Crate pushrod

Pushrod is a Cross Platform UI Widget Library for Rust.

It is intended to be lightweight, easy to use, and easy to understand. Pushrod draws inspiration from 16-bit GUI-based systems and other GUI libraries over the years.

Dependencies

Pushrod uses the following dependencies:

[dependencies]
piston_window = "^0.89.0"
find_folder = "^0.3.0"

To use the crate in your project, add the following dependencies:

[dependencies]
rust-pushrod = "^0.2"

Core Components

pushrod::core is the core library components, representing the main run loop, the callback store mechanism, and the widget store.

pushrod::event is the event system, in the works for 0.2.x.

pushrod::widget is the core Widget library.

Events

Coming soon.

Callbacks

Callbacks are introduced in the Widget libraries as a way to action upon an event that was triggered. If no callback is registered for a particular event, it is bypassed, and no default action occurs.

The following callbacks are available:

• Main window resizing
• Main window (un)focusing
• Mouse pointer entering a Widget
• Mouse pointer exiting a Widget
• Mouse pointer moving inside a Widget
• Mouse scrolling a mouse wheel inside a Widget
• A keyboard press event happening inside a Widget
• Mouse button click down inside the scope of a Widget
• Mouse button click release inside and outside of a Widget

Widgets

The following Widget objects are provided:

BaseWidget is a top-level Widget object. It can be configured with an origin, size, and background color. If you wish to design your own Widget, you would want to either extend the BaseWidget, or use it as a backing in your own Widget object. (See BoxWidget for an example of how to use it in tandem with another object.)

BoxWidget incorporates a BaseWidget, extending it to include a border color and width.

TextWidget provides a way to display text in the main window. Fonts are in ttf format, which can be downloaded from Google, so long as they are free/open source. One has been included with the source distribution in the assets directory.

TimerWidget provides a rudimentary timer, which increases ticks based on the screen refresh. After a timer has expired, a callback is triggered, allowing an action to occur.

ImageWidget draws an image on the screen. png format has been tested, but jpg and gif formats should also work, as they are part of the Piston library.

PushButtonWidget draws a BoxWidget, overlaying text on the top of it, justified in any direction you desired (Left, Center, Right) It produces an on_clicked callback when a click is detected (with the left mouse button) inside the bounds of the widget (ie. it overrides the mouse button click inside event.)

ToggleButtonWidget operates the same as a PushButtonWidget, but offers the ability to toggle selected state. on_selected is the callback that is triggered with the selected state returned.

ProgressWidget draws a progress bar on the screen, with a BoxWidget as its base. The color of the progress bar and its background can be changed at any time.

Modules

core	Main module containing the run loop for the UI components, containers for windows and Widget trait objects, and so on. Contains the core elements required to build a UI.
event	Companion module used to define and trigger system-wide events. Uses an event masking style similar to the Atari ST GEM series: event masks can be used to tell the Pushrod run loop which events the programmer desires to receive.
widget	Widget library used for on-screen UI interaction. This is a core set of Widget objects that are used to allow users to interact with an application. Contains a core set of widgets that can be extended.