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path: root/lib/ui/textinput.go
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Diffstat (limited to 'lib/ui/textinput.go')
-rw-r--r--lib/ui/textinput.go136
1 files changed, 136 insertions, 0 deletions
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
+}