Move TagRoomList stuff into new file and split RoomList.Draw()

2 files changed, 392 insertions, 374 deletions

diff --git a/ui/room-list.go b/ui/room-list.go
index 75d874f..5c40c44 100644
--- a/ui/room-list.go
+++ b/ui/room-list.go
@@ -17,210 +17,23 @@
 package ui
 
 import (
-	"fmt"
 	"regexp"
-	"strconv"
 	"strings"
 
 	"math"
 	"maunium.net/go/gomuks/debug"
 	"maunium.net/go/gomuks/matrix/rooms"
-	"maunium.net/go/gomuks/ui/widget"
 	"maunium.net/go/tcell"
 	"maunium.net/go/tview"
 )
 
-type orderedRoom struct {
-	*rooms.Room
-	order string
-}
-
-func newOrderedRoom(order string, room *rooms.Room) *orderedRoom {
-	return &orderedRoom{
-		Room:  room,
-		order: order,
-	}
-}
-
-func convertRoom(room *rooms.Room) *orderedRoom {
-	return newOrderedRoom("0.5", room)
-}
-
-type tagRoomList struct {
-	rooms    []*orderedRoom
-	maxShown int
-}
-
-func newTagRoomList(rooms ...*orderedRoom) *tagRoomList {
-	return &tagRoomList{
-		maxShown: 10,
-		rooms:    rooms,
-	}
-}
-
-func (trl *tagRoomList) Visible() []*orderedRoom {
-	return trl.rooms[len(trl.rooms)-trl.Length():]
-}
-
-func (trl *tagRoomList) FirstVisible() *rooms.Room {
-	visible := trl.Visible()
-	if len(visible) > 0 {
-		return visible[len(visible)-1].Room
-	}
-	return nil
-}
-
-func (trl *tagRoomList) LastVisible() *rooms.Room {
-	visible := trl.Visible()
-	if len(visible) > 0 {
-		return visible[0].Room
-	}
-	return nil
-}
-
-func (trl *tagRoomList) All() []*orderedRoom {
-	return trl.rooms
-}
-
-func (trl *tagRoomList) Length() int {
-	if len(trl.rooms) < trl.maxShown {
-		return len(trl.rooms)
-	}
-	return trl.maxShown
-}
-
-func (trl *tagRoomList) TotalLength() int {
-	return len(trl.rooms)
-}
-
-func (trl *tagRoomList) IsEmpty() bool {
-	return len(trl.rooms) == 0
-}
-
-func (trl *tagRoomList) IsCollapsed() bool {
-	return trl.maxShown == 0
-}
-
-func (trl *tagRoomList) ToggleCollapse() {
-	if trl.IsCollapsed() {
-		trl.maxShown = 10
-	} else {
-		trl.maxShown = 0
-	}
-}
-
-func (trl *tagRoomList) HasInvisibleRooms() bool {
-	return trl.maxShown < trl.TotalLength()
-}
-
-func (trl *tagRoomList) HasVisibleRooms() bool {
-	return !trl.IsEmpty() && trl.maxShown > 0
-}
-
-// ShouldBeBefore returns if the first room should be after the second room in the room list.
-// The manual order and last received message timestamp are considered.
-func (trl *tagRoomList) ShouldBeAfter(room1 *orderedRoom, room2 *orderedRoom) bool {
-	orderComp := strings.Compare(room1.order, room2.order)
-	return orderComp == 1 || (orderComp == 0 && room2.LastReceivedMessage.After(room1.LastReceivedMessage))
-}
-
-func (trl *tagRoomList) Insert(order string, mxRoom *rooms.Room) {
-	room := newOrderedRoom(order, mxRoom)
-	trl.rooms = append(trl.rooms, nil)
-	// The default insert index is the newly added slot.
-	// That index will be used if all other rooms in the list have the same LastReceivedMessage timestamp.
-	insertAt := len(trl.rooms) - 1
-	// Find the spot where the new room should be put according to the last received message timestamps.
-	for i := 0; i < len(trl.rooms)-1; i++ {
-		if trl.ShouldBeAfter(room, trl.rooms[i]) {
-			insertAt = i
-			break
-		}
-	}
-	// Move newer rooms forward in the array.
-	for i := len(trl.rooms) - 1; i > insertAt; i-- {
-		trl.rooms[i] = trl.rooms[i-1]
-	}
-	// Insert room.
-	trl.rooms[insertAt] = room
-}
-
-func (trl *tagRoomList) String() string {
-	var str strings.Builder
-	fmt.Fprintln(&str, "&tagRoomList{")
-	fmt.Fprintf(&str, "    maxShown: %d,\n", trl.maxShown)
-	fmt.Fprint(&str, "    rooms: {")
-	for i, room := range trl.rooms {
-		if room == nil {
-			fmt.Fprintf(&str, "<<NIL>>")
-		} else {
-			fmt.Fprint(&str, room.ID)
-		}
-		if i != len(trl.rooms)-1 {
-			fmt.Fprint(&str, ", ")
-		}
-	}
-	fmt.Fprintln(&str, "},")
-	fmt.Fprintln(&str, "}")
-	return str.String()
-}
-
-func (trl *tagRoomList) Bump(mxRoom *rooms.Room) {
-	var found *orderedRoom
-	for i := 0; i < len(trl.rooms); i++ {
-		currentRoom := trl.rooms[i]
-		if found != nil {
-			if trl.ShouldBeAfter(found, trl.rooms[i]) {
-				// This room should be after the room being bumped, so insert the
-				// room being bumped here and return
-				trl.rooms[i-1] = found
-				return
-			}
-			// Move older rooms back in the array
-			trl.rooms[i-1] = currentRoom
-		} else if currentRoom.Room == mxRoom {
-			found = currentRoom
-		}
-	}
-	// If the room being bumped should be first in the list, it won't be inserted during the loop.
-	trl.rooms[len(trl.rooms)-1] = found
-}
-
-func (trl *tagRoomList) Remove(room *rooms.Room) {
-	trl.RemoveIndex(trl.Index(room))
-}
-
-func (trl *tagRoomList) RemoveIndex(index int) {
-	if index < 0 || index > len(trl.rooms) {
-		return
-	}
-	trl.rooms = append(trl.rooms[0:index], trl.rooms[index+1:]...)
-}
-
-func (trl *tagRoomList) Index(room *rooms.Room) int {
-	return trl.indexInList(trl.All(), room)
-}
-
-func (trl *tagRoomList) IndexVisible(room *rooms.Room) int {
-	return trl.indexInList(trl.Visible(), room)
-}
-
-func (trl *tagRoomList) indexInList(list []*orderedRoom, room *rooms.Room) int {
-	for index, entry := range list {
-		if entry.Room == room {
-			return index
-		}
-	}
-	return -1
-}
-
 type RoomList struct {
 	*tview.Box
 
