# On iOS, check boxes are a layout composed of a label and an `UISwitch`
redef class CheckBox

	redef type NATIVE: UIStackView
	redef fun native do return layout.native

	# Root layout implementing this check box
	var layout = new HorizontalLayout(parent=self.parent)

	# Label with the text
	var lbl = new Label(parent=layout)

	# `UISwitch` acting as the real check box
	var ui_switch: UISwitch is noautoinit

	redef fun on_ios_event do notify_observers new ToggleEvent(self)

	init
	do
		# Tweak the layout so it is centered
		layout.native.distribution = new UIStackViewDistribution.equal_spacing
		layout.native.alignment = new UIStackViewAlignment.fill
		layout.native.layout_margins_relative_arrangement = true

		var s = new UISwitch
		native.add_arranged_subview s
		ui_switch = s

		ui_switch.set_callback self
	end

	redef fun text=(text) do lbl.text = text
	redef fun text do return lbl.text

	redef fun is_checked do return ui_switch.on
	redef fun is_checked=(value) do ui_switch.set_on_animated(value, true)
end

redef class CheckBox
	redef type NATIVE: GtkCheckButton
	redef var native = new GtkCheckButton

	redef fun signal(sender, data) do notify_observers new ToggleEvent(self)
	init do native.signal_connect("toggled", self, null)

	redef fun text do return native.text
	redef fun text=(value) do native.text = (value or else "").to_s

	redef fun is_checked do return native.active
	redef fun is_checked=(value) do native.active = value
end

redef class CheckBox
	redef type NATIVE: Android_widget_CompoundButton
	redef var native do return (new Android_widget_CheckBox(app.native_activity)).new_global_ref
	init do set_callback_on_toggle(native)

	redef fun is_checked do return native.is_checked
	redef fun is_checked=(value) do native.set_checked(value)

	private fun on_toggle do notify_observers new ToggleEvent(self)

	private fun set_callback_on_toggle(view: NATIVE)
	import on_toggle in "Java" `{
		final nit.app.NitObject final_sender_object = self;
		CheckBox_incr_ref(final_sender_object);

		view.setOnCheckedChangeListener(
			new android.widget.CompoundButton.OnCheckedChangeListener() {
				@Override
				public void onCheckedChanged(android.widget.CompoundButton buttonView, boolean isChecked) {
					CheckBox_on_toggle(final_sender_object);
				}
			});
	`}
end