From 8fa458323058c8998408f88b80d07c687fccd521 Mon Sep 17 00:00:00 2001 From: Drew DeVault Date: Sat, 11 May 2019 13:12:44 -0400 Subject: Split ex line text handling into dedicated widget --- lib/ui/textinput.go | 136 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 136 insertions(+) create mode 100644 lib/ui/textinput.go (limited to 'lib') diff --git a/lib/ui/textinput.go b/lib/ui/textinput.go new file mode 100644 index 0000000..aff520b --- /dev/null +++ b/lib/ui/textinput.go @@ -0,0 +1,136 @@ +package ui + +import ( + "github.com/gdamore/tcell" + "github.com/mattn/go-runewidth" +) + +// TODO: Attach history and tab completion providers +// TODO: scrolling + +type TextInput struct { + Invalidatable + cells int + ctx *Context + focus bool + index int + prompt string + scroll int + text []rune +} + +// Creates a new TextInput. TextInputs will render a "textbox" in the entire +// context they're given, and process keypresses to build a string from user +// input. +func NewTextInput() *TextInput { + return &TextInput{ + cells: -1, + text: []rune{}, + } +} + +func (ti *TextInput) Prompt(prompt string) *TextInput { + ti.prompt = prompt + return ti +} + +func (ti *TextInput) String() string { + return string(ti.text) +} + +func (ti *TextInput) Invalidate() { + ti.DoInvalidate(ti) +} + +func (ti *TextInput) Draw(ctx *Context) { + ti.ctx = ctx // gross + ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault) + ctx.Printf(0, 0, tcell.StyleDefault, "%s%s", ti.prompt, string(ti.text)) + cells := runewidth.StringWidth(string(ti.text[:ti.index])) + if cells != ti.cells { + ctx.SetCursor(cells+1, 0) + } +} + +func (ti *TextInput) Focus(focus bool) { + ti.focus = focus + if focus && ti.ctx != nil { + cells := runewidth.StringWidth(string(ti.text[:ti.index])) + ti.ctx.SetCursor(cells+1, 0) + } +} + +func (ti *TextInput) insert(ch rune) { + left := ti.text[:ti.index] + right := ti.text[ti.index:] + ti.text = append(left, append([]rune{ch}, right...)...) + ti.index++ + ti.Invalidate() +} + +func (ti *TextInput) deleteWord() { + // TODO: Break on any of / " ' + if len(ti.text) == 0 { + return + } + i := ti.index - 1 + if ti.text[i] == ' ' { + i-- + } + for ; i >= 0; i-- { + if ti.text[i] == ' ' { + break + } + } + ti.text = append(ti.text[:i+1], ti.text[ti.index:]...) + ti.index = i + 1 + ti.Invalidate() +} + +func (ti *TextInput) deleteChar() { + if len(ti.text) > 0 && ti.index != len(ti.text) { + ti.text = append(ti.text[:ti.index], ti.text[ti.index+1:]...) + ti.Invalidate() + } +} + +func (ti *TextInput) backspace() { + if len(ti.text) > 0 && ti.index != 0 { + ti.text = append(ti.text[:ti.index-1], ti.text[ti.index:]...) + ti.index-- + ti.Invalidate() + } +} + +func (ti *TextInput) Event(event tcell.Event) bool { + switch event := event.(type) { + case *tcell.EventKey: + switch event.Key() { + case tcell.KeyBackspace, tcell.KeyBackspace2: + ti.backspace() + case tcell.KeyCtrlD, tcell.KeyDelete: + ti.deleteChar() + case tcell.KeyCtrlB, tcell.KeyLeft: + if ti.index > 0 { + ti.index-- + ti.Invalidate() + } + case tcell.KeyCtrlF, tcell.KeyRight: + if ti.index < len(ti.text) { + ti.index++ + ti.Invalidate() + } + case tcell.KeyCtrlA, tcell.KeyHome: + ti.index = 0 + ti.Invalidate() + case tcell.KeyCtrlE, tcell.KeyEnd: + ti.index = len(ti.text) + ti.Invalidate() + case tcell.KeyCtrlW: + ti.deleteWord() + case tcell.KeyRune: + ti.insert(event.Rune()) + } + } + return true +} -- cgit v1.2.3