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SWT�l��g的生命周期（�l�一个简单的SWT�E�序实例�?qi��ng)详解�?j��)

燕然 — Tue, 04 Jul 2006 06:52:00 GMT

上一��详�l�介�l�了(ji��n)一个SWT实例�Q�这一��接下来介绍SWT�l��g的生命周�?br />本文地址�Q?a id="Editor_Edit_hlEntryLink" title="view: SWT�l��g的生命周期（�l�一个简单的SWT�E�序实例�?qi��ng)详解�?j��)" href="/cpenet/archive/2006/07/04/56539.html" target="_blank">http://www.aygfsteel.com/cpenet/archive/2006/07/04/56539.html

本篇译自�?/span> Eclipse.Building.Commercial.Quality.Plug.ins.2nd.Edition 》第四章�W�二节，希望对入门者有所帮助�?/span>

(t��ng)

�l��g的生命周�?/span>

设计 SWT 的一个目标就是小而灵巧。�ؓ(f��)�?ji��n)达到这个目标，一个基本的设计�{�略�Q�就是尽可能的�ɾl��g的状态存储在�q�_��l��g中而不是存储在 SWT �l��g�?/span> ( �q�句话，我不理解�Q�也��译的不明白�Q�附原文�Q?/span> To achieve this, a basic design decision was made that as much widget state as possible would be stored in the platform widget rather than in the SWT widget.) 。这�?/span> Swing 形成显著的对比， Swing �?/span> Swing �l��g中维护了(ji��n)所有的�l��g状态�?/span> ( 可能是这��P��(x��) SWT 把各个组件的状态交�l�系�l��^台来��理�Q��?/span> Swing 自己��理各个 Swing �l��g的状态，�q�样 Swing ��复杂，耗费的资源，内存的需求也多，不知道是不是 J ) 。通过不把�pȝ��q�_��U�别的组件信息复制过来自��q��护， SWT ��非常的��y而且对内存的需求也相应��?/span>

辑ֈ��q�个目的所付出的代价就�?/span> SWT 的组件不能够自己独立存在。当一�?/span> SWT �l��g被创建时�Q�同时立卛_��pȝ��q�_��下也创徏�?ji��n)该�l��g的对应体。接下来�Q�几乎所有对该组件的信息状态请求都�?x��)由�q�_��来处理�?/span>

大部分的�pȝ��q�_��在创��Z��个组件时�Q�需要该�l��g明确的父�l��g的上下文�Q�所�?/span> SWT 需要一个父�l��g来最为它的构造声明。许多��^台在创徏�l��g时还需要该�l��g的特定风格参数的讑֮�。例如：(x��)按钮有复选框�Q�单选框�Q�简单按钮和文本域有单行和多行之分�?/span>

�?/span> SWT �c�M��Q�风��g��D는�整数�c�d��来定义且不会(x��)更改。风格参数被�l�织在一��P��其它各种构造器传递着�q�些参数来创��Z��个组件的初始风格。注意到�Q�所有的�q�_��q�不支持所有的风格�Q�所以在很多情况下，被请求的风格被认为是一�U�提�C�，它或�怼�(x��)或许不会(x��)对一个特�D�的�q�_��产生影响�?/span>

�?/span> SWT �l��g不在需要时�Q�一些��^台要求作出明��的释放。对于组件本�w�和一些资�?/span> ( 例如�Q�图形，字体�Q�颜�?/span> ) 而言�Q�他们已�l�具备了(ji��n)�pȝ��的这个要求。基本的规则是：(x��)如果你创��Z��(ji��n)一个组�Ӟ��p��使用 dispose() �Ҏ(gu��)��来撤销�q�个�l��g。如果你使用�?ji��n)一些系�l�资源，例如�pȝ��颜色�Q�你��׃��需要释放他们�?/span>

�q�运的，当一个组件被释放的，它的所有子�l��g�?x��)自动地被释�?/b>。这意味着�Q�如果你释放�?ji��n)一�?/span> shell �Q�那么所�?/span> shell 包含的组仉��?x��)被自动释放�?/span>

燕然 2006-07-04 14:52 发表评论

燕然 — Mon, 03 Jul 2006 12:09:00 GMT

Eclipse.Building.Commercial.Quality.Plug.ins.2nd.Edition SWT (t��ng) 本文地址�Q?a id="Editor_Edit_hlEntryLink" title="view: 一个简单的SWT�E�序实例�?qi��ng)详�? href="/cpenet/archive/2006/07/03/56407.html" target="_blank">http://www.aygfsteel.com/cpenet/archive/2006/07/03/56407.html

