doodle/pkg/uix/magic-form/magic_form.go

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// Package magicform helps create simple form layouts with go/ui.
package magicform
import (
"fmt"
"git.kirsle.net/apps/doodle/pkg/log"
"git.kirsle.net/go/render"
"git.kirsle.net/go/ui"
"git.kirsle.net/go/ui/style"
)
type Type int
const (
Auto Type = iota
Text // free, wide Label row
Frame // custom frame from the caller
Button // Single button with a label
Textbox
Checkbox
Radiobox
Selectbox
)
// Form configuration.
type Form struct {
Supervisor *ui.Supervisor // Required for most useful forms
Engine render.Engine
// For vertical forms.
Vertical bool
LabelWidth int // size of left frame for labels.
}
/*
Field for your form (or form-aligned label sections, etc.)
The type of Form control to render is inferred based on bound
variables and other configuration.
*/
type Field struct {
// Type may be inferred by presence of other params.
Type Type
// Set a text string and font for simple labels or paragraphs.
Label string
Font render.Text
// Easy button row: make Buttons an array of Button fields
Buttons []Field
ButtonStyle *style.Button
// Easy Paginator. DO NOT SUPERVISE, let the Create do so!
Pager *ui.Pager
// If you send a *ui.Frame to insert, the Type is inferred
// to be Frame.
Frame *ui.Frame
// Variable bindings, the type may infer to be:
BoolVariable *bool // Checkbox
TextVariable *string // Textbox
Options []Option // Selectbox
SelectValue interface{} // Selectbox default choice
// Tooltip to add to a form control.
// Checkbox only for now.
Tooltip ui.Tooltip // config for the tooltip only
// Handlers you can configure
OnSelect func(value interface{}) // Selectbox
OnClick func() // Button
}
// Option used in Selectbox or Radiobox fields.
type Option struct {
Value interface{}
Label string
}
/*
Create the form field and populate it into the given Frame.
Renders the form vertically.
*/
func (form Form) Create(into *ui.Frame, fields []Field) {
for n, row := range fields {
row := row
if row.Frame != nil {
into.Pack(row.Frame, ui.Pack{
Side: ui.N,
FillX: true,
})
continue
}
frame := ui.NewFrame(fmt.Sprintf("Line %d", n))
into.Pack(frame, ui.Pack{
Side: ui.N,
FillX: true,
})
// Pager row?
if row.Pager != nil {
row.Pager.Compute(form.Engine)
form.Supervisor.Add(row.Pager)
frame.Pack(row.Pager, ui.Pack{
Side: ui.W,
Expand: true,
})
}
// Buttons row?
if row.Buttons != nil && len(row.Buttons) > 0 {
for _, row := range row.Buttons {
row := row
btn := ui.NewButton(row.Label, ui.NewLabel(ui.Label{
Text: row.Label,
Font: row.Font,
}))
if row.ButtonStyle != nil {
btn.SetStyle(row.ButtonStyle)
}
btn.Handle(ui.Click, func(ed ui.EventData) error {
if row.OnClick != nil {
row.OnClick()
} else {
log.Error("No OnClick handler for button %s", row.Label)
}
return nil
})
btn.Compute(form.Engine)
form.Supervisor.Add(btn)
frame.Pack(btn, ui.Pack{
Side: ui.W,
PadX: 4,
PadY: 2,
})
}
continue
}
// Infer the type of the form field.
if row.Type == Auto {
row.Type = row.Infer()
if row.Type == Auto {
continue
}
}
// Is there a label frame to the left?
// - Checkbox gets a full row.
if row.Label != "" && row.Type != Checkbox {
labFrame := ui.NewFrame("Label Frame")
labFrame.Configure(ui.Config{
Width: form.LabelWidth,
})
frame.Pack(labFrame, ui.Pack{
Side: ui.W,
})
// Draw the label text into it.
label := ui.NewLabel(ui.Label{
Text: row.Label,
Font: row.Font,
})
labFrame.Pack(label, ui.Pack{
Side: ui.W,
})
}
// Checkbox?
if row.Type == Checkbox {
cb := ui.NewCheckbox("Checkbox", row.BoolVariable, ui.NewLabel(ui.Label{
Text: row.Label,
Font: row.Font,
}))
cb.Supervise(form.Supervisor)
frame.Pack(cb, ui.Pack{
Side: ui.W,
FillX: true,
})
// Tooltip? TODO - make nicer.
if row.Tooltip.Text != "" || row.Tooltip.TextVariable != nil {
ui.NewTooltip(cb, row.Tooltip)
}
// Handlers
cb.Handle(ui.Click, func(ed ui.EventData) error {
if row.OnClick != nil {
row.OnClick()
}
return nil
})
}
// Selectbox? also Radiobox for now.
if row.Type == Selectbox || row.Type == Radiobox {
btn := ui.NewSelectBox("Select", ui.Label{
Font: row.Font,
})
frame.Pack(btn, ui.Pack{
Side: ui.W,
FillX: true,
Expand: true,
})
if row.Options != nil {
for _, option := range row.Options {
btn.AddItem(option.Label, option.Value, func() {})
}
}
if row.SelectValue != nil {
btn.SetValue(row.SelectValue)
}
btn.Handle(ui.Change, func(ed ui.EventData) error {
if selection, ok := btn.GetValue(); ok {
if row.OnSelect != nil {
row.OnSelect(selection.Value)
}
}
return nil
})
btn.Supervise(form.Supervisor)
form.Supervisor.Add(btn)
}
}
}
/*
Infer the type if the field was of type Auto.
Returns the first Type inferred from the field by checking in
this order:
- Frame if the field has a *Frame
- Checkbox if there is a *BoolVariable
- Selectbox if there are Options
- Textbox if there is a *TextVariable
- Text if there is a Label
May return Auto if none of the above and be ignored.
*/
func (field Field) Infer() Type {
if field.Frame != nil {
return Frame
}
if field.BoolVariable != nil {
return Checkbox
}
if field.Options != nil && len(field.Options) > 0 {
return Selectbox
}
if field.TextVariable != nil {
return Textbox
}
if field.Label != "" {
return Text
}
return Auto
}