add increase/decrease font size menu items (ala browsers)

collects/drracket/private/frame.rkt

@@ -3,6 +3,8 @@
            racket/match
            racket/class
            racket/string
+           racket/file
+           racket/math
            "drsig.rkt"
            mred
            framework
@@ -10,7 +12,6 @@
            net/head
            setup/plt-installer
            help/bug-report
-           racket/file
            setup/unpack)
   
   (import [prefix drracket:unit: drracket:unit^]
@@ -630,6 +631,13 @@
         [(and (number? x) (string? y)) #t]
         [(and (string? x) (number? y)) #f]))
     (define sorted-items (sort items cmp))
+    
+    (define (different-slots? item-key next-item-key)
+      (or (not (= (quotient item-key 100)
+                  (quotient next-item-key 100)))
+          (not (= (sgn item-key)
+                  (sgn next-item-key)))))
+    
     (for ([item (in-list sorted-items)]
           [next-item (in-list (append (cdr sorted-items) (list #f)))])
       (define item-key (get-key item))
@@ -637,7 +645,7 @@
       (define add-sep?
         (cond
           [(and (number? item-key) (number? next-item-key))
-           (not (= (quotient item-key 100) (quotient next-item-key 100)))]
+           (different-slots? item-key next-item-key)]
           [(or (and (string? item-key) (string? next-item-key))
                (not next-item-key))
            #f]

collects/drracket/private/unit.rkt

@@ -3403,8 +3403,6 @@ module browser threading seems wrong.
         (set-show-menu-sort-key logger-menu-item 205)
         
         
-        
-          
         (set! show-line-numbers-menu-item
               (new menu:can-restore-menu-item%
                    [label (if (show-line-numbers?)
@@ -3417,6 +3415,32 @@ module browser threading seems wrong.
                                (show-line-numbers! (not value)))]))
         (set-show-menu-sort-key show-line-numbers-menu-item 302)
         
+        (let ()
+          (define (font-adjust adj label key shortcut)
+            (define (adj-font _1 _2)
+              (preferences:set
+               'framework:standard-style-list:font-size
+               (adj (preferences:get
+                     'framework:standard-style-list:font-size))))
+            (define (on-demand item)
+              (define lab 
+                (format 
+                 label 
+                 (adj 
+                  (preferences:get
+                   'framework:standard-style-list:font-size))))
+              (send item set-label lab))
+            (define item
+             (new menu:can-restore-menu-item%
+                  (shortcut shortcut)
+                  (label "")
+                  (parent (get-show-menu))
+                  (callback adj-font)
+                  (demand-callback on-demand)))
+            (set-show-menu-sort-key item key))
+          (font-adjust add1 (string-constant increase-font-size) -2 #\=)
+          (font-adjust sub1 (string-constant decrease-font-size) -3 #\-))
+        
         (let ([split
                (new menu:can-restore-menu-item%
                     (shortcut (if (eq? (system-type) 'macosx) #f #\m))

collects/string-constants/private/english-string-constants.rkt

@@ -577,6 +577,10 @@ please adhere to these guidelines:
  (example-text "Example Text:")
  (only-warn-once "Only warn once when definitions and interactions are not synchronized")
  
+ ; font size menu items in the 'view' menu; the ~a is filled with a number (font size)
+ (increase-font-size "Increase Font Size (To ~a)")
+ (decrease-font-size "Decrease Font Size (To ~a)")
+  
  ; warning message when lockfile is around
  (waiting-for-pref-lock "Waiting for the preferences lockfile...")
  (pref-lock-not-gone