HelloWorld (t��ng)一�?/span>SWT 首先建立一�?span lang="EN-US">java工程。在开始��?span lang="EN-US">SWT之前�Q�需要将SWT库文件添加到工程的类路径中。步骤如下：(x��)

1. (t��ng) (t��ng) (t��ng) 下蝲SWT。在Eclipse SDK的下载页面中�Q�提供了(ji��n)独立版本�?span lang="EN-US">SWT下蝲。找到标�?span class="docemphstrong">SWT Binary and Source的栏目。下载适合你操作系�l�的版本�Q�不用解压，直接保存到硬盘�(sh��)��?/span>

2. (t��ng) (t��ng) (t��ng) �?span lang="EN-US">Eclipse菜单栏，选择File-�?span lang="EN-US">Import...打开导入向导

3. (t��ng) (t��ng) (t��ng) 选择Existing Projects into Workspace�Q�点�?b>Next按钮

4. (t��ng) (t��ng) (t��ng) 选择 Select archive file�q��?Browse...按钮来找��C��刚才下蝲�?span lang="EN-US">SWT文�g�?

(t��ng)5. (t��ng) (t��ng) (t��ng) 点击Finish按钮�Q�完�?span lang="EN-US">SWT导入�?

(t��ng)6. (t��ng) (t��ng) (t��ng) 右键点击你徏立的工程�Q�选择Properties 来打开Properties对话框�?/span>

(t��ng)7. (t��ng) (t��ng) (t��ng) 选择 Java Build Path -> Projects tab�q�点�?span class="docemphstrong">Add按钮.

(t��ng)8. (t��ng) (t��ng) (t��ng) 选择 org.eclipse.swt工程�Q?点击 OK�Q�完成添�?span lang="EN-US">SWT库到你的工程�?span lang="EN-US">(见图1).

(t��ng)

(t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) 1

SWT 代码

现在在你建立�?span lang="EN-US">java工程中，新徏一�?span lang="EN-US">java文�g�Q�取名�ؓ(f��) HelloWorld。在HelloWorld.java文�g中把main()�Ҏ(gu��)��覆盖��Z��下代�?span lang="EN-US">: (t��ng) (t��ng)

1 (t��ng) (t��ng) (t��ng) public (t��ng) static (t��ng) void (t��ng)main(String[] (t��ng)args) (t��ng){
2 (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)Display (t��ng)display (t��ng) = (t��ng) new (t��ng)Display();
3 (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)Shell (t��ng)shell (t��ng) = (t��ng) new (t��ng)Shell(display);
4 (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)shell.setText( " Hello (t��ng)World " );
5 (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)shell.setBounds( 100 , (t��ng) 100 , (t��ng) 200 , (t��ng) 50 );
6 (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)shell.setLayout( new (t��ng)FillLayout());
7 (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)Label (t��ng)label (t��ng) = (t��ng) new (t��ng)Label(shell, (t��ng)SWT.CENTER);
8 (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)label.setText( " Hello (t��ng)World " );
9 (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)Color (t��ng)red (t��ng) = (t��ng) new (t��ng)Color(display, (t��ng) 255 , (t��ng) 0 , (t��ng) 0 );
10 (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)label.setForeground(red);
11 (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)shell.open();
12 (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) while (t��ng)( ! shell.isDisposed()) (t��ng){
13 (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) if (t��ng)( ! display.readAndDispatch()) (t��ng)display.sleep();
14 (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)}
15 (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)red.dispose();
16 (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)display.dispose();
17 (t��ng) (t��ng)}

在覆盖了(ji��n)上述代码�?span lang="EN-US">, 选择菜单栏中�? Source -> Organize Imports命��o(h��) (或者按Ctrl+Shift+O) 来把需要引用的SWT包导入到HelloWorld.java文�g�? �?span lang="EN-US">

2行：(x��)每个��Z��SWT的应用程序都有一�?span lang="EN-US">Display�cȝ��实例。用来将低层�q�_��?span lang="EN-US">SWT�q�行链接。除�?ji��n)管�?span lang="EN-US">SWT的事件��@环，�q�能讉K��SWT需要的�q�_��资源。在16行，display实例��会(x��)提交�l�垃圾收集器�?span lang="EN-US">

3行：(x��)每一个窗口都有一�?span lang="EN-US">Shell�H�口框架�Q�来与用戯��行交互�?span lang="EN-US">Shell像所有的windows�pȝ��一��h��处理动作行�ؓ(f��)�Q��ƈ作�ؓ(f��)�H�口控�g的放�|�场所�?span lang="EN-US">

4行：(x��) setText()�Ҏ(gu��)��讄��H�口的标�?span lang="EN-US">.

