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// Copyright 2013 The Walk Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build windows
package declarative
import (
"bytes"
"errors"
)
import (
"github.com/lxn/walk"
)
type RadioButtonGroup struct {
Buttons []RadioButton
DataMember string
Optional bool
}
func (rbg RadioButtonGroup) Create(builder *Builder) error {
if len(rbg.Buttons) == 0 {
return nil
}
var first *walk.RadioButton
for _, rb := range rbg.Buttons {
if first == nil {
if rb.AssignTo == nil {
rb.AssignTo = &first
}
}
if err := rb.Create(builder); err != nil {
return err
}
if first == nil {
first = *rb.AssignTo
}
}
parent := builder.Parent()
builder.Defer(func() error {
group := first.Group()
validator := newRadioButtonGroupValidator(group, parent)
for _, rb := range group.Buttons() {
prop := rb.AsWindowBase().Property("CheckedValue")
if err := prop.SetSource(rbg.DataMember); err != nil {
return err
}
if err := prop.SetValidator(validator); err != nil {
return err
}
}
return nil
})
return nil
}
type radioButtonGroupValidator struct {
group *walk.RadioButtonGroup
err error
}
func newRadioButtonGroupValidator(group *walk.RadioButtonGroup, parent walk.Container) *radioButtonGroupValidator {
b := new(bytes.Buffer)
if gb, ok := parent.(*walk.GroupBox); ok {
b.WriteString(gb.Title())
} else {
for i, rb := range group.Buttons() {
if i > 0 {
b.WriteString(", ")
}
b.WriteString(rb.Text())
}
}
b.WriteString(": ")
b.WriteString(tr("A selection is required.", "walk"))
return &radioButtonGroupValidator{group: group, err: errors.New(b.String())}
}
func (rbgv *radioButtonGroupValidator) Validate(v interface{}) error {
if rbgv.group.CheckedButton() == nil {
return rbgv.err
}
return nil
}
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