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93 lines
2.5 KiB
Go
93 lines
2.5 KiB
Go
// Demo code which illustrates how to implement your own primitive.
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package main
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import (
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"fmt"
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"github.com/gdamore/tcell/v2"
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"github.com/rivo/tview"
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)
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// RadioButtons implements a simple primitive for radio button selections.
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type RadioButtons struct {
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*tview.Box
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options []string
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currentOption int
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}
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// NewRadioButtons returns a new radio button primitive.
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func NewRadioButtons(options []string) *RadioButtons {
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return &RadioButtons{
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Box: tview.NewBox(),
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options: options,
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}
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}
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// Draw draws this primitive onto the screen.
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func (r *RadioButtons) Draw(screen tcell.Screen) {
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r.Box.DrawForSubclass(screen, r)
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x, y, width, height := r.GetInnerRect()
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for index, option := range r.options {
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if index >= height {
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break
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}
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radioButton := "\u25ef" // Unchecked.
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if index == r.currentOption {
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radioButton = "\u25c9" // Checked.
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}
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line := fmt.Sprintf(`%s[white] %s`, radioButton, option)
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tview.Print(screen, line, x, y+index, width, tview.AlignLeft, tcell.ColorYellow)
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}
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}
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// InputHandler returns the handler for this primitive.
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func (r *RadioButtons) InputHandler() func(event *tcell.EventKey, setFocus func(p tview.Primitive)) {
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return r.WrapInputHandler(func(event *tcell.EventKey, setFocus func(p tview.Primitive)) {
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switch event.Key() {
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case tcell.KeyUp:
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r.currentOption--
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if r.currentOption < 0 {
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r.currentOption = 0
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}
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case tcell.KeyDown:
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r.currentOption++
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if r.currentOption >= len(r.options) {
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r.currentOption = len(r.options) - 1
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}
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}
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})
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}
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// MouseHandler returns the mouse handler for this primitive.
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func (r *RadioButtons) MouseHandler() func(action tview.MouseAction, event *tcell.EventMouse, setFocus func(p tview.Primitive)) (consumed bool, capture tview.Primitive) {
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return r.WrapMouseHandler(func(action tview.MouseAction, event *tcell.EventMouse, setFocus func(p tview.Primitive)) (consumed bool, capture tview.Primitive) {
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x, y := event.Position()
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_, rectY, _, _ := r.GetInnerRect()
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if !r.InRect(x, y) {
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return false, nil
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}
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if action == tview.MouseLeftClick {
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setFocus(r)
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index := y - rectY
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if index >= 0 && index < len(r.options) {
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r.currentOption = index
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consumed = true
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}
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}
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return
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})
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}
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func main() {
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radioButtons := NewRadioButtons([]string{"Lions", "Elephants", "Giraffes"})
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radioButtons.SetBorder(true).
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SetTitle("Radio Button Demo").
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SetRect(0, 0, 30, 5)
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if err := tview.NewApplication().SetRoot(radioButtons, false).EnableMouse(true).Run(); err != nil {
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panic(err)
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}
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}
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