mirror of https://github.com/rivo/tview.git
748 lines
20 KiB
Go
748 lines
20 KiB
Go
package tview
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import (
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"bytes"
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"math"
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"regexp"
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"sync"
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"unicode/utf8"
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"github.com/gdamore/tcell"
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)
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// textColors maps color strings which may be embedded in text sent to a
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// TextView to their tcell counterparts.
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var textColors = map[string]tcell.Color{
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"red": tcell.ColorRed,
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"white": tcell.ColorWhite,
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"yellow": tcell.ColorYellow,
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"blue": tcell.ColorBlue,
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"green": tcell.ColorGreen,
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"cyan": tcell.ColorDarkCyan,
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"magenta": tcell.ColorDarkMagenta,
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}
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// Regular expressions commonly used throughout the TextView class.
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var (
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colorPattern *regexp.Regexp // Initialized in the init() function.
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regionPattern = regexp.MustCompile(`\["([a-zA-Z0-9_,;: \-\.]*)"\]`)
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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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type textViewIndex struct {
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Line int // The index into the "buffer" variable.
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Pos int // The index into the "buffer" string.
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Color tcell.Color // The starting color.
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Region string // The starting region ID.
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}
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// TextView is a box which displays text. It implements the io.Writer interface
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// so you can stream text to it. This does not trigger a redraw automatically
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// but if a handler is installed via SetChangedFunc(), you can cause it to be
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// redrawn.
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//
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// Navigation
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//
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// If the text view is scrollable (the default), text is kept in a buffer which
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// may be larger than the screen and can be navigated similarly to Vim:
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//
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// - h, left arrow: Move left.
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// - l, right arrow: Move right.
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// - j, down arrow: Move down.
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// - k, up arrow: Move up.
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// - g, home: Move to the top.
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// - G, end: Move to the bottom.
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// - Ctrl-F, page down: Move down by one page.
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// - Ctrl-B, page up: Move up by one page.
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//
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// If the text is not scrollable, any text above the top visible line is
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// discarded.
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//
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// Navigation can be intercepted by installing a callback function via
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// SetCaptureFunc() which receives all keyboard events and decides which ones
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// to forward to the default handler.
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//
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// Colors
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//
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// If dynamic colors are enabled via SetDynamicColors(), text color can be
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// changed dynamically by embedding color strings in square brackets. For
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// example,
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//
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// This is a [red]warning[white]!
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//
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// will print the word "warning" in red. The following colors are currently
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// supported: white, yellow, blue, green, red, cyan, magenta.
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//
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// Regions and Highlights
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//
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// If regions are enabled via SetRegions(), you can define text regions within
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// the text and assign region IDs to them. Text regions start with region tags.
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// Region tags are square brackets that contain a region ID in double quotes,
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// for example:
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//
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// We define a ["rg"]region[""] here.
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//
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// A text region ends with the next region tag. Tags with no region ID ([""])
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// don't start new regions. They can therefore be used to mark the end of a
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// region. Region IDs must satisfy the following regular expression:
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//
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// [a-zA-Z0-9_,;: \-\.]+
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//
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// Regions can be highlighted by calling the Highlight() function with one or
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// more region IDs. This can be used to display search results, for example.
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//
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// The ScrollToHighlight() function can be used to jump to the currently
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// highlighted region once when the text view is drawn the next time.
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type TextView struct {
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sync.Mutex
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*Box
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// The text buffer.
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buffer []string
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// The last bytes that have been received but are not part of the buffer yet.
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recentBytes []byte
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// The processed line index. This is nil if the buffer has changed and needs
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// to be re-indexed.
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index []*textViewIndex
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// Indices into the "index" slice which correspond to the first line of the
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// first highlight and the last line of the last highlight. This is calculated
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// during re-indexing. Set to -1 if there is no current highlight.
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fromHighlight, toHighlight int
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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 display width for which the index is created.
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indexWidth int
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// The width of the longest line in the index (not the buffer).
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longestLine int
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// The index of the first line shown in the text view.
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lineOffset int
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// If set to true, the text view will always remain at the end of the content.
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trackEnd bool
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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 height of the content the last time the text view was drawn.
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pageSize int
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// If set to true, the text view will keep a buffer of text which can be
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// navigated when the text is longer than what fits into the box.
