azul-core 0.0.16

//! Window configuration types, input state, and platform-specific options.
//!
//! This module defines the core types used by the windowing system:
//!
//! - **Window configuration**: [`WindowSize`], [`WindowFlags`], [`WindowPosition`],
//!   [`RendererOptions`], [`PlatformSpecificOptions`]
//! - **Input state**: [`KeyboardState`], [`MouseState`], [`TouchState`], [`CursorPosition`]
//! - **Monitor/display info**: [`Monitor`], [`MonitorId`], [`VideoMode`]
//! - **Virtual key codes**: [`VirtualKeyCode`], [`ScanCode`]
//! - **Window icons**: [`WindowIcon`], [`TaskBarIcon`]
//! - **Platform options**: [`WindowsWindowOptions`], [`LinuxWindowOptions`],
//!   [`MacWindowOptions`], [`WasmWindowOptions`]
//!
//! These types are consumed by the platform shell backends in
//! `dll/src/desktop/shell2/{windows,macos,linux}/` and by
//! `layout/src/window_state.rs` for state management.

#[cfg(not(feature = "std"))]
use alloc::string::{String, ToString};
use alloc::{
    boxed::Box,
    collections::{btree_map::BTreeMap, btree_set::BTreeSet},
    vec::Vec,
};
use core::{
    cmp::Ordering,
    ffi::c_void,
    hash::{Hash, Hasher},
    ops,
    sync::atomic::{AtomicI64, AtomicUsize, Ordering as AtomicOrdering},
};

use azul_css::{
    css::CssPath,
    props::{
        basic::{ColorU, FloatValue, LayoutPoint, LayoutRect, LayoutSize},
        property::CssProperty,
    },
    AzString, LayoutDebugMessage, OptionF32, OptionI32, OptionString, OptionU32, U8Vec,
};
use rust_fontconfig::FcFontCache;

use crate::{
    callbacks::{LayoutCallback, LayoutCallbackType, Update},
    dom::{DomId, DomNodeId, NodeHierarchy},
    geom::{
        LogicalPosition, LogicalRect, LogicalSize, OptionLogicalSize, PhysicalPositionI32,
        PhysicalSize,
    },
    gl::OptionGlContextPtr,
    hit_test::{ExternalScrollId, OverflowingScrollNode},
    id::{NodeDataContainer, NodeId},
    refany::OptionRefAny,
    resources::{
        DpiScaleFactor, Epoch, GlTextureCache, IdNamespace, ImageCache, ImageMask, ImageRef,
        RendererResources, ResourceUpdate,
    },
    selection::SelectionState,
    styled_dom::NodeHierarchyItemId,
    task::{Instant, ThreadId, TimerId},
    FastBTreeSet, OrderedMap,
};

pub const DEFAULT_TITLE: &str = "Azul App";

static LAST_WINDOW_ID: AtomicI64 = AtomicI64::new(0);

/// Unique identifier for a window, auto-assigned via atomic counter.
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, Ord, PartialOrd)]
#[repr(transparent)]
pub struct WindowId {
    pub id: i64,
}

impl Default for WindowId {
    fn default() -> Self {
        Self::new()
    }
}

impl WindowId {
    pub fn new() -> Self {
        Self {
            id: LAST_WINDOW_ID.fetch_add(1, AtomicOrdering::SeqCst),
        }
    }
}

static LAST_ICON_KEY: AtomicUsize = AtomicUsize::new(0);

/// Key that is used for checking whether a window icon has changed -
/// this way azul doesn't need to diff the actual bytes, just the icon key.
/// Use `IconKey::new()` to generate a new, unique key
#[derive(Debug, Copy, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
#[repr(C)]
pub struct IconKey {
    icon_id: usize,
}

impl Default for IconKey {
    fn default() -> Self {
        Self::new()
    }
}

impl IconKey {
    pub fn new() -> Self {
        Self {
            icon_id: LAST_ICON_KEY.fetch_add(1, AtomicOrdering::SeqCst),
        }
    }
}

#[repr(C)]
#[derive(PartialEq, Copy, Clone, Debug, PartialOrd, Ord, Eq, Hash)]
pub struct RendererOptions {
    pub vsync: Vsync,
    pub srgb: Srgb,
    pub hw_accel: HwAcceleration,
}

impl_option!(
    RendererOptions,
    OptionRendererOptions,
    [PartialEq, Copy, Clone, Debug, PartialOrd, Ord, Eq, Hash]
);

impl Default for RendererOptions {
    fn default() -> Self {
        Self {
            vsync: Vsync::Enabled,
            srgb: Srgb::Disabled,
            // DontCare defers the choice to AZ_BACKEND / the desktop default,
            // which is now CPU (software) rendering on all platforms — matching
            // what the headless e2e tests render. GPU is re-selectable via
            // AZ_BACKEND=gpu / AZ_BACKEND=auto or HwAcceleration::Enabled.
            hw_accel: HwAcceleration::DontCare,
        }
    }
}

impl RendererOptions {
    #[must_use]
    pub const fn new(vsync: Vsync, srgb: Srgb, hw_accel: HwAcceleration) -> Self {
        Self {
            vsync,
            srgb,
            hw_accel,
        }
    }
}

#[repr(C)]
#[derive(PartialEq, Copy, Clone, Debug, PartialOrd, Ord, Eq, Hash)]
pub enum Vsync {
    Enabled,
    Disabled,
    DontCare,
}

impl Vsync {
    #[must_use]
    pub const fn is_enabled(&self) -> bool {
        matches!(self, Self::Enabled)
    }
}

#[repr(C)]
#[derive(PartialEq, Copy, Clone, Debug, PartialOrd, Ord, Eq, Hash)]
pub enum Srgb {
    Enabled,
    Disabled,
    DontCare,
}
impl Srgb {
    #[must_use]
    pub const fn is_enabled(&self) -> bool {
        matches!(self, Self::Enabled)
    }
}

#[repr(C)]
#[derive(PartialEq, Copy, Clone, Debug, PartialOrd, Ord, Eq, Hash)]
pub enum HwAcceleration {
    Enabled,
    Disabled,
    DontCare,
}
impl HwAcceleration {
    #[must_use]
    pub const fn is_enabled(&self) -> bool {
        matches!(self, Self::Enabled)
    }
}

#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C, u8)]
pub enum RawWindowHandle {
    IOS(IOSHandle),
    MacOS(MacOSHandle),
    Xlib(XlibHandle),
    Xcb(XcbHandle),
    Wayland(WaylandHandle),
    Windows(WindowsHandle),
    Web(WebHandle),
    Android(AndroidHandle),
    Unsupported,
}

// SAFETY: RawWindowHandle contains raw pointers that are only used as opaque
// identifiers for platform window handles. The handle values are not
// dereferenced across threads; they are passed to platform APIs on the main thread.
unsafe impl Send for RawWindowHandle {}

#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub struct IOSHandle {
    pub ui_window: *mut c_void,
    pub ui_view: *mut c_void,
    pub ui_view_controller: *mut c_void,
}

#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub struct MacOSHandle {
    pub ns_window: *mut c_void,
    pub ns_view: *mut c_void,
}

#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub struct XlibHandle {
    /// An Xlib Window
    pub window: u64,
    pub display: *mut c_void,
}

#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub struct XcbHandle {
    /// An X11 `xcb_window_t`.
    pub window: u32,
    /// A pointer to an X server `xcb_connection_t`.
    pub connection: *mut c_void,
}

#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub struct WaylandHandle {
    /// A pointer to a `wl_surface`
    pub surface: *mut c_void,
    /// A pointer to a `wl_display`.
    pub display: *mut c_void,
}

#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub struct WindowsHandle {
    /// A Win32 HWND handle.
    pub hwnd: *mut c_void,
    /// The HINSTANCE associated with this type's HWND.
    pub hinstance: *mut c_void,
}

#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub struct WebHandle {
    /// An ID value inserted into the data attributes of the canvas element as 'raw-handle'
    ///
    /// When accessing from JS, the attribute will automatically be called rawHandle. Each canvas
    /// created by the windowing system should be assigned their own unique ID.
    /// 0 should be reserved for invalid / null IDs.
    pub id: u32,
}

#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub struct AndroidHandle {
    /// A pointer to an `ANativeWindow`.
    pub a_native_window: *mut c_void,
}

#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
#[derive(Default)]
pub enum MouseCursorType {
    #[default]
    Default,
    Crosshair,
    Hand,
    Arrow,
    Move,
    Text,
    Wait,
    Help,
    Progress,
    NotAllowed,
    ContextMenu,
    Cell,
    VerticalText,
    Alias,
    Copy,
    NoDrop,
    Grab,
    Grabbing,
    AllScroll,
    ZoomIn,
    ZoomOut,
    EResize,
    NResize,
    NeResize,
    NwResize,
    SResize,
    SeResize,
    SwResize,
    WResize,
    EwResize,
    NsResize,
    NeswResize,
    NwseResize,
    ColResize,
    RowResize,
}

/// Hardware-dependent keyboard scan code.
pub type ScanCode = u32;

/// Which lock keys are currently engaged.
///
/// Not modifiers: a modifier is held, a lock is toggled, and an app that wants
/// to warn "Caps Lock is on" in a password field needs the toggle state, which
/// no key event carries.
#[derive(Debug, Copy, Clone, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub struct KeyLocks {
    pub caps_lock: bool,
    pub num_lock: bool,
    pub scroll_lock: bool,
}

/// A key identified by its PHYSICAL POSITION, independent of layout.
///
/// The companion to [`VirtualKeyCode`], which is the LOGICAL key — what the
/// user's layout says that position produces. Every modern stack splits these
/// because they answer different questions: `KeyboardEvent.code` vs `.key` on
/// the web, `PhysicalKey` vs `Key` in winit.
///
/// `ScanCode` already carried the physical key as a raw `u32`, but a raw
/// scancode is platform-specific and unnameable — an app cannot write
/// `if scancode == 17` and mean anything portable. This is the same
/// information in a form that can be matched on.
///
/// Names follow the W3C UI Events `code` values, which name each position by
/// what it produces on US ANSI. `KeyW` is "the key where W sits on a US
/// board" — on AZERTY the user sees Z there, and a game binding "forward"
/// wants that position regardless.
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub enum PhysicalKey {
    /// The platform reported a position this enum does not name.
    Unidentified,
    // Letters — POSITIONAL. `KeyW` is the key where W sits on US ANSI,
    // wherever the user's layout maps it: on AZERTY that key produces Z, and
    // a first-person game binding "forward" wants the position, not the
    // letter, which is the whole reason this enum exists alongside
    // `VirtualKeyCode`.
    KeyA, KeyB, KeyC, KeyD, KeyE, KeyF, KeyG, KeyH, KeyI, KeyJ, KeyK, KeyL, KeyM,
    KeyN, KeyO, KeyP, KeyQ, KeyR, KeyS, KeyT, KeyU, KeyV, KeyW, KeyX, KeyY, KeyZ,
    // Number row.
    Digit0, Digit1, Digit2, Digit3, Digit4, Digit5, Digit6, Digit7, Digit8, Digit9,
    // Punctuation, by position on the US ANSI board.
    Backquote, Minus, Equal, BracketLeft, BracketRight, Backslash,
    Semicolon, Quote, Comma, Period, Slash,
    // Whitespace and editing.
    Enter, Tab, Space, Backspace, Escape, CapsLock,
    // Modifiers, LEFT and RIGHT distinguished — which `VirtualKeyCode` can do
    // but `KeyModifiers` deliberately cannot, since a shortcut cares that
    // Shift is down and a game may care which one.
    ShiftLeft, ShiftRight, ControlLeft, ControlRight,
    AltLeft, AltRight, MetaLeft, MetaRight, ContextMenu,
    // Navigation.
    Insert, Delete, Home, End, PageUp, PageDown,
    ArrowUp, ArrowDown, ArrowLeft, ArrowRight,
    // Function row.
    F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12,
    F13, F14, F15, F16, F17, F18, F19, F20, F21, F22, F23, F24,
    // System.
    PrintScreen, ScrollLock, Pause,
    // Numpad — always positional, and distinct from the number row even when
    // both produce the same character.
    NumLock, NumpadDivide, NumpadMultiply, NumpadSubtract, NumpadAdd,
    NumpadEnter, NumpadDecimal, NumpadComma, NumpadEqual,
    Numpad0, Numpad1, Numpad2, Numpad3, Numpad4,
    Numpad5, Numpad6, Numpad7, Numpad8, Numpad9,
    // ISO/JIS keys that ANSI boards do not have.
    IntlBackslash, IntlRo, IntlYen, Lang1, Lang2, Convert, NonConvert, KanaMode,
}

