Merge pull request #1748 from iced-rs/feature/software-renderer

Software renderer, runtime renderer fallback, and core consolidation

1 files changed, 33 insertions, 0 deletions

diff --git a/runtime/src/program.rs b/runtime/src/program.rs
new file mode 100644
index 00000000..44585cc5
--- /dev/null
+++ b/runtime/src/program.rs
@@ -0,0 +1,33 @@
+//! Build interactive programs using The Elm Architecture.
+use crate::Command;
+
+use iced_core::text;
+use iced_core::{Element, Renderer};
+
+mod state;
+
+pub use state::State;
+
+/// The core of a user interface application following The Elm Architecture.
+pub trait Program: Sized {
+    /// The graphics backend to use to draw the [`Program`].
+    type Renderer: Renderer + text::Renderer;
+
+    /// The type of __messages__ your [`Program`] will produce.
+    type Message: std::fmt::Debug + Send;
+
+    /// Handles a __message__ and updates the state of the [`Program`].
+    ///
+    /// This is where you define your __update logic__. All the __messages__,
+    /// produced by either user interactions or commands, will be handled by
+    /// this method.
+    ///
+    /// Any [`Command`] returned will be executed immediately in the
+    /// background by shells.
+    fn update(&mut self, message: Self::Message) -> Command<Self::Message>;
+
+    /// Returns the widgets to display in the [`Program`].
+    ///
+    /// These widgets can produce __messages__ based on user interaction.
+    fn view(&self) -> Element<'_, Self::Message, Self::Renderer>;
+}