Release 0.1 - Custom styling, event subscriptions, additional widgets, new examples, and more!

[hecrj]

Iced is an experimental cross-platform GUI library for Rust focused on simplicity and type-safety. Inspired by Elm.

This PR marks the end of the 0.1.0 milestone and the launch of a new release!
The library has made some progress since the last 0.1.0-beta landed, around 4 months ago.

New features

During this time, we have been focusing on implementing basic functionality and new widgets while following the roadmap. The most important new features are:

• Custom styling (Custom styling #146)
  A simple, trait-based approach for customizing the appearance of different widgets.

• Event subscriptions (Event subscriptions #122)
  A declarative way to listen to external events asynchronously by leveraging streams.

• Canvas widget (Canvas widget for 2D graphics #193)
  A widget for drawing 2D graphics with an interface inspired by the Web Canvas API and powered by lyon.

• PaneGrid widget (Pane grid widget #224)
  A widget that dynamically organizes layout by splitting panes that can be resized and drag and dropped.

• Svg widget (Svg and icon support #111)
  A widget that renders vector graphics on top of resvg and raqote. Thanks to @Maldela!

• ProgressBar widget (Progress bar widget #141)
  A widget to notify progress of asynchronous tasks to your users. Thanks to @Songtronix!

• Configurable futures executor (Custom futures executor with iced_futures #164)
  Support for plugging tokio, async-std, wasm-bindgen-futures, or your own custom futures executor to an application.

• Compatibility with existing wgpu projects (Integration with existing wgpu projects #183)
  A bunch of improvements to the flexibility of iced_wgpu to allow integration in existing codebases.

• Text selection for TextInput (Text Selection for text_input widget #202)
  Thanks to @FabianLars and @Finnerale!

• Texture atlas for iced_wgpu (Texture atlas #154)
  An atlas on top of guillotiere for batching draw calls. Thanks to @Maldela!

More examples

Back when I released the first beta, the codebase only had two examples: a simple tour showcasing the different widgets of the library, and a todos tracker inspired by TodoMVC. Since then, and as a consequence of all the new features, the amount of examples has increased considerably:

• bezier_tool, a Paint-like tool for drawing Bézier curves using lyon.
• clock, an application that uses the Canvas widget to draw a clock and its hands to display the current time.
• counter, the classic counter example explained in the README.
• custom_widget, a custom widget that draws a circle.
• download_progress, a basic application that asynchronously downloads a dummy file of 100 MB and tracks the download progress.
• events, a log of native events displayed using a conditional Subscription.
• geometry, a custom widget showcasing how to draw geometry with the Mesh2D primitive in iced_wgpu.
• integration, an example demonstrating how to integrate Iced in an existing graphical application.
• pane_grid, a grid of panes that can be split, resized, and reorganized.
• pokedex, an application that displays a random Pokédex entry (sprite included!) by using the PokéAPI.
• progress_bar, a simple progress bar that can be filled by using a slider.
• styling, an example showcasing custom styling with a light and dark theme.
• solar_system, an animated solar system drawn using the Canvas widget and showcasing how to compose different transforms.
• stopwatch, a watch with start/stop and reset buttons showcasing how to listen to time.
• svg, an application that renders the Ghostscript Tiger by leveraging the Svg widget.

Feel free to try them out and report any issues you may encounter!

Thank you! 🎉

Finally, I want to highlight the work of everyone that has contributed to the library in one way or another:

• @AlisCode created iced-pancurses, started a great issue to find a project logo (Iced branding #143), and worked on a potential website (#115).
• @artursapek contributed a Mesh2D primitive for iced_wgpu (Mesh2D primitive for rendering arbitrary geometry in iced_wgpu #140) which ended up being the foundations of the Canvas widget.
• @clarkmoody added customization support for the Checkbox widget (Customize Checkbox #192).
• @daxpedda improved the Node API (Add Node::move_to and make Node::align public #187) and has been working on the Grid widget (Grid widget #189).
• @ejmahler removed the Clone bound on the Message associated type of Application (Remove Clone bound on Application::Message #155).
• @FabianLars contributed text selection for TextInput (Text Selection for text_input widget #202) on top of @Finnerale's work.
• @Friz64 enhanced the scrolling behavior of the Scrollable widget (Make scrolling behave like you'd expect it to #95).
• @Gohla introduced missing style attributes in iced_web (Add several missing style attributes in iced_web #127), removed unnecessary bounds (Remove unnecessary bound in iced_web Container #128), and built a cool Space Engineers calculator.
• @hatoo added platform-specific settings to iced_winit (Improve window setting #94), implemented the bezier_tool example (Add MS paint example #144), and provided feedback related to using the library for building VST plugins (Allow setting initial state to Application on runtime? #118).
• @Imberflur updated winit to 0.21 (Update winit to 0.21 #181) and exposed the Clipboard type in iced_winit (Expose iced_winit::Clipboard #178).
• @kaimast removed unnecessary lifetimes in the integration example (remove explicit lifetimes in integration example #240) and contributed other minor code cleanups (Some more code cleanups. #242).
• @maaku fixed some formatting to comply with cargo fmt (Remove excess whitespace from end of line to comply with cargo fmt. #228).
• @Maldela implemented the Svg widget (Svg and icon support #111) and a texture atlas for iced_wgpu (Texture atlas #154).
• @memoryruins cleaned up some code and made it more idiomatic (Minor clean-up #45).
• @michael-swan implemented Ctrl+Backspace behavior for TextInput (Add Ctrl+Backspace text field behaviour #249).
• @mrkgnao added support for displaying already-decoded images (Add support for loading already-decoded image pixels #211).
• @nvzqz made a bunch of functions const (Make many functions const #91) and added some From implementations (Add From impls for Length, Point, and Size #92).
• @piaoger fixed the file path of the svg example (Fix sample file path for svg example #196).
• @Plecra improved the scaling of the hands in the clock example (Rework scaling in clock example #251).
• @rowungiles introduced a with_children method for Column and Row (Instantiate Column and Row with children #220).
• @Shootertrex fixed the hash_layout implementation of the Image widget (Added path to image hash so it updates when path changes #101).
• @simlay experimented with iOS support and touch events (Touch support #57) while contributing to winit.
• @Songtronix wrote the ProgressBar widget (Progress bar widget #141), contributed the download_progress example (Add example for download with progress tracking #232), and has been using the library in Airshipper, a cross-platform launcher for Veloren.
• @sumibi-yakitori enabled custom fonts for TextInput (Enable custom fonts for text input  #171).
• @tirz removed unnecessary 'static lifetimes in a bunch of generic types (refactor: remove not mandatories 'static lifetimes #245).

I am very grateful for all these contributions and all the feedback and suggestions received. Thank you, everyone!