Fix audio playback

Since the preparation for encrypted events landed, audio playback was broken since QtMultimedia (gstreamer)
doesn't use our custom QNAM. Instead of letting QtMultimedia download the media, we thus need to manually download it
and point QML Audio to the local file. On the positive side, this also allows encrypted Audio files to be played and enables us to seek in the audio delegate :)
It does however mean that we do need to do an annoying bit of manual state management.

BUG: 457687

imports/NeoChat/Component/Timeline/AudioDelegate.qml

@@ -1,18 +1,14 @@
-// SPDX-FileCopyrightText: 2019-2020 Black Hat <bhat@encom.eu.org>
-// SPDX-License-Identifier: GPL-3.0-only
+// SPDX-FileCopyrightText: 2022 Tobias Fella <fella@posteo.de>
+// SPDX-License-Identifier: GPL-2.0-or-later
 
 import QtQuick 2.15
 import QtQuick.Controls 2.15
 import QtQuick.Layouts 1.15
-import Qt.labs.platform 1.1 as Platform
 import QtMultimedia 5.15
 
 import org.kde.kirigami 2.15 as Kirigami
 
 import org.kde.neochat 1.0
-import NeoChat.Component 1.0
-import NeoChat.Dialog 1.0
-import NeoChat.Menu.Timeline 1.0
 
 TimelineContainer {
     id: audioDelegate
@@ -21,6 +17,9 @@ TimelineContainer {
 
     onOpenContextMenu: openFileContext(model, audioDelegate)
 
+    readonly property bool downloaded: model.progressInfo && model.progressInfo.completed
+    onDownloadedChanged: audio.play()
+
     hoverComponent: hoverActions
     innerObject: Control {
         Layout.fillWidth: true
@@ -28,36 +27,90 @@ TimelineContainer {
 
         Audio {
             id: audio
-            source: currentRoom.urlToMxcUrl(content.url)
+            source: model.progressInfo.localPath
             autoLoad: false
         }
 
+        states: [
+            State {
+                name: "notDownloaded"
+                when: !model.progressInfo.completed && !model.progressInfo.active
+
+                PropertyChanges {
+                    target: playButton
+                    icon.name: "media-playback-start"
+                    onClicked: currentRoom.downloadFile(model.eventId)
+                }
+            },
+            State {
+                name: "downloading"
+                when: model.progressInfo.active && !model.progressInfo.completed
+                PropertyChanges {
+                    target: downloadBar
+                    visible: true
+                }
+                PropertyChanges {
+                    target: playButton
+                    icon.name: "media-playback-stop"
+                    onClicked: {
+                        currentRoom.cancelFileTransfer(model.eventId)
+                    }
+                }
+            },
+            State {
+                name: "paused"
+                when: model.progressInfo.completed && (audio.playbackState === Audio.StoppedState || audio.playbackState === Audio.PausedState)
+                PropertyChanges {
+                    target: playButton
+                    icon.name: "media-playback-start"
+                    onClicked: {
+                        audio.play()
+                    }
+                }
+            },
+            State {
+                name: "playing"
+                when: model.progressInfo.completed && audio.playbackState === Audio.PlayingState
+
+                PropertyChanges {
+                    target: playButton
+
+                    icon.name: "media-playback-pause"
+
+                    onClicked: audio.pause()
+                }
+            }
+        ]
+
         contentItem: ColumnLayout {
             RowLayout {
                 ToolButton {
-                    icon.name: audio.playbackState == Audio.PlayingState ? "media-playback-pause" : "media-playback-start"
-
-                    onClicked: {
-                        if (audio.playbackState == Audio.PlayingState) {
-                            audio.pause()
-                        } else {
-                            audio.play()
-                        }
-                    }
+                    id: playButton
                 }
                 Label {
                     text: model.display
+                    wrapMode: Text.Wrap
+                    Layout.fillWidth: true
                 }
             }
+            ProgressBar {
+                id: downloadBar
+                visible: false
+                Layout.fillWidth: true
+                from: 0
+                to: model.content.info.size
+                value: model.progressInfo.progress
+            }
             RowLayout {
                 visible: audio.hasAudio
                 Layout.leftMargin: Kirigami.Units.largeSpacing
                 Layout.rightMargin: Kirigami.Units.largeSpacing
-                // Server doesn't support seeking, so use ProgressBar instead of Slider :(
-                ProgressBar {
+
+                Slider {
                     from: 0
                     to: audio.duration
                     value: audio.position
+                    onMoved: audio.seek(value)
                 }
 
                 Label {

src/messageeventmodel.cpp

@@ -193,6 +193,7 @@ void MessageEventModel::setRoom(NeoChatRoom *room)
             }
             refreshEventRoles(eventId, {ReactionRole, Qt::DisplayRole});
         });
+        connect(m_currentRoom, &Room::newFileTransfer, this, &MessageEventModel::refreshEvent);
         connect(m_currentRoom, &Room::fileTransferProgress, this, &MessageEventModel::refreshEvent);
         connect(m_currentRoom, &Room::fileTransferCompleted, this, &MessageEventModel::refreshEvent);
         connect(m_currentRoom, &Room::fileTransferFailed, this, &MessageEventModel::refreshEvent);