 	// The list of tags in display order.
 	tags []string
 	// The list of rooms, in reverse order.
-	items map[string]*tagRoomList
+	items map[string]*TagRoomList
 	// The selected room.
 	selected    *rooms.Room
 	selectedTag string
@@ -238,7 +51,7 @@ type RoomList struct {
 func NewRoomList() *RoomList {
 	list := &RoomList{
 		Box:   tview.NewBox(),
-		items: make(map[string]*tagRoomList),
+		items: make(map[string]*TagRoomList),
 		tags:  []string{"m.favourite", "net.maunium.gomuks.fake.direct", "", "m.lowpriority"},
 
 		scrollOffset: 0,
@@ -248,14 +61,14 @@ func NewRoomList() *RoomList {
 		selectedBackgroundColor: tcell.ColorDarkGreen,
 	}
 	for _, tag := range list.tags {
-		list.items[tag] = newTagRoomList()
+		list.items[tag] = NewTagRoomList(list, tag)
 	}
 	return list
 }
 
 func (list *RoomList) Contains(roomID string) bool {
-	for _, tagRoomList := range list.items {
-		for _, room := range tagRoomList.All() {
+	for _, trl := range list.items {
+		for _, room := range trl.All() {
 			if room.ID == roomID {
 				return true
 			}
@@ -274,9 +87,9 @@ func (list *RoomList) Add(room *rooms.Room) {
 func (list *RoomList) CheckTag(tag string) {
 	index := list.IndexTag(tag)
 
-	tagRoomList, ok := list.items[tag]
+	trl, ok := list.items[tag]
 
