Try out DelegateChooser

requires Qt5.12+

resources/qml/TimelineView.qml

@@ -3,9 +3,12 @@ import QtQuick.Controls 2.1
 import QtQuick.Layouts 1.2
 import QtGraphicalEffects 1.0
 import QtQuick.Window 2.2
+import Qt.labs.qmlmodels 1.0
 
 import com.github.nheko 1.0
 
+import "./delegates"
+
 Rectangle {
 	anchors.fill: parent
 
@@ -77,158 +80,47 @@ Rectangle {
 		onMovementEnded: updatePosition()
 
 		spacing: 4
-		delegate: RowLayout {
-			anchors.leftMargin: avatarSize + 4
-			anchors.left: parent.left
-			anchors.right: parent.right
-			anchors.rightMargin: scrollbar.width
-
-			function isFullyVisible() {
-				return (y - chat.contentY - 1) + height < chat.height
+		delegate: DelegateChooser {
+			role: "type"
+			DelegateChoice {
+				roleValue: MtxEvent.TextMessage
+				TimelineRow { view: chat; TextMessage { id: kid } }
 			}
-			function getIndex() {
-				return index;
+			DelegateChoice {
+				roleValue: MtxEvent.NoticeMessage
+				TimelineRow { view: chat; NoticeMessage { id: kid } }
 			}
-
-			Loader {
-				id: loader
-				Layout.fillWidth: true
-				Layout.alignment: Qt.AlignTop
-				height: item.height
-
-				source: switch(model.type) {
-					//case MtxEvent.Aliases: return "delegates/Aliases.qml"
-					//case MtxEvent.Avatar: return "delegates/Avatar.qml"
-					//case MtxEvent.CanonicalAlias: return "delegates/CanonicalAlias.qml"
-					//case MtxEvent.Create: return "delegates/Create.qml"
-					//case MtxEvent.GuestAccess: return "delegates/GuestAccess.qml"
-					//case MtxEvent.HistoryVisibility: return "delegates/HistoryVisibility.qml"
-					//case MtxEvent.JoinRules: return "delegates/JoinRules.qml"
-					//case MtxEvent.Member: return "delegates/Member.qml"
-					//case MtxEvent.Name: return "delegates/Name.qml"
-					//case MtxEvent.PowerLevels: return "delegates/PowerLevels.qml"
-					//case MtxEvent.Topic: return "delegates/Topic.qml"
-					case MtxEvent.NoticeMessage: return "delegates/NoticeMessage.qml"
-					case MtxEvent.TextMessage: return "delegates/TextMessage.qml"
-					case MtxEvent.EmoteMessage: return "delegates/TextMessage.qml"
-					case MtxEvent.ImageMessage: return "delegates/ImageMessage.qml"
-					case MtxEvent.Sticker: return "delegates/ImageMessage.qml"
-					case MtxEvent.FileMessage: return "delegates/FileMessage.qml"
-					case MtxEvent.VideoMessage: return "delegates/PlayableMediaMessage.qml"
-					case MtxEvent.AudioMessage: return "delegates/PlayableMediaMessage.qml"
-					case MtxEvent.Redacted: return "delegates/Redacted.qml"
-					default: return "delegates/placeholder.qml"
-				}
-				property variant eventData: model
+			DelegateChoice {
+				roleValue: MtxEvent.EmoteMessage
+				TimelineRow { view: chat; TextMessage { id: kid } }
 			}
-
-			StatusIndicator {
-				state: model.state
-				Layout.alignment: Qt.AlignRight | Qt.AlignTop
-				Layout.preferredHeight: 16
+			DelegateChoice {
+				roleValue: MtxEvent.ImageMessage
+				TimelineRow { view: chat; ImageMessage { id: kid } }
 			}
-
-			EncryptionIndicator {
-				visible: model.isEncrypted
-				Layout.alignment: Qt.AlignRight | Qt.AlignTop
-				Layout.preferredHeight: 16
+			DelegateChoice {
+				roleValue: MtxEvent.Sticker
