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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.tabs;
import android.graphics.Canvas;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.view.View;
class TabsTouchHelperCallback extends ItemTouchHelper.Callback {
private final DismissListener dismissListener;
interface DismissListener {
void onItemDismiss(View view);
}
public TabsTouchHelperCallback(DismissListener dismissListener) {
this.dismissListener = dismissListener;
}
@Override
public boolean isItemViewSwipeEnabled() {
return true;
}
@Override
public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
return makeFlag(ItemTouchHelper.ACTION_STATE_SWIPE, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT);
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int i) {
dismissListener.onItemDismiss(viewHolder.itemView);
}
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder,
RecyclerView.ViewHolder target) {
return false;
}
// Alpha on an itemView being swiped should decrease to a min over a distance equal to the
// width of the item being swiped.
@Override
public void onChildDraw(Canvas c,
RecyclerView recyclerView,
RecyclerView.ViewHolder viewHolder,
float dX,
float dY,
int actionState,
boolean isCurrentlyActive) {
if (actionState != ItemTouchHelper.ACTION_STATE_SWIPE) {
return;
}
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
viewHolder.itemView.setAlpha(Math.max(0.1f,
Math.min(1f, 1f - 2f * Math.abs(dX) / viewHolder.itemView.getWidth())));
}
public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
super.clearView(recyclerView, viewHolder);
viewHolder.itemView.setAlpha(1);
}
}
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