Cargoify servo

components/layout/table.rs

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+/* 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/. */
+
+//! CSS table formatting contexts.
+
+#![deny(unsafe_block)]
+
+use block::{BlockFlow, MarginsMayNotCollapse, ISizeAndMarginsComputer};
+use block::{ISizeConstraintInput, ISizeConstraintSolution};
+use construct::FlowConstructor;
+use context::LayoutContext;
+use floats::FloatKind;
+use flow::{TableFlowClass, FlowClass, Flow, ImmutableFlowUtils};
+use fragment::Fragment;
+use table_wrapper::{TableLayout, FixedLayout, AutoLayout};
+use wrapper::ThreadSafeLayoutNode;
+
+use servo_util::geometry::Au;
+use servo_util::geometry;
+use std::fmt;
+use style::computed_values::table_layout;
+
+/// A table flow corresponded to the table's internal table fragment under a table wrapper flow.
+/// The properties `position`, `float`, and `margin-*` are used on the table wrapper fragment,
+/// not table fragment per CSS 2.1 § 10.5.
+pub struct TableFlow {
+    pub block_flow: BlockFlow,
+
+    /// Column inline-sizes
+    pub col_inline_sizes: Vec<Au>,
+
+    /// Column min inline-sizes.
+    pub col_min_inline_sizes: Vec<Au>,
+
+    /// Column pref inline-sizes.
+    pub col_pref_inline_sizes: Vec<Au>,
+
+    /// Table-layout property
+    pub table_layout: TableLayout,
+}
+
+impl TableFlow {
+    pub fn from_node_and_fragment(node: &ThreadSafeLayoutNode,
+                                  fragment: Fragment)
+                                  -> TableFlow {
+        let mut block_flow = BlockFlow::from_node_and_fragment(node, fragment);
+        let table_layout = if block_flow.fragment().style().get_table().table_layout ==
+                              table_layout::fixed {
+            FixedLayout
+        } else {
+            AutoLayout
+        };
+        TableFlow {
+            block_flow: block_flow,
+            col_inline_sizes: vec!(),
+            col_min_inline_sizes: vec!(),
+            col_pref_inline_sizes: vec!(),
+            table_layout: table_layout
+        }
+    }
+
+    pub fn from_node(constructor: &mut FlowConstructor,
+                     node: &ThreadSafeLayoutNode)
+                     -> TableFlow {
+        let mut block_flow = BlockFlow::from_node(constructor, node);
+        let table_layout = if block_flow.fragment().style().get_table().table_layout ==
+                              table_layout::fixed {
+            FixedLayout
+        } else {
+            AutoLayout
+        };
+        TableFlow {
+            block_flow: block_flow,
+            col_inline_sizes: vec!(),
+            col_min_inline_sizes: vec!(),
+            col_pref_inline_sizes: vec!(),
+            table_layout: table_layout
+        }
+    }
+
+    pub fn float_from_node(constructor: &mut FlowConstructor,
+                           node: &ThreadSafeLayoutNode,
+                           float_kind: FloatKind)
+                           -> TableFlow {
+        let mut block_flow = BlockFlow::float_from_node(constructor, node, float_kind);
+        let table_layout = if block_flow.fragment().style().get_table().table_layout ==
+                              table_layout::fixed {
+            FixedLayout
+        } else {
+            AutoLayout
+        };
+        TableFlow {
+            block_flow: block_flow,
+            col_inline_sizes: vec!(),
+            col_min_inline_sizes: vec!(),
+            col_pref_inline_sizes: vec!(),
+            table_layout: table_layout
+        }
+    }
+
+    /// Update the corresponding value of self_inline-sizes if a value of kid_inline-sizes has larger value
+    /// than one of self_inline-sizes.
+    pub fn update_col_inline_sizes(self_inline_sizes: &mut Vec<Au>, kid_inline_sizes: &Vec<Au>) -> Au {
+        let mut sum_inline_sizes = Au(0);
+        let mut kid_inline_sizes_it = kid_inline_sizes.iter();
+        for self_inline_size in self_inline_sizes.mut_iter() {
+            match kid_inline_sizes_it.next() {
+                Some(kid_inline_size) => {
+                    if *self_inline_size < *kid_inline_size {
+                        *self_inline_size = *kid_inline_size;
+                    }
+                },
+                None => {}
+            }
+            sum_inline_sizes = sum_inline_sizes + *self_inline_size;
+        }
+        sum_inline_sizes
+    }
+
+    /// Assign block-size for table flow.
+    ///
+    /// TODO(#2014, pcwalton): This probably doesn't handle margin collapse right.
