android barcode scanner java code 10: Windows and Menus and Sheets in Java

Creator ECC200 in Java 10: Windows and Menus and Sheets

CHAPTER 10: Windows and Menus and Sheets
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Then edit SheetLab_AppDelegate.m, adding the following method implementations:
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#import "SheetLab_AppDelegate.h" @implementation SheetLab_AppDelegate - (IBAction)runSaveSheet:(id)sender { NSSavePanel *panel = [NSSavePanel savePanel]; [panel beginSheetForDirectory:nil file:nil modalForWindow:window modalDelegate:self didEndSelector:@selector(savePanelDidEnd:returnCode:contextInfo:) contextInfo:NULL]; } - (void)savePanelDidEnd:(NSSavePanel *)sheet returnCode:(int)returnCode contextInfo:(void *)contextInfo { if (returnCode==NSOKButton) { NSRunAlertPanel(@"Saving! (just pretending)", @"You chose to save in the file:\n\n%@", nil, nil, nil, [sheet filename]); } } @end
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The runSaveSheet: method grabs the standard save panel, and tells it to run modally attached to a window (using the window instance variable). It also specifies what method should be called when the sheet is done, passing in the selector of the next method, savePanelDidEnd:returnCode:contextInfo:, which gets called at the end of the modal session, at which point it can check the returnCode (to see whether the user clicked Save or Cancel), access the save panel to get the chosen filename, and so on. Now open up MainMenu.xib in Interface Builder, and add a new button to the empty window that s been provided for you. Label the button Run Save Sheet, and connect it to the app delegate s runSaveSheet: action method. The final thing to connect here is the app delegate s window property, so Control-drag from the app delegate to the window you have, and select window from the list of choices. Save your changes, switch back to Xcode, Build & Run, and you should see this all working. Clicking the Run Save Sheet button brings up the modal save panel, attached as a sheet on top of the window you just clicked in.
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Wrap-up
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This chapter provided an introduction to several key parts of the Cocoa GUI experience, as well as a few examples of how the responder chain is used. These features are crucial to making a professional-quality Mac application. Mac users tend to be pretty unforgiving when applications use non-standard behaviors without a good reason, so it s important to know how to deal with windows and menus in ways that users will recognize. In the next chapter, we ll build on this knowledge as we explore Cocoa s classes for dealing with documents and their associated windows.
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Document-Based Applications
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So far, the applications we ve built in this book all have one major shortcoming in common: each of them acts in sort of an all-or-nothing way. You ve either got a particular piece of data in the one backing store that the application is using (if it s using one at all), or you don t have it anywhere. None of them has any notion of letting you split your data into the discrete, unrelated storage units that we call documents. Although having everything in a single database is good for some purposes, for others it s a huge hindrance. What if you want to share just a part of your data with someone else, or you want to be able to view details for two or more of the same kind of Core Data entity, in multiple windows beside one another, to be able to compare them Most people are familiar with these possibilities from using almost any modern application, where multiple documents can be open simultaneously, and actions in one don t affect the others. As it turns out, the good folks at Apple thought of this years ago, and built document support right into Cocoa, centered around the NSDocument and NSDocumentController classes. Cocoa s document architecture gives you access to a whole lot of infrastructure that you d otherwise have to build yourself, such as managing the window and its title bar, dealing with the open panels and save panels, and more. If you re using Core Data in your application, it will even take care of the actual opening and saving all on its own, so your application code never even has to touch a document file. In this chapter, you ll learn the basics of how to create a document-based Cocoa application, including the use of Core Data, by creating an application called ColorMix. ColorMix lets the user choose two colors using the standard system color panel, and then presents a grid of color swatches demonstrating different methods of blending the two colors together. Each set of two chosen colors (and its 15 blended colors) can be saved in a document, which is just like any other file and can be saved anywhere you like, and then reopened later on. Along with learning about how Cocoa does documents, you ll also build some simple view classes for drawing colored rectangles, and interact
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