ASIWebPageRequests now pass on most delegate calls to their parent's delegate

Improve iPad ASIWebPageRequest sample to show the resources being downloaded

@@ -1636,7 +1636,7 @@ static NSOperationQueue *sharedQueue = nil;
 {
 	if ([*target respondsToSelector:selector]) {
 		NSMethodSignature *signature = nil;
-		signature = [[*target class] instanceMethodSignatureForSelector:selector];
+		signature = [*target methodSignatureForSelector:selector];
 		NSInvocation *invocation = [[NSInvocation invocationWithMethodSignature:signature] retain];
 		[invocation setSelector:selector];
 		

@@ -43,7 +43,6 @@ static NSMutableArray *requestsUsingXMLParser = nil;
 {
 }
 
-
 - (void)requestFinished
 {
 	complete = NO;
@@ -114,6 +113,9 @@ static NSMutableArray *requestsUsingXMLParser = nil;
 		[externalResourceRequest setParentRequest:self];
 		[externalResourceRequest setReplaceURLsWithDataURLs:[self replaceURLsWithDataURLs]];
 		[externalResourceRequest setShouldResetDownloadProgress:NO];
+		[externalResourceRequest setDelegate:self];
+		[externalResourceRequest setUploadProgressDelegate:self];
+		[externalResourceRequest setDownloadProgressDelegate:self];
 		if ([self downloadDestinationPath]) {
 			[externalResourceRequest setDownloadDestinationPath:[self cachePathForRequest:externalResourceRequest]];
 		}
@@ -179,42 +181,18 @@ static NSMutableArray *requestsUsingXMLParser = nil;
 		[externalResourceRequest setParentRequest:self];
 		[externalResourceRequest setReplaceURLsWithDataURLs:[self replaceURLsWithDataURLs]];
 		[externalResourceRequest setShouldResetDownloadProgress:NO];
+		[externalResourceRequest setDelegate:self];
+		[externalResourceRequest setUploadProgressDelegate:self];
+		[externalResourceRequest setDownloadProgressDelegate:self];
 		if ([self downloadDestinationPath]) {
 			[externalResourceRequest setDownloadDestinationPath:[self cachePathForRequest:externalResourceRequest]];
 		}
 		[[self externalResourceQueue] addOperation:externalResourceRequest];
 		[externalResourceRequest setShowAccurateProgress:YES];
-		[self incrementDownloadSizeBy:1];
 	}
 	[[self externalResourceQueue] go];
 }
 
-- (void)updateDownloadProgress
-{
-	if ([self parentRequest]) {
-		[[self parentRequest] updateDownloadProgress];
-		return;
-	}
-	[super updateDownloadProgress];
-}
-
-- (void)setContentLength:(unsigned long long)newContentLength
-{
-	if ([self parentRequest]) {
-		[[self parentRequest] setContentLength:[[self parentRequest] contentLength]+newContentLength-contentLength];
-	}
-	[super setContentLength:newContentLength];
-}
-- (void)setTotalBytesRead:(unsigned long long)bytes
-{
-	totalBytesRead = bytes;
-	if ([self parentRequest]) {
-		[[self parentRequest] setTotalBytesRead:[[self parentRequest] totalBytesRead]+totalBytesRead-lastBytesRead];
-		lastBytesRead = totalBytesRead;
-		return;
-	}
-}
-
 - (void)externalResourceFetchSucceeded:(ASIHTTPRequest *)externalResourceRequest
 {
 	NSString *originalPath = [[externalResourceRequest userInfo] objectForKey:@"Path"];
@@ -439,6 +417,52 @@ static NSMutableArray *requestsUsingXMLParser = nil;
 	xmlXPathFreeContext(xpathCtx);
 }
 
