83 lines
1.9 KiB
Go
83 lines
1.9 KiB
Go
package ui
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import "errors"
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// Checkbox combines a CheckButton with a widget like a Label.
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type Checkbox struct {
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Frame
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button *CheckButton
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child Widget
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}
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// NewCheckbox creates a new Checkbox.
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func NewCheckbox(name string, boolVar *bool, child Widget) *Checkbox {
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return makeCheckbox(name, boolVar, nil, "", child)
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}
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// NewRadiobox creates a new Checkbox in radio mode.
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func NewRadiobox(name string, stringVar *string, value string, child Widget) *Checkbox {
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return makeCheckbox(name, nil, stringVar, value, child)
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}
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// makeCheckbox constructs an appropriate type of checkbox.
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func makeCheckbox(name string, boolVar *bool, stringVar *string, value string, child Widget) *Checkbox {
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// Our custom checkbutton widget.
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mark := NewFrame(name + "_mark")
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mark.Configure(Config{
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Width: 6,
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Height: 6,
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})
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w := &Checkbox{
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child: child,
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}
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if boolVar != nil {
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w.button = NewCheckButton(name+"_button", boolVar, mark)
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} else if stringVar != nil {
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w.button = NewRadioButton(name+"_button", stringVar, value, mark)
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}
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w.Frame.Setup()
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// Forward clicks on the child widget to the CheckButton.
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for _, e := range []Event{MouseOver, MouseOut, MouseUp, MouseDown, Click} {
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func(e Event) {
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w.child.Handle(e, func(ed EventData) error {
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return w.button.Event(e, ed)
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})
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}(e)
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}
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w.Pack(w.button, Pack{
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Side: W,
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})
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w.Pack(w.child, Pack{
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Side: W,
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})
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return w
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}
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// Child returns the child widget.
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func (w *Checkbox) Child() Widget {
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return w.child
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}
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// SetText conveniently sets the button text, for Label children only.
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func (w *Checkbox) SetText(text string) error {
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if label, ok := w.child.(*Label); ok {
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label.Text = text
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}
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return errors.New("child is not a Label widget")
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}
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// Pass event handlers on to descendents.
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func (w *Checkbox) Handle(e Event, fn func(EventData) error) {
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w.button.Handle(e, fn)
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}
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// Supervise the checkbutton inside the widget.
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func (w *Checkbox) Supervise(s *Supervisor) {
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s.Add(w.button)
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s.Add(w.child)
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}
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