403 lines
16 KiB
Java
403 lines
16 KiB
Java
/*
|
|
* Twidere - Twitter client for Android
|
|
*
|
|
* Copyright (C) 2012-2015 Mariotaku Lee <mariotaku.lee@gmail.com>
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
package org.mariotaku.twidere.util;
|
|
|
|
import android.animation.Animator;
|
|
import android.animation.AnimatorListenerAdapter;
|
|
import android.animation.ValueAnimator;
|
|
import android.graphics.Rect;
|
|
import android.os.SystemClock;
|
|
import android.support.annotation.NonNull;
|
|
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.ListView;
|
|
|
|
import java.util.ArrayList;
|
|
import java.util.Collections;
|
|
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/>
|
|
* <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>
|
|
*/
|
|
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<>();
|
|
private int mDismissAnimationRefCount = 0;
|
|
private float mDownX;
|
|
private float mDownY;
|
|
private boolean mSwiping;
|
|
private int mSwipingSlop;
|
|
private VelocityTracker mVelocityTracker;
|
|
private int mDownPosition;
|
|
private View mDownView;
|
|
private boolean mPaused;
|
|
|
|
/**
|
|
* 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) {
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
// TODO: ensure this is a finger, and set a flag
|
|
|
|
// 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;
|
|
for (int i = 0; i < childCount; i++) {
|
|
child = mListView.getChildAt(i);
|
|
child.getHitRect(rect);
|
|
if (rect.contains(x, y)) {
|
|
mDownView = child;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (mDownView != null) {
|
|
mDownX = motionEvent.getRawX();
|
|
mDownY = motionEvent.getRawY();
|
|
mDownPosition = mListView.getPositionForView(mDownView);
|
|
if (mCallbacks.canDismiss(mDownPosition)) {
|
|
mVelocityTracker = VelocityTracker.obtain();
|
|
mVelocityTracker.addMovement(motionEvent);
|
|
} else {
|
|
mDownView = null;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
case MotionEvent.ACTION_CANCEL: {
|
|
if (mVelocityTracker == null) {
|
|
break;
|
|
}
|
|
|
|
if (mDownView != null && mSwiping) {
|
|
// cancel
|
|
mDownView.animate()
|
|
.translationX(0)
|
|
.alpha(1)
|
|
.setDuration(mAnimationTime)
|
|
.setListener(null);
|
|
}
|
|
mVelocityTracker.recycle();
|
|
mVelocityTracker = null;
|
|
mDownX = 0;
|
|
mDownY = 0;
|
|
mDownView = null;
|
|
mDownPosition = ListView.INVALID_POSITION;
|
|
mSwiping = false;
|
|
break;
|
|
}
|
|
|
|
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;
|
|
boolean dismissRight = false;
|
|
if (Math.abs(deltaX) > mViewWidth / 2 && mSwiping) {
|
|
dismiss = true;
|
|
dismissRight = deltaX > 0;
|
|
} else if (mMinFlingVelocity <= absVelocityX && absVelocityX <= mMaxFlingVelocity
|
|
&& absVelocityY < absVelocityX && mSwiping) {
|
|
// dismiss only if flinging in the same direction as dragging
|
|
dismiss = (velocityX < 0) == (deltaX < 0);
|
|
dismissRight = mVelocityTracker.getXVelocity() > 0;
|
|
}
|
|
if (dismiss && mDownPosition != ListView.INVALID_POSITION) {
|
|
// dismiss
|
|
final View downView = mDownView; // mDownView gets null'd before animation ends
|
|
final int downPosition = mDownPosition;
|
|
++mDismissAnimationRefCount;
|
|
mDownView.animate()
|
|
.translationX(dismissRight ? mViewWidth : -mViewWidth)
|
|
.alpha(0)
|
|
.setDuration(mAnimationTime)
|
|
.setListener(new AnimatorListenerAdapter() {
|
|
@Override
|
|
public void onAnimationEnd(Animator animation) {
|
|
performDismiss(downView, downPosition);
|
|
}
|
|
});
|
|
} else {
|
|
// cancel
|
|
mDownView.animate()
|
|
.translationX(0)
|
|
.alpha(1)
|
|
.setDuration(mAnimationTime)
|
|
.setListener(null);
|
|
}
|
|
mVelocityTracker.recycle();
|
|
mVelocityTracker = null;
|
|
mDownX = 0;
|
|
mDownY = 0;
|
|
mDownView = null;
|
|
mDownPosition = ListView.INVALID_POSITION;
|
|
mSwiping = false;
|
|
break;
|
|
}
|
|
|
|
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) {
|
|
mDownView.setTranslationX(deltaX - mSwipingSlop);
|
|
mDownView.setAlpha(Math.max(0f, Math.min(1f,
|
|
1f - 2f * Math.abs(deltaX) / mViewWidth)));
|
|
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(@NonNull PendingDismissData other) {
|
|
// Sort by descending position
|
|
return other.position - position;
|
|
}
|
|
}
|
|
|
|
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) {
|
|
--mDismissAnimationRefCount;
|
|
if (mDismissAnimationRefCount == 0) {
|
|
// No active animations, process all pending dismisses.
|
|
// Sort by descending position
|
|
Collections.sort(mPendingDismisses);
|
|
|
|
int[] dismissPositions = new int[mPendingDismisses.size()];
|
|
for (int i = mPendingDismisses.size() - 1; i >= 0; i--) {
|
|
dismissPositions[i] = mPendingDismisses.get(i).position;
|
|
}
|
|
mCallbacks.onDismiss(mListView, dismissPositions);
|
|
|
|
// Reset mDownPosition to avoid MotionEvent.ACTION_UP trying to start a dismiss
|
|
// animation with a stale position
|
|
mDownPosition = ListView.INVALID_POSITION;
|
|
|
|
ViewGroup.LayoutParams lp;
|
|
for (PendingDismissData pendingDismiss : mPendingDismisses) {
|
|
// Reset view presentation
|
|
pendingDismiss.view.setAlpha(1f);
|
|
pendingDismiss.view.setTranslationX(0);
|
|
lp = pendingDismiss.view.getLayoutParams();
|
|
lp.height = originalHeight;
|
|
pendingDismiss.view.setLayoutParams(lp);
|
|
}
|
|
|
|
// Send a cancel event
|
|
long time = SystemClock.uptimeMillis();
|
|
MotionEvent cancelEvent = MotionEvent.obtain(time, time,
|
|
MotionEvent.ACTION_CANCEL, 0, 0, 0);
|
|
mListView.dispatchTouchEvent(cancelEvent);
|
|
|
|
mPendingDismisses.clear();
|
|
}
|
|
}
|
|
});
|
|
|
|
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();
|
|
}
|
|
} |