/// Determines which keys are pressed currently (modifiers, etc.)
#[derive(Default, Debug, Clone, PartialEq, Eq)]
#[repr(C)]
pub struct KeyboardState {
    /// Currently pressed virtual keycode - **DO NOT USE THIS FOR TEXT INPUT**.
    ///
    /// For text input, use the `text_input` parameter in callbacks.
    /// For example entering `à` will fire a `VirtualKeyCode::Grave`, then `VirtualKeyCode::A`,
    /// so to correctly combine characters, the framework handles text composition internally.
    pub current_virtual_keycode: OptionVirtualKeyCode,
    /// Currently pressed virtual keycodes (READONLY) - it can happen that more than one key is
    /// pressed
    ///
    /// This is essentially an "extension" of `current_scancodes` - `current_keys` stores the
    /// characters, but what if the pressed key is not a character (such as `ArrowRight` or
    /// `PgUp`)?
    ///
    /// Note that this can have an overlap, so pressing "a" on the keyboard will insert
    /// both a `VirtualKeyCode::A` into `current_virtual_keycodes` and text input will be handled
    /// by the framework automatically for contenteditable nodes.
    pub pressed_virtual_keycodes: VirtualKeyCodeVec,
    /// Same as `current_virtual_keycodes`, but the scancode identifies the physical key pressed,
    /// independent of the keyboard layout. The scancode does not change if the user adjusts the
    /// host's keyboard map. Use when the physical location of the key is more important than
    /// the key's host GUI semantics, such as for movement controls in a first-person game
    /// (German keyboard: Z key, UK keyboard: Y key, etc.)
    pub pressed_scancodes: ScanCodeVec,
    /// Which modifiers are held right now. (READONLY)
    ///
    /// Derivable from `pressed_virtual_keycodes` by scanning for the six
    /// modifier keycodes, which is what every caller was doing. Carrying it
    /// directly makes the common check cheap and makes `ModifiersChanged`
    /// possible to emit at all.
    pub modifiers: crate::events::KeyModifiers,
    /// Which lock keys are engaged. (READONLY)
    ///
    /// NOT derivable from the pressed set: a lock is a toggle, so it stays on
    /// after the key is released and no key event describes it. It has to be
    /// read from the OS.
    pub locks: KeyLocks,
    /// Whether the current key event is an auto-repeat rather than a fresh
    /// press. (READONLY)
    ///
    /// A text field wants repeats; a jump button does not, and without this
    /// the two are indistinguishable.
    pub is_repeat: bool,
    /// Physical position of the currently pressed key. (READONLY)
    pub current_physical_key: OptionPhysicalKey,
}

impl KeyboardState {
    #[must_use]
    pub fn shift_down(&self) -> bool {
        self.is_key_down(VirtualKeyCode::LShift) || self.is_key_down(VirtualKeyCode::RShift)
    }
    #[must_use]
    pub fn ctrl_down(&self) -> bool {
        self.is_key_down(VirtualKeyCode::LControl) || self.is_key_down(VirtualKeyCode::RControl)
    }
    #[must_use]
    pub fn alt_down(&self) -> bool {
        self.is_key_down(VirtualKeyCode::LAlt) || self.is_key_down(VirtualKeyCode::RAlt)
    }
    #[must_use]
    pub fn super_down(&self) -> bool {
        self.is_key_down(VirtualKeyCode::LWin) || self.is_key_down(VirtualKeyCode::RWin)
    }
    /// The platform's PRIMARY shortcut modifier: Cmd (super) on macOS, Ctrl
    /// everywhere else (MWA-A2). Every standard editing shortcut
    /// (copy / cut / paste / select-all / undo / redo) keys off this —
    /// hardcoding `ctrl_down()` made Cmd+C/X/V/A/Z dead on macOS, where Cmd
    /// arrives as LWin/super.
    #[must_use]
    pub fn primary_down(&self) -> bool {
        if cfg!(target_os = "macos") {
            self.super_down()
        } else {
            self.ctrl_down()
        }
    }
    #[must_use]
    pub fn is_key_down(&self, key: VirtualKeyCode) -> bool {
        self.pressed_virtual_keycodes.iter().any(|k| *k == key)
    }

    /// The modifier set implied by the keys currently held.
    ///
    /// `modifiers` is a stored field because callbacks read it directly and
    /// `ModifiersChanged` diffs against it, but its VALUE is a pure function
    /// of the pressed set — so it must never be assigned independently, only
    /// recomputed from here.
    #[must_use]
    pub fn derived_modifiers(&self) -> crate::events::KeyModifiers {
        crate::events::KeyModifiers {
            shift: self.shift_down(),
            ctrl: self.ctrl_down(),
            alt: self.alt_down(),
            meta: self.super_down(),
        }
    }

    /// Bring `modifiers` back in step with the pressed set.
    ///
    /// Call this after ANY change to `pressed_virtual_keycodes`. Nothing did,
    /// on any backend, so `modifiers` sat at its default: every callback that
    /// read it saw "no modifiers held" no matter what was down, and
    /// `ModifiersChanged` could never fire because the diff compared two
    /// identical defaults. The derived accessors (`shift_down()` and friends)
    /// were right the whole time, which is why shortcuts still worked and the
    /// gap stayed invisible.
    pub fn sync_modifiers(&mut self) {
        self.modifiers = self.derived_modifiers();
    }

    /// Returns `true` iff every entry of `chord` is currently active in this
    /// keyboard state. Used by accelerator/keymap registrations to evaluate
    /// shortcuts like `[Ctrl, Shift, Key(VirtualKeyCode::S)]`.
    ///
    /// An empty chord matches trivially.
    #[must_use]
    pub fn matches_accelerator(&self, chord: &[AcceleratorKey]) -> bool {
        chord.iter().all(|a| a.matches(self))
    }
}

impl_option!(
    KeyboardState,
    OptionKeyboardState,
    copy = false,
    [Debug, Clone, PartialEq, Eq]
);

// char is not ABI-stable, use u32 instead
impl_option!(
    u32,
    OptionChar,
    [Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash]
);
impl_option!(
    VirtualKeyCode,
    OptionVirtualKeyCode,
    [Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash]
);
impl_option!(
    PhysicalKey,
    OptionPhysicalKey,
    [Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash]
);

impl_vec!(
    VirtualKeyCode,
    VirtualKeyCodeVec,
    VirtualKeyCodeVecDestructor,
    VirtualKeyCodeVecDestructorType,
    VirtualKeyCodeVecSlice,
    OptionVirtualKeyCode
);
impl_vec_debug!(VirtualKeyCode, VirtualKeyCodeVec);
impl_vec_partialord!(VirtualKeyCode, VirtualKeyCodeVec);
impl_vec_ord!(VirtualKeyCode, VirtualKeyCodeVec);
impl_vec_clone!(
    VirtualKeyCode,
    VirtualKeyCodeVec,
    VirtualKeyCodeVecDestructor
);
impl_vec_partialeq!(VirtualKeyCode, VirtualKeyCodeVec);
impl_vec_eq!(VirtualKeyCode, VirtualKeyCodeVec);
impl_vec_hash!(VirtualKeyCode, VirtualKeyCodeVec);
impl_vec_mut!(VirtualKeyCode, VirtualKeyCodeVec);

impl_vec_as_hashmap!(VirtualKeyCode, VirtualKeyCodeVec);

impl_vec!(
    ScanCode,
    ScanCodeVec,
    ScanCodeVecDestructor,
    ScanCodeVecDestructorType,
    ScanCodeVecSlice,
    OptionU32
);
impl_vec_debug!(ScanCode, ScanCodeVec);
impl_vec_partialord!(ScanCode, ScanCodeVec);
impl_vec_ord!(ScanCode, ScanCodeVec);
impl_vec_clone!(ScanCode, ScanCodeVec, ScanCodeVecDestructor);
impl_vec_partialeq!(ScanCode, ScanCodeVec);
impl_vec_eq!(ScanCode, ScanCodeVec);
impl_vec_hash!(ScanCode, ScanCodeVec);
impl_vec_mut!(ScanCode, ScanCodeVec);

impl_vec_as_hashmap!(ScanCode, ScanCodeVec);

/// Mouse position, cursor type, user scroll input, etc.
#[derive(Debug, Copy, Clone, PartialOrd, PartialEq, Eq)]
#[repr(C)]
pub struct MouseState {
    // Field order is by DECREASING ALIGNMENT, not by topic. `#[repr(C)]` lays
    // these out literally, so the u64 has to lead and the five bools have to
    // trail — the previous grouping cost ~8 bytes of padding per instance,
    // and this struct is copied every mouse move.
    /// Which physical pointing device is driving, or `0` when the platform
    /// does not say. (READONLY)
    pub pointer_device_id: u64,
    /// Where is the mouse cursor currently? Set to `None` if the window is not focused.
    /// (READWRITE)
    pub cursor_position: CursorPosition,
    /// Current mouse cursor type, set to `None` if the cursor is hidden. (READWRITE)
    pub mouse_cursor_type: OptionMouseCursorType,
    /// What kind of device is currently driving the pointer. (READONLY)
    ///
    /// On `MouseState` rather than on the event because it is a property of
    /// the DEVICE, not of one motion — an app can ask "is this a trackpad?"
    /// from any callback, not only from inside a pointer handler.
    pub pointer_source: crate::events::PointerSource,
    /// Is the mouse cursor locked to the current window (important for applications like games)?
    /// (READWRITE)
    pub is_cursor_locked: bool,
    /// Is the left mouse button down? (READONLY)
    pub left_down: bool,
    /// Is the right mouse button down? (READONLY)
    pub right_down: bool,
    /// Is the middle mouse button down? (READONLY)
    pub middle_down: bool,
    /// Bitmask of the thumb buttons currently held. (READONLY)
    ///
    /// A bitmask rather than two bools because the set is open-ended: a mouse
    /// can report buttons past forward, and the shells already carry them as
    /// `MouseButton::Other(n)`. Bit 0 is back, bit 1 is forward — see
    /// `MOUSE_OTHER_MASK_BACK` / `MOUSE_OTHER_MASK_FORWARD`; use
    /// [`MouseState::back_down`] and [`MouseState::forward_down`] rather than
    /// testing bits by hand.
    pub other_down: u8,
}


impl MouseState {
    /// Whether the thumb "back" button is held.
    #[must_use]
    pub const fn back_down(&self) -> bool {
        self.other_down & crate::events::MOUSE_OTHER_MASK_BACK != 0
    }

    /// Whether the thumb "forward" button is held.
    #[must_use]
    pub const fn forward_down(&self) -> bool {
        self.other_down & crate::events::MOUSE_OTHER_MASK_FORWARD != 0
    }

