Feature: [feature-requests:#987]. Cocoa user interface validation.

2 files changed, 23 insertions, 1 deletions

diff --git a/cocoa/ScintillaView.h b/cocoa/ScintillaView.h
index 996501788..356c34adb 100644
--- a/cocoa/ScintillaView.h
+++ b/cocoa/ScintillaView.h
@@ -48,7 +48,7 @@ extern NSString *SCIUpdateUINotification;
  * InnerView is the Cocoa interface to the Scintilla backend. It handles text input and
  * provides a canvas for painting the output.
  */
-@interface InnerView : NSView <NSTextInputClient>
+@interface InnerView : NSView <NSTextInputClient, NSUserInterfaceValidations>
 {
 @private
   ScintillaView* mOwner;
diff --git a/cocoa/ScintillaView.mm b/cocoa/ScintillaView.mm
index a23a4b8b0..7f6b4991e 100644
--- a/cocoa/ScintillaView.mm
+++ b/cocoa/ScintillaView.mm
@@ -787,6 +787,28 @@ static NSCursor *cursorFromEnum(Window::Cursor cursor)
   return mOwner.backend->CanRedo();
 }
 
+- (BOOL) validateUserInterfaceItem: (id <NSValidatedUserInterfaceItem>) anItem
+{
+  SEL action = [anItem action];
+  if (action==@selector(undo:)) {
+    return [self canUndo];
+  }
+  else if (action==@selector(redo:)) {
+    return [self canRedo];
+  }
+  else if (action==@selector(cut:) || action==@selector(copy:) || action==@selector(clear:)) {
+    return mOwner.backend->HasSelection();
+  }
+  else if (action==@selector(paste:)) {
+    return mOwner.backend->CanPaste();
+  }
+  return YES;
+}
+
+- (void) clear: (id) sender
+{
+  [self deleteBackward:sender];
+}
 
 - (BOOL) isEditable
 {