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There are a number of properties that you can set to control features like icons and labels. For example, on a Button component, you can define Text, Icon, and IconPosition, as shown for the Previous and Next buttons in Figure 14-1. You can also set AccessKey to define a quick
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FIGure 14-1. Label and icons for buttons access key to the button. In Figure 14-1, P and N are access keys for the Previous and Next buttons. For a Toolbar Button component, you can define Text, Icon, HoverIcon, DepressedIcon, and DisabledIcon, as shown in Figure 14-1, where the icons represent adding, editing, and deleting a customer. TIp When you define icons for your buttons, JDeveloper prompts you to copy each icon into the project. However, if you import all your icons into your project, you can select the icons from a drop-down list instead of manually selecting and importing each icon. Select File | Import and then select Web Source. You can now import all the required icons into the ViewController project.
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Menus are another way of allowing your users to initiate business functions and navigate through the application. As with buttons, a menu item has an ActionListener property to allow the selection of the menu item to trigger a method, and an Action property for initiating control flow navigation to a new page or page fragment. As noted earlier, many of the layout components, such as Panel Collection, have facets specifically for menus. Figure 14-2 shows an example of a menu within the menus facet of
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FIGure 14-2. Using a menu in an ADF application
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a Panel Collection. Here you can see some of the features of menus, including submenus, accelerator key combinations, and icons.
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Creating a Menu
As with buttons, you can drag methods from the Data Controls panel and drop them as menu items, or you can create your menu structure first and then bind each of the menu items when you are ready. TIp If you create a menu first, you can drag and drop methods from the Data Controls panel onto a menu item, and JDeveloper will automatically bind the existing menu item to that method. JDeveloper will display the Confirm Component Rebinding dialog to allow you to choose which properties should be overridden. The typical structure of a menu is shown in Figure 14-3. Depending on the facet in which you place the menu, you will start with either a Menu or a Panel Menu Bar, represented by the tags af:menu and af:menuBar, respectively. If you want a menu bar with many top-level items, then you would use af:menuBar; however, because this menu is within a facet that only allows one
FIGure 14-3. A menu structure in the Structure window
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Buttons and Menus
top-level menu item, af:menu is used. This represents the menu item that opens up a drop-down menu. Each of the menu items within the Menu component is a Menu Item component, represented by the tag af:commandMenuItem, as shown in Figure 14-3. TIp If you are unsure what component to insert inside a facet, or as a child of a component, then right-click the component or facet and select Insert Inside. JDeveloper will guide you as to which component makes sense to insert inside this current facet or component. Within af:menu you will typically have one or many instances of af:commandMenuItem. These are the menu items that are used to initiate an action. As shown in Figure 14-3, you can also nest many instances of af:commandMenuItem within an af:group tag. This is used to group related menu items and automatically includes a visual separator. You can also create submenus by using an instance of af:menu inside another af:menu. Figure 14-2 shows the runtime behavior and Figure 14-3 show the associated design time.
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