From 85266131896139a179327e283fa9e26b42c0f3a1 Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Sat, 18 Aug 2018 17:46:28 -0400
Subject: [PATCH] Add infinite scrolling and pull to refresh to timeline

---
 Tusker/Storyboards/Statuses.storyboard        |  6 ++
 .../StatusesTableViewController.swift         | 99 +++++++++----------
 2 files changed, 52 insertions(+), 53 deletions(-)

diff --git a/Tusker/Storyboards/Statuses.storyboard b/Tusker/Storyboards/Statuses.storyboard
index f4ca6ff3..705c9242 100644
--- a/Tusker/Storyboards/Statuses.storyboard
+++ b/Tusker/Storyboards/Statuses.storyboard
@@ -68,6 +68,12 @@
                     </tableView>
                     <navigationItem key="navigationItem" id="SQS-FM-ReS"/>
                     <simulatedTabBarMetrics key="simulatedBottomBarMetrics"/>
+                    <refreshControl key="refreshControl" opaque="NO" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO" enabled="NO" contentHorizontalAlignment="center" contentVerticalAlignment="center" id="K3b-fx-67z">
+                        <autoresizingMask key="autoresizingMask"/>
+                        <connections>
+                            <action selector="refreshStatuses:" destination="6nb-nb-cMm" eventType="valueChanged" id="ndM-Yv-ISu"/>
+                        </connections>
+                    </refreshControl>
                 </tableViewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="5GO-2u-UCr" userLabel="First Responder" sceneMemberID="firstResponder"/>
             </objects>
diff --git a/Tusker/View Controllers/StatusesTableViewController.swift b/Tusker/View Controllers/StatusesTableViewController.swift
index 9fc79b04..2280ace8 100644
--- a/Tusker/View Controllers/StatusesTableViewController.swift	
+++ b/Tusker/View Controllers/StatusesTableViewController.swift	
@@ -20,26 +20,38 @@ class StatusesTableViewController: UITableViewController {
         }
     }
     
+    var newer: RequestRange?
+    var older: RequestRange?
+    
     override func viewWillAppear(_ animated: Bool) {
         MastodonController.shared.client.run(Timelines.home()) { result in
-            guard case let .success(statuses, _) = result else { fatalError() }
+            guard case let .success(statuses, pagination) = result else { fatalError() }
             self.statuses = statuses
+            self.newer = pagination?.previous
+            self.older = pagination?.next
+            DispatchQueue.main.async {
+                self.tableView.reloadData()
+            }
         }
     }
     
     override func viewDidLoad() {
         super.viewDidLoad()
-
+        
         tableView.rowHeight = UITableView.automaticDimension
         tableView.estimatedRowHeight = 140
-        
-        // Uncomment the following line to preserve selection between presentations
-        // self.clearsSelectionOnViewWillAppear = false
-
-        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
-        // self.navigationItem.rightBarButtonItem = self.editButtonItem
     }
 
+    /*
+     // MARK: - Navigation
+     
+     // In a storyboard-based application, you will often want to do a little preparation before navigation
+     override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
+     // Get the new view controller using segue.destination.
+     // Pass the selected object to the new view controller.
+     }
+     */
+    
     // MARK: - Table view data source
 
     override func numberOfSections(in tableView: UITableView) -> Int {
@@ -47,7 +59,6 @@ class StatusesTableViewController: UITableViewController {
     }
 
     override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-        // #warning Incomplete implementation, return the number of rows
         return statuses.count
     }
 
@@ -63,51 +74,33 @@ class StatusesTableViewController: UITableViewController {
 
         return cell
     }
- 
-
-    /*
-    // Override to support conditional editing of the table view.
-    override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
-        // Return false if you do not want the specified item to be editable.
-        return true
+    
+    override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
+        if indexPath.row == statuses.count - 1 {
+            guard let older = older else { return }
+            
+            MastodonController.shared.client.run(Timelines.home(range: older)) { result in
+                guard case let .success(newStatuses, pagination) = result else { fatalError() }
+                self.older = pagination?.next
+                self.statuses.append(contentsOf: newStatuses)
+            }
+        }
     }
-    */
 
-    /*
-    // Override to support editing the table view.
-    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
-        if editingStyle == .delete {
-            // Delete the row from the data source
-            tableView.deleteRows(at: [indexPath], with: .fade)
-        } else if editingStyle == .insert {
-            // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
-        }    
+    @IBAction func refreshStatuses(_ sender: Any) {
+        guard let newer = newer else { return }
+        
+        MastodonController.shared.client.run(Timelines.home(range: newer)) { result in
+            guard case let .success(newStatuses, pagination) = result else { fatalError() }
+            self.newer = pagination?.previous
+            self.statuses.insert(contentsOf: newStatuses, at: 0)
+            DispatchQueue.main.async {
+                self.refreshControl?.endRefreshing()
+                
+                // maintain the current position in the list (don't scroll to the top)
+                self.tableView.scrollToRow(at: IndexPath(row: newStatuses.count, section: 0), at: .top, animated: false)
+            }
+        }
     }
-    */
-
-    /*
-    // Override to support rearranging the table view.
-    override func tableView(_ tableView: UITableView, moveRowAt fromIndexPath: IndexPath, to: IndexPath) {
-
-    }
-    */
-
-    /*
-    // Override to support conditional rearranging of the table view.
-    override func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
-        // Return false if you do not want the item to be re-orderable.
-        return true
-    }
-    */
-
-    /*
-    // MARK: - Navigation
-
-    // In a storyboard-based application, you will often want to do a little preparation before navigation
-    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
-        // Get the new view controller using segue.destination.
-        // Pass the selected object to the new view controller.
-    }
-    */
-
+    
 }