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scrollable bool
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// If set to true, lines that are longer than the available width are wrapped
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// onto the next line. If set to false, any characters beyond the available
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// width are discarded.
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wrap bool
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// The (starting) color of the text.
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textColor tcell.Color
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// If set to true, the text color can be changed dynamically by piping color
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// strings in square brackets to the text view.
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dynamicColors bool
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// If set to true, region tags can be used to define regions.
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regions bool
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// A temporary flag which, when true, will automatically bring the current
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// highlight(s) into the visible screen.
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scrollToHighlights bool
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// An optional function which will receive all key events sent to this text
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// view. Returning true also invokes the default key handling.
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capture func(*tcell.EventKey) bool
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// An optional function which is called when the content of the text view has
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// changed.
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changed func()
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// An optional function which is called when the user presses one of the
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// following keys: Escape, Enter, Tab, Backtab.
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done func(tcell.Key)
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}
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// NewTextView returns a new text view.
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func NewTextView() *TextView {
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return &TextView{
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Box: NewBox(),
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highlights: make(map[string]struct{}),
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lineOffset: -1,
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scrollable: true,
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wrap: true,
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textColor: tcell.ColorWhite,
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dynamicColors: false,
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}
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}
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// SetScrollable sets the flag that decides whether or not the text view is
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// scollable. If true, text is kept in a buffer and can be navigated.
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func (t *TextView) SetScrollable(scrollable bool) *TextView {
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t.scrollable = scrollable
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if !scrollable {
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t.trackEnd = true
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}
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return t
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}
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// SetWrap sets the flag that, if true, leads to lines that are longer than the
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// available width being wrapped onto the next line. If false, any characters
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// beyond the available width are not displayed.
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func (t *TextView) SetWrap(wrap bool) *TextView {
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if t.wrap != wrap {
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t.index = nil
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}
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t.wrap = wrap
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return t
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}
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// SetTextColor sets the initial color of the text (which can be changed
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// dynamically by sending color strings in square brackets to the text view if
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// dynamic colors are enabled).
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func (t *TextView) SetTextColor(color tcell.Color) *TextView {
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t.textColor = color
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return t
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}
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// SetDynamicColors sets the flag that allows the text color to be changed
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// dynamically. See class description for details.
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func (t *TextView) SetDynamicColors(dynamic bool) *TextView {
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if t.dynamicColors != dynamic {
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t.index = nil
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}
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t.dynamicColors = dynamic
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return t
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}
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// SetRegions sets the flag that allows to define regions in the text. See class
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// description for details.
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func (t *TextView) SetRegions(regions bool) *TextView {
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t.regions = regions
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return t
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}
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// SetCaptureFunc sets a handler which is called whenever a key is pressed.
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// This allows you to override the default key handling of the text view.
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// Returning true will allow the default key handling to go forward after the
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// handler returns. Returning false will disable any default key handling.
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func (t *TextView) SetCaptureFunc(handler func(event *tcell.EventKey) bool) *TextView {
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t.capture = handler
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return t
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}
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// SetChangedFunc sets a handler function which is called when the text of the
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// text view has changed. This is typically used to cause the application to
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// redraw the screen.
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func (t *TextView) SetChangedFunc(handler func()) *TextView {
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t.changed = handler
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return t
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}
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// SetDoneFunc sets a handler which is called when the user presses on the
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// following keys: Escape, Enter, Tab, Backtab. The key is passed to the
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// handler.
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func (t *TextView) SetDoneFunc(handler func(key tcell.Key)) *TextView {
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t.done = handler
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return t
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}
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// Clear removes all text from the buffer.
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func (t *TextView) Clear() *TextView {
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t.buffer = nil
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t.recentBytes = nil
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t.index = nil
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return t
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}
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// Highlight specifies which regions should be highlighted. See class
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// description for details on regions. Empty region strings are ignored.
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//
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// Text in highlighted regions will be drawn inverted, i.e. with their
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// background and foreground colors swapped.
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//
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// Calling this function will remove any previous highlights. To remove all
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// highlights, call this function without any arguments.
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func (t *TextView) Highlight(regionIDs ...string) *TextView {
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t.highlights = make(map[string]struct{})
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for _, id := range regionIDs {
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if id == "" {
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continue
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}
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t.highlights[id] = struct{}{}
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}
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return t
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}
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// GetHighlights returns the IDs of all currently highlighted regions.
