站内搜索: 请输入搜索关键词

当前页面: 开发资料首页Eclipse 专题Eclipse3.0的swt编程

Eclipse3.0的swt编程

摘要: Eclipse3.0的swt编程
一、swt简介 Java语言的声望和它在桌面应用程序(GUI程序)所取得的成就显然极不相符,至今仍然很少能看到非常成功Java桌面程序。虽然有JBuilder,Netbean,JProbe等大型软件作为代表,但这仍不能证明Java的GUI程序是成功的:它们的外观总是和同一操作系统平台下的其它软件显得格格不入。对机器配置的需求也似乎永无止境,这使得它们只能被一些总是拥有当前最高性能PC的程序员们所容忍,或是那些不在乎金钱和时间的专业用户所接受。对绝大多数计算机使用者来说,AWT或SWING代表着怪异的界面和无法接受的速度。Standard Widget Toolkit(SWT)或许是Java这一噩梦的终结者,广大Java程序员终于可以开发出高效率的GUI程序,它们拥有标准的外观,几乎没有人能看出你的程序是用Java写出来的,更为重要的是,这些程序是跨平台的。

  SWT本身仅仅是Eclipse组织为了开发Eclipse IDE环境所编写的一组底层图形界面 API。或许是无心插柳,或是有意为之,至今为止,SWT无论是在性能和外观上,都超越了SUN公司提供的AWT和SWING。目前Eclipse IDE已经开发到了2.1版本,SWT已经十分稳定。这里指的稳定应该包含两层意思:

  一是指性能上的稳定,其中的关键是源于SWT的设计理念。SWT最大化了操作系统的图形构件API,就是说只要操作系统提供了相应图形的构件,那么SWT只是简单应用JNI技术调用它们,只有那些操作系统中不提供的构件,SWT才自己去做一个模拟的实现。可以看出SWT的性能上的稳定大多时候取决于相应操作系统图形构件的稳定性。

  另一个稳定是指SWT API包中的类、方法的名称和结构已经少有改变,程序员不用担心由于Eclipse组织开发进度很快(Eclipse IDE每天都会有一个Nightly版本的发布),而导致自己的程序代码变化过大。从一个版本的SWT更新至另一版本,通常只需要简单将SWT包换掉就可以了。二、Eclipse3.0的swt编程1.swt比awt和swing要快多,因为它是利用操作系统的界面组件生成UI的,在java桌面设计领域掀起一场革命2.环境配置: windows系统+eclipse3.03.具体操作:(1).新建一java项目,命名swt,文件结构如下: +swt +bin(编译输出) +src(原文件) +AddressBookUI.java +swt-awt-win32-3062.dll(以下均从eclipse\plugins\org.eclipse.swt.win32_3.0.1\os\win32\x86下导入) +swt-win32-3062.dll +javaw.exe.manifest(2).到项目的properties里,在java build path | libraries里将swt.jar导入(3).AddressBookUI.java原代码如下:import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;public class AddressBookUI { private Shell shell;
private Text miscText;
private Text addrText;
private Text emailText;
private Text phoneText;
private Text lnameText;
private Text fnameText;
private Button cancelButton;
private Button saveButton;
private Button nextButton;
private Button prevButton;
private Button editButton;
private Button deleteButton;
private Button newButton;
public static void main(String[] args) {
AddressBookUI window = new AddressBookUI();
window.open();
}
public void open() {
final Display display = new Display();
shell = new Shell();
shell.setSize(610, 477);
shell.setText("Address Book");
{
newButton = new Button(shell, SWT.NONE);
newButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
clearText();
setTextEditable(true);
enableEditButtons(false);
enableSaveButtons(true);

System.out.println("New button selected.");
}
});
newButton.setBounds(10, 380, 75, 35);
newButton.setText("New");
}
{
deleteButton = new Button(shell, SWT.NONE);
deleteButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
clearText();

System.out.println("Delete button selected.");
}
});
deleteButton.setBounds(85, 380, 75, 35);
deleteButton.setText("Delete");
}
{
editButton = new Button(shell, SWT.NONE);
editButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
setTextEditable(true);
enableEditButtons(false);
enableSaveButtons(true);

System.out.println("Edit button selected.");
}
});
editButton.setBounds(160, 380, 75, 35);
editButton.setText("Edit");
}
{
prevButton = new Button(shell, SWT.NONE);
prevButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
System.out.println("Previous button selected.");
}
});
prevButton.setBounds(265, 380, 75, 35);
prevButton.setText("Previous");
}
{
nextButton = new Button(shell, SWT.NONE);
nextButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
System.out.println("Next button selected.");
}
});
nextButton.setBounds(340, 380, 75, 35);
nextButton.setText("Next");
}
{
saveButton = new Button(shell, SWT.NONE);
saveButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
setTextEditable(false);
enableEditButtons(true);
enableSaveButtons(false);