+- (BOOL)respondsToSelector:(SEL)selector
+{
+	if ([self parentRequest]) {
+		return [[self parentRequest] respondsToSelector:selector];
+	}
+	//Ok, now check for selectors we want to pass on to the delegate
+	if (selector == @selector(requestStarted:) || selector == @selector(request:didReceiveResponseHeaders:) || selector == @selector(request:willRedirectToURL:) || selector == @selector(requestFinished:) || selector == @selector(requestFailed:) || selector == @selector(request:didReceiveData:) || selector == @selector(authenticationNeededForRequest:) || selector == @selector(proxyAuthenticationNeededForRequest:)) {
+		return [delegate respondsToSelector:selector];
+	} else if (selector == @selector(request:didReceiveBytes:) || selector == @selector(request:incrementDownloadSizeBy:)) {
+		return [downloadProgressDelegate respondsToSelector:selector];
+	} else if (selector == @selector(request:didSendBytes:)  || selector == @selector(request:incrementUploadSizeBy:)) {
+		return [uploadProgressDelegate respondsToSelector:selector];
+	}
+	return [super respondsToSelector:selector];
+}
+
+- (NSMethodSignature *)methodSignatureForSelector:(SEL)selector
+{
+	if ([self parentRequest]) {
+		return [[self parentRequest] methodSignatureForSelector:selector];
+	}
+	if (selector == @selector(requestStarted:) || selector == @selector(request:didReceiveResponseHeaders:) || selector == @selector(request:willRedirectToURL:) || selector == @selector(requestFinished:) || selector == @selector(requestFailed:) || selector == @selector(request:didReceiveData:) || selector == @selector(authenticationNeededForRequest:) || selector == @selector(proxyAuthenticationNeededForRequest:)) {
+		return [(id)delegate methodSignatureForSelector:selector];
+	} else if (selector == @selector(request:didReceiveBytes:) || selector == @selector(request:incrementDownloadSizeBy:)) {
+		return [(id)downloadProgressDelegate methodSignatureForSelector:selector];
+	} else if (selector == @selector(request:didSendBytes:)  || selector == @selector(request:incrementUploadSizeBy:)) {
+		return [(id)uploadProgressDelegate methodSignatureForSelector:selector];
+	}
+	return nil;
+}
+
+- (void)forwardInvocation:(NSInvocation *)anInvocation
+{
+	if ([self parentRequest]) {
+		return [[self parentRequest] forwardInvocation:anInvocation];
+	}
+	SEL selector = [anInvocation selector];
+	if (selector == @selector(requestStarted:) || selector == @selector(request:didReceiveResponseHeaders:) || selector == @selector(request:willRedirectToURL:) || selector == @selector(requestFinished:) || selector == @selector(requestFailed:) || selector == @selector(request:didReceiveData:) || selector == @selector(authenticationNeededForRequest:) || selector == @selector(proxyAuthenticationNeededForRequest:)) {
+		[anInvocation invokeWithTarget:delegate];
+	} else if (selector == @selector(request:didReceiveBytes:) || selector == @selector(request:incrementDownloadSizeBy:)) {
+		[anInvocation invokeWithTarget:downloadProgressDelegate];
+	} else if (selector == @selector(request:didSendBytes:)  || selector == @selector(request:incrementUploadSizeBy:)) {
+		[anInvocation invokeWithTarget:uploadProgressDelegate];
+	}
+}
+
 + (NSArray *)CSSURLsFromString:(NSString *)string
 {
 	NSMutableArray *urls = [NSMutableArray array];
@@ -496,6 +520,7 @@ static NSMutableArray *requestsUsingXMLParser = nil;
 	}
 }
 
+
 @synthesize externalResourceQueue;
 @synthesize resourceList;
 @synthesize parentRequest;

+//
+//  RequestProgressCell.h
+//  iPhone
+//
+//  Created by Ben Copsey on 03/10/2010.
+//  Copyright 2010 All-Seeing Interactive. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+
+@interface RequestProgressCell : UITableViewCell {
+	UIProgressView *progressView;
+}
++ (id)cell;
+
+@property (assign, nonatomic) UIProgressView *progressView;
+@end

+//
+//  RequestProgressCell.m
+//  iPhone
+//
+//  Created by Ben Copsey on 03/10/2010.
+//  Copyright 2010 All-Seeing Interactive. All rights reserved.
+//
+
+#import "RequestProgressCell.h"
+
+
+@implementation RequestProgressCell
+
++ (id)cell
+{
+	RequestProgressCell *cell = [[[RequestProgressCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:@"RequestProgressCell"] autorelease];
+	[[cell textLabel] setTextAlignment:UITextAlignmentLeft];
+	[[cell textLabel] setFont:[UIFont systemFontOfSize:12]];
+	[cell setProgressView:[[[UIProgressView alloc] initWithFrame:CGRectMake(0,0,100,20)] autorelease]];
+	[cell setAccessoryView:[cell progressView]];
+	return cell;
+}
+
+- (void)layoutSubviews
+{
+	[super layoutSubviews];
+	CGRect f = [[self accessoryView] frame];
+	[[self accessoryView] setFrame:CGRectMake(f.origin.x, f.origin.y+6, f.size.width, f.size.height)];
+	
+}
+
+@synthesize progressView;
+@end

@@ -17,8 +17,10 @@
 	UITextView *responseField;
 	UISwitch *replaceURLsSwitch;
 	ASIWebPageRequest *request;
+	NSMutableArray *requestsInProgress;
 }
 - (void)fetchURL:(NSURL *)url;
 
 @property (retain, nonatomic) ASIWebPageRequest *request;
+@property (retain, nonatomic) NSMutableArray *requestsInProgress;
 @end

@@ -11,12 +11,13 @@
 #import "ASIWebPageRequest.h"
 #import "ASIDownloadCache.h"
 #import "ToggleCell.h"
+#import "RequestProgressCell.h"
+
 @implementation WebPageViewController
 
 - (void)fetchWebPage:(id)sender
 {
 	[self fetchURL:[NSURL URLWithString:[urlField text]]];
-	
 }
 