    #[must_use]
    pub const fn matches(&self, context: &ContextMenuMouseButton) -> bool {
        use self::ContextMenuMouseButton::{Left, Middle, Right};
        match context {
            Left => self.left_down,
            Right => self.right_down,
            Middle => self.middle_down,
        }
    }
}

impl_option!(
    MouseState,
    OptionMouseState,
    [Debug, Copy, Clone, PartialEq, Eq, PartialOrd]
);

impl_option!(
    MouseCursorType,
    OptionMouseCursorType,
    [Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash]
);

impl Default for MouseState {
    fn default() -> Self {
        Self {
            mouse_cursor_type: Some(MouseCursorType::Default).into(),
            cursor_position: CursorPosition::default(),
            is_cursor_locked: false,
            left_down: false,
            right_down: false,
            middle_down: false,
            other_down: 0,
            pointer_source: crate::events::PointerSource::Unknown,
            pointer_device_id: 0,
        }
    }
}

/// The seat id of the PRIMARY pointer - the one `FullWindowState::mouse_state`
/// describes. Every platform has exactly this seat; most have only it.
pub const PRIMARY_POINTER_SEAT: u64 = 0;

/// One ADDITIONAL pointer seat (9b-ii): an independent cursor with its own
/// position, buttons and hover, next to the primary one.
///
/// A SEAT is not a DEVICE. `MouseState::pointer_device_id` names the physical
/// hardware that last drove a cursor; a seat is the cursor itself. The
/// distinction is the whole design: on Windows, macOS, Android and iOS the OS
/// merges every mouse into ONE cursor, so two mice are two devices driving one
/// seat - a click from the second mouse after a move from the first lands
/// where the first left the cursor, because that IS where the cursor is.
/// Keying state by device would have split that one cursor into two entries
/// with different positions, and dispatched the click somewhere the user
/// could not see. Only X11 (MPX master pointers) and Wayland (one `wl_seat`
/// per user) can present a second cursor, and only there does a second entry
/// exist.
///
/// The primary seat is NOT in `pointer_seats`; it stays `mouse_state` so
/// every existing reader of "the mouse" keeps meaning what it meant.
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd)]
#[repr(C)]
pub struct PointerSeat {
    /// The platform's identity for this cursor - an X11 master pointer id,
    /// a Wayland seat's global name. Never [`PRIMARY_POINTER_SEAT`].
    pub seat_id: u64,
    /// The seat's own cursor state.
    pub state: MouseState,
}

impl_option!(
    PointerSeat,
    OptionPointerSeat,
    [Debug, Copy, Clone, PartialEq, Eq, PartialOrd]
);

impl_vec!(
    PointerSeat,
    PointerSeatVec,
    PointerSeatVecDestructor,
    PointerSeatVecDestructorType,
    PointerSeatVecSlice,
    OptionPointerSeat
);
impl_vec_debug!(PointerSeat, PointerSeatVec);
impl_vec_clone!(PointerSeat, PointerSeatVec, PointerSeatVecDestructor);
impl_vec_partialeq!(PointerSeat, PointerSeatVec);
impl_vec_mut!(PointerSeat, PointerSeatVec);

/// One NON-primary keyboard seat's state (9b-ii-a-i): the per-seat twin of
/// [`PointerSeat`]. X11 MPX pairs each master keyboard with a master
/// pointer, and a Wayland `wl_seat` carries both; the seat id is the same
/// number [`PointerSeat::seat_id`] uses for that pairing, so a keystroke and
/// a click from the same person carry the same seat. The primary seat's
/// keyboard is `FullWindowState::keyboard_state`, never listed here.
///
/// FOCUS IS SHARED: azul has one focused node, so every seat's keys reach
/// it (MPX's per-keyboard focus is not modelled - 9b-ii-a-i-d).
#[derive(Debug, Clone, PartialEq, Eq)]
#[repr(C)]
pub struct KeyboardSeat {
    /// The seat's identity - the same id as the seat's pointer. Never
    /// [`PRIMARY_POINTER_SEAT`].
    pub seat_id: u64,
    /// The seat's own keyboard state.
    pub state: KeyboardState,
}

impl_option!(
    KeyboardSeat,
    OptionKeyboardSeat,
    copy = false,
    [Debug, Clone, PartialEq, Eq]
);

impl_vec!(
    KeyboardSeat,
    KeyboardSeatVec,
    KeyboardSeatVecDestructor,
    KeyboardSeatVecDestructorType,
    KeyboardSeatVecSlice,
    OptionKeyboardSeat
);
impl_vec_debug!(KeyboardSeat, KeyboardSeatVec);
impl_vec_clone!(KeyboardSeat, KeyboardSeatVec, KeyboardSeatVecDestructor);
impl_vec_partialeq!(KeyboardSeat, KeyboardSeatVec);
impl_vec_mut!(KeyboardSeat, KeyboardSeatVec);

#[derive(Debug, Clone, PartialEq, PartialOrd, Hash, Eq, Ord)]
#[repr(C)]
pub struct VirtualKeyCodeCombo {
    pub keys: VirtualKeyCodeVec,
}

impl_option!(
    VirtualKeyCodeCombo,
    OptionVirtualKeyCodeCombo,
    copy = false,
    [Debug, Clone, PartialEq, PartialOrd, Hash, Eq, Ord]
);

#[derive(Debug, Copy, Clone, PartialEq, PartialOrd, Hash, Eq, Ord)]
#[repr(C)]
#[derive(Default)]
pub enum ContextMenuMouseButton {
    #[default]
    Right,
    Middle,
    Left,
}

impl MouseState {
    /// Returns whether any mouse button (left, right or center) is currently held down
    #[must_use]
    pub const fn mouse_down(&self) -> bool {
        self.right_down || self.left_down || self.middle_down
    }

    /// Snapshot the button-down flags as a `MouseButtonState` for drag tracking.
    #[must_use]
    pub const fn button_state(&self) -> crate::events::MouseButtonState {
        crate::events::MouseButtonState {
            left_down: self.left_down,
            right_down: self.right_down,
            middle_down: self.middle_down,
        }
    }
}

impl From<&MouseState> for crate::events::MouseButtonState {
    fn from(s: &MouseState) -> Self {
        s.button_state()
    }
}

impl crate::events::MouseButtonState {
    /// Returns true if any of the tracked buttons is held down.
    #[must_use]
    pub const fn any_down(&self) -> bool {
        self.left_down || self.right_down || self.middle_down
    }
}

/// Result of dispatching a scroll delta into the system scroll-handling pipeline.
///
/// Returned by [`process_system_scroll`]. Higher layers can use the
/// [`ScrollResult::remaining_delta`] to forward un-consumed scroll to a parent
/// container, and [`ScrollResult::hit_scrollbar`] to distinguish scrollbar-drag
/// scrolling from wheel-on-content scrolling for hit-testing purposes.
#[derive(Debug, Default, Copy, Clone, PartialEq, Eq, PartialOrd)]
#[repr(C)]
pub struct ScrollResult {
    /// Number of scrollable nodes whose offset was updated by this dispatch.
    pub scrolled_nodes: usize,
    /// Delta that could not be consumed (overscroll). May be forwarded to a parent.
    pub remaining_delta: LogicalPosition,
    /// `true` if the dispatch hit a native scrollbar (drag), `false` for wheel/touch.
    pub hit_scrollbar: bool,
}

/// Dispatch a system scroll event and return a [`ScrollResult`] describing what
/// happened.
///
/// This is the entry point used by headless integration tests and embedders that
/// drive scroll programmatically. The richer per-document scroll handling lives
/// in `LayoutWindow::process_scroll`; this helper packages a delta into a
/// `ScrollResult` for return to callers so the result type is observable from
/// the public API.
#[must_use]
pub fn process_system_scroll(delta: LogicalPosition, hit_scrollbar: bool) -> ScrollResult {
    let consumed = delta.x != 0.0 || delta.y != 0.0;
    ScrollResult {
        scrolled_nodes: usize::from(consumed),
        remaining_delta: LogicalPosition::zero(),
        hit_scrollbar,
    }
}

#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd)]
#[repr(C, u8)]
#[derive(Default)]
pub enum CursorPosition {
    OutOfWindow(LogicalPosition),
    #[default]
    Uninitialized,
    InWindow(LogicalPosition),
}

impl CursorPosition {
    #[must_use]
    pub const fn get_position(&self) -> Option<LogicalPosition> {
        match self {
            Self::InWindow(logical_pos) => Some(*logical_pos),
            Self::OutOfWindow(_) | Self::Uninitialized => None,
        }
    }

    #[must_use]
    pub const fn is_inside_window(&self) -> bool {
        self.get_position().is_some()
    }
}

/// Toggles webrender debug flags (will make stuff appear on
/// the screen that you might not want to - used for debugging purposes)
///
/// Every field here maps onto a `webrender::DebugFlags` bit except
/// `show_hit_test_areas`, which is azul's own overlay. Populate it from the
/// environment with [`DebugState::from_az_overlay_env`] — see that function for
/// the verb list and why the hit-test overlay is no longer `debug_assertions`-only.
#[derive(Default, Debug, Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
#[repr(C)]
pub struct DebugState {
    /// Paint a translucent red rectangle over every hit-test area.
    ///
    /// azul's own overlay, not a webrender flag: the compositor draws it while
    /// emitting `DisplayListItem::HitTestArea`, so it shows exactly the regions
    /// the hit tester will actually consider — which is the question you have
    /// when a click does nothing, or lands on the wrong node.
    pub show_hit_test_areas: bool,
    pub profiler_dbg: bool,
    pub render_target_dbg: bool,
    pub texture_cache_dbg: bool,
    pub gpu_time_queries: bool,
    pub gpu_sample_queries: bool,
    pub disable_batching: bool,
    pub epochs: bool,
    pub echo_driver_messages: bool,
    pub show_overdraw: bool,
    pub gpu_cache_dbg: bool,
    pub texture_cache_dbg_clear_evicted: bool,
    pub picture_caching_dbg: bool,
    pub primitive_dbg: bool,
    pub zoom_dbg: bool,
    pub small_screen: bool,
    pub disable_opaque_pass: bool,
    pub disable_alpha_pass: bool,
    pub disable_clip_masks: bool,
    pub disable_text_prims: bool,
    pub disable_gradient_prims: bool,
    pub obscure_images: bool,
    pub glyph_flashing: bool,
    pub smart_profiler: bool,
    pub invalidation_dbg: bool,
    pub tile_cache_logging_dbg: bool,
    pub profiler_capture: bool,
    pub force_picture_invalidation: bool,
}

impl DebugState {
    /// Build a `DebugState` from the `AZ_OVERLAY` environment variable.
    ///
    /// `AZ_OVERLAY` is a comma-separated list of verbs, e.g.
    ///
    /// ```text
    /// AZ_OVERLAY=hit-test
    /// AZ_OVERLAY=hit-test,overdraw,profiler
    /// AZ_OVERLAY=list          # print the verbs and exit-code nothing
    /// ```
    ///
    /// WHY THIS EXISTS: the hit-test overlay used to be `#[cfg(debug_assertions)]`
    /// in the compositor, so a debug build painted every hit-test area red and a
    /// release build painted none, with no way to ask for either. That is a
    /// debug/release divergence in VISUAL OUTPUT — running hello-world showed a
    /// red window and the reasonable first guess was "this linked the wrong
    /// DLL". It was not. An overlay you cannot turn on when you need it, and
    /// cannot turn off when you do not, is worse than no overlay.
    ///
    /// Available in RELEASE builds too, deliberately: the moment you need to see
    /// hit-test regions or overdraw is usually on the build a user is running.
    ///
    /// Unknown verbs are reported and ignored rather than fatal — a typo in a
    /// debugging aid must not stop the app you are trying to debug.
    /// Reading the environment needs std; on `no_std` there is no environment to
    /// read, so the overlay is simply off. `from_overlay_spec` stays available
    /// everywhere, so a `no_std` embedder can still enable overlays explicitly.
    #[cfg(feature = "std")]
    #[must_use]
    pub fn from_az_overlay_env() -> Self {
        std::env::var("AZ_OVERLAY")
            .map_or_else(|_| Self::default(), |v| Self::from_overlay_spec(v.as_str()))
    }

