package net.osmand.plus.views.controls;
/*
* Copyright 2013 Google Inc.
*
* 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.
*/
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Rect;
import android.os.Build;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.NonNull;
import android.support.v4.view.ViewCompat;
import android.support.v4.view.ViewPropertyAnimatorListener;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.view.ViewPropertyAnimator;
import android.widget.AbsListView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;
import net.osmand.plus.R;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.SortedSet;
import java.util.TreeSet;
/**
* 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/>
* <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/>
* <p>Example usage:</p>
* <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/>
* <p>This class Requires API level 12 or later due to use of {@link
* ViewPropertyAnimator}.</p>
* <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 VelocityTracker mVelocityTracker;
private int mDownPosition;
private View mSwipeDownView;
private boolean mSwipePaused;
private boolean mSwipeCanceled;
private PopupWindow mUndoPopup;
private int mValidDelayedMsgId;
private Handler mHideUndoHandler = new HideUndoPopupHandler();
private Button mUndoButton;
private UndoStyle mUndoStyle = UndoStyle.SINGLE_POPUP;
private boolean mTouchBeforeAutoHide = false;
private SwipeDirection mSwipeDirection = SwipeDirection.BOTH;
private int mUndoHideDelay = 5000;
private int mSwipingLayout;
private final Object[] mAnimationLock = new Object[0];
private List<Undoable> mUndoActions = new ArrayList<>();
private SortedSet<PendingDismissData> mPendingDismisses = new TreeSet<>();
private List<View> mAnimatedViews = new LinkedList<>();
private View mSwipeDownChild;
private TextView mUndoPopupTextView;
private float mScreenDensity;
/**
* Defines the direction in which list items can be swiped out to delete them.
* Use {@code #setSwipeDirection(SwipeDirection)}
* to change the default behavior.
*/
public enum SwipeDirection {
/**
* The user can swipe each item into both directions (left and right) to delete it.
*/
BOTH,
/**
* The user can only swipe the items to the beginning of the item to
* delete it. The start of an item is in Left-To-Right languages the left
* side and in Right-To-Left languages the right side. Before API level
* 17 this is always the left side.
*/
START,
/**
* The user can only swipe the items to the end of the item to delete it.
* This is in Left-To-Right languages the right side in Right-To-Left
* languages the left side. Before API level 17 this will always be the
* right side.
*/
END
}
/**
* Extend this abstract class and return it from
* {@code OnDismissCallback#onDismiss(EnhancedListView, int)}
* to let the user undo the deletion you've done with your {@code OnDismissCallback}.
* You have at least to implement the {@link #undo()} method, and can override {@link #discard()}
* and {@link #getTitle()} to offer more functionality. See the README file for example implementations.
*/
public abstract static class Undoable {
/**
* This method must undo the deletion you've done in
* OnDismissCallback.onDismiss(ListView, int) and reinsert
* the element into the adapter.
* <p/>
* In the most implementations, you will only remove the list item from your adapter
* in the {@code onDismiss} method and delete it from the database (or your permanent
* storage) in {@link #discard()}. In that case you only need to reinsert the item
* to the adapter.
*/
public abstract void undo();
/**
* Returns the individual undo message for this undo. This will be displayed in the undo
* window, beside the undo button. The default implementation returns {@code null},
* what will lead in a default message to be displayed in the undo window.
* Don't call the super method, when overriding this method.
*
* @return The title for a special string.
*/
public String getTitle() {
return null;
}
/**
* Discard the undo, meaning the user has no longer the possibility to undo the deletion.
* Implement this, to finally delete your stuff from permanent storages like databases
* (whereas in onKeyDown(int, android.view.KeyEvent) you should only remove it from the
* list adapter).
*/
public void discard() {
}
}
/**
* Defines the style in which <i>undos</i> should be displayed and handled in the list.
*/
public enum UndoStyle {
/**
* Shows a popup window, that allows the user to undo the last
* dismiss. If another element is deleted, the undo popup will undo that deletion.
* The user is only able to undo the last deletion.
*/
SINGLE_POPUP,
/**
* Shows a popup window, that allows the user to undo the last dismiss.
* If another item is deleted, this will be added to the chain of undos. So pressing
* undo will undo the last deletion, pressing it again will undo the deletion before that,
* and so on. As soon as the popup vanished (e.g. because {@link #setUndoHideDelay(int) autoHideDelay}
* is over) all saved undos will be discarded.
*/
MULTILEVEL_POPUP,
/**
* Shows a popup window, that allows the user to undo the last dismisses.
