101 lines
3.0 KiB
Go
101 lines
3.0 KiB
Go
package input
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import (
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/MujicaUI/core"
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"git.zacharyzhang.com/ZacharyZhang-NY/MujicaUI/theme"
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)
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// FormFieldOptions configure a FormField.
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type FormFieldOptions struct {
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// Required marks the label; the check itself belongs to the caller or Form.
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Required bool
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Description string
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// Error shows below the control and marks it invalid for assistive technology.
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Error string
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// Horizontal puts the label beside the control instead of above it.
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Horizontal bool
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}
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// FormField labels the element control returns and shows help and error text for it.
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func FormField(c *ui.Context, label string, opts FormFieldOptions, control func() *ui.Element) *ui.Element {
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if !opts.Horizontal {
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return formFieldBuild(c, "", label, opts, false, control)
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}
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var f *ui.Element
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formFieldGrid(c, func() { f = formFieldBuild(c, "", label, opts, true, control) })
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return f
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}
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// formFieldGrid holds fields whose labels sit in a column beside their controls.
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func formFieldGrid(c *ui.Context, fields func()) *ui.Element {
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d := core.Density(c)
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return ui.Grid(c).ColumnTracks(ui.FitContent(), ui.Fr(1)).GapX(d.Unit() * 3).GapY(d.Unit() * 4).
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AlignItems(ui.Start).Children(fields)
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}
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// formFieldBuild builds the label and the control column; beside makes them two grid cells.
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// formFieldBuild keys its cells by key when set, so focus follows a reordered field.
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func formFieldBuild(c *ui.Context, key, label string, opts FormFieldOptions, beside bool, control func() *ui.Element) *ui.Element {
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if label == "" {
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panic("mujica: FormField needs a label")
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}
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k := core.Tokens(c)
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d := core.Density(c)
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var head, content, ctrl *ui.Element
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body := func() {
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head = ui.Row(c)
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if key != "" && beside {
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head.Key(key + "/label")
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}
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head.Gap(d.Unit()).AlignItems(ui.Center)
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if beside {
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head.MinHeight(d.ControlHeight()).Justify(ui.End)
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}
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var text *ui.Element
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head.Children(func() {
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text = ui.Text(c, label).FontWeight(500).SingleLine()
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if opts.Required {
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ui.Text(c, "*").TextColor(k.Danger).Role(ui.RoleNone)
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}
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})
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clicked := head.Clicked()
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content = ui.Column(c)
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if key != "" && beside {
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content.Key(key + "/control")
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}
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content.Gap(d.Unit() * 1.5).MinWidth(0)
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content.Children(func() {
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ctrl = control()
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if ctrl == nil {
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panic("mujica: FormField " + label + ": control returned nil")
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}
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if opts.Description != "" {
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ui.Text(c, opts.Description).TextColor(k.TextMuted).FontSize(core.FontSize(c, theme.CaptionSize)).Role(ui.RoleNone)
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}
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if opts.Error != "" {
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ui.Text(c, opts.Error).TextColor(k.Danger).FontSize(core.FontSize(c, theme.CaptionSize)).Role(ui.RoleNone)
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}
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})
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ctrl.Label(label).Description(opts.Description).Error(opts.Error)
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if opts.Required {
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ctrl.Description(core.Msg(c, "form.required"))
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}
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if ctrl.IsDisabled() {
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text.TextColor(k.TextMuted)
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} else if clicked {
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ctrl.Focus()
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}
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}
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if beside {
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body()
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return content
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}
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root := ui.Column(c)
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if key != "" {
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root.Key(key)
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}
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return root.Gap(d.Unit() * 1.5).Children(body)
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}
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