-	if ok && tagRoomList.IsEmpty() {
+	if ok && trl.IsEmpty() {
 		//delete(list.items, tag)
 		ok = false
 	}
@@ -290,13 +103,13 @@ func (list *RoomList) CheckTag(tag string) {
 }
 
 func (list *RoomList) AddToTag(tag rooms.RoomTag, room *rooms.Room) {
-	tagRoomList, ok := list.items[tag.Tag]
+	trl, ok := list.items[tag.Tag]
 	if !ok {
-		list.items[tag.Tag] = newTagRoomList(convertRoom(room))
+		list.items[tag.Tag] = NewTagRoomList(list, tag.Tag, convertRoom(room))
 		return
 	}
 
-	tagRoomList.Insert(tag.Order, room)
+	trl.Insert(tag.Order, room)
 	list.CheckTag(tag.Tag)
 }
 
@@ -307,27 +120,27 @@ func (list *RoomList) Remove(room *rooms.Room) {
 }
 
 func (list *RoomList) RemoveFromTag(tag string, room *rooms.Room) {
-	tagRoomList, ok := list.items[tag]
+	trl, ok := list.items[tag]
 	if !ok {
 		return
 	}
 
-	index := tagRoomList.Index(room)
+	index := trl.Index(room)
 	if index == -1 {
 		return
 	}
 
-	tagRoomList.RemoveIndex(index)
+	trl.RemoveIndex(index)
 
-	if tagRoomList.IsEmpty() {
+	if trl.IsEmpty() {
 		// delete(list.items, tag)
 	}
 
 	if room == list.selected {
 		if index > 0 {
-			list.selected = tagRoomList.All()[index-1].Room
-		} else if tagRoomList.Length() > 0 {
-			list.selected = tagRoomList.Visible()[0].Room
+			list.selected = trl.All()[index-1].Room
+		} else if trl.Length() > 0 {
+			list.selected = trl.Visible()[0].Room
 		} else if len(list.items) > 0 {
 			for _, tag := range list.tags {
 				moreItems := list.items[tag]
@@ -346,19 +159,19 @@ func (list *RoomList) RemoveFromTag(tag string, room *rooms.Room) {
 
 func (list *RoomList) Bump(room *rooms.Room) {
 	for _, tag := range room.Tags() {
-		tagRoomList, ok := list.items[tag.Tag]
+		trl, ok := list.items[tag.Tag]
 		if !ok {
 			return
 		}
-		tagRoomList.Bump(room)
+		trl.Bump(room)
 	}
 }
 
 func (list *RoomList) Clear() {
-	list.items = make(map[string]*tagRoomList)
+	list.items = make(map[string]*TagRoomList)
 	list.tags = []string{"m.favourite", "net.maunium.gomuks.fake.direct", "", "m.lowpriority"}
 	for _, tag := range list.tags {
-		list.items[tag] = newTagRoomList()
+		list.items[tag] = NewTagRoomList(list, tag)
 	}
 	list.selected = nil
 	list.selectedTag = ""
@@ -406,9 +219,9 @@ func (list *RoomList) AddScrollOffset(offset int) {
 
 func (list *RoomList) First() (string, *rooms.Room) {
 	for _, tag := range list.tags {
-		tagRoomList := list.items[tag]
-		if tagRoomList.HasVisibleRooms() {
-			return tag, tagRoomList.FirstVisible()
+		trl := list.items[tag]
+		if trl.HasVisibleRooms() {
+			return tag, trl.FirstVisible()
 		}
 	}
 	return "", nil
@@ -417,9 +230,9 @@ func (list *RoomList) First() (string, *rooms.Room) {
 func (list *RoomList) Last() (string, *rooms.Room) {
 	for tagIndex := len(list.tags) - 1; tagIndex >= 0; tagIndex-- {
 		tag := list.tags[tagIndex]
-		tagRoomList := list.items[tag]
-		if tagRoomList.HasVisibleRooms() {
-			return tag, tagRoomList.LastVisible()
+		trl := list.items[tag]
+		if trl.HasVisibleRooms() {
+			return tag, trl.LastVisible()
 		}
 	}
 	return "", nil
@@ -441,28 +254,28 @@ func (list *RoomList) Previous() (string, *rooms.Room) {
 		return list.First()
 	}
 