    /// `no_std`: there is no environment, so no overlay.
    #[cfg(not(feature = "std"))]
    #[must_use]
    pub fn from_az_overlay_env() -> Self {
        Self::default()
    }

    /// The parser behind [`DebugState::from_az_overlay_env`], separated so it is
    /// testable without touching the process environment.
    #[must_use]
    pub fn from_overlay_spec(spec: &str) -> Self {
        let mut s = Self::default();
        for raw in spec.split(',') {
            let verb = raw.trim().to_ascii_lowercase();
            if verb.is_empty() {
                continue;
            }
            match verb.as_str() {
                // azul's own overlay.
                "hit-test" | "hittest" => s.show_hit_test_areas = true,
                // webrender flags, named for what they SHOW rather than for the
                // flag constant, because the constant names are not obvious.
                "profiler" => s.profiler_dbg = true,
                "smart-profiler" => s.smart_profiler = true,
                "overdraw" => s.show_overdraw = true,
                "render-targets" => s.render_target_dbg = true,
                "texture-cache" => s.texture_cache_dbg = true,
                "gpu-cache" => s.gpu_cache_dbg = true,
                "picture-caching" => s.picture_caching_dbg = true,
                "primitives" => s.primitive_dbg = true,
                "invalidation" => s.invalidation_dbg = true,
                "epochs" => s.epochs = true,
                "zoom" => s.zoom_dbg = true,
                "glyph-flashing" => s.glyph_flashing = true,
                "obscure-images" => s.obscure_images = true,
                "gpu-time" => s.gpu_time_queries = true,
                "gpu-samples" => s.gpu_sample_queries = true,
                "echo-driver" => s.echo_driver_messages = true,
                // Diagnostic switches that DISABLE a stage — for bisecting which
                // stage is responsible for a visual artefact.
                "no-batching" => s.disable_batching = true,
                "no-opaque-pass" => s.disable_opaque_pass = true,
                "no-alpha-pass" => s.disable_alpha_pass = true,
                "no-clip-masks" => s.disable_clip_masks = true,
                "no-text" => s.disable_text_prims = true,
                "no-gradients" => s.disable_gradient_prims = true,
                "all" => {
                    s.show_hit_test_areas = true;
                    s.profiler_dbg = true;
                    s.show_overdraw = true;
                    s.primitive_dbg = true;
                }
                other => {
                    // Not fatal: a typo in a debugging aid must not stop the app.
                    #[cfg(feature = "std")]
                    eprintln!(
                        "[azul] AZ_OVERLAY: unknown verb {other:?}. Known: hit-test, profiler, \
                         smart-profiler, overdraw, render-targets, texture-cache, gpu-cache, \
                         picture-caching, primitives, invalidation, epochs, zoom, glyph-flashing, \
                         obscure-images, gpu-time, gpu-samples, echo-driver, no-batching, \
                         no-opaque-pass, no-alpha-pass, no-clip-masks, no-text, no-gradients, all"
                    );
                }
            }
        }
        s
    }
}

#[derive(Debug, Default, Clone, PartialEq)]
#[repr(C)]
pub struct TouchState {
    /// Number of active touch points (kept in sync with `touch_points.len()`).
    pub num_touches: usize,
    /// Currently active touch points (one entry per finger / stylus).
    /// Backends update this on touch start / move / end events.
    pub touch_points: TouchPointVec,
    /// Intermediate samples the OS captured BETWEEN this frame and the last,
    /// oldest first. APPENDED for ABI stability.
    ///
    /// A digitizer samples far faster than the display refreshes — 120 Hz or
    /// 240 Hz against 60 — and the OS delivers only the newest position per
    /// frame, because that is what a button or a scroll view wants. A drawing
    /// app wants all of them: a fast stroke rendered from one point per frame
    /// is a polyline with visible corners, and the samples that would have
    /// rounded it were captured and discarded.
    ///
    /// Empty when the platform does not report them, or when nothing moved
    /// between frames. The current `touch_points` entry is NOT repeated here.
    pub coalesced_points: TouchPointVec,
    /// Where the OS predicts the touch is about to go, oldest first.
    /// APPENDED for ABI stability.
    ///
    /// These are EXTRAPOLATIONS, not measurements, and they are wrong as
    /// often as the user changes direction. They exist to hide latency: a
    /// stroke drawn through them appears to keep up with the finger, and the
    /// app discards and redraws them next frame when the real samples arrive.
    /// Never persist them — committing a predicted point to a document means
    /// committing a guess.
    pub predicted_points: TouchPointVec,
}

/// What is making a touch contact.
///
/// Mirrors Android's `MotionEvent.TOOL_TYPE_*`, which is the richest of the
/// platform vocabularies; Windows and Wayland report a subset. `Palm` matters
/// even though nothing can be done with it directly: a digitizer that can
/// classify a palm is telling the app to IGNORE that contact, which is the
/// whole of palm rejection.
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub enum TouchToolType {
    /// The platform did not say.
    Unknown,
    /// A fingertip.
    Finger,
    /// A stylus tip.
    Stylus,
    /// The inverted end of a stylus.
    Eraser,
    /// A resting palm — the digitizer classified this contact as accidental.
    Palm,
    /// A mouse, reported through the touch stream (Android `SOURCE_MOUSE`
    /// contacts, some digitizer pucks).
    Mouse,
}

/// Single touch point (finger, stylus, etc.)
#[derive(Debug, Copy, Clone, PartialEq, PartialOrd)]
#[repr(C)]
pub struct TouchPoint {
    /// Unique identifier for this touch point (persists across move events)
    pub id: u64,
    /// Which SEAT's touchscreen this contact is on (9b-ii-a-i-c): a second
    /// seat's fingers have their own id space (Wayland `wl_touch` ids are per
    /// seat, X11 touch events carry their master pointer), so a contact is
    /// identified by (`seat_id`, `id`). `PRIMARY_POINTER_SEAT` for the one
    /// touchscreen every other platform has.
    pub seat_id: u64,
    /// Current position of the touch point in logical coordinates
    pub position: LogicalPosition,
    /// Force/pressure of the touch (0.0 = no pressure, 1.0 = maximum pressure)
    /// Set to 0.5 if pressure is not available
    pub force: f32,
    /// Major axis of the contact ellipse, in logical px. `0.0` = not reported.
    ///
    /// A contact is an area, not a point, and every platform says so: Wayland
    /// `wl_touch.shape`, Windows `POINTER_TOUCH_INFO.rcContact`, Android
    /// `AXIS_TOUCH_MAJOR`. Without it there is no palm rejection, no
    /// brush-size-from-fingertip, and no way to size a hit target to a thumb
    /// rather than to a mouse cursor.
    pub major: f32,
    /// Minor axis of the contact ellipse, in logical px. `0.0` = not reported.
    pub minor: f32,
    /// Rotation of the contact ellipse, radians clockwise from the x-axis.
    /// `0.0` when unreported OR when a circular contact makes it meaningless —
    /// check `major`/`minor` before trusting it.
    pub orientation_rad: f32,
    /// What is touching. `Unknown` where the platform does not classify.
    pub tool_type: TouchToolType,
}

/// The one `u64` a touch contact is tracked under in the hover manager and
/// the gesture sessions (9b-ii-a-i-c): the raw id for the primary seat, so
/// every existing key stays what it was, and a seat-namespaced value for
/// any other seat, so two seats' finger `0` never share a session.
#[must_use]
pub const fn touch_point_key(seat_id: u64, id: u64) -> u64 {
    if seat_id == PRIMARY_POINTER_SEAT {
        id
    } else {
        0x8000_0000_0000_0000 | (seat_id.rotate_left(32) ^ id)
    }
}

impl_option!(
    TouchPoint,
    OptionTouchPoint,
    [Debug, Copy, Clone, PartialEq, PartialOrd]
);

impl_vec!(
    TouchPoint,
    TouchPointVec,
    TouchPointVecDestructor,
    TouchPointVecDestructorType,
    TouchPointVecSlice,
    OptionTouchPoint
);
impl_vec_debug!(TouchPoint, TouchPointVec);
impl_vec_clone!(TouchPoint, TouchPointVec, TouchPointVecDestructor);
impl_vec_partialeq!(TouchPoint, TouchPointVec);

/// State, size, etc of the window, for comparing to the last frame
#[derive(Debug, Copy, Clone, PartialEq, PartialOrd, Hash, Ord, Eq)]
#[repr(C)]
#[derive(Default)]
pub enum WindowTheme {
    DarkMode,
    #[default]
    LightMode,
}

impl_option!(
    WindowTheme,
    OptionWindowTheme,
    [Debug, Copy, Clone, PartialEq, PartialOrd, Ord, Eq, Hash]
);

/// Identifies a specific monitor/display
///
/// Contains both an index (for fast current-session lookup) and a stable hash
/// (for persistence across app restarts and monitor reconfigurations).
///
/// - `index`: Runtime index (0-based), may change if monitors are added/removed
/// - `hash`: Stable identifier based on monitor properties (name, size, position)
///
/// Applications can serialize `hash` to remember which monitor a window was on,
/// then search for matching hash on next launch, falling back to index or PRIMARY.
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, Ord, PartialOrd)]
#[repr(C)]
pub struct MonitorId {
    /// Runtime index of the monitor (may change between sessions)
    pub index: usize,
    /// Stable hash of monitor properties (for persistence)
    pub hash: u64,
}

impl MonitorId {
    /// Primary/default monitor (index 0, hash 0)
    pub const PRIMARY: Self = Self { index: 0, hash: 0 };

    /// Create a `MonitorId` from index only (hash will be 0)
    #[must_use]
    pub const fn new(index: usize) -> Self {
        Self { index, hash: 0 }
    }

    /// Create a `MonitorId` from index and hash
    #[must_use]
    pub const fn from_index_and_hash(index: usize, hash: u64) -> Self {
        Self { index, hash }
    }

    /// Create a stable monitor ID from monitor properties
    ///
    /// Uses FNV-1a hash of: name + position + size
    /// This ensures the hash is stable across app restarts as long as
    /// the monitor configuration doesn't change significantly
    #[must_use]
    pub fn from_properties(
        index: usize,
        name: &str,
        position: LayoutPoint,
        size: LayoutSize,
    ) -> Self {
        use core::hash::{Hash, Hasher};

        // FNV-1a hash (simple, fast, good distribution)
        struct FnvHasher(u64);

        impl Hasher for FnvHasher {
            fn write(&mut self, bytes: &[u8]) {
                const FNV_PRIME: u64 = 0x0100_0000_01b3;
                for &byte in bytes {
                    self.0 ^= u64::from(byte);
                    self.0 = self.0.wrapping_mul(FNV_PRIME);
                }
            }

            fn finish(&self) -> u64 {
                self.0
            }
        }

        const FNV_OFFSET_BASIS: u64 = 0xcbf2_9ce4_8422_2325;
        let mut hasher = FnvHasher(FNV_OFFSET_BASIS);

        // Hash the monitor properties
        name.hash(&mut hasher);
        (position.x as i64).hash(&mut hasher);
        (position.y as i64).hash(&mut hasher);
        (size.width as i64).hash(&mut hasher);
        (size.height as i64).hash(&mut hasher);

        Self {
            index,
            hash: hasher.finish(),
        }
    }
}

impl_option!(
    MonitorId,
    OptionMonitorId,
    [Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash]
);