+				TimelineRow { view: chat; ImageMessage { id: kid } }
 			}
-
-			Button {
-				Layout.alignment: Qt.AlignRight | Qt.AlignTop
-				id: replyButton
-				flat: true
-				Layout.preferredHeight: 16
-				ToolTip.visible: hovered
-				ToolTip.text: qsTr("Reply")
-
-				// disable background, because we don't want a border on hover
-				background: Item {
-				}
-
-				Image {
-					id: replyButtonImg
-					// Workaround, can't get icon.source working for now...
-					anchors.fill: parent
-					source: "qrc:/icons/icons/ui/mail-reply.png"
-				}
-				ColorOverlay {
-					anchors.fill: replyButtonImg
-					source: replyButtonImg
-					color: replyButton.hovered ? colors.highlight : colors.buttonText
-				}
-
-				onClicked: chat.model.replyAction(model.id)
+			DelegateChoice {
+				roleValue: MtxEvent.FileMessage
+				TimelineRow { view: chat; FileMessage { id: kid } }
 			}
-			Button {
-				Layout.alignment: Qt.AlignRight | Qt.AlignTop
-				id: optionsButton
-				flat: true
-				Layout.preferredHeight: 16
-				ToolTip.visible: hovered
-				ToolTip.text: qsTr("Options")
-
-				// disable background, because we don't want a border on hover
-				background: Item {
-				}
-
-				Image {
-					id: optionsButtonImg
-					// Workaround, can't get icon.source working for now...
-					anchors.fill: parent
-					source: "qrc:/icons/icons/ui/vertical-ellipsis.png"
-				}
-				ColorOverlay {
-					anchors.fill: optionsButtonImg
-					source: optionsButtonImg
-					color: optionsButton.hovered ? colors.highlight : colors.buttonText
-				}
-
-				onClicked: contextMenu.open()
-
-				Menu {
-					y: optionsButton.height
-					id: contextMenu
-
-					MenuItem {
-						text: qsTr("Read receipts")
-						onTriggered: chat.model.readReceiptsAction(model.id)
-					}
-					MenuItem {
-						text: qsTr("Mark as read")
-					}
-					MenuItem {
-						text: qsTr("View raw message")
-						onTriggered: chat.model.viewRawMessage(model.id)
-					}
-					MenuItem {
-						text: qsTr("Redact message")
-						onTriggered: chat.model.redactEvent(model.id)
-					}
-					MenuItem {
-						visible: model.type == MtxEvent.ImageMessage || model.type == MtxEvent.VideoMessage || model.type == MtxEvent.AudioMessage || model.type == MtxEvent.FileMessage || model.type == MtxEvent.Sticker
-						text: qsTr("Save as")
-						onTriggered: timelineManager.saveMedia(model.url, model.filename, model.mimetype, model.type)
-					}
-				}
+			DelegateChoice {
+				roleValue: MtxEvent.VideoMessage
+				TimelineRow { view: chat; PlayableMediaMessage { id: kid } }
 			}
-
-			Text {
-				Layout.alignment: Qt.AlignRight | Qt.AlignTop
-				text: model.timestamp.toLocaleTimeString("HH:mm")
-				color: inactiveColors.text
-
-				ToolTip.visible: ma.containsMouse
-				ToolTip.text: Qt.formatDateTime(model.timestamp, Qt.DefaultLocaleLongDate)
-
-				MouseArea{
-					id: ma
-					anchors.fill: parent
-					hoverEnabled: true
-				}
+			DelegateChoice {
+				roleValue: MtxEvent.AudioMessage
+				TimelineRow { view: chat; PlayableMediaMessage { id: kid } }
+			}
+			DelegateChoice {
+				roleValue: MtxEvent.Redacted
+				TimelineRow { view: chat; Redacted { id: kid } }
 			}
 		}
 