-	tagRoomList := list.items[list.selectedTag]
-	index := tagRoomList.IndexVisible(list.selected)
-	indexInvisible := tagRoomList.Index(list.selected)
+	trl := list.items[list.selectedTag]
+	index := trl.IndexVisible(list.selected)
+	indexInvisible := trl.Index(list.selected)
 	if index == -1 && indexInvisible >= 0 {
-		num := tagRoomList.TotalLength() - indexInvisible
-		tagRoomList.maxShown = int(math.Ceil(float64(num)/10.0) * 10.0)
-		index = tagRoomList.IndexVisible(list.selected)
+		num := trl.TotalLength() - indexInvisible
+		trl.maxShown = int(math.Ceil(float64(num)/10.0) * 10.0)
+		index = trl.IndexVisible(list.selected)
 	}
 
-	if index == tagRoomList.Length()-1 {
+	if index == trl.Length()-1 {
 		tagIndex := list.IndexTag(list.selectedTag)
 		tagIndex--
 		for ; tagIndex >= 0; tagIndex-- {
 			prevTag := list.tags[tagIndex]
-			prevTagRoomList := list.items[prevTag]
-			if prevTagRoomList.HasVisibleRooms() {
-				return prevTag, prevTagRoomList.LastVisible()
+			prevTRL := list.items[prevTag]
+			if prevTRL.HasVisibleRooms() {
+				return prevTag, prevTRL.LastVisible()
 			}
 		}
 		return list.Last()
 	} else if index >= 0 {
-		return list.selectedTag, tagRoomList.Visible()[index+1].Room
+		return list.selectedTag, trl.Visible()[index+1].Room
 	}
 	return list.First()
 }
@@ -474,13 +287,13 @@ func (list *RoomList) Next() (string, *rooms.Room) {
 		return list.First()
 	}
 
-	tagRoomList := list.items[list.selectedTag]
-	index := tagRoomList.IndexVisible(list.selected)
-	indexInvisible := tagRoomList.Index(list.selected)
+	trl := list.items[list.selectedTag]
+	index := trl.IndexVisible(list.selected)
+	indexInvisible := trl.Index(list.selected)
 	if index == -1 && indexInvisible >= 0 {
-		num := tagRoomList.TotalLength() - indexInvisible + 1
-		tagRoomList.maxShown = int(math.Ceil(float64(num)/10.0) * 10.0)
-		index = tagRoomList.IndexVisible(list.selected)
+		num := trl.TotalLength() - indexInvisible + 1
+		trl.maxShown = int(math.Ceil(float64(num)/10.0) * 10.0)
+		index = trl.IndexVisible(list.selected)
 	}
 
 	if index == 0 {
@@ -488,14 +301,14 @@ func (list *RoomList) Next() (string, *rooms.Room) {
 		tagIndex++
 		for ; tagIndex < len(list.tags); tagIndex++ {
 			nextTag := list.tags[tagIndex]
-			nextTagRoomList := list.items[nextTag]
-			if nextTagRoomList.HasVisibleRooms() {
-				return nextTag, nextTagRoomList.FirstVisible()
+			nextTRL := list.items[nextTag]
+			if nextTRL.HasVisibleRooms() {
+				return nextTag, nextTRL.FirstVisible()
 			}
 		}
 		return list.First()
 	} else if index > 0 {
-		return list.selectedTag, tagRoomList.Visible()[index-1].Room
+		return list.selectedTag, trl.Visible()[index-1].Room
 	}
 	return list.Last()
 }
@@ -506,39 +319,24 @@ func (list *RoomList) index(tag string, room *rooms.Room) int {
 		return -1
 	}
 
-	tagRoomList, ok := list.items[tag]
+	trl, ok := list.items[tag]
 	localIndex := -1
 	if ok {
-		localIndex = tagRoomList.IndexVisible(room)
+		localIndex = trl.IndexVisible(room)
 	}
 	if localIndex == -1 {
 		return -1
 	}
-	localIndex = tagRoomList.Length() - 1 - localIndex
+	localIndex = trl.Length() - 1 - localIndex
 
 	// Tag header
 	localIndex += 1
 
 	if tagIndex > 0 {
 		for i := 0; i < tagIndex; i++ {
-			previousTag := list.tags[i]
-			previousTagRoomList := list.items[previousTag]
-
-			tagDisplayName := list.GetTagDisplayName(previousTag)
-			if len(tagDisplayName) > 0 {
-				if previousTagRoomList.IsCollapsed() {
-					localIndex++
-					continue
-				}
-				// Previous tag header + space
-				localIndex += 2
-				if previousTagRoomList.HasInvisibleRooms() {
-					// Previous tag "Show more" button
-					localIndex++
-				}
-				// Previous tag items
-				localIndex += previousTagRoomList.Length()
-			}
+			prevTag := list.tags[i]
+			prevTRL := list.items[prevTag]
+			localIndex += prevTRL.RenderHeight()
 		}
 	}
 
