Difference between revisions of "Snippets"

Latest revision as of 09:54, 4 January 2007

This page is being or has been relocated.
The contents are now (or should soon be) located at Category:Snippets.

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-== Testing ''chars'' entered by users in ''NSTextField'' ==
+{{category redirect|Snippets}}
-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:
-         char c = *([replacementString cString] + 0);
-. You should return YES or NO depending on whether you accept the replacement string.
-== Limiting text input length in ''NSTextField'' ==
-(based on Alexander Malmberg's snippet)
-. Subclass NSTextField
-. 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"

Latest revision as of 09:54, 4 January 2007

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