vb.net barcode font 10: Windows and Menus and Sheets in Java

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CHAPTER 10: Windows and Menus and Sheets
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Inspector, and configure the checkbox s Value binding, connecting it to MenuLab_AppDelegate using the turbo key path. Next, it s time to create some menu items (Figure 10 7 shows you what it should look like when we re done). Double-click the MainMenu object in the nib window, so you can see the menu we re going to add to. If any of the submenus are open, click in the menu window s title bar to close them. Now, search for submenu in the Library, and drag the resulting Submenu Menu Item over to the menu, placing it between the View and Window menus. Double-click on the new top-level menu item, and change its title to Tools. Clicking on it again will reveal that it already contains a single item (titled Item ). Click to select it, then press D to duplicate it, which places an identical item just below it.
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Figure 10 7. Setting up menu items for toggling a boolean attribute
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At this point, the lower of the two new menu items should be selected. Double-click to select the title text, and rename it Turbo Off. Ctrl-drag from it to the MenuLab_AppDelegate icon in the main window, and connect to the toggleTurbo: action. Now bring up the Bindings Inspector, and configure the menu item s Enabled binding, connecting to MenuLab_AppDelegate using the turbo key path. This ensures that the menu will only be enabled if the value of app delegate s turbo property is YES. Now go back to the upper menu item, renaming it Turbo On, and connecting it to the app delegate s toggleTurbo: action just like you did for Turbo Off. Because the condition for whether this menu item should be enabled or disabled is the opposite of the condition for the Turbo Off menu item, the binding is going to be a little different. It should also have its Enabled binding configured with MenuLab_AppDelegate and the turbo key path, but below that you also need to specify NSNegateBoolean as the Value Transformer. Save your changes, go back to Xcode, and Build & Run. You should see the Turbo Switch window appear, containing a checkbox. Your app should have a Tools menu containing Turbo On and Turbo Off items, only one of which should be enabled at a time, and clicking the enabled item should toggle the checkbox and change the state of both menu items, so that now only the other item is enabled. Also, clicking the checkbox should affect the enabled/disabled state of each menu item appropriately.
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CHAPTER 10: Windows and Menus and Sheets
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You ve now seen a simple way to enable and disable menu items through the use of bindings, but we d be remiss if we didn t point out that this usage is sort of artificial, and not really the way that you d normally deal with application-wide boolean values in a menu. In a case like this, instead of two menu items, one of which is always disabled, you re more likely to use a single menu item showing a checkbox to indicate a state, just like the checkbox in our window does. As it turns out, that s even easier to do than what we ve already done. Go back to Interface Builder, select the Turbo Off item, and duplicate it with D. Rename the new item Turbo, and configure its Value binding, connecting to MenuLab_AppDelegate using the turbo key path. That s it! Save, back to Xcode, Build & Run, and try it out. Note that this quick method doesn t even need the toggleTurbo: method, so if you want, you can delete that method along with the Turbo On and Turbo Off items.
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Enabling/Disabling With First Responder
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Now we re going to show you a more common way of automatically enabling and disabling menu items, which gives you more fine-grained control, so that the enabled state of each menu item can be updated automatically depending on which window is selected, which text field or other control in a window is selected, and so on. This method works using the responder chain, somewhat similar to how the color panel finds an object to pass a selected color to, as described earlier in this chapter. In this case, the method that s searched for along the responder chain is validateUserInterfaceItem:, whose declaration looks like this:
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- (BOOL)validateUserInterfaceItem: (id <NSValidatedUserInterfaceItem>)anItem;
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If it s implemented in the responder chain s objects, this method is called at the appropriate time to see if the user interface item (in this case, a menu item) should be enabled or not. In implementing this method, you can use anItem to get some information about the object that s going to be enabled or disabled; you can ask it for its action (so you can compare with one of your own methods) and for its tag (in case you d rather compare against a control tag you ve established in IB). Usually you ll just want to use the action. We ll show you how this works in just a bit, but first we should probably clarify just when this method is called. Here s the basic idea: any time Cocoa is about to draw the menu, generally in response to the user clicking on the menu bar, some checks are made for each menu item to determine whether it should be enabled or disabled. The flowchart in Figure 10 8 gives a rough outline of the sequence of events.
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