 - (void)clearCache:(id)sender
@@ -27,17 +28,23 @@
 
 - (void)fetchURL:(NSURL *)url
 {
+	[urlField resignFirstResponder];
+
+	[self setRequestsInProgress:[NSMutableArray array]];
+	[[self tableView] reloadSections:[NSIndexSet indexSetWithIndex:2] withRowAnimation:UITableViewRowAnimationBottom];
+
 	// This allows our ASIDownloadCache to masquerade as as NSURLCache
 	// It allows the webView to load the content we downloaded when replaceURLsWithDataURLs is NO 
 	[NSURLCache setSharedURLCache:[ASIDownloadCache sharedCache]];
-	
+
 	[request setDelegate:nil];
 	[request cancel];
 	[self setRequest:[ASIWebPageRequest requestWithURL:url]];
-	
+
 	[request setDidFailSelector:@selector(webPageFetchFailed:)];
 	[request setDidFinishSelector:@selector(webPageFetchSucceeded:)];
 	[request setDelegate:self];
+	[request setDownloadProgressDelegate:self];
 	[request setShowAccurateProgress:NO];
 	[request setReplaceURLsWithDataURLs:[replaceURLsSwitch isOn]];
 	
@@ -68,6 +75,7 @@
 	[urlField setText:[[theRequest url] absoluteString]];
 }
 
+// We'll take over the page load when the user clicks on a link
 - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)theRequest navigationType:(UIWebViewNavigationType)navigationType
 {
 	if (navigationType == UIWebViewNavigationTypeLinkClicked) {
@@ -77,6 +85,32 @@
 	return YES;
 }
 
+
+// At time of writing ASIWebPageRequests do not support automatic progress tracking across all requests needed for a page
+// The code below shows one approach you could use for tracking progress - it creates a new row with a progress indicator for each resource request
+// However, you could use the same approach and keep track of an overal total to show progress
+- (void)requestStarted:(ASIWebPageRequest *)theRequest
+{
+	[[self requestsInProgress] addObject:theRequest];
+	[[self tableView] beginUpdates];
+	[[self tableView] insertRowsAtIndexPaths:[NSArray arrayWithObject:[NSIndexPath indexPathForRow:[[self requestsInProgress] count]-1 inSection:2]] withRowAnimation:UITableViewRowAnimationBottom];
+	[[self tableView] endUpdates];
+}
+
+- (void)request:(ASIHTTPRequest *)theRequest didReceiveBytes:(long long)newLength
+{
+	NSInteger requestNumber = [[self requestsInProgress] indexOfObject:theRequest];
+	if (requestNumber != NSNotFound) {
+		RequestProgressCell *cell = (RequestProgressCell *)[[self tableView] cellForRowAtIndexPath:[NSIndexPath indexPathForRow:requestNumber inSection:2]];
+		[[cell progressView] setProgress:[theRequest totalBytesRead]/([theRequest contentLength]+[theRequest partialDownloadSize])];
+	}
+}
+
+- (void)request:(ASIHTTPRequest *)theRequest incrementDownloadSizeBy:(long long)newLength
+{
+	[self request:theRequest didReceiveBytes:0];
+}
+
 /*
  Most of the code below here relates to the table view, and isn't that interesting
  */
@@ -147,6 +181,18 @@ static NSString *intro = @"ASIWebPageRequest lets you download complete webpages
 			replaceURLsSwitch = [(ToggleCell *)cell toggle];
 		}
 	} else if ([indexPath section] == 2) {
+
+		cell = [tableView dequeueReusableCellWithIdentifier:@"RequestProgressCell"];
+		if (!cell) {
+			cell = [RequestProgressCell cell];
+		}
+		ASIHTTPRequest *theRequest = [[self requestsInProgress] objectAtIndex:[indexPath row]];
+		[[cell textLabel] setText:[[theRequest url] absoluteString]];
+		if ([theRequest contentLength] > 0) {
+			[[(RequestProgressCell *)cell progressView] setProgress:[theRequest totalBytesRead]/([theRequest contentLength]+[theRequest partialDownloadSize])];
+		}
+
+	} else if ([indexPath section] == 3) {
 		
 		cell = [tableView dequeueReusableCellWithIdentifier:@"Response"];
 		if (!cell) {
@@ -156,7 +202,6 @@ static NSString *intro = @"ASIWebPageRequest lets you download complete webpages
 		}	
 		[responseField setFrame:CGRectMake(5,5,tableWidth-tablePadding,180)];
 		
-		
 	}
 	[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
 	return cell;
@@ -204,6 +249,8 @@ static NSString *intro = @"ASIWebPageRequest lets you download complete webpages
 {
 	if (section == 1) {
 		return 2;
+	} else if (section == 2) {
+		return [requestsInProgress count];
 	}
 	return 1;
 }
@@ -226,8 +273,10 @@ static NSString *intro = @"ASIWebPageRequest lets you download complete webpages
 		} else {
 			return 50;
 		}
-	} else {
+	} else if ([indexPath section] == 3) {
 		return 200;
+	} else {
+		return 34;
 	}
 }
 
@@ -238,8 +287,9 @@ static NSString *intro = @"ASIWebPageRequest lets you download complete webpages
 
 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 {
-	return 3;
+	return 4;
 }
 
 @synthesize request;
+@synthesize requestsInProgress;
 @end