vb.net barcode printing 6: Cocoa Bindings in Java

Printer Data Matrix ECC200 in Java 6: Cocoa Bindings

CHAPTER 6: Cocoa Bindings
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Add a Tab View
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We re going to split up the application preferences into different three different groups, one for each of the three game objects the user can create. We ll separate the groups by placing the controls an NSTabView, which lets the user switch between different views by selecting from a list of tabs along the top. In the Library window, type in tab, then drag the resulting Tab View into your empty window. Resize it so that it nearly fills the window (as shown in Figure 6 1), leaving the standard margin that the blue lines will happily show you.
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Figure 6 1. The preferences window for DungeonThing looks like this after the creation and naming of the tabs
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When you drag out a new tab view from the Library, by default it has two tabs, but we want ours to have three. Click the tab view, and open the Attributes Inspector ( 1). There you will see a Tabs field. Click the tiny up-arrow to change its value from 2 to 3, and you ll see that there are now three tabs. Double-click on the title of each tab, and change their titles to Character Generation, Monster Generation, and Dungeon Generation, respectively. Figure 6 1 shows what your window should look like at this point.
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Character Generation Preferences
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Now let s start populating these tabs with some controls. First up is the Character Generation tab, so click on that tab to select it. By now you should be comfortable enough finding views and controls in the Library that we won t hold your hand and tell you every single step of grabbing these objects and dragging them into your window. It should be just about enough for you to look at Figure 6 2 and know that we re using a slider, a matrix of radio buttons, a matrix of checkboxes, and a handful of text fields for labels, including the small one out to the right of the slider.
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CHAPTER 6: Cocoa Bindings
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Figure 6 2. Here are the preferences for character generation in DungeonThing.
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Drag out each of these objects from the Library and align them roughly as you see in Figure 6 2. The only class there that you may not have used already is NSSlider, which works a lot like the NSLevelIndicator that we used in 4. To make it look and act like the one seen in the image, select it and open the Attributes Inspector ( 1). Give it 19 tick marks, check the box to make it stop only on tick marks, set its minimum and maximum values to 2 and 20, and its current value to 10. A bit further down, click to turn on the Continuous checkbox (so the slider will report its value continuously while the user is dragging it), and you re all set. Figure 6 3 shows you how it s done.
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Figure 6 3. Configuration of an NSSlider for selecting an integer between 2 and 20
One other adjustment that needs to be made, but can t be seen from the screenshot, is to make the matrix containing the checkboxes behave appropriately in response to mouse clicks. Because NSMatrix is designed to contain a variety of controls, it has multiple ways of interacting with its cells when the user clicks on one of them. Select the matrix of checkboxes, and in the Attributes Inspector, set the Mode popup to Highlight. This mode makes the matrix handle a click in a cell by toggling the clicked cell s selected state between zero and one, which switches the checkbox on and off. The last configuration required for this tab is to set the tags for the two radio buttons, so we can tell them apart later (the checkboxes don t need to have their tags set, because
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