/// Complete information about a monitor/display
#[derive(Debug, PartialEq, PartialOrd, Clone)]
#[repr(C)]
pub struct Monitor {
    /// Unique identifier for this monitor (stable across frames)
    pub monitor_id: MonitorId,
    /// Human-readable name (e.g., "\\.\DISPLAY1", "HDMI-1", "Built-in Retina Display")
    pub monitor_name: OptionString,
    /// Physical size of the monitor in logical pixels
    pub size: LayoutSize,
    /// Position of the monitor in the virtual screen coordinate system
    pub position: LayoutPoint,
    /// DPI scale factor (1.0 = 96 DPI, 2.0 = 192 DPI for Retina)
    pub scale_factor: f64,
    /// Work area (monitor bounds minus taskbars/panels) in logical pixels
    pub work_area: LayoutRect,
    /// Available video modes for this monitor
    pub video_modes: VideoModeVec,
    /// Whether this is the primary/main monitor
    pub is_primary_monitor: bool,
}

impl_option!(
    Monitor,
    OptionMonitor,
    copy = false,
    [Debug, PartialEq, PartialOrd, Clone]
);

impl_vec!(
    Monitor,
    MonitorVec,
    MonitorVecDestructor,
    MonitorVecDestructorType,
    MonitorVecSlice,
    OptionMonitor
);
impl_vec_debug!(Monitor, MonitorVec);
impl_vec_clone!(Monitor, MonitorVec, MonitorVecDestructor);
impl_vec_partialeq!(Monitor, MonitorVec);
impl_vec_partialord!(Monitor, MonitorVec);

impl Hash for Monitor {
    fn hash<H>(&self, state: &mut H)
    where
        H: Hasher,
    {
        self.monitor_id.hash(state);
    }
}

impl Default for Monitor {
    fn default() -> Self {
        Self {
            monitor_id: MonitorId::PRIMARY,
            monitor_name: OptionString::None,
            size: LayoutSize::zero(),
            position: LayoutPoint::zero(),
            scale_factor: 1.0,
            work_area: LayoutRect::zero(),
            video_modes: Vec::new().into(),
            is_primary_monitor: false,
        }
    }
}
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub struct VideoMode {
    pub size: LayoutSize,
    pub bit_depth: u16,
    pub refresh_rate: u16,
}

impl_option!(
    VideoMode,
    OptionVideoMode,
    [Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash]
);

impl_vec!(
    VideoMode,
    VideoModeVec,
    VideoModeVecDestructor,
    VideoModeVecDestructorType,
    VideoModeVecSlice,
    OptionVideoMode
);
impl_vec_clone!(VideoMode, VideoModeVec, VideoModeVecDestructor);
impl_vec_debug!(VideoMode, VideoModeVec);
impl_vec_partialeq!(VideoMode, VideoModeVec);
impl_vec_partialord!(VideoMode, VideoModeVec);

/// Position of the window on screen
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
#[repr(C, u8)]
#[derive(Default)]
pub enum WindowPosition {
    #[default]
    Uninitialized,
    /// Absolute position on the virtual screen (physical px). The default for
    /// top-level windows.
    Initialized(PhysicalPositionI32),
    /// Offset (physical px) from the PARENT window's top-left corner. Used by
    /// child windows (menus, dropdowns, popups) together with
    /// `WindowCreateOptions.parent_window_id`: the backend resolves the final
    /// screen position as `parent_top_left + offset`. This is robust where
    /// absolute screen coordinates aren't available — notably Wayland, whose
    /// `xdg_popup` / subsurface protocol positions relative to the parent. Falls
    /// back to absolute (`offset` from origin) if there is no parent.
    RelativeToParentWindow(PhysicalPositionI32),
}
#[allow(variant_size_differences)]
// repr(C,u8) FFI enum: boxing the large variant would change the C ABI (api.json bindings); size disparity accepted
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
#[repr(C, u8)]
/// IME composition window rectangle (cursor position + height)
#[derive(Default)]
pub enum ImePosition {
    #[default]
    Uninitialized,
    Initialized(LogicalRect),
}

#[derive(Debug, Copy, Clone, PartialEq, Eq, Ord, PartialOrd, Hash)]
#[repr(C)]
pub struct WindowFlags {
    /// Is the window currently maximized, minimized or fullscreen
    pub frame: WindowFrame,
    /// Window decoration style (title bar, native controls)
    pub decorations: WindowDecorations,
    /// Compositor blur/transparency effect material
    pub background_material: WindowBackgroundMaterial,
    /// Window type classification (Normal, Menu, Tooltip, Dialog)
    pub window_type: WindowType,
    /// User clicked the close button (set by `WindowDelegate`, checked by event loop)
    /// The `close_callback` can set this to false to prevent closing
    pub close_requested: bool,
    /// Is the window currently visible?
    pub is_visible: bool,
    /// Is the window always on top?
    pub is_always_on_top: bool,
    /// Whether the window is resizable
    pub is_resizable: bool,
    /// Whether the window has focus or not (mutating this will request user attention)
    pub has_focus: bool,
    /// Is smooth scrolling enabled for this window?
    pub smooth_scroll_enabled: bool,
    /// Is automatic TAB switching supported?
    pub autotab_enabled: bool,
    /// Enable client-side decorations (custom titlebar with CSD)
    /// Only effective when decorations == `WindowDecorations::None`
    pub has_decorations: bool,
    /// Use native menus (Win32 HMENU, macOS `NSMenu`) instead of Azul window-based menus
    /// Default: true on Windows/macOS, false on Linux
    pub use_native_menus: bool,
    /// Use native context menus instead of Azul window-based context menus
    /// Default: true on Windows/macOS, false on Linux
    pub use_native_context_menus: bool,
    /// Keep window above all others (even from other applications)
    /// Platform-specific: Uses `SetWindowPos(HWND_TOPMOST)` on Windows, [`NSWindow` setLevel:] on
    /// macOS, _`NET_WM_STATE_ABOVE` on X11, `zwlr_layer_shell` on Wayland
    pub is_top_level: bool,
    /// Prevent system from sleeping while window is open
    /// Platform-specific: Uses `SetThreadExecutionState` on Windows, `IOPMAssertionCreateWithName` on
    /// macOS, org.freedesktop.ScreenSaver.Inhibit on Linux
    pub prevent_system_sleep: bool,
    /// Desired fullscreen-transition style.
    ///
    /// On macOS this controls whether entering/leaving fullscreen plays the
    /// system animation (`Slow*`) or transitions immediately (`Fast*`). On
    /// other platforms `Slow*` and `Fast*` behave identically.
    ///
    /// The actual current frame state still lives in [`WindowFlags::frame`]; this
    /// field only describes how the next transition should be performed.
    pub fullscreen_mode: FullScreenMode,
    /// Draw UNDER the notch, the home indicator and the status bar (10c-v).
    ///
    /// `false` (the default, and the browser's `viewport-fit=auto`): the
    /// engine insets the root layout by the platform's safe-area insets, so
    /// nothing lands under a bar and the window's clear colour shows there.
    /// `true` (`viewport-fit=cover`): the root fills the whole surface and the
    /// app places its own content with `get_safe_area_insets()` - what a
    /// full-screen video, a map or a photo viewer wants. The on-screen
    /// keyboard is never part of this: it is a transient occlusion the app
    /// reads from `get_safe_area_insets().keyboard`.
    pub extend_into_safe_area: bool,
}

impl_option!(
    WindowFlags,
    OptionWindowFlags,
    copy = false,
    [Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash]
);

/// Window type classification for behavior control
#[derive(Debug, Copy, Clone, PartialEq, Eq, Ord, PartialOrd, Hash)]
#[repr(C)]
pub enum WindowType {
    /// Normal application window
    Normal,
    /// Menu popup window (always-on-top, frameless, auto-closes on focus loss)
    Menu,
    /// Tooltip window (always-on-top, no interaction)
    Tooltip,
    /// Dialog window (blocks parent window)
    Dialog,
}

impl Default for WindowType {
    fn default() -> Self {
        Self::Normal
    }
}

/// Window frame state (normal, minimized, maximized, fullscreen)
#[derive(Debug, Copy, Clone, PartialEq, Eq, Ord, PartialOrd, Hash)]
#[repr(C)]
pub enum WindowFrame {
    Normal,
    Minimized,
    Maximized,
    Fullscreen,
}

/// Window decoration style
#[derive(Debug, Copy, Clone, PartialEq, Eq, Ord, PartialOrd, Hash)]
#[repr(C)]
pub enum WindowDecorations {
    /// Full decorations: title bar with controls
    Normal,
    /// No title text but controls visible (extended frame).
    /// The application must draw its own title text.
    NoTitle,
    /// Like `NoTitle`, but the framework auto-injects a `Titlebar`
    /// at the top of the user's DOM after calling the layout callback.
    ///
    /// The injected titlebar reads `TitlebarMetrics` from `SystemStyle` for
    /// correct padding around the OS-drawn window control buttons, uses the
    /// system title font, and carries the `__azul-native-titlebar` class for
    /// automatic window-drag activation.
    NoTitleAutoInject,
    /// No controls visible but title bar area present
    NoControls,
    /// No decorations at all (borderless)
    None,
}

impl Default for WindowDecorations {
    fn default() -> Self {
        Self::Normal
    }
}

/// Compositor blur/transparency effects for window background.
///
/// Anything but `Opaque` gives the window PER-PIXEL alpha on the CPU path:
/// the frame is cleared to transparent and whatever the content leaves at
/// alpha 0 shows the desktop through (a `border-radius` on the body makes
/// real rounded corners; a clip mask on the body makes any shape). The
/// window's INPUT shape follows that alpha as well - clicks on fully
/// transparent pixels fall through to whatever is behind, on every backend
/// (macOS does this by itself for a non-opaque window; X11 gets an `XShape`,
/// Wayland an input region, Windows a window region). This is partial
/// (per-pixel) transparency, not whole-window opacity; X11 without an ARGB
/// visual falls back to `_NET_WM_WINDOW_OPACITY`, which is whole-window.
#[derive(Debug, Copy, Clone, PartialEq, Eq, Ord, PartialOrd, Hash)]
#[repr(C)]
pub enum WindowBackgroundMaterial {
    /// No transparency or blur
    Opaque,
    /// Transparent without blur
    Transparent,
    /// macOS: Sidebar material, Windows: Acrylic light
    Sidebar,
    /// macOS: Menu material, Windows: Acrylic
    Menu,
    /// macOS: HUD material, Windows: Acrylic dark
    HUD,
    /// macOS: Titlebar material, Windows: Mica
    Titlebar,
    /// Windows: Mica Alt material
    MicaAlt,
}

impl Default for WindowBackgroundMaterial {
    fn default() -> Self {
        Self::Opaque
    }
}

impl Default for WindowFlags {
    fn default() -> Self {
        Self {
            frame: WindowFrame::Normal,
            decorations: WindowDecorations::Normal,
            background_material: WindowBackgroundMaterial::Opaque,
            window_type: WindowType::Normal,
            close_requested: false,
            is_visible: true,
            is_always_on_top: false,
            is_resizable: true,
            has_focus: true,
            smooth_scroll_enabled: true,
            autotab_enabled: true,
            has_decorations: false,
            // Native menus are the default on platforms that support them (Windows/macOS)
            // The platform layer will override this appropriately
            use_native_menus: cfg!(any(target_os = "windows", target_os = "macos")),
            use_native_context_menus: cfg!(any(target_os = "windows", target_os = "macos")),
            is_top_level: false,
            prevent_system_sleep: false,
            fullscreen_mode: FullScreenMode::FastFullScreen,
            extend_into_safe_area: false,
        }
    }
}

impl WindowFlags {
    /// Check if window is a menu popup
    #[inline]
    #[must_use]
    pub fn is_menu_window(&self) -> bool {
        self.window_type == WindowType::Menu
    }

    /// Check if window is a tooltip
    #[inline]
    #[must_use]
    pub fn is_tooltip_window(&self) -> bool {
        self.window_type == WindowType::Tooltip
    }

    /// Check if window is a dialog
    #[inline]
    #[must_use]
    pub fn is_dialog_window(&self) -> bool {
        self.window_type == WindowType::Dialog
    }

    /// Check if window currently has focus
    #[inline]
    #[must_use]
    pub const fn window_has_focus(&self) -> bool {
        self.has_focus
    }

