forked from Archive/PX4-Autopilot
92 lines
3.7 KiB
Plaintext
92 lines
3.7 KiB
Plaintext
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NXWidgets
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=========
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In order to better support NuttX based platforms, a special graphical user
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interface has been created called NXWidgets. NXWidgets is written in C++
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and integrates seamlessly with the NuttX NX graphics subsystem in order
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to provide graphic objects, or "widgets," in the NX Graphics Subsystem
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Some of the features of NXWidgets include:
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o Conservative C++
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NXWidgets is written entirely in C++ but using only selected <20>embedded
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friendly<6C> C++ constructs that are fully supported under NuttX. No
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additional C++ support libraries are required.
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o NX Integration
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NXWidgets integrate seamlessly with the NX graphics system. Think of the
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X server under Linux <20> the NX graphics system is like a tiny X server
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that provides windowing under NuttX. By adding NXWidgets, you can support
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graphics objects like buttons and text boxes in the NX windows and toolbars.
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o Small Footprint
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NXWidgets is tailored for use MCUs in embedded applications. It is ideally
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suited for mid- and upper-range of most MCU families. A complete NXWidgets
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is possible in as little as 40Kb of FLASH and maybe 4Kb of SRAM.
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o Output Devices
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NXWidgets will work on the high-end frame buffer devices as well as on LCDs
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connected via serial or parallel ports to a small MCU.
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o Input Devices
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NXWidgets will accept position and selection inputs from a mouse or a
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touchscreen. It will also support character input from a keyboard such as a
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USB keyboard. NXWidgets supports on very special widget called CKeypad that
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will provide keyboard input via an on-screen keypad that can be operated
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via mouse or touchscreen inputs.
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o Many Graphic Objects
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Some of the graphic objects supported by NXWidgets include labels, buttons,
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text boxes, button arrays, check boxes, cycle buttons, images, sliders,
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scrollable list boxes, progress bars, and more.
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Note: Many of the fundamental classed in NxWidgets derive from the Antony
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Dzeryn's "Woopsi" project: http://woopsi.org/ which also has a BSD style
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license. See the COPYING file for details.
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Directory Structure
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===================
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libnxwidgets
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The source code, header files, and build environment for NxWidgets is
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provided in this directory.
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UnitTests
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Provides a collection of unit-level tests for many of the individual
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widgets provided by libnxwidgets.
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nxwm
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This directory holds a tiny desktop for small embedded devices with a
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touchscreen,. NxWM. NxWM is true multiple window manager but only one
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window is displayed at a time. This simplification helps performance on
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LCD based products (in the same way that a tiled window manager helps)
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and also makes the best use of small displays. It is awkward from a
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human factors point-of-view trying to manage multiple windows on a
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small display.
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The window manager consists of a task bar with icons representing the
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running tasks. If you touch the task's icon, it comes to the top. Each
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window has a toolbar with (1) a title, (2) a minimize button, and (3) a
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stop application button using the standard icons for these things.
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There is always a start window that is available in the task bar. When
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you touch the start window icon, it brings up the start window containing
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icons representing all of the available applications. If you touch an
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icon in the start window, it will be started and added to the task bar.
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There is a base class that defines an add-on application and an
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interface that supports incorporation of new application. The only
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application that is provided is NxConsole. This is an NSH session
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running in a window. You should be able to select the NX icon in the start
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menu and create as many NSH sessions in windows as you want. (keybard input
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still comes through serial).
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