+    ///
+    /// inline(always) because this is only ever called by in-order or non-in-order top-level
+    /// methods
+    #[inline(always)]
+    fn assign_block_size_table_base<'a>(&mut self, layout_context: &'a LayoutContext<'a>) {
+        self.block_flow.assign_block_size_block_base(layout_context, MarginsMayNotCollapse);
+    }
+
+    pub fn build_display_list_table(&mut self, layout_context: &LayoutContext) {
+        debug!("build_display_list_table: same process as block flow");
+        self.block_flow.build_display_list_block(layout_context);
+    }
+}
+
+impl Flow for TableFlow {
+    fn class(&self) -> FlowClass {
+        TableFlowClass
+    }
+
+    fn as_table<'a>(&'a mut self) -> &'a mut TableFlow {
+        self
+    }
+
+    fn as_block<'a>(&'a mut self) -> &'a mut BlockFlow {
+        &mut self.block_flow
+    }
+
+    fn col_inline_sizes<'a>(&'a mut self) -> &'a mut Vec<Au> {
+        &mut self.col_inline_sizes
+    }
+
+    fn col_min_inline_sizes<'a>(&'a self) -> &'a Vec<Au> {
+        &self.col_min_inline_sizes
+    }
+
+    fn col_pref_inline_sizes<'a>(&'a self) -> &'a Vec<Au> {
+        &self.col_pref_inline_sizes
+    }
+
+    /// The specified column inline-sizes are set from column group and the first row for the fixed
+    /// table layout calculation.
+    /// The maximum min/pref inline-sizes of each column are set from the rows for the automatic
+    /// table layout calculation.
+    fn bubble_inline_sizes(&mut self, _: &LayoutContext) {
+        let mut min_inline_size = Au(0);
+        let mut pref_inline_size = Au(0);
+        let mut did_first_row = false;
+
+        for kid in self.block_flow.base.child_iter() {
+            assert!(kid.is_proper_table_child());
+
+            if kid.is_table_colgroup() {
+                self.col_inline_sizes.push_all(kid.as_table_colgroup().inline_sizes.as_slice());
+                self.col_min_inline_sizes = self.col_inline_sizes.clone();
+                self.col_pref_inline_sizes = self.col_inline_sizes.clone();
+            } else if kid.is_table_rowgroup() || kid.is_table_row() {
+                // read column inline-sizes from table-row-group/table-row, and assign
+                // inline-size=0 for the columns not defined in column-group
+                // FIXME: need to read inline-sizes from either table-header-group OR
+                // first table-row
+                match self.table_layout {
+                    FixedLayout => {
+                        let kid_col_inline_sizes = kid.col_inline_sizes();
+                        if !did_first_row {
+                            did_first_row = true;
+                            let mut child_inline_sizes = kid_col_inline_sizes.iter();
+                            for col_inline_size in self.col_inline_sizes.mut_iter() {
+                                match child_inline_sizes.next() {
+                                    Some(child_inline_size) => {
+                                        if *col_inline_size == Au::new(0) {
+                                            *col_inline_size = *child_inline_size;
+                                        }
+                                    },
+                                    None => break
+                                }
+                            }
+                        }
+                        let num_child_cols = kid_col_inline_sizes.len();
+                        let num_cols = self.col_inline_sizes.len();
+                        debug!("table until the previous row has {} column(s) and this row has {} column(s)",
+                               num_cols, num_child_cols);
+                        for i in range(num_cols, num_child_cols) {
+                            self.col_inline_sizes.push((*kid_col_inline_sizes)[i]);
+                        }
+                    },
+                    AutoLayout => {
+                        min_inline_size = TableFlow::update_col_inline_sizes(&mut self.col_min_inline_sizes, kid.col_min_inline_sizes());
+                        pref_inline_size = TableFlow::update_col_inline_sizes(&mut self.col_pref_inline_sizes, kid.col_pref_inline_sizes());
+
+                        // update the number of column inline-sizes from table-rows.
+                        let num_cols = self.col_min_inline_sizes.len();
+                        let num_child_cols = kid.col_min_inline_sizes().len();
+                        debug!("table until the previous row has {} column(s) and this row has {} column(s)",
+                               num_cols, num_child_cols);
+                        for i in range(num_cols, num_child_cols) {
+                            self.col_inline_sizes.push(Au::new(0));
+                            let new_kid_min = kid.col_min_inline_sizes()[i];
+                            self.col_min_inline_sizes.push( new_kid_min );
+                            let new_kid_pref = kid.col_pref_inline_sizes()[i];
+                            self.col_pref_inline_sizes.push( new_kid_pref );
+                            min_inline_size = min_inline_size + new_kid_min;
+                            pref_inline_size = pref_inline_size + new_kid_pref;
+                        }
+                    }
+                }
+            }
+        }
+        self.block_flow.base.intrinsic_inline_sizes.minimum_inline_size = min_inline_size;
+        self.block_flow.base.intrinsic_inline_sizes.preferred_inline_size =
+            geometry::max(min_inline_size, pref_inline_size);
+    }
+
+    /// Recursively (top-down) determines the actual inline-size of child contexts and fragments. When
+    /// called on this context, the context has had its inline-size set by the parent context.
