allow dragging the center item at the ReminderActivity

app/src/main/kotlin/com/simplemobiletools/clock/activities/ReminderActivity.kt

@@ -6,6 +6,7 @@ import android.media.MediaPlayer
 import android.net.Uri
 import android.os.Bundle
 import android.os.Handler
+import android.view.MotionEvent
 import android.view.animation.AnimationUtils
 import com.simplemobiletools.clock.R
 import com.simplemobiletools.clock.extensions.*
@@ -16,7 +17,6 @@ import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.commons.helpers.MINUTE_SECONDS
 import kotlinx.android.synthetic.main.activity_reminder.*
 
-
 class ReminderActivity : SimpleActivity() {
     private val INCREASE_VOLUME_DELAY = 3000L
 
@@ -26,6 +26,7 @@ class ReminderActivity : SimpleActivity() {
     private var alarm: Alarm? = null
     private var mediaPlayer: MediaPlayer? = null
     private var lastVolumeValue = 0.1f
+    private var dragDownX = 0f
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -64,8 +65,26 @@ class ReminderActivity : SimpleActivity() {
     private fun setupButtons() {
         reminder_draggable_background.startAnimation(AnimationUtils.loadAnimation(this, R.anim.pulsing_animation))
         reminder_draggable_background.applyColorFilter(getAdjustedPrimaryColor())
+        var minDragX = 0f
+        var maxDragX = 0f
 
-        reminder_stop.setOnClickListener {
+        reminder_dismiss.onGlobalLayout {
+            minDragX = reminder_snooze.left.toFloat()
+            maxDragX = reminder_dismiss.left.toFloat()
+        }
+
+        reminder_draggable.setOnTouchListener { v, event ->
+            when (event.action) {
+                MotionEvent.ACTION_DOWN -> dragDownX = event.x
+                MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> dragDownX = 0f
+                MotionEvent.ACTION_MOVE -> {
+                    reminder_draggable.x = Math.min(maxDragX, Math.max(minDragX, event.rawX - dragDownX))
+                }
+            }
+            true
+        }
+
+        reminder_dismiss.setOnClickListener {
             finish()
         }
 

app/src/main/res/layout/activity_reminder.xml

@@ -32,7 +32,6 @@
 
     <ImageView
         android:id="@+id/reminder_snooze"
-        style="@style/MyBorderlessBackgroundStyle"
         android:layout_width="@dimen/stopwatch_button_small_size"
         android:layout_height="@dimen/stopwatch_button_small_size"
         android:padding="@dimen/normal_margin"
@@ -52,7 +51,7 @@
         android:padding="@dimen/normal_margin"
         android:src="@drawable/pulsing_background"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toStartOf="@+id/reminder_stop"
+        app:layout_constraintEnd_toStartOf="@+id/reminder_dismiss"
         app:layout_constraintHorizontal_bias="0.5"
         app:layout_constraintStart_toEndOf="@+id/reminder_snooze"
         app:layout_constraintTop_toBottomOf="@+id/reminder_text"/>
@@ -61,17 +60,17 @@
         android:id="@+id/reminder_draggable"
         android:layout_width="@dimen/stopwatch_button_small_size"
         android:layout_height="@dimen/stopwatch_button_small_size"
-        android:layout_marginBottom="16dp"
+        android:layout_marginBottom="@dimen/activity_margin"
         android:padding="@dimen/normal_margin"
-        android:src="@drawable/ic_alarm"
+        android:src="@drawable/ic_alarm_big"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toStartOf="@+id/reminder_stop"
+        app:layout_constraintEnd_toStartOf="@+id/reminder_dismiss"
         app:layout_constraintHorizontal_bias="0.5"
         app:layout_constraintStart_toEndOf="@+id/reminder_snooze"
         app:layout_constraintTop_toBottomOf="@+id/reminder_text"/>
 
     <ImageView
-        android:id="@+id/reminder_stop"
+        android:id="@+id/reminder_dismiss"
         android:layout_width="@dimen/stopwatch_button_small_size"
         android:layout_height="@dimen/stopwatch_button_small_size"
         android:padding="@dimen/normal_margin"