1 /*
2  * Copyright (C) 2021 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.car.hvac;
18 
19 import android.content.Context;
20 import android.util.AttributeSet;
21 import android.view.KeyEvent;
22 import android.view.MotionEvent;
23 
24 import androidx.annotation.Nullable;
25 import androidx.constraintlayout.widget.ConstraintLayout;
26 
27 /** A view that contains interfaces for the HVAC Panel application and intercepts the key events. */
28 public class HvacPanelView extends ConstraintLayout {
29     private KeyEventHandler mKeyEventHandler;
30     private MotionEventHandler mMotionEventHandler;
31 
HvacPanelView(Context context)32     public HvacPanelView(Context context) {
33         super(context);
34     }
35 
HvacPanelView(Context context, @Nullable AttributeSet attrs)36     public HvacPanelView(Context context, @Nullable AttributeSet attrs) {
37         super(context, attrs);
38     }
39 
HvacPanelView(Context context, @Nullable AttributeSet attrs, int defStyleAttr)40     public HvacPanelView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
41         super(context, attrs, defStyleAttr);
42     }
43 
HvacPanelView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)44     public HvacPanelView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
45         super(context, attrs, defStyleAttr, defStyleRes);
46     }
47 
48     @Override
onInterceptTouchEvent(MotionEvent ev)49     public boolean onInterceptTouchEvent(MotionEvent ev) {
50         boolean result = super.onInterceptTouchEvent(ev);
51 
52         if (mMotionEventHandler != null) {
53             mMotionEventHandler.onInterceptTouchEvent(ev);
54         }
55 
56         return result;
57     }
58 
59     @Override
dispatchKeyEvent(KeyEvent event)60     public boolean dispatchKeyEvent(KeyEvent event) {
61         if (super.dispatchKeyEvent(event)) {
62             return true;
63         }
64 
65         if (mKeyEventHandler != null) {
66             return mKeyEventHandler.dispatchKeyEvent(event);
67         }
68 
69         return false;
70     }
71 
72     /** Sets a {@link KeyEventHandler} to help interact with the HVAC panel. */
setKeyEventHandler(KeyEventHandler keyEventHandler)73     public void setKeyEventHandler(KeyEventHandler keyEventHandler) {
74         mKeyEventHandler = keyEventHandler;
75     }
76 
77     /** An interface to help interact with the HVAC panel. */
78     public interface KeyEventHandler {
79         /**
80          * Allows handling of a {@link KeyEvent} if it wasn't already handled by the superclass.
81          * Returns {@code true} if the event was handled and false otherwise.
82          */
dispatchKeyEvent(KeyEvent event)83         boolean dispatchKeyEvent(KeyEvent event);
84     }
85 
86     /** Sets a {@link MotionEventHandler} to help process motion events in the HVAC panel. */
setMotionEventHandler(MotionEventHandler motionEventHandler)87     public void setMotionEventHandler(MotionEventHandler motionEventHandler) {
88         mMotionEventHandler = motionEventHandler;
89     }
90 
91     /** An interface to help process motion events in the HVAC panel. */
92     public interface MotionEventHandler {
93         /**
94          * Intercepts incoming events of type {@link MotionEvent}. This can be used to know when the
95          * last interaction with the HVAC panel might have happened.
96          */
onInterceptTouchEvent(MotionEvent event)97         void onInterceptTouchEvent(MotionEvent event);
98     }
99 }
100