onCompltion Listener added

app/src/main/java/com/masoudss/activity/MainActivity.kt

@@ -15,6 +15,7 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.core.content.ContextCompat
 import com.masoudss.R
 import com.masoudss.databinding.ActivityMainBinding
+import com.masoudss.lib.DrawCompletionListener
 import com.masoudss.lib.SeekBarOnProgressChanged
 import com.masoudss.lib.WaveformSeekBar
 import com.masoudss.lib.utils.Utils
@@ -54,6 +55,11 @@ class MainActivity : AppCompatActivity() {
                         binding.waveProgress.progress = progress.toInt()
                 }
             }
+            onCompletionListener = object : DrawCompletionListener {
+                override fun onDrawComplete() {
+                    Toast.makeText(this@MainActivity, "onDrawComplete", Toast.LENGTH_SHORT).show()
+                }
+            }
         }
 
         binding.waveWidth.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {

lib/src/main/java/com/masoudss/lib/DrawCompletionListener.kt

@@ -0,0 +1,5 @@
+package com.masoudss.lib
+
+interface DrawCompletionListener {
+    fun onDrawComplete()
+}

lib/src/main/java/com/masoudss/lib/WaveformSeekBar.kt

@@ -35,8 +35,10 @@ open class WaveformSeekBar @JvmOverloads constructor(
     private var mAlreadyMoved = false
     private lateinit var progressBitmap: Bitmap
     private lateinit var progressShader: Shader
+    private var mOnCompleteCalled = false
 
     var onProgressChanged: SeekBarOnProgressChanged? = null
+    var onCompletionListener: DrawCompletionListener? = null
 
     var sample: IntArray? = null
         set(value) {
@@ -367,6 +369,11 @@ open class WaveformSeekBar @JvmOverloads constructor(
                 canvas.drawText(it.value, markerTextDistance, markerTextXPosition, mMarkerPaint)
                 canvas.rotate(-90f)
             }
+
+            if(!mOnCompleteCalled) {
+                mOnCompleteCalled = true
+                onCompletionListener?.onDrawComplete()
+            }
         }
     }