1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133

/* 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 https://mozilla.org/MPL/2.0/. */

//! CSS table formatting contexts.

use std::fmt;

use app_units::Au;
use euclid::default::Point2D;
use style::logical_geometry::LogicalSize;
use style::properties::ComputedValues;
use style::values::computed::Size;

use crate::context::LayoutContext;
use crate::display_list::{DisplayListBuildState, StackingContextCollectionState};
use crate::flow::{BaseFlow, Flow, FlowClass, ForceNonfloatedFlag, OpaqueFlow};
use crate::fragment::{Fragment, FragmentBorderBoxIterator, Overflow};
use crate::{layout_debug, layout_debug_scope};

#[allow(unsafe_code)]
unsafe impl crate::flow::HasBaseFlow for TableColGroupFlow {}

/// A table formatting context.
#[repr(C)]
pub struct TableColGroupFlow {
    /// Data common to all flows.
    pub base: BaseFlow,

    /// The associated fragment.
    pub fragment: Option<Fragment>,

    /// The table column fragments
    pub cols: Vec<Fragment>,

    /// The specified inline-sizes of table columns. (We use `LengthPercentageOrAuto` here in
    /// lieu of `ColumnInlineSize` because column groups do not establish minimum or preferred
    /// inline sizes.)
    pub inline_sizes: Vec<Size>,
}

impl TableColGroupFlow {
    pub fn from_fragments(fragment: Fragment, fragments: Vec<Fragment>) -> TableColGroupFlow {
        let writing_mode = fragment.style().writing_mode;
        TableColGroupFlow {
            base: BaseFlow::new(
                Some(fragment.style()),
                writing_mode,
                ForceNonfloatedFlag::ForceNonfloated,
            ),
            fragment: Some(fragment),
            cols: fragments,
            inline_sizes: vec![],
        }
    }
}

impl Flow for TableColGroupFlow {
    fn class(&self) -> FlowClass {
        FlowClass::TableColGroup
    }

    fn as_mut_table_colgroup(&mut self) -> &mut TableColGroupFlow {
        self
    }

    fn as_table_colgroup(&self) -> &TableColGroupFlow {
        self
    }

    fn bubble_inline_sizes(&mut self) {
        let _scope = layout_debug_scope!(
            "table_colgroup::bubble_inline_sizes {:x}",
            self.base.debug_id()
        );

        for fragment in &self.cols {
            // Retrieve the specified value from the appropriate CSS property.
            let inline_size = fragment.style().content_inline_size();
            for _ in 0..fragment.column_span() {
                self.inline_sizes.push(inline_size.clone())
            }
        }
    }

    /// Table column inline-sizes are assigned in the table flow and propagated to table row flows
    /// and/or rowgroup flows. Therefore, table colgroup flows do not need to assign inline-sizes.
    fn assign_inline_sizes(&mut self, _: &LayoutContext) {}

    /// Table columns do not have block-size.
    fn assign_block_size(&mut self, _: &LayoutContext) {}

    fn update_late_computed_inline_position_if_necessary(&mut self, _: Au) {}

    fn update_late_computed_block_position_if_necessary(&mut self, _: Au) {}

    // Table columns are invisible.
    fn build_display_list(&mut self, _: &mut DisplayListBuildState) {}

    fn collect_stacking_contexts(&mut self, state: &mut StackingContextCollectionState) {
        self.base.stacking_context_id = state.current_stacking_context_id;
        self.base.clipping_and_scrolling = Some(state.current_clipping_and_scrolling);
    }

    fn repair_style(&mut self, _: &crate::ServoArc<ComputedValues>) {}

    fn compute_overflow(&self) -> Overflow {
        Overflow::new()
    }

    fn generated_containing_block_size(&self, _: OpaqueFlow) -> LogicalSize<Au> {
        panic!("Table column groups can't be containing blocks!")
    }

    fn iterate_through_fragment_border_boxes(
        &self,
        _: &mut dyn FragmentBorderBoxIterator,
        _: i32,
        _: &Point2D<Au>,
    ) {
    }

    fn mutate_fragments(&mut self, _: &mut dyn FnMut(&mut Fragment)) {}
}

impl fmt::Debug for TableColGroupFlow {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self.fragment {
            Some(ref rb) => write!(f, "TableColGroupFlow: {:?}", rb),
            None => write!(f, "TableColGroupFlow"),
        }
    }
}