+
 		section {
 			property: "section"
 			delegate: Column {

resources/qml/delegates/FileMessage.qml

@@ -31,7 +31,7 @@ Rectangle {
 			}
 			MouseArea {
 				anchors.fill: parent
-				onClicked: timelineManager.saveMedia(eventData.url, eventData.filename, eventData.mimetype, eventData.type)
+				onClicked: timelineManager.saveMedia(model.url, model.filename, model.mimetype, model.type)
 				cursorShape: Qt.PointingHandCursor
 			}
 		}
@@ -40,14 +40,14 @@ Rectangle {
 
 			Text {
 				Layout.fillWidth: true
-				text: eventData.body
+				text: model.body
 				textFormat: Text.PlainText
 				elide: Text.ElideRight
 				color: colors.text
 			}
 			Text {
 				Layout.fillWidth: true
-				text: eventData.filesize
+				text: model.filesize
 				textFormat: Text.PlainText
 				elide: Text.ElideRight
 				color: colors.text

resources/qml/delegates/ImageMessage.qml

@@ -4,20 +4,20 @@ import com.github.nheko 1.0
 
 Item {
 	width: 300
-	height: 300 * eventData.proportionalHeight
+	height: 300 * model.proportionalHeight
 
 	Image {
 		id: img
 		anchors.fill: parent
 
-		source: eventData.url.replace("mxc://", "image://MxcImage/")
+		source: model.url.replace("mxc://", "image://MxcImage/")
 		asynchronous: true
 		fillMode: Image.PreserveAspectFit
 
 		MouseArea {
-			enabled: eventData.type == MtxEvent.ImageMessage
+			enabled: model.type == MtxEvent.ImageMessage
 			anchors.fill: parent
-			onClicked: timelineManager.openImageOverlay(eventData.url, eventData.filename, eventData.mimetype, eventData.type)
+			onClicked: timelineManager.openImageOverlay(model.url, model.filename, model.mimetype, model.type)
 		}
 	}
 }

resources/qml/delegates/NoticeMessage.qml

@@ -1,7 +1,7 @@
 import QtQuick 2.5
 
 TextEdit {
-	text: eventData.formattedBody
+	text: model.formattedBody
 	textFormat: TextEdit.RichText
 	readOnly: true
 	wrapMode: Text.Wrap

resources/qml/delegates/PlayableMediaMessage.qml

@@ -17,7 +17,7 @@ Rectangle {
 		anchors.centerIn: parent
 
 		VideoOutput {
-			visible: eventData.type == MtxEvent.VideoMessage
+			visible: model.type == MtxEvent.VideoMessage
 			Layout.maximumHeight: 300
 			Layout.minimumHeight: 300
 			Layout.maximumWidth: 500
@@ -85,7 +85,7 @@ Rectangle {
 					anchors.fill: parent
 					onClicked: {
 						switch (button.state) {
-							case "": timelineManager.cacheMedia(eventData.url, eventData.mimetype); break;
+							case "": timelineManager.cacheMedia(model.url, model.mimetype); break;
 							case "stopped":
 							media.play(); console.log("play");
 							button.state = "playing"
@@ -107,7 +107,7 @@ Rectangle {
 				Connections {
 					target: timelineManager
 					onMediaCached: {
-						if (mxcUrl == eventData.url) {
+						if (mxcUrl == model.url) {
 							media.source = "file://" + cacheUrl
 							button.state = "stopped"
 							console.log("media loaded: " + mxcUrl + " at " + cacheUrl)
@@ -132,14 +132,14 @@ Rectangle {
 
 				Text {
 					Layout.fillWidth: true
-					text: eventData.body
+					text: model.body
 					textFormat: Text.PlainText
 					elide: Text.ElideRight
 					color: colors.text
 				}
 				Text {
 					Layout.fillWidth: true
-					text: eventData.filesize
+					text: model.filesize
 					textFormat: Text.PlainText
 					elide: Text.ElideRight
 					color: colors.text

resources/qml/delegates/TextMessage.qml

@@ -1,7 +1,7 @@
 import QtQuick 2.5
 
 TextEdit {
-	text: eventData.formattedBody
+	text: model.formattedBody
 	textFormat: TextEdit.RichText
 	readOnly: true
 	wrapMode: Text.Wrap

