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Fix and add comments. Use map_default.

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Junyoung Cho 2013-08-27 18:19:37 +09:00
parent 8cd9a6ba87
commit 729ac0c796
1 changed files with 42 additions and 24 deletions
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66
src/components/main/layout/inline.rs
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@ -665,16 +665,19 @@ impl InlineFlowData {
}
};
// Update the line's y position before setting the box's y position
// since the previous line's height can be modified.
// Set the top y position of the current linebox.
// `line_height_offset` is updated at the end of the previous loop.
line.bounds.origin.y = line.bounds.origin.y + line_height_offset;
// Calculate the distance from baseline to the top of the linebox.
let mut topmost = Au(0);
// Calculate the distance from baseline to the bottom of the linebox.
let mut bottommost = Au(0);
// bottommost of boxes with 'top' value
let mut bottommost_of_top = Au(0);
// topmost of boxes with 'bottom' value
let mut topmost_of_bottom = Au(0);
// Calculate the biggest height among boxes with 'top' value.
let mut biggest_top = Au(0);
// Calculate the biggest height among boxes with 'bottom' value.
let mut biggest_bottom = Au(0);
for box_i in line.range.eachi() {
let cur_box = self.boxes[box_i];
@ -731,18 +734,22 @@ impl InlineFlowData {
let mut top_from_base = top_from_base;
let mut bottom_from_base = bottom_from_base;
// TODO: We should find the top and bottom of the content area of parent box.
// Those are used in text-top and text-bottom value of 'vertex-align'.
// Assume that top is font_size of parent and bottom is 0.
// To calculate text-top and text-bottom value of 'vertex-align',
// we should find the top and bottom of the content area of parent box.
// The content area is defined in "http://www.w3.org/TR/CSS2/visudet.html#inline-non-replaced".
// TODO: We should extract em-box info from font size of parent
// and calcuate the distances from baseline to the top and the bottom of parent's content area.
// It should calculate the distance from baseline to the top of parent's content area.
// But, it is assumed now as font size of parent.
let mut parent_text_top = Au(0);
// It should calculate the distance from baseline to the bottom of parent's content area.
// But, it is assumed now as 0.
let parent_text_bottom = Au(0);
do cur_box.with_mut_base |base| {
//get parent node
let mut parent = base.node;
match base.node.parent_node() {
None => {},
Some(parent_node) => parent = parent_node
}
// Get parent node
let parent = base.node.parent_node().map_default(base.node, |parent| *parent);
// TODO: When the calculation of font-size style is supported, it should be updated.
let font_size = match parent.style().font_size() {
CSSFontSizeLength(Px(length)) => length,
// todo: this is based on a hard coded font size, should be the parent element's font size
@ -752,7 +759,10 @@ impl InlineFlowData {
parent_text_top = Au::from_frac_px(font_size);
}
// This flag decides whether topmost and bottommost are updated or not.
// That is, if the box has top or bottom value, no_update_flag becomes true.
let mut no_update_flag = false;
// Calculate a relative offset from baseline.
let offset = match cur_box.vertical_align() {
CSSVerticalAlignBaseline => {
-ascent
@ -789,16 +799,16 @@ impl InlineFlowData {
(bottom_from_base - prev_bottom_from_base - ascent)
},
CSSVerticalAlignTop => {
if bottommost_of_top < (top_from_base + bottom_from_base) {
bottommost_of_top = top_from_base + bottom_from_base;
if biggest_top < (top_from_base + bottom_from_base) {
biggest_top = top_from_base + bottom_from_base;
}
let offset_top = top_from_base - ascent;
no_update_flag = true;
offset_top
},
CSSVerticalAlignBottom => {
if topmost_of_bottom < (top_from_base + bottom_from_base) {
topmost_of_bottom = top_from_base + bottom_from_base;
if biggest_bottom < (top_from_base + bottom_from_base) {
biggest_bottom = top_from_base + bottom_from_base;
}
let offset_bottom = -(bottom_from_base + ascent);
no_update_flag = true;
@ -819,6 +829,8 @@ impl InlineFlowData {
}
};
// If the current box has 'top' or 'bottom' value, no_update_flag is true.
// Otherwise, topmost and bottomost are updated.
if !no_update_flag && top_from_base > topmost {
topmost = top_from_base;
}
@ -831,20 +843,24 @@ impl InlineFlowData {
}
}
//Offset of boxes with 'bottom' value.
topmost_of_bottom = topmost_of_bottom - bottommost;
// Calculate the distance from baseline to the top of the biggest box with 'bottom' value.
// Then, if necessary, update the topmost.
let topmost_of_bottom = biggest_bottom - bottommost;
if topmost_of_bottom > topmost {
topmost = topmost_of_bottom;
}
//Offset of boxes with 'top' value.
bottommost_of_top = bottommost_of_top - topmost;
// Calculate the distance from baseline to the bottom of the biggest box with 'top' value.
// Then, if necessary, update the bottommost.
let bottommost_of_top = biggest_top - topmost;
if bottommost_of_top > bottommost {
//topmost_of_bottom = topmost_of_bottom - (bottommost_of_top - bottommost);
bottommost = bottommost_of_top;
}
// Now, the baseline offset from the top of linebox is set as topmost.
let baseline_offset = topmost;
// All boxes' y position is updated following the new baseline offset.
for box_i in line.range.eachi() {
let cur_box = self.boxes[box_i];
let adjust_offset = match cur_box.vertical_align() {
@ -863,6 +879,8 @@ impl InlineFlowData {
base.position.origin.y = base.position.origin.y + adjust_offset;
}
}
// This is used to set the top y position of the next linebox in the next loop.
line_height_offset = line_height_offset + topmost + bottommost - line.bounds.size.height;
line.bounds.size.height = topmost + bottommost;
} // End of `lines.each` loop.