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Mac Forum / Programming / Mac Programming / November 2006How to create a clickable link
Hi, I'm trying to have a text label (i.e. NSTextField) display an URL that should be clickable. I found several examples and explanations on how to do this for a textview. I even tried to override the field editor for my textfield, but it seems the field editor's text storage has no relation whatsoever to the textfield's contents (so I couldn't set text attributes, which I want). (Is there a way to fix that? That'd be the easiest thing.) Is there any way to set attributes for part of a text field? If not, what's the cleanest best-practice way of adding a mouse listener and maybe an underlined font to a textfield (so I could separate my label into two labels, one of which would be clickable; ugly but better than nothing)? Can I use delegation? Or do I have to subclass the field, or the cell? Another question: what's the typical way of having draggable icons (such as the icon in a browser's location bar)? Do people just use a tiny NSImageView? Again, this doesn't quite fit into a textfield. Smells like lots of custom coding again... > Is there any way to set attributes for part of a text field Did you set allowsEditingTextAttributes to YES? m.  Signaturematt neuburg, phd = matt@tidbits.com, http://www.tidbits.com/matt/ Tiger - http://www.takecontrolbooks.com/tiger-customizing.html AppleScript - http://www.amazon.com/gp/product/0596102119 Read TidBITS! It's free and smart. http://www.tidbits.com > > Is there any way to set attributes for part of a text field > > Did you set allowsEditingTextAttributes to YES? m. Well, but what method do I use then? Textfields don't have addAttributes:range: like a text storage, and as I said, even a dedicated (non-shared) field editor (textview) doesn't seem to *have* the field's text storage (the field editor's text storage is empty, while the textfield displays its content just fine...). > > > Is there any way to set attributes for part of a text field > > [quoted text clipped - 5 lines] > the field's text storage (the field editor's text storage is empty, > while the textfield displays its content just fine...). An NSTextField is an NSControl, so it has a setAttributedString: method. I'm not sure what you mean about the field editor's text storage; perhaps you should show your code. m. Signaturematt neuburg, phd = matt@tidbits.com, http://www.tidbits.com/matt/ Tiger - http://www.takecontrolbooks.com/tiger-customizing.html AppleScript - http://www.amazon.com/gp/product/0596102119 Read TidBITS! It's free and smart. http://www.tidbits.com > An NSTextField is an NSControl, so it has a setAttributedString: method. > I'm not sure what you mean about the field editor's text storage; > perhaps you should show your code. m. Thanks a lot, that works like a charm! The textfield even interprets my LinkAttribute correctly. The only thing funny is that when I click the link, the textfield's font changes to a smaller font... Don't know why that's happening... > > An NSTextField is an NSControl, so it has a setAttributedString: method. > > I'm not sure what you mean about the field editor's text storage; [quoted text clipped - 5 lines] > thing funny is that when I click the link, the textfield's font changes > to a smaller font... Don't know why that's happening... You still are not showing any code so it's impossible to guess. m. Signaturematt neuburg, phd = matt@tidbits.com, http://www.tidbits.com/matt/ Tiger - http://www.takecontrolbooks.com/tiger-customizing.html AppleScript - http://www.amazon.com/gp/product/0596102119 Read TidBITS! It's free and smart. http://www.tidbits.com > > The textfield even interprets my LinkAttribute correctly. The only > > thing funny is that when I click the link, the textfield's font changes > > to a smaller font... Don't know why that's happening... > > You still are not showing any code so it's impossible to guess. m. Well, the code is boring, and doesn't really do much... That's why I'm wondering at the behavior. [textfield setAllowsEditingTextAttributes:YES]; NSString *url = @"http://someurl/"; NSString *s = [NSString stringWithFormat:@"Look at: %@", url]; NSMutableAttributedString *str = [[[NSMutableAttributedString alloc] initWithString:s] autorelease]; NSRange urlRange = [s rangeOfString:@"http://"]; urlRange.length = [s length] - urlRange.location; NSDictionary *attrs = [NSDictionary dictionaryWithObjectsAndKeys: [NSURL URLWithString:url], NSLinkAttributeName, [NSNumber numberWithInt:NSSingleUnderlineStyle],NSUnderlineStyleAttributeName, [NSColor blueColor], NSForegroundColorAttributeName, NULL]; [str beginEditing]; [str addAttributes:attrs range:urlRange]; [str endEditing]; [textfield setAttributedStringValue:str]; > > > The textfield even interprets my LinkAttribute correctly. The only > > > thing funny is that when I click the link, the textfield's font changes [quoted text clipped - 21 lines] > [str endEditing]; > [textfield setAttributedStringValue:str]; Ah, I see. The problem is that this is an editable text field but at the time you are issuing this command it is not actually being edited. (Try it. You will see that if you are actually editing the field at the time you issue this command, it starts out with the smaller font.) It is not changing because you are clicking the link; it is changing because you are starting to edit the field. (Try it: click in "Look at", not at the link, and you will see the font become smaller.) The reason is that you are not supplying any font and size information, so the font and size for the text field and the field editor are in conflict. Try this: NSMutableAttributedString *str = [[[NSMutableAttributedString alloc] initWithString:s attributes: [NSDictionary dictionaryWithObject: [NSFont fontWithName:@"Lucida Grande" size:13] forKey: NSFontAttributeName]] autorelease]; Problem solved. m. Signaturematt neuburg, phd = matt@tidbits.com, http://www.tidbits.com/matt/ Tiger - http://www.takecontrolbooks.com/tiger-customizing.html AppleScript - http://www.amazon.com/gp/product/0596102119 Read TidBITS! It's free and smart. http://www.tidbits.com > The reason is that you are not supplying any font and size information, > so the font and size for the text field and the field editor are in > conflict. Try this: Oh, I didn't know the field editor installs its own font attributes... Thanks a lot, Matt! (I have another related question though: because I also want my textfield to be selectable, when the user clicks in it, the cursor is displayed (non-blinking). I think this shouldn't happen, but I don't know how to turn it off.) > > The textfield even interprets my LinkAttribute correctly. The only > > thing funny is that when I click the link, the textfield's font changes > > to a smaller font... Don't know why that's happening... > > You still are not showing any code so it's impossible to guess. m. Well, the code is boring, and doesn't really do much... That's why I'm wondering at the behavior. [textfield setAllowsEditingTextAttributes:YES]; NSString *url = @"http://someurl/"; NSString *s = [NSString stringWithFormat:@"Look at: %@", url]; NSMutableAttributedString *str = [[[NSMutableAttributedString alloc] initWithString:s] autorelease]; NSRange urlRange = [s rangeOfString:@"http://"]; urlRange.length = [s length] - urlRange.location; NSDictionary *attrs = [NSDictionary dictionaryWithObjectsAndKeys: [NSURL URLWithString:url], NSLinkAttributeName, [NSNumber numberWithInt:NSSingleUnderlineStyle],NSUnderlineStyleAttributeName, [NSColor blueColor], NSForegroundColorAttributeName, NULL]; [str beginEditing]; [str addAttributes:attrs range:urlRange]; [str endEditing]; [textfield setAttributedStringValue:str]; |
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