allow adding section headers to the list

app/src/main/kotlin/com/simplemobiletools/calendar/adapters/EventsListAdapter.kt

@@ -5,12 +5,18 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.BaseAdapter
+import android.widget.TextView
 import com.simplemobiletools.calendar.Formatter
 import com.simplemobiletools.calendar.R
-import com.simplemobiletools.calendar.models.Event
+import com.simplemobiletools.calendar.models.ListEvent
+import com.simplemobiletools.calendar.models.ListItem
+import com.simplemobiletools.calendar.models.ListSection
 import kotlinx.android.synthetic.main.event_item.view.*
 
-class EventsListAdapter(context: Context, private val mEvents: List<Event>) : BaseAdapter() {
+class EventsListAdapter(context: Context, private val mEvents: List<ListItem>) : BaseAdapter() {
+    val ITEM_EVENT = 0
+    val ITEM_HEADER = 1
+
     private val mInflater: LayoutInflater
 
     init {
@@ -20,30 +26,50 @@ class EventsListAdapter(context: Context, private val mEvents: List<Event>) : Ba
     override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
         var view = convertView
         val viewHolder: ViewHolder
+        val type = getItemViewType(position)
+
         if (view == null) {
+            if (type == ITEM_EVENT) {
                 view = mInflater.inflate(R.layout.event_item, parent, false)
                 viewHolder = ViewHolder(view)
+            } else {
+                view = mInflater.inflate(R.layout.event_section, parent, false)
+                viewHolder = ViewHolder(view)
+            }
             view!!.tag = viewHolder
         } else {
             viewHolder = view.tag as ViewHolder
         }
 
-        val event = mEvents[position]
+        if (type == ITEM_EVENT) {
+            val item = mEvents[position] as ListEvent
             viewHolder.apply {
-            title.text = event.title
+                title.text = item.title
-            description.text = event.description
+                description?.text = item.description
-            start.text = Formatter.getTime(event.startTS)
+                start?.text = Formatter.getTime(item.startTS)
 
-            if (event.startTS == event.endTS) {
+                if (item.startTS == item.endTS) {
-                end.visibility = View.INVISIBLE
+                    end?.visibility = View.INVISIBLE
                 } else {
-                end.text = Formatter.getTime(event.endTS)
+                    end?.text = Formatter.getTime(item.endTS)
                 }
             }
+        } else {
+            val item = mEvents[position] as ListSection
+            viewHolder.title.text = item.title
+        }
 
         return view
     }
 
+    override fun getItemViewType(position: Int): Int {
+        return if (mEvents[position] is ListEvent) ITEM_EVENT else ITEM_HEADER
+    }
+
+    override fun getViewTypeCount(): Int {
+        return 2
+    }
+
     override fun getCount(): Int {
         return mEvents.size
     }
@@ -53,13 +79,13 @@ class EventsListAdapter(context: Context, private val mEvents: List<Event>) : Ba
     }
 
     override fun getItemId(position: Int): Long {
-        return 0
+        return position.toLong()
     }
 
     class ViewHolder(view: View) {
         val title = view.event_item_title
-        val description = view.event_item_description
+        val description: TextView? = view.event_item_description
-        val start = view.event_item_start
+        val start: TextView? = view.event_item_start
-        val end = view.event_item_end
+        val end: TextView? = view.event_item_end
     }
 }

app/src/main/kotlin/com/simplemobiletools/calendar/fragments/EventListFragment.kt

@@ -7,10 +7,14 @@ import android.view.View
 import android.view.ViewGroup
 import com.simplemobiletools.calendar.DBHelper
 import com.simplemobiletools.calendar.R
-import com.simplemobiletools.calendar.adapters.EventsAdapter
+import com.simplemobiletools.calendar.adapters.EventsListAdapter
 import com.simplemobiletools.calendar.models.Event
+import com.simplemobiletools.calendar.models.ListEvent
+import com.simplemobiletools.calendar.models.ListItem
 import kotlinx.android.synthetic.main.fragment_event_list.view.*
 import org.joda.time.DateTime
+import java.util.*
+import kotlin.comparisons.compareBy
 
 class EventListFragment : Fragment(), DBHelper.GetEventsListener {
     lateinit var mView: View
@@ -28,7 +32,11 @@ class EventListFragment : Fragment(), DBHelper.GetEventsListener {
     }
 
     override fun gotEvents(events: MutableList<Event>) {
-        val eventsAdapter = EventsAdapter(context, events)
+        val listItems = ArrayList<ListItem>(events.size)
+        val sorted = events.sortedWith(compareBy({ it.startTS }, { it.endTS }))
+        sorted.forEach { listItems.add(ListEvent(it.id, it.startTS, it.endTS, it.title, it.description)) }
+
+        val eventsAdapter = EventsListAdapter(context, listItems)
         activity?.runOnUiThread {
             mView.calendar_events_list.adapter = eventsAdapter
         }

app/src/main/kotlin/com/simplemobiletools/calendar/models/ListEvent.kt

@@ -0,0 +1,7 @@
+package com.simplemobiletools.calendar.models
+
+class ListEvent(var id: Int = 0, var startTS: Int = 0, var endTS: Int = 0, var title: String = "", var description: String = "") : ListItem() {
+    override fun toString(): String {
+        return "Event {id=$id, startTS=$startTS, endTS=$endTS, title=$title, description=$description}"
+    }
+}

app/src/main/kotlin/com/simplemobiletools/calendar/models/ListItem.kt

@@ -0,0 +1,3 @@
+package com.simplemobiletools.calendar.models
+
+open class ListItem

app/src/main/kotlin/com/simplemobiletools/calendar/models/ListSection.kt

@@ -0,0 +1,7 @@
+package com.simplemobiletools.calendar.models
+
+class ListSection(val title: String, val isToday: Boolean) : ListItem() {
+    override fun toString(): String {
+        return "ListSection {title=$title, isToday=$isToday}"
+    }
+}

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

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/event_item_title"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:textSize="@dimen/day_text_size"/>