionEvent, int pointerIndex) {
if (mSelected != null || action != MotionEvent.ACTION_MOVE || mActionState == ACTION_STATE_DRAG || !mCallback.isItemViewSwipeEnabled()) {
return false;
}
if (mRecyclerView.getScrollState() == RecyclerView.SCROLL_STATE_DRAGGING) {
return false;
}
final RecyclerView.ViewHolder vh = findSwipedView(motionEvent);
if (vh == null) {
return false;
}
final int movementFlags = mCallback.getAbsoluteMovementFlags(mRecyclerView, vh);
final int swipeFlags = (movementFlags & ACTION_MODE_SWIPE_MASK) >> (DIRECTION_FLAG_COUNT * ACTION_STATE_SWIPE);
if (swipeFlags == 0) {
return false;
}
// mDx and mDy are only set in allowed directions. We use custom x/y here instead of
// updateDxDy to avoid swiping if user moves more in the other direction
final float x = MotionEventCompat.getX(motionEvent, pointerIndex);
final float y = MotionEventCompat.getY(motionEvent, pointerIndex);
// Calculate the distance moved
final float dx = x - mInitialTouchX;
final float dy = y - mInitialTouchY;
// swipe target is chose w/o applying flags so it does not really check if swiping in that
// direction is allowed. This why here, we use mDx mDy to check slope value again.
final float absDx = Math.abs(dx);
final float absDy = Math.abs(dy);
if (absDx < mSlop && absDy < mSlop) {
return false;
}
if (absDx > absDy) {
if (dx < 0 && (swipeFlags & LEFT) == 0) {
return false;
}
if (dx > 0 && (swipeFlags & RIGHT) == 0) {
return false;
}
} else {
if (dy < 0 && (swipeFlags & UP) == 0) {
return false;
}
if (dy > 0 && (swipeFlags & DOWN) == 0) {
return false;
}
}
mDx = mDy = 0f;
mActivePointerId = MotionEventCompat.getPointerId(motionEvent, 0);
select(vh, ACTION_STATE_SWIPE);
return true;
}
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