68 lines
2.0 KiB
Go
68 lines
2.0 KiB
Go
package input
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import (
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"fmt"
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"unicode/utf8"
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
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)
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type TextAreaOptions struct {
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Placeholder string
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// MaxLength caps runes and shows a count.
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MaxLength int
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// Width is zero for 160 dots, Lines zero for 4.
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Width, Lines int
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Disabled bool
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}
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type areaKey struct{}
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type areaState struct {
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scroll ui.ScrollState
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line int
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text string
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// held is last frame's offset, kept while disabled.
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held float32
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}
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type TextAreaResult = TextInputResult
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// TextArea wraps lines in its own scroll, following the caret.
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func TextArea(c *ui.Context, text string, value *string, o TextAreaOptions) TextAreaResult {
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k := pixel.K(c)
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lines := pixel.Or("TextArea Lines", o.Lines, 4)
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col := ui.Column(c).Width(k.D(pixel.Or("TextArea Width", o.Width, 160))).Gap(k.D(2))
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st := ui.Local(col, areaKey{}, func() areaState { return areaState{line: -1} })
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if o.Disabled {
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st.scroll.Y = st.held
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}
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var ed pixel.Edit
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col.Children(func() {
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view := ui.Scroll(c).TrackScroll(&st.scroll).Height(k.D(lines*pixel.LineHeight+6)).Padding(k.D(3), k.D(4))
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view.Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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g.Frame(0, 0, g.W, g.H, pixel.Sunken, pixel.Well)
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}).Children(func() {
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ed = pixel.Editor(c, value, pixel.EditorOptions{Multiline: true, Label: text, Placeholder: o.Placeholder, MaxLength: o.MaxLength, Disabled: o.Disabled})
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})
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// Keep the caret's line in view after it moves.
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if ed.Line != st.line || *value != st.text {
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top, bottom := k.D(ed.Line*pixel.LineHeight), k.D((ed.Line+1)*pixel.LineHeight)
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if y := max(min(st.scroll.Y, top), bottom-k.D(lines*pixel.LineHeight)); y != st.scroll.Y {
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st.scroll.Y = y
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view.TrackScroll(&st.scroll)
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}
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st.line, st.text = ed.Line, *value
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}
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st.held = st.scroll.Y
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if o.MaxLength > 0 {
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count := fmt.Sprintf("%d/%d", utf8.RuneCountInString(*value), o.MaxLength)
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ui.Row(c).Justify(ui.End).Children(func() { pixel.Text(c, count, pixel.TextOptions{Slot: pixel.Faint}) })
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}
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})
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return result(col, ed, text)
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}
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