Difference between revisions of "Snippets"

Revision as of 13:47, 5 September 2005

Objective-C and OOP Concepts

Foundation Kit

NSArray

@@ Line 1: / Line 1: @@
-== Testing ''chars'' entered by users in ''NSTextField'' ==
+== Objective-C and OOP Concepts ==
-When the contents of a NSTextField are changed by the user, it is possible to check whether or not to accept the changes.
-. Subclass NSTextField
-. In your subclass implement the
-         - (BOOL) textView: (NSTextView*) textView
-         shouldChangeTextInRange: (NSRange) range
-         replacementString: (NSString*) replacementString
-method.
-. Within this method you can access to the ''replacementString'' as an NSString, or as ''char'' with the following line:
+== Foundation Kit ==
-         char c = *([replacementString cString] + 0);
+* [[NSArray]]
-. You should return YES or NO depending on whether you accept the replacement string.
-== Limiting text input length in ''NSTextField'' ==
+== Application Kit ==
-(based on Alexander Malmberg's snippet)
+* [[NSDocument]]
+* [[NSTableView]]
-. Subclass NSTextField
+* [[NSTextField]]
+* [[NSView]]
-. In your subclass implement the
-         - (BOOL) textView: (NSTextView*) textView
-         shouldChangeTextInRange: (NSRange) range
-         replacementString: (NSString*) replacementString
-method.
-. Also create an instance variable setting method:
-          - (void) setMaxLength: (int) ml
-          {
-             maxLength = ml;
-          }
-. Then fill your implementation of textView:shouldChangeTextInRange:replacementString: with the following code:
-          int newLength;
-          /* The exact change isn't known. Disallow the change to be safe. */
-           if (range.location == NSNotFound)
-                return NO;
-           newLength=[[textView textStorage] length]+[replacementString length]-range.length;
-           if (newLength>maxLength)
-                return YES; //allowing
-           else
-                return NO; // not allowing

Difference between revisions of "Snippets"

Revision as of 13:47, 5 September 2005

Objective-C and OOP Concepts

Foundation Kit

Application Kit

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