Somewhat better hierarchy.

Init separate .qml files.

imports/Spectral/Component/AutoTextArea.qml

@@ -0,0 +1,113 @@
+import QtQuick 2.9
+import QtQuick.Controls 2.2
+
+TextArea {
+    property real progress: 0
+
+    wrapMode: Text.Wrap
+    placeholderText: "Send a Message"
+    leftPadding: 16
+    topPadding: 0
+    bottomPadding: 0
+    selectByMouse: true
+    verticalAlignment: TextEdit.AlignVCenter
+
+    text: currentRoom ? currentRoom.cachedInput : ""
+
+    background: Item {
+    }
+
+    Timer {
+        id: timeoutTimer
+
+        repeat: false
+        interval: 2000
+        onTriggered: {
+            repeatTimer.stop()
+            currentRoom.sendTypingNotification(false)
+        }
+    }
+
+    Timer {
+        id: repeatTimer
+
+        repeat: true
+        interval: 5000
+        triggeredOnStart: true
+        onTriggered: currentRoom.sendTypingNotification(true)
+    }
+
+    ToolTip.visible: currentRoom
+                     && currentRoom.hasUsersTyping
+    ToolTip.text: currentRoom ? currentRoom.usersTyping : ""
+
+    Keys.onReturnPressed: {
+        if (event.modifiers & Qt.ShiftModifier) {
+            insert(cursorPosition, "\n")
+        } else {
+            postMessage(text)
+            text = ""
+        }
+    }
+
+    onTextChanged: {
+        timeoutTimer.restart()
+        repeatTimer.start()
+        currentRoom.cachedInput = text
+    }
+
+    function postMessage(text) {
+        if (text.trim().length === 0) { return }
+        if(!currentRoom) { return }
+
+        var PREFIX_ME = '/me '
+        var PREFIX_NOTICE = '/notice '
+        var PREFIX_RAINBOW = '/rainbow '
+        var PREFIX_HTML = '/html '
+        var PREFIX_MARKDOWN = '/md '
+
+        var replyRe = new RegExp("^> <(.*)><(.*)> (.*)\n\n(.*)")
+        if (text.match(replyRe)) {
+            var matches = text.match(replyRe)
+            currentRoom.sendReply(matches[1], matches[2], matches[3], matches[4])
+            return
+        }
+
+        if (text.indexOf(PREFIX_ME) === 0) {
+            text = text.substr(PREFIX_ME.length)
+            currentRoom.postMessage(text, RoomMessageEvent.Emote)
+            return
+        }
+        if (text.indexOf(PREFIX_NOTICE) === 0) {
+            text = text.substr(PREFIX_NOTICE.length)
+            currentRoom.postMessage(text, RoomMessageEvent.Notice)
+            return
+        }
+        if (text.indexOf(PREFIX_RAINBOW) === 0) {
+            text = text.substr(PREFIX_RAINBOW.length)
+
+            var parsedText = ""
+            var rainbowColor = ["#ff2b00", "#ff5500", "#ff8000", "#ffaa00", "#ffd500", "#ffff00", "#d4ff00", "#aaff00", "#80ff00", "#55ff00", "#2bff00", "#00ff00", "#00ff2b", "#00ff55", "#00ff80", "#00ffaa", "#00ffd5", "#00ffff", "#00d4ff", "#00aaff", "#007fff", "#0055ff", "#002bff", "#0000ff", "#2a00ff", "#5500ff", "#7f00ff", "#aa00ff", "#d400ff", "#ff00ff", "#ff00d4", "#ff00aa", "#ff0080", "#ff0055", "#ff002b", "#ff0000"]
+            for (var i = 0; i < text.length; i++) {
+                parsedText = parsedText + "<font color='" + rainbowColor[i % rainbowColor.length] + "'>" + text.charAt(i) + "</font>"
+            }
+            currentRoom.postHtmlMessage(text, parsedText, RoomMessageEvent.Text)
+            return
+        }
+        if (text.indexOf(PREFIX_HTML) === 0) {
+            text = text.substr(PREFIX_HTML.length)
+            var re = new RegExp("<.*?>")
+            var plainText = text.replace(re, "")
+            currentRoom.postHtmlMessage(plainText, text, RoomMessageEvent.Text)
+            return
+        }
+        if (text.indexOf(PREFIX_MARKDOWN) === 0) {
+            text = text.substr(PREFIX_MARKDOWN.length)
+            var parsedText = Markdown.markdown_parser(text)
+            currentRoom.postHtmlMessage(text, parsedText, RoomMessageEvent.Text)
+            return
+        }
+
+        currentRoom.postPlainText(text)
+    }
+}

imports/Spectral/Component/Timeline/MessageDelegate.qml

@@ -6,6 +6,8 @@ import QtQuick.Controls.Material 2.2
 import Spectral 0.1
 import Spectral.Setting 0.1
 
+import Spectral.Component 2.0
+
 import "qrc:/js/util.js" as Util
 
 RowLayout {

imports/Spectral/Component/qmldir

@@ -2,3 +2,6 @@ module Spectral.Component
 AutoMouseArea 2.0 AutoMouseArea.qml
 MaterialIcon 2.0 MaterialIcon.qml
 SideNavButton 2.0 SideNavButton.qml
+AutoImage 2.0 AutoImage.qml
+AutoLabel 2.0 AutoLabel.qml
+AutoTextArea 2.0 AutoTextArea.qml