/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

use atomic_refcell::AtomicRefCell;

use construct::ConstructionResult;

use script_layout_interface::StyleData;

#[repr(C)]

pub struct StyleAndLayoutData {

    /// Data accessed by script_layout_interface. This must be first to allow

    /// casting between StyleAndLayoutData and StyleData.

    pub style_data: StyleData,

    /// The layout data associated with a node.

    pub layout_data: AtomicRefCell<LayoutData>,

}

impl StyleAndLayoutData {

    pub fn new() -> Self {

        Self {

            style_data: StyleData::new(),

            layout_data: AtomicRefCell::new(LayoutData::new()),

        }

    }

}

/// Data that layout associates with a node.

#[repr(C)]

pub struct LayoutData {

    /// The current results of flow construction for this node. This is either a

    /// flow or a `ConstructionItem`. See comments in `construct.rs` for more

    /// details.

    pub flow_construction_result: ConstructionResult,

    pub before_flow_construction_result: ConstructionResult,

    pub after_flow_construction_result: ConstructionResult,

    pub details_summary_flow_construction_result: ConstructionResult,

    pub details_content_flow_construction_result: ConstructionResult,

    /// Various flags.

    pub flags: LayoutDataFlags,

}

impl LayoutData {

    /// Creates new layout data.

    pub fn new() -> LayoutData {

        Self {

            flow_construction_result: ConstructionResult::None,

            before_flow_construction_result: ConstructionResult::None,

            after_flow_construction_result: ConstructionResult::None,

            details_summary_flow_construction_result: ConstructionResult::None,

            details_content_flow_construction_result: ConstructionResult::None,

            flags: LayoutDataFlags::empty(),

        }

    }

}

bitflags! {

    pub struct LayoutDataFlags: u8 {

        #[doc = "Whether a flow has been newly constructed."]

        const HAS_NEWLY_CONSTRUCTED_FLOW = 0x01;

        #[doc = "Whether this node has been traversed by layout."]

        const HAS_BEEN_TRAVERSED = 0x02;

    }

}