From d35f4ceebd9f6467ea233a45ae67eead964899bb Mon Sep 17 00:00:00 2001
From: Robby Findler <robby@racket-lang.org>
Date: Wed, 28 Nov 2012 17:46:54 -0600
Subject: [PATCH] adjust the anchor message, keyboard recording message, and
 overwrite message so they don't take up space when they aren't being shown
 (to reduce the minimum width of the window)

original commit: a45f94b58ba2aee49c830ecc6379b23ace0c9b16
---
 collects/framework/private/frame.rkt | 84 +++++++++++++++-------------
 1 file changed, 46 insertions(+), 38 deletions(-)

diff --git a/collects/framework/private/frame.rkt b/collects/framework/private/frame.rkt
index 12cfbc8b..5eca1427 100644
--- a/collects/framework/private/frame.rkt
+++ b/collects/framework/private/frame.rkt
@@ -1038,7 +1038,9 @@
     (define/private (update-macro-recording-icon)
       (unless (eq? (send macro-recording-message is-shown?)
                    macro-recording?)
-        (send macro-recording-message show macro-recording?)))
+        (if macro-recording?
+            (add-uncommon-child macro-recording-message)
+            (remove-uncommon-child macro-recording-message))))
     (define/public (set-macro-recording on?)
       (set! macro-recording? on?)
       (update-macro-recording-icon))
@@ -1049,16 +1051,16 @@
              (λ ()
                (unless (eq? anchor-last-state? #f)
                  (set! anchor-last-state? #f)
-                 (send anchor-message show #f)))])
+                 (remove-uncommon-child anchor-message)))])
         (cond
           [info-edit
            (let ([anchor-now? (send info-edit get-anchor)])
              (unless (eq? anchor-now? anchor-last-state?)
                (cond
                  [(object? anchor-message)
-                  (send anchor-message
-                        show
-                        anchor-now?)
+                  (if anchor-now?
+                      (add-uncommon-child anchor-message)
+                      (remove-uncommon-child anchor-message))
                   (set! anchor-last-state? anchor-now?)]
                  [else (failed)])))]
           [else
@@ -1072,16 +1074,16 @@
             [failed
              (λ ()
                (set! overwrite-last-state? #f)
-               (send overwrite-message show #f))])
+               (remove-uncommon-child overwrite-message))])
         (cond
           [info-edit
            (let ([overwrite-now? (send info-edit get-overwrite-mode)])
              (unless (eq? overwrite-now? overwrite-last-state?)
                (cond
                  [(object? overwrite-message)
-                  (send overwrite-message
-                        show
-                        overwrite-now?)
+                  (if overwrite-now?
+                      (add-uncommon-child overwrite-message)
+                      (remove-uncommon-child overwrite-message))
                   (set! overwrite-last-state? overwrite-now?)]
                  [else
                   (failed)])))]
@@ -1140,37 +1142,43 @@
           (λ (l)
             (cons file-text-mode-msg-parent (remq file-text-mode-msg-parent l))))
     
-    (define-values (anchor-message
-                    overwrite-message 
-                    macro-recording-message)
-      (let* ([anchor-message
-              (new message%
-                   [font small-control-font]
-                   [label (string-constant auto-extend-selection)]
-                   [parent (get-info-panel)])]
-             [overwrite-message 
-              (new message%
-                   [font small-control-font]
-                   [label (string-constant overwrite)]
-                   [parent (get-info-panel)])]
-             [macro-recording-message
-              (new message%
-                   [label "c-x;("]
-                   [font small-control-font]
-                   [parent (get-info-panel)])]
-             [msgs (list anchor-message
-                         overwrite-message
-                         macro-recording-message)])
-        (send (get-info-panel) change-children
-              (λ (l) (append msgs (remq* msgs l))))
-        (values anchor-message
-                overwrite-message 
-                macro-recording-message)))
+    (define uncommon-parent (new horizontal-panel%
+                                 [parent (get-info-panel)]
+                                 [stretchable-width #f]))
     
+    (send (get-info-panel) change-children
+          (λ (l) (cons uncommon-parent (remq uncommon-parent l))))
+    (define anchor-message
+      (new message%
+           [font small-control-font]
+           [label (string-constant auto-extend-selection)]
+           [parent uncommon-parent]))
+    (define overwrite-message 
+      (new message%
+           [font small-control-font]
+           [label (string-constant overwrite)]
+           [parent uncommon-parent]))
+    (define macro-recording-message
+      (new message%
+           [label "c-x;("]
+           [font small-control-font]
+           [parent uncommon-parent]))
+    (define/private (remove-uncommon-child c)
+      (send uncommon-parent change-children
+            (λ (l) (remq c l))))
+    (define/private (add-uncommon-child c)
+      (define (child->num c)
+        (cond
+          [(eq? c anchor-message) 0]
+          [(eq? c overwrite-message) 1]
+          [(eq? c macro-recording-message) 2]))
+      (send uncommon-parent change-children
+            (λ (l) (sort (cons c (remq c l))
+                         <
+                         #:key child->num))))
+
     (inherit determine-width)
-    (send macro-recording-message show #f)
-    (send anchor-message show #f)
-    (send overwrite-message show #f)
+    (send uncommon-parent change-children (λ (l) '()))
     (editor-position-changed)
     (use-file-text-mode-changed)))