cocoa web browser

Subject: cocoa web browser
From: Matthew Smith <email@hidden>
Date: Wed, 14 Aug 2002 11:57:05 +1000

I'm attempting to make a simple html browser using the following:

a NSURLHandle to download the data
a NSTextView to display the HTML

To know when an image is loaded I register for HTMLDocumentChangedNotification, and on the notification I wish to refresh the NSTextView. To do this I am calling [myTextView setNeedsDisplay:YES]; only this causes the following message in stdout and no refresh:

2002-08-14 11:06:16.338 WeBrowser[896] drawWithOuterFrame:contentFrame:clipping: called on cell 0x1570b60 which has not yet measured! thread Thread 0x800013b8

If I comment out the setNeedsDisplay line and resize the window after the page first loads (manually) I get the webpage in it's full glory, but this is obviously not the best solution...

Any idea what is causing the error?? Otherwise, any ideas how to refresh the NSTextView effiecently? (I've tried things like programmatically altering the window frame then returning it to the original size (slow) and passing the html data back to the NSTextView (even slower))

I'm having difficulty posting the code up on the internet so I've added it to the end of the email...

Thanks for any help,

Matt Smith


#import <Cocoa/Cocoa.h>

@interface AppController : NSObject { IBOutlet id myWindow; IBOutlet id textThingy; // The textview IBOutlet id URLField; // textfield containing url NSURL * myURL; NSURLHandle * myHandle; NSData * responseData; NSMutableAttributedString * responseString; } - (IBAction)go:(id)sender; - (BOOL)textView: (NSTextView *)textView clickedOnLink: (id)link atIndex: (unsigned)charIndex; - (void)HTMLChanged:(NSNotification *)notification; @end

@implementation AppController

-(void)awakeFromNib { [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(HTMLChanged:) name:@"HTMLDocumentChangedNotification" object:nil]; [URLField setStringValue:@"http://www.apple.com/";]; [self go:self]; }

- (IBAction)go:(id)sender
{
    if (myURL)
        [myURL release];
    myURL = [NSURL URLWithString:[URLField stringValue]];
    if (myHandle)
        [myHandle release];
    myHandle = [myURL URLHandleUsingCache:YES];

responseData = [[myHandle resourceData] autorelease]; responseString = [[[NSMutableAttributedString alloc] initWithHTML:responseData baseURL:myURL documentAttributes:nil] autorelease]; [[textThingy textStorage] setAttributedString:responseString]; }

- (BOOL)textView: (NSTextView *)textView clickedOnLink: (id)link atIndex: (unsigned)charIndex { myURL = [NSURL URLWithString: (NSString *) link relativeToURL:myURL];

    [URLField setStringValue:[myURL absoluteString]];

    myHandle = [myURL URLHandleUsingCache:YES];

- (void)HTMLChanged:(NSNotification *)notification
{
    [textThingy setNeedsDisplay:YES];
}

@end
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