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This supports now curly, double, dashed, and dotted underline styles where trhe terminal supports it. This works well on Windows Terminal, reasonably on iTerm2, Alacritty, Kitty, and probably others. The wasm mode terminal includes support for this, dependent on the browser capabilities. The macOS Terminal just changes the background color. Legacy Windows console does nothing. We will try to provide a regular underscore as a fallback. A new style.go demo is included to see some style combinations.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,214 @@ | ||
| //go:build ignore | ||
| // +build ignore | ||
|
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| // Copyright 2019 The TCell Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use file except in compliance with the License. | ||
| // You may obtain a copy of the license at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
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| // unicode just displays a Unicode test on your screen. | ||
| // Press ESC to exit the program. | ||
| package main | ||
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| import ( | ||
| "fmt" | ||
| "os" | ||
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| "github.com/gdamore/tcell/v2" | ||
| "github.com/gdamore/tcell/v2/encoding" | ||
| runewidth "github.com/mattn/go-runewidth" | ||
| ) | ||
|
|
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| var row = 0 | ||
| var style = tcell.StyleDefault | ||
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| func putln(s tcell.Screen, str string) { | ||
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| puts(s, style, 1, row, str) | ||
| row++ | ||
| } | ||
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| func puts(s tcell.Screen, style tcell.Style, x, y int, str string) { | ||
| i := 0 | ||
| var deferred []rune | ||
| dwidth := 0 | ||
| zwj := false | ||
| for _, r := range str { | ||
| if r == '\u200d' { | ||
| if len(deferred) == 0 { | ||
| deferred = append(deferred, ' ') | ||
| dwidth = 1 | ||
| } | ||
| deferred = append(deferred, r) | ||
| zwj = true | ||
| continue | ||
| } | ||
| if zwj { | ||
| deferred = append(deferred, r) | ||
| zwj = false | ||
| continue | ||
| } | ||
| switch runewidth.RuneWidth(r) { | ||
| case 0: | ||
| if len(deferred) == 0 { | ||
| deferred = append(deferred, ' ') | ||
| dwidth = 1 | ||
| } | ||
| case 1: | ||
| if len(deferred) != 0 { | ||
| s.SetContent(x+i, y, deferred[0], deferred[1:], style) | ||
| i += dwidth | ||
| } | ||
| deferred = nil | ||
| dwidth = 1 | ||
| case 2: | ||
| if len(deferred) != 0 { | ||
| s.SetContent(x+i, y, deferred[0], deferred[1:], style) | ||
| i += dwidth | ||
| } | ||
| deferred = nil | ||
| dwidth = 2 | ||
| } | ||
| deferred = append(deferred, r) | ||
| } | ||
| if len(deferred) != 0 { | ||
| s.SetContent(x+i, y, deferred[0], deferred[1:], style) | ||
| i += dwidth | ||
| } | ||
| } | ||
|
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| func main() { | ||
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| s, e := tcell.NewScreen() | ||
| if e != nil { | ||
| fmt.Fprintf(os.Stderr, "%v\n", e) | ||
| os.Exit(1) | ||
| } | ||
|
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| encoding.Register() | ||
|
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| if e = s.Init(); e != nil { | ||
| fmt.Fprintf(os.Stderr, "%v\n", e) | ||
| os.Exit(1) | ||
| } | ||
|
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| plain := tcell.StyleDefault | ||
| bold := style.Bold(true) | ||
|
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| s.SetStyle(tcell.StyleDefault. | ||
| Foreground(tcell.ColorBlack). | ||
| Background(tcell.ColorWhite)) | ||
| s.Clear() | ||
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| quit := make(chan struct{}) | ||
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| style = bold.Foreground(tcell.ColorBlue).Background(tcell.ColorSilver) | ||
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| row = 2 | ||
| puts(s, style, 2, row, "Press ESC to Exit") | ||
| row = 4 | ||
| puts(s, plain, 2, row, "Note: Style support is dependent on your terminal.") | ||
| row = 6 | ||
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| plain = tcell.StyleDefault.Foreground(tcell.ColorBlack).Background(tcell.ColorWhite) | ||
|
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| style = plain | ||
| puts(s, style, 2, row, "Plain") | ||
| row++ | ||
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| style = plain.Blink(true) | ||
| puts(s, style, 2, row, "Blink") | ||
| row++ | ||
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| style = plain.Reverse(true) | ||
| puts(s, style, 2, row, "Reverse") | ||
| row++ | ||
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| style = plain.Dim(true) | ||
| puts(s, style, 2, row, "Dim") | ||
| row++ | ||
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| style = plain.Underline(true) | ||
| puts(s, style, 2, row, "Underline") | ||
| row++ | ||
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| style = plain.Italic(true) | ||
| puts(s, style, 2, row, "Italic") | ||
| row++ | ||
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| style = plain.Bold(true) | ||
| puts(s, style, 2, row, "Bold") | ||
| row++ | ||
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| style = plain.Bold(true).Italic(true) | ||
| puts(s, style, 2, row, "Bold Italic") | ||
| row++ | ||
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| style = plain.Bold(true).Italic(true).Underline(true) | ||
| puts(s, style, 2, row, "Bold Italic Underline") | ||
| row++ | ||
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| style = plain.StrikeThrough(true) | ||
| puts(s, style, 2, row, "Strikethrough") | ||
| row++ | ||
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| style = plain.DoubleUnderline(true) | ||
| puts(s, style, 2, row, "Double Underline") | ||
| row++ | ||
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| style = plain.CurlyUnderline(true) | ||
| puts(s, style, 2, row, "Curly Underline") | ||
| row++ | ||
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| style = plain.DottedUnderline(true) | ||
| puts(s, style, 2, row, "Dotted Underline") | ||
| row++ | ||
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| style = plain.DashedUnderline(true) | ||
| puts(s, style, 2, row, "Dashed Underline") | ||
| row++ | ||
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| style = plain.Url("http://github.com/gdamore/tcell") | ||
| puts(s, style, 2, row, "HyperLink") | ||
| row++ | ||
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| style = plain.Foreground(tcell.ColorRed) | ||
| puts(s, style, 2, row, "Red Foreground") | ||
| row++ | ||
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| style = plain.Background(tcell.ColorRed) | ||
| puts(s, style, 2, row, "Red Background") | ||
| row++ | ||
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| s.Show() | ||
| go func() { | ||
| for { | ||
| ev := s.PollEvent() | ||
| switch ev := ev.(type) { | ||
| case *tcell.EventKey: | ||
| switch ev.Key() { | ||
| case tcell.KeyEscape, tcell.KeyEnter: | ||
| close(quit) | ||
| return | ||
| case tcell.KeyCtrlL: | ||
| s.Sync() | ||
| } | ||
| case *tcell.EventResize: | ||
| s.Sync() | ||
| } | ||
| } | ||
| }() | ||
|
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| <-quit | ||
|
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| s.Fini() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -66,5 +66,6 @@ func init() { | |
| KeyF19: "\x1b[33~", | ||
| KeyF20: "\x1b[34~", | ||
| AutoMargin: true, | ||
| XTermLike: true, | ||
| }) | ||
| } | ||
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