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Diffstat (limited to 'vendor/maunium.net/go/tview/textview.go')
| -rw-r--r-- | vendor/maunium.net/go/tview/textview.go | 1018 |
1 files changed, 0 insertions, 1018 deletions
diff --git a/vendor/maunium.net/go/tview/textview.go b/vendor/maunium.net/go/tview/textview.go deleted file mode 100644 index 63d9796..0000000 --- a/vendor/maunium.net/go/tview/textview.go +++ /dev/null @@ -1,1018 +0,0 @@ -package tview - -import ( - "bytes" - "fmt" - "regexp" - "sync" - "unicode/utf8" - - "maunium.net/go/tcell" - "github.com/lucasb-eyer/go-colorful" - 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. - ForegroundColor string // The starting foreground color ("" = don't change, "-" = reset). - BackgroundColor string // The starting background color ("" = don't change, "-" = reset). - Attributes string // The starting attributes ("" = don't change, "-" = reset). - 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. (See SetChangedFunc() for more details.) -// -// 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 - - // The screen space column of the highlight in its first line. Set to -1 if - // there is no current highlight. - posHighlight 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, - regions: false, - 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 useful when text is written to this io.Writer -// in a separate goroutine. This does not automatically cause the screen to be -// refreshed so you may want to use the "changed" handler to redraw the screen. -// -// Note that to avoid race conditions or deadlocks, there are a few rules you -// should follow: -// -// - You can call Application.Draw() from this handler. -// - You can call TextView.HasFocus() from this handler. -// - During the execution of this handler, access to any other variables from -// this primitive or any other primitive should be queued using -// Application.QueueUpdate(). -// -// See package description for details on dealing with concurrency. -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 -} - -// ScrollTo scrolls to the specified row and column (both starting with 0). -func (t *TextView) ScrollTo(row, column int) *TextView { - if !t.scrollable { - return t - } - t.lineOffset = row - t.columnOffset = column - 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 -} - -// GetScrollOffset returns the number of rows and columns that are skipped at -// the top left corner when the text view has been scrolled. -func (t *TextView) GetScrollOffset() (row, column int) { - return t.lineOffset, t.columnOffset -} - -// 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]`) -} - -// Focus is called when this primitive receives focus. -func (t *TextView) Focus(delegate func(p Primitive)) { - // Implemented here with locking because this is used by layout primitives. - t.Lock() - defer t.Unlock() - t.hasFocus = true -} - -// HasFocus returns whether or not this primitive has focus. -func (t *TextView) HasFocus() bool { - // Implemented here with locking because this may be used in the "changed" - // callback. - t.Lock() - defer t.Unlock() - return t.hasFocus -} - -// 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. - t.Lock() - changed := t.changed - t.Unlock() - if changed != nil { - defer changed() // Deadlocks may occur if we lock here. - } - - 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, t.posHighlight = -1, -1, -1 - - // If there's no space, there's no index. - if width < 1 { - return - } - - // Initial states. - regionID := "" - var highlighted bool - - // 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 - escapeIndices [][]int - ) - strippedStr := str - if t.dynamicColors { - colorTagIndices, colorTags, escapeIndices, strippedStr, _ = decomposeString(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) - strippedStr = regionPattern.ReplaceAllString(strippedStr, "") - } - - // We don't need the original string anymore for now. - str = strippedStr - - // 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 - foregroundColor, backgroundColor, attributes string - ) - for _, splitLine := range splitLines { - line := &textViewIndex{ - Line: bufferIndex, - Pos: originalPos, - ForegroundColor: foregroundColor, - BackgroundColor: backgroundColor, - Attributes: attributes, - Region: regionID, - } - - // Shift original position with tags. - lineLength := len(splitLine) - remainingLength := lineLength - tagEnd := originalPos - totalTagLength := 0 - for { - // Which tag comes next? - nextTag := make([][3]int, 0, 3) - if colorPos < len(colorTagIndices) { - nextTag = append(nextTag, [3]int{colorTagIndices[colorPos][0], colorTagIndices[colorPos][1], 0}) // 0 = color tag. - } - if regionPos < len(regionIndices) { - nextTag = append(nextTag, [3]int{regionIndices[regionPos][0], regionIndices[regionPos][1], 1}) // 1 = region tag. - } - if escapePos < len(escapeIndices) { - nextTag = append(nextTag, [3]int{escapeIndices[escapePos][0], escapeIndices[escapePos][1], 2}) // 2 = escape tag. - } - minPos := -1 - tagIndex := -1 - for index, pair := range nextTag { - if minPos < 