* If another item is deleted, while there is still an undo popup visible, the label
* of the button changes to <i>Undo all</i> and a press on the button, will discard
* all stored undos. As soon as the popup vanished (e.g. because {@link #setUndoHideDelay(int) autoHideDelay}
* is over) all saved undos will be discarded.
*/
COLLAPSED_POPUP
}
private class PendingDismissData implements Comparable<PendingDismissData> {
public int position;
/**
* The view that should get swiped out.
*/
public View view;
/**
* The whole list item view.
*/
public View childView;
PendingDismissData(int position, View view, View childView) {
this.position = position;
this.view = view;
this.childView = childView;
}
@Override
public int compareTo(@NonNull PendingDismissData other) {
// Sort by descending position
return other.position - position;
}
}
private class UndoClickListener implements View.OnClickListener {
/**
* Called when a view has been clicked.
*
* @param v The view that was clicked.
*/
@Override
public void onClick(View v) {
if (!mUndoActions.isEmpty()) {
switch (mUndoStyle) {
case SINGLE_POPUP:
mUndoActions.get(0).undo();
mUndoActions.clear();
break;
case COLLAPSED_POPUP:
Collections.reverse(mUndoActions);
for (Undoable undo : mUndoActions) {
undo.undo();
}
mUndoActions.clear();
break;
case MULTILEVEL_POPUP:
mUndoActions.get(mUndoActions.size() - 1).undo();
mUndoActions.remove(mUndoActions.size() - 1);
break;
}
}
// Dismiss dialog or change text
if (mUndoActions.isEmpty()) {
if (mUndoPopup.isShowing()) {
mUndoPopup.dismiss();
}
} else {
changePopupText();
changeButtonLabel();
}
mValidDelayedMsgId++;
}
}
private class HideUndoPopupHandler extends Handler {
/**
* Subclasses must implement this to receive messages.
*/
@Override
public void handleMessage(Message msg) {
if (msg.what == mValidDelayedMsgId) {
discardUndo();
}
}
}
/**
* 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 position Position to dismiss
*/
Undoable onDismiss(int position);
/**
* Called when popup is going to be hidden after time expired (not when UNDO clicked)
*/
void onHidePopup();
}
/**
* 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(Context ctx, ListView listView, DismissCallbacks callbacks) {
ViewConfiguration vc = ViewConfiguration.get(ctx);
mSlop = vc.getScaledTouchSlop();
mMinFlingVelocity = vc.getScaledMinimumFlingVelocity() * 16;
mMaxFlingVelocity = vc.getScaledMaximumFlingVelocity();
mAnimationTime = ctx.getResources().getInteger(
android.R.integer.config_shortAnimTime);
mListView = listView;
mCallbacks = callbacks;
// Initialize undo popup
LayoutInflater inflater = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View undoView = inflater.inflate(R.layout.undo_popup, null);
mUndoButton = (Button) undoView.findViewById(R.id.undo);
mUndoButton.setOnClickListener(new UndoClickListener());
mUndoButton.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// If the user touches the screen invalidate the current running delay by incrementing
// the valid message id. So this delay won't hide the undo popup anymore
mValidDelayedMsgId++;
return false;
}
});
mUndoPopupTextView = (TextView) undoView.findViewById(R.id.text);
mUndoPopup = new PopupWindow(undoView, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, false);
mUndoPopup.setAnimationStyle(R.style.Animations_PopUpMenu_Fade);
mScreenDensity = listView.getResources().getDisplayMetrics().density;
// END initialize undo popup
mListView.setOnTouchListener(this);
// Setting this scroll listener is required to ensure that during ListView scrolling,
// we don't look for swipes.
mListView.setOnScrollListener(makeScrollListener());
}
/**
* 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) {
mSwipePaused = !enabled;
}
/**
* Sets the undo style of this list.
*
* @param undoStyle The style of this listview.
*/
public void setUndoStyle(UndoStyle undoStyle) {
mUndoStyle = undoStyle;
}
/**
* Sets the time in milliseconds after which the undo popup automatically disappears.
* The countdown will start when the user touches the screen. If you want to start the countdown
* immediately when the popups appears, call {@link #setRequireTouchBeforeDismiss(boolean)} with
* {@code false}.
*
* @param hideDelay The delay in milliseconds.
*/
public void setUndoHideDelay(int hideDelay) {
mUndoHideDelay = hideDelay;
}
/**
* Sets whether another touch on the view is required before the popup counts down to dismiss
* the undo popup. By default this is set to {@code true}.
*
* @param touchBeforeDismiss Whether the screen needs to be touched before the countdown starts.