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func (t *TextView) GetHighlights() (regionIDs []string) {
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for id := range t.highlights {
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regionIDs = append(regionIDs, id)
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}
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return
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}
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// ScrollToHighlight will cause the visible area to be scrolled so that the
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// highlighted regions appear in the visible area of the text view. This
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// repositioning happens the next time the text view is drawn. It happens only
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// once so you will need to call this function repeatedly to always keep
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// highlighted regions in view.
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//
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// Nothing happens if there are no highlighted regions or if the text view is
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// not scrollable.
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func (t *TextView) ScrollToHighlight() *TextView {
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if len(t.highlights) == 0 || !t.scrollable || !t.regions {
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return t
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}
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t.index = nil
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t.scrollToHighlights = true
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t.trackEnd = false
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return t
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}
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// GetRegionText returns the text of the region with the given ID. If dynamic
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// colors are enabled, color tags are stripped from the text. Newlines are
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// always returned as '\n' runes.
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//
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// If the region does not exist or if regions are turned off, an empty string
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// is returned.
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func (t *TextView) GetRegionText(regionID string) string {
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if !t.regions || regionID == "" {
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return ""
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}
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var (
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buffer bytes.Buffer
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currentRegionID string
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)
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for _, str := range t.buffer {
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// Find all color tags in this line.
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var colorTagIndices [][]int
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if t.dynamicColors {
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colorTagIndices = colorPattern.FindAllStringIndex(str, -1)
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}
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// Find all regions in this line.
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var (
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regionIndices [][]int
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regions [][]string
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)
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if t.regions {
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regionIndices = regionPattern.FindAllStringIndex(str, -1)
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regions = regionPattern.FindAllStringSubmatch(str, -1)
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}
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// Analyze this line.
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var currentTag, currentRegion int
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for pos, ch := range str {
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// Skip any color tags.
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if currentTag < len(colorTagIndices) && pos >= colorTagIndices[currentTag][0] && pos < colorTagIndices[currentTag][1] {
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if pos == colorTagIndices[currentTag][1]-1 {
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currentTag++
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}
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continue
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}
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// Skip any regions.
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if currentRegion < len(regionIndices) && pos >= regionIndices[currentRegion][0] && pos < regionIndices[currentRegion][1] {
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if pos == regionIndices[currentRegion][1]-1 {
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if currentRegionID == regionID {
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// This is the end of the requested region. We're done.
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return buffer.String()
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}
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currentRegionID = regions[currentRegion][1]
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currentRegion++
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}
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continue
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}
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// Add this rune.
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if currentRegionID == regionID {
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buffer.WriteRune(ch)
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}
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}
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// Add newline.
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if currentRegionID == regionID {
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buffer.WriteRune('\n')
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}
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}
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return buffer.String()
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}
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// Write lets us implement the io.Writer interface.
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func (t *TextView) Write(p []byte) (n int, err error) {
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// Notify at the end.
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if t.changed != nil {
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defer t.changed()
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}
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t.Lock()
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defer t.Unlock()
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// Copy data over.
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newBytes := append(t.recentBytes, p...)
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t.recentBytes = nil
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// If we have a trailing invalid UTF-8 byte, we'll wait.
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if r, _ := utf8.DecodeLastRune(p); r == utf8.RuneError {
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t.recentBytes = newBytes
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return len(p), nil
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}
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// If we have a trailing open dynamic color, exclude it.
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if t.dynamicColors {
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openColor := regexp.MustCompile(`\[[a-z]+$`)
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location := openColor.FindIndex(newBytes)
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if location != nil {
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t.recentBytes = newBytes[location[0]:]
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newBytes = newBytes[:location[0]]
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}
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}
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// Transform the new bytes into strings.
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newLine := regexp.MustCompile(`\r?\n`)
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for index, line := range newLine.Split(string(newBytes), -1) {
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if index == 0 {
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if len(t.buffer) == 0 {
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t.buffer = []string{line}
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} else {
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t.buffer[len(t.buffer)-1] += line
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}
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} else {
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t.buffer = append(t.buffer, line)
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}
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}
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// Reset the index.
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t.index = nil
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return len(p), nil
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}
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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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func (t *TextView) reindexBuffer(width int) {
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if t.index != nil && width == t.indexWidth {
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return // Nothing has changed. We can still use the current index.
