diff options
Diffstat (limited to 'vendor/maunium.net/go/tview/textview.go')
| -rw-r--r-- | vendor/maunium.net/go/tview/textview.go | 899 |
1 files changed, 899 insertions, 0 deletions
diff --git a/vendor/maunium.net/go/tview/textview.go b/vendor/maunium.net/go/tview/textview.go new file mode 100644 index 0000000..8de0121 --- /dev/null +++ b/vendor/maunium.net/go/tview/textview.go @@ -0,0 +1,899 @@ +package tview + +import ( + "bytes" + "fmt" + "regexp" + "sync" + "unicode/utf8" + + "maunium.net/go/tcell" + runewidth "github.com/mattn/go-runewidth" +) + +// TabSize is the number of spaces with which a tab character will be replaced. +var TabSize = 4 + +// textViewIndex contains information about each line displayed in the text +// view. +type textViewIndex struct { + Line int // The index into the "buffer" variable. + Pos int // The index into the "buffer" string (byte position). + NextPos int // The (byte) index of the next character in this buffer line. + Width int // The screen width of this line. + Color tcell.Color // The starting color. + Region string // The starting region ID. +} + +// TextView is a box which displays text. It implements the io.Writer interface +// so you can stream text to it. This does not trigger a redraw automatically +// but if a handler is installed via SetChangedFunc(), you can cause it to be +// redrawn. +// +// Navigation +// +// If the text view is scrollable (the default), text is kept in a buffer which +// may be larger than the screen and can be navigated similarly to Vim: +// +// - h, left arrow: Move left. +// - l, right arrow: Move right. +// - j, down arrow: Move down. +// - k, up arrow: Move up. +// - g, home: Move to the top. +// - G, end: Move to the bottom. +// - Ctrl-F, page down: Move down by one page. +// - Ctrl-B, page up: Move up by one page. +// +// If the text is not scrollable, any text above the top visible line is +// discarded. +// +// Use SetInputCapture() to override or modify keyboard input. +// +// Colors +// +// If dynamic colors are enabled via SetDynamicColors(), text color can be +// changed dynamically by embedding color strings in square brackets. This works +// the same way as anywhere else. Please see the package documentation for more +// information. +// +// Regions and Highlights +// +// If regions are enabled via SetRegions(), you can define text regions within +// the text and assign region IDs to them. Text regions start with region tags. +// Region tags are square brackets that contain a region ID in double quotes, +// for example: +// +// We define a ["rg"]region[""] here. +// +// A text region ends with the next region tag. Tags with no region ID ([""]) +// don't start new regions. They can therefore be used to mark the end of a +// region. Region IDs must satisfy the following regular expression: +// +// [a-zA-Z0-9_,;: \-\.]+ +// +// Regions can be highlighted by calling the Highlight() function with one or +// more region IDs. This can be used to display search results, for example. +// +// The ScrollToHighlight() function can be used to jump to the currently +// highlighted region once when the text view is drawn the next time. +// +// See https://github.com/rivo/tview/wiki/TextView for an example. +type TextView struct { + sync.Mutex + *Box + + // The text buffer. + buffer []string + + // The last bytes that have been received but are not part of the buffer yet. + recentBytes []byte + + // The processed line index. This is nil if the buffer has changed and needs + // to be re-indexed. + index []*textViewIndex + + // The text alignment, one of AlignLeft, AlignCenter, or AlignRight. + align int + + // Indices into the "index" slice which correspond to the first line of the + // first highlight and the last line of the last highlight. This is calculated + // during re-indexing. Set to -1 if there is no current highlight. + fromHighlight, toHighlight int + + // A set of region IDs that are currently highlighted. + highlights map[string]struct{} + + // The last width for which the current table is drawn. + lastWidth int + + // The screen width of the longest line in the index (not the buffer). + longestLine int + + // The index of the first line shown in the text view. + lineOffset int + + // If set to true, the text view will always remain at the end of the content. + trackEnd bool + + // The number of characters to be skipped on each line (not in wrap mode). + columnOffset int + + // The height of the content the last time the text view was drawn. + pageSize int + + // If set to true, the text view will keep a buffer of text which can be + // navigated when the text is longer than what fits into the box. + scrollable bool + + // If set to true, lines that are longer than the available width are wrapped + // onto the next line. If set to false, any characters beyond the available + // width are discarded. + wrap bool + + // If set to true and if wrap is also true, lines are split at spaces or + // after punctuation characters. + wordWrap bool + + // The (starting) color of the text. + textColor tcell.Color + + // If set to true, the text color can be changed dynamically by piping color + // strings in square brackets to the text view. + dynamicColors bool + + // If set to true, region tags can be used to define regions. + regions bool + + // A temporary flag which, when true, will automatically bring the current + // highlight(s) into the visible screen. + scrollToHighlights bool + + // An optional function which is called when the content of the text view has + // changed. + changed func() + + // An optional function which is called when the user presses one of the + // following keys: Escape, Enter, Tab, Backtab. + done func(tcell.Key) +} + +// NewTextView returns a new text view. +func NewTextView() *TextView { + return &TextView{ + Box: NewBox(), + highlights: make(map[string]struct{}), + lineOffset: -1, + scrollable: true, + align: AlignLeft, + wrap: true, + textColor: Styles.PrimaryTextColor, + dynamicColors: false, + } +} + +// SetScrollable sets the flag that decides whether or not the text view is +// scrollable. If true, text is kept in a buffer and can be navigated. +func (t *TextView) SetScrollable(scrollable bool) *TextView { + t.scrollable = scrollable + if !scrollable { + t.trackEnd = true + } + return t +} + +// SetWrap sets the flag that, if true, leads to lines that are longer than the +// available width being wrapped onto the next line. If false, any characters +// beyond the available width are not displayed. +func (t *TextView) SetWrap(wrap bool) *TextView { + if t.wrap != wrap { + t.index = nil + } + t.wrap = wrap + return t +} + +// SetWordWrap sets the flag that, if true and if the "wrap" flag is also true +// (see SetWrap()), wraps the line at spaces or after punctuation marks. Note +// that trailing spaces will not be printed. +// +// This flag is ignored if the "wrap" flag is false. +func (t *TextView) SetWordWrap(wrapOnWords bool) *TextView { + if t.wordWrap != wrapOnWords { + t.index = nil + } + t.wordWrap = wrapOnWords + return t +} + +// SetTextAlign sets the text alignment within the text view. This must be +// either AlignLeft, AlignCenter, or AlignRight. +func (t *TextView) SetTextAlign(align int) *TextView { + if t.align != align { + t.index = nil + } + t.align = align + return t +} + +// SetTextColor sets the initial color of the text (which can be changed +// dynamically by sending color strings in square brackets to the text view if +// dynamic colors are enabled). +func (t *TextView) SetTextColor(color tcell.Color) *TextView { + t.textColor = color + return t +} + +// SetText sets the text of this text view to the provided string. Previously +// contained text will be removed. +func (t *TextView) SetText(text string) *TextView { + t.Clear() + fmt.Fprint(t, text) + return t +} + +// SetDynamicColors sets the flag that allows the text color to be changed +// dynamically. See class description for details. +func (t *TextView) SetDynamicColors(dynamic bool) *TextView { + if t.dynamicColors != dynamic { + t.index = nil + } + t.dynamicColors = dynamic + return t +} + +// SetRegions sets the flag that allows to define regions in the text. See class +// description for details. +func (t *TextView) SetRegions(regions bool) *TextView { + if t.regions != regions { + t.index = nil + } + t.regions = regions + return t +} + +// SetChangedFunc sets a handler function which is called when the text of the +// text view has