gomuks/ui/widget/message-view.go

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// 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/>.
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package widget
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import (
"fmt"
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"time"
"github.com/gdamore/tcell"
"github.com/mattn/go-runewidth"
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"maunium.net/go/gomuks/ui/types"
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"maunium.net/go/tview"
)
type MessageView struct {
*tview.Box
ScrollOffset int
MaxSenderWidth int
DateFormat string
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TimestampFormat string
TimestampWidth int
Separator rune
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LoadingMessages bool
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widestSender int
prevWidth int
prevHeight int
prevMsgCount int
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messageIDs map[string]*types.Message
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messages []*types.Message
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textBuffer []string
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metaBuffer []types.MessageMeta
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}
func NewMessageView() *MessageView {
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return &MessageView{
Box: tview.NewBox(),
MaxSenderWidth: 20,
DateFormat: "January _2, 2006",
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TimestampFormat: "15:04:05",
TimestampWidth: 8,
Separator: '|',
ScrollOffset: 0,
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messages: make([]*types.Message, 0),
messageIDs: make(map[string]*types.Message),
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textBuffer: make([]string, 0),
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metaBuffer: make([]types.MessageMeta, 0),
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widestSender: 5,
prevWidth: -1,
prevHeight: -1,
prevMsgCount: -1,
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}
}
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func (view *MessageView) NewMessage(id, sender, text string, timestamp time.Time) *types.Message {
return types.NewMessage(id, sender, text,
timestamp.Format(view.TimestampFormat),
timestamp.Format(view.DateFormat),
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GetHashColor(sender))
}
func (view *MessageView) updateWidestSender(sender string) {
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if len(sender) > view.widestSender {
view.widestSender = len(sender)
if view.widestSender > view.MaxSenderWidth {
view.widestSender = view.MaxSenderWidth
}
}
}
type MessageDirection int
const (
AppendMessage MessageDirection = iota
PrependMessage
IgnoreMessage
)
func (view *MessageView) UpdateMessageID(message *types.Message, newID string) {
delete(view.messageIDs, message.ID)
message.ID = newID
view.messageIDs[message.ID] = message
}
func (view *MessageView) AddMessage(message *types.Message, direction MessageDirection) {
msg, messageExists := view.messageIDs[message.ID]
if messageExists {
message.CopyTo(msg)
direction = IgnoreMessage
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}
view.updateWidestSender(message.Sender)
_, _, width, _ := view.GetInnerRect()
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width -= view.TimestampWidth + TimestampSenderGap + view.widestSender + SenderMessageGap
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message.CalculateBuffer(width)
if direction == AppendMessage {
if view.ScrollOffset > 0 {
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view.ScrollOffset += len(message.Buffer)
}
view.messages = append(view.messages, message)
view.appendBuffer(message)
} else if direction == PrependMessage {
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view.messages = append([]*types.Message{message}, view.messages...)
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}
view.messageIDs[message.ID] = message
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}
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func (view *MessageView) appendBuffer(message *types.Message) {
if len(view.metaBuffer) > 0 {
prevMeta := view.metaBuffer[len(view.metaBuffer)-1]
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if prevMeta != nil && prevMeta.GetDate() != message.Date {
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view.textBuffer = append(view.textBuffer, fmt.Sprintf("Date changed to %s", message.Date))
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view.metaBuffer = append(view.metaBuffer, &types.BasicMeta{TextColor: tcell.ColorGreen})
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}
}
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view.textBuffer = append(view.textBuffer, message.Buffer...)
for range message.Buffer {
view.metaBuffer = append(view.metaBuffer, message)
}
view.prevMsgCount++
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}
func (view *MessageView) recalculateBuffers() {
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_, _, width, height := view.GetInnerRect()
width -= view.TimestampWidth + TimestampSenderGap + view.widestSender + SenderMessageGap
recalculateMessageBuffers := width != view.prevWidth
if height != view.prevHeight || recalculateMessageBuffers || len(view.messages) != view.prevMsgCount {
view.textBuffer = []string{}
view.metaBuffer = []types.MessageMeta{}
view.prevMsgCount = 0
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for _, message := range view.messages {
if recalculateMessageBuffers {
message.CalculateBuffer(width)
}
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view.appendBuffer(message)
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}
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view.prevHeight = height
view.prevWidth = width
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}
}
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const PaddingAtTop = 5
func (view *MessageView) MoveUp(page bool) {
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_, _, _, height := view.GetInnerRect()
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totalHeight := len(view.textBuffer)
if view.ScrollOffset >= totalHeight-height {
// If the user is at the top and presses page up again, add a bit of blank space.
if page {
view.ScrollOffset = totalHeight - height + PaddingAtTop
} else if view.ScrollOffset < totalHeight-height+PaddingAtTop {
view.ScrollOffset++
}
return
}
if page {
view.ScrollOffset += height / 2
} else {
view.ScrollOffset++
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}
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if view.ScrollOffset > totalHeight-height {
view.ScrollOffset = totalHeight - height
}
}
func (view *MessageView) IsAtTop() bool {
_, _, _, height := view.GetInnerRect()
totalHeight := len(view.textBuffer)
return view.ScrollOffset >= totalHeight-height+PaddingAtTop
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}
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func (view *MessageView) MoveDown(page bool) {
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_, _, _, height := view.GetInnerRect()
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if page {
view.ScrollOffset -= height / 2
} else {
view.ScrollOffset--
}
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if view.ScrollOffset < 0 {
view.ScrollOffset = 0
}
}
func (view *MessageView) writeLine(screen tcell.Screen, line string, x, y int, color tcell.Color) {
offsetX := 0
for _, ch := range line {
chWidth := runewidth.RuneWidth(ch)
if chWidth == 0 {
continue
}
for localOffset := 0; localOffset < chWidth; localOffset++ {
screen.SetContent(x+offsetX+localOffset, y, ch, nil, tcell.StyleDefault.Foreground(color))
}
offsetX += chWidth
}
}
func (view *MessageView) writeLineRight(screen tcell.Screen, line string, x, y, maxWidth int, color tcell.Color) {
offsetX := maxWidth - runewidth.StringWidth(line)
if offsetX < 0 {
offsetX = 0
}
for _, ch := range line {
chWidth := runewidth.RuneWidth(ch)
if chWidth == 0 {
continue
}
for localOffset := 0; localOffset < chWidth; localOffset++ {
screen.SetContent(x+offsetX+localOffset, y, ch, nil, tcell.StyleDefault.Foreground(color))
}
offsetX += chWidth
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if offsetX > maxWidth {
break
}
}
}
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const (
TimestampSenderGap = 1
SenderSeparatorGap = 1
SenderMessageGap = 3
)
func (view *MessageView) Draw(screen tcell.Screen) {
view.Box.Draw(screen)
x, y, _, height := view.GetInnerRect()
view.recalculateBuffers()
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if len(view.textBuffer) == 0 {
view.writeLine(screen, "It's quite empty in here.", x, y+height, tcell.ColorDefault)
return
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}
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usernameOffsetX := view.TimestampWidth + TimestampSenderGap
messageOffsetX := usernameOffsetX + view.widestSender + SenderMessageGap
separatorX := x + usernameOffsetX + view.widestSender + SenderSeparatorGap
for separatorY := y; separatorY < y+height; separatorY++ {
screen.SetContent(separatorX, separatorY, view.Separator, nil, tcell.StyleDefault)
}
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var prevMeta types.MessageMeta
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indexOffset := len(view.textBuffer) - view.ScrollOffset - height
if indexOffset <= -PaddingAtTop {
message := "Scroll up to load more messages."
if view.LoadingMessages {
message = "Loading more messages..."
}
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view.writeLine(screen, message, x+messageOffsetX, y, tcell.ColorGreen)
}
for line := 0; line < height; line++ {
index := indexOffset + line
if index < 0 {
continue
} else if index > len(view.textBuffer) {
break
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}
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text, meta := view.textBuffer[index], view.metaBuffer[index]
if meta != prevMeta {
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if len(meta.GetTimestamp()) > 0 {
view.writeLine(screen, meta.GetTimestamp(), x, y+line, meta.GetTimestampColor())
}
if len(meta.GetSender()) > 0 && (prevMeta == nil || meta.GetSender() != prevMeta.GetSender()) {
view.writeLineRight(
screen, meta.GetSender(),
x+usernameOffsetX, y+line,
view.widestSender, meta.GetSenderColor())
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}
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prevMeta = meta
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}
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view.writeLine(screen, text, x+messageOffsetX, y+line, meta.GetTextColor())
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}
}