+    fn assign_inline_sizes(&mut self, ctx: &LayoutContext) {
+        debug!("assign_inline_sizes({}): assigning inline_size for flow", "table");
+
+        // The position was set to the containing block by the flow's parent.
+        let containing_block_inline_size = self.block_flow.base.position.size.inline;
+
+        let mut num_unspecified_inline_sizes = 0;
+        let mut total_column_inline_size = Au::new(0);
+        for col_inline_size in self.col_inline_sizes.iter() {
+            if *col_inline_size == Au::new(0) {
+                num_unspecified_inline_sizes += 1;
+            } else {
+                total_column_inline_size = total_column_inline_size.add(col_inline_size);
+            }
+        }
+
+        let inline_size_computer = InternalTable;
+        inline_size_computer.compute_used_inline_size(&mut self.block_flow, ctx, containing_block_inline_size);
+
+        let inline_start_content_edge = self.block_flow.fragment.border_padding.inline_start;
+        let padding_and_borders = self.block_flow.fragment.border_padding.inline_start_end();
+        let content_inline_size = self.block_flow.fragment.border_box.size.inline - padding_and_borders;
+
+        match self.table_layout {
+            FixedLayout => {
+                // In fixed table layout, we distribute extra space among the unspecified columns if there are
+                // any, or among all the columns if all are specified.
+                if (total_column_inline_size < content_inline_size) && (num_unspecified_inline_sizes == 0) {
+                    let ratio = content_inline_size.to_f64().unwrap() / total_column_inline_size.to_f64().unwrap();
+                    for col_inline_size in self.col_inline_sizes.mut_iter() {
+                        *col_inline_size = (*col_inline_size).scale_by(ratio);
+                    }
+                } else if num_unspecified_inline_sizes != 0 {
+                    let extra_column_inline_size = (content_inline_size - total_column_inline_size) / Au::new(num_unspecified_inline_sizes);
+                    for col_inline_size in self.col_inline_sizes.mut_iter() {
+                        if *col_inline_size == Au(0) {
+                            *col_inline_size = extra_column_inline_size;
+                        }
+                    }
+                }
+            }
+            _ => {}
+        }
+
+        self.block_flow.propagate_assigned_inline_size_to_children(inline_start_content_edge, content_inline_size, Some(self.col_inline_sizes.clone()));
+    }
+
+    fn assign_block_size<'a>(&mut self, ctx: &'a LayoutContext<'a>) {
+        debug!("assign_block_size: assigning block_size for table");
+        self.assign_block_size_table_base(ctx);
+    }
+
+    fn compute_absolute_position(&mut self) {
+        self.block_flow.compute_absolute_position()
+    }
+}
+
+impl fmt::Show for TableFlow {
+    /// Outputs a debugging string describing this table flow.
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "TableFlow: {}", self.block_flow)
+    }
+}
+
+/// Table, TableRowGroup, TableRow, TableCell types.
+/// Their inline-sizes are calculated in the same way and do not have margins.
+pub struct InternalTable;
+
+impl ISizeAndMarginsComputer for InternalTable {
+    /// Compute the used value of inline-size, taking care of min-inline-size and max-inline-size.
+    ///
+    /// CSS Section 10.4: Minimum and Maximum inline-sizes
+    fn compute_used_inline_size(&self,
+                          block: &mut BlockFlow,
+                          ctx: &LayoutContext,
+                          parent_flow_inline_size: Au) {
+        let input = self.compute_inline_size_constraint_inputs(block, parent_flow_inline_size, ctx);
+        let solution = self.solve_inline_size_constraints(block, &input);
+        self.set_inline_size_constraint_solutions(block, solution);
+    }
+
+    /// Solve the inline-size and margins constraints for this block flow.
+    fn solve_inline_size_constraints(&self, _: &mut BlockFlow, input: &ISizeConstraintInput)
+                               -> ISizeConstraintSolution {
+        ISizeConstraintSolution::new(input.available_inline_size, Au::new(0), Au::new(0))
+    }
+}