Second, you need to change the semi-colons that are used in Windows to separate files in the classpath with colons, the standard UNIX separator. Here's the revised command:.
Bringing your Java Application to Mac OS X
Figure 2. We get a lot for free. If you don't specify a look and feel for your Java application, the Aqua look and feel is used as the default on Mac OS X. You see the buttons and tabs and scroll bars help this application look as if it were written for Mac OS X. In fact, with the latest version of JUnit , the bar may be more three dimensional. It will also be blue and not green. Although this doesn't look and feel exactly like a native application, this is a great first step that required no effort from you. Let's see how we can improve on this by setting some runtime properties. On a Mac, application menu bars belong at the top of the screen.
To a longtime Windows user this may seem crazy while to an experienced Mac user the top of the screen is the natural location for a menu bar. This is a religious issue and neither side is likely to convince the other.
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Ideally, if you are writing a Java application that targets both platforms and perhaps others , you would like it to feel like a Windows application on a Windows machine and like a Mac application on a Mac. Fortunately, Apple has made it easy for you to customize the location of your menu bar when running on a Mac while leaving it where it is in the other look and feels so long as you have a top level JFrame for which you have assigned a menu bar using the setMenuBar method. Set the system property com.
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You can do this at the command line like this:. Compare the two images below. In the first, the system property hasn't been set and the JUnit menu appears within the JFrame. In the second, the system property has been set and the JUnit menu moves to the screen menu bar next to the Apple and the Application menus. Figure 3. The JUnit menu bar within the JFrame. Figure 4.
The JUnit menu bar in its proper place. While we're here, let's look a little closer at the Application menu. This is the menu for the currently running application. It appears just to the right of the Apple menu the menu underneath the Apple logo. In this case the application is the name of the class we're running: This is also the name displayed when we mouse over the application icon in the dock.
We can change this name in both locations by setting the -Xdock: To keep the command line from getting overloaded with too many options we're only experimenting with one parameter at a time. Of course you can add as many of these as you'd like.
Once you have a lot of options you'll get tired of typing them all in. In the third installment we look at options for packaging and distributing your Java application to Mac OS X owners. For now, we're only setting the parameter for setting the name of the application. If you have an icon for your application that you'd like to assign to appear in the dock you can use the -Xdock: You'll notice in the picture below that the JUnit menu is back inside of the JFrame. As desired, the name of the Application menu has been changed. Here's a look at the Application menu that is automatically created for JUnit.
You can see that the name of the application has been filled in next to the options for Hide and Quit. A Java menubar example. Hide Mac Desktop clutter with DesktopShield free. Passed out for the first time anniversary. Yoga is about how the Will can free us How to get the first element from a Scala Set.
If you try to add a menu item to a second menu, the menu item will be removed from the first menu before being added to the second. For a way of implementing multiple components that do the same thing, see How to Use Actions. Other methods in the preceding code include setAccelerator and setMnemonic , which are discussed a little later in Enabling Keyboard Operation. To detect when the user chooses a JMenuItem , you can listen for action events just as you would for a JButton. For examples of handling action and item events, see the button , radio button , and check box sections, as well as the list of examples at the end of this section.
Menus support two kinds of keyboard alternatives: Mnemonics offer a way to use the keyboard to navigate the menu hierarchy, increasing the accessibility of programs. Accelerators , on the other hand, offer keyboard shortcuts to bypass navigating the menu hierarchy. Mnemonics are for all users; accelerators are for power users. A mnemonic is a key that makes an already visible menu item be chosen. For example, in MenuDemo the first menu has the mnemonic A, and its second menu item has the mnemonic B. This means that, when you run MenuDemo with the Java look and feel, pressing the Alt and A keys makes the first menu appear.
While the first menu is visible, pressing the B key with or without Alt makes the second menu item be chosen. A menu item generally displays its mnemonic by underlining the first occurrence of the mnemonic character in the menu item's text, as the following snapshot shows. An accelerator is a key combination that causes a menu item to be chosen, whether or not it's visible. For example, pressing the Alt and 2 keys in MenuDemo makes the first item in the first menu's submenu be chosen, without bringing up any menus.
The following snapshot shows how the Java look and feel displays a menu item that has an accelerator.
- Java's MenuBar versus the Mac MenuBar & other ?s.
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You can specify a mnemonic either when constructing the menu item or with the setMnemonic method. To specify an accelerator, use the setAccelerator method. Here are examples of setting mnemonics and accelerators:. As you can see, you set a mnemonic by specifying the KeyEvent constant corresponding to the key the user should press. To specify an accelerator you must use a KeyStroke object, which combines a key specified by a KeyEvent constant and a modifier-key mask specified by an ActionEvent constant. Because popup menus, unlike regular menus, aren't always contained by a component, accelerators in popup menu items don't work unless the popup menu is visible.
To bring up a popup menu JPopupMenu , you must register a mouse listener on each component that the popup menu should be associated with. The mouse listener must detect user requests that the popup menu be brought up. The exact gesture that should bring up a popup menu varies by look and feel. In Microsoft Windows, the user by convention brings up a popup menu by releasing the right mouse button while the cursor is over a component that is popup-enabled. In the Java look and feel, the customary trigger is either pressing the right mouse button for a popup that goes away when the button is released or clicking it for a popup that stays up.
Popup menus have a few interesting implementation details. One is that every menu has an associated popup menu. When the menu is activated, it uses its associated popup menu to show its menu items. Another detail is that a popup menu itself uses another component to implement the window containing the menu items.
Depending on the circumstances under which the popup menu is displayed, the popup menu might implement its "window" using a lightweight component such as a JPanel , a "mediumweight" component such as a Panel , or a heavyweight window something that inherits from Window.
Lightweight popup windows are more efficient than heavyweight windows but, prior to the Java SE Platform 6 Update 12 release, they didn't work well if you had any heavyweight components inside your GUI. Specifically, when the lightweight popup's display area intersects the heavyweight component's display area, the heavyweight component is drawn on top.
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This is one of the reasons that, prior to the 6u12 release, we recommended against mixing heavyweight and lightweight components. If you are using an older release and absolutely need to use a heavyweight component in your GUI, then you can invoke JPopupMenu.
Native Swing Menu Bar Support For MacOS X In Java - Stack Overflow
For information on mixing components in the 6u12 release and later, please see Mixing Heavyweight and Lightweight Components. Because menus are made up of ordinary Swing components, you can easily customize them. And because JMenuBar uses BoxLayout , you can customize a menu bar's layout just by adding invisible components to it. Here is an example of adding a glue component to a menu bar, so that the last menu is at the right edge of the menu bar:.