0 || pair[0] < minPos { - minPos = pair[0] - tagIndex = index - } - } - - // Is the next tag in range? - if tagIndex < 0 || minPos >= tagEnd+remainingLength { - break // No. We're done with this line. - } - - // Advance. - strippedTagStart := nextTag[tagIndex][0] - originalPos - totalTagLength - tagEnd = nextTag[tagIndex][1] - tagLength := tagEnd - nextTag[tagIndex][0] - if nextTag[tagIndex][2] == 2 { - tagLength = 1 - } - totalTagLength += tagLength - remainingLength = lineLength - (tagEnd - originalPos - totalTagLength) - - // Process the tag. - switch nextTag[tagIndex][2] { - case 0: - // Process color tags. - foregroundColor, backgroundColor, attributes = styleFromTag(foregroundColor, backgroundColor, attributes, colorTags[colorPos]) - colorPos++ - case 1: - // Process region tags. - 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 - t.posHighlight = runewidth.StringWidth(splitLine[:strippedTagStart]) - } else if line > t.toHighlight { - t.toHighlight = line - } - } - - regionPos++ - case 2: - // Process escape tags. - escapePos++ - } - } - - // Advance to next line. - originalPos += lineLength + totalTagLength - - // 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.wrap { - 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 - } - - // If the highlight is too far to the right, move it to the middle. - if t.posHighlight-t.columnOffset > 3*width/4 { - t.columnOffset = t.posHighlight - width/2 - } - - // If the highlight is off-screen on the left, move it on-screen. - if t.posHighlight-t.columnOffset < 0 { - t.columnOffset = t.posHighlight - width/4 - } - } - 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. - defaultStyle := tcell.StyleDefault.Foreground(t.textColor) - 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] - foregroundColor := index.ForegroundColor - backgroundColor := index.BackgroundColor - attributes := index.Attributes - regionID := index.Region - - // Get color tags. - var ( - colorTagIndices [][]int - colorTags [][]string - escapeIndices [][]int - ) - strippedText := text - if t.dynamicColors { - colorTagIndices, colorTags, escapeIndices, strippedText, _ = decomposeString(text) - } - - // Get regions. - var ( - regionIndices [][]int - regions [][]string - ) - if t.regions { - regionIndices = regionPattern.FindAllStringIndex(text, -1) - regions = regionPattern.FindAllStringSubmatch(text, -1) - strippedText = regionPattern.ReplaceAllString(strippedText, "") - if !t.dynamicColors { - escapeIndices = escapePattern.FindAllStringIndex(text, -1) - strippedText = string(escapePattern.ReplaceAllString(strippedText, "[$1$2]")) - } - } - - // 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 colorPos, regionPos, escapePos, tagOffset, skipped int - iterateString(strippedText, func(main rune, comb []rune, textPos, textWidth, screenPos, screenWidth int) bool { - // Process tags. - for { - if colorPos < len(colorTags) && textPos+tagOffset >= colorTagIndices[colorPos][0] && textPos+tagOffset < colorTagIndices[colorPos][1] { - // Get the color. - foregroundColor, backgroundColor, attributes = styleFromTag(foregroundColor, backgroundColor, attributes, colorTags[colorPos]) - tagOffset += colorTagIndices[colorPos][1] - colorTagIndices[colorPos][0] - colorPos++ - } else if regionPos < len(regionIndices) && textPos+tagOffset >= regionIndices[regionPos][0] && textPos+tagOffset < regionIndices[regionPos][1] { - // Get the region. - regionID = regions[regionPos][1] - tagOffset += regionIndices[regionPos][1] - regionIndices[regionPos][0] - regionPos++ - } else { - break - } - } - - // Skip the second-to-last character of an escape tag. - if escapePos < len(escapeIndices) && textPos+tagOffset == escapeIndices[escapePos][1]-2 { - tagOffset++ - escapePos++ - } - - // Mix the existing style with the new style. - _, _, existingStyle, _ := screen.GetContent(x+posX, y+line-t.lineOffset) - _, background, _ := existingStyle.Decompose() - style := overlayStyle(background, defaultStyle, foregroundColor, backgroundColor, attributes) - - // Do we highlight this character? - var highlighted bool - if len(regionID) > 0 { - if _, ok := t.highlights[regionID]; ok { - highlighted = true - } - } - if highlighted { - fg, bg, _ := style.Decompose() - if bg == tcell.ColorDefault { - r, g, b := fg.RGB() - c := colorful.Color{R: float64(r) / 255, G: float64(g) / 255, B: float64(b) / 255} - _, _, li := c.Hcl() - if li < .5 { - bg = tcell.ColorWhite - } else { - bg = tcell.ColorBlack - } - } - style = style.Background(fg).Foreground(bg) - } - - // Skip to the right. - if !t.wrap && skipped < skip { - skipped += screenWidth - return false - } - - // Stop at the right border. - if posX+screenWidth > width { - return true - } - - // Draw the character. - for offset := screenWidth - 1; offset >= 0; offset-- { - if offset == 0 { - screen.SetContent(x+posX+offset, y+line-t.lineOffset, main, comb, style) - } else { - screen.SetContent(x+posX+offset, y+line-t.lineOffset, ' ', nil, style) - } - } - - // Advance. - posX += screenWidth - return false - }) - } - - // 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 - } - }) -} |