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Search Crawler is a basic Web crawler for searching the Web, and it illustrates the fundamental structure of crawler-based applications. With Search Crawler, you can enter search criteria and then search the Web in real time, URL by URL, looking for matches to the criteria. Search Crawler s interface, as shown in Figure 6-1, has three prominent sections, which we will refer to as Search, Stats, and Matches. The Search section at the top of the window has controls for entering search criteria, including the start URL for the search, the maximum number of URLs to crawl, and the search string. The search criteria can be additionally tweaked by choosing to limit the search to the site of the beginning URL and by selecting the Case Sensitive check box for the search string. The Stats section, located in the middle of the window, has controls showing the current status of crawling when searching is underway. This section also has a progress bar to indicate the progress toward completing the search. The Matches section at the bottom of the window has a table listing all the matches found by a search. These are the URLs of the Web pages that contain the search string.

mySlider = [[UISlider alloc] initWithFrame:CGRectMake(90,0,210,44)]; [myTools addSubview:mySlider];

Now that the UISlider is a subview of the toolbar at the bottom, you won t have to worry about its positioning. It will always appear in the toolbar next to the Done button. Figure D.6 shows the updated interface with these improvements. The application is starting to look much more complete. But one problem remains: when the user rotates the device, the interface stays in portrait mode. You need to tell the interface to rotate as well as update the frames of the main views.

Figure 6-1

As we mentioned earlier, adding support for all orientations is necessary for iPad applications. To do this, you must implement the shouldAutorotateToInterfaceOrientation

Activation and deactivation notifications are sent to your application delegate with these two calls:

SearchCrawler has a main( ) method, so on execution it will be invoked first. The main( ) method instantiates a new SearchCrawler object and then calls its show( ) method, which causes it to be displayed. The SearchCrawler class is shown here and is examined in detail in the following sections. Notice that it extends JFrame:

method on all your views. This method should respond to the interface changes and return YES. To update the application, open collageViewController.m and add the following code:

- (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation { #if __IPHONE_OS_VERSION_MAX_ALLOWED >= 30200 return YES; #else return (interfaceOrientation == UIInterfaceOrientationPortrait); #endif }

import import import import import import import import java.awt.*; java.awt.event.*; java.io.*; java.net.*; java.util.*; java.util.regex.*; javax.swing.*; javax.swing.table.*;

- (void)applicationWillResignActive:(UIApplication *)application; - (void)applicationDidBecomeActive:(UIApplication *)application;

Because you ve been careful when updating your view frames in the previous chapters, no real work is needed here. The code returns YES if you re building for the iPad device and returns YES for the iPhone if in portrait mode. All built-in interface components should rotate and resize automatically. Problems generally occur when you create custom views with hardcoded sizes. Making sure you develop according to the device s screen size will drastically reduce the amount of work you have to do in this method. Figure D.7 shows what the final interface looks like in landscape mode. For the most part, converting applications won t be as simple as this, because the collage is such a basic application. But the conversion patterns are the same. For more information about porting applications from the iPhone to the iPad, read the Starting Your Project section of Apple s developer article titled iPad Programming Guide ; you can find it by searching in the help documents.