PX4-Autopilot/NxWidgets

NXWidgets

=========



In order to better support NuttX based platforms, a special graphical user

interface has been created called NXWidgets. NXWidgets is written in C++

and integrates seamlessly with the NuttX NX graphics subsystem in order

to provide graphic objects, or "widgets," in the NX Graphics Subsystem



Some of the features of NXWidgets include:



o Conservative C++



  NXWidgets is written entirely in C++ but using only selected “embedded

  friendly” C++ constructs that are fully supported under NuttX. No

  additional C++ support libraries are required.



o NX Integration



  NXWidgets integrate seamlessly with the NX graphics system. Think of the

  X server under Linux … the NX graphics system is like a tiny X server

  that provides windowing under NuttX. By adding NXWidgets, you can support

  graphics objects like buttons and text boxes in the NX windows and toolbars.



o Small Footprint



  NXWidgets is tailored for use MCUs in embedded applications. It is ideally

  suited for mid- and upper-range of most MCU families. A complete NXWidgets

  is possible in as little as 40Kb of FLASH and maybe 4Kb of SRAM.



o Output Devices



  NXWidgets will work on the high-end frame buffer devices as well as on LCDs

  connected via serial or parallel ports to a small MCU.



o Input Devices



  NXWidgets will accept position and selection inputs from a mouse or a

  touchscreen. It will also support character input from a keyboard such as a

  USB keyboard. NXWidgets supports on very special widget called CKeypad that

  will provide keyboard input via an on-screen keypad that can be operated

  via mouse or touchscreen inputs.



o Many Graphic Objects



  Some of the graphic objects supported by NXWidgets include labels, buttons,

  text boxes, button arrays, check boxes, cycle buttons, images, sliders,

  scrollable list boxes, progress bars, and more.



Note:  Many of the fundamental classed in NxWidgets derive from the Antony

Dzeryn's "Woopsi" project: http://woopsi.org/ which also has a BSD style

license.  See the COPYING file for details.



Directory Structure

===================



libnxwidgets



  The source code, header files, and build environment for NxWidgets is

  provided in this directory. 



UnitTests



  Provides a collection of unit-level tests for many of the individual

  widgets provided by libnxwidgets.



nxwm



  This directory holds a tiny desktop for small embedded devices with a

  touchscreen,. NxWM.  NxWM is truly multiple window manager but only one

  window is displayed at a time.  This simplification helps performance on

  LCD based products (in the same way that a tiled window manager helps)

  and also makes the best use of small displays.  It is awkward from a

  human factors point-of-view trying to manage multiple windows on a

  small display.



  The window manager consists of a task bar with icons representing the

  running tasks.  If you touch the tasks icon, it comes to the top.  Each

  window has a toolbar with (1) a title, (2) a minimize button, and (3) a

  stop application button using the standard icons for these things.



  There is always a start window that is available in the task bar.  When

  you touch the start window icon, it brings up the start window containing

  icons representing all of the available applications.  If you touch an

  icon in the start window, it will be started and added to the task bar.



  There is a base class that defines an add-on application and an

  interface that supports incorporation of new application.  The only

  application that is provided is NxConsole.  This is an  NSH session

  running in a window.  I should be able to select the NX icon in the start

  menu and create as many NSH sessions in windows as I want. (keybard input

  still comes through serial).