* @see #setUndoHideDelay(int)
*/
public void setRequireTouchBeforeDismiss(boolean touchBeforeDismiss) {
mTouchBeforeAutoHide = touchBeforeDismiss;
}
/**
* Sets the directions in which a list item can be swiped to delete.
* By default this is set to {@link SwipeDirection#BOTH} so that an item
* can be swiped into both directions.
*/
public void setSwipeDirection(SwipeDirection direction) {
mSwipeDirection = direction;
}
/**
* Sets the id of the view, that should be moved, when the user swipes an item.
* Only the view with the specified id will move, while all other views in the list item, will
* stay where they are. This might be usefull to have a background behind the view that is swiped
* out, to stay where it is (and maybe explain that the item is going to be deleted).
* If you never call this method (or call it with 0), the whole view will be swiped. Also if there
* is no view in a list item, with the given id, the whole view will be swiped.
*/
public void setSwipingLayout(int swipingLayoutId) {
mSwipingLayout = swipingLayoutId;
}
/**
* Discard all stored undos and hide the undo popup dialog.
* This method must be called in {@link android.app.Activity#onStop()}. Otherwise
* might not be called for several items, what might
* break your data consistency.
*/
public void discardUndo() {
for (Undoable undoable : mUndoActions) {
undoable.discard();
}
mUndoActions.clear();
if (mUndoPopup.isShowing()) {
if (mCallbacks != null) {
mCallbacks.onHidePopup();
}
mUndoPopup.dismiss();
}
}
/**
* Delete the list item at the specified position. This will animate the item sliding out of the
* list and then collapsing until it vanished (same as if the user slides out an item).
* <p/>
*/
public void delete(int position) {
if (mCallbacks == null) {
throw new IllegalStateException("You must set an OnDismissCallback, before deleting items.");
}
int pos = position + mListView.getHeaderViewsCount();
if (pos < 0 || pos >= mListView.getCount()) {
throw new IndexOutOfBoundsException(String.format("Tried to delete item %d. #items in list: %d", pos, mListView.getCount()));
}
View childView = mListView.getChildAt(pos - mListView.getFirstVisiblePosition());
View view = null;
if (mSwipingLayout > 0) {
view = childView.findViewById(mSwipingLayout);
}
if (view == null) {
view = childView;
}
slideOutView(view, childView, position, true);
}
/**
* Slide out a view to the right or left of the list. After the animation has finished, the
* view will be dismissed by calling {@link #performDismiss(android.view.View, android.view.View, int)}.
*
* @param view The view, that should be slided out.
* @param childView The whole view of the list item.
* @param position The item position of the item.
* @param toRightSide Whether it should slide out to the right side.
*/
private void slideOutView(final View view, final View childView, final int position, boolean toRightSide) {
// Only start new animation, if this view isn't already animated (too fast swiping bug)
synchronized (mAnimationLock) {
if (mAnimatedViews.contains(view)) {
return;
}
++mDismissAnimationRefCount;
mAnimatedViews.add(view);
}
ViewCompat.animate(view)
.translationX(toRightSide ? mViewWidth : -mViewWidth)
.alpha(0)
.setDuration(mAnimationTime)
.setListener(new ViewPropertyAnimatorListener() {
@Override
public void onAnimationStart(View view) {
}
@Override
public void onAnimationEnd(View view) {
performDismiss(view, childView, position);
}
@Override
public void onAnimationCancel(View view) {
}
});
}
/**
* 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 ev) {
if (mViewWidth < 2) {
mViewWidth = mListView.getWidth();
}
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN: {
if (mSwipePaused) {
return false;
}
// 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) ev.getRawX() - listViewCoords[0];
int y = (int) ev.getRawY() - listViewCoords[1];
View child;
for (int i = mListView.getHeaderViewsCount(); i < childCount; i++) {
child = mListView.getChildAt(i);
if (child != null) {
child.getHitRect(rect);
if (rect.contains(x, y)) {
// if a specific swiping layout has been giving, use this to swipe.
