Classes in the Window System API in Java Drawer qrcode in Java Classes in the Window System API

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Classes in the Window System API use j2se qr codes integration tocreate quick response code for java Scan Barcodes with Mobile Phones from the TopComponent swing QR Code 2d barcode s getLookup() method, in turn, will be one which proxies the Lookups of whatever Nodes are currently selected. Nodes will be more thoroughly discussed in 9..

Classes in the Window System API As already mentioned, QR for Java much of the Window System API consists of XML le formats that the default Window System implementation understands. As of NetBeans 5.5, it is rarely necessary to edit such les directly more often they will be created by various wizards and templates.

The surface area of the programmatic API of the Window System is relatively small. Most applications will not touch any classes but TopComponent. Some classes you may encounter are:.

TopComponent A TopComponent is just qr codes for Java a JPanel with some additional methods that allow it to be managed by, and interact with, the Window System. Methods that are likely to be useful for controlling TopComponents lifecycle in the UI are shown in Table 8.1.

. Table 8.1: Commonly us ed lifecycle methods of TopComponent Name Description Causes the component to appear in a tab in a tabbed container in the UI..

open(). requestVisible() Asks the Window System to make this component selected in the tabbed container it lives in. requestActive() Asks the Window System to transfer keyboard focus to this component, making it t QR Code 2d barcode for Java he one which owns UI-wide selection. Asks the Window System to close the component, removing it from the UI..

close(). For each of the lifecy jdk QRCode cle methods from Table 8.1, there is a corresponding noti cation method which you can override to do. 8 . The Window System some work when the com ponent is opened, selected, activated, etc.: componentOpened(), componentShown(), componentActivated(), componentDeactivated(), componentHidden(), and componentClosed(). The nal stage of the lifecycle is persisting state information across sessions.

For this, TopComponent implements Externalizable.

It is much like serialization except that what you save is a proxy object for the object you want to save. That proxy object knows how to recreate the original object. In other words, if you want to remember that a component of a certain type was open and editing a certain le type, what you probably want to save is the path to the le that was being edited and recreate a component on restart making it open the same le in the same kind of editor as opposed to serializing and writing out to disk all of the component s elds and state and every listener that might be attached to it.

Externalizable enables you to save a proxy object for the component that you want to save, with enough data to recreate it on restart. Note that you typically do not need to implement the methods of

Externalizable (writeExternal() and readExternal()) directly; rather, you simply override the writeReplace() method to return a serializable object that is serialized in place of the component.. Mode The name of this class is somewhat unfortunate, but cannot be changed for backward compatibility reasons. The concept here is docking mode a way in which a component can be docked into a window. For practical purposes, a Mode is a tabbed container you see in the main window.

4 It is relatively rare to need to programmatically interact with Modes. Modes are created declaratively using XML, as described in Section 8.7.

. WindowManager is the overall manager for the state of WindowManager the application s user interface. It is relatively rare to write code that 4. Though it should be noted that Mode is not a UI component per se. It is the model for the content of a tabbed container.

. Using TopComponent touches this class mos t often, you simply fetch a reference to the main window that you need for some reason (for example, WindowManager.getDefault().getMainWindow()).

. TopComponentGroup A To QR-Code for Java pComponentGroup is a handle that allows activating one TopComponent to cause other TopComponents to change. state. This is how the IDE s Form Editor (aka Matisse) causes activating the form editor component to trigger opening and selecting the component palette and the property sheet..

Using TopComponent The simplest use of th e Window System is creating a component and showing it in the main window, which we will do now. We will create a simple scratchpad component. In the real world, a scratchpad is a pad of paper for writing down temporarily useful, but ultimately disposable information.

Our Scratchpad window will simply contain a text area where text can be pasted and copied back. 1. Create a new empty module, using New Project (Figure 8.

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