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}
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t.index = nil
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t.fromHighlight, t.toHighlight = -1, -1
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var (
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regionID string
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highlighted bool
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)
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t.longestLine = 0
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color := t.textColor
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if !t.wrap {
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width = math.MaxInt64
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}
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for index, str := range t.buffer {
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// Find all color tags in this line.
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var (
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colorTagIndices [][]int
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colorTags [][]string
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)
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if t.dynamicColors {
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colorTagIndices = colorPattern.FindAllStringIndex(str, -1)
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colorTags = colorPattern.FindAllStringSubmatch(str, -1)
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}
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// Find all regions in this line.
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var (
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regionIndices [][]int
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regions [][]string
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)
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if t.regions {
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regionIndices = regionPattern.FindAllStringIndex(str, -1)
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regions = regionPattern.FindAllStringSubmatch(str, -1)
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}
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// We also keep a reference to empty lines.
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if len(str) == 0 {
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t.index = append(t.index, &textViewIndex{
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Line: index,
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Pos: 0,
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Color: color,
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Region: regionID,
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})
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}
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|
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// Break down the line.
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var currentTag, currentRegion, currentWidth int
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for pos := range str {
|
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// Skip any color tags.
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if currentTag < len(colorTags) && pos >= colorTagIndices[currentTag][0] && pos < colorTagIndices[currentTag][1] {
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if pos == colorTagIndices[currentTag][1]-1 {
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color = textColors[colorTags[currentTag][1]]
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currentTag++
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}
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continue
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}
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|
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// Check regions.
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if currentRegion < len(regionIndices) && pos >= regionIndices[currentRegion][0] && pos < regionIndices[currentRegion][1] {
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if pos == regionIndices[currentRegion][1]-1 {
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// We're done with this region.
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regionID = regions[currentRegion][1]
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|
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// Is this region highlighted?
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_, highlighted = t.highlights[regionID]
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currentRegion++
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}
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continue
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}
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|
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// Add this line.
|
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if currentWidth == 0 {
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t.index = append(t.index, &textViewIndex{
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Line: index,
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Pos: pos,
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Color: color,
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Region: regionID,
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})
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}
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|
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// Update highlight range.
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if highlighted {
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line := len(t.index) - 1
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if t.fromHighlight < 0 {
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t.fromHighlight, t.toHighlight = line, line
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} else if line > t.toHighlight {
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t.toHighlight = line
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}
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}
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// Proceed.
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currentWidth++
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|
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// Have we crossed the width?
|
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if t.wrap && currentWidth >= width {
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currentWidth = 0
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}
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|
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// Do we have a new maximum width?
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if currentWidth > t.longestLine {
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t.longestLine = currentWidth
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}
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}
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}
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t.indexWidth = width
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}
|
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|
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// Draw draws this primitive onto the screen.
|
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func (t *TextView) Draw(screen tcell.Screen) {
|
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t.Lock()
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defer t.Unlock()
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t.Box.Draw(screen)
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|
|
// Get the available size.
|
|
x, y, width, height := t.GetInnerRect()
|
|
t.pageSize = height
|
|
|
|
// Re-index.
|
|
t.reindexBuffer(width)
|
|
|
|
// 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.columnOffset+width > t.longestLine {
|
|
t.columnOffset = t.longestLine - width
|
|
}
|
|
if t.columnOffset < 0 {
|
|
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:]
|
|
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)
|
|
}
|
|
|
|
// Print one line.
|
|
var currentTag, currentRegion, skip, posX 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 = textColors[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 to the right.
|
|
if !t.wrap && skip < t.columnOffset {
|
|
skip++
|
|
continue
|
|
}
|
|
|
|
// Stop at the right border.
|
|
if posX >= 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.
|
|
screen.SetContent(x+posX, y+line-t.lineOffset, ch, nil, style)
|
|
|
|
// Advance.
|
|
posX++
|
|
}
|
|
}
|
|
|
|
// 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 func(event *tcell.EventKey, setFocus func(p Primitive)) {
|
|
// Do we pass this event on?
|
|
if t.capture != nil {
|
|
if !t.capture(event) {
|
|
return
|
|
}
|
|
}
|
|
|
|
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
|
|
}
|
|
}
|
|
}
|