@@ -547,19 +345,7 @@ func (list *RoomList) index(tag string, room *rooms.Room) int {
 
 func (list *RoomList) ContentHeight() (height int) {
 	for _, tag := range list.tags {
-		tagRoomList := list.items[tag]
-		tagDisplayName := list.GetTagDisplayName(tag)
-		if len(tagDisplayName) == 0 {
-			continue
-		}
-		if tagRoomList.IsCollapsed() {
-			height++
-			continue
-		}
-		height += 2 + tagRoomList.Length()
-		if tagRoomList.HasInvisibleRooms() {
-			height++
-		}
+		height += list.items[tag].RenderHeight()
 	}
 	return
 }
@@ -570,27 +356,27 @@ func (list *RoomList) HandleClick(column, line int, mod bool) (string, *rooms.Ro
 		return "", nil
 	}
 	for _, tag := range list.tags {
-		tagRoomList := list.items[tag]
+		trl := list.items[tag]
 		if line--; line == -1 {
-			tagRoomList.ToggleCollapse()
+			trl.ToggleCollapse()
 			return "", nil
 		}
 
-		if tagRoomList.IsCollapsed() {
+		if trl.IsCollapsed() {
 			continue
 		}
 
 		if line < 0 {
 			return "", nil
-		} else if line < tagRoomList.Length() {
-			return tag, tagRoomList.Visible()[tagRoomList.Length()-1-line].Room
+		} else if line < trl.Length() {
+			return tag, trl.Visible()[trl.Length()-1-line].Room
 		}
 
 		// Tag items
-		line -= tagRoomList.Length()
+		line -= trl.Length()
 
-		hasMore := tagRoomList.HasInvisibleRooms()
-		hasLess := tagRoomList.maxShown > 10
+		hasMore := trl.HasInvisibleRooms()
+		hasLess := trl.maxShown > 10
 		if hasMore || hasLess {
 			if line--; line == -1 {
 				diff := 10
@@ -599,12 +385,12 @@ func (list *RoomList) HandleClick(column, line int, mod bool) (string, *rooms.Ro
 				}
 				_, _, width, _ := list.GetRect()
 				if column <= 6 && hasLess {
-					tagRoomList.maxShown -= diff
+					trl.maxShown -= diff
 				} else if column >= width-6 && hasMore {
-					tagRoomList.maxShown += diff
+					trl.maxShown += diff
 				}
-				if tagRoomList.maxShown < 10 {
-					tagRoomList.maxShown = 10
+				if trl.maxShown < 10 {
+					trl.maxShown = 10
 				}
 				return "", nil
 			}
@@ -641,108 +427,26 @@ func (list *RoomList) Draw(screen tcell.Screen) {
 	list.Box.Draw(screen)
 
 	x, y, width, height := list.GetInnerRect()
-	bottomLimit := y + height
-
-	handledOffset := 0
+	yLimit := y + height
+	y -= list.scrollOffset
 
 	// Draw the list items.
 	for _, tag := range list.tags {
-		tagRoomList := list.items[tag]
+		trl := list.items[tag]
 		tagDisplayName := list.GetTagDisplayName(tag)
 		if len(tagDisplayName) == 0 {
 			continue
 		}
 