    /// Check if close was requested via callback
    #[inline]
    #[must_use]
    pub const fn is_close_requested(&self) -> bool {
        self.close_requested
    }

    /// Check if window has client-side decorations enabled
    #[inline]
    #[must_use]
    pub const fn has_csd(&self) -> bool {
        self.has_decorations
    }

    /// Check if native menus should be used
    #[inline]
    #[must_use]
    pub const fn use_native_menus(&self) -> bool {
        self.use_native_menus
    }

    /// Check if native context menus should be used
    #[inline]
    #[must_use]
    pub const fn use_native_context_menus(&self) -> bool {
        self.use_native_context_menus
    }
}

/// Platform-specific window configuration options (Windows, Linux, macOS, WASM)
#[derive(Debug, Default, Clone, PartialEq, PartialOrd)]
#[repr(C)]
pub struct PlatformSpecificOptions {
    pub windows_options: WindowsWindowOptions,
    pub linux_options: LinuxWindowOptions,
    pub mac_options: MacWindowOptions,
    pub wasm_options: WasmWindowOptions,
}

// SAFETY: PlatformSpecificOptions contains raw pointers (X11Visual) that are
// opaque platform handles, not dereferenced across threads.
unsafe impl Sync for PlatformSpecificOptions {}
#[allow(clippy::non_send_fields_in_send_ty)] // opaque platform handles, not dereferenced across threads (see note above)
unsafe impl Send for PlatformSpecificOptions {}

#[derive(Debug, Clone, PartialEq, Eq, PartialOrd)]
#[repr(C)]
pub struct WindowsWindowOptions {
    /// STARTUP ONLY: Whether the window should allow drag + drop operations (default: true)
    pub allow_drag_and_drop: bool,
    /// STARTUP ONLY: Sets `WS_EX_NOREDIRECTIONBITMAP`
    pub no_redirection_bitmap: bool,
    /// STARTUP ONLY: Window icon (decoded bytes), appears at the top right corner of the window
    pub window_icon: OptionWindowIcon,
    /// READWRITE: Taskbar icon (decoded bytes), usually 256x256x4 bytes large (`ICON_BIG`).
    ///
    /// Can be changed in callbacks / at runtime.
    pub taskbar_icon: OptionTaskBarIcon,
    // NOTE: the old Windows-specific `parent_window: OptionHwndHandle` field was
    // removed in favor of the cross-platform `WindowCreateOptions.parent_window_id`
    // (+ `WindowPosition::RelativeToParentWindow`), which every backend resolves
    // through its window registry. One parenting model for all platforms.
}

impl Default for WindowsWindowOptions {
    fn default() -> Self {
        Self {
            allow_drag_and_drop: true,
            no_redirection_bitmap: false,
            window_icon: OptionWindowIcon::None,
            taskbar_icon: OptionTaskBarIcon::None,
        }
    }
}

/// X window type. Maps directly to
/// [`_NET_WM_WINDOW_TYPE`](https://specifications.freedesktop.org/wm-spec/wm-spec-1.5.html).
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
#[derive(Default)]
pub enum XWindowType {
    /// A desktop feature. This can include a single window containing desktop icons with the same
    /// dimensions as the screen, allowing the desktop environment to have full control of the
    /// desktop, without the need for proxying root window clicks.
    Desktop,
    /// A dock or panel feature. Typically a Window Manager would keep such windows on top of all
    /// other windows.
    Dock,
    /// Toolbar windows. "Torn off" from the main application.
    Toolbar,
    /// Pinnable menu windows. "Torn off" from the main application.
    Menu,
    /// A small persistent utility window, such as a palette or toolbox.
    Utility,
    /// The window is a splash screen displayed as an application is starting up.
    Splash,
    /// This is a dialog window.
    Dialog,
    /// A dropdown menu that usually appears when the user clicks on an item in a menu bar.
    /// This property is typically used on override-redirect windows.
    DropdownMenu,
    /// A popup menu that usually appears when the user right clicks on an object.
    /// This property is typically used on override-redirect windows.
    PopupMenu,
    /// A tooltip window. Usually used to show additional information when hovering over an object
    /// with the cursor. This property is typically used on override-redirect windows.
    Tooltip,
    /// The window is a notification.
    /// This property is typically used on override-redirect windows.
    Notification,
    /// This should be used on the windows that are popped up by combo boxes.
    /// This property is typically used on override-redirect windows.
    Combo,
    /// This indicates the the window is being dragged.
    /// This property is typically used on override-redirect windows.
    Dnd,
    /// This is a normal, top-level window.
    #[default]
    Normal,
}

impl_option!(
    XWindowType,
    OptionXWindowType,
    [Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash]
);

#[derive(Debug, Copy, Clone, PartialEq, PartialOrd, Ord, Eq, Hash)]
#[repr(C)]
#[derive(Default)]
pub enum UserAttentionType {
    #[default]
    None,
    Critical,
    Informational,
}

/// State for tracking hover and interaction with Linux window decoration elements (CSD).
#[derive(Debug, Default, Copy, Clone, PartialEq, PartialOrd, Ord, Eq, Hash)]
#[repr(C)]
pub struct LinuxDecorationsState {
    pub is_dragging_titlebar: bool,
    pub close_button_hover: bool,
    pub maximize_button_hover: bool,
    pub minimize_button_hover: bool,
}

impl_option!(
    LinuxDecorationsState,
    OptionLinuxDecorationsState,
    [Debug, Copy, Clone, PartialEq, PartialOrd, Ord, Eq, Hash]
);

#[derive(Debug, Default, Clone, PartialEq, PartialOrd)]
#[repr(C)]
pub struct LinuxWindowOptions {
    pub wayland_theme: OptionWaylandTheme,
    pub window_icon: OptionWindowIcon,
    /// Build window with `_GTK_THEME_VARIANT` hint set to the specified value. Currently only
    /// relevant on X11. Can only be set at window creation, can't be changed in callbacks.
    pub x11_gtk_theme_variant: OptionString,
    /// Build window with a given application ID. It should match the `.desktop` file distributed
    /// with your program. Only relevant on Wayland.
    /// Can only be set at window creation, can't be changed in callbacks.
    ///
    /// For details about application ID conventions, see the
    /// [Desktop Entry Spec](https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html#desktop-file-id)
    pub wayland_app_id: OptionString,
    /// Build window with `WM_CLASS` hint; defaults to the name of the binary. Only relevant on
    /// X11. Can only be set at window creation, can't be changed in callbacks.
    pub x11_wm_classes: StringPairVec,
    /// Build window with `_NET_WM_WINDOW_TYPE` hint; defaults to `Normal`. Only relevant on X11.
    /// Can only be set at window creation, can't be changed in callbacks.
    pub x11_window_types: XWindowTypeVec,
    /// (Unimplemented) - Can only be set at window creation, can't be changed in callbacks.
    pub x11_visual: OptionX11Visual,
    /// Build window with resize increment hint. Only implemented on X11.
    /// Can only be set at window creation, can't be changed in callbacks.
    pub x11_resize_increments: OptionLogicalSize,
    /// Build window with base size hint. Only implemented on X11.
    /// Can only be set at window creation, can't be changed in callbacks.
    pub x11_base_size: OptionLogicalSize,
    /// (Unimplemented) - Can only be set at window creation, can't be changed in callbacks.
    pub x11_screen: OptionI32,
    pub request_user_attention: UserAttentionType,
    /// X11-specific: Client-side decoration state (drag position, button hover, etc.)
    pub x11_decorations_state: OptionLinuxDecorationsState,
    /// Build window with override-redirect flag; defaults to false. Only relevant on X11.
    /// Can only be set at window creation, can't be changed in callbacks.
    pub x11_override_redirect: bool,
}

pub type X11Visual = *const c_void;
impl_option!(
    X11Visual,
    OptionX11Visual,
    [Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash]
);

/// A key-value pair of strings, used for X11 `WM_CLASS` and other platform properties
#[derive(Debug, Default, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
#[repr(C)]
pub struct AzStringPair {
    pub key: AzString,
    pub value: AzString,
}

impl_option!(
    AzStringPair,
    OptionStringPair,
    copy = false,
    [Debug, Clone, PartialEq, PartialOrd, Eq, Ord, Hash]
);

impl_vec!(
    AzStringPair,
    StringPairVec,
    StringPairVecDestructor,
    StringPairVecDestructorType,
    StringPairVecSlice,
    OptionStringPair
);
impl_vec_mut!(AzStringPair, StringPairVec);
impl_vec_debug!(AzStringPair, StringPairVec);
impl_vec_partialord!(AzStringPair, StringPairVec);
impl_vec_ord!(AzStringPair, StringPairVec);
impl_vec_clone!(AzStringPair, StringPairVec, StringPairVecDestructor);
impl_vec_partialeq!(AzStringPair, StringPairVec);
impl_vec_eq!(AzStringPair, StringPairVec);
impl_vec_hash!(AzStringPair, StringPairVec);

impl_option!(
    StringPairVec,
    OptionStringPairVec,
    copy = false,
    [Debug, Clone, PartialOrd, PartialEq, Ord, Eq, Hash]
);

impl StringPairVec {
    #[must_use]
    pub fn get_key(&self, search_key: &str) -> Option<&AzString> {
        self.as_ref().iter().find_map(|v| {
            if v.key.as_str() == search_key {
                Some(&v.value)
            } else {
                None
            }
        })
    }
    pub fn get_key_mut(&mut self, search_key: &str) -> Option<&mut AzStringPair> {
        self.as_mut()
            .iter_mut()
            .find(|v| v.key.as_str() == search_key)
    }
    pub fn insert_kv<I: Into<AzString>>(&mut self, key: I, value: I) {
        let key = key.into();
        let value = value.into();
        match self.get_key_mut(key.as_str()) {
            None => {}
            Some(s) => {
                s.value = value;
                return;
            }
        }
        self.push(AzStringPair { key, value });
    }
}

impl_vec!(
    XWindowType,
    XWindowTypeVec,
    XWindowTypeVecDestructor,
    XWindowTypeVecDestructorType,
    XWindowTypeVecSlice,
    OptionXWindowType
);
impl_vec_debug!(XWindowType, XWindowTypeVec);
impl_vec_partialord!(XWindowType, XWindowTypeVec);
impl_vec_ord!(XWindowType, XWindowTypeVec);
impl_vec_clone!(XWindowType, XWindowTypeVec, XWindowTypeVecDestructor);
impl_vec_partialeq!(XWindowType, XWindowTypeVec);
impl_vec_eq!(XWindowType, XWindowTypeVec);
impl_vec_hash!(XWindowType, XWindowTypeVec);

impl_option!(
    WaylandTheme,
    OptionWaylandTheme,
    copy = false,
    [Debug, Clone, PartialEq, PartialOrd]
);

/// macOS-specific window options (reserved for future use)
#[derive(Debug, Default, Copy, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
#[repr(C)]
// `_`-prefixed fields are C-ABI/api.json names; cannot rename.
#[allow(clippy::pub_underscore_fields)]
pub struct MacWindowOptions {
    // empty for now, single field must be present for ABI compat - always set to 0
    pub _reserved: u8,
}

/// WASM/web-specific window options (reserved for future use)
#[derive(Debug, Default, Copy, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
#[repr(C)]
// `_`-prefixed fields are C-ABI/api.json names; cannot rename.
#[allow(clippy::pub_underscore_fields)]
pub struct WasmWindowOptions {
    // empty for now, single field must be present for ABI compat - always set to 0
    pub _reserved: u8,
}

#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
#[derive(Default)]
pub enum FullScreenMode {
    /// - macOS: If the window is in windowed mode, transitions it slowly to fullscreen mode
    /// - other: Does the same as `FastFullScreen`.
    SlowFullScreen,
    /// Window should immediately go into fullscreen mode (on macOS this is not the default
    /// behaviour).
    #[default]
    FastFullScreen,
    /// - macOS: If the window is in fullscreen mode, transitions slowly back to windowed state.
    /// - other: Does the same as `FastWindowed`.
    SlowWindowed,
    /// If the window is in fullscreen mode, will immediately go back to windowed mode (on macOS
    /// this is not the default behaviour).
    FastWindowed,
}

