Struct WindowStateDetector 

pub struct WindowStateDetector { /* private fields */ }

Tracks the current WindowState based on incoming winit WindowEvents.

The detector maps raw winit events to high-level window states and exposes helpers for render-loop decisions ([should_render], [control_flow]).

Usage

use cvkg_render_native::{WindowStateDetector, WindowState};
let mut detector = WindowStateDetector::new();
// In your event loop:
// if let Some(new_state) = detector.update_from_event(&event) { ... }

Implementations

impl WindowStateDetector

pub fn new() -> Self

Creates a new detector initialized to WindowState::Normal.

pub fn state(&self) -> WindowState

Returns the current window state.

pub fn is_key(&self) -> bool

Returns whether the window is the key (first responder) window.

pub fn is_main(&self) -> bool

Returns whether the window is the main window.

pub fn update_from_event(&mut self, event: &WindowEvent) -> Option<WindowState>

Updates the internal state based on a winit WindowEvent.

Returns Some(WindowState) if the state changed, None otherwise.

State mapping

winit event	resulting state
Occluded(true)	Occluded
Focused(true)	updates is_key; checks fullscreen
Focused(false)	updates is_key
Default	Normal

Note: Minimized and Fullscreen detection requires querying the winit Window directly (see [update_from_window]).

pub fn update_from_window(&mut self, window: &Window) -> Option<WindowState>

Updates the state by querying the winit Window directly.

This should be called once per frame to detect states that winit does not emit as events (minimized, fullscreen).

Returns Some(WindowState) if the state changed, None otherwise.

pub fn should_render(&self) -> bool

Returns true if the window should render a frame in the current state.

Returns false for WindowState::Occluded, WindowState::Minimized, and WindowState::Hidden.

pub fn control_flow(&self) -> ControlFlow

Returns the appropriate ControlFlow for the current state.

Non-rendering states get ControlFlow::Wait (save CPU cycles); rendering states get ControlFlow::Poll for maximum responsiveness.

Trait Implementations

impl Default for WindowStateDetector

fn default() -> Self

Returns the “default value” for a type.