vb.net barcode printing Updating the GUI in Java

Drawer DataMatrix in Java Updating the GUI

Updating the GUI
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Now that we have our updated data model ready to go, it s time to move on to create the GUI. We re going to leave the existing window almost intact, and add a couple of new windows, one focused on MythicalBands, and one focused on MythicalVenues.
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Create the Band Window
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First, we ll create a new window to show a list of MythicalBands. Open up MainMenu.xib in InterfaceBuilder, and create a new NSWindow. Use the Attributes Inspector to name this window Mythical Bands. We re going to use Xcode s built-in Core Data GUI creation assistant again, so switch back to Xcode. Bring up the latest version of the data model, and drag the MythicalBand entity from the graph paper area to the new window you just created in Interface Builder (remember, if you can t see that new window after you ve started dragging, you can switch back to Interface Builder by pressing Tab). When you release the entity over the window, you ll see the New Core Data Entity Interface assistant appear, just like when you started creating the GUI for 7. Select Master/Detail View from the popup list, and click to enable the Search Field and Add/Remove checkboxes (this time leaving the Details Fields checkbox unchecked), then click Next. The next window asks which attributes we want to display. Now our
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CHAPTER 8: Core Data Relationships
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MythicalBand entity has some relationships, and we don t want to display those just yet, so turn off the members and gigs checkboxes, and click Finish. Now you ll have a fresh new GUI in your window, very similar to what was created for the MythicalPerson entity in 7. This window is going to be focused on the bands, and even has Mythical Bands as its title, so let s lose the box surrounding all the stuff that was created for us: Click on the box title (which is also Mythical Bands) and select Layout Unembed Objects from the menu. Then select the window by clicking its title bar, and select Layout Size To Fit from the menu, which shrinks the window to make it precisely fit the content, and finally delete the unnecessary Fetch button. The resulting window should now look like Figure 8 8.
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Figure 8 8. The beginnings of the Mythical Band window
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Now save your changes, switch to Xcode, and Build & Run the app. You ll see that the new window appears, and that you can add some bands, edit their names directly in the table view, and save your changes.
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Giving Useful Names to Array Controllers
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So, you now have two windows, each focused on a single entity, but so far have no way of connecting the two together. We re going to address this in a moment, but before we do, there s a change you should make in your nib file that will be helpful when configuring the new bindings we re about to create. Each time we ve created a piece of the GUI by dragging in an entity from Xcode s data modeler, the assistant creates an NSArrayController whose visible name (the name that appears within Interface Builder) defaults to something like <entity name> Array Controller, in our case Mythical Person Array Controller and Mythical Band Array Controller. As you may have noticed when connecting some of the bindings in 7, these names seem a bit longer than what Interface Builder is really designed to show. They barely fit into the popup buttons in the Bindings Inspector, and they make
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CHAPTER 8: Core Data Relationships
all of the summary info shown for each bound attribute overflow, with some of its text being replaced with ellipses (see Figure 8 9).
Figure 8 9. Lengthy names for our array controllers make it harder to see what we re dealing with. This is the Value binding for one of the sliders in our GUI.
You can improve this situation by changing the names of your controllers. Changing the names won t modify any of the bindings you ve configured, or change anything for your application s users. The only one who ll see the change at all is you, but remember that you re important, too. Just as it s important to format your source code in such a way that it s easy for you to scan through it and find what you need, doing what you can to streamline your editing experience in Interface Builder will save you time and frustration. So, go to the main nib window, make sure you re looking at the icon view (the leftmost icon in the row of small icons at the upper left should be selected), and find your Mythical Person Array Controller. Click on its name, and change it to just Persons. Do the same for Mythical Band Array Controller, changing its name to Bands. Doing this will eliminate a lot of words (e.g. Mythical, Array, and Controller ) that are otherwise spread a bit too liberally throughout your nib file, and leave you with a display that s hopefully easier for your eyes and brain to scan and comprehend quickly (see Figure 8 10).
Figure 8 10. Renaming our array controllers lets us see the information we need in a slightly more compact way. This is the same binding that was shown in Figure 8 9, after changing the array controller s name.
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