Use modules.

imports/Spectral/Component/Timeline/GenericBubble.qml

@@ -0,0 +1,37 @@
+import QtQuick 2.9
+import QtQuick.Controls 2.2
+import QtQuick.Controls.Material 2.2
+
+import Spectral.Component 2.0
+import Spectral.Effect 2.0
+
+import Spectral.Setting 0.1
+
+Control {
+    property bool highlighted: false
+    property bool colored: false
+
+    readonly property bool darkBackground: highlighted  ? true : MSettings.darkTheme
+
+    padding: 12
+
+    AutoMouseArea {
+        anchors.fill: parent
+
+        onSecondaryClicked: {
+            messageContextMenu.row = messageRow
+            messageContextMenu.model = model
+            messageContextMenu.selectedText = contentLabel.selectedText
+            messageContextMenu.popup()
+        }
+    }
+
+    background: Rectangle {
+        color: colored ? Material.accent : highlighted ? Material.primary : Material.background
+
+        layer.enabled: true
+        layer.effect: ElevationEffect {
+            elevation: 2
+        }
+    }
+}