diff options
Diffstat (limited to 'lib/ui/textinput.go')
| -rw-r--r-- | lib/ui/textinput.go | 273 |
1 files changed, 223 insertions, 50 deletions
diff --git a/lib/ui/textinput.go b/lib/ui/textinput.go index e81e836..de7557a 100644 --- a/lib/ui/textinput.go +++ b/lib/ui/textinput.go @@ -1,6 +1,9 @@ package ui import ( + "math" + "time" + "github.com/gdamore/tcell" "github.com/mattn/go-runewidth" ) @@ -10,18 +13,20 @@ import ( type TextInput struct { Invalidatable - cells int - ctx *Context - focus bool - index int - password bool - prompt string - scroll int - text []rune - change []func(ti *TextInput) - tabcomplete func(s string) []string - completions []string - completeIndex int + cells int + ctx *Context + focus bool + index int + password bool + prompt string + scroll int + text []rune + change []func(ti *TextInput) + tabcomplete func(s string) []string + completions []string + completeIndex int + completeDelay time.Duration + completeDebouncer *time.Timer } // Creates a new TextInput. TextInputs will render a "textbox" in the entire @@ -46,8 +51,9 @@ func (ti *TextInput) Prompt(prompt string) *TextInput { } func (ti *TextInput) TabComplete( - tabcomplete func(s string) []string) *TextInput { + tabcomplete func(s string) []string, d time.Duration) *TextInput { ti.tabcomplete = tabcomplete + ti.completeDelay = d return ti } @@ -95,9 +101,37 @@ func (ti *TextInput) Draw(ctx *Context) { cells := runewidth.StringWidth(string(text[:sindex]) + ti.prompt) if ti.focus { ctx.SetCursor(cells, 0) + ti.drawPopover(ctx) } } +func (ti *TextInput) drawPopover(ctx *Context) { + if len(ti.completions) == 0 { + return + } + cmp := &completions{ + options: ti.completions, + idx: ti.completeIndex, + stringLeft: ti.StringLeft(), + onSelect: func(idx int) { + ti.completeIndex = idx + ti.Invalidate() + }, + onExec: func() { + ti.executeCompletion() + ti.invalidateCompletions() + ti.Invalidate() + }, + onStem: func(stem string) { + ti.Set(stem + ti.StringRight()) + ti.Invalidate() + }, + } + width := maxLen(ti.completions) + 3 + height := len(ti.completions) + ctx.Popover(0, 0, width, height, cmp) +} + func (ti *TextInput) MouseEvent(localX int, localY int, event tcell.Event) { switch event := event.(type) { case *tcell.EventMouse: @@ -208,32 +242,7 @@ func (ti *TextInput) backspace() { } } -func (ti *TextInput) nextCompletion() { - if ti.completions == nil { - if ti.tabcomplete == nil { - return - } - ti.completions = ti.tabcomplete(ti.StringLeft()) - ti.completeIndex = 0 - } else { - ti.completeIndex++ - if ti.completeIndex >= len(ti.completions) { - ti.completeIndex = 0 - } - } - if len(ti.completions) > 0 { - ti.Set(ti.completions[ti.completeIndex] + ti.StringRight()) - } -} - -func (ti *TextInput) previousCompletion() { - if ti.completions == nil || len(ti.completions) == 0 { - return - } - ti.completeIndex-- - if ti.completeIndex < 0 { - ti.completeIndex = len(ti.completions) - 1 - } +func (ti *TextInput) executeCompletion() { if len(ti.completions) > 0 { ti.Set(ti.completions[ti.completeIndex] + ti.StringRight()) } @@ -244,11 +253,33 @@ func (ti *TextInput) invalidateCompletions() { } func (ti *TextInput) onChange() { + ti.updateCompletions() for _, change := range ti.change { change(ti) } } +func (ti *TextInput) updateCompletions() { + if ti.tabcomplete == nil { + // no completer + return + } + if ti.completeDebouncer == nil { + ti.completeDebouncer = time.AfterFunc(ti.completeDelay, func() { + ti.showCompletions() + }) + } else { + ti.completeDebouncer.Stop() + ti.completeDebouncer.Reset(ti.completeDelay) + } +} + +func (ti *TextInput) showCompletions() { + ti.completions = ti.tabcomplete(ti.StringLeft()) + ti.completeIndex = 0 + ti.Invalidate() +} + func (ti *TextInput) OnChange(onChange func(ti *TextInput)) { ti.change = append(ti.change, onChange) } @@ -296,18 +327,13 @@ func (ti *TextInput) Event(event tcell.Event) bool { case tcell.KeyCtrlU: ti.invalidateCompletions() ti.deleteLineBackward() - case tcell.KeyTab: - if ti.tabcomplete != nil { - ti.nextCompletion() - } else { - ti.insert('\t') - } - ti.Invalidate() - case tcell.KeyBacktab: - if ti.tabcomplete != nil { - ti.previousCompletion() + case tcell.KeyESC: + if ti.completions != nil { + ti.invalidateCompletions() + ti.Invalidate() } - ti.Invalidate() + case tcell.KeyTab: + ti.showCompletions() case tcell.KeyRune: ti.invalidateCompletions() ti.insert(event.Rune()) @@ -315,3 +341,150 @@ func (ti *TextInput) Event(event tcell.Event) bool { } return true } + +type completions struct { + options []string + stringLeft string + idx int + onSelect func(int) + onExec func() + onStem func(string) +} + +func maxLen(ss []string) int { + max := 0 + for _, s := range ss { + l := runewidth.StringWidth(s) + if l > max { + max = l + } + } + return max +} + +func (c *completions) Draw(ctx *Context) { + bg := tcell.StyleDefault + sel := tcell.StyleDefault.Reverse(true) + gutter := tcell.StyleDefault + pill := tcell.StyleDefault.Reverse(true) + + ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', bg) + + numVisible := ctx.Height() + startIdx := 0 + if len(c.options) > numVisible && c.idx+1 > numVisible { + startIdx = c.idx - (numVisible - 1) + } + endIdx := startIdx + numVisible - 1 + + for idx, opt := range c.options { + if idx < startIdx { + continue + } + if idx > endIdx { + continue + } + if c.idx == idx { + ctx.Fill(0, idx-startIdx, ctx.Width(), 1, ' ', sel) + ctx.Printf(0, idx-startIdx, sel, " %s ", opt) + } else { + ctx.Printf(0, idx-startIdx, bg, " %s ", opt) + } + } + + percentVisible := float64(numVisible) / float64(len(c.options)) + if percentVisible >= 1.0 { + return + } + + // gutter + ctx.Fill(ctx.Width()-1, 0, 1, ctx.Height(), ' ', gutter) + + pillSize := int(math.Ceil(float64(ctx.Height()) * percentVisible)) + percentScrolled := float64(startIdx) / float64(len(c.options)) + pillOffset := int(math.Floor(float64(ctx.Height()) * percentScrolled)) + ctx.Fill(ctx.Width()-1, pillOffset, 1, pillSize, ' ', pill) +} + +func (c *completions) next() { + idx := c.idx + idx++ + if idx > len(c.options)-1 { + idx = 0 + } + c.onSelect(idx) +} + +func (c *completions) prev() { + idx := c.idx + idx-- + if idx < 0 { + idx = len(c.options) - 1 + } + c.onSelect(idx) +} + +func (c *completions) Event(e tcell.Event) bool { + switch e := e.(type) { + case *tcell.EventKey: + switch e.Key() { + case tcell.KeyTab: + if len(c.options) == 1 { + c.onExec() + } else { + stem := findStem(c.options) + if stem != "" && stem != c.stringLeft { + c.onStem(stem) + } else { + c.next() + } + } + return true + case tcell.KeyCtrlN, tcell.KeyDown: + c.next() + return true + case tcell.KeyBacktab, tcell.KeyCtrlP, tcell.KeyUp: + c.prev() + return true + case tcell.KeyEnter: + c.onExec() + return true + } + } + return false +} + +func findStem(words []string) string { + if len(words) <= 0 { + return "" + } + if len(words) == 1 { + return words[0] + } + var stem string + stemLen := 1 + firstWord := []rune(words[0]) + for { + if len(firstWord) < stemLen { + return stem + } + var r rune = firstWord[stemLen-1] + for _, word := range words[1:] { + runes := []rune(word) + if len(runes) < stemLen { + return stem + } + if runes[stemLen-1] != r { + return stem + } + } + stem = stem + string(r) + stemLen++ + } +} + +func (c *completions) Focus(_ bool) {} + +func (c *completions) Invalidate() {} + +func (c *completions) OnInvalidate(_ func(Drawable)) {} |