Beginning Mac OS® X Programming

A.8. Chapter 8

A.8.1. Exercise 1 solution

1. In Xcode, add the following method to SlideShowWindowController.m's PrivateMethods category:

   - (void)tableDoubleClick:(id)sender;

2. Set the table view's double-click action using the following line of code. You need to add this line to SlideShowWindowController's windowDidLoad method.

   [mTableView setDoubleAction:@selector(tableDoubleClick:)];

   Normally, double-clicking a row in a table view begins an editing session; this is a common way of changing contents in a table view. If the rows in a table view aren't editable, the table view sends a double-click action along the responder chain. NSTableView doesn't have a double-click action by default, so you must supply one if you are interested in handling double-clicks. The double-click action otherwise behaves just like an NSControl instance's action.

3. Define the following tableDoubleClick: method in SlideShowWindowController's Table View Support section.

   - (void)tableDoubleClick:(id)sender
   {
       int row = [sender clickedRow];
   
       if (row != −1) {
           Slide *slide = [[self document] slideAtIndex:row];

   NSString *path = [slide filePath];
   
           [[NSDocumentController sharedDocumentController] openDocumentWithContentsOfFile:path display:YES];
       }
   }

   The NSDocumentController singleton class is responsible, among other things, for keeping track of the kinds of documents your application is capable of opening. You can ask the NSDocumentController to open a file at a specific path. If the application is capable of displaying ...