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In addition to the data members, CocoaWGetController implements several methods that enable it to respond to user requests or actions, display application information, and interact with the model. The handle family of methods responds to user requests:
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handleSave Responds to messages to save the currently selected parameters to a file. Each of these methods uses support methods defined in the AppSupport class, discussed later in the section. handleReset Sets the model to its default values and sends a message to the view to update its display. handleViewParams Displays the currently selected parameters in the status field as a wget command line. handleDownload The most interesting of the defined methods. It is in charge of collecting and formatting wget parameters and running the wget task to retrieve all files based on user selections:
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- (IBAction)handleDownload:(id)sender { NSMutableArray *args; MyTask *task; [self displayCmdLine:@"Downloading files, please wait..."]; [limController getParameters:param]; [downloadController getParameters:param]; [retrievalController getParameters:param]; [htmlFtpController getParameters:param]; [param setValue:@"url":[url stringValue]]; [self raiseSheet]; args = [param getData]; task = [[MyTask alloc] init]; [task runTask:WGET_CMD theDirectory:directory theArgs:args getOutputFrom:1]; [self closeSheet:sender]; [AppSupport setStatusMsgWithDate:theStatus theMsg:[task output]]; [self displayCmdLine:@"Download complete."]; if ([task exitStatus] != 0) NSRunAlertPanel(@"Error getting files", @"wget returned an error.", @"OK", NULL, NULL ); [task release]; }
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The handleDownload method works as follows:
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It prints a message to the status text area telling the user that the download is beginning, and updates the application model by sending a message to each subcontroller to query its controls and update the model to reflect the current settings. It sends a message to the raiseSheet method to display the download Sheet, which has the side effect of disabling the interface for user interaction. It sends a message to the model to return the parameters in an array, where each element is a key/value parameter pair. To run the wget task, the method instantiates a MyTask object and sends a message to runTask, passing the launch path to the wget program (/sw/ bin/wget), the directory to store the retrieved file under, the command-line arguments, and where to read the wget output (0 for standard out or 1 for standard error). The MyTask class, which does much of the real work of interacting with the UNIX layer, is discussed later in this section. When the runTask method finishes, the download is complete. handleDownload closes the Sheet and updates the status field and prints the wget output. The task object is released.
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DownloadController, RRController, HtmlFtpController, and LIMController classes In addition to the main application controller ( CocoaWGetController ), CocoaWGet uses four subcontrollers that operate under the control of the main controller. As discussed in section 6.5.3, the main program window has four tabbed controls: each pane holds a related group of wget parameters and is controlled by a different controller. The Download pane is mediated by an instance of the DownloadController class; the Recursive Retrieval pane is mediated by an instance of the RRController class; and this pattern continues for the remaining panes and controllers. Each subcontroller implements similar functionality, so let s look at one of the controllers as an example. The DownloadController class implements the following data members and methods:
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@interface { IBOutlet IBOutlet IBOutlet IBOutlet IBOutlet DownloadController : NSObject NSTextField *concatFilesTo; NSTextField *limitDownloadSizeTo; NSPopUpButton *limitDownloadSizeType; NSButton *noDirCreateOnDownload; NSButton *noFilesUnlessNewerThanLocal;
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IBOutlet IBOutlet IBOutlet IBOutlet IBOutlet IBOutlet IBOutlet IBOutlet IBOutlet IBOutlet IBOutlet NSButton *noHostnamePrefix; NSPopUpButton *nRetries; NSTextField *outputDir; NSButton *overwriteFiles; NSPopUpButton *pauseBetweenRetrievals; NSButton *printServerResponse; NSButton *proxyOn; NSPopUpButton *removeNDirComponent; NSButton *resumeDownload; NSButton *spider; NSPopUpButton *waitBetweenFailedRetrievals;
} - (IBAction)handleSetConcatTo:(id)sender; - (IBAction)handleSetOutputDir:(id)sender; - (IBAction)reset:(WGetParameters *)param; - (void)getParameters:(WGetParameters *)param; @end
The data members perform functions similar to the other classes we looked at; primarily, they provide an access point to get the state of the pane s interface controls. You can divide the methods into two categories: methods that react to messages sent by the instance in response to user interface selections, and methods that interact with the data model. The handleSetConcatTo and handleSetOutputDir methods deal with user selections. For example, handleSetOutputDir is responsible for responding when the user clicks the Set button and getting a directory from the user. The method uses the getDirectory methods, which you will implement in the AppSupport class (discussed later in the section):
- (IBAction)handleSetOutputDir:(id)sender { [outputDir setStringValue:[AppSupport getDirectory:@"Output Directory"]]; }
The reset method handles updating the interface (view) to reflect the current state of the model. For each interface component, you get the corresponding value from the model and send it as a parameter to the control s set method:1
- (IBAction)reset:(WGetParameters *)param { [limitDownloadSizeTo setStringValue:[param getValue:@"--quota="]]; [outputDir setStringValue:[param getValue: @"--directory-prefix="]]; [pauseBetweenRetrievals setStringValue:[param getValue: @"--wait="]];
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