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Update SimpleItemTouchHelperCallback.java (#3719)

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any116
2024-10-21 14:04:24 +08:00
committed by GitHub
parent 5a5f911453
commit c4847eb3de
1 changed files with 58 additions and 28 deletions
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86
V2rayNG/app/src/main/java/com/v2ray/ang/helper/SimpleItemTouchHelperCallback.java
View File

@@ -16,14 +16,14 @@
package com.v2ray.ang.helper;
import android.animation.ValueAnimator;
import android.graphics.Canvas;
import android.view.animation.DecelerateInterpolator;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.ItemTouchHelper;
import androidx.recyclerview.widget.RecyclerView;
import org.jetbrains.annotations.NotNull;
/**
* An implementation of {@link ItemTouchHelper.Callback} that enables basic drag & drop and
* swipe-to-dismiss. Drag events are automatically started by an item long-press.<br/>
@@ -36,9 +36,12 @@ import org.jetbrains.annotations.NotNull;
*/
public class SimpleItemTouchHelperCallback extends ItemTouchHelper.Callback {
public static final float ALPHA_FULL = 1.0f;
private static final float ALPHA_FULL = 1.0f;
private static final float SWIPE_THRESHOLD = 0.25f;
private static final long ANIMATION_DURATION = 200;
private final ItemTouchHelperAdapter mAdapter;
private ValueAnimator mReturnAnimator;
public SimpleItemTouchHelperCallback(ItemTouchHelperAdapter adapter) {
mAdapter = adapter;
@@ -51,15 +54,14 @@ public class SimpleItemTouchHelperCallback extends ItemTouchHelper.Callback {
@Override
public boolean isItemViewSwipeEnabled() {
return false;
return true;
}
@Override
public int getMovementFlags(RecyclerView recyclerView, @NotNull RecyclerView.ViewHolder viewHolder) {
// Set movement flags based on the layout manager
public int getMovementFlags(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) {
if (recyclerView.getLayoutManager() instanceof GridLayoutManager) {
final int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
final int swipeFlags = 0;
final int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
return makeMovementFlags(dragFlags, swipeFlags);
} else {
final int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
@@ -69,61 +71,89 @@ public class SimpleItemTouchHelperCallback extends ItemTouchHelper.Callback {
}
@Override
public boolean onMove(@NotNull RecyclerView recyclerView, RecyclerView.ViewHolder source, RecyclerView.ViewHolder target) {
public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder source, @NonNull RecyclerView.ViewHolder target) {
if (source.getItemViewType() != target.getItemViewType()) {
return false;
}
// Notify the adapter of the move
mAdapter.onItemMove(source.getBindingAdapterPosition(), target.getBindingAdapterPosition());
return true;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int i) {
// Notify the adapter of the dismissal
mAdapter.onItemDismiss(viewHolder.getBindingAdapterPosition());
public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
// 不执行删除操作，仅返回项目到原位
returnViewToOriginalPosition(viewHolder);
}
@Override
public void onChildDraw(@NotNull Canvas c, @NotNull RecyclerView recyclerView, @NotNull RecyclerView.ViewHolder viewHolder, float dX,
float dY, int actionState, boolean isCurrentlyActive) {
public void onChildDraw(@NonNull Canvas c, @NonNull RecyclerView recyclerView,
@NonNull RecyclerView.ViewHolder viewHolder,
float dX, float dY, int actionState, boolean isCurrentlyActive) {
if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
// Fade out the view as it is swiped out of the parent's bounds
final float alpha = ALPHA_FULL - Math.abs(dX) / (float) viewHolder.itemView.getWidth();
float maxSwipeDistance = viewHolder.itemView.getWidth() * SWIPE_THRESHOLD;
float swipeAmount = Math.abs(dX);
float direction = Math.signum(dX);
// 限制最大滑动距离
float translationX = Math.min(swipeAmount, maxSwipeDistance) * direction;
float alpha = ALPHA_FULL - Math.min(swipeAmount, maxSwipeDistance) / maxSwipeDistance;
viewHolder.itemView.setTranslationX(translationX);
viewHolder.itemView.setAlpha(alpha);
viewHolder.itemView.setTranslationX(dX);
if (swipeAmount >= maxSwipeDistance && isCurrentlyActive) {
returnViewToOriginalPosition(viewHolder);
}
} else {
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
}
private void returnViewToOriginalPosition(RecyclerView.ViewHolder viewHolder) {
if (mReturnAnimator != null && mReturnAnimator.isRunning()) {
mReturnAnimator.cancel();
}
mReturnAnimator = ValueAnimator.ofFloat(viewHolder.itemView.getTranslationX(), 0f);
mReturnAnimator.addUpdateListener(animation -> {
float value = (float) animation.getAnimatedValue();
viewHolder.itemView.setTranslationX(value);
viewHolder.itemView.setAlpha(1f - Math.abs(value) / (viewHolder.itemView.getWidth() * SWIPE_THRESHOLD));
});
mReturnAnimator.setInterpolator(new DecelerateInterpolator());
mReturnAnimator.setDuration(ANIMATION_DURATION);
mReturnAnimator.start();
}
@Override
public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
// We only want the active item to change
if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
if (viewHolder instanceof ItemTouchHelperViewHolder) {
// Let the view holder know that this item is being moved or dragged
ItemTouchHelperViewHolder itemViewHolder = (ItemTouchHelperViewHolder) viewHolder;
itemViewHolder.onItemSelected();
}
}
super.onSelectedChanged(viewHolder, actionState);
}
@Override
public void clearView(@NotNull RecyclerView recyclerView, @NotNull RecyclerView.ViewHolder viewHolder) {
public void clearView(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) {
super.clearView(recyclerView, viewHolder);
mAdapter.onItemMoveCompleted();
viewHolder.itemView.setAlpha(ALPHA_FULL);
if (viewHolder instanceof ItemTouchHelperViewHolder) {
// Tell the view holder it's time to restore the idle state
ItemTouchHelperViewHolder itemViewHolder = (ItemTouchHelperViewHolder) viewHolder;
itemViewHolder.onItemClear();
}
mAdapter.onItemMoveCompleted();
}
@Override
public float getSwipeThreshold(@NonNull RecyclerView.ViewHolder viewHolder) {
return 1.1f; // 设置一个大于1的值，确保不会触发默认的滑动删除操作
}
@Override
public float getSwipeEscapeVelocity(float defaultValue) {
return defaultValue * 10; // 增加滑动逃逸速度，使得更难触发滑动
}
}