SalesProgressView.kt

package dev.arpan.ui.widget

import android.content.Context
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Paint
import android.graphics.RectF
import android.os.Parcel
import android.os.Parcelable
import android.util.AttributeSet
import android.view.View
import androidx.core.graphics.withTranslation
import kotlin.math.cos
import kotlin.math.max
import kotlin.math.min
import kotlin.math.sin

class SalesProgressView @JvmOverloads constructor(
    context: Context,
    attributeSet: AttributeSet? = null
) : View(context, attributeSet) {

    private val rectF = RectF()
    private val indicatorRectF = RectF()

    private val strokeWidth = 2f.dp
    private val indicatorSize = 12f.dp
    private val indicatorStrokeWidth = 1f.dp

    private val backgroundPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
        style = Paint.Style.FILL
        color = Color.argb(0x66, 0xFF, 0xFF, 0xFF)
    }

    private val strokeBackgroundPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
        style = Paint.Style.STROKE
        strokeWidth = this@SalesProgressView.strokeWidth
        strokeCap = Paint.Cap.ROUND
        color = Color.WHITE
    }

    private val strokePaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
        style = Paint.Style.STROKE
        strokeWidth = this@SalesProgressView.strokeWidth
        strokeCap = Paint.Cap.ROUND
        color = Color.rgb(0xFF, 0x75, 0x41)
    }

    private val indicatorFillPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
        style = Paint.Style.FILL
        color = Color.WHITE
    }

    private val indicatorStrokePaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
        style = Paint.Style.STROKE
        strokeWidth = this@SalesProgressView.indicatorStrokeWidth
        color = Color.rgb(0xFF, 0x75, 0x41)
    }

    var progress: Float = 0f
        set(value) {
            field = value.coerceAtMost(100f)
            invalidate()
        }

    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        val height = getDefaultSize(suggestedMinimumHeight, heightMeasureSpec)
        val width = getDefaultSize(suggestedMinimumWidth, widthMeasureSpec)
        val min = min(width, height)
        setMeasuredDimension(min, min)

        val halfStrokeWidth = strokeWidth / 2f
        val halfIndicatorWidth = indicatorSize / 2f
        val halfFinal = max(halfStrokeWidth, halfIndicatorWidth)

        rectF.set(
            halfFinal,
            halfFinal,
            min - halfFinal,
            min - halfFinal
        )

        val halfIndicatorStrokeWidth = indicatorStrokeWidth / 2f

        indicatorRectF.set(
            -halfIndicatorWidth + halfIndicatorStrokeWidth,
            -halfIndicatorWidth + halfIndicatorStrokeWidth,
            halfIndicatorWidth - halfIndicatorStrokeWidth,
            halfIndicatorWidth - halfIndicatorStrokeWidth
        )
    }

    override fun onDraw(canvas: Canvas) {
        super.onDraw(canvas)

        val startAngle = -90f
        val angle = 360 * progress / 100f
        val radius = rectF.width() / 2f

        canvas.drawOval(rectF, backgroundPaint)
        canvas.drawOval(rectF, strokeBackgroundPaint)
        canvas.drawArc(rectF, startAngle, angle, false, strokePaint)

        val x = (radius * cos(Math.toRadians(angle + startAngle * 1.0)).toFloat()) + rectF.centerX()
        val y = (radius * sin(Math.toRadians(angle + startAngle * 1.0)).toFloat()) + rectF.centerY()

        canvas.withTranslation(x, y) {
            canvas.drawOval(indicatorRectF, indicatorFillPaint)
            canvas.drawOval(indicatorRectF, indicatorStrokePaint)
        }
    }

    override fun onSaveInstanceState(): Parcelable? {
        val superState = super.onSaveInstanceState()
        val savedState = SavedState(superState)
        savedState.progress = this.progress
        return savedState
    }

    override fun onRestoreInstanceState(state: Parcelable?) {
        state as SavedState
        super.onRestoreInstanceState(state.superState)
        progress = state.progress
    }

    private class SavedState : BaseSavedState {
        var progress: Float = 0F

        constructor(parcelable: Parcelable?) : super(parcelable)

        private constructor(parcel: Parcel) : super(parcel) {
            progress = parcel.readFloat()
        }

        override fun writeToParcel(parcel: Parcel, flags: Int) {
            super.writeToParcel(parcel, flags)
            parcel.writeFloat(progress)
        }

        override fun describeContents(): Int {
            return 0
        }

        companion object CREATOR : Parcelable.Creator<SavedState> {
            override fun createFromParcel(parcel: Parcel): SavedState {
                return SavedState(parcel)
            }

            override fun newArray(size: Int): Array<SavedState?> {
                return arrayOfNulls(size)
            }
        }
    }

    private val Float.dp: Float get() = this * resources.displayMetrics.density
}