104 lines
3.1 KiB
Go
104 lines
3.1 KiB
Go
package mujica
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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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"mujicaui/theme"
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)
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// TextAreaOptions configure a TextArea.
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type TextAreaOptions struct {
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Placeholder string
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// Label names the field for assistive technology.
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Label string
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// MinHeight is the least height in DIPs; zero fits three lines.
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MinHeight float32
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// MaxHeight caps the height in DIPs, then the text scrolls; zero grows freely.
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MaxHeight float32
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// MaxLength shows a character count against it; zero hides the count.
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MaxLength int
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// SubmitKey with SubmitMods submits; a zero key means Cmd+Enter.
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SubmitKey ui.Key
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SubmitMods ui.Modifiers
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Disabled bool
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ReadOnly bool
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// Error marks the value invalid and shows the message below.
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Error string
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// keys sees keys before the editor, for PromptComposer's menus.
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keys func(ui.InputEvent) bool
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}
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// TextArea is a multi-line field editing *value.
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func TextArea(c *ui.Context, value *string, opts TextAreaOptions) InputResult {
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if value == nil {
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panic("mujica: TextArea needs a value")
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}
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if opts.MinHeight < 0 || opts.MaxHeight < 0 || opts.MaxHeight > 0 && opts.MaxHeight < opts.MinHeight {
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panic("mujica: TextArea needs 0 <= MinHeight <= MaxHeight")
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}
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if opts.MaxLength < 0 {
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panic("mujica: TextArea MaxLength is negative")
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}
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key, mods := opts.SubmitKey, opts.SubmitMods
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if key == 0 {
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key, mods = ui.KeyEnter, ui.Cmd
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}
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d := Density(c)
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n := utf8.RuneCountInString(*value)
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over := opts.MaxLength > 0 && n > opts.MaxLength
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errMsg := opts.Error
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if errMsg == "" && over {
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errMsg = fmt.Sprintf(msg(c, "text_area.over"), n-opts.MaxLength)
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}
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count := textAreaCount(c, n, opts.MaxLength)
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var r InputResult
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look := &textInputLook{disabled: opts.Disabled, readOnly: opts.ReadOnly, err: errMsg, area: true}
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r.Element, r.Input = textInputFrame(c, look, func(frame *ui.Element) *ui.Element {
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in := textInputEditor(c, frame, value, opts.ReadOnly || look.disabled, ui.TextAreaBase).Grow(1).Padding(d.Unit()*2, d.Unit()*3).
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Placeholder(opts.Placeholder).Label(opts.Label)
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if opts.MinHeight > 0 {
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in.MinHeight(opts.MinHeight)
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}
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if opts.MaxHeight > 0 {
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in.MaxHeight(opts.MaxHeight)
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}
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r.changed = in.Changed() && !opts.ReadOnly && !look.disabled
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// Taken before the editor, which would make a plain Enter a newline.
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submit := ui.Local(frame, "submit", func() bool { return false })
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in.HandleInput(func(ev ui.InputEvent) bool {
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if opts.keys != nil && opts.keys(ev) {
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return true
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}
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if ev.Kind == ui.InputKeyDown && ev.Key == key && ev.Mods == mods {
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*submit = true
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return true
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}
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return false
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})
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r.submitted = *submit && !look.disabled
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*submit = false
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return in
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}, count)
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return r
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}
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// textAreaCount builds the character count against max, or nil without one.
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func textAreaCount(c *ui.Context, n, max int) func() {
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if max == 0 {
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return nil
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}
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return func() {
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k := Tokens(c)
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color := k.TextMuted
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over := n > max
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if over {
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color = k.Danger
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}
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ui.Text(c, fmt.Sprintf("%d / %d", n, max)).TextColor(color).FontSize(FontSize(c, theme.CaptionSize)).
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FontFeatures("tnum").Shrink(0).Label(fmt.Sprintf(msg(c, "text_area.count"), n, max))
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}
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}
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