backbutton.go

package backbutton

import (
	"github.com/diamondburned/gotk4-adwaita/pkg/adw"
	"github.com/diamondburned/gotk4/pkg/gtk/v4"
)

// BackButtonIcon is the default icon name for a fold reveal button.
const BackButtonIcon = "sidebar-show-symbolic"

// BackButton is a button that toggles whether or not the fold's sidebar
// should be revealed.
type BackButton struct {
	*gtk.ToggleButton
}

// New creates a new fold reveal button. The button is hidden by default until a
// sidebar is connected to it.
func New() *BackButton {
	button := gtk.NewToggleButton()
	button.SetIconName(BackButtonIcon)
	button.SetVisible(false)
	button.SetHAlign(gtk.AlignCenter)
	button.SetVAlign(gtk.AlignCenter)

	return &BackButton{
		ToggleButton: button,
	}
}

// SetIconName sets the reveal button's icon name.
func (b *BackButton) SetIconName(icon string) {
	b.Button.SetIconName(icon)
}

// ConnectFold connects the current sidebar reveal button to the given
// sidebar.
func (b *BackButton) ConnectSplitView(view *adw.OverlaySplitView) {
	view.NotifyProperty("show-sidebar", func() {
		b.SetActive(view.ShowSidebar())
	})

	view.NotifyProperty("collapsed", func() {
		collapsed := view.Collapsed()
		b.Button.SetVisible(collapsed)
	})

	// Specifically bind to "clicked" rather than notifying on "active" to
	// prevent infinite recursion.
	b.Button.ConnectClicked(func() {
		view.SetShowSidebar(b.Active())
	})
}