System.out.println("Save button selected.");
}
});
saveButton.setBounds(445, 380, 75, 35);
saveButton.setText("Save");
saveButton.setEnabled(false);
}
{
cancelButton = new Button(shell, SWT.NONE);
cancelButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
setTextEditable(false);
enableEditButtons(true);
enableSaveButtons(false);

System.out.println("Cancel button selected.");
}
});
cancelButton.setBounds(520, 380, 75, 35);
cancelButton.setText("Cancel");
cancelButton.setEnabled(false);
}
{
final Group group = new Group(shell, SWT.NONE);
group.setText("Details");
group.setBounds(10, 10, 585, 355);
{
final Label label = new Label(group, SWT.NONE);
label.setBounds(10, 20, 135, 25);
label.setText("First Name:");
}
{
final Label label = new Label(group, SWT.NONE);
label.setBounds(10, 60, 135, 25);
label.setText("Last Name:");
}
{
final Label label = new Label(group, SWT.NONE);
label.setBounds(10, 100, 135, 25);
label.setText("Phone:");
}
{
final Label label = new Label(group, SWT.NONE);
label.setBounds(10, 140, 135, 25);
label.setText("Email:");
}
{
final Label label = new Label(group, SWT.NONE);
label.setBounds(10, 180, 135, 25);
label.setText("Address:");
}
{
final Label label = new Label(group, SWT.NONE);
label.setBounds(10, 255, 135, 25);
label.setText("Miscellaneous Information:");
}
{
fnameText = new Text(group, SWT.BORDER | SWT.READ_ONLY);
fnameText.setBounds(150, 15, 420, 25);
}
{
lnameText = new Text(group, SWT.BORDER | SWT.READ_ONLY);
lnameText.setBounds(150, 55, 420, 25);
}
{
phoneText = new Text(group, SWT.BORDER | SWT.READ_ONLY);
phoneText.setBounds(150, 95, 420, 25);
}
{
emailText = new Text(group, SWT.BORDER | SWT.READ_ONLY);
emailText.setBounds(150, 135, 420, 25);
}
{
addrText = new Text(group, SWT.BORDER | SWT.READ_ONLY | SWT.V_SCROLL);
addrText.setBounds(150, 175, 420, 60);
}
{
miscText = new Text(group, SWT.BORDER | SWT.READ_ONLY | SWT.V_SCROLL);
miscText.setBounds(150, 250, 420, 65);
}
}

setupMenu();

shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
}

private void setupMenu() {
//create the menu bar
Menu menu = new Menu(shell, SWT.BAR);
shell.setMenuBar(menu); //add the File option to it
MenuItem file = new MenuItem(menu, SWT.CASCADE);
file.setText("File"); //create a menu for the File option
file.setMenu(new Menu(file)); //add MenuItems to the File menu
MenuItem prevItem = new MenuItem(new Menu(file), SWT.NONE);
prevItem.setText("Previous");

MenuItem nextItem = new MenuItem(new Menu(file), SWT.PUSH);
nextItem.setText("Next");

MenuItem seperator = new MenuItem(new Menu(file), SWT.SEPARATOR); MenuItem quitItem = new MenuItem(new Menu(file), SWT.PUSH);
quitItem.setText("Quit"); //add listeners for the actions
prevItem.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
System.out.println("Previous menu item selected.");
}
}); nextItem.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
System.out.println("Next menu item selected.");
}
}); quitItem.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
shell.dispose();
}
});
}

private void clearText() {
fnameText.setText("");
lnameText.setText("");
phoneText.setText("");
emailText.setText("");
addrText.setText("");
miscText.setText("");
}

private void setTextEditable(boolean editable) {
fnameText.setEditable(editable);
lnameText.setEditable(editable);
phoneText.setEditable(editable);
emailText.setEditable(editable);
addrText.setEditable(editable);
miscText.setEditable(editable);
}

private void enableEditButtons(boolean enable) {
newButton.setEnabled(enable);
deleteButton.setEnabled(enable);
editButton.setEnabled(enable);
}

private void enableSaveButtons(boolean enable) {
saveButton.setEnabled(enable);
cancelButton.setEnabled(enable);
}
} (4).测试运行,run就可以啦终于写完了,HOHO~~,你可以到http://www.java2s.com寻找关于swt的好的程序

↑返回目录
前一篇: Eclipse基础--plugin插件安装
后一篇: GEF,EMF,RCP,Eclipse's plugin的几个问题(3) 让eclipse的properies view实现disabled效果