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Add callback aboutToDismiss in SwipeDismissListViewTouchListener #19

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Add callback aboutToDismiss in SwipeDismissListViewTouchListener #19

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17 changes: 14 additions & 3 deletions src/com/example/android/swipedismiss/MainActivity.java
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Expand Up @@ -16,6 +16,9 @@

package com.example.android.swipedismiss;

import java.util.ArrayList;
import java.util.Arrays;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
Expand All @@ -25,9 +28,6 @@
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.Arrays;

public class MainActivity extends ListActivity {
ArrayAdapter<String> mAdapter;

Expand Down Expand Up @@ -59,6 +59,17 @@ public void onCreate(Bundle savedInstanceState) {
public boolean canDismiss(int position) {
return true;
}

@Override
public void aboutToDismiss(int position) {
/* Notified before the dismiss actually takes place which alters the positions/data
*
* With more complex data in your cells, this provides the ability to update the
* object based on this position before the list change
*
* if needed adapter.remove(adapter.getItem(position));
*/
}

@Override
public void onDismiss(ListView listView, int[] reverseSortedPositions) {
Expand Down
50 changes: 35 additions & 15 deletions src/com/example/android/swipedismiss/SwipeDismissListViewTouchListener.java
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Expand Up @@ -16,6 +16,10 @@

package com.example.android.swipedismiss;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
Expand All @@ -30,10 +34,6 @@
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
Expand All @@ -50,17 +50,31 @@
* <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();
* }
* });
*
* SwipeDismissListViewTouchListener touchListener = new SwipeDismissListViewTouchListener(listView, new DismissCallbacks() {

@Override
public boolean canDismiss(int position) {
// all cells in the listView can be swiped, make conditional if you like
return true;
}

@Override
public void aboutToDismiss(int position) {
// notified before the dismiss actually takes place which alters the positions/data
// provides ability to update the object based on this position before the list change

// if needed adapter.remove(adapter.getItem(position));

}

@Override
public void onDismiss(ListView listView, int[] reverseSortedPositions) {
// if needed, adapter.notifyDataSetChanged();
}

});
*
* listView.setOnTouchListener(touchListener);
* listView.setOnScrollListener(touchListener.makeScrollListener());
* </pre>
Expand Down Expand Up @@ -106,6 +120,11 @@ public interface DismissCallbacks {
* Called to determine whether the given position can be dismissed.
*/
boolean canDismiss(int position);

/**
* Called right before the dismiss behavior happens
*/
void aboutToDismiss(int position);

/**
* Called when the user has indicated they she would like to dismiss one or more list item
Expand Down Expand Up @@ -341,6 +360,7 @@ public int compareTo(PendingDismissData other) {
}

private void performDismiss(final View dismissView, final int dismissPosition) {
mCallbacks.aboutToDismiss(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.
Expand Down