Implement menu and user interface item validation for NSTextView. The

list of validated actions is incomplete but at least includes all
items from a standard Edit menu.


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@29012 72102866-910b-0410-8b05-ffd578937521

ChangeLog

@@ -1,5 +1,11 @@
 2009-11-14  Wolfgang Lux  <wolfgang.lux@gmail.com>
 
+	* Source/NSTextView_actions.m (-validateMenuItem:,
+	-validateUserIntefaceItem:): Implement menu and user interface
+	item validation for NSTextView. The list of validated actions is
+	incomplete but at least includes all items from a standard Edit
+	menu.
+
 	* Source/NSCell.m(-_setupTextWithFrame:inView:editor:delegate:range:,
 	-_updateFieldEditor):
 	* Source/NSActionCell.m (-setObjectValue:, -setStringValue:):

Source/NSTextView_actions.m

@@ -51,6 +51,8 @@
 #include "AppKit/NSAttributedString.h"
 #include "AppKit/NSGraphics.h"
 #include "AppKit/NSLayoutManager.h"
+#include "AppKit/NSMenuItem.h"
+#include "AppKit/NSPasteboard.h"
 #include "AppKit/NSScrollView.h"
 #include "AppKit/NSTextStorage.h"
 #include "AppKit/NSTextView.h"
@@ -1512,4 +1514,51 @@ and layout is left-to-right */
   // FIXME
 }
 
+- (BOOL) validateMenuItem: (NSMenuItem *)item
+{
+  return [self validateUserInterfaceItem: item];
+}
+
+- (BOOL) validateUserInterfaceItem: (id<NSValidatedUserInterfaceItem>)item
+{
+  SEL action = [item action];
+
+  // FIXME The list of validated actions below is far from complete
+
+  if (sel_eq(action, @selector(cut:)) || sel_eq(action, @selector(delete:)))
+    return [self isEditable] && [self selectedRange].length > 0;
+
+  if (sel_eq(action, @selector(copy:)))
+    return [self selectedRange].length > 0;
+
+  if (sel_eq(action, @selector(paste:))
+   || sel_eq(action, @selector(pasteAsPlainText:))
+      || sel_eq(action, @selector(pasteAsRichText:)))
+    {
+      if ([self isEditable])
+	{
+	  NSArray *types;
+	  NSString *available;
+
+	  if (sel_eq(action, @selector(paste:)))
+	    types = [self readablePasteboardTypes];
+	  else if (sel_eq(action, @selector(pasteAsPlainText:)))
+	    types = [NSArray arrayWithObject: NSStringPboardType];
+	  else /*if (sel_eq(action, @selector(pasteAsRichText:)))*/
+	    types = [NSArray arrayWithObject: NSRTFPboardType];
+
+	  available = [[NSPasteboard generalPasteboard]
+			availableTypeFromArray: types];
+	  return available != nil;
+	}
+      else
+	return NO;
+    }
+
+  if (sel_eq(action, @selector(selectAll:))
+   || sel_eq(action, @selector(centerSelectionInVisibleArea:)))
+    return [self isSelectable];
+
+  return YES;
+}
 @end