| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| package androidx.core.widget; |
| |
| import android.os.Build; |
| import android.view.View.OnTouchListener; |
| import android.widget.PopupMenu; |
| |
| import androidx.annotation.NonNull; |
| import androidx.annotation.Nullable; |
| |
| /** |
| * Helper for accessing features in {@link PopupMenu}. |
| */ |
| public final class PopupMenuCompat { |
| private PopupMenuCompat() { |
| // This class is not publicly instantiable. |
| } |
| |
| /** |
| * On API {@link android.os.Build.VERSION_CODES#KITKAT} and higher, returns |
| * an {@link OnTouchListener} that can be added to the anchor view to |
| * implement drag-to-open behavior. |
| * <p> |
| * When the listener is set on a view, touching that view and dragging |
| * outside of its bounds will open the popup window. Lifting will select the |
| * currently touched list item. |
| * <p> |
| * Example usage: |
| * <pre> |
| * PopupMenu myPopup = new PopupMenu(context, myAnchor); |
| * myAnchor.setOnTouchListener(PopupMenuCompat.getDragToOpenListener(myPopup)); |
| * </pre> |
| * |
| * @param popupMenu the PopupMenu against which to invoke the method |
| * @return a touch listener that controls drag-to-open behavior, or {@code null} on |
| * unsupported APIs |
| */ |
| @Nullable |
| public static OnTouchListener getDragToOpenListener(@NonNull Object popupMenu) { |
| if (Build.VERSION.SDK_INT >= 19) { |
| return ((PopupMenu) popupMenu).getDragToOpenListener(); |
| } else { |
| return null; |
| } |
| } |
| } |