5行：(x��) setBounds() �Ҏ(gu��)��讄��H�口的大��和攄��的位�|?span lang="EN-US">. 在这个例子中, 讄��H�口�?span lang="EN-US">200个像素宽�Q?span lang="EN-US">50个像素高�Q��ƈ攑֜��d��q�的左上�?span lang="EN-US">100x100像素的位�|�上�?span lang="EN-US">

�W?span lang="EN-US">6行：(x��) setLayout()�Ҏ(gu��)�� 讄��H�口框架的布局. FillLayout�Q�充满式布局��理器，使得�l��g大小�?x��)尽量的充满整个容�?span lang="EN-US">.SWT的布局��理器会(x��)在以后详�l�介�l��?

7行：(x��)�?span lang="EN-US">shell上新��Z��个简单的label�l��g�q�居中显�C?span lang="EN-US">label的文本内宏V�?span lang="EN-US">

8行：(x��) setText() �Ҏ(gu��)�� 讄��label的文本内宏V�?span lang="EN-US">

9行：(x��)创徏一个红色的颜色�cȝ��实例。你也可以��用以下语句获得系�l�红色的实例�Q?span lang="EN-US">

10行：(x��) setForeground() �Ҏ(gu��)�� (t��ng)讄��label的前景色

11行：(x��)到目前�ؓ(f��)止，�H�口框架�q�是不可见的。通过open()�Ҏ(gu��)��使得�H�口可见�?span lang="EN-US">

12行：(x��) while语句循环��(g��)��窗口有没有关闭�?span lang="EN-US">

�W?span lang="EN-US">13行：(x��)display 控制事�g的��@�?span lang="EN-US">. readAndDispatch() �Ҏ(gu��)��从��^台的事�g队列中读取事�Ӟ��q�分配他们到合适的处理�E�序(接收�?span lang="EN-US">)。只要队列中一直有事�g可以处理�Q�这个方法一直返�?span lang="EN-US">true�Q�当事�g队列为空�Ӟ��则返�?span lang="EN-US">false(因此允许用户界面UI�U�程��Z��sleep状态直��C��仉��列不为空)�?

15,16行：(x��)当��@环检��到�H�口被关闭时�Q�需要将color�Q?span lang="EN-US">display和一些相兌��的��^台资源释放。注意到�pȝ��颜色实例(colors)��会(x��)被提交释放�?span lang="EN-US">

(t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)

java应用�E�序�Q�会(x��)使用Run As -�?/b> Java Application UnsatisfiedLinkError SWT Run As > SWT Application SWT 2 2 run (t��ng)

run 3 (t��ng)

(t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) 3

(以后�l�箋(hu��))

燕然 2006-07-03 20:09 发表评论

燕然 — Fri, 30 Jun 2006 12:10:00 GMT

org.eclipse.ui包是应用�E�序界面的包, Eclipse的��^台的界面也是使用�?ji��n)这个�?
包中有接口IWorkbenchWindow,API中的说明

A workbench window is a top level window in a workbench. Visually, a workbench window has a menubar, a toolbar, a status bar, and a main area for displaying a single page consisting of a collection of views and editors.

Each workbench window has a collection of 0 or more pages; the active page is the one that is being presented to the end user; at most one page is active in a window at a time.

This interface is not intended to be implemented by clients.

一个工作台�H�口是一个工作台的顶层窗�?从视觉上�?一个工作台�H�口拥有一个菜单栏,工具�?状态栏和一个主区域,用来昄��包括昄��和编辑的一个页�?

每个工作台窗口有0个或者更多的��面.�z�d��的页面是一�U�显�C�给当前使用者的��面.大多数情况下,在一个时��d��有一个页面处于活动状�?

�q�个接口不打��由用户来实�?