if (mSwipingLayout > 0) {
View swipingView = child.findViewById(mSwipingLayout);
if (swipingView != null) {
mSwipeDownView = swipingView;
mSwipeDownChild = child;
break;
}
}
// If no swiping layout has been found, swipe the whole child
mSwipeDownView = mSwipeDownChild = child;
break;
}
}
}
if (mSwipeDownView != null) {
// test if the item should be swiped
int position = mListView.getPositionForView(mSwipeDownView) - mListView.getHeaderViewsCount();
if (mCallbacks == null || mCallbacks.canDismiss(position)) {
mDownX = ev.getRawX();
mDownY = ev.getRawY();
mDownPosition = position;
mVelocityTracker = VelocityTracker.obtain();
mVelocityTracker.addMovement(ev);
} else {
// set back to null to revert swiping
mSwipeDownView = mSwipeDownChild = null;
}
}
return false;
}
case MotionEvent.ACTION_CANCEL: {
if (mVelocityTracker == null) {
break;
}
if (mSwipeDownView != null && mSwiping) {
// cancel
ViewCompat.animate(mSwipeDownView)
.translationX(0)
.alpha(1)
.setDuration(mAnimationTime)
.setListener(null);
}
mVelocityTracker.recycle();
mVelocityTracker = null;
mDownX = 0;
mDownY = 0;
mSwipeDownView = mSwipeDownChild = null;
mDownPosition = ListView.INVALID_POSITION;
mSwiping = false;
mSwipeCanceled = false;
break;
}
case MotionEvent.ACTION_UP: {
if (mVelocityTracker == null) {
break;
}
float deltaX = ev.getRawX() - mDownX;
mVelocityTracker.addMovement(ev);
mVelocityTracker.computeCurrentVelocity(1000);
float velocityX = Math.abs(mVelocityTracker.getXVelocity());
float velocityY = Math.abs(mVelocityTracker.getYVelocity());
boolean dismiss = false;
boolean dismissRight = false;
if (Math.abs(deltaX) > mViewWidth / 2 && mSwiping) {
dismiss = true;
dismissRight = deltaX > 0;
} else if (mMinFlingVelocity <= velocityX && velocityX <= mMaxFlingVelocity
&& velocityY < velocityX && mSwiping && isSwipeDirectionValid(mVelocityTracker.getXVelocity())
&& deltaX >= mViewWidth * 0.2f) {
dismiss = true;
dismissRight = mVelocityTracker.getXVelocity() > 0;
}
if (dismiss) {
// dismiss
slideOutView(mSwipeDownView, mSwipeDownChild, mDownPosition, dismissRight);
} else if (mSwiping) {
// Swipe back to regular position
ViewCompat.animate(mSwipeDownView)
.translationX(0)
.alpha(1)
.setDuration(mAnimationTime)
.setListener(null);
}
mVelocityTracker = null;
mDownX = 0;
mDownY = 0;
mSwipeDownView = null;
mSwipeDownChild = null;
mDownPosition = AbsListView.INVALID_POSITION;
mSwiping = false;
mSwipeCanceled = false;
break;
}
case MotionEvent.ACTION_MOVE: {
if (mVelocityTracker == null || mSwipePaused || mSwipeCanceled) {
break;
}
mVelocityTracker.addMovement(ev);
float deltaX = ev.getRawX() - mDownX;
float deltaY = ev.getRawY() - mDownY;
if (!mSwiping && Math.abs(deltaY) > mSlop * 2) {
mSwipeCanceled = true;
break;
}
// Only start swipe in correct direction
if (isSwipeDirectionValid(deltaX)) {
ViewParent parent = mListView.getParent();
if (parent != null) {
// If we swipe don't allow parent to intercept touch (e.g. like NavigationDrawer does)
// otherwise swipe would not be working.
parent.requestDisallowInterceptTouchEvent(true);
}
if (Math.abs(deltaX) > mSlop && Math.abs(deltaY) < Math.abs(deltaX) / 2) {
mSwiping = true;
mListView.requestDisallowInterceptTouchEvent(true);
// Cancel ListView's touch (un-highlighting the item)
MotionEvent cancelEvent = MotionEvent.obtain(ev);
cancelEvent.setAction(MotionEvent.ACTION_CANCEL
| (ev.getActionIndex()
<< MotionEvent.ACTION_POINTER_INDEX_SHIFT));
mListView.onTouchEvent(cancelEvent);
}
} else {
// If we swiped into wrong direction, act like this was the new
// touch down point
mDownX = ev.getRawX();
deltaX = 0;
}
if (mSwiping) {
ViewCompat.setTranslationX(mSwipeDownView, deltaX);
ViewCompat.setAlpha(mSwipeDownView, Math.max(0f, Math.min(1f,
1f - 2f * Math.abs(deltaX) / mViewWidth)));
return true;
}
break;
}
}
return false;
}
/**
* Animate the dismissed list item to zero-height and fire the dismiss callback when
* all dismissed list item animations have completed.
*
* @param dismissView The view that has been slided out.
* @param listItemView The list item view. This is the whole view of the list item, and not just
* the part, that the user swiped.
