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//! Platform → composition environment plumbing shared by every shell.
//!
//! The platform drivers (desktop, android, ios, web) publish live environment
//! values here — safe-area insets, soft-keyboard insets, the OS light/dark
//! theme — and wrap the app's root content in one provider that re-reads them
//! on every root render. A plain shared cell is not reactive on its own, so a
//! driver that changes a value must force a root render (for example
//! `AppShell::request_root_render`) for composition to observe it.
use cranpose_services::{set_platform_system_theme, SystemTheme};
use cranpose_ui::{local_ime_insets, local_safe_area_insets, EdgeInsets};
use std::cell::Cell;
use std::rc::Rc;
/// Live environment values a platform driver feeds into composition.
#[derive(Default)]
pub(crate) struct PlatformEnvironment {
safe_area: Cell<EdgeInsets>,
ime_insets: Cell<EdgeInsets>,
}
impl PlatformEnvironment {
pub(crate) fn new() -> Rc<Self> {
Rc::new(Self::default())
}
/// Update the safe-area insets. Returns true when the value changed and a
/// root render is required. (Only mobile drivers publish non-zero insets.)
#[cfg_attr(not(any(target_os = "android", target_os = "ios")), allow(dead_code))]
pub(crate) fn set_safe_area(&self, insets: EdgeInsets) -> bool {
let changed = self.safe_area.get() != insets;
self.safe_area.set(insets);
changed
}
/// Update the soft-keyboard insets. Returns true when the value changed
/// and a root render is required. (Only mobile drivers publish non-zero
/// insets.)
#[cfg_attr(not(any(target_os = "android", target_os = "ios")), allow(dead_code))]
pub(crate) fn set_ime_insets(&self, insets: EdgeInsets) -> bool {
let changed = self.ime_insets.get() != insets;
self.ime_insets.set(insets);
changed
}
/// Record the OS-reported theme. Returns true when it changed and a root
/// render is required. The value flows through
/// [`cranpose_services::default_system_theme`], so both the composition
/// local and plain accessor observe it.
pub(crate) fn set_system_theme(&self, theme: SystemTheme) -> bool {
let changed = cranpose_services::default_system_theme() != theme;
set_platform_system_theme(theme);
changed
}
/// Wrap the app's root content with the environment providers. Platform
/// drivers call this inside the shell's root closure.
pub(crate) fn compose_root(&self, content: impl FnOnce()) {
let theme = cranpose_services::default_system_theme();
// Cloning a shared snapshot handle, not re-reading the launch payload:
// the Android backend swaps the whole snapshot when a new intent
// arrives, so this picks the replacement up on the next root render.
let launch_args = cranpose_services::launch_args();
cranpose_core::CompositionLocalProvider(
vec![
local_safe_area_insets().provides(self.safe_area.get()),
local_ime_insets().provides(self.ime_insets.get()),
cranpose_services::local_system_theme().provides(theme),
cranpose_services::local_launch_args().provides(launch_args),
],
content,
);
}
}