From 7cfc4e5146be5666419451bdd516f1f3f264d24a Mon Sep 17 00:00:00 2001
From: Enrico Tassi <gareuselesinge@debian.org>
Date: Sun, 25 Jan 2015 14:42:51 +0100
Subject: Imported Upstream version 8.5~beta1+dfsg

---
 ide/wg_Segment.ml | 143 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 ide/wg_Segment.ml

(limited to 'ide/wg_Segment.ml')

diff --git a/ide/wg_Segment.ml b/ide/wg_Segment.ml
new file mode 100644
index 00000000..8520727a
--- /dev/null
+++ b/ide/wg_Segment.ml
@@ -0,0 +1,143 @@
+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+open Util
+
+type color = GDraw.color
+
+module Segment :
+sig
+  type +'a t
+  val length : 'a t -> int
+  val resize : 'a t -> int -> 'a t
+  val empty : 'a t
+  val add : int -> 'a -> 'a t -> 'a t
+  val remove : int -> 'a t -> 'a t
+  val fold : ('a -> 'a -> bool) -> (int -> int -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'b
+end =
+struct
+  type 'a t = {
+    length : int;
+    content : 'a Int.Map.t;
+  }
+
+  let empty = { length = 0; content = Int.Map.empty }
+
+  let length s = s.length
+
+  let resize s len =
+    if s.length <= len then { s with length = len }
+    else
+      let filter i v = i < len in
+      { length = len; content = Int.Map.filter filter s.content }
+
+  let add i v s =
+    if i < s.length then
+      { s with content = Int.Map.add i v s.content }
+    else s
+
+  let remove i s = { s with content = Int.Map.remove i s.content }
+
+  let fold eq f s accu =
+    let make k v (cur, accu) = match cur with
+    | None -> Some (k, k, v), accu
+    | Some (i, j, w) ->
+      if k = j + 1 && eq v w then Some (i, k, w), accu
+      else Some (k, k, v), (i, j, w) :: accu
+    in
+    let p, segments = Int.Map.fold make s.content (None, []) in
+    let segments = match p with
+    | None -> segments
+    | Some p -> p :: segments
+    in
+    List.fold_left (fun accu (i, j, v) -> f i j v accu) accu segments
+
+end
+
+let i2f = float_of_int
+let f2i = int_of_float
+
+let color_eq (c1 : GDraw.color) (c2 : GDraw.color) = match c1, c2 with
+| `BLACK, `BLACK -> true
+| `COLOR c1, `COLOR c2 -> c1 == c2
+| `NAME s1, `NAME s2 -> String.equal s1 s2
+| `RGB (r1, g1, b1), `RGB (r2, g2, b2) -> r1 = r2 && g1 = g2 && b1 = b2
+| `WHITE, `WHITE -> true
+| _ -> false
+
+class segment () =
+let box = GBin.frame () in
+let draw = GMisc.image ~packing:box#add () in
+object (self)
+
+  inherit GObj.widget box#as_widget
+
+  val mutable width = 1
+  val mutable height = 20
+  val mutable data = Segment.empty
+  val mutable default : color = `WHITE
+  val mutable pixmap : GDraw.pixmap = GDraw.pixmap ~width:1 ~height:1 ()
+
+  initializer
+    box#misc#set_size_request ~height ();
+    let cb rect =
+      let w = rect.Gtk.width in
+      let h = rect.Gtk.height in
+      (** Only refresh when size actually changed, otherwise loops *)
+      if self#misc#visible && (width <> w || height <> h) then begin
+        width <- w;
+        height <- h;
+        self#redraw ();
+      end
+    in
+    let _ = box#misc#connect#size_allocate cb in
+    (** Initial pixmap *)
+    draw#set_pixmap pixmap
+
+  method length = Segment.length data
+
+  method set_length len =
+    data <- Segment.resize data len;
+    if self#misc#visible then self#refresh ()
+
+  method private fill_range color i j =
+    let i = i2f i in
+    let j = i2f j in
+    let width = i2f width in
+    let len = i2f (Segment.length data) in
+    let x = f2i ((i *. width) /. len) in
+    let x' = f2i ((j *. width) /. len) in
+    let w = x' - x in
+    pixmap#set_foreground color;
+    pixmap#rectangle ~x ~y:0 ~width:w ~height ~filled:true ();
+    draw#set_mask None;
+
+  method add i color =
+    data <- Segment.add i color data;
+    if self#misc#visible then self#fill_range color i (i + 1)
+
+  method remove i =
+    data <- Segment.remove i data;
+    if self#misc#visible then self#fill_range default i (i + 1)
+
+  method set_default_color color = default <- color
+  method default_color = default
+
+  method private redraw () =
+    pixmap <- GDraw.pixmap ~width ~height ();
+    draw#set_pixmap pixmap;
+    self#refresh ();
+
+  method private refresh () =
+    pixmap#set_foreground default;
+    pixmap#rectangle ~x:0 ~y:0 ~width ~height ~filled:true ();
+    let fold i j v () = self#fill_range v i (j + 1) in
+    Segment.fold color_eq fold data ();
+    draw#set_mask None;
+
+end
-- 
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