1+ package com.hfad.fancontroller
2+
3+ import android.content.Context
4+ import android.graphics.*
5+ import android.util.AttributeSet
6+ import android.view.View
7+ import android.view.accessibility.AccessibilityNodeInfo
8+ import androidx.core.content.withStyledAttributes
9+ import androidx.core.view.AccessibilityDelegateCompat
10+ import androidx.core.view.ViewCompat
11+ import androidx.core.view.accessibility.AccessibilityNodeInfoCompat
12+ import kotlin.math.cos
13+ import kotlin.math.min
14+ import kotlin.math.sin
15+
16+ private enum class FanSpeed (val label : Int ) {
17+ OFF (R .string.fan_off),
18+ LOW (R .string.fan_low),
19+ MEDIUM (R .string.fan_medium),
20+ HIGH (R .string.fan_high);
21+
22+ fun next () = when (this ) {
23+ OFF -> LOW
24+ LOW -> MEDIUM
25+ MEDIUM -> HIGH
26+ HIGH -> OFF
27+ }
28+ }
29+ private const val RADIUS_OFFSET_LABEL = 30
30+ private const val RADIUS_OFFSET_INDICATOR = - 35
31+
32+ class DialView @JvmOverloads constructor(
33+ context : Context , attrs : AttributeSet ? = null , defStyleAttr : Int = 0
34+ ) : View(context, attrs, defStyleAttr) {
35+ private var radius = 0.0f
36+ private var fanSpeed = FanSpeed .OFF
37+ private val pointPosition: PointF = PointF (0.0f , 0.0f )
38+ private val paint = Paint (Paint .ANTI_ALIAS_FLAG ).apply {
39+ style = Paint .Style .FILL
40+ textAlign = Paint .Align .CENTER
41+ textSize = 55.0f
42+ typeface = Typeface .create(" " Typeface .BOLD )
43+ }
44+ // custom attributes
45+ private var fanSpeedLowColor = 0
46+ private var fanSpeedMediumColor = 0
47+ private var fanSpeedMaxColor = 0
48+
49+ init {
50+ isClickable = true
51+ context.withStyledAttributes(attrs, R .styleable.DialView ) {
52+ fanSpeedLowColor = getColor(R .styleable.DialView_fanColor1 , 0 )
53+ fanSpeedMediumColor = getColor(R .styleable.DialView_fanColor2 , 0 )
54+ fanSpeedMaxColor = getColor(R .styleable.DialView_fanColor3 , 0 )
55+ }
56+ updateContentDescription()
57+
58+ ViewCompat .setAccessibilityDelegate(this , object : AccessibilityDelegateCompat () {
59+ override fun onInitializeAccessibilityNodeInfo (host : View ,
60+ info : AccessibilityNodeInfoCompat ) {
61+ super .onInitializeAccessibilityNodeInfo(host, info)
62+ val customClick = AccessibilityNodeInfoCompat .AccessibilityActionCompat (
63+ AccessibilityNodeInfo .ACTION_CLICK ,
64+ context.getString(if (fanSpeed != FanSpeed .HIGH )
65+ R .string.change else R .string.reset)
66+ )
67+ info.addAction(customClick)
68+ }
69+ })
70+ }
71+
72+ override fun performClick (): Boolean {
73+ if (super .performClick()) return true // calls onClickListener()
74+ fanSpeed = fanSpeed.next()
75+ contentDescription = resources.getString(fanSpeed.label)
76+ updateContentDescription()
77+ invalidate() // redraw
78+ return true
79+ }
80+
81+ override fun onSizeChanged (w : Int , h : Int , oldw : Int , oldh : Int ) {
82+ radius = (min(w, h) / 2.0 * 0.8 ).toFloat()
83+ super .onSizeChanged(w, h, oldw, oldh)
84+ }
85+
86+ override fun onDraw (canvas : Canvas ) {
87+ super .onDraw(canvas)
88+ // paint.color = if (fanSpeed == FanSpeed.OFF) Color.GRAY else Color.GREEN
89+ paint.color = when (fanSpeed) {
90+ FanSpeed .OFF -> Color .GRAY
91+ FanSpeed .LOW -> fanSpeedLowColor
92+ FanSpeed .MEDIUM -> fanSpeedMediumColor
93+ FanSpeed .HIGH -> fanSpeedMaxColor
94+ }
95+ // Draw the dial
96+ canvas.drawCircle((width / 2 ).toFloat(), (height / 2 ).toFloat(), radius, paint)
97+ // Draw the indicator circle
98+ val markerRadius = radius + RADIUS_OFFSET_INDICATOR
99+ pointPosition.computeXYForSpeed(fanSpeed, markerRadius)
100+ paint.color = Color .BLACK
101+ canvas.drawCircle(pointPosition.x, pointPosition.y, radius/ 12 , paint)
102+ // Draw the text labels
103+ val labelRadius = radius + RADIUS_OFFSET_LABEL
104+ for (i in FanSpeed .values()) {
105+ pointPosition.computeXYForSpeed(i, labelRadius)
106+ val label = resources.getString(i.label)
107+ canvas.drawText(label, pointPosition.x, pointPosition.y, paint)
108+ }
109+ }
110+
111+ private fun PointF.computeXYForSpeed (pos : FanSpeed , radius : Float ) {
112+ val startAngle = Math .PI * (9 / 8.0 )
113+ val angle = startAngle + pos.ordinal * (Math .PI / 4 )
114+ x = (radius * cos(angle)).toFloat() + width / 2
115+ y = (radius * sin(angle)).toFloat() + height / 2
116+ }
117+
118+ fun updateContentDescription () {
119+ contentDescription = resources.getString(fanSpeed.label)
120+ }
121+ }
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