(to more)

燕然 2006-06-30 20:10 发表评论

Rich Client Tutorial Part 1�Q�翻译）(j��)

燕然 — Fri, 30 Jun 2006 10:27:00 GMT

Rich Client Tutorial是Eclipse官方�|�站的RCP开发指南。原文地址为：(x��) http://www.eclipse.org/articles/Article-RCP-1/tutorial1.html

�W�一�ơ翻译，有错误，�Ƣ迎指正�?/font>

Rich Client Tutorial Part 1

The Rich Client Platform (RCP) is an exciting new way to build Java applications that can compete with native applications on any platform. This tutorial is designed to get you started building RCP applications quickly. It has been updated for Eclipse 3.1.2

RCP java rcp Eclipse 3.1.2 Introduction

Try this experiment: Show Eclipse to some friends or co-workers who haven't seen it before and ask them to guess what language it is written in. Chances are, they'll guess VB, C++, or C#, because those languages are used most often for high quality client side applications. Then watch the look on their faces when you tell them it was created in Java, especially if they are Java programmers.

Because of its unique open source license, you can use the technologies that went into Eclipse to create your own commercial quality programs. Before version 3.0, this was possible but difficult, especially when you wanted to heavily customize the menus, layouts, and other user interface elements. That was because the "IDE-ness" of Eclipse was hard-wired into it. Version 3.0 introduced the Rich Client Platform (RCP), which is basically a refactoring of the fundamental parts of Eclipse's UI, allowing it to be used for non-IDE applications. Version 3.1 updated RCP with new capabilities, and, most importantly, new tooling support to make it easier to create than before.

If you want to cut to the chase and look at the code for this part you can find it in the accompanying zip file . Otherwise, let's take a look at how to construct an RCP application.

Eclipse Eclipse VB C++ C# java java

Eclipse 开放源代码许可的，你可以用 Eclipse 3.0 Eclipse IDE 3.0 Eclipse RCP Eclipse UI Eclipse UI Eclipse IDE 3.1 Eclipse RCP RCP

Rich Client Tutorial Part 1 accompanying zip file RCP

Getting started

RCP applications are based on the familiar Eclipse plug-in architecture, (if it's not familiar to you, see the references section). Therefore, you'll need to create a plug-in to be your main program. Eclipse's Plug-in Development Environment (PDE) provides a number of wizards and editors that take some of the drudgery out of the process. PDE is included with the Eclipse SDK download so that is the package you should be using. Here are the steps you should follow to get started.

RCP Eclipse Eclipse PDE PDE Eclipse SDK PDE

First, bring up Eclipse and select File > New > Project, then expand Plug-in Development and double-click Plug-in Project to bring up the Plug-in Project wizard. On the subsequent pages, enter a Project name such as org.eclipse.ui.tutorials.rcp.part1, indicate you want a Java project, select the version of Eclipse you're targeting (at least 3.1), and enable the option to Create an OSGi bundle manifest. Then click Next >.

Eclipse �Q�选择File > New > Project�?/strong>接下来选中 Plug-in Development�Q?/strong>双击来打开插�g工程向导。在弹出的页面中�Q�键入工�E�名�Q�例如：(x��) org.eclipse.ui.tutorials.rcp.part1�Q�，指明你要一�?/span> java工程�Q�选择你想创徏适用�?/span> Eclise的版本，�q��中使用 OSGI包。接下来点击 Next> �?/span>

note�Q?/b>Beginning in Eclipse 3.1 you will get best results by using the OSGi bundle manifest. In contrast to previous versions, this is now the default.

In the next page of the Wizard you can change the Plug-in ID and other parameters. Of particular importance is the question, "Would you like to create a rich client application?". Select Yes. The generated plug-in class is optional but for this example just leave all the other options at their default values. Click Next > to continue.

通过使用 Eclipse 3.1 OSGI OSGi
ID 号和其他参数。尤其要��x(ch��ng)��一个问题：(x��)“你惌��创徏一个富客户端的应用�E�序吗？”，选择“是”。生成的插�g�c�L��可选的�Q�但对于�q�个例子�Q�一切其他的可选项都设为默认倹{��单�?strong>Next >��C��一��?strong>�?/strong>

note�Q?/b> If you get a dialog asking if Eclipse can switch to the Plug-in Development Perspective click Remember my decision and select Yes (this is optional).

Eclipse Starting with Eclipse 3.1, several templates have been provided to make creating an RCP application a breeze. We'll use the simplest one available and see how it works. Make sure the option to Create a plug-in using one of the templates is enabled, then select the Hello RCP template. This is RCP's equivalent of "Hello, world". Click Finish to accept all the defaults and generate the project (see Figure 1). Eclipse will open the Plug-in Manifest Editor. The Plug-in Manifest editor puts a friendly face on the various configuration files that control your RCP application.

Eclipse 3.1 RCP Hello RCP RCP Hello, world Eclipse

Figure 1. The Hello World RCP project was created by a PDE wizard.

燕然 2006-06-30 18:27 发表评论