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+// license:BSD-3-Clause
+// copyright-holders:Nathan Woods
+/***************************************************************************
+
+ ui/devctrl.h
+
+ Device specific control menu
+ This source provides a base class for any device which need a specific
+ submenu and which can occur multiple times in the same driver (at the
+ moment, cassette tapes and barcode readers, in future possibly other like
+ printers)
+ The base class contains calls to get the total number of devices of
+ the same kind connected to the driver, and shortcuts to switch current
+ device to next one or previous one attached. This allows, for instance,
+ users to pass from a device to another one by simply pressing left/right
+ and the menu is rebuilt accordingly, without the need of a preliminary
+ submenu listing available devices of the same kind.
+
+***************************************************************************/
+
+#pragma once
+
+#ifndef __UI_DEVCTRL_H__
+#define __UI_DEVCTRL_H__
+
+template<class _DeviceType>
+class ui_menu_device_control : public ui_menu
+{
+public:
+ ui_menu_device_control(running_machine &machine, render_container *container, _DeviceType *device);
+
+protected:
+ _DeviceType *current_device() { return m_device; }
+ int count() { return m_count; }
+
+ int current_index();
+ void previous();
+ void next();
+ std::string current_display_name();
+ UINT32 current_display_flags();
+
+private:
+ // device iterator
+ typedef device_type_iterator<&device_creator<_DeviceType>, _DeviceType> iterator;
+
+ _DeviceType * m_device;
+ int m_count;
+};
+
+
+//-------------------------------------------------
+// ctor
+//-------------------------------------------------
+
+template<class _DeviceType>
+ui_menu_device_control<_DeviceType>::ui_menu_device_control(running_machine &machine, render_container *container, _DeviceType *device)
+ : ui_menu(machine, container)
+{
+ iterator iter(machine.root_device());
+ m_count = iter.count();
+ m_device = device ? device : iter.first();
+}
+
+
+//-------------------------------------------------
+// current_index
+//-------------------------------------------------
+
+template<class _DeviceType>
+int ui_menu_device_control<_DeviceType>::current_index()
+{
+ iterator iter(machine().root_device());
+ return iter.indexof(*m_device);
+}
+
+
+//-------------------------------------------------
+// previous
+//-------------------------------------------------
+
+template<class _DeviceType>
+void ui_menu_device_control<_DeviceType>::previous()
+{
+ // left arrow - rotate left through cassette devices
+ if (m_device != nullptr)
+ {
+ iterator iter(machine().root_device());
+ int index = iter.indexof(*m_device);
+ if (index > 0)
+ index--;
+ else
+ index = m_count - 1;
+ m_device = iter.byindex(index);
+ }
+}
+
+
+//-------------------------------------------------
+// next
+//-------------------------------------------------
+
+template<class _DeviceType>
+void ui_menu_device_control<_DeviceType>::next()
+{
+ // right arrow - rotate right through cassette devices
+ if (m_device != nullptr)
+ {
+ iterator iter(machine().root_device());
+ int index = iter.indexof(*m_device);
+ if (index < m_count - 1)
+ index++;
+ else
+ index = 0;
+ m_device = iter.byindex(index);
+ }
+}
+
+
+//-------------------------------------------------
+// current_display_name
+//-------------------------------------------------
+
+template<class _DeviceType>
+std::string ui_menu_device_control<_DeviceType>::current_display_name()
+{
+ std::string display_name;
+ display_name.assign(current_device()->name());
+ if (count() > 1)
+ display_name.append(string_format("%d", current_index() + 1));
+ return display_name;
+}
+
+
+//-------------------------------------------------
+// current_display_flags
+//-------------------------------------------------
+
+template<class _DeviceType>
+UINT32 ui_menu_device_control<_DeviceType>::current_display_flags()
+{
+ UINT32 flags = 0;
+ if (count() > 1)
+ {
+ if (current_index() > 0)
+ flags |= MENU_FLAG_LEFT_ARROW;
+ if (current_index() < count() - 1)
+ flags |= MENU_FLAG_RIGHT_ARROW;
+ }
+ return flags;
+}
+
+
+#endif /* __UI_DEVCTRL_H__ */