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.panelstate;
18 
19 /** A listener interface to be notified of expansion events for the notification panel. */
20 public interface PanelExpansionListener {
21     /**
22      * Invoked whenever the notification panel expansion changes, at every animation frame.
23      * This is the main expansion that happens when the user is swiping up to dismiss the
24      * lock screen and swiping to pull down the notification shade.
25      *
26      * @param fraction 0 when collapsed, 1 when fully expanded.
27      * @param expanded true if the panel should be considered expanded.
28      * @param tracking {@code true} when the user is actively dragging the panel.
29      */
onPanelExpansionChanged(float fraction, boolean expanded, boolean tracking)30     void onPanelExpansionChanged(float fraction, boolean expanded, boolean tracking);
31 }
32