* @param dismissPosition The position of the view inside the list.
*/
private void performDismiss(final View dismissView, final View listItemView, final int dismissPosition) {
final ViewGroup.LayoutParams lp = listItemView.getLayoutParams();
final int originalLayoutHeight = lp.height;
if (android.os.Build.VERSION.SDK_INT < 12) {
mPendingDismisses.add(new PendingDismissData(dismissPosition, dismissView, listItemView));
finishDismiss(dismissView, originalLayoutHeight);
} else {
int originalHeight = listItemView.getHeight();
ValueAnimator animator = ValueAnimator.ofInt(originalHeight, 1).setDuration(mAnimationTime);
animator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
finishDismiss(dismissView, originalLayoutHeight);
}
});
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
lp.height = (Integer) valueAnimator.getAnimatedValue();
listItemView.setLayoutParams(lp);
}
});
mPendingDismisses.add(new PendingDismissData(dismissPosition, dismissView, listItemView));
animator.start();
}
}
private void finishDismiss(View dismissView, int originalLayoutHeight) {
// Make sure no other animation is running. Remove animation from running list, that just finished
boolean noAnimationLeft;
synchronized (mAnimationLock) {
--mDismissAnimationRefCount;
mAnimatedViews.remove(dismissView);
noAnimationLeft = mDismissAnimationRefCount == 0;
}
if (noAnimationLeft) {
// No active animations, process all pending dismisses.
for (PendingDismissData dismiss : mPendingDismisses) {
if (mUndoStyle == UndoStyle.SINGLE_POPUP) {
for (Undoable undoable : mUndoActions) {
undoable.discard();
}
mUndoActions.clear();
}
Undoable undoable = mCallbacks.onDismiss(dismiss.position);
if (undoable != null) {
mUndoActions.add(undoable);
}
mValidDelayedMsgId++;
}
if (!mUndoActions.isEmpty()) {
changePopupText();
changeButtonLabel();
// Show undo popup
float yLocationOffset = mListView.getResources().getDimension(R.dimen.undo_bottom_offset);
mUndoPopup.setWidth((int) Math.min(mScreenDensity * 400, mListView.getWidth() * 0.9f));
mUndoPopup.showAtLocation(mListView,
Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM,
0, (int) yLocationOffset);
// Queue the dismiss only if required
if (!mTouchBeforeAutoHide) {
// Send a delayed message to hide popup
mHideUndoHandler.sendMessageDelayed(mHideUndoHandler.obtainMessage(mValidDelayedMsgId),
mUndoHideDelay);
}
}
ViewGroup.LayoutParams lp;
for (PendingDismissData pendingDismiss : mPendingDismisses) {
ViewCompat.setAlpha(pendingDismiss.view, 1f);
ViewCompat.setTranslationX(pendingDismiss.view, 0);
lp = pendingDismiss.childView.getLayoutParams();
lp.height = originalLayoutHeight;
pendingDismiss.childView.setLayoutParams(lp);
}
mPendingDismisses.clear();
}
}
/**
* Changes the text of the undo popup. If more then one item can be undone, the number of deleted
* items will be shown. If only one deletion can be undone, the title of this deletion (or a default
* string in case the title is {@code null}) will be shown.
*/
private void changePopupText() {
String msg = null;
if (mUndoActions.size() > 1) {
msg = mUndoActions.size() + " " + mListView.getResources().getString(R.string.n_items_removed);
} else if (mUndoActions.size() >= 1) {
// Set title from single undoable or when no multiple deletion string
// is given
msg = mUndoActions.get(mUndoActions.size() - 1).getTitle();
if (msg == null) {
msg = mListView.getResources().getString(R.string.item_removed);
}
}
mUndoPopupTextView.setText(msg);
}
/**
* Changes the label of the undo button.
*/
private void changeButtonLabel() {
String msg;
if (mUndoActions.size() > 1 && mUndoStyle == UndoStyle.COLLAPSED_POPUP) {
msg = mListView.getResources().getString(R.string.shared_string_undo_all);
} else {
msg = mListView.getResources().getString(R.string.shared_string_undo);
}
mUndoButton.setText(msg);
}
private boolean isSwipeDirectionValid(float deltaX) {
int rtlSign = 1;
// On API level 17 and above, check if we are in a Right-To-Left layout
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
if (mListView.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL) {
rtlSign = -1;
}
}
// Check if swipe has been done in the correct direction
switch (mSwipeDirection) {
default:
case BOTH:
return true;
case START:
return rtlSign * deltaX < 0;
case END:
return rtlSign * deltaX > 0;
}
}
}