..

original commit: 4079dc8a87a4b3754da97f60457162c0c04ad005

collects/framework/framework.ss

@@ -733,6 +733,12 @@
     "Sets the selection of the recently opened file to"
     "\\var{start} and \\var{end}.")
    
+   (handler:size-recently-opened-files
+    (number? . -> . void?)
+    (num)
+    "Sizes the 'framework:recently-opened-files/pos preference"
+    "list length to \\var{num}.")
+
    (icon:get-paren-highlight-bitmap
     (-> (is-a?/c bitmap%))
     ()

collects/framework/private/frame.ss

@@ -897,6 +897,7 @@
                            [canceled? (cancel-due-to-unsaved-changes editor)])
                       (unless canceled?
                         (send editor begin-edit-sequence)
+                        (send editor lock #f)
                         (send editor set-filename #f)
                         (send editor erase)
                         (send editor set-modified #f)
@@ -965,7 +966,10 @@
                          filename 
                          (send editor get-start-position)
                          (send editor get-end-position))))))
+                (send editor begin-edit-sequence)
+                (send editor lock #f)
                 (send editor load-file filename)
+                (send editor end-edit-sequence)
 		(void))))
           
           (inherit get-label)

collects/framework/private/handler.ss

@@ -144,8 +144,6 @@
 
       ;; type recent-list-item = (list/p string? number? number?)
       
-      (define recent-max-count 50)
-
       ;; add-to-recent : string -> void
       (define (add-to-recent filename)
         (let* ([old-list (preferences:get 'framework:recently-opened-files/pos)]
@@ -157,7 +155,7 @@
                               (if old-ent (cadr old-ent) 0)
                               (if old-ent (caddr old-ent) 0))]
                [added-in (cons new-ent (remove new-ent old-list compare-recent-list-items))]
-               [new-recent (size-down added-in)])
+               [new-recent (size-down added-in (preferences:get 'framework:recent-max-count))])
           (preferences:set 'framework:recently-opened-files/pos new-recent)))
       
       ;; compare-recent-list-items : recent-list-item recent-list-item -> boolean
@@ -167,8 +165,8 @@
       ;; size-down : (listof X) -> (listof X)[< recent-max-count]
       ;; takes a list of stuff and returns the
       ;; front of the list, up to `recent-max-count' items
-      (define (size-down new-recent)
+      (define (size-down new-recent n)
-        (let loop ([n recent-max-count]
+        (let loop ([n n]
                    [new-recent new-recent])
           (cond
             [(zero? n) null]
@@ -178,6 +176,15 @@
                    (loop (- n 1)
                          (cdr new-recent)))])))
       
+      ;; size-recently-opened-files : number -> void
+      ;; sets the recently-opened-files/pos preference
+      ;; to a size limited by `n'
+      (define (size-recently-opened-files n)
+         (preferences:set
+          'framework:recently-opened-files/pos
+          (size-down (preferences:get 'framework:recently-opened-files/pos)
+                     n)))       
+      
       ;; set-recent-position : string number number -> void
       ;; updates the recent menu preferences 
       ;; with the positions `start' and `end'

collects/framework/private/main.ss

@@ -14,9 +14,20 @@
       (import mred^
 	      [preferences : framework:preferences^]
 	      [exit : framework:exit^]
-	      [group : framework:group^])
+	      [group : framework:group^]
+              [handler : framework:handler^])
       
       ;; preferences
+      (preferences:set-default 'framework:recent-max-count 
+                               50 
+                               (lambda (x) (and (number? x)
+                                                (x . > . 0) 
+                                                (integer? x))))
+      (preferences:add-callback
+       'framework:recent-max-count
+       (lambda (p v)
+         (handler:size-recently-opened-files v)))
+      
       (preferences:set-default 'framework:last-url-string "" string?)
       (preferences:set-default 'framework:recently-opened-sort-by 'age 
                                (lambda (x) (or (eq? x 'age) (eq? x 'name))))

collects/framework/private/preferences.ss

@@ -374,6 +374,21 @@
                         (lambda (p v)
                           (send c set-value (pref->bool v))))))
 
+      (define (make-recent-items-slider parent)
+        (let ([slider (instantiate slider% ()
+                        (parent parent)
+                        (label (string-constant number-of-open-recent-items))
+                        (min-value 1)
+                        (max-value 100)
+                        (init-value (get 'framework:recent-max-count))
+                        (callback (lambda (slider y)
+                                    (set 'framework:recent-max-count
+                                         (send slider get-value)))))])
+          (add-callback
+           'framework:recent-max-count
+           (lambda (p v)
+             (send slider set-value v)))))
+      
       (define (add-scheme-checkbox-panel)
         (letrec ([add-scheme-checkbox-panel
                   (lambda ()
@@ -403,6 +418,7 @@
                     (add-checkbox-panel 
                      (string-constant editor-prefs-panel-label)
                      (lambda (editor-panel)
+                       (make-recent-items-slider editor-panel)
                        (make-check editor-panel
                                    'framework:autosaving-on? 
                                    (string-constant auto-save-files)

collects/framework/private/sig.ss

@@ -384,7 +384,8 @@
      install-recent-items
      add-to-recent
      set-recent-position
-     set-recent-items-frame-superclass))
+     set-recent-items-frame-superclass
+     size-recently-opened-files))
   (define-signature framework:handler^
     ((open framework:handler-class^)
      (open framework:handler-fun^)))