Re: Changing font stuff in NSTextView + Undo
Re: Changing font stuff in NSTextView + Undo
- Subject: Re: Changing font stuff in NSTextView + Undo
- From: Bernie Zenis <email@hidden>
- Date: Sat, 31 Jan 2004 14:50:44 -0500
On Friday, January 30, 2004, at 07:51 PM, Douglas Davidson wrote:
Manipulate the text storage directly. Iterate over it by effective
ranges for NSFontAttributeName, making your changes. Be sure to call
-[NSTextView shouldChangeTextInRange:replacementString:] first, then
-[NSTextStorage beginEditing], then make your changes, then call
-[NSTextStorage endEditing] and -[NSTextView didChangeText].
The basics of what I have so far is the following pseudo-code:
range = [NSTextView rangeForUserCharacterAttributeChange];
if (range.location == NSNotFound) return;
if (![NSTextView shouldChangeTextInRange:range replacementString:nil])
return;
if (![NSTextView isRichText]) {
oldFont = [NSTextView font];
newFont = MyConvertFont(oldFont);
[NSTextView setFont:newFont];
} else if (range.length == 0) {
oldAttrs = [NSTextView typingAttributes];
oldFont = [oldAttrs objectForKey:NSFontAttributeName];
newFont = MyConvertFont(oldFont);
newAttrs = [NSMutableDictionary dictionaryWithDictionary:oldAttrs];
[newAttrs setObject:newFont forKey:NSFontAttributeName];
[NSTextView setTypingAttributes:newAttrs];
} else {
attrString = [NSTextView attributedSubstringFromRange:range];
while (not all attrString scanned) {
oldFont = [attrString attribute:NSFontAttributeName...];
newFont = MyConvertFont(oldFont);
[NSTextView setFont:newFont range:...];
}
}
[NSTextView didChangeText];
[[NSTextView undoManager] setActionName:@"Set Font"];
If I understand you and Apple's docs correctly, manipulating the
NSTextStorage directly would be more efficient. Let me guess, the
non-rich text and the insertion point parts are OK; but, the selection
part is not good because each time I call [NSTextView setFont:newFont
range:...] the NSTextView calls [NSTextStorage beginEditing] and
[NSTextStorage endEditing]? And it would be better for me to make all
the changes to the NSTextStorage at once?
Thank you,
Bernie
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