-		localOffset := 0
-
-		if handledOffset < list.scrollOffset {
-			if handledOffset+tagRoomList.Length() < list.scrollOffset {
-				if tagRoomList.IsCollapsed() {
-					handledOffset++
-				} else {
-					handledOffset += tagRoomList.Length() + 2
-					if tagRoomList.HasInvisibleRooms() || tagRoomList.maxShown > 10 {
-						handledOffset++
-					}
-				}
-				continue
-			} else {
-				localOffset = list.scrollOffset - handledOffset
-				handledOffset += localOffset
-			}
-		}
-
-		roomCount := strconv.Itoa(tagRoomList.TotalLength())
-		widget.WriteLine(screen, tview.AlignLeft, tagDisplayName, x, y, width-1-len(roomCount), tcell.StyleDefault.Underline(true).Bold(true))
-		widget.WriteLine(screen, tview.AlignLeft, roomCount, x+len(tagDisplayName)+1, y, width-2-len(tagDisplayName), tcell.StyleDefault.Italic(true))
-
-		items := tagRoomList.Visible()
-
-		if tagRoomList.IsCollapsed() {
-			screen.SetCell(x+width-1, y, tcell.StyleDefault, '▶')
-			y++
-			continue
-		}
-		screen.SetCell(x+width-1, y, tcell.StyleDefault, '▼')
-		y++
-
-		for i := tagRoomList.Length() - 1; i >= 0; i-- {
-			item := items[i]
-			index := len(items) - 1 - i
-
-			if y >= bottomLimit {
-				break
-			}
-
-			if index < localOffset {
-				continue
-			}
-
-			text := item.GetTitle()
-
-			lineWidth := width
-
-			style := tcell.StyleDefault.Foreground(list.mainTextColor)
-			if tag == list.selectedTag && item.Room == list.selected {
-				style = style.Foreground(list.selectedTextColor).Background(list.selectedBackgroundColor)
-			}
-			if item.HasNewMessages() {
-				style = style.Bold(true)
-			}
-
-			unreadCount := item.UnreadCount()
-			if unreadCount > 0 {
-				unreadMessageCount := "99+"
-				if unreadCount < 100 {
-					unreadMessageCount = strconv.Itoa(unreadCount)
-				}
-				if item.Highlighted() {
-					unreadMessageCount += "!"
-				}
-				unreadMessageCount = fmt.Sprintf("(%s)", unreadMessageCount)
-				widget.WriteLine(screen, tview.AlignRight, unreadMessageCount, x+lineWidth-7, y, 7, style)
-				lineWidth -= len(unreadMessageCount)
-			}
-
-			widget.WriteLinePadded(screen, tview.AlignLeft, text, x, y, lineWidth, style)
-			y++
-
-			if y >= bottomLimit {
-				break
-			}
+		renderHeight := trl.RenderHeight()
+		if y + renderHeight >= yLimit {
+			renderHeight = yLimit - y
 		}
-		hasLess := tagRoomList.maxShown > 10
-		hasMore := tagRoomList.HasInvisibleRooms()
-		if hasLess || hasMore {
-			if hasMore {
-				widget.WriteLine(screen, tview.AlignRight, "More ↓", x, y, width, tcell.StyleDefault)
-			}
-			if hasLess {
-				widget.WriteLine(screen, tview.AlignLeft, "↑ Less", x, y, width, tcell.StyleDefault)
-			}
-			y++
+		trl.SetRect(x, y, width, renderHeight)
+		trl.Draw(screen)
+		y += renderHeight
+		if y >= yLimit {
+			break
 		}
-
-		y++
 	}
 }
diff --git a/ui/tag-room-list.go b/ui/tag-room-list.go
new file mode 100644
index 0000000..fb61c54
--- /dev/null
+++ b/ui/tag-room-list.go
@@ -0,0 +1,314 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package ui
+
+import (
+	"maunium.net/go/gomuks/matrix/rooms"
+	"strings"
+	"fmt"
+	"maunium.net/go/tcell"
+	"strconv"
+	"maunium.net/go/gomuks/ui/widget"
+	"maunium.net/go/tview"
+)
+
+type orderedRoom struct {
+	*rooms.Room
+	order string
+}
+
+func newOrderedRoom(order string, room *rooms.Room) *orderedRoom {
+	return &orderedRoom{
+		Room:  room,
+		order: order,
+	}
+}
+
+func convertRoom(room *rooms.Room) *orderedRoom {
+	return newOrderedRoom("0.5", room)
+}
+
+type TagRoomList struct {
+	*tview.Box
+	rooms       []*orderedRoom
+	maxShown    int
+	name        string
+	displayname string
+	parent      *RoomList
+}
+
+func NewTagRoomList(parent *RoomList, name string, rooms ...*orderedRoom) *TagRoomList {
+	return &TagRoomList{
+		Box:         tview.NewBox(),
+		maxShown:    10,
+		rooms:       rooms,
+		name:        name,
+		displayname: parent.GetTagDisplayName(name),
+		parent:      parent,
+	}
+}
+
+func (trl *TagRoomList) Visible() []*orderedRoom {
+	return trl.rooms[len(trl.rooms)-trl.Length():]
+}
+
+func (trl *TagRoomList) FirstVisible() *rooms.Room {
+	visible := trl.Visible()
+	if len(visible) > 0 {
+		return visible[len(visible)-1].Room
+	}
+	return nil
+}
+
+func (trl *TagRoomList) LastVisible() *rooms.Room {
+	visible := trl.Visible()
+	if len(visible) > 0 {
+		return visible[0].Room
+	}
+	return nil
+}
+
+func (trl *TagRoomList) All() []*orderedRoom {
+	return trl.rooms
+}
+
+func (trl *TagRoomList) Length() int {
+	if len(trl.rooms) < trl.maxShown {
+		return len(trl.rooms)
+	}
+	return trl.maxShown
+}
+
+func (trl *TagRoomList) TotalLength() int {
+	return len(trl.rooms)
+}
+
+func (trl *TagRoomList) IsEmpty() bool {
+	return len(trl.rooms) == 0
+}
+
+func (trl *TagRoomList) IsCollapsed() bool {
+	return trl.maxShown == 0
+}
+
+func (trl *TagRoomList) ToggleCollapse() {
+	if trl.IsCollapsed() {
+		trl.maxShown = 10
+	} else {
+		trl.maxShown = 0
+	}
+}
+
+func (trl *TagRoomList) HasInvisibleRooms() bool {
+	return trl.maxShown < trl.TotalLength()
+}
+
+func (trl *TagRoomList) HasVisibleRooms() bool {
+	return !trl.IsEmpty() && trl.maxShown > 0
+}
+
+// ShouldBeBefore returns if the first room should be after the second room in the room list.
+// The manual order and last received message timestamp are considered.
+func (trl *TagRoomList) ShouldBeAfter(room1 *orderedRoom, room2 *orderedRoom) bool {
+	orderComp := strings.Compare(room1.order, room2.order)
+	return orderComp == 1 || (orderComp == 0 && room2.LastReceivedMessage.After(room1.LastReceivedMessage))
+}
+
+func (trl *TagRoomList) Insert(order string, mxRoom *rooms.Room) {
+	room := newOrderedRoom(order, mxRoom)
+	trl.rooms = append(trl.rooms, nil)
+	// The default insert index is the newly added slot.
+	// That index will be used if all other rooms in the list have the same LastReceivedMessage timestamp.
+	insertAt := len(trl.rooms) - 1
+	// Find the spot where the new room should be put according to the last received message timestamps.
+	for i := 0; i < len(trl.rooms)-1; i++ {
+		if trl.ShouldBeAfter(room, trl.rooms[i]) {
+			insertAt = i
+			break
+		}
+	}
+	// Move newer rooms forward in the array.
+	for i := len(trl.rooms) - 1; i > insertAt; i-- {
+		trl.rooms[i] = trl.rooms[i-1]
+	}
+	// Insert room.
+	trl.rooms[insertAt] = room
+}
+
+func (trl *TagRoomList) String() string {
+	var str strings.Builder
+	fmt.Fprintln(&str, "&TagRoomList{")
+	fmt.Fprintf(&str, "    maxShown: %d,\n", trl.maxShown)
+	fmt.Fprint(&str, "    rooms: {")
+	for i, room := range trl.rooms {
+		if room == nil {
+			fmt.Fprintf(&str, "<<NIL>>")
+		} else {
+			fmt.Fprint(&str, room.ID)
+		}
+		if i != len(trl.rooms)-1 {
+			fmt.Fprint(&str, ", ")
+		}
+	}
+	fmt.Fprintln(&str, "},")
+	fmt.Fprintln(&str, "}")
+	return str.String()
+}
+
+func (trl *TagRoomList) Bump(mxRoom *rooms.Room) {
+	var found *orderedRoom
+	for i := 0; i < len(trl.rooms); i++ {
+		currentRoom := trl.rooms[i]
+		if found != nil {
+			if trl.ShouldBeAfter(found, trl.rooms[i]) {
+				// This room should be after the room being bumped, so insert the
+				// room being bumped here and return
+				trl.rooms[i-1] = found
+				return
+			}
+			// Move older rooms back in the array
+			trl.rooms[i-1] = currentRoom
+		} else if currentRoom.Room == mxRoom {
+			found = currentRoom
+		}
+	}
+	// If the room being bumped should be first in the list, it won't be inserted during the loop.
+	trl.rooms[len(trl.rooms)-1] = found
+}
+
+func (trl *TagRoomList) Remove(room *rooms.Room) {
+	trl.RemoveIndex(trl.Index(room))
+}
+
+func (trl *TagRoomList) RemoveIndex(index int) {
+	if index < 0 || index > len(trl.rooms) {
+		return
+	}
+	trl.rooms = append(trl.rooms[0:index], trl.rooms[index+1:]...)
+}
+
+func (trl *TagRoomList) Index(room *rooms.Room) int {
+	return trl.indexInList(trl.All(), room)
+}
+
+func (trl *TagRoomList) IndexVisible(room *rooms.Room) int {
+	return trl.indexInList(trl.Visible(), room)
+}
+
+func (trl *TagRoomList) indexInList(list []*orderedRoom, room *rooms.Room) int {
+	for index, entry := range list {
+		if entry.Room == room {
+			return index
+		}
+	}
+	return -1
+}
+
+var TagDisplayNameStyle = tcell.StyleDefault.Underline(true).Bold(true)
+var TagRoomCountStyle = tcell.StyleDefault.Italic(true)
+
+func (trl *TagRoomList) RenderHeight() int {
+	if len(trl.displayname) == 0 {
+		return 0
+	}
+
+	if trl.IsCollapsed() {
+		return 1
+	}
+	height := 2 + trl.Length()
+	if trl.HasInvisibleRooms() || trl.maxShown > 10 {
+		height++
+	}
+	return height
+}
+
+func (trl *TagRoomList) Draw(screen tcell.Screen) {
+	if len(trl.displayname) == 0 {
+		return
+	}
+
+	x, y, width, height := trl.GetRect()
+	yLimit := y + height
+
+	roomCount := strconv.Itoa(trl.TotalLength())
+
+	// Draw tag name
+	displayNameWidth := width - 1 - len(roomCount)
+	widget.WriteLine(screen, tview.AlignLeft, trl.displayname, x, y, displayNameWidth, TagDisplayNameStyle)
+
+	// Draw tag room count
+	roomCountX := x + len(trl.displayname) + 1
+	roomCountWidth := width - 2 - len(trl.displayname)
+	widget.WriteLine(screen, tview.AlignLeft, roomCount, roomCountX, y, roomCountWidth, TagRoomCountStyle)
+
+	items := trl.Visible()
+
+	if trl.IsCollapsed() {
+		screen.SetCell(x+width-1, y, tcell.StyleDefault, '▶')
+		return
+	}
+	screen.SetCell(x+width-1, y, tcell.StyleDefault, '▼')
+
+	offsetY := 1
+	for i := trl.Length() - 1; i >= 0; i-- {
+		if y+offsetY >= yLimit {
+			return
+		}
+
+		item := items[i]
+
+		text := item.GetTitle()
+
+		lineWidth := width
+
+		style := tcell.StyleDefault.Foreground(trl.parent.mainTextColor)
+		if trl.name == trl.parent.selectedTag && item.Room == trl.parent.selected {
+			style = style.Foreground(trl.parent.selectedTextColor).Background(trl.parent.selectedBackgroundColor)
+		}
+		if item.HasNewMessages() {
+			style = style.Bold(true)
+		}
+
+		unreadCount := item.UnreadCount()
+		if unreadCount > 0 {
+			unreadMessageCount := "99+"
+			if unreadCount < 100 {
+				unreadMessageCount = strconv.Itoa(unreadCount)
+			}
+			if item.Highlighted() {
+				unreadMessageCount += "!"
+			}
+			unreadMessageCount = fmt.Sprintf("(%s)", unreadMessageCount)
+			widget.WriteLine(screen, tview.AlignRight, unreadMessageCount, x+lineWidth-7, y+offsetY, 7, style)
+			lineWidth -= len(unreadMessageCount)
+		}
+
+		widget.WriteLinePadded(screen, tview.AlignLeft, text, x, y+offsetY, lineWidth, style)
+		offsetY++
+	}
+	hasLess := trl.maxShown > 10
+	hasMore := trl.HasInvisibleRooms()
+	if (hasLess || hasMore) && y+offsetY < yLimit {
+		if hasMore {
+			widget.WriteLine(screen, tview.AlignRight, "More ↓", x, y+offsetY, width, tcell.StyleDefault)
+		}
+		if hasLess {
+			widget.WriteLine(screen, tview.AlignLeft, "↑ Less", x, y+offsetY, width, tcell.StyleDefault)
+		}
+		offsetY++
+	}
+}