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cmd/flatend: initial exploration on tui
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,198 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "github.com/gdamore/tcell" | ||
| "github.com/gdamore/tcell/encoding" | ||
| "github.com/mattn/go-runewidth" | ||
| ) | ||
|
|
||
| func check(err error) { | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| } | ||
|
|
||
| func text(s tcell.Screen, x, y int, style tcell.Style, txt string) { | ||
| for _, c := range txt { | ||
| var comb []rune | ||
| w := runewidth.RuneWidth(c) | ||
| if w == 0 { | ||
| comb = []rune{c} | ||
| c = ' ' | ||
| w = 1 | ||
| } | ||
| s.SetContent(x, y, c, comb, style) | ||
| x += w | ||
| } | ||
| } | ||
|
|
||
| func box(s tcell.Screen, x1, y1, x2, y2 int, style tcell.Style, r rune) { | ||
| if y2 < y1 { | ||
| y1, y2 = y2, y1 | ||
| } | ||
| if x2 < x1 { | ||
| x1, x2 = x2, x1 | ||
| } | ||
|
|
||
| for col := x1; col <= x2; col++ { | ||
| s.SetContent(col, y1, tcell.RuneHLine, nil, style) | ||
| s.SetContent(col, y2, tcell.RuneHLine, nil, style) | ||
| } | ||
| for row := y1 + 1; row < y2; row++ { | ||
| s.SetContent(x1, row, tcell.RuneVLine, nil, style) | ||
| s.SetContent(x2, row, tcell.RuneVLine, nil, style) | ||
| } | ||
| if y1 != y2 && x1 != x2 { | ||
| // Only add corners if we need to | ||
| s.SetContent(x1, y1, tcell.RuneULCorner, nil, style) | ||
| s.SetContent(x2, y1, tcell.RuneURCorner, nil, style) | ||
| s.SetContent(x1, y2, tcell.RuneLLCorner, nil, style) | ||
| s.SetContent(x2, y2, tcell.RuneLRCorner, nil, style) | ||
| } | ||
| for row := y1 + 1; row < y2; row++ { | ||
| for col := x1 + 1; col < x2; col++ { | ||
| s.SetContent(col, row, r, nil, style) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| type inputtable interface { | ||
| keyPress(e *tcell.EventKey) | ||
| } | ||
|
|
||
| type renderable interface { | ||
| render(s tcell.Screen) | ||
| } | ||
|
|
||
| type widget interface { | ||
| renderable | ||
| inputtable | ||
| } | ||
|
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| type alignType int | ||
|
|
||
| const ( | ||
| alignNone alignType = iota | ||
| alignTop | ||
| alignBottom | ||
| ) | ||
|
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||
| type textbox struct { | ||
| x, y, w, h int | ||
| style tcell.Style | ||
|
|
||
| align alignType | ||
| fw bool | ||
| fh bool | ||
|
|
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| buf string | ||
| } | ||
|
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| func (t *textbox) keyPress(e *tcell.EventKey) { | ||
| switch e.Key() { | ||
| case tcell.KeyBS, tcell.KeyDEL: | ||
| if len(t.buf) > 0 { | ||
| t.buf = t.buf[:len(t.buf)-1] | ||
| } | ||
| default: | ||
| t.buf += string(e.Rune()) | ||
| } | ||
|
|
||
| } | ||
|
|
||
| func (t *textbox) render(s tcell.Screen) { | ||
| x, y, w, h := t.x, t.y, t.w, t.h | ||
|
|
||
| sw, sh := s.Size() | ||
| if t.fw { | ||
| w = sw | ||
| } | ||
| if t.fh { | ||
| h = sh | ||
| } | ||
| switch t.align { | ||
| case alignNone: | ||
| case alignTop: | ||
| x, y = 0, 0 | ||
| case alignBottom: | ||
| x, y = 0, sh-1-h | ||
| } | ||
|
|
||
| box(s, x, y, x+w-1, y+h, t.style, ' ') | ||
|
|
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| text(s, x+1, y+1, t.style, t.buf) | ||
| } | ||
|
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| var focused int | ||
| var widgets []widget | ||
|
|
||
| func currentFocus() widget { | ||
| if focused == len(widgets) { | ||
| return nil | ||
| } | ||
| return widgets[focused] | ||
| } | ||
|
|
||
| func eventLoop() { | ||
| defer close(ch) | ||
|
|
||
| input := &textbox{h: 2, fw: true, align: alignBottom, style: styleWhite} | ||
| widgets = append(widgets, input) | ||
|
|
||
| for { | ||
| for _, w := range widgets { | ||
| w.render(s) | ||
| } | ||
| text(s, 1, 1, styleWhite, "flatend ::") | ||
|
|
||
| s.Show() | ||
|
|
||
| switch e := s.PollEvent().(type) { | ||
| case *tcell.EventResize: | ||
| s.Sync() | ||
| case *tcell.EventKey: | ||
| switch e.Key() { | ||
| case tcell.KeyTAB: | ||
| focused = (focused + 1) % (len(widgets) + 1) | ||
| case tcell.KeyEscape, tcell.KeyExit, tcell.KeyCtrlC: | ||
| return | ||
| case tcell.KeyCtrlL: | ||
| s.Sync() | ||
| default: | ||
| w := currentFocus() | ||
| if w != nil { | ||
| w.keyPress(e) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| var ( | ||
| styleDefault = tcell.StyleDefault.Foreground(tcell.ColorBlack) | ||
| styleWhite = tcell.StyleDefault.Foreground(tcell.ColorWhite) | ||
| ) | ||
|
|
||
| var ( | ||
| s tcell.Screen | ||
| err error | ||
| ch chan struct{} | ||
| ) | ||
|
|
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| func main() { | ||
| encoding.Register() | ||
|
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| s, err = tcell.NewScreen() | ||
| check(err) | ||
|
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| check(s.Init()) | ||
| defer s.Fini() | ||
|
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| s.SetStyle(styleDefault) | ||
| s.EnableMouse() | ||
| s.Clear() | ||
|
|
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| ch = make(chan struct{}) | ||
| go eventLoop() | ||
| <-ch | ||
| } |
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