From 8b80e15fd0353872eca1d4bd22e5b5df74401c83 Mon Sep 17 00:00:00 2001
From: "Brian J. Burg" <burg@cs.washington.edu>
Date: Mon, 15 Oct 2012 15:09:57 -0700
Subject: [PATCH] Add stubs for box-splitting.

---
 src/servo/layout/box.rs  | 20 ++++++++++++++++++++
 src/servo/layout/text.rs | 11 ++++++++++-
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/src/servo/layout/box.rs b/src/servo/layout/box.rs
index 57578ddb188..8cf6cad3add 100644
--- a/src/servo/layout/box.rs
+++ b/src/servo/layout/box.rs
@@ -91,6 +91,13 @@ pub enum RenderBox {
     UnscannedTextBox(RenderBoxData, ~str)
 }
 
+enum SplitBoxResult {
+    CannotSplit(@RenderBox),
+    SplitUnnecessary(@RenderBox),
+    SplitDidFit(@RenderBox, @RenderBox),
+    SplitDidNotFit(@RenderBox, @RenderBox)
+}
+
 enum InlineSpacerSide {
     LogicalBefore,
     LogicalAfter,
@@ -107,6 +114,7 @@ trait RenderBoxMethods {
     pure fn content_box() -> Rect<au>;
     pure fn border_box() -> Rect<au>;
 
+    fn split_to_width(@self, &LayoutContext, au) -> SplitBoxResult;
     fn get_min_width(&LayoutContext) -> au;
     fn get_pref_width(&LayoutContext) -> au;
     fn get_used_width() -> (au, au);
@@ -167,6 +175,18 @@ impl RenderBox : RenderBoxMethods {
         }
     }
 
+    fn split_to_width(@self, _ctx: &LayoutContext, _max_width: au) -> SplitBoxResult {
+        // TODO: finish
+        CannotSplit(self)
+/*        match self {
+            @GenericBox(*) => CannotSplit(self),
+            @ImageBox(*) => CannotSplit(self),
+            @TextBox(*) => {
+            }
+        }
+*/
+    }
+
     /** In general, these functions are transitively impure because they
      * may cause glyphs to be allocated. For now, it's impure because of 
      * holder.get_image()
diff --git a/src/servo/layout/text.rs b/src/servo/layout/text.rs
index 095d5b6ae6f..3b8638888f3 100644
--- a/src/servo/layout/text.rs
+++ b/src/servo/layout/text.rs
@@ -5,7 +5,7 @@ use au::au;
 use geom::size::Size2D;
 use servo_text::text_run::TextRun;
 use servo_text::font_cache::FontCache;
-use layout::box::{TextBox, RenderBox, UnscannedTextBox};
+use layout::box::{TextBox, RenderBox, RenderBoxData, UnscannedTextBox};
 use layout::context::LayoutContext;
 
 pub struct TextBoxData {
@@ -22,6 +22,15 @@ pub fn TextBoxData(run: @TextRun, offset: uint, length: uint) -> TextBoxData {
     }
 }
 
+pub fn adapt_textbox_with_range(box_data: &RenderBoxData, run: @TextRun, 
+                                offset: uint, length: uint) -> @RenderBox {
+    let new_box_data = copy *box_data;
+    let new_text_data = TextBoxData(run, offset, length);
+    @TextBox(move new_box_data, move new_text_data)
+    // TODO: set position based on run metrics
+    //new_box_data.position.size = { width: run.font
+}
+
 trait UnscannedMethods {
     pure fn raw_text() -> ~str;
 }