resources/qml/delegates/TimelineRow.qml

@@ -0,0 +1,139 @@
+import QtQuick 2.6
+import QtQuick.Controls 2.1
+import QtQuick.Layouts 1.2
+import QtGraphicalEffects 1.0
+import QtQuick.Window 2.2
+
+import com.github.nheko 1.0
+
+import ".."
+
+RowLayout {
+	property var view: undefined
+	default property alias data: contentItem.data
+
+	height: kid.height // TODO: fix this, we shouldn't need to give the child of contentItem this id!
+	anchors.leftMargin: avatarSize + 4
+	anchors.left: parent.left
+	anchors.right: parent.right
+	anchors.rightMargin: scrollbar.width
+
+	function isFullyVisible() {
+		return (y - view.contentY - 1) + height < view.height
+	}
+	function getIndex() {
+		return index;
+	}
+
+	Item {
+		id: contentItem
+		Layout.fillWidth: true
+		Layout.alignment: Qt.AlignTop
+	}
+
+	StatusIndicator {
+		state: model.state
+		Layout.alignment: Qt.AlignRight | Qt.AlignTop
+		Layout.preferredHeight: 16
+	}
+
+	EncryptionIndicator {
+		visible: model.isEncrypted
+		Layout.alignment: Qt.AlignRight | Qt.AlignTop
+		Layout.preferredHeight: 16
+	}
+
+	Button {
+		Layout.alignment: Qt.AlignRight | Qt.AlignTop
+		id: replyButton
+		flat: true
+		Layout.preferredHeight: 16
+		ToolTip.visible: hovered
+		ToolTip.text: qsTr("Reply")
+
+		// disable background, because we don't want a border on hover
+		background: Item {
+		}
+
+		Image {
+			id: replyButtonImg
+			// Workaround, can't get icon.source working for now...
+			anchors.fill: parent
+			source: "qrc:/icons/icons/ui/mail-reply.png"
+		}
+		ColorOverlay {
+			anchors.fill: replyButtonImg
+			source: replyButtonImg
+			color: replyButton.hovered ? colors.highlight : colors.buttonText
+		}
+
+		onClicked: view.model.replyAction(model.id)
+	}
+	Button {
+		Layout.alignment: Qt.AlignRight | Qt.AlignTop
+		id: optionsButton
+		flat: true
+		Layout.preferredHeight: 16
+		ToolTip.visible: hovered
+		ToolTip.text: qsTr("Options")
+
+		// disable background, because we don't want a border on hover
+		background: Item {
+		}
+
+		Image {
+			id: optionsButtonImg
+			// Workaround, can't get icon.source working for now...
+			anchors.fill: parent
+			source: "qrc:/icons/icons/ui/vertical-ellipsis.png"
+		}
+		ColorOverlay {
+			anchors.fill: optionsButtonImg
+			source: optionsButtonImg
+			color: optionsButton.hovered ? colors.highlight : colors.buttonText
+		}
+
+		onClicked: contextMenu.open()
+
+		Menu {
+			y: optionsButton.height
+			id: contextMenu
+
+			MenuItem {
+				text: qsTr("Read receipts")
+				onTriggered: view.model.readReceiptsAction(model.id)
+			}
+			MenuItem {
+				text: qsTr("Mark as read")
+			}
+			MenuItem {
+				text: qsTr("View raw message")
+				onTriggered: view.model.viewRawMessage(model.id)
+			}
+			MenuItem {
+				text: qsTr("Redact message")
+				onTriggered: view.model.redactEvent(model.id)
+			}
+			MenuItem {
+				visible: model.type == MtxEvent.ImageMessage || model.type == MtxEvent.VideoMessage || model.type == MtxEvent.AudioMessage || model.type == MtxEvent.FileMessage || model.type == MtxEvent.Sticker
+				text: qsTr("Save as")
+				onTriggered: timelineManager.saveMedia(model.url, model.filename, model.mimetype, model.type)
+			}
+		}
+	}
+
+	Text {
+		Layout.alignment: Qt.AlignRight | Qt.AlignTop
+		text: model.timestamp.toLocaleTimeString("HH:mm")
+		color: inactiveColors.text
+
+		ToolTip.visible: ma.containsMouse
+		ToolTip.text: Qt.formatDateTime(model.timestamp, Qt.DefaultLocaleLongDate)
+
+		MouseArea{
+			id: ma
+			anchors.fill: parent
+			hoverEnabled: true
+		}
+	}
+}

resources/qml/delegates/placeholder.qml

@@ -2,7 +2,7 @@ import QtQuick 2.5
 import QtQuick.Controls 2.1
 
 Label {
-	text: qsTr("unimplemented event: ") + eventData.type
+	text: qsTr("unimplemented event: ") + model.type
 	textFormat: Text.PlainText
 	wrapMode: Text.Wrap
 	width: parent.width

resources/res.qrc

@@ -119,6 +119,7 @@
         <file>qml/Avatar.qml</file>
         <file>qml/StatusIndicator.qml</file>
         <file>qml/EncryptionIndicator.qml</file>
+        <file>qml/delegates/TimelineRow.qml</file>
         <file>qml/delegates/TextMessage.qml</file>
         <file>qml/delegates/NoticeMessage.qml</file>
         <file>qml/delegates/ImageMessage.qml</file>