From f201ea59c9fae2cb79fddc2351bc1829d6f7545e Mon Sep 17 00:00:00 2001
From: ismailgulek <ismailgulek@users.noreply.github.com>
Date: Tue, 20 Sep 2022 11:40:32 +0300
Subject: [PATCH] Timeline composer layout loop fix (#6743)

* Publish suitable view height for user suggestions

* Update container view height

* Add changelog

* Fix user suggestions layout for pre iOS 16
---
 Riot/Modules/Room/RoomViewController.h        |  1 +
 Riot/Modules/Room/RoomViewController.m        | 10 +++++
 Riot/Modules/Room/RoomViewController.xib      |  3 +-
 .../UserSuggestionCoordinator.swift           | 41 ++++++++++++++++++-
 .../UserSuggestionCoordinatorBridge.swift     |  5 +++
 changelog.d/6734.bugfix                       |  1 +
 6 files changed, 58 insertions(+), 3 deletions(-)
 create mode 100644 changelog.d/6734.bugfix

diff --git a/Riot/Modules/Room/RoomViewController.h b/Riot/Modules/Room/RoomViewController.h
index 2b0ad02c5..a01f6c567 100644
--- a/Riot/Modules/Room/RoomViewController.h
+++ b/Riot/Modules/Room/RoomViewController.h
@@ -55,6 +55,7 @@ extern NSNotificationName const RoomGroupCallTileTappedNotification;
 // The preview header
 @property (weak, nonatomic, nullable) IBOutlet UIView *previewHeaderContainer;
 @property (weak, nonatomic, nullable) IBOutlet NSLayoutConstraint *previewHeaderContainerHeightConstraint;
+@property (weak, nonatomic, nullable) IBOutlet NSLayoutConstraint *userSuggestionContainerHeightConstraint;
 
 // The jump to last unread banner
 @property (weak, nonatomic, nullable) IBOutlet UIView *jumpToLastUnreadBannerContainer;
diff --git a/Riot/Modules/Room/RoomViewController.m b/Riot/Modules/Room/RoomViewController.m
index cb0fb1a31..542007a41 100644
--- a/Riot/Modules/Room/RoomViewController.m
+++ b/Riot/Modules/Room/RoomViewController.m
@@ -7757,6 +7757,16 @@ static CGSize kThreadListBarButtonItemImageSize;
     [self mention:member];
 }
 
+- (void)userSuggestionCoordinatorBridge:(UserSuggestionCoordinatorBridge *)coordinator didUpdateViewHeight:(CGFloat)height
+{
+    if (self.userSuggestionContainerHeightConstraint.constant != height)
+    {
+        self.userSuggestionContainerHeightConstraint.constant = height;
+
+        [self.view layoutIfNeeded];
+    }
+}
+
 #pragma mark - ThreadsCoordinatorBridgePresenterDelegate
 
 - (void)threadsCoordinatorBridgePresenterDelegateDidComplete:(ThreadsCoordinatorBridgePresenter *)coordinatorBridgePresenter
diff --git a/Riot/Modules/Room/RoomViewController.xib b/Riot/Modules/Room/RoomViewController.xib
index 888aa3b75..073276604 100644
--- a/Riot/Modules/Room/RoomViewController.xib
+++ b/Riot/Modules/Room/RoomViewController.xib
@@ -32,6 +32,7 @@
                 <outlet property="scrollToBottomBadgeLabel" destination="QHs-rM-UU8" id="wk7-PQ-9Jm"/>
                 <outlet property="scrollToBottomButton" destination="Ih9-EU-BOU" id="Wwg-gS-Sfp"/>
                 <outlet property="topBannersStackView" destination="3z2-8P-wlg" id="uf5-gw-zWi"/>
+                <outlet property="userSuggestionContainerHeightConstraint" destination="1Cd-cT-gOr" id="au5-3q-r54"/>
                 <outlet property="userSuggestionContainerView" destination="oni-F4-X1U" id="0js-Ji-8Mm"/>
                 <outlet property="view" destination="iN0-l3-epB" id="ieV-u7-rXU"/>
             </connections>
@@ -171,7 +172,7 @@
                     <rect key="frame" x="0.0" y="626" width="375" height="0.0"/>
                     <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                     <constraints>
-                        <constraint firstAttribute="height" placeholder="YES" id="1Cd-cT-gOr"/>
+                        <constraint firstAttribute="height" id="1Cd-cT-gOr"/>
                     </constraints>
                 </view>
                 <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="nLd-BP-JAE" userLabel="Room Input Toolbar Container">
diff --git a/RiotSwiftUI/Modules/Room/UserSuggestion/Coordinator/UserSuggestionCoordinator.swift b/RiotSwiftUI/Modules/Room/UserSuggestion/Coordinator/UserSuggestionCoordinator.swift
index 4d10fce83..fd7bd57b3 100644
--- a/RiotSwiftUI/Modules/Room/UserSuggestion/Coordinator/UserSuggestionCoordinator.swift
+++ b/RiotSwiftUI/Modules/Room/UserSuggestion/Coordinator/UserSuggestionCoordinator.swift
@@ -17,9 +17,11 @@
 import Foundation
 import UIKit
 import SwiftUI
+import Combine
 