// Translation type because in winit 24.0 the WinitWaylandTheme is a trait instead
// of a struct, which makes things more complicated
#[derive(Debug, Clone, PartialEq, PartialOrd)]
#[repr(C)]
pub struct WaylandTheme {
    pub title_bar_active_background_color: ColorU,
    pub title_bar_active_separator_color: ColorU,
    pub title_bar_active_text_color: ColorU,
    pub title_bar_inactive_background_color: ColorU,
    pub title_bar_inactive_separator_color: ColorU,
    pub title_bar_inactive_text_color: ColorU,
    pub maximize_idle_foreground_inactive_color: ColorU,
    pub minimize_idle_foreground_inactive_color: ColorU,
    pub close_idle_foreground_inactive_color: ColorU,
    pub maximize_hovered_foreground_inactive_color: ColorU,
    pub minimize_hovered_foreground_inactive_color: ColorU,
    pub close_hovered_foreground_inactive_color: ColorU,
    pub maximize_disabled_foreground_inactive_color: ColorU,
    pub minimize_disabled_foreground_inactive_color: ColorU,
    pub close_disabled_foreground_inactive_color: ColorU,
    pub maximize_idle_background_inactive_color: ColorU,
    pub minimize_idle_background_inactive_color: ColorU,
    pub close_idle_background_inactive_color: ColorU,
    pub maximize_hovered_background_inactive_color: ColorU,
    pub minimize_hovered_background_inactive_color: ColorU,
    pub close_hovered_background_inactive_color: ColorU,
    pub maximize_disabled_background_inactive_color: ColorU,
    pub minimize_disabled_background_inactive_color: ColorU,
    pub close_disabled_background_inactive_color: ColorU,
    pub maximize_idle_foreground_active_color: ColorU,
    pub minimize_idle_foreground_active_color: ColorU,
    pub close_idle_foreground_active_color: ColorU,
    pub maximize_hovered_foreground_active_color: ColorU,
    pub minimize_hovered_foreground_active_color: ColorU,
    pub close_hovered_foreground_active_color: ColorU,
    pub maximize_disabled_foreground_active_color: ColorU,
    pub minimize_disabled_foreground_active_color: ColorU,
    pub close_disabled_foreground_active_color: ColorU,
    pub maximize_idle_background_active_color: ColorU,
    pub minimize_idle_background_active_color: ColorU,
    pub close_idle_background_active_color: ColorU,
    pub maximize_hovered_background_active_color: ColorU,
    pub minimize_hovered_background_active_color: ColorU,
    pub close_hovered_background_active_color: ColorU,
    pub maximize_disabled_background_active_color: ColorU,
    pub minimize_disabled_background_active_color: ColorU,
    pub close_disabled_background_active_color: ColorU,
    pub title_bar_font: AzString,
    pub title_bar_font_size: f32,
}

/// The global CSS viewport breakpoints for `@media`-style conditions.
///
/// The dynamic-selector system evaluates against these, and they are one of
/// the three signals the resize fast path checks: crossing any of these
/// (on either axis) re-invokes the
/// app's `layout()`; staying between them re-flows the existing DOM.
///
/// Lived in `azul-dll`'s shell (`shell2::common::CSS_BREAKPOINTS`, still
/// re-exported there) until the headless E2E runner needed the same resize
/// decision — the list is engine policy, not shell policy.
pub const CSS_BREAKPOINTS: &[f32] = &[320.0, 480.0, 640.0, 768.0, 1024.0, 1280.0, 1440.0, 1920.0];

#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd)]
#[repr(C)]
pub struct WindowSize {
    /// Width and height of the window, in logical
    /// units (may not correspond to the physical on-screen size)
    pub dimensions: LogicalSize,
    /// Actual DPI value (default: 96)
    pub dpi: u32,
    /// Minimum dimensions of the window
    pub min_dimensions: OptionLogicalSize,
    /// Maximum dimensions of the window
    pub max_dimensions: OptionLogicalSize,
}

impl WindowSize {
    #[allow(clippy::cast_possible_truncation)] // bounded DPI/dimension/number conversion
    #[must_use]
    pub fn get_layout_size(&self) -> LayoutSize {
        LayoutSize::new(
            libm::roundf(self.dimensions.width) as isize,
            libm::roundf(self.dimensions.height) as isize,
        )
    }

    /// Get the actual logical size
    #[must_use]
    pub const fn get_logical_size(&self) -> LogicalSize {
        self.dimensions
    }

    #[must_use]
    pub fn get_physical_size(&self) -> PhysicalSize<u32> {
        self.dimensions
            .to_physical(self.get_hidpi_factor().inner.get())
    }

    #[allow(clippy::cast_precision_loss)] // bounded DPI/dimension/number conversion
    #[must_use]
    pub fn get_hidpi_factor(&self) -> DpiScaleFactor {
        // Guard against `dpi == 0` (uninitialized / misreporting platform),
        // which would yield a 0.0 scale factor and later divide-by-zero when
        // converting physical <-> logical sizes (`to_logical` divides by this).
        // Fall back to the standard 96 DPI (scale 1.0).
        let dpi = if self.dpi == 0 { 96 } else { self.dpi };
        DpiScaleFactor {
            inner: FloatValue::new(dpi as f32 / 96.0),
        }
    }
}

impl Default for WindowSize {
    fn default() -> Self {
        Self {
            dimensions: LogicalSize::new(640.0, 480.0),
            dpi: 96,
            min_dimensions: None.into(),
            max_dimensions: None.into(),
        }
    }
}

#[repr(C)]
#[derive(Debug, Copy, Clone, PartialEq, PartialOrd, Ord, Eq, Hash)]
pub enum RendererType {
    /// Force hardware rendering
    Hardware,
    /// Force software rendering
    Software,
}

impl_option!(
    RendererType,
    OptionRendererType,
    [Debug, Copy, Clone, PartialEq, PartialOrd, Ord, Eq, Hash]
);

#[derive(Debug, Clone, PartialEq, PartialOrd, Ord, Eq, Hash)]
pub enum UpdateFocusWarning {
    FocusInvalidDomId(DomId),
    FocusInvalidNodeId(NodeHierarchyItemId),
    CouldNotFindFocusNode(CssPath),
}

impl ::core::fmt::Display for UpdateFocusWarning {
    fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
        use self::UpdateFocusWarning::{
            CouldNotFindFocusNode, FocusInvalidDomId, FocusInvalidNodeId,
        };
        match self {
            FocusInvalidDomId(dom_id) => write!(f, "Focusing on DOM with invalid ID: {dom_id:?}"),
            FocusInvalidNodeId(node_id) => {
                write!(f, "Focusing on node with invalid ID: {node_id}")
            }
            CouldNotFindFocusNode(css_path) => {
                write!(f, "Could not find focus node for path: {css_path}")
            }
        }
    }
}

/// Utility function for easier creation of a keymap - i.e. `[vec![Ctrl, S], my_function]`
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C, u8)]
pub enum AcceleratorKey {
    Ctrl,
    Alt,
    Shift,
    Key(VirtualKeyCode),
}

impl AcceleratorKey {
    /// Checks if the current keyboard state contains the given char or modifier,
    /// i.e. if the keyboard state currently has the shift key pressed and the
    /// accelerator key is `Shift`, evaluates to true, otherwise to false.
    #[must_use]
    pub fn matches(&self, keyboard_state: &KeyboardState) -> bool {
        use self::AcceleratorKey::{Alt, Ctrl, Key, Shift};
        match self {
            Ctrl => keyboard_state.ctrl_down(),
            Alt => keyboard_state.alt_down(),
            Shift => keyboard_state.shift_down(),
            Key(k) => keyboard_state.is_key_down(*k),
        }
    }
}

/// Symbolic name for a keyboard key, does NOT take the keyboard locale into account
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub enum VirtualKeyCode {
    Key1,
    Key2,
    Key3,
    Key4,
    Key5,
    Key6,
    Key7,
    Key8,
    Key9,
    Key0,
    A,
    B,
    C,
    D,
    E,
    F,
    G,
    H,
    I,
    J,
    K,
    L,
    M,
    N,
    O,
    P,
    Q,
    R,
    S,
    T,
    U,
    V,
    W,
    X,
    Y,
    Z,
    Escape,
    F1,
    F2,
    F3,
    F4,
    F5,
    F6,
    F7,
    F8,
    F9,
    F10,
    F11,
    F12,
    F13,
    F14,
    F15,
    F16,
    F17,
    F18,
    F19,
    F20,
    F21,
    F22,
    F23,
    F24,
    Snapshot,
    Scroll,
    Pause,
    Insert,
    Home,
    Delete,
    End,
    PageDown,
    PageUp,
    Left,
    Up,
    Right,
    Down,
    Back,
    Return,
    Space,
    Compose,
    Caret,
    Numlock,
    Numpad0,
    Numpad1,
    Numpad2,
    Numpad3,
    Numpad4,
    Numpad5,
    Numpad6,
    Numpad7,
    Numpad8,
    Numpad9,
    NumpadAdd,
    NumpadDivide,
    NumpadDecimal,
    NumpadComma,
    NumpadEnter,
    NumpadEquals,
    NumpadMultiply,
    NumpadSubtract,
    AbntC1,
    AbntC2,
    Apostrophe,
    Apps,
    Asterisk,
    At,
    Ax,
    Backslash,
    Calculator,
    Capital,
    Colon,
    Comma,
    Convert,
    Equals,
    Grave,
    Kana,
    Kanji,
    LAlt,
    LBracket,
    LControl,
    LShift,
    LWin,
    Mail,
    MediaSelect,
    MediaStop,
    Minus,
    Mute,
    MyComputer,
    NavigateForward,
    NavigateBackward,
    NextTrack,
    NoConvert,
    OEM102,
    Period,
    PlayPause,
    Plus,
    Power,
    PrevTrack,
    RAlt,
    RBracket,
    RControl,
    RShift,
    RWin,
    Semicolon,
    Slash,
    Sleep,
    Stop,
    Sysrq,
    Tab,
    Underline,
    Unlabeled,
    VolumeDown,
    VolumeUp,
    Wake,
    WebBack,
    WebFavorites,
    WebForward,
    WebHome,
    WebRefresh,
    WebSearch,
    WebStop,
    Yen,
    Copy,
    Paste,
    Cut,
}

