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// Copyright 2019-2022 Graham Clark. All rights reserved. Use of this source
// code is governed by the MIT license that can be found in the LICENSE
// file.
// Package radio provides radio button widgets where one can be selected among many.
package radio
import (
"fmt"
"github.com/gcla/gowid"
"github.com/gcla/gowid/gwutil"
"github.com/gcla/gowid/widgets/button"
"github.com/gcla/gowid/widgets/checkbox"
)
//======================================================================
type IWidget interface {
gowid.IWidget
gowid.ICallbacks
IsChecked() bool
Group() *[]IWidget
SetStateInternal(selected bool)
}
type Widget struct {
Selected bool
group *[]IWidget
*gowid.Callbacks
gowid.ClickCallbacks
checkbox.Decoration
gowid.AddressProvidesID
gowid.IsSelectable
}
// If the group supplied is empty, this radio button will be marked as selected, regardless
// of the isChecked parameter.
func New(group *[]IWidget) *Widget {
res := &Widget{
Selected: false,
group: group,
Decoration: checkbox.Decoration{button.Decoration{"(", ")"}, "X"},
}
res.ClickCallbacks = gowid.ClickCallbacks{CB: &res.Callbacks}
res.initRadioButton(group)
var _ IWidget = res
return res
}
func NewDecorated(group *[]IWidget, decoration checkbox.Decoration) *Widget {
res := &Widget{
Selected: false,
group: group,
Decoration: decoration,
}
res.ClickCallbacks = gowid.ClickCallbacks{CB: &res.Callbacks}
res.initRadioButton(group)
var _ gowid.IWidget = res
return res
}
func (w *Widget) initRadioButton(group *[]IWidget) {
*group = append(*group, w)
if len(*group) == 1 {
w.SetStateInternal(true)
}
}
func (w *Widget) String() string {
return fmt.Sprintf("radio[%s]", gwutil.If(w.IsChecked(), "X", " ").(string))
}
func (w *Widget) Select(app gowid.IApp) {
Select(w, app)
}
func (w *Widget) Group() *[]IWidget {
return w.group
}
// Don't ensure consistency of other widgets, but do issue callbacks for
// state change. TODO - need to do callbacks here to capture
// losing selection
func (w *Widget) SetStateInternal(selected bool) {
w.Selected = selected
}
func (w *Widget) IsChecked() bool {
return w.Selected
}
func (w *Widget) Click(app gowid.IApp) {
if app.GetMouseState().NoButtonClicked() || app.GetMouseState().LeftIsClicked() {
w.Select(app)
}
}
func (w *Widget) RenderSize(size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.IRenderBox {
if _, ok := size.(gowid.IRenderFixed); !ok {
panic(gowid.WidgetSizeError{Widget: w, Size: size, Required: "gowid.IRenderFixed"})
}
return gowid.RenderBox{C: len(w.LeftDec()) + len(w.RightDec()) + len(w.MiddleDec()), R: 1}
}
func (w *Widget) Render(size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.ICanvas {
if _, ok := size.(gowid.IRenderFixed); !ok {
panic(gowid.WidgetSizeError{Widget: w, Size: size, Required: "gowid.IRenderFixed"})
}
res := checkbox.Render(w, size, focus, app)
return res
}
func (w *Widget) UserInput(ev interface{}, size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) bool {
return button.UserInput(w, ev, size, focus, app)
}
//''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
func Select(w IWidget, app gowid.IApp) {
cur := w.IsChecked()
if !cur {
for _, w2 := range *w.Group() {
if w != w2 && w2.IsChecked() {
w2.SetStateInternal(false)
gowid.RunWidgetCallbacks(w2, gowid.ClickCB{}, app, w2)
break
}
}
w.SetStateInternal(true)
gowid.RunWidgetCallbacks(w, gowid.ClickCB{}, app, w)
}
}
//======================================================================
// This is here to avoid import cycles
type RadioButtonTester struct {
State bool
}
func (f *RadioButtonTester) Changed(app gowid.IApp, w gowid.IWidget, data ...interface{}) {
rb := w.(*Widget)
f.State = rb.Selected
}
func (f *RadioButtonTester) ID() interface{} { return "bar" }
//======================================================================
// Local Variables:
// mode: Go
// fill-column: 110
// End:
|
