1 /*
2  * Copyright (C) 2019 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License
15  */
16 
17 package com.android.systemui.statusbar.phone;
18 
19 /**
20  * Panel and QS expansion callbacks.
21  */
22 public interface PanelExpansionListener {
23     /**
24      * Invoked whenever the notification panel expansion changes, at every animation frame.
25      * This is the main expansion that happens when the user is swiping up to dismiss the
26      * lock screen.
27      *
28      * @param expansion 0 when collapsed, 1 when expanded.
29      * @param tracking {@code true} when the user is actively dragging the panel.
30      */
onPanelExpansionChanged(float expansion, boolean tracking)31     void onPanelExpansionChanged(float expansion, boolean tracking);
32 
33     /**
34      * Invoked whenever the QS expansion changes, at every animation frame.
35      * @param expansion 0 when collapsed, 1 when expanded.
36      */
onQsExpansionChanged(float expansion)37     default void onQsExpansionChanged(float expansion) {};
38 }
39