impl VirtualKeyCode {
    /// Reconstructs a `VirtualKeyCode` from its `as u32` discriminant.
    ///
    /// This enum is a fieldless `#[repr(C)]` enum with no explicit discriminants,
    /// so the discriminants are assigned sequentially in declaration order and
    /// `VariantN as u32` round-trips through this table. Used to recover the key
    /// of a keyboard *event* from its `key_code` (which is stored as
    /// `VirtualKeyCode as u32`) instead of reading live keyboard state.
    #[must_use]
    #[allow(clippy::too_many_lines)] // exhaustive keycode match table
    pub const fn from_u32(v: u32) -> Option<Self> {
        match v {
            0 => Some(Self::Key1),
            1 => Some(Self::Key2),
            2 => Some(Self::Key3),
            3 => Some(Self::Key4),
            4 => Some(Self::Key5),
            5 => Some(Self::Key6),
            6 => Some(Self::Key7),
            7 => Some(Self::Key8),
            8 => Some(Self::Key9),
            9 => Some(Self::Key0),
            10 => Some(Self::A),
            11 => Some(Self::B),
            12 => Some(Self::C),
            13 => Some(Self::D),
            14 => Some(Self::E),
            15 => Some(Self::F),
            16 => Some(Self::G),
            17 => Some(Self::H),
            18 => Some(Self::I),
            19 => Some(Self::J),
            20 => Some(Self::K),
            21 => Some(Self::L),
            22 => Some(Self::M),
            23 => Some(Self::N),
            24 => Some(Self::O),
            25 => Some(Self::P),
            26 => Some(Self::Q),
            27 => Some(Self::R),
            28 => Some(Self::S),
            29 => Some(Self::T),
            30 => Some(Self::U),
            31 => Some(Self::V),
            32 => Some(Self::W),
            33 => Some(Self::X),
            34 => Some(Self::Y),
            35 => Some(Self::Z),
            36 => Some(Self::Escape),
            37 => Some(Self::F1),
            38 => Some(Self::F2),
            39 => Some(Self::F3),
            40 => Some(Self::F4),
            41 => Some(Self::F5),
            42 => Some(Self::F6),
            43 => Some(Self::F7),
            44 => Some(Self::F8),
            45 => Some(Self::F9),
            46 => Some(Self::F10),
            47 => Some(Self::F11),
            48 => Some(Self::F12),
            49 => Some(Self::F13),
            50 => Some(Self::F14),
            51 => Some(Self::F15),
            52 => Some(Self::F16),
            53 => Some(Self::F17),
            54 => Some(Self::F18),
            55 => Some(Self::F19),
            56 => Some(Self::F20),
            57 => Some(Self::F21),
            58 => Some(Self::F22),
            59 => Some(Self::F23),
            60 => Some(Self::F24),
            61 => Some(Self::Snapshot),
            62 => Some(Self::Scroll),
            63 => Some(Self::Pause),
            64 => Some(Self::Insert),
            65 => Some(Self::Home),
            66 => Some(Self::Delete),
            67 => Some(Self::End),
            68 => Some(Self::PageDown),
            69 => Some(Self::PageUp),
            70 => Some(Self::Left),
            71 => Some(Self::Up),
            72 => Some(Self::Right),
            73 => Some(Self::Down),
            74 => Some(Self::Back),
            75 => Some(Self::Return),
            76 => Some(Self::Space),
            77 => Some(Self::Compose),
            78 => Some(Self::Caret),
            79 => Some(Self::Numlock),
            80 => Some(Self::Numpad0),
            81 => Some(Self::Numpad1),
            82 => Some(Self::Numpad2),
            83 => Some(Self::Numpad3),
            84 => Some(Self::Numpad4),
            85 => Some(Self::Numpad5),
            86 => Some(Self::Numpad6),
            87 => Some(Self::Numpad7),
            88 => Some(Self::Numpad8),
            89 => Some(Self::Numpad9),
            90 => Some(Self::NumpadAdd),
            91 => Some(Self::NumpadDivide),
            92 => Some(Self::NumpadDecimal),
            93 => Some(Self::NumpadComma),
            94 => Some(Self::NumpadEnter),
            95 => Some(Self::NumpadEquals),
            96 => Some(Self::NumpadMultiply),
            97 => Some(Self::NumpadSubtract),
            98 => Some(Self::AbntC1),
            99 => Some(Self::AbntC2),
            100 => Some(Self::Apostrophe),
            101 => Some(Self::Apps),
            102 => Some(Self::Asterisk),
            103 => Some(Self::At),
            104 => Some(Self::Ax),
            105 => Some(Self::Backslash),
            106 => Some(Self::Calculator),
            107 => Some(Self::Capital),
            108 => Some(Self::Colon),
            109 => Some(Self::Comma),
            110 => Some(Self::Convert),
            111 => Some(Self::Equals),
            112 => Some(Self::Grave),
            113 => Some(Self::Kana),
            114 => Some(Self::Kanji),
            115 => Some(Self::LAlt),
            116 => Some(Self::LBracket),
            117 => Some(Self::LControl),
            118 => Some(Self::LShift),
            119 => Some(Self::LWin),
            120 => Some(Self::Mail),
            121 => Some(Self::MediaSelect),
            122 => Some(Self::MediaStop),
            123 => Some(Self::Minus),
            124 => Some(Self::Mute),
            125 => Some(Self::MyComputer),
            126 => Some(Self::NavigateForward),
            127 => Some(Self::NavigateBackward),
            128 => Some(Self::NextTrack),
            129 => Some(Self::NoConvert),
            130 => Some(Self::OEM102),
            131 => Some(Self::Period),
            132 => Some(Self::PlayPause),
            133 => Some(Self::Plus),
            134 => Some(Self::Power),
            135 => Some(Self::PrevTrack),
            136 => Some(Self::RAlt),
            137 => Some(Self::RBracket),
            138 => Some(Self::RControl),
            139 => Some(Self::RShift),
            140 => Some(Self::RWin),
            141 => Some(Self::Semicolon),
            142 => Some(Self::Slash),
            143 => Some(Self::Sleep),
            144 => Some(Self::Stop),
            145 => Some(Self::Sysrq),
            146 => Some(Self::Tab),
            147 => Some(Self::Underline),
            148 => Some(Self::Unlabeled),
            149 => Some(Self::VolumeDown),
            150 => Some(Self::VolumeUp),
            151 => Some(Self::Wake),
            152 => Some(Self::WebBack),
            153 => Some(Self::WebFavorites),
            154 => Some(Self::WebForward),
            155 => Some(Self::WebHome),
            156 => Some(Self::WebRefresh),
            157 => Some(Self::WebSearch),
            158 => Some(Self::WebStop),
            159 => Some(Self::Yen),
            160 => Some(Self::Copy),
            161 => Some(Self::Paste),
            162 => Some(Self::Cut),
            _ => None,
        }
    }

    #[must_use]
    pub const fn get_lowercase(&self) -> Option<char> {
        use self::VirtualKeyCode::{
            Asterisk, At, Caret, Key0, Key1, Key2, Key3, Key4, Key5, Key6, Key7, Key8, Key9, Minus,
            Numpad0, Numpad1, Numpad2, Numpad3, Numpad4, Numpad5, Numpad6, Numpad7, Numpad8,
            Numpad9, Period, Semicolon, Slash, A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q,
            R, S, T, U, V, W, X, Y, Z,
        };
        match self {
            A => Some('a'),
            B => Some('b'),
            C => Some('c'),
            D => Some('d'),
            E => Some('e'),
            F => Some('f'),
            G => Some('g'),
            H => Some('h'),
            I => Some('i'),
            J => Some('j'),
            K => Some('k'),
            L => Some('l'),
            M => Some('m'),
            N => Some('n'),
            O => Some('o'),
            P => Some('p'),
            Q => Some('q'),
            R => Some('r'),
            S => Some('s'),
            T => Some('t'),
            U => Some('u'),
            V => Some('v'),
            W => Some('w'),
            X => Some('x'),
            Y => Some('y'),
            Z => Some('z'),
            Key0 | Numpad0 => Some('0'),
            Key1 | Numpad1 => Some('1'),
            Key2 | Numpad2 => Some('2'),
            Key3 | Numpad3 => Some('3'),
            Key4 | Numpad4 => Some('4'),
            Key5 | Numpad5 => Some('5'),
            Key6 | Numpad6 => Some('6'),
            Key7 | Numpad7 => Some('7'),
            Key8 | Numpad8 => Some('8'),
            Key9 | Numpad9 => Some('9'),
            Minus => Some('-'),
            Asterisk => Some('*'),
            At => Some('@'),
            Period => Some('.'),
            Semicolon => Some(';'),
            Slash => Some('/'),
            Caret => Some('^'),
            _ => None,
        }
    }
}

/// 16x16x4 bytes icon
#[derive(Debug, Clone)]
#[repr(C)]
pub struct SmallWindowIconBytes {
    pub key: IconKey,
    pub rgba_bytes: U8Vec,
}

/// 32x32x4 bytes icon
#[derive(Debug, Clone)]
#[repr(C)]
pub struct LargeWindowIconBytes {
    pub key: IconKey,
    pub rgba_bytes: U8Vec,
}

// Window icon that usually appears in the top-left corner of the window
#[derive(Debug, Clone)]
#[repr(C, u8)]
pub enum WindowIcon {
    Small(SmallWindowIconBytes),
    /// 32x32x4 bytes icon
    Large(LargeWindowIconBytes),
}

impl_option!(
    WindowIcon,
    OptionWindowIcon,
    copy = false,
    [Debug, Clone, PartialOrd, PartialEq, Eq, Hash, Ord]
);

impl WindowIcon {
    #[must_use]
    pub const fn get_key(&self) -> IconKey {
        match &self {
            Self::Small(SmallWindowIconBytes { key, .. })
            | Self::Large(LargeWindowIconBytes { key, .. }) => *key,
        }
    }
}
// -- Only compare the IconKey (for WindowIcon and TaskBarIcon)

impl PartialEq for WindowIcon {
    fn eq(&self, rhs: &Self) -> bool {
        self.get_key() == rhs.get_key()
    }
}

impl PartialOrd for WindowIcon {
    fn partial_cmp(&self, rhs: &Self) -> Option<Ordering> {
        Some((self.get_key()).cmp(&rhs.get_key()))
    }
}

impl Eq for WindowIcon {}

impl Ord for WindowIcon {
    fn cmp(&self, rhs: &Self) -> Ordering {
        (self.get_key()).cmp(&rhs.get_key())
    }
}

impl Hash for WindowIcon {
    fn hash<H>(&self, state: &mut H)
    where
        H: Hasher,
    {
        self.get_key().hash(state);
    }
}

/// 256x256x4 bytes window icon
#[derive(Debug, Clone)]
#[repr(C)]
pub struct TaskBarIcon {
    pub key: IconKey,
    pub rgba_bytes: U8Vec,
}

impl_option!(
    TaskBarIcon,
    OptionTaskBarIcon,
    copy = false,
    [Debug, Clone, PartialOrd, PartialEq, Eq, Hash, Ord]
);

impl PartialEq for TaskBarIcon {
    fn eq(&self, rhs: &Self) -> bool {
        self.key == rhs.key
    }
}

impl PartialOrd for TaskBarIcon {
    fn partial_cmp(&self, rhs: &Self) -> Option<Ordering> {
        Some((self.key).cmp(&rhs.key))
    }
}

impl Eq for TaskBarIcon {}

impl Ord for TaskBarIcon {
    fn cmp(&self, rhs: &Self) -> Ordering {
        (self.key).cmp(&rhs.key)
    }
}

impl Hash for TaskBarIcon {
    fn hash<H>(&self, state: &mut H)
    where
        H: Hasher,
    {
        self.key.hash(state);
    }
}

/// A built-in system dialog the engine presents on the app's behalf.
///
/// Invoked via `CallbackInfo::invoke_system_dialog`. These dialogs are
/// rendered by azul itself in a new window that is ALWAYS CPU-rendered — a
/// dialog reporting a problem (possibly a GPU problem) must not depend on
/// the GPU working.
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub enum SysDialogType {
    /// "Report a problem": a message box (user text + optional screenshot of
    /// the current window + optional system information) mailed to
    /// `AppConfig.report_problem`, or saved to disk when no address is set.
    ReportProblem,
    /// "Check for updates": runs the update check on a background thread,
    /// shows the release's Markdown changelog, and — only where the install
    /// permits self-update and the user consents — downloads and applies it.
    /// Package-managed installs get a "update via your package manager" note.
    UpdateVersion,
    /// "Data collection": the telemetry consent dialog. Lists EVERY
    /// instrument the app can record with per-metric checkmarks, the four
    /// signal switches (crashes / logs / metrics / app state on crash), and
    /// "remember for all azul apps" (writes the machine-wide shared config).
    TelemetryConsent,
    /// "Graphics check": shows what the engine's GPU probe found (vendor /
    /// renderer / verdict) and, when GPU rendering is unusable, per-platform
    /// driver guidance - for apps that NEED working video acceleration.
    GpuCheck,
}

#[cfg(test)]
#[path = "window_test.rs"]
mod window_test;