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MIT License
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package com.kevinzhu.xpense; //from w w w . j ava2 s . co m import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.animation.ValueAnimator; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.graphics.Rect; import android.util.Log; import android.view.MotionEvent; import android.view.VelocityTracker; import android.view.View; import android.view.ViewConfiguration; import android.view.ViewGroup; import android.view.ViewPropertyAnimator; import android.widget.AbsListView; import android.widget.ImageButton; import android.widget.ListView; import com.parse.GetCallback; import com.parse.ParseException; import com.parse.ParseObject; import com.parse.ParseQuery; import java.util.ArrayList; import java.util.List; /** * A {@link View.OnTouchListener} that makes the list items in a {@link ListView} * dismissable. {@link ListView} is given special treatment because by default it handles touches * for its list items... i.e. it's in charge of drawing the pressed state (the list selector), * handling list item clicks, etc. * * <p>After creating the listener, the caller should also call * {@link ListView#setOnScrollListener(AbsListView.OnScrollListener)}, passing * in the scroll listener returned by {@link #makeScrollListener()}. If a scroll listener is * already assigned, the caller should still pass scroll changes through to this listener. This will * ensure that this {@link SwipeDismissListViewTouchListener} is paused during list view * scrolling.</p> * * <p>Example usage:</p> * * <pre> * SwipeDismissListViewTouchListener touchListener = * new SwipeDismissListViewTouchListener( * listView, * new SwipeDismissListViewTouchListener.OnDismissCallback() { * public void onDismiss(ListView listView, int[] reverseSortedPositions) { * for (int position : reverseSortedPositions) { * adapter.remove(adapter.getItem(position)); * } * adapter.notifyDataSetChanged(); * } * }); * listView.setOnTouchListener(touchListener); * listView.setOnScrollListener(touchListener.makeScrollListener()); * </pre> * * <p>This class Requires API level 12 or later due to use of {@link * ViewPropertyAnimator}.</p> * */ public class SwipeDismissListViewTouchListener implements View.OnTouchListener { // Cached ViewConfiguration and system-wide constant values private int mSlop; private int mMinFlingVelocity; private int mMaxFlingVelocity; private long mAnimationTime; // Fixed properties private ListView mListView; private DismissCallbacks mCallbacks; private int mViewWidth = 1; // 1 and not 0 to prevent dividing by zero // Transient properties private List<PendingDismissData> mPendingDismisses = new ArrayList<PendingDismissData>(); private int mDismissAnimationRefCount = 0; private float mDownX; private float mDownY; private boolean mSwiping; private int mSwipingSlop; private VelocityTracker mVelocityTracker; //Gets the position of child in Listview, ranges from 0 to length(Listview) private int mDownPosition; private View mDownView; private ImageButton edit; private ImageButton delete; private boolean mPaused; private String mCurrentListType; private Context mCurrentContext; //The child in the listView that's currently been swiped to the right //Layout will be reset once a touch occurs again. private View focusedChild = null; /** * The callback interface used by {@link SwipeDismissListViewTouchListener} to inform its client * about a successful dismissal of one or more list item positions. */ public interface DismissCallbacks { /** * Called to determine whether the given position can be dismissed. */ boolean canDismiss(int position); /** * Called when the user has indicated they she would like to dismiss one or more list item * positions. * * @param listView The originating {@link ListView}. * @param reverseSortedPositions An array of positions to dismiss, sorted in descending * order for convenience. */ void onDismiss(ListView listView, int[] reverseSortedPositions); } /** * Constructs a new swipe-to-dismiss touch listener for the given list view. * * @param listView The list view whose items should be dismissable. * @param callbacks The callback to trigger when the user has indicated that she would like to * dismiss one or more list items. */ public SwipeDismissListViewTouchListener(ListView listView, DismissCallbacks callbacks, Context c, String currentListType) { ViewConfiguration vc = ViewConfiguration.get(listView.getContext()); mSlop = vc.getScaledTouchSlop(); mMinFlingVelocity = vc.getScaledMinimumFlingVelocity() * 16; mMaxFlingVelocity = vc.getScaledMaximumFlingVelocity(); mAnimationTime = listView.getContext().getResources().getInteger( android.R.integer.config_shortAnimTime); mListView = listView; mCallbacks = callbacks; mCurrentContext = c; mCurrentListType = currentListType; } /** * Enables or disables (pauses or resumes) watching for swipe-to-dismiss gestures. * * @param enabled Whether or not to watch for gestures. */ public void setEnabled(boolean enabled) { mPaused = !enabled; } /** * Returns an {@link AbsListView.OnScrollListener} to be added to the {@link * ListView} using {@link ListView#setOnScrollListener(AbsListView.OnScrollListener)}. * If a scroll listener is already assigned, the caller should still pass scroll changes through * to this listener. This will ensure that this {@link SwipeDismissListViewTouchListener} is * paused during list view scrolling.</p> * * @see SwipeDismissListViewTouchListener */ public AbsListView.OnScrollListener makeScrollListener() { return new AbsListView.OnScrollListener() { @Override public void onScrollStateChanged(AbsListView absListView, int scrollState) { setEnabled(scrollState != AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL); } @Override public void onScroll(AbsListView absListView, int i, int i1, int i2) { } }; } @Override public boolean onTouch(View view, MotionEvent motionEvent) { if (mViewWidth < 2) { mViewWidth = mListView.getWidth(); } switch (motionEvent.getActionMasked()) { case MotionEvent.ACTION_DOWN: { if (mPaused) { return false; } if (focusedChild != null) { ImageButton focusedEdit = (ImageButton)focusedChild.findViewById(R.id.edit); ImageButton focusedDelete = (ImageButton)focusedChild.findViewById(R.id.delete); pushAwayIcons(focusedEdit, focusedDelete); // This needs to be done or else the translation will execute continously on // retouch of focusedChild, showing considerable lag focusedChild = null; } // Find the child view that was touched (perform a hit test) Rect rect = new Rect(); int childCount = mListView.getChildCount(); int[] listViewCoords = new int[2]; mListView.getLocationOnScreen(listViewCoords); int x = (int) motionEvent.getRawX() - listViewCoords[0]; int y = (int) motionEvent.getRawY() - listViewCoords[1]; View child; //Uses hitboxes to detect which child is tapped. We assign focus to that child //in the form of mDownView = child and will do operations to that. for (int i = 0; i < childCount; i++) { child = mListView.getChildAt(i); edit = (ImageButton) child.findViewById(R.id.edit); delete = (ImageButton) child.findViewById(R.id.delete); //The child's hitbox. Will be the edges surrounding the child in the list child.getHitRect(rect); if (rect.contains(x, y)) { mDownView = child; break; } } if (mDownView != null) { //Get the starting position. To be compared with the raw X and Y values during //ACTION_UP mDownX = motionEvent.getRawX(); mDownY = motionEvent.getRawY(); //Position entails the location in the list mDownPosition = mListView.getPositionForView(mDownView); if (mCallbacks.canDismiss(mDownPosition)) { //New VT object to watch the velocity of a motion mVelocityTracker = VelocityTracker.obtain(); //Add user movement to the tracker mVelocityTracker.addMovement(motionEvent); } else { //Can't be dismissed, ignore. mDownView = null; } } return false; } case MotionEvent.ACTION_UP: { if (mVelocityTracker == null) { break; } float deltaX = motionEvent.getRawX() - mDownX; mVelocityTracker.addMovement(motionEvent); mVelocityTracker.computeCurrentVelocity(1000); float velocityX = mVelocityTracker.getXVelocity(); float absVelocityX = Math.abs(velocityX); float absVelocityY = Math.abs(mVelocityTracker.getYVelocity()); boolean dismiss = false; final View downView = mDownView; final int downPosition = mDownPosition; if (Math.abs(deltaX) > mViewWidth / 2 && mSwiping) { dismiss = true; } else if (mMinFlingVelocity <= absVelocityX && absVelocityX <= mMaxFlingVelocity && absVelocityY < absVelocityX && mSwiping) { // dismiss only if flinging in the same direction as dragging dismiss = true; } if (dismiss && mDownPosition != ListView.INVALID_POSITION) { // dismiss int translatedDistance = (int)Math.round( 0.48 * mViewWidth ); focusedChild = downView; edit.setTranslationX(translatedDistance); delete.setTranslationX(translatedDistance); edit.setVisibility(View.VISIBLE); delete.setVisibility(View.VISIBLE); edit.animate().alpha(1) .translationX(0) .setDuration(mAnimationTime) .setListener(new AnimatorListenerAdapter(){ @Override public void onAnimationEnd(Animator animation) { } }); delete.animate().alpha(1) .translationX(0) .setDuration(mAnimationTime) .setListener(new AnimatorListenerAdapter(){ @Override public void onAnimationEnd(Animator animation) { } }); } mVelocityTracker.recycle(); mVelocityTracker = null; mDownX = 0; mDownY = 0; mDownView = null; mSwiping = false; edit.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent editEntry = new Intent(mCurrentContext, NewEntry.class); editEntry.putExtra("noteType", "editExisting"); editEntry.putExtra("objectIndex", mDownPosition); editEntry.putExtra("currentListType", mCurrentListType); mCurrentContext.startActivity(editEntry); } }); delete.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { new AlertDialog.Builder(mCurrentContext) .setTitle("Delete Entry") .setMessage("Are you sure you want to delete this entry?") .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { String focusedChildID = CashList.expenseArrayList.get(mDownPosition).getM_objectID(); String type = CashList.expenseArrayList.get(mDownPosition).getM_type(); Log.d("ObjectID", focusedChildID); ParseQuery<ParseObject> deleteQuery = ParseQuery.getQuery(type); deleteQuery.getInBackground(focusedChildID, new GetCallback<ParseObject>() { @Override public void done(ParseObject po_toBeDeleted, ParseException e) { if (e == null){ po_toBeDeleted.deleteInBackground(); performDismiss(downView, downPosition); } } }); } }) .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // do nothing } }) .setIcon(android.R.drawable.ic_dialog_alert) .show(); } }); break; } //Nts: This is repeatedly executed on ACTION_MOVE case MotionEvent.ACTION_MOVE: { if (mVelocityTracker == null || mPaused) { break; } mVelocityTracker.addMovement(motionEvent); float deltaX = motionEvent.getRawX() - mDownX; float deltaY = motionEvent.getRawY() - mDownY; if (Math.abs(deltaX) > mSlop && Math.abs(deltaY) < Math.abs(deltaX) / 2) { mSwiping = true; mSwipingSlop = (deltaX > 0 ? mSlop : -mSlop); mListView.requestDisallowInterceptTouchEvent(true); // Cancel ListView's touch (un-highlighting the item) MotionEvent cancelEvent = MotionEvent.obtain(motionEvent); cancelEvent.setAction(MotionEvent.ACTION_CANCEL | (motionEvent.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT)); mListView.onTouchEvent(cancelEvent); cancelEvent.recycle(); } if (mSwiping) { return true; } break; } } return false; } class PendingDismissData implements Comparable<PendingDismissData> { public int position; public View view; public PendingDismissData(int position, View view) { this.position = position; this.view = view; } @Override public int compareTo(PendingDismissData other) { // Sort by descending position return other.position - position; } } private void pushAwayIcons (final ImageButton edit, final ImageButton delete){ int translatedDistance = (int)Math.round( 0.48 * mViewWidth ); edit.animate().alpha(0) .translationX(translatedDistance) .setDuration(mAnimationTime) .setListener(new AnimatorListenerAdapter(){ @Override public void onAnimationEnd(Animator animation) { edit.setVisibility(View.INVISIBLE); edit.setTranslationX(0); } }); delete.animate().alpha(0) .translationX(translatedDistance) .setDuration(mAnimationTime) .setListener(new AnimatorListenerAdapter(){ @Override public void onAnimationEnd(Animator animation) { delete.setVisibility(View.INVISIBLE); delete.setTranslationX(0); } }); } private void performDismiss(final View dismissView, final int dismissPosition) { // Animate the dismissed list item to zero-height and fire the dismiss callback when // all dismissed list item animations have completed. This triggers layout on each animation // frame; in the future we may want to do something smarter and more performant. final ViewGroup.LayoutParams lp = dismissView.getLayoutParams(); final int originalHeight = dismissView.getHeight(); ValueAnimator animator = ValueAnimator.ofInt(originalHeight, 1).setDuration(mAnimationTime); animator.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mDownPosition = ListView.INVALID_POSITION; } }); animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { lp.height = (Integer) valueAnimator.getAnimatedValue(); dismissView.setLayoutParams(lp); } }); mPendingDismisses.add(new PendingDismissData(dismissPosition, dismissView)); animator.start(); } }