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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 checkbox provides a widget which can be checked or unchecked.
package checkbox
import (
"fmt"
"github.com/gcla/gowid"
"github.com/gcla/gowid/gwutil"
"github.com/gcla/gowid/widgets/button"
)
//======================================================================
type IChecked interface {
button.IDecoratedAround
button.IDecoratedMiddle
IsChecked() bool
}
type IWidget interface {
gowid.IWidget
IChecked
}
//======================================================================
type Decoration struct {
button.Decoration
Middle string
}
func (b *Decoration) MiddleDec() string {
return b.Middle
}
func (w *Decoration) SetMiddleDec(dec string, app gowid.IApp) {
w.Middle = dec
}
//======================================================================
type Widget struct {
checked bool
Callbacks *gowid.Callbacks
gowid.ClickCallbacks
Decoration
gowid.AddressProvidesID
gowid.IsSelectable
}
func New(isChecked bool) *Widget {
cb := gowid.NewCallbacks()
res := &Widget{
checked: isChecked,
Callbacks: cb,
ClickCallbacks: gowid.ClickCallbacks{CB: &cb},
Decoration: Decoration{button.Decoration{"[", "]"}, "X"},
}
var _ gowid.IWidget = res
return res
}
func NewDecorated(isChecked bool, decoration Decoration) *Widget {
cb := gowid.NewCallbacks()
res := &Widget{
checked: isChecked,
Callbacks: cb,
ClickCallbacks: gowid.ClickCallbacks{CB: &cb},
Decoration: decoration,
}
var _ gowid.IWidget = res
return res
}
func (w *Widget) String() string {
return fmt.Sprintf("checkbox[%s]", gwutil.If(w.IsChecked(), "X", " ").(string))
}
func (w *Widget) IsChecked() bool {
return w.checked
}
func (w *Widget) SetChecked(app gowid.IApp, val bool) {
w.setChecked(app, val)
}
func (w *Widget) setChecked(app gowid.IApp, val bool) {
w.checked = val
gowid.RunWidgetCallbacks(*w.CB, gowid.ClickCB{}, app, w)
}
func (w *Widget) Click(app gowid.IApp) {
if app.GetMouseState().NoButtonClicked() || app.GetMouseState().LeftIsClicked() {
w.setChecked(app, !w.IsChecked())
}
}
func (w *Widget) RenderSize(size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.IRenderBox {
return gowid.RenderBox{C: len(w.LeftDec()) + len(w.MiddleDec()) + len(w.RightDec()), 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"})
}
return Render(w, size, focus, app)
}
func (w *Widget) UserInput(ev interface{}, size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) bool {
if _, ok := size.(gowid.IRenderFixed); !ok {
panic(gowid.WidgetSizeError{Widget: w, Size: size, Required: "gowid.IRenderFixed"})
}
return button.UserInput(w, ev, size, focus, app)
}
//======================================================================
func Render(w IChecked, size gowid.IRenderSize, focus gowid.Selector, app gowid.IApp) gowid.ICanvas {
line := make([]gowid.Cell, 0)
line = append(line, gowid.CellsFromString(w.LeftDec())...)
if w.IsChecked() {
line = append(line, gowid.CellsFromString(w.MiddleDec())...)
} else {
line = append(line, gowid.CellsFromString(gwutil.StringOfLength(' ', len(w.MiddleDec())))...)
}
line = append(line, gowid.CellsFromString(w.RightDec())...)
res := gowid.NewCanvasWithLines([][]gowid.Cell{line})
res.SetCursorCoords(len(w.LeftDec())+(len(w.MiddleDec())/2), 0)
return res
}
//======================================================================
// Local Variables:
// mode: Go
// fill-column: 110
// End:
|
