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@ -23,12 +23,11 @@ var (
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TabSize = 4
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)
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// textViewIndex contains information about each line displayed in the text
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// view.
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// textViewIndex contains information about a line displayed in the text view.
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type textViewIndex struct {
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Line int // The index into the "buffer" variable.
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Line int // The index into the "buffer" slice.
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Pos int // The index into the "buffer" string (byte position).
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NextPos int // The (byte) index of the next character in this buffer line.
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NextPos int // The (byte) index of the next line start within this buffer string.
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Width int // The screen width of this line.
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ForegroundColor string // The starting foreground color ("" = don't change, "-" = reset).
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BackgroundColor string // The starting background color ("" = don't change, "-" = reset).
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@ -131,7 +130,7 @@ type TextView struct {
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// A set of region IDs that are currently highlighted.
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highlights map[string]struct{}
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// The last width for which the current table is drawn.
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// The last width for which the current text view is drawn.
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lastWidth int
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// The screen width of the longest line in the index (not the buffer).
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@ -146,6 +145,10 @@ type TextView struct {
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// The number of characters to be skipped on each line (not in wrap mode).
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columnOffset int
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// The maximum number of lines kept in the line index, effectively the
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// latest word-wrapped lines. Ignored if 0.
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maxLines int
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// The height of the content the last time the text view was drawn.
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pageSize int
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@ -243,6 +246,20 @@ func (t *TextView) SetWordWrap(wrapOnWords bool) *TextView {
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return t
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}
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// SetMaxLines sets the maximum number of lines for this text view. Lines at the
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// beginning of the text will be discarded when the text view is drawn, so as to
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// remain below this value. Broken lines via word wrapping are counted
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// individually.
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//
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// Note that GetText() will return the shortened text and may start with color
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// and/or region tags that were open at the cutoff point.
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//
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// A value of 0 (the default) will keep all lines in place.
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func (t *TextView) SetMaxLines(maxLines int) *TextView {
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t.maxLines = maxLines
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return t
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}
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// SetTextAlign sets the text alignment within the text view. This must be
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// either AlignLeft, AlignCenter, or AlignRight.
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func (t *TextView) SetTextAlign(align int) *TextView {
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@ -671,7 +688,10 @@ func (t *TextView) Write(p []byte) (n int, err error) {
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// reindexBuffer re-indexes the buffer such that we can use it to easily draw
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// the buffer onto the screen. Each line in the index will contain a pointer
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// into the buffer from which on we will print text. It will also contain the
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// color with which the line starts.
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// colors, attributes, and region with which the line starts.
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//
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// If maxLines is greater than 0, any extra lines will be dropped from the
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// buffer.
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func (t *TextView) reindexBuffer(width int) {
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if t.index != nil {
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return // Nothing has changed. We can still use the current index.
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@ -834,6 +854,56 @@ func (t *TextView) reindexBuffer(width int) {
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}
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}
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// Drop lines beyond maxLines.
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if t.maxLines > 0 && len(t.index) > t.maxLines {
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removedLines := len(t.index) - t.maxLines
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// Adjust the index.
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t.index = t.index[removedLines:]
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if t.fromHighlight >= 0 {
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t.fromHighlight -= removedLines
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if t.fromHighlight < 0 {
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t.fromHighlight = 0
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}
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}
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if t.toHighlight >= 0 {
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t.toHighlight -= removedLines
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if t.toHighlight < 0 {
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t.fromHighlight, t.toHighlight, t.posHighlight = -1, -1, -1
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}
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}
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bufferShift := t.index[0].Line
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for _, line := range t.index {
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line.Line -= bufferShift
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}
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// Adjust the original buffer.
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t.buffer = t.buffer[bufferShift:]
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var prefix string
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if t.index[0].ForegroundColor != "" || t.index[0].BackgroundColor != "" || t.index[0].Attributes != "" {
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prefix = fmt.Sprintf("[%s:%s:%s]", t.index[0].ForegroundColor, t.index[0].BackgroundColor, t.index[0].Attributes)
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}
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if t.index[0].Region != "" {
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prefix += fmt.Sprintf("[%s]", t.index[0].Region)
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}
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posShift := t.index[0].Pos
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t.buffer[0] = prefix + t.buffer[0][posShift:]
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t.lineOffset -= removedLines
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if t.lineOffset < 0 {
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t.lineOffset = 0
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}
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// Adjust positions of first buffer line.
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posShift -= len(prefix)
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for _, line := range t.index {
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if line.Line != 0 {
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break
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}
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line.Pos -= posShift
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line.NextPos -= posShift
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}
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}
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// Calculate longest line.
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t.longestLine = 0
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for _, line := range t.index {
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Oliver
3 years ago