changed. This is typically used to cause the application to +// redraw the screen. +func (t *TextView) SetChangedFunc(handler func()) *TextView { + t.changed = handler + return t +} + +// SetDoneFunc sets a handler which is called when the user presses on the +// following keys: Escape, Enter, Tab, Backtab. The key is passed to the +// handler. +func (t *TextView) SetDoneFunc(handler func(key tcell.Key)) *TextView { + t.done = handler + return t +} + +// ScrollToBeginning scrolls to the top left corner of the text if the text view +// is scrollable. +func (t *TextView) ScrollToBeginning() *TextView { + if !t.scrollable { + return t + } + t.trackEnd = false + t.lineOffset = 0 + t.columnOffset = 0 + return t +} + +// ScrollToEnd scrolls to the bottom left corner of the text if the text view +// is scrollable. Adding new rows to the end of the text view will cause it to +// scroll with the new data. +func (t *TextView) ScrollToEnd() *TextView { + if !t.scrollable { + return t + } + t.trackEnd = true + t.columnOffset = 0 + return t +} + +// Clear removes all text from the buffer. +func (t *TextView) Clear() *TextView { + t.buffer = nil + t.recentBytes = nil + t.index = nil + return t +} + +// Highlight specifies which regions should be highlighted. See class +// description for details on regions. Empty region strings are ignored. +// +// Text in highlighted regions will be drawn inverted, i.e. with their +// background and foreground colors swapped. +// +// Calling this function will remove any previous highlights. To remove all +// highlights, call this function without any arguments. +func (t *TextView) Highlight(regionIDs ...string) *TextView { + t.highlights = make(map[string]struct{}) + for _, id := range regionIDs { + if id == "" { + continue + } + t.highlights[id] = struct{}{} + } + t.index = nil + return t +} + +// GetHighlights returns the IDs of all currently highlighted regions. +func (t *TextView) GetHighlights() (regionIDs []string) { + for id := range t.highlights { + regionIDs = append(regionIDs, id) + } + return +} + +// ScrollToHighlight will cause the visible area to be scrolled so that the +// highlighted regions appear in the visible area of the text view. This +// repositioning happens the next time the text view is drawn. It happens only +// once so you will need to call this function repeatedly to always keep +// highlighted regions in view. +// +// Nothing happens if there are no highlighted regions or if the text view is +// not scrollable. +func (t *TextView) ScrollToHighlight() *TextView { + if len(t.highlights) == 0 || !t.scrollable || !t.regions { + return t + } + t.index = nil + t.scrollToHighlights = true + t.trackEnd = false + return t +} + +// GetRegionText returns the text of the region with the given ID. If dynamic +// colors are enabled, color tags are stripped from the text. Newlines are +// always returned as '\n' runes. +// +// If the region does not exist or if regions are turned off, an empty string +// is returned. +func (t *TextView) GetRegionText(regionID string) string { + if !t.regions || regionID == "" { + return "" + } + + var ( + buffer bytes.Buffer + currentRegionID string + ) + + for _, str := range t.buffer { + // Find all color tags in this line. + var colorTagIndices [][]int + if t.dynamicColors { + colorTagIndices = colorPattern.FindAllStringIndex(str, -1) + } + + // Find all regions in this line. + var ( + regionIndices [][]int + regions [][]string + ) + if t.regions { + regionIndices = regionPattern.FindAllStringIndex(str, -1) + regions = regionPattern.FindAllStringSubmatch(str, -1) + } + + // Analyze this line. + var currentTag, currentRegion int + for pos, ch := range str { + // Skip any color tags. + if currentTag < len(colorTagIndices) && pos >= colorTagIndices[currentTag][0] && pos < colorTagIndices[currentTag][1] { + if pos == colorTagIndices[currentTag][1]-1 { + currentTag++ + } + continue + } + + // Skip any regions. + if currentRegion < len(regionIndices) && pos >= regionIndices[currentRegion][0] && pos < regionIndices[currentRegion][1] { + if pos == regionIndices[currentRegion][1]-1 { + if currentRegionID == regionID { + // This is the end of the requested region. We're done. + return buffer.String() + } + currentRegionID = regions[currentRegion][1] + currentRegion++ + } + continue + } + + // Add this rune. + if currentRegionID == regionID { + buffer.WriteRune(ch) + } + } + + // Add newline. + if currentRegionID == regionID { + buffer.WriteRune('\n') + } + } + + return escapePattern.ReplaceAllString(buffer.String(), `[$1$2]`) +} + +// Write lets us implement the io.Writer interface. Tab characters will be +// replaced with TabSize space characters. A "\n" or "\r\n" will be interpreted +// as a new line. +func (t *TextView) Write(p []byte) (n int, err error) { + // Notify at the end. + if t.changed != nil { + defer t.changed() + } + + t.Lock() + defer t.Unlock() + + // Copy data over. + newBytes := append(t.recentBytes, p...) + t.recentBytes = nil + + // If we have a trailing invalid UTF-8 byte, we'll wait. + if r, _ := utf8.DecodeLastRune(p); r == utf8.RuneError { + t.recentBytes = newBytes + return len(p), nil + } + + // If we have a trailing open dynamic color, exclude it. + if t.dynamicColors { + openColor := regexp.MustCompile(`\[([a-zA-Z]*|#[0-9a-zA-Z]*)$`) + location := openColor.FindIndex(newBytes) + if location != nil { + t.recentBytes = newBytes[location[0]:] + newBytes = newBytes[:location[0]] + } + } + + // If we have a trailing open region, exclude it. + if t.regions { + openRegion := regexp.MustCompile(`\["[a-zA-Z0-9_,;: \-\.]*"?$`) + location := openRegion.FindIndex(newBytes) + if location != nil { + t.recentBytes = newBytes[location[0]:] + newBytes = newBytes[:location[0]] + } + } + + // Transform the new bytes into strings. + newLine := regexp.MustCompile(`\r?\n`) + newBytes = bytes.Replace(newBytes, []byte{'\t'}, bytes.Repeat([]byte{' '}, TabSize), -1) + for index, line := range newLine.Split(string(newBytes), -1) { + if index == 0 { + if len(t.buffer) == 0 { + t.buffer = []string{line} + } else { + t.buffer[len(t.buffer)-1] += line + } + } else { + t.buffer = append(t.buffer, line) + } + } + + // Reset the index. + t.index = nil + + return len(p), nil +} + +// reindexBuffer re-indexes the buffer such that we can use it to easily draw +// the buffer onto the screen. Each line in the index will contain a pointer +// into the buffer from which on we will print text. It will also contain the +// color with which the line starts. +func (t *TextView) reindexBuffer(width int) { + if t.index != nil { + return // Nothing has changed. We can still use the current index. + } + t.index = nil + t.fromHighlight, t.toHighlight = -1, -1 + + // If there's no space, there's no index. + if width < 1 { + return + } + + // Initial states. + regionID := "" + var highlighted bool + color := t.textColor + + // Go through each line in the buffer. + for bufferIndex, str := range t.buffer { + // Find all color tags in this line. Then remove them. + var ( + colorTagIndices [][]int + colorTags [][]string + ) + if t.dynamicColors { + colorTagIndices = colorPattern.FindAllStringIndex(str, -1) + colorTags = colorPattern.FindAllStringSubmatch(str, -1) + str = colorPattern.ReplaceAllString(str, "") + } + + // Find all regions in this line. Then remove them. + var ( + regionIndices [][]int + regions [][]string + ) + if t.regions { + regionIndices = regionPattern.FindAllStringIndex(str, -1) + regions = regionPattern.FindAllStringSubmatch(str, -1) + str = regionPattern.ReplaceAllString(str, "") + } + + // Find all replace tags in this line. Then replace them. + var escapeIndices [][]int + if t.dynamicColors || t.regions { + escapeIndices = escapePattern.FindAllStringIndex(str, -1) + str = escapePattern.ReplaceAllString(str, "[$1$2]") + } + + // Split the line if required. + var splitLines []string + if t.wrap && len(str) > 0 { + for len(str) > 0 { + extract := runewidth.Truncate(str, width, "") + if t.wordWrap && len(extract) < len(str) { + // Add any spaces from the next line. + if spaces := spacePattern.FindStringIndex(str[len(extract):]); spaces != nil && spaces[0] == 0 { + extract = str[:len(extract)+spaces[1]] + } + + // Can we split before the mandatory end? + matches := boundaryPattern.FindAllStringIndex(extract, -1) + if len(matches) > 0 { + // Yes. Let's split there. + extract = extract[:matches[len(matches)-1][1]] + } + } + splitLines = append(splitLines, extract) + str = str[len(extract):] + } + } else { + // No need to split the line. + splitLines = []string{str} + } + + // Create index from split lines. + var originalPos, colorPos, regionPos, escapePos int + for _, splitLine := range splitLines { + line := &textViewIndex{ + Line: bufferIndex, + Pos: originalPos, + Color: color, + Region: regionID, + } + + // Shift original position with tags. + lineLength := len(splitLine) + for { + if colorPos < len(colorTagIndices) && colorTagIndices[colorPos][0] <= originalPos+lineLength { + // Process color tags. + originalPos += colorTagIndices[colorPos][1] - colorTagIndices[colorPos][0] + color = tcell.GetColor(colorTags[colorPos][1]) + colorPos++ + } else if regionPos < len(regionIndices) && regionIndices[regionPos][0] <= originalPos+lineLength { + // Process region tags. + originalPos += regionIndices[regionPos][1] - regionIndices[regionPos][0] + regionID = regions[regionPos][1] + _, highlighted = t.highlights[regionID] + + // Update highlight range. + if highlighted { + line := len(t.index) + if t.fromHighlight < 0 { + t.fromHighlight, t.toHighlight = line, line + } else if line > t.toHighlight { + t.toHighlight = line + } + } + + regionPos++ + } else if escapePos < len(escapeIndices) && escapeIndices[escapePos][0] <= originalPos+lineLength { + // Process escape tags. + originalPos++ + escapePos++ + } else { + break + } + } + + // Advance to next line. + originalPos += lineLength + + // Append this line. + line.NextPos = originalPos + line.Width = runewidth.StringWidth(splitLine) + t.index = append(t.index, line) + } + + // Word-wrapped lines may have trailing whitespace. Remove it. + if t.wrap && t.wordWrap { + for _, line := range t.index { + str := t.buffer[line.Line][line.Pos:line.NextPos] + spaces := spacePattern.FindAllStringIndex(str, -1) + if spaces != nil && spaces[len(spaces)-1][1] == len(str) { + oldNextPos := line.NextPos + line.NextPos -= spaces[len(spaces)-1][1] - spaces[len(spaces)-1][0] + line.Width -= runewidth.StringWidth(t.buffer[line.Line][line.NextPos:oldNextPos]) + } + } + } + } + + // Calculate longest line. + t.longestLine = 0 + for _, line := range t.index { + if line.Width > t.longestLine { + t.longestLine = line.Width + } + } +} + +// Draw draws this primitive onto the screen. +func (t *TextView) Draw(screen tcell.Screen) { + t.Lock() + defer t.Unlock() + t.Box.Draw(screen) + + // Get the available size. + x, y, width, height := t.GetInnerRect() + t.pageSize = height + + // If the width has changed, we need to reindex. + if width != t.lastWidth { + t.index = nil + } + t.lastWidth = width + + // Re-index. + t.reindexBuffer(width) + + // If we don't have an index, there's nothing to draw. + if t.index == nil { + return + } + + // Move to highlighted regions. + if t.regions && t.scrollToHighlights && t.fromHighlight >= 0 { + // Do we fit the entire height? + if t.toHighlight-t.fromHighlight+1 < height { + // Yes, let's center the highlights. + t.lineOffset = (t.fromHighlight + t.toHighlight - height) / 2 + } else { + // No, let's move to the start of the highlights. + t.lineOffset = t.fromHighlight + } + } + t.scrollToHighlights = false + + // Adjust line offset. + if t.lineOffset+height > len(t.index) { + t.trackEnd = true + } + if t.trackEnd { + t.lineOffset = len(t.index) - height + } + if t.lineOffset < 0 { + t.lineOffset = 0 + } + + // Adjust column offset. + if t.align == AlignLeft { + if t.columnOffset+width > t.longestLine { + t.columnOffset = t.longestLine - width + } + if t.columnOffset < 0 { + t.columnOffset = 0 + } + } else if t.align == AlignRight { + if t.columnOffset-width < -t.longestLine { + t.columnOffset = width - t.longestLine + } + if t.columnOffset > 0 { + t.columnOffset = 0 + } + } else { // AlignCenter. + half := (t.longestLine - width) / 2 + if half > 0 { + if t.columnOffset > half { + t.columnOffset = half + } + if t.columnOffset < -half { + t.columnOffset = -half + } + } else { + t.columnOffset = 0 + } + } + + // Draw the buffer. + for line := t.lineOffset; line < len(t.index); line++ { + // Are we done? + if line-t.lineOffset >= height { + break + } + + // Get the text for this line. + index := t.index[line] + text := t.buffer[index.Line][index.Pos:index.NextPos] + color := index.Color + regionID := index.Region + + // Get color tags. + var ( + colorTagIndices [][]int + colorTags [][]string + ) + if t.dynamicColors { + colorTagIndices = colorPattern.FindAllStringIndex(text, -1) + colorTags = colorPattern.FindAllStringSubmatch(text, -1) + } + + // Get regions. + var ( + regionIndices [][]int + regions [][]string + ) + if t.regions { + regionIndices = regionPattern.FindAllStringIndex(text, -1) + regions = regionPattern.FindAllStringSubmatch(text, -1) + } + + // Get escape tags. + var escapeIndices [][]int + if t.dynamicColors || t.regions { + escapeIndices = escapePattern.FindAllStringIndex(text, -1) + } + + // Calculate the position of the line. + var skip, posX int + if t.align == AlignLeft { + posX = -t.columnOffset + } else if t.align == AlignRight { + posX = width - index.Width - t.columnOffset + } else { // AlignCenter. + posX = (width-index.Width)/2 - t.columnOffset + } + if posX < 0 { + skip = -posX + posX = 0 + } + + // Print the line. + var currentTag, currentRegion, currentEscapeTag, skipped int + for pos, ch := range text { + // Get the color. + if currentTag < len(colorTags) && pos >= colorTagIndices[currentTag][0] && pos < colorTagIndices[currentTag][1] { + if pos == colorTagIndices[currentTag][1]-1 { + color = tcell.GetColor(colorTags[currentTag][1]) + currentTag++ + } + continue + } + + // Get the region. + if currentRegion < len(regionIndices) && pos >= regionIndices[currentRegion][0] && pos < regionIndices[currentRegion][1] { + if pos == regionIndices[currentRegion][1]-1 { + regionID = regions[currentRegion][1] + currentRegion++ + } + continue + } + + // Skip the second-to-last character of an escape tag. + if currentEscapeTag < len(escapeIndices) && pos >= escapeIndices[currentEscapeTag][0] && pos < escapeIndices[currentEscapeTag][1] { + if pos == escapeIndices[currentEscapeTag][1]-1 { + currentEscapeTag++ + } else if pos == escapeIndices[currentEscapeTag][1]-2 { + continue + } + } + + // Determine the width of this rune. + chWidth := runewidth.RuneWidth(ch) + if chWidth == 0 { + continue + } + + // Skip to the right. + if !t.wrap && skipped < skip { + skipped += chWidth + continue + } + + // Stop at the right border. + if posX+chWidth > width { + break + } + + // Do we highlight this character? + style := tcell.StyleDefault.Background(t.backgroundColor).Foreground(color) + if len(regionID) > 0 { + if _, ok := t.highlights[regionID]; ok { + style = tcell.StyleDefault.Background(color).Foreground(t.backgroundColor) + } + } + + // Draw the character. + for offset := 0; offset < chWidth; offset++ { + screen.SetContent(x+posX+offset, y+line-t.lineOffset, ch, nil, style) + } + + // Advance. + posX += chWidth + } + } + + // If this view is not scrollable, we'll purge the buffer of lines that have + // scrolled out of view. + if !t.scrollable && t.lineOffset > 0 { + t.buffer = t.buffer[t.index[t.lineOffset].Line:] + t.index = nil + } +} + +// InputHandler returns the handler for this primitive. +func (t *TextView) InputHandler() func(event *tcell.EventKey, setFocus func(p Primitive)) { + return t.WrapInputHandler(func(event *tcell.EventKey, setFocus func(p Primitive)) { + key := event.Key() + + if key == tcell.KeyEscape || key == tcell.KeyEnter || key == tcell.KeyTab || key == tcell.KeyBacktab { + if t.done != nil { + t.done(key) + } + return + } + + if !t.scrollable { + return + } + + switch key { + case tcell.KeyRune: + switch event.Rune() { + case 'g': // Home. + t.trackEnd = false + t.lineOffset = 0 + t.columnOffset = 0 + case 'G': // End. + t.trackEnd = true + t.columnOffset = 0 + case 'j': // Down. + t.lineOffset++ + case 'k': // Up. + t.trackEnd = false + t.lineOffset-- + case 'h': // Left. + t.columnOffset-- + case 'l': // Right. + t.columnOffset++ + } + case tcell.KeyHome: + t.trackEnd = false + t.lineOffset = 0 + t.columnOffset = 0 + case tcell.KeyEnd: + t.trackEnd = true + t.columnOffset = 0 + case tcell.KeyUp: + t.trackEnd = false + t.lineOffset-- + case tcell.KeyDown: + t.lineOffset++ + case tcell.KeyLeft: + t.columnOffset-- + case tcell.KeyRight: + t.columnOffset++ + case tcell.KeyPgDn, tcell.KeyCtrlF: + t.lineOffset += t.pageSize + case tcell.KeyPgUp, tcell.KeyCtrlB: + t.trackEnd = false + t.lineOffset -= t.pageSize + } + }) +} |