 protocol UserSuggestionCoordinatorDelegate: AnyObject {
     func userSuggestionCoordinator(_ coordinator: UserSuggestionCoordinator, didRequestMentionForMember member: MXRoomMember, textTrigger: String?)
+    func userSuggestionCoordinator(_ coordinator: UserSuggestionCoordinator, didUpdateViewHeight height: CGFloat)
 }
 
 struct UserSuggestionCoordinatorParameters {
@@ -35,10 +37,12 @@ final class UserSuggestionCoordinator: Coordinator, Presentable {
     
     private let parameters: UserSuggestionCoordinatorParameters
     
-    private var userSuggestionHostingController: UIViewController
+    private var userSuggestionHostingController: UIHostingController<AnyView>
     private var userSuggestionService: UserSuggestionServiceProtocol
     private var userSuggestionViewModel: UserSuggestionViewModelProtocol
     private var roomMemberProvider: UserSuggestionCoordinatorRoomMemberProvider
+
+    private var cancellables = Set<AnyCancellable>()
     
     // MARK: Public
 
@@ -77,12 +81,18 @@ final class UserSuggestionCoordinator: Coordinator, Presentable {
                 self.delegate?.userSuggestionCoordinator(self, didRequestMentionForMember: member, textTrigger: self.userSuggestionService.currentTextTrigger)
             }
         }
+
+        userSuggestionService.items.sink { [weak self] _ in
+            guard let self = self else { return }
+            self.delegate?.userSuggestionCoordinator(self,
+                                                     didUpdateViewHeight: self.calculateViewHeight())
+        }.store(in: &cancellables)
     }
     
     func processTextMessage(_ textMessage: String) {
         userSuggestionService.processTextMessage(textMessage)
     }
-    
+
     // MARK: - Public
     func start() {
         
@@ -91,6 +101,33 @@ final class UserSuggestionCoordinator: Coordinator, Presentable {
     func toPresentable() -> UIViewController {
         return self.userSuggestionHostingController
     }
+
+    // MARK: - Private
+
+    private func calculateViewHeight() -> CGFloat {
+        let viewModel = UserSuggestionViewModel(userSuggestionService: userSuggestionService)
+        let view = UserSuggestionList(viewModel: viewModel.context)
+            .addDependency(AvatarService.instantiate(mediaManager: parameters.mediaManager))
+
+        let controller = VectorHostingController(rootView: view)
+        guard let view = controller.view else {
+            return 0
+        }
+        view.isHidden = true
+
+        toPresentable().view.addSubview(view)
+        controller.didMove(toParent: toPresentable())
+
+        view.setNeedsLayout()
+        view.layoutIfNeeded()
+
+        let result = view.intrinsicContentSize.height
+
+        controller.didMove(toParent: nil)
+        view.removeFromSuperview()
+
+        return result
+    }
 }
 
 private class UserSuggestionCoordinatorRoomMemberProvider: RoomMembersProviderProtocol {
diff --git a/RiotSwiftUI/Modules/Room/UserSuggestion/Coordinator/UserSuggestionCoordinatorBridge.swift b/RiotSwiftUI/Modules/Room/UserSuggestion/Coordinator/UserSuggestionCoordinatorBridge.swift
index 1fd88e25b..44ddaee9f 100644
--- a/RiotSwiftUI/Modules/Room/UserSuggestion/Coordinator/UserSuggestionCoordinatorBridge.swift
+++ b/RiotSwiftUI/Modules/Room/UserSuggestion/Coordinator/UserSuggestionCoordinatorBridge.swift
@@ -19,6 +19,7 @@ import Foundation
 @objc
 protocol UserSuggestionCoordinatorBridgeDelegate: AnyObject {
     func userSuggestionCoordinatorBridge(_ coordinator: UserSuggestionCoordinatorBridge, didRequestMentionForMember member: MXRoomMember, textTrigger: String?)
+    func userSuggestionCoordinatorBridge(_ coordinator: UserSuggestionCoordinatorBridge, didUpdateViewHeight height: CGFloat)
 }
 
 @objcMembers
@@ -54,4 +55,8 @@ extension UserSuggestionCoordinatorBridge: UserSuggestionCoordinatorDelegate {
     func userSuggestionCoordinator(_ coordinator: UserSuggestionCoordinator, didRequestMentionForMember member: MXRoomMember, textTrigger: String?) {
         delegate?.userSuggestionCoordinatorBridge(self, didRequestMentionForMember: member, textTrigger: textTrigger)
     }
+
+    func userSuggestionCoordinator(_ coordinator: UserSuggestionCoordinator, didUpdateViewHeight height: CGFloat) {
+        delegate?.userSuggestionCoordinatorBridge(self, didUpdateViewHeight: height)
+    }
 }
diff --git a/changelog.d/6734.bugfix b/changelog.d/6734.bugfix
new file mode 100644
index 000000000..feec00f69
--- /dev/null
+++ b/changelog.d/6734.bugfix
@@ -0,0 +1